US2344767A - Control device - Google Patents

Description

March 21, 1944. DlLLMAN 2,344,767

CONTROL DEVICE Filed Oct. 9, 1942 2 Sheets-Sheet 1 5 p 6 9 20 c I 1 INVENTOR *QAMW MM LL ATTORNEY March 21, 1944.

FIGS

1 I mvFmogz n2 )4 BY n. M

" 4;, ATTORNEY Patented Mar. 21, 1944 CONTROL DEVICE Earnest J. Dillman, Detroit, Mich., assignor to Detroit Lubricator Company, Detroit, Mich., a corporation of Michigan Application October 9, 1942, Serial No. 461,487

21 Claims.

This invention relates to new and useful improvements in control devices and more particularly to an operating mechanism for actuating controlling elements, its adjustment and the support of the same.

An object of the invention is the provision of novel mechanism for the actuation of elements to be controlled thereby, and which is of simple and efficiently operating construction.

Another object is the provision of novel means for adjusting the mechanism.

Another object is to provide novel supporting means for a control mechanism and for positioning the same in cooperative relation with an actuating means.

The invention consists-in the improved construction and combination of parts to be more fully described hereinafter and the novelty of which will be particularly pointed out and distinctly claimed. V

In the accompanying drawings to be taken as a part of this specification, there are fully and clearly illustrated several preferred embodiments of the invention, in which drawings:

Figure l is a View in front elevation of a control device having its cover member removed to show the internal construction;

Fig. 2 is a view similar to Fig. 1 but having the control mechanism removed to show the actuating means therefor and certain adjusting means;

Fig. 3 is a view in side elevation and partly in vertical section on the line 3--3 of Fig. 1 to show the adjusting and actuating means of Fig. 2;

Fig. 4 is a portional view in side elevation looking from left to right facing Fig. 1 and showing a cover member in section and in place;

Fig. is an enlarged detail sectional view of the control mechanism taken on the line 5-5 of Fig. 4;

Fig. 6 is a detail plan view in section on the line 6--6 of Fig. 5;

Fig. '7 is a view in front elevation and partiy in vertical section showing another form of control device embodying the invention, and

Fig. 8 is a detail view in section on the line 8-8 of Fig. '7.

Referring to the drawings, and particularly Figs. 1 to 6, by characters of reference, the numeral I designates generally a supporting structure such as a housing or casing having a rear wall 2 and forwardly extending top and bottom walls 3, 4 respectively. Through the rear wall 2, adjacent the bottom wall 4, there is an aperture 5 concentric with and in a rearward extending rear wall recess 6. Secured to the. rear wall 2 at the recessed wall portion by tongue and groove construction, for example, and extending rearward therefrom concentric with aperture 5, there is a tubular supporting member I. Journaled in and extending through the aperture 5, there is a ubular sleeve bearing member 8 which has a bearing portion 9 adjacent its rear end which rotatably fits within the member I. The sleeve member 8 has an extension I0 projecting beyond the member 1 and to which there is secured, as at i I, one end of a helical bimetal wall or thermostatic actuating means I2 concentric with the sleeve member 8. Adjacent its forward end the member 8 has an annular shoulder I3 which abuts the rear face of the wall 2 to limit movement of the member 8 into the casing. J ournaled on the end portion of member 8 within the casing there is a plate member I4 providing anv adjustment lever member. The lever member I4 is held axially in place on the member 8 and against the wall 2 and the shoulder I3 is held against the Wall 2 v by means of a plate member I5 secured rigidly on the end of member 8 within the casing. The lever member l4 and the plate member I5 are provided below the member 8 with forward extending opposed flanges IS, I! respectively which are adjustably spaced and held fixed with respect to each other by an adjustment screw I8 and compression spring I9 so that rotation of lever member I4 will rotate the sleeve member 8. Extending through the sleeve member 8 and journaled therein adj acent the forward end thereof, there is a rotatable operating shaft 20 which extends through the wall !2 and has its rear end secured, as at 2|, to the free end of the coil so that the coil end I I being fixed, expansion and counteraction of the coil l2 Will rotate the shaft 20. The coil I2 is housed within a heat transmitting tubular cover member 2 i which slidably fits over the tubular member I and is secured in position by a set screw 2|". The casing I is preferably supported by the cover member 2 I a which is screw threaded, as at 2 I for threaded engagement in a supporting aperture of a furnace or duct wall, for example. Secured rigi ly on the end of shaft 20 within the casing, there is an operating means 22 having a radially extending operating arm or member 23 having at its free end a forward plate like extension 24 to which is secured a plate pressure member 25 of electric insulating material, see Fig. 4.

The plate member l4 extends radially upward from the bearing member 8 and is offset rear- :wardly, as at 21, to pass through an arcuate opening 28 in the rear wall 2. At the sides of the offset portion 21 there are wing portions 29 which overlie and close in cooperation with the member l4, the opening 28. The offset lever portion provides an upward extending adjustment arm 30 which, at its upper end, is rebent forwardly to provide a downward directed pointer or indicator finger 3| which overlies the front face of a dial plate 32 having indicia thereon designating degrees Fahrenheit, for example. The'dial plate 32 is secured as by screws 33 to the rear face of wall 2 and extends upwardly therefrom above the top wall 3. A supporting rod or bar 34 is secured to the rear face of dial plate 32 by the screws 33 and overlies the arm 39 to support the same. A clamping screw 35 is threaded through the rebent lever portion above the dial plate 32 and serves to clamp the adjustment lever arm 30 frictionally to the dial plate 32 to hold the plate member M in adjusted position so that the bimetal coil end I I will be held in fixed position.

Secured to the bottom wall 4 within the casing there is a forward extending angle bracket 36 having an upstanding flange 31 positioned at one side of the longitudinal axis of the shaft 2'']. Through the top wall 3 there are rectangular apertures 38 which overlie the bracket 36 and have their inward faces or edges alined vertically with the outer face of the flange 31. Fitting in the apertures 28 there are upward extending fingers or projections 39 of a plate supportin member 46 of electric insulating material which, at its lower end, laterally abuts the Outer face of flange 31, so that the supporting member 40 lies in a plane parallel to the longitudinal axis of shaft 20, the member 40 being removably secured to the flange 31 by screws 4|. Secured, as by riveting, to the outer face of the supporting member 49 and insulated from each other thereby, there are metal bracket'members 42, 43. The member 42 is in the form of an angle bracket having its flange 44 secured against the member 40 and having its flange 45 extending across the front edge of the supporting member 49 and lying substantially parallel to the rear wall 2. Bent up from the side edges of the rear wall 2, there are apertured ears 46 to receive clamping screws 41 for looking or holding the generally U-shaped cover member 43 in closing relation with the rear wall 2 and the top and bottom walls 3, 4. The bracket member 43 is of U-shaped form having one leg 49 clamped to the outer face of member 40 with its base extending across the rear edg of member 46 and having its other leg 50 extending forwardly substantially parallel to and spaced from the supporting member 46. On the flange 44 and the leg 49, there are terminal members or binding posts 5|, 52 respectively. At the lower end of the flange 45 there is a rearward extending horizontal flange or hinge supporting member 53 which is spaced laterally from the supporting member 40. Secured to the underface of the flange 53 by an angle supporting plate 54, there is a sheet material hinge member 55 having an upward extending flange to which the lower end of a control element carrying a lever member 56 is riveted or otherwise tightly secured. The plate 54 ha an upturned flange 51 inclined toward the hinge member and with its top edge substantially in the plane of the bottom edge of the lever member 56 so that it forms a bearing point for flexing of the upward extending hinge member flange. Projecting from the lever member 56 and preferably bent out of the same, there is abracket portion 58 substantially midway the length of the lever member and having a supporting surface portion 59 converging toward the free end of the lever member edging. Seating on the surface portion 59, there is a control element carrying leaf spring 60 preferably of cadmium copper which is bent intermediate its ends, as at 6|, so that its upper end portion 62 lies along the lever member 56. The spring end portion 62 extends upward through an aperture 63 in a lateral arm 54 projecting from and preferably bent out of the lever member 56 and extending away from the supporting member 49 in overlying relation to the bracket portion 58. On the upper end of the spring portion 62, there is a switch contact control element 65 having a rounded contact face. The lever member 56 terminates at its upper end in a magnetic member or armature 66 which. extends above the contact element 65. Also seating on the inclined bracket portion 59 there is a resilient positioning member 61 which is spaced from the spring '66 by a metal pad 68 and which is bent, as at 69, to extend upward substantially parallel to the upper leaf spring portion 62. T he positioning member 61 is apertured at its upper end, as at 16, to receive the reduced end portion 1| of the armature 64, which portion extends through the aperture 16 and serves as a stop member. The reduced portion H provides shoulders 12 facing away from the supporting member 46 and against which the positioning member 61 abuts. The positioning member 61 is preferably of spring tempered bronze so that it exerts a greater resistance to bending 0r flexing than the leaf spring 60 and has, at its upper end, a lateral end flange 13 which overlies the arm aperture 63 and engages the leaf spring portion 62. The leaf spring 60, when the lever member 56 is moved toward the supporting member 40 from the position shown and with the posi tioning member 61 retracted, Will move by its inherent force away from the lever member 56 and substantially into engagement with the opposing edge of arm aperture 63 so that when the positioning member 69 is released to engage the shoulders 12, the leaf spring 60 will be stressed or flexed toward the lever member 56 so that it is held away from the opposing edge of arm armature 63 by the lateral end flange 13 unless the spring 66 is additionally stressed away from th end flange 13 as shown and as will be described. Overlying the bracket portion 49 and seating on the positioning member 61, there is an abutment member 14 which is bent to lie substantially parallel to the positioning member 61 and has a conical abutment portion 15 extending away from the lever member 56 and which is positioned for moving engagement by the pressure plate member 25 of the shaft operated member 22. Secured as by riveting to the inner face of the supporting member 46 adjacent the inner flange 53, there is a supporting arm 16 extending upward between the lever member 59 and the supporting member 40 and having a longitudinally extending opening 11 therethrough underlying and through which the upper end portion of the lever member 56 can pass. The supporting arm 16 is bent outwardly away from the supporting member 40, as at 19, so that it diverges upwardly with respect to the member 49 and is inherently stressed or tensioned to move away from the member 40. The supporting arm 16 has longitudinally extending reinforcing side flanges 19 and has, at its upper end. a rebent downward facing U-shaped portion 80. Secured in its downturned end of the rebent portion 86, as by solder, there is a U-shaped perment 65.

manent magnet 8| having its poles directed downward and straddling or embracing the upper end portion of the control element 65 and leaf spring. The magnet 8| has its side which faces the sup- The bracket member leg 50 has an adjust ment screw 82 alined with the rebent supporting arm portion and carries an abutment pin 83 of electric insulating material which abuts against the downturned supporting arm end to hold the magnet 8| in adjusted position and the supporting arm 16 against its inherent force tending to move it away from the supporting member 40. Also supported in the leg 56 there is an adjustable fixed switch contact control ele ment 84 having a flat contact face for engagement by the rounded face of the control ele- Alined with the lateral stop arm 84 and engageable by its stop member II, there is .a stop member 85 projecting from the leg 50 toward the supporting member 40. The fixed element for contact member 84 is adjusted so that "when the stop arm II is in engagement with the stop member 85, the leaf spring portion 82 will be flexed away from the end flange 13 under a force such that when the elements 65 and 84 are out of engagement, the leaf spring portion 82 will be held stressed by its abutting engagement with the end flange 13. Therefore, the leaf spring 60 is tensioned at the time the control element 65 engages the control element 84 so as to substantially eliminate any tendency of the control element 65 to bounce or vibrate upon its engagement with the fixed control element 84. The differential of operation of engagement and disengagement of control elements 65 and 84 is determined by adjustment of the magnet 8| by means of the adjustment screw 82 relative to the armature 66 when stop arm II is in engagement with stop member 85, it being understood, however, that an air gap will be maintained between the magnetic members 8| and 66. In the position of the parts as shown, the temperature of the thermostatic actuator I2 is below the temperature setting of say 175 F.

adjusted by lever arm 30 and, therefore, the switch contact members 65 and 84 are in engagement and the operating arm 22 is away from the lever member abutment I5. As the temperature affecting the actuator I2 increases, the arm 22 will move clockwise facing Fig. 5 until the apex end portion of the pressure member 25 engages the abutment 15. A slight further temperature increase will now be required in order to bring up a sufficient force to overcome the whole force of the magnet BI and when this additional pressure against the lever member 56 is reached, the armature 66 will move away from the magnet 8| with a quick action, as is well understood in the art, so that the contact member 65 with slight lost motion until it engages the end flange 13, will then be quickly moved out of engagement with the fixed contact member 84. The force of the thermostatic actuator I2, when the contact members are separated, will be suflicient to move the armature 66 through the magnet supporting arm aperture 11 and into stopping engagement with the supporting member 40. Upon temperature decrease from the open contact position described, the pressure member 25 will move counterclockwise facing Fig. 5 and lever member 58 will follow with it under the traction of magnet 8|, the leaf spring 60 being in tensioned engagement with the end flange I3. When the lever member 58 has moved toward the magnet 8| sufficiently so that the magnetic attraction is greater than the holding force of the thermostatic actuator I2, then the armature 66 will be pulled quickly to the position shown in Fig. 5 at which it is limited by stop arm 'II engaging stop member 85. During this quick movement, the contact member 65 will engage the contact member 94 and, due to the offset and bent construction of the leaf spring 60 and its initial tension, the contact member 65 will have a sliding, rolling engagement with the contact member 84, thereby maintaining and assuring clean and smooth engagin surfaces,

Referring to Figs. 7 and 8, the invention is shown as embodied in a dual control device in which the operating shaft I00, rotated by a thermostatic bimetal actuator such as shown and adjusted as in Fig. 3 is journaled in the rear wall ml of a casing I02 having forward extending top and bottom walls I03, I04. The thermostatic actuator and its adjustment as noted is similar to that of Figs. 1 to 6 and, therefore, it is believed unnecessary to repeat the illustration of the same, similar parts being designated by the primes of the reference characters applied to Figs. 1 to 6. Secured on the end of shaft I00 within the casing I02, there are adjustable cam operating members I05, I06 of electric insulating material which are adjustable relative to each other by a slot and clamping screw I01, the cam members being locked in adjusted position on the shaft I00 by a lock nut I08. Spaced substantially equidistant and laterally of the shaft I00 and extending between the walls I03, I04 there are supporting members I09, 0 of electric insulating material fixed in position by end fingers I II entering wall slots and by angle brackets ||2, as in Figs. 1 to 6. Referring to member I09 it has, secured to its outer face, bracket members I I3, I I4 substantially similar to the bracket members 42 and 43 respectively of Figs. 1 to 6 and respectively overlyin the front and rear edges of the supporting member I09 and similarly secured thereto. The bracket member III! has a terminal member or binding post I I5 and a horizontal lever member supporting fiange H6 located similarly to flange 53. The bracket membar 4 has a binding post or terminal member II! and a bracket arm 8 positioned in parallel relation to the supporting member I09 similarly to the bracket arm 50. Clamped to the flange III; by a hinge plate member II9 for a backing flange IZI, there is a sheet material hinge plate I20. Extending from the ends and under face of the member I I9, there are spaced bearing arms I22 which lie substantially parallel to the rear wall IN and away from the supporting member I09. Journaled between the arms I22 on a bearing pin I23, there is a cam follower lever or member I24 which extends upward substantially par allel to the supporting member I09 and carries a cam follower roller I25 cooperable with the cam member I05. Secured to the follower member I24 there is a resilient operating arm I26 which extends upward, terminating in a. pressure member portion I2? which extends through an aperture I28 in the member I24. Secured to the hinge member I20 and extending upward therefrom there is a lever member I29 which, together with its carried parts and their adjustment relative to each other, is substantially identical with that of lever member 56 and therefore the pr mes of reference characters applied to lever member 56 and its parts designate like parts of lever member I29. The bracket arm I I8 carries a stop member I30 cooperable with the stop arm or member H as in Figs..l to 6. The control element 65' cooperates with a similar or fixed element I3I adjustabl screw-threaded in the bracket arm H8. Secured to the supporting member I09, a magnet supporting arm I32 carrying a U-shaped permanent magnet I33, this arm and magnet and their cooperative relation being the same as in Figs. 1 to 6 and therefore with primes of reference characters will be used to designate like parts in Figs. '7 and 8, excepting however that the arm I32 is urged by its inherent resilience toward the supportin member I09. The magnet I33 is therefore adjusted in relation to the contact members 65 and I 3I and to the armatur 66 by an adjustment screw I34 screw-threaded in a sleeve member I 35 secured through the supporting member I 09. The adjustment screw I34 engages the upper end portion of the arm I32 and urges the upper end portion away from the supporting member I09.

Carried by the supporting member I I0, there is a control device which is similar in all respects to that above described and carried by the supporting member I 09 but which is inverted with respect to that carried by the supporting member I09, and therefore a brief statement of the cooperative parts will suffice in connection with the foregoing description to fully describe this in.- verted control device. Pivotally supported or fulcrumed on the hinge supporting flange I50 is the lever member I5I and the cam follower member I52 which has the resiliently mounted pressure member I53 and the cam follower roller I 54 cooperable with the cam member I06. The pressure member I53 cooperates with the lever member abutment I55 to urge the lever member and its armature I56 away from the U-shaped permanent magnet I51 carried by the supporting arm I58. An adjustment screw I59 carried by the supporting member I I cooperates with the magnet supporting arm I58 to hold it in adjusted position and against its inherent resilient force away from the supporting member I I0. Carried by the end portion I60 of the leaf spring I6I there is a control element or switch contact member I62 cooperable with the control element or switch contact member I63 mounted on the bracket arm I64. The resilient positioning member I65 bears against the leaf spring end portion I60 to hold the leaf spring I6I tensioned when the contact members I62, I63 are out of engagement as shown. The stop arm I66 cooperates with the stop member I51 to limit movement of the armature I56 toward the magnet I51.

The operation of this dual control device as applied, for example, to a hot water heating system having an automatic heating apparatus such as an oil burner and an electrically driven pump or circulator for the heated water is as follows. The parts are shown in the position wherein the temperature affecting the thermostatic actuator has increased to the desired'operating temperature, say 115 F., as shown, thereby having rotated the shaft H0 and the cam members I05, I06 clockwise to the positions shown in Fig. '7. Accordingly, the follower member roller I25 has moved off of the step of the cam member I so that the magnet I33 has attracted the armature 66' to engage with a rolling, sliding movement the contact member 65 with the fixed contact member I3I, thereby to start the circulaof the oil burner.

tor pump in operation substantially simultaneously with this circuit making operation, the step of cam member I06 has rotated beneath the follower roller member I54 to overcome the force of magnetic member I51, thereby to break circuit between contact members I62, I63 with a quick substantially snap action and accordingly break the circuit of the oil burner or automatic heating apparatus. When the temperature of the heated Water has decreased below the setting of the thermostatic actuator as determined by arm 30', then the cam members I05, I06 will have been rotated counterclockwise facing Fig. 7 to bring the step of cam member I05 upward, thereby to force the follower roller I25 to the right and move contact member quickly out of engagement with contact member I3I to stop operation of the circulator. Substantially simultaneously with this breaking of circuit, the follower roller I55 will move off of the step of the cam member I06 so that magnet I51 will pull the contact member I62 into rolling, sliding engagement with the contact member I63, thereby to start operation It should be noted that the resilient pressure members I21, I53 provide for a build up of force acting to move their respective armatures away from the magnets so that the switch opening movement will be with a quick action as above described with respect to Figs. 1 to 6. It should also be noted that the cam members I05, I06 may be adjusted relative to each other so as to change the relation of the control of the circulator and oil burner or so that the dual control device can be utilized for other dual control purposes. Should it be desired, for example, to have the circulator start operation and the oil burner be cut out at substantially the same temperature of say 200 F., then the adjustment arm 30 would be moved to bring the indicator finger 30' opposite the indicia numeral 200 on the plate 32'.

What is claimed and is desired to be secured by Letters Patent of the United States is:

1. A control device comprising a supporting structure, an operating member carried by said structure, a lever member carried by said supporting structure and having a bracket portion, a control element carried by said supporting structure, a control element cooperable with said firstnamed control element and carried by said bracket portion, and means urging said lever member in one direction relative to said firstnamed control element, said operating member being cooperable with said bracket portion to move said lever member in the opposite direction.

2. A control device comprising a supporting structure, an operating member carried by said structure, a supporting member of electric insulating material and carried by said structure, a bracket member mounted on said supporting member and having a terminal, a lever member carried by said bracket member, a bracket member electrically insulated from said first-named bracket member and mounted on said supporting member, a switch contact element carried by said second-named bracket member, a switch contact element cooperable with said first-named element and carried by said lever member, and

means urging said lever member in one direction relative to said first-named element, said operating member being cooperable with and operable to move said lever member in the opposite direction.

3. A control device comprising a supporting structure,- an operating member carried by said structure, a lever ,member carried by said sup porting structure, a control element carried by said supporting structure, a leaf spring carried by said lever member and extending adjacent to said control element, a control element cooperable with said first-named control element and carried by said leaf spring, means engageable with said leaf spring and operable to hold said leaf spring under tension when said control elements are out of contact with each other, and means urging said lever member in one direction relative to said first-named control element, said operating member being cooperable with and operable to move said lever member in the opposite direction, I 4. A control device comprising a supporting structure, anoperating member carried by said structure, a supporting member carried by said structure, a levermember carriedby said supporting member ,andhaving a bracket portion, a control element carried by said supporting member, a leaf spring carried by said bracket portion and extending adjacent to said control element, a control element cooperable with said firstnamed control element and carried by said leaf spring, an abutment member carried by said bracket portion, means carried by said bracket portion and operable to hold said spring under tension when said control elements are out of engagement with each other, cooperable magnetic members, one of said magnetic members being carried by said lever member adjacent said second-named control element, means adjustably supporting the other of saidmagnetic members on said supporting member, said magnetic members being operable to urge said lever member in one direction relative to said first-named control .element, said operating member being cooperable with said abutment member to move said lever member in the opposite direction.

' 5. A control device comprising a supporting structure, an operating member carried by said structure, supporting means carried by said structure, a lever member carried by said supporting means, a control element carried by said supporting means, a control element cooperable with said-first-named control element and carried by said lever member, a supporting arm extending from said supporting means, and a magnet carried by said arm and operable to urge said lever member in one direction relative to said firstnamed control element, said operating member being cooperable with and operable to move said lever member in the opposite direction.

6. A control device comprising a supporting structure, an operating member carried by said structure, supporting means carried by said structure, a lever member carried by said supporting means, a control element carried by said supporting means, a control element cooperable with said first-named control element and carriedby said lever member, a supporting arm secured at one end and movable relative to said supporting means, a adjustment member carried by said supporting means and abutting said supporting arm, said arm being stressed against said adjustment member, and a magnet carried by said arm and operable to urge said lever member in one direction relative to said first-named control element, said operating member being cooperable with and operable to move said lever member in'the opposite direction.

"7. In a control device, a supporting member, a

supporting arm secured adjacent one end to said member and having its free end movable toward and from said member, an adjustment member operable to position said arm, a magnet carried by and on the opposite side of said arm from said supporting member, a lever member overlying said supporting arm and having an armature positioned between said magnet and said supporting member, said lever member having a bracket portion, a 7 leaf spring secured to said bracket portion and extending toward said magnet, a positioning member carried by said bracket portion and engaging/said leaf spring to hold said leaf spring stressed toward said lever member, and a control element carried by said leaf spring.

8, In a control device, a supporting member, a supporting arm secured adjacent one end to said member and having its free end movable toward and from said member, an adjustment member operable to position said arm, a magnet carried by and on the opposite side of said arm from said supporting member, a lever member overlying said supporting arm and having an armature positioned between said magnet and said supporting member, said lever member having a bracket portion, a leaf spring secured to said bracket portion and extending toward said magnet, a positioning member carried by said bracket portion and engaging said leaf spring to hold said leaf spring stressed toward said lever member, a control element carried by saidleaf spring, a bracket member extending from said supporting member a control element carried by said bracket member and cooperable with said first-named control element, and a stop member on said lever member engageable with said bracket member to limit movement of said armature toward said magnet.

9. Ina control device, a supporting member, a resilient supporting arm secured adjacent one end to said member andhaving its freeend movable toward and from said member, an adjustment member abutting and holding said arm stressed in predetermined position, a, magnet carried by and on the opposite side of said arm from said supporting member, a lever member overlying said supporting arm and having an armature positioned between said magnet and said supporting member, said lever member having a bracket portion, a leaf spring secured to said bracket portion and extending toward said magnet, a resilient positioning member carried by said bracket portion and engaging said leaf spring to hold said leaf spring stressed toward said lever member, means limiting movement of said leaf spring by said positioning member, and a control element carriedby said leaf spring.

10. In a control device, a supporting member, a magnet spaced from and carried by said member, a'lever member having an armature positioned between said magnet and said supporting membensa'id lever member having a bracket portion and having an apertured lateral arm extending away from said supporting member, a leaf spring secured to said bracket portion and extending through the apertu'rein said arm, a resilient positioning member having a'lateral thrust member engageable with and operableto tension said leaf spring, said positioning member being engageable with said'lateral arm to limit'its movement of said' leaf spring, and a control element carried by said-leaf-spring.

11. In a control device, a supporting member, a magnet spaced from and carried by said member, a lever member having an armature positioned between said magnet and said supporting member, said lever member having a bracket portion and having an apertured lateral arm extending away from said supporting member, a leaf spring secured to said bracket portion and extending through the aperture in said arm, an apertured resilient positioning member having a lateral thrust member engageable with and operable to tension said leaf spring, said lever member arm having a reduced end portion providing a shoulder and extending through the aperture in said positioning member, said positioning member being engageable with said shoulder to limit its movement of said leaf spring, means engageable by said reduced end portion to limit movement of said lever member toward said magnet, and a control element carried by said leaf spring.

12. A control device comprising a supporting member, a supporting arm having a longitudinally extending opening therethrough and secured at one end to said member, means positioning the free end of said arm relative to said member, a magnet carried by said arm on the opposite side of said arm from said supporting member, a lever member fulcrumed on said supporting member and extending longitudinally of and overlying said arm, said lever member having an armature at its free end portion movable through said arm opening for engagement with said supporting member to be stopped thereby, said lever member having intermediate its ends a bracket portion with a supporting face converging toward said lever member free end, an apertured lateral arm on said lever member between said armature and said bracket portion and extending away from said supporting member, a leaf spring secured to said face and bent to extend through the aperture in said lever member arm in substantially parallel relation to said lever member, said lever member arm having a laterally reduced end portion providing shoulders facing away from said supporting member, a resilient positioning member secured to said face and bent for spaced overlying relation to said spring, said positioning member having a lateral end flange engageable with and operable to flex said leaf spring and having an aperture therethrough receiving said reduced end portion, said positioning member en- 1 gaging said shoulders to limit the flexing of said leaf spring, means engageable by said reduced end portion to limit movement of said armature toward said magnet, an abutment member carried by said face for operative engagement by a lever member operating means, a contact member carried by said lever member adjacent said armature, and a contact member engageable by said first-named contact member.

13. In a control device, a supporting member, a resilient supporting arm fixed adjacent one end to one face of said member and spaced at its free end from said member, said arm having a rebent end portion at its free end, a U-shaped permanent magnet having its poles extending toward said lever member fixed end and secured in said rebent portion, a bracket member secured to and extending from one side edge of said supporting member and having a flange overlying said magnet, an adjustment screw carried by said flange and engaging said rebent portion to hold said supporting arm tensioned in predetermined position, a contact member carried by said flange and extending between the poles of said magnet, a stop member extending from said flange toward said supporting member, a bracket member secured to and extending from the opposite side edge of said supporting member and having a hinge-supporting flange transverse to said supporting member and opposed to said magnet, a sheet metal angle hinge member secured to said hinge flange and having one side member extending toward said magnet, a lever member secured to said side member and having an armature positioned between said magnet and said supporting member, a lateral arm on said lever member and engageable with said stop member, and a contact member carried by said lever member and engageable with said firstnamed contact member.

14. A control device comprising a casing having top and botom walls and a rear wall, a rotatable operating shaft extending through an aperture in said rear wall, an operating arm on said shaft within said casing and having a pressure member extending forward within said casing, a supporting member secured to said top and bottom walls and spaced from said rear wall, a lever member carried by said supporting member and having its fulcrum substantially in the longi tudinal centerline of said shaft, cooperable control elements carried respectively by said lever member and by said supporting member, an abutment member on said lever member and engageable by said pressure member to move said lever member in one direction, and means acting to hold said lever member against movement by said pressure member upon rotation of said shaft.

15. A control device comprising a casing having top and bottom walls and a rear wall, a rotatable operating shaft extending through an aperture in said rear well, an operating arm on said shaft Within said casing and having a pressure member of electric insulating material extending forward within said casing, a unitary switch mechanism bodily removable from said casing and having a supporting member of electric insulating material removably secured to said top and bottom walls and spaced from said rear wall, a bracket member secured to one face of said supporting member and overlying one side edge thereof and having a flange opposed to the other face of said supporting member, a bracket member secured to said one face and overlying the opposite side edge of said supporting member and having a flange opposed to said other face, said bracket members each having a. terminal member, a lever member carried by said first-named bracket member flange and having its fulcrum substantially in the longitudinal centerline of said shaft, cooperable switch contact elements carried respectively by said lever member and by said second-named bracket member flange, an abutment member on said lever member and engageable by said pressure member to move said lever member in one direction, and means acting to hold said lever member against movement by said pressure member upon rotation of said shaft.

16. A control device comprising a casing having a rear wall with an aperture therethrough and an opening spaced from said aperture, a tubular member concentric with said aperture and extending rearwardly from said wall, an adjustable sleeve bearing member rotatable in said tubular member and extending through said aperture into said casing, a rotatable operating shaft journaled in and projecting from the ends of said bearing member, a 'bimetal coil actuating member external of said casing and having one end secured to said shaft and having its other end secured to said adjustable member, an operating arm on said shaft, switch mechanism in said casing and operable by said operating arm, a plate member journaled on said bearing member and held against said rear wall in overlying closing relation to said opening, means adjustably connecting said plate member to said bearing member for rotation of said bearing member by rotation of said plate member, an adjustment arm on said plate member and extending through said opening and substantially parallel to said rear wall, a dial :plate extending upward from said rear wall, said adjustment arm having a rebent end portion providing an indicator finger overlying said dial plate, and means holding said adjustment arm in adjusted position.

' 17. A control device comprising a casing having top and bottom walls and a rear wall with an aperture therethrough, and rotatable operating shaft extending into said casing through said aperture, said top wall having an aperture, an angle bracket on said bottom wall having a vertical flange alined with and extending toward a side edge of said top Wall aperture, a unitary bodily removable switch mechanism in said casing and having a supporting plate member of electric insulating material transverse to said rear wall, said plate member having a projecting portion fitting said top wall aperture, means securing the lower edge portion of said plate member to said vertical flange, an angle bracket member having one flange substantially parallel to said rear wall and overlying the forward side edge of said :plate member and having its other flange secured to one face of said plate member, r

a supporting flange extending rearward from the lower edge of said one flange and adjacent the other face of said plate member, a substantially U-shaped bracket member overlying the rear side edge of said plate member and having one leg secured to said plate member one face and having its other leg spaced from and overlying said plate member other face adjacent the upper portion of said plate member, a supporting arm secured at its lower end to said plate member other face and having its upper end rebent to U-shaped form, a U-shaped permanent magnet having its poles directed downward and secured to the downturned end of said rebent portion, a lever member carried by said supporting flange and fulcrumed substantially in the longitudinal axis of said shaft, said lever member having an armature at its upper end positioned between said magnet and said supporting member, a switch contact element carried by said second-named bracket member other leg and extending between the poles of said magnet, means carried by said other leg for adjustably positioning said supporting arm, said lever member having intermediate its ends a bracket portion and having a lateral arm adjacent said armature and extending away from said supporting member, means on said other leg for limiting the movement of said armature toward said magnet, a leaf spring carried by said bracket portion and having a switch contact element cooperable with said firstnamed contact element, means carried by said bracket portion and holding said leaf spring under tension when said elements are out of engagement with each other, an abutment member carried by said bracket portion, and a pressure plate member of electric insulating material carried by said shaft and engageable with said abutment member to operate said lever member.

18. A control device comprising a supporting structure, an operating member carried by said structure, a supporting member carried by said structure, a lever member carried by said supporting member, a control element carried by said supporting structure, a leaf spring carried by said lever member and extending adjacent to said control element, a control element cooperable with said first-named control element and carried by said leaf spring, means tensioning said leaf spring when said control elements are out of contact with each other so that the stress in said leaf spring will substantially eliminate bouncing of said second-named control element upon its engagement with said first-named control element; and means urging said lever member in one direction relative to said first-named control element, said operating member being cooperable with and operable to move said lever member in the opposite direction.

19. A control device comprising a supporting structure, a cam operating member having a step and carried by said structure, a supporting member carried by said structure, a lever member carried by said supporting member, a control element carried by said supporting member, a control element cooperable with said first-named control element and carried by said lever member, means urging said lever member in one direction relative to said first-named control element, supporting means mounted on said structure, a cam follower member fulcrumed on said supporting means and cooperable with said cam operating member for movement up and down said step, and resilient means tensioned against said lever member by camming movement of said follower member and operable to transmit movement from said follower member to said lever member to move said lever member in the opposite direction.

20. A control device comprising a casing having top and bottom walls and a rear wall with an aperture therethrough, and rotatable operating shaft extending into said casing through said aperture, said top wall having an aperture, an angle bracket on said bottom wall having a vertical flange alined with and extending toward a side edge of said top wall aperture, a unitary bodily removable switch mechanism in said casing and having a supporting plate member of electric insulating material transverse to said rear wall, said plate member having a projecting portion fitting said top wall aperture, means securing the lower edge portion of said plate member to said vertical flange, an angle bracket member having one flange substantially :parallel to said rear wall and overlying the forward side edge of said plate member and having its other flange secured to one face of said plate member, a supporting flange extending rearward from the lower edge of said one flange and adjacent the other face of said plate member, a substantially U-shaped bracket member overlying the rear side edge of said plate member and having one leg secured to said plate member one face and having its other leg spaced from and overlying said plate member other face adjacent the upper portion of said plate member, a supporting arm secured at its lower end to said plate member other face and having its upper end rebent to U-shaped form, a U-shaped permanent magnet having its poles directed downward and secured to the downturned end of said rebent portion, a lever member carried by said supporting flange and fulcrumed substantially in the longitudinal axis of said shaft, said lever member having an armature at its upper end positioned between said magnet and said supporting member, a switch contact element carried by said second-named bracket member other leg and extending between the poles of said magnet, means carried by said other leg for adjustably positioning said supporting arm, said lever member having intermediate its ends a bracket portion and having a lateral arm adjacent said armature and extending away from said supporting member, means on said other leg for limiting the movement of said armature toward said magnet, a leaf spring carried by said bracket portion and having a switch contact element cooperable with said first-named contact element, means carried by said bracket portion and holding said leaf spring under tension when said elements are out of engagement with each other, an abutment member carried by said bracket portion, a cam follower lever fulcrumed on said supporting flange and extending along said supporting member, a, cam operating member mounted on said shaft and engageable with said follower lever to move the same, and a resilient operating arm carried by said follower lever and engageable with said abutment member to operate said lever member.

21. In a control device, supporting means, a fixed contact member carried by said means, a supporting arm on said means, a magnet carried by said arm, an adjustment member on said means and holding said arm flexed in predetermined position, a lever member having an armature cooperable with said magnet, stop means engaged by said lever member to maintain an air gap between said armature and said magnet, said lever member having an aperture, a leaf spring secured to said lever member and having a portion extending through said aperture, a contact member carried by said leaf spring adjacent said aperture, said leaf spring being tensioned to move said second-named contact member toward said fixed contact member when said contact members move out of engagement, and means on said lever member cooperable with said leaf spring to limit movement of said second-named contact member toward said fixed contact memher and to hold said leaf spring tensioned when said contact members are out of engagement with each other.

EARNEST J. DILIMAN.

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