US2508896A - Demountable time switch unit for universal use - Google Patents

Description

May 23, 1950 R. D. SMITH 2,508,896

DEMOUNTABLE TIME SWITCH UNIT FOR UNIVERSAL USE INI/fNToR May 23, 1950 R. D. SMITH 2,508,896

' DEMOUNTABLE TIME swITcE UNIT EOE UNIVERSAL UsE Filed June 20, 1945 5 Sheets-Sheet 2 j 60 /2/ /9l 0l/23 J9 //7 /ef LIIIHIII IN VEN TOR May 23, 1950 R. D. SMITH 2,508,896

DEMOUNTABLE TIME SWITCH UNIT FOR UNIVERSAL USE Filed June 20, 1945 3 Sheets-Sheet 3 INVENTOR Patented.- May 23, .11950 Y .l

UNITED STATES PATENT oEEicE DEMOUNTABLE TIME SWITCH UNIT FOR UNIVERSAL USE Raymond D. Smith, Easton, Conn.

Application June 20, 1945, Serial No. 600,557

25 Claims. 1

'I'his invention relates to time switches combined with r incorporated within a time-of-day telling clock and particularly to electric circuitmaking-and-breaking mechanism operated or governed by clockwork.

Time switches of this type commonly consist of a, time giving mechanism or time movement mechanically so associated with circuit switching electric contacts that such contacts are caused automatically to make and break one or more electric circuits at preset times of day. In such time switches where the same clock-work not only operates or governs an electric switch but also drives conventional clock hands in front of a conventional clock face for telling time of day, it has been proposed in my former U. S. Patents Nos. 2,004,137 and 2,032,774 to provide separate indicators adjustably settable around the circularly arranged regular time-of-day markings on the clock face for registering thereby the time of day at which the circuit making and breaking actions automatically will take place. Mechanically, such indicators may be connected with the switch operating mechanism so as to assume registering positions with respect to the clock face indicia that shall accord accurately with the setting of. inside trips or any other kind of working elements which determine at what point in the running of the clock movement the automatic electric switch actions shall be caused to take place.

The present invention aims to incorporate such distinctive kind of switch action, time indicator means as are proposed in my former said patents in a novelly organized form of appliance that may be characterized as a demountable armored unit having distinct and important advantages over previously known kinds of time switches. This novel structural form of combined clock and time switch unit opens the way to radical departure from long established but costly and inefficient practices of manufacturing and merchandizing time switches for many elds of use. Examples of such use are: the time control of cooking in electric and gas ranges; timed automatic turnon and turn-off of radio receiving sets for catching desired broadcasting programs; the automatic shifting of temperature setting in house heating controls at regular preset' times between lowered night heat and normal daytime heat; the timed automatic defrosting of electric refrigerators on a regular daily schedule; the automatic turning on and off of store window display lights, bill board' and outdoor advertising lights, as well as the illumination of public quarters automatically at preset times of day or night.

'Ihe present improvements aim to solve these former problems by providing a small, unitary, armor-encased time switch incorporating a timeof-day telling clock with its crystal protected clock face, which shall be attachable in readily demountable manner in iiush relation to a sight apertured panel or other form of upright support wall.

Other objects oi' the present invention have to do with structural and functional improvements in an organization of working parts based on principles originating in my aforesaid issued patents. Among such are devices that permit back-setting as well as forward setting of certain electric switch time setting controls and indicators; devices which change the program of automatic circuit switching action irom a twelve hour cycle to a twenty-four hour cycle, controls additional to the electric switch setting controls exposed for manipulation at the front of the unit for actuating the clock-work as for restarting a non-self starting synchronous clock motor when its interrupted supply of current is resumed or resetting the clock hands to a correct time of day, devices to stay the time setting indicators and controls against unintentional displacement from their set positions, and devices to enable a timeswitch of the character concerned to switch current automatically from one circuit to another.

The foregoing and other objects of the invention are more fully referred to in the following description of a preferred embodiment of the invention in which description reference is had to the appended drawings wherein:

Fig. 1 is a front view oi' mv improved clock switch unit mounted on a vertical panel, a part of which is shown as broken awav to expose more of the unit than in practice would appear.

Fig, 2 is a view looking from the right at Fig. 1, some of the parts being shown as taken in section on the planes 2--2 in Fig. l, a different thickness of support panel being indicated at the top than is indicated at the bottom for purposes oi' illustration.

Fig. 3 shows a useful application oi' the unit of Figs. 1 and 2, wherein the same is mounted against the inner face of a hinged cover giving access to a cabinet containing a magnetically operated switch, in the upper part of which cabinet there is room to accommodate the clock switch unit when the cover of the cabinet is swung closed. IieXible electric wires connecting the clock switch unit and themagnetic switch while permitting the cabinet cover to be opened and closed.

Fig. 4 shows a portion of the mechanism in Fig. 2 drawn on a larger scale more clearly to illustrate modified details of construction.

Fig. 5 shows on a scale similar to Fig. 4 a still further modification of gearingv construction for changing the ratio through which the circuit controller is rotated.

Fig. 6. on a correspondingly enlarged scale, shows a modification of the time setting manual of Fig. 2 whereby this manual becomes selfbraked to remain stationary without being hold while the other manual is being adjusted. Fig. 6 further shows separately movable handles on concentric spindles for independently actuating the switch mechanism and the clockwork.

Fig. 'l is a partial view of the clock motor as viewed from the left looking at Fig. 1 with the cover oi' the unit shown in section and serving to mount an agitating mechanism for starting in motion the clock movement.

Fig. 8 is a rear view of the agitating mechanism of Fig. '7 as same appears when looking from the left at Fig. '7.

Fig. 9 is a front view oi a modied construction of the clock switch unit wherein the clock face and hands are only fragmentally shown and the time setting discs of the switch are modified and cut away to indicate their interleaved relationship.

Fig. l0 is a view of the modified construction taken in section on planes III- I0 in Fig. 9 looking in the direction o1 the arrows.

Fig. 11 is a detail view in perspective showing one of the circuit controlling discs.

Fig. 12 is a similar view showing the other circuit controlling disc.

Fig. 13 is a similar view of an insulative facing for the disc of Fig. 1l.

Fig. 14 correspondingly shows an insulative facing for the disc oi' Fig. 12.

Fig. 15 is a sectional fragmentary View taken on the plane I5-I 5 in Fig. 9 to show the relationship of the interleaved discs of Figs. 11 to 14, inclusive, at their point of circuit switching action.

Fig. 16 is a view similar to Fig. 15 taken on the plane Ill-I6 in Fig. 9 showing the relationship of the discs at their other point of circuit switching action.

For the purposes of constructing my improved clock switch as a self-contained, unitary device, I provide a framework including a partition or main frame plate III having a large circular aperture through which, and beyond both faces of which. extends a diametrically large thinwalled hanged bearing eyelet II. A ring gear I2 is retained by one flange of this large bearing eyelet against the front surface of frame plate III, and a similar ring gear I3 is retained by the other flange oi' the same eyelet against the rear face of frame plate Il). Ring gears I2 and I3 are thus supported for independent rotation on opposite sides of the frame plate I0. There will occur to those skilled in the art obvious equivalents for this particular construction which will permit gears I2 and I3 to be correspondingly disposed and operative.

I may construct a support means for the switch and time tellingr parts in the form of a base plate slab I4 of insulative material firmly attached to and spaced rearward from frame plate I0 by the support brackets I5. Bearing structure which helps to support the circuit switching and time telling parts may include a tubular rigid bushing I6 threaded at its rear end to receive a front clamp nut I1 and a rear clamp nut I8 which nuts 4 when set up against the respectively opposite sides ofbase plate I4 serve to hold the bushing IS in rigid perpendicular relation thereto and projecting forward therefrom concentrically with the ring gears I2 and I3 asbest shown in Fig. 4.

Members fixedly carried by the stationary bushing I6, in their order from back to front, comprise as also clearly shown in Fig. 4, a large thin insulative washer I9, the insulative collar 20, another large insulative washer 2 I, and a third clamp nut 22 having threaded engagement with the forward end of bushing I6 and serving to thrust the washers I8 and 2|, together with the insulative collar 20 axially backward and tighten them fixedly against the clamp nut I1 so that all .these parts are in effect made rigid with the. bearing bushing I6. Further parts iixedly supported upon the bushing I6 comprise the internally threaded, insulative collar 23 which has threaded engagement with the front end of bushing IE and projects forward from the front end thereof and at its own front end receives and insulates from electrical contact with bushing I6 a retaining screw 24 the enlarged head of which clamps a clock face dial 25, backed by an insulative facing 26, against the forward end of insulative collar 23 whereby the clock dial is supported -concentrically with the ring gears I2 and I3.

Dial 25 is representative of any circuitousscale of time-of-day markings stationed in relation to frame plate I0. The retaining screw 24 may be recessed as shown in Fig. 4 to reduce the axial length of its central hole that serves as a steadying bearing for the rotary spindles for the clock hands later to be described.

The prime mover of my improved assembly of clockwork may incorporate any kind of spring driven movement or electrically powered reduction gear train capable of running at a constant speed for time keeping purposes. The movement herein shown includes an electric motor1 preferably of the synchronous type, that is inherently capable of keeping in step with the time characteristics of an alternating current. One example of this type of motor is disclosed in United States Patent No. 1,864,108. The only description thereof necessary to be given herein is that its framework may comprise a front frame plate 21 mounted on, and spaced from, base plate I4 by posts |61 together with an intermediate plate 28 connected in spaced relation to plate' 21 by posts 29, and a rear plate 30 connected to and spaced from intermediate plate 28 by posts 3|. The rear frame plate 30 of the time giving train or movement may be formed and made of material suitable to constitute the magnetic or field stator for motor armature 32, iield stator plate 20 being energized for this purpose by an alternating current coil 33 wound about a laminated bar 34, magnetically contacting said plate. A train of reduction gears may provide operating connection between the armature pinion 35 and another pinion 36 fast to the spindle 31 that extends through the stationary bushing I6 and at the front end thereof carries a clock hand 38 swingable about an axis transversely of which frame plate I0 extends. The same spindle 31 may extend rearward from pinion 36 through the movement plates 28 and 30 to be manually turned for setting the clock hand by means of a button which may detachably engage a squared terminus of spindle 31 and itself be rotatably mounted in the rear wall of the rear section 46 of the casing structure.

In some constructions of the clock switch unit I prefer so to arrange the movement gearing that spindle 31 and hand 38 shall rotate at a speed of one revolution in one hour thus to serve as the socalled "minute hand of-an ordinary clock. In other constructions I prefer to arrange the movement train to impel directly a pinion 39 fast to the spindle 40 and extending through spindle 31 (made hollow for this purpose) to carry at its forward end the sweep hand 4|, which parts are shown in broken lines in Figs. 1 and 4. Spindle 40 and hand 4| may then be driven at a speed f one revolution in one minute to serve as the so-called second hand of an ordinary clock and, by its greater and therefore visible speed, to inform an observer whether the clock is running or has stopped. In the case of using spindle 40 and hand 4|, pinion 36 may derive its movement by being fixed to minute spindle 31, the latter carrying gear 42 also llxed thereto and impelled from pinion 39 by the reducing idler gears 43 and 44 whose common spindle 44 is of course rotatably supported in bearing plates 21 and 28 of the clock movement.

Whether or not the sweep hand 4|, its spindle 40 and the gears 42, 43 and 44 are employed, the "minute" spindle 31 may be surrounded by the usual hollow spindle 41 carrying the hour hand 48 between the minute hand 38 and the clock dial 25. Hollow spindle 41 will be rotated at the usual speed of one revolution in twelve hours by means of the gear 49 iixed on its rear end because gear 49 is driven from pinion 36 in the ratio of 1 to 12 by' the idler reduction gears 50, 5|, the former of which is at the front of movement plate 21 while the latter is at the rear of said movement plate, both of said idler gears 50 and 5| being ilxed to turn in unison on a common spindle not shown but projecting through and having bearing in the movement 4plate 21. As the hour spindle 41 is given rotary bearing support in the screw 24 and as the minute spindle 31 is given rotary bearing in the movement plate 21, and as spindles 41 and 31 (as well as 40 when used) rotate in telescoped relationship, it will be plain that they are adequately supported for free rotation at their respectively different speeds without tendency to bind even if variations occur in the assembled relationship of the stationary sup-k porting parts extending between the bearing screw 24 and the movement plate 21.

The clock controlled circuit maker and breaker of my improved construction is similar in nature to that disclosed in my aforesaid U. S. Patent No. 2,004,137 and includes a current distributor in the form of helically disposed contact wiper 52, preferably of resilient conductive material, ilxed to rotate in unison with a metallic hub 53 to which is also xeclY the gear 54 preferably made of insulative material. Hub 53 is freely rotatable about the stationary insulative collar 2l between the insulative washers |9 and 2| and contains a peripheral groove 55 constantly contacted conductively by the resilient current carrying brush I mounted on the insulative base I4 by screw 51.

The contact wiper 52 is thereby constantly supplied with current through the brush 56 while rotatively impelled by suitable transmission gearing driving the insulative gear 54 and driven by the time movement, or any part motivated thereby, in a manner to travel in unison with some one of the three clock hands 33, 3| or 43,' or at some predetermined speed ratio in relation thereto. For convenience of illustration I have not'shown the contact wiper gear 54 as driven from the time movement through a train separate from that peripheral edge of each which impels the time telling clock hands but inthereon and I have shown an idler gear 55 inv mesh with the insulative contact wiper driving gear 54 at the front of the switch base |4 and connected to turn in unison with the idler gear 56 at the rear of said base which gear 60 is in mesh with gear 56. Thus the contact wiper 52 may be rotated, say, pinions 59 and 60 are equal to each other in diameter and gears 54 and 58 are equal to each other in diameter, or, if preferred, at half the speed thereof, as would be the case with the relative sizes oi' gears 54. 59, 60 and 55. that are shown in Fig. 4.

The means which determine the time at which a circuit shall be made or broken by the clock impelled contact wiper 52 include switch action controlling elements in the form of interleaved and relatively adjustable discs or rings for the most part similar to those described in detail in my aforesaid Patent No. 2,004,137 wherein a. split disc 6| of conductive material is interslideably adjustable in helically interleaved relationship to a split disc 62 of insulative material, both oi these discs being carried upon a central hub 63 which may comprise a thin walled bearing eyelet between whose rear head and said discs is assembled a cupped spring washer 64 to insure good electrical conductance between disc 6| and hub 63. The two discs 6| and 62 with their hub 63 thereby comprise a unitary rotatable structure adjustably turnable about the insulative collar 23 back of the clock dial 25 and insulated therefrom by the facing 26. Suitable disc stationing friction is imparted to the discs 6| and 62 by their mutually acting broadside pressure against each other aided by the spring 65 which exerts an axially expansive thrust between the disc hub 63 and the clamp nut 22 heretofore described. Spring 65 is thus part of the means of electrical contact between the conductive disc 6| and a binding post 66 secured to the switch base |4 by a screw 61 which is placed in electrical connection with the clamp nut |1 by a radial conductive strap or buss bar 68 clamped between nut |1 and the base plate I4.

All parts have now been described which enable the contacting with, and separation from, switch action controlling elements 6| and 62 of wiper 52 respectively to make and break a circuit extending from the lead-in wire 69 to the lead-out wire 10 through the following conductive parts: strap 68, nut I1, bushing |6, nut` 22, spring 55. hub 63, washer 64, conductive disc 6|-wiper 52, hub 53, brush 56, and screw 51, all of the above conductive parts being separated from all other metallic parts of the mechanism or frame by parts composed of insulation as hereinbefore described.

In my U. S. Patent No. 2,004,137 means for engaging the discs 6| and 62 for shifting their relative rotative adjustment as well as their absolute rotary positions are provided consisting of axially disposed insulative projections or studs attached respectively to the discs. Fig. 2 herein (as well as Figs. 11 and 12) show a construction of these discs wherein no propelling stud or the like is attached thereto but wherein the material of the discs themselves is extended at suitable points to project in suitable directions from the disc to be engaged by suitable propelling shoulders carried by ring gears I2 and I3, respectively, for manually effecting selective rotative adjustments oi each disc while in unison with the hour hand 4l ifthe conductive disc 8l is thus precluded from conductive contact with any metallic parts of the unit 'other than those designed to complete an electric circuit as herelnbeiore described.

The radial projection 1I extending from the peripheral edge of insulative disc 82 contains an opening which may be engaged by a forwardly extending pin 12 carried by the front ring gear I2 whereby pin 12 can propel insulative disc 62 in either rotary direction, while the backward extension 13 oi a tongue-like continuation of the sheet material of conductive disc 8| occupies a notch in an lnsulative impelling lug 14 carried by the rear ring gear I3 whereby lug 14 can propel the conductive disc 6I in either rotary direction. The turning of each of discs 62 and 8| relative to the other, as adjusted respectively by the turning ofring gears |2 and I3, is preferably limited to substantially one complete circle of relative movement by any suitable means such as stops which might co-act between the ring gears I2 and I3. For this purpose the large bearing eyelet II on which these ring gears are mounted might be arranged to turn ilxedly with one of said gears and be turnable relatively to the other gear only to an extent that is limited by the said stops arranged to act between the eyelet Illand the ring gear which turns relative thereto. A fuller explanation of the details of construction and operation of these discs and their stop limited relative movement is contained in my Patent No. 2,004,137 where corresponding parts are identified by corresponding reference numerals.

The ring gears I2 and I3 are manually adjusted respectively by separate spur gears 11 and 18, these spur gears being on respectively opposite sides of an apron-like extension 19 of the otherwise circular main frame plate I8 on which each o1' said spur gears is pivotally mounted. Said spur gears carry respectively forwardly projecting operating spindles 80 and 8I turnable by manuals in the form of finger knobs 82 and 83 whereby gears 11 and 18 may be rotated manually together or separately. A click such as shown at 84 in Fig. 1 limits the permissible degree of backward turning of each of gears 11 and 18 for the purpose of preventing make and break of the circuit between contact wiper 52 and the conductive disc 6I other than with a snap action.

The protective and dust proof enclosing structure which houses the clockwork assembly hereinbefore referred to includes a bezel ring 85 holding a clock face crystal 86. A mat ring 81 borders an annular space around the edge of the clock dial 25 in which annular space time setting arcuate signal charts in the form of curved bands oi the contrasting distinctive colors of discs 6I and 82 are visible as shown in Fig. l, thereby to indicate by the arcuate length and circular positions of said curved color bands the portions of the full cycle of time represented by the complete circle of the clock face during which the clock controlled circuit will remain made or will remain broken. Conventional clock face graduations on the clock dial 25 may serve to measure and indicate the hours and fractions of hours represented by the relative and absolute positioning of the contrasting visible arcuate signal charts determined by the circular positioning of discs 6| and 82, but if preferred I may render the measurement and indication of elapsed time represented by the extent o1' these color bands even more readily and exactly discernible by adding to the visible portion of discs and 62 themselves indicia quantitatively expressing diierent time intervals as illustrated in the case of one disc in Fig. 1 where the graduations 88 serve to measure and indicate the number of hours and fraction or hours represented bythe arcuate extent of the exposed portion of disc 8|. Corresponding graduations could of course be applied to the other disc. To accord with the gear ratio of 1 to 2 indicated between the hour hand spindle I1 and the contact wiper 52, I may graduate the mat ring or alternative clock face 81 to represent a division of the complete circle into 24 hours arranging the markings to make evident that twelve oi' these hours are hours of the day, and that the other twelve are hours of the night. In such case the graduatlons on the clock dial 2l will be referred to only for telling the time oi day and the graduations on the mat ring 81 will be Areferred to for telling what time of day or night the automatic circuit switching action will take place. Obviously I might add graduations to the clock face 25 for 2li-hour divisions of a complete circle in place of placing such graduations on the mat ring 81.

As part oi an enclosing structure I may provide the dustproof protective casing I6 with a iiange portion 89 which may be clamped iirmly to the main frame plate I0 by the same nuts 98 and spacer studs 9| which hold the bezel ring 85, the casing 46 being notched and slotted as indicated in Fig. 2 to form a narrow opening into its int'erior just back of plate I0 to permit entrance thereto of the gear 18 for meshing respectively with ring gears I2 and I3. Studs 9| and thereby the entire appliance may be held firmly and removably on any supporting structure such as the closure panel 92, 93 or 96 by means of preferably three or more screws |88.

Studs 9| and nuts 98 are capable of supporting and holding firmly together with or without the presence of the enclosing'structure comprising parts 46, 85 and 88, the partitions I0 and Il. My improved clock controlled switch appliance comprises an integral structure whether assembled as an exposed unit without protective cover 46 or as a completely housed operative mechanism, and it likewise comprises an integral structure together with all the above described protective parts. When thus applied as a unit it is adapted to be rigidly mounted at the rear of a sight aperture 9 against the rear surface of a thin metal support wall or panel as 92, or against a thick wooden support wall or panel as 98, in either of which cases the clock crystal 88 may lie substantially flush with the front tace of such wall or panel. The length of studs 9| may be chosen to this end and such wall or panel will contain openings through which the time setting spindles 8| and 80 project. Knobs such as 88 and 82 may be detachably secured respectively to spindles 8| and 89, these knobs being the only working parts required to be removed in mounting or dismounting the entire clock switch unit from the wall or panel of any appliance or machine to which the unit is applied. It is further apparent that in some cases the knobs 82 and 83 can be made so small in comparison with the openings for spindles and 8| that even these knobs could be withdrawn through said openings without requiring their removal.

Illustrative of a useful application of the complete clock switch unit of Figs. 1 and 2, I show this unit in Fig. 3 mounted upon the inside surface of a sheet metal door 98 hinged to a cabinet 91 by brackets 98 and hinge pins 99, the cabinet 91 containing a remote control, or electromagnetic, switch commonly termed a relay. The remote .control switch comprises an insulative'base |00 on which is mounted electric arc-bemmg shields |I| at the point where contact is made and broken between a line terminal |02 and its corresponding load terminal |03 and simultaneously between a second line terminal |04 and its corresponding load terminal |05, the action of this` contact making and breaking mechanism being effected by the rocker core |06 of an electromagnetic coil |01 mounted upon a common squared rocker shaft |09 to swing therewith in unisonwith the contact arms |09 and ||0. The core |00 is withdrawn from magnet coil |01 by gravity, or by suitable spring means (not shown) and upon energization of magnet coil |01 is drawn within same to rock the contact arms |09 and in unison to contact making position. Terminals for the magnet coil |01 are shown at and ||2, respectively, and the electrical connection of the three wires 69. 10 and 95 to the supply line and to the magnet coil |01 will be clear from' Fig. 3. Here these three wires are shown as leaving the cover 4i of the clock switch unit through the insulative bushing ||3 and detachably secured respectively to three binding posts on the insulative block I4 to each of which binding posts are respectively secured individually insulated wires of flexible nature which permit the opening and closing of the door 96 relative to cabinet 91. By the means just described, wire 59 connects electrically to both the right line terminal |04 and the magnet coil terminal wire 10 connects electrically with the other terminal ||2 of the magnet coil |01; and wire 95 connects to the left line terminal |02. By these connections -the magnet coil |01 of the remote control switch is energized an'd de-energized by the circuit controlling action of contact wiper 52 in the clock operated switch unit, while the motor coil 33 of the timing movement is constantly energized through permanent connection to the line terminals |02 and |04 of the electromagnetic switch. It will be understood that when the cabinet door 96 is closed the clock face dial 25 and time setting discs 5| and 52, as well as the time setting kcontrols 82 and 03, are all accessible or visible from the exterior of cabinet 91 in the manner shown in Figs. 1 and 2. There is room in the upper portion of cabinet 91 to receive the clock switch unit when the door 95 is closed,

the flexible wires being suitably secured by clips ||5 at different points properly to hold these wires from interference with any of the working parts of the mechanism. From the foregoing description it will be appreciated that it is a very easy matter to remove the clock operated switch unit completely from-the cabinet of the remote control switch in the case of needed attention or repairs to the clock or the switch unit. This can easily be done by inexperienced mechanics in the field who without expert repair experience will thus be able to replace a defective time switch unit with a sparev or replacement unit that is in good operating condition without appreciable interruption of use of the relay.

As in some uses it is desirable to have the contact wiper 52 travel at the same rate of speed, or in strict unison with, the hour hand 40 of the clock while in other uses it is preferred that contact wiper 52 travel at half that speed thus consuming 24 hours in making one revolution, economies of manufacture and commercial distribution can be effected by providing a gearing arrangement for driving contact wiper 52 which will be shiftable at will to produce either one of accesso the above mentioned speeds. A peculiar requirement of such arrangement is that the wiper 52 must always so rotate as to coincide with the position of hour hand 4l at its point of circuit breaking action when the hour hand is at some Adefinite and predetermined point in its travel.

Usually this will be when the hour hand points to 12 where as is shown in Fig. 1, the cardinal "12 of a stationary 24-hour series of graduations coincides in its position on the circle with cardinal 12 on the time telling clock face. In such case therefore, whether the wiper 52 rotates in sychronism with thehour hand, or completes one revolution to everytwo revolutions of the hour hand, it will always be necessary that when the contact wiper 52 (or its operating tip which snaps from one to the other of discs 5|, 52) is at exactly top center position in Fig. l, the hour hand shall point exactly to twelve oclock, and no change in this condition must be broughtabout through the act of shifting the speed at which contact wiper 52 shall be impelled, since the same condition must obtain if the wiper 52 is to bc geared to travel at a speed equal to that of the hour hand or only half as fast.

With `these particular requirements in mind, I have shown in Fig. 5 a modification of the construction of the idler gears 59 and 60 wherein an idler spindle ||5 is given bearing of appreciable length in a bushing structure ||1 which extends through the switch base I4 and is fast thereto. Spindle ||9 carries fixed pinion 59 at its forward end as in Fig. 4 but at its rear end is provided with a shoulder I9, a round portion ||9 of reduced diameter, and a rear squared terminus |20 threaded internally from its rear end. A pinion |2| of the same size as pinion 59 may turn loosely on spindle H9, or be clamped to rotate ixedly therewith. by means of a bushing |22 slidably fitted to the squared terminus |20 of spindle ||6 and overhanging the same to receive the tightening thrust of the head of a screw |23 engaging the threaded hole in the rear of spindle |16. Leaving screw |23 tight or loose will de- 4r/ termine whether pinion |2| is fast or loose respectively in relation to spindle H0. Pinion |2| is in mesh with an additional gear |24 which turns xedly with the hour hand spindle 41' and is of the same diameter as the contact wiper gear 54 so that when pinion |2| is fast to spindle ||0 the contact wiper 52 will rotate at the same speed as an hour hand 49. In this modiilcation I give the rear idler gear v60 (which is simllar'in size to the idler gear 60 of Fig. 4 and is in mesh with the same hour spindle gear 58) a loose or tight connection on the clamp bushing |22 depending on whether a clamp nut |24 is set up tightly or loosely on the threaded exterior of bushing |22 by means of which gear 00 may be forced forward against the front shoulder on said bushing to be made fast thereto. Obviously, the above described mechanism would lock and be inoperative if both the screw |23 and the clamp nut |24 are tightened at the same time, but ii'I one alone is tightened and if in shifting the gear ratio the other is tightened before the rst is loosened, no

relative movement will have taken place between the hour spindle 41' and the contact wiper 52 as a consequence of having shifted the effective drive connection of contact wiper 52 from gear |2| to gear 5|. or vice versa. Accordingly it will be appreciated that if the clock hands are set to exactly twelve oclock when the shift in gear ratio is made. the wiper 52 will not be thrown out of accurate rotative relationship to the clock loutside the protective cover 48.

ll hands with respect to its performing circuit switching automatic action at the true times of day or night indicated by the settings of the discs 8| and 62 against their designed scales of graduations.

The timing movement energized by the coil 33 may be a synchronous motor of the self starting type or of the non self starting type. In the latter case, for convenience in restarting the motor should it stop from current interruption, I may employ a spinning device best shown in Fig. 'I consisting of a starter spindle |25 journaled in the movement plates and carrying fixed to turn therewith between plates 28 and 21 a flanged member |26 which carries secured in its flange and -disposed parallel to its axis, the starter pin |21 connected by the spring |28 to the movement post 29. The starter pin |21 as carried with the flanged member |26 swings in an arcuate opening in the movement plate 21 the ends of which opening limit the swinging travel of pin |21 in both directions, the spring |28 normally stationing the pin |21 in contact with one end of said opening and out of contact with the armature gear |29. On turning the spindle |25 clockwise as viewed in Fig. 8 to the limit of movement permitted by the travel of pin |21 in its arcuate slot, the rear end of pin |21 isswept into engagement with teeth of the armature gear |29 so that when suddenly released by the hand of the operator the pin |21 is snapped back to its normal or starting position thus imparting a spin to the armature gear |29 through the rapidity of the spring caused action. The speed thus imparted to armature gear |29 is preferably as great as, or greater than, its normal running speed so that the armature 32 may by this starting movement slow down into exact step with its designed ratio of speed in relation to the oscillations of alternating current in the coil 33.

In Figs. 2 and 3 1 show the starter spindle |35 manually operable by a simple crank handle |38 In Figs. 6, '1 and 8, I show the crank handle |30 replaced by an arm |30' carrying the pin I3I to be engaged by the forked end of a rocker lever |32 pivoted at I 33 to a bracket |34 which is secured to the 'rear face of the protective cover 46. The bracket |34 gives sliding bearing to a push rod |35 carrying a cone shaped actuator |36 at its rear end adapted to act upon the lower offset end of rocker lever |32 for displacing the latter when the actuator |36 is thrust toward the rear, the broken lines in Fig. 8 indicating the positions to which arm |30' and rocker lever |32 will thereby be movedagainst the tension of spring |21. Whereas the push rod |35 may extend to any accessible position for use by the operator of the clock switch unit, I have shown in Fig. 6 that it may extend forwardly through the shaft 80' or 8|, made hollow for this purpose, thereby to permit the operative association of push rod |35 with either of the time setting knobs as 83', the rod |35 terminating in a push button |31 forced yieldably forward relative to knob 83 by the thrust of spring |38 whereby the starting of the electric motor is reliably accomplished by pushing the push button |31 inward and releasing it suddenly so that it will snap outward.

Fig. 6 further shows a modified construction applicable to one or both of the gears 11 and 18 which mesh with ring gears |2 and I3, respectively, for adjusting the times of circuit controling switch action. In this modification the spindle 89 is made with a round portion |39 `lournaled in the frame plate III and flanked at each side of said frame plate by squared portions III. On each of these squared portions there is carried a similar gear 11 securedAby a thrust nut I4I engaging threaded portions of spindle 88'. Between the front gear 11 and the frame plate I0, a cupped spring washer |42 acts to thrust spindle 89 and all parts carried thereby, forwardly, there being a slight space to permit a little rearward movement of these parts against the tension of washer |42. Between the rear gear 11' and the frame plate I0 is a washer |43 of friction material affording yieldable resistance to the turning of the rear gear 11 with which it has considerable area of surface contact. This arrangement affords what in eect is a self-braking or self-staying action of each spindle 88 or 8| and consequently of ring gears I2 or I3. The frictional resistance of washer |43 is conveniently annulled or overcome by the forces that would be imparted to knobs 82' or 83' by the hand of the user in the natural manner of operating same. Hence in this construction either of discs 8| or 62 will remain stationary while the other is shifted relative thereto without requiring simultaneous grasping and manipulation of both time setting knobs in order to prevent either disc 6I or 62 from turning with the other.

In Figs. 9 to 16, inclusive, I show a modification of certain parts of my improved clock switch unit, such modification as concerning the ring gears I2 and I3, enabling me to lead the current to and from the time controlled switching parts by current feeding or current take-oil brushes wiping on conductive parts carried on said gears. As concerning the circuit controlling discs 6I and 62, themselves, the modification illustrated in Figs. 9 to i6 enables a universal time setting to be made in accordance with the principles disclosed in my Patent 2,004,137, where instead of only one conductive disc, there are two or more relatively adjustable discs both of conductive material and completely insulated from each other in every possible relative position as Well as from the frame and from all metal operating mechanism of the entire clock switch unit except the contact wiper 52. This wiper in its circuit controlling rotation will be transferred with a snap action from one of these conductive discs to the other, and vice versa, being in no rotary position able to contact both of said discs at the same time. This enables the use of the time controlled switch for shifting current automatically from one circuit to a different circuit,

and back again at respectively predetermined times, instead of for merely making and breaking a single circuit.

In Figs. 9 and l0 .the ring gear |44 rotatively adjustable by gear 11 (not shown in Figs. 9 and l0) is made of insulating material and disposed against the front face of frame plate I0 as is the ring gear I2 of Fig. 2. A similar ring gear |45 of insulative material and adjustable by gear 18 (not shown in Figs. 9 and l0) is disposed against the rear face of frame plate I0 in the manner of ring gear I3 of Fig. 2. Embedded, inlaid, or otherwise suitably secured to the front face of ring gear |44 is a collector ring |48 of conductive material on which constantly bears the conductive brush |41 which is in electrical contact with binding post |48 mounted on and insulated from the main frame plate I0 and adapted to receive the wire |49 leading to one electric circuit. Correspondingly attached to the rear face of ring gear |45 is a collector ring Il.

accesos on which constantly bears the conductive brush |5| which is in electrical contact with binding post |52 mounted on an insulated from main frame plate I and adapted to receive the wire |55' leading to a different electric circuit.

Collector ring |45 carries the conductive pin |54 for propelling the projection of a disc similar to disc 62 of Fig. 4 but made oi conductive material. This conductive disc is numbered 82' (see Fig. 11) and because of the uncertain electrical contact that would result from mechanical looseness between pin |54 and the opening in projection 1|' engaged by same, and because such mechanical looseness isdesirable for compensating for any inaccuracy in the exact concentric relationship of the parts that turn in unison as well as to permit slight axial sliding movement between pin |54 and projection 1|', a flexible conductive strap or connector |55 may be soldered or otherwise suitably secured to insure good electrical connection between pin |54 and projection 1|' while accommodating slight relative movement therebetween. Collector ring Ill carries the conductive bracket 14' so disposed as to straddle and impel the projection Il of conductive disc 6| in the same manner as insulative bracket 14 in Fig. 2, but because in Figs.

9 to 16 it is desired that good electrical contact shall exist between bracket 'il' and the disc projection 1I, a ilexible stra.: |55 may be employed and attached for this purpose in the manner of the connector |55.

vTo maintain the discs and 62'of Figs. 12 and 11 always insulated from each other in every possible rotative relation. I may insulate the front, or visible, face of disc 5| by enameling the same or in any other suitable way such as by joining xedly to the said face of disc 6| a thin disc of insulation preferably of slightly larger diameter than disc 6| such as the disc |51 of Fig. 14 having the notch 1G beyond which in a forward direction, the stop lug '|5 may project. In a similar manner I may enamel or otherwise insulate the front or visible face of disc 52' in Fig. 11 such as by cementing or otherwise securely fastening to said face of disc 62 a conflgurati've disc of insulating material such as |59 inFig. 13, same being of slightly larger diameter than disc 62' and carrying the notch 'I5' to coact as a stop with the -lug .'15 on disc 5|. which latter is kept from contact with the metal of disc 52' by a larger notch |5|| in the latter disc. Also to prevent projection v'i3 from coming into electrical contact with projection 1|' when these two projections would otherwise engage and act as a limiting stop in the opposite direction of rela.

tive movement from that direction in which the relative movement is checkedby lug 15 and the edge of notch 18', I may provide disc |59 with the peripheral projection |6| in such relationship to projection as will operate to this end.

In the relationship of the parts detailed in Figs. 11 to 14 that is indicated in Fig. 9, the contact wiper 52" in its clockwise rotative movement as impelled by the time movement will snap from its :Sull line position to its broken line position in Fi". 15 thus shifting the flow of current supplied through line wire 10, from disc 6| to disc 52', that is to say from the circuit lead wire |49 to the lead wire |53 of a diiferent circuit.

Likewise in the next circuit shifting action of wiper 52, the latter will snap from its full line position to its broken line position in Fig. 16, thus shifting the supply of current delivered by line wire 15, from disc 62' to disc 6|, that is to say,

from circuit lead wire |53 to circuit lead wire III. It is thus seen how the modiiied clock switch oi' Figs. 9 to 16. inclusive, functions as a so-called double-throw switch instead of as an ordinary "On and Oii' switch. This doublethrow feature is commonly applicable to remota control electric switches, gas. valves or other devices reciprocated between two positions by the use of two magnets as indicated in Pig. 33 of the drawings of my United States patent. Number 1,984,204, granted December 11, 1934.

It will be noted from Fig. 10 how the take-oi! of current from the commutator rings I" and enables me to dispense with a compound support structure such as the conductive bushing l5, insulative collar 20, and insulative extension 23 of Fig. 4 and substitute therefor the singlepiece insulative bushing |62 as a support for the clock face and for the parts which rotate concentrically therewith. I may also dispense with the hub eyelet 53 of Fig. 4 and arrange the discs 5| and 52 to bear rotatably on a simple insulative collar |63 between insulative washers |54 at their front and at their rear.` The retaining nut |55 having threaded engagement with the frontend of insulative bushing |52 (used in place of the screw 24 of Fig. v4)may clamp the clock face or dial 25 directly against the front end of insulative collar |53. The friction spring 55 of Fig.`4 may also thus be omitted.

I claim: 1. A time telling electric circuit controlling appliance adapted to be detachably mounted as an exchangeable unit on a support wall, proximate a sight aperture therein, embodying in combination with a clock face, clockwork including a time-of-day telling clock hand cooperative with said clock face rotatable about an axis in position to be observed through said sight aperture, en-

closing structure housing said clockwork, framewithin said enclosing structure and containing a frame hole, a ring-like time setting device bordering said frame hole and carried by said partition in a manner to be rotatably adjustable about said axis while positioned to be observed through said sight `aperture,` and electric current switching mechanism controllably related to said clockwork and deriving its support from said framework without the instrumentality of said enclosing structure including a contact member arranged to be settable adiustably around said axis by rotary movement of said time setting device.

2. A time telling electric circuit controlling appliance as defined in claim 1, together with a second ring-like time setting device carried by the said partition in a manner to be rotatably adjustable about the said axis relatively both to said partition and to the rst said ring-like time setting device.

3. A time-telling electric circuit controlling appliance as defined in claim 1, together with a second ring-like time setting device carried by the said partition in a manner to be rotatably adjustabale about the said axis relatively both to 4. A time telling electric circuit controlling appliance as defined in claim 1, together with a second ring-like time setting device on the opposite side of the said partition from the first said ring-like time setting device, and an eyeletshaped annulus shaped and arranged cooperatively with said time setting devices and occupying the saidframe hole in said partition in a manner to afford axially retentive internal rotary bearing support for both of said ring-like time setting devices.

5. A time telling electric circuit controlling appliance as defined in claim 1, in which the said time setting device comprises a time setting ring on one side of the said partition having spur gear teeth, together with a time setting ring on the other side of said partition having spur gear teeth, and separate ring actuating pinions pivotally supported at respectively opposite sides of said partition in mesh with ythe gear teeth of said time setting rings respectively.

6. A time telling electric circuit controlling appliance as defined in claim 1, in which the said enclosing structure is mainly cylindrical and the said partition comprises a flat plate having a circular area coextensive with the compass of said enclosing structure and extending radially in outboard relation therebeyond, and the said time setting device comprises a time setting ring on one side of said partition plate having spur gear teeth, together with a ring actuating pinion pivotally supported on the said side of said partition plate outside the compass of said enclosing structure in mesh with the gear teeth of said time set- 51118 ring.

7. A time telling electric circuit controlling appliance adapted to be detachably mounted as an exchangeable unit on a support wall proximate a sight aperture therein, embodying in combination with a clock face, a clockwork including a time-of-day telling clock hand cooperative with said clock face rotatable about an axis in position to be observed through said sight aperture, enclosing structure housing said clockwork including a transparent protecive covering in front of said clock hand registering with said sight aperture, framework supporting said clockwork witnoutthe instrumentality of said enclosing structure including a partition to which at least part of said enclosing structure is detachably joined equipped to derive full support from said wall without the instrumentality of said enclosing structure said partition being directed crosswise of said axis within said enclosing structure and containing a frame hole, a ring-like time setting device bordering said frame hole and carried by said partition in a manner-to be rotatably adjustable about said axis while positioned to be observed through said sight aperture, and electric current switching mechanism controllably related to said clockwork and deriving its support from said framework without the instrumentality of said enclosing structure including a contact member arranged to be settable adjustably around said axis by rotary movement of said time setting device.

8. A time telling electric circuit controlling appliance as defined in claim '7, in which the said enclosing structure comprises two cupped sections joined in rim-to-rim relation, one of said sections including the said transparent protective covering.

9. A time telling electric circuit controlling appliance as defined in claim 7, in which the said enclosing structure comprises two cupped sections' joined in rim-to-rim relation, and the said partition has a marginal portion fixedly sandwiched between said cupped sections 10. A time telling electric circuit controlling appliance as defined in claim 7, in which the said enclosing structure comprises two cupped sections disposed in rim-to-rim relation, each of said sections having a radially outward directed flange at its rim, said rim flanges being fastened separably together, and means penetrating said rim flanges for demountably attaching said enclosing structure to the said support wall at points bordering about the said sight aperture therein.

11. In a settable double-throw time switch for shifting current flow from one circuit to a difierent circuit the combination of a circuitous scale of time designating indicia, terminals of two electric circuits, a first cross-split ring of composite conductive and non-conductive united materials having a front face of non-conductive material in register with said indicia and a rear face of conductive material electrically connected with one of said terminals, a second cross-split ring of composite conductive and non-conductive united materials having a front face of non-conductive material in register with said indicia and a rear face of conductive material electrically connected with the other of said terminals, means rotatably supporting said rings so that at least one ring may flex to a helical form and so that each ring may be rotated through the split portion of the other ring thereby to dispose varying extents of its circular lengths on respectively different sides of the other ring, and a rotatable electric distributor mounted to wipe against the rear faces of said rings sequentially for delivering current to either of said circuit terminals.

i2. In a settable time switch the combination defined in claim l1, together with two setting rings of insulating material supported for rotary adjustive movement coaxially with the said crosssplit rings, each of said setting rings carrying a circular conductive track electrically and mechanically coupled to the said conductive material of a different one of said cross-split rings, and a current conductive brush disposed to wipe against each of said conductive tracks.

13. In timing mechanism, the combination of, a clockworks, a stationary clock face, a spindle driven by said clockworks, a clock hand carried by said spindle to sweep in front of said clock face, indicia on said clock face including an index mark, electric switch controlling mechanism including a rotor coaxial with said spindle, and a variable speed transmission comprising two sets of constantly meshing gears connected to impart alternatively to said rotor motion derived from said clockworks,

14. In timing mechanism, the combination defined in claim 13, in which the said variable speed transmission includes two pairs of change gears with the gears of each of said pairs constantly in mesh, and means to clutch one of the gears of either of said pairs to the said clockwork and simultaneously to declutch one of the gears of the other of said pairs from the said rotor in a manner to vary the speed ratio between said elockworks and rotor without displacing said rotor from its relation to said index mark.

l5. In a multiple scale time indicating mechanism, a time movement, two scales of time indicia arranged in concentric circles and designating respectively different intervals of time corresponding to equal segmental portions of said concentric circles, at least one signal device movable in a path to register with both of said scales of i structed and arranged to be settable in accordance with the position of said signal along said path and a movable part cooperative with said stationary part, together with speed changing mechanism comprising two sets of constantly meshing gears connected to transmit impelling power alternatively from said movement to said movable part of said switch controlling mechanism.

16. In a combined clock and time switch unit, the combination of, electric switch control mechanism, clockwork objectively associated with said mechanism Aincluding motor driven time telling hands, separately movable handles connected respectively to actuate said mechanism and said clockwork, and coaxial spindles separately and independently movable operatively connecting said handles to said mechanism and said clockwork respectively at least one of said spindles being movable in an axial direction for actuating said clockwork.

17. The combination of a switch cabinet, a door having a sight aperture hinged to said cabinet in a manner to swing to a position completing closure for the interiorof the cabinet, an electromagnetic circuit controller of relatively high electrical capacity within Isaid cabinet including a contact actuating solenoid, a time switch unit of relatively low electrical capacity carried detachably by said door on the cabinet side of said sight aperture and registering with the latter, and electrical conductors connecting said solenoid to said time switch unit constructed and arranged to permit said door to swing to and away from its said closure completing position.

18. In a settable time switch, the combination of, a scale of circularly arranged time designating indicia, a first cross-split ring, a second cross'- split ring, means rotatably supporting said rings so that atleast one ring may flex to a helical form and so that ring may be rotated adjustably through the split portion of the other ring, electric switch controlling means including a time driven element and an adjustably settable stationary member cooperative therewith, signal means registering with said indicia and adjustably settable in accordance with various stationary positions of said member, separate manuals connected respectively to rotate said rings adjustably, and yieldable brake means automatically operative to resist the rotary adjustment of at least one of said rings thereby to retain the said one ring while the other ring is rotated adjustably by its said manual.

19. In a concentric clockwork and time switch mechanism, a frame plate for supporting both clockwork and time switch mechanism, a hollow post perpendicular to and rigid with said plate, a threaded tube of insulating material xedly carried at the free end of said posts, a nut having threaded engagement with said tube and insulated thereby from vsaid post. a clock hand, a clock face removably retained on said tube by said nut, a clock spindle extending through both said post and said tube and journaled in said nut carrying a clock hand in front of said clock face, and electrically conductive current switching parts between said frame plate and said clock 18 face rotatably supported in part by said post and in part by said tube.

20. A time telling electric circuit controlling appliance adapted to be detachably mounted as an exchangeable unit on a support wall proximate a sight aperture therein, embodying in combination with a clock face, clockwork including a time-of-day telling clock hand cooperative with said clock face rotatable about an axis in position to be observed through said' sight aperture, enclosing structure housing said clockwork, framework including a main partition to which at least part o1' said enclosing structure is detachably joined equipped to derive full support from said wall without the instrumentality of said enclosing structure said partition being directed crosswise of said axis within said enclosing structure and containing a frame hole, an auxiliary partition supporting said clockwork also extending crosswise said axis deriving full support from said main partition without the instrumentality of said enclosing structure, a hollow bearing post concentric with said axis xed on and projecting from said auxiliary partition and carrying said clock face, spindle connections extending through said hollow post and through said auxiliary partition impellably connected to said clock hand, a ring-like time setting device bordering said frame hole and carried by said main partition in a manner to be rotatably adjustable about said axis while positioned to be observed through said sight aperture, and electric current switching mechanism controllably related to said clockwork deriving its support from said bearing post without the instrumentality of said enclosing structure including a contact member arranged to be adjustably settable around said axis by rotary movement of said time setting device.

21. In a combined clock and time switch unit completely settable by the use of a single hand of the operator to perform at least two automatic switch actions at selected different times of day, the combination of, a framework, a circuitous scale of time-of-day markings stationed in relation to said framework, a first arcuate signal chart mounted for rotary adjustive movement relatively to said framework through a range of various settings in visible time signaling relation to said scale, a second arcuate signal chart mounted concentrically with said rst chart for rotary adjustive movement through a range of various settings relatively to both said first chart and said frame work in cooperative time-signaling register therewith, switch action controlling elements operably connected to said charts respectively in a manner to be stationed variously in different switch timing positions with respect to each other and to said framework in accordance with rotary settings of said charts, separate manuals connected to adjust said charts selectively to their said settings, and a brake arranged cooperatively with at least one of said charts and its said manual in a manner to anchor `the same yieldably in relation to said frame with sumcient force to hold said one of said charts and its said connected switch controlling element motionless during rotary adjustive movement oi' the other said chart within its said range.

22. In a combined clock and time switch unit I completely settable by the use of a single hand of the operator to perform at least two automatic switch actions at selected different times oiday, the combination defined in claim 21, in-which the said brake comprises a spring deriving thrust from the said frame plate and exerting a frica,sos,soo

tional thrust on at least one of the said manuals.

23. In a combined clock and time switch unit completely settable by the use of a single hand of the operator to perform at least two automatic switch actions at selected different times of day, the combination denned in claim 21l together with a set of meshing gears turnably supported by the said frame plate, one of said gears being connected to impart adjustive rotary movement to one of the said signal charts and the other of said gears being connected to be impelled by one of the said manuals, the said brake cornprising a spring under compression between said frame plate and said manual impelled gear.

24. 'In a combined clock and time switch unit completely settable without regard to sequence by the use of a single hand of the operator to perform at least two automatic switch actions at selected different times of day, the combination of a framework, a circuitous scale of timeof day markings stationed in relation to said framework, at least two arcuate signal charts one being mounted for rotary adjustive movement through a range of various settings relatively to the other and to said framework in visible time signaling relation to said scale, and the other chart being mounted concentrically with said first chart for rotary adjustive movement through a range of various settings relatively to both said rst chart and said frame work in cooperative time-signaling register therewith, switch action controlling elements operably connected to said charts respectively in 'a manner to be stationed variously in different switch timing positions with respect to each other and to said framework in accordance with rotary settings of said charts, separate manuals connected to adjust said charts selectively to their said settings, and a brake arranged cooperatively with each of said charts and its said manual in a manner to anchor the same yieldably in relation to said frame with sufficient force to hold either of said charts and its said connected switch con- 20 trolling element motionless during rotary adjustive movement o! the other said chart within its said range.

25. In an automatically acting time switch, the combination of a clock hand turnable about an axis of rotation to tell time of day, a frame plate extending transversely of said axis of rotation, a closure panel in front of said frame plate spaced therefrom, a sight window in said closure panel through which said clock hand is visible, concentric arcuate time signaling charts independently movable for cooperative rotary adjustment in mutual register so that one of said charts conceals and exposes various selective portions of the other of said charts, said charts deriving support from said frame plate and being visible through said window, sets of gears deriving support from said frame plate each of said sets of gears being connected to cause independent rotary adjustment of a different one of said charts, at least one of said sets of gears being located between said frame plate and said closure panel and concealed by the latter, and manual controls operatively connected respectively to gears of said sets and extending through said closure panel to be accessible for time setting manipulation at the front of the latter.

RAYMOND D. SMITH.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,180,420 Parker Apr, 25, 1916 1,563,072 Brenneman Nov. 24, 1925 1,633,870 Potter June 28, 1927 2,004,137 Smith June 11, 1935 2,032,774 Smith Mar. 3, 1936 2,124,045 Swensen July 19, 1938 2,249,237 Fulton July 15, 1941 2,288,539 Morrison June 30, 1942

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