US1737010A - Timing and reversing mechanism - Google Patents

Description

Nov. 26,1929.

Filed OCC. 31, 1924 TIMING AND REVERSING MECHANISM 4 Sheets-'Sheet l Nov. 26, 1929. J. c. HANNA 1,737,010

TIMING AND REVERSING MECHANISM Filed oct. 51, 1924 4 sheets-sheet 2 g if@ jfs! TIMING AND REVERSING MECHANISM Filed oct. 51, 1924 4 sheets-sheet s @/z/v, CML/amm By MM 'KLM Nov. 26, 1929. .1.c. HANNA TIMING AND REVERSING mEcHfxNIsM 4 Sheets-Shet 4' Fild 001;. 3l. 1.924

. WW MWNNI! Patented Nov. 26, 1F29 TIMING AND-REVERSIN G MECHANISM appncaaon mea october 31,1924. serial No. 746,952.

Thisinvention relates to improvements in timing Yand reversing mechanism, and has for its object to provide-a mechanism especially adaptedforfuse in conjunction with a rivet- .f5 ing-,or similar type of machine..

It-.iszfwell known-that in pressure riveting operations, especially where the operator is paidon a piece-work basis, that the tendency istoehurry the work and `allow insufficient time for the rivet to set under therivetingpressure. In otherwords, the operator is inclined to -hurry the return stroke of the rivet-ing diebefore the rivet has had suflicient time to set. Thisresults in defective riveting and necessitates calking to prevent leakagefalon-g the riveted joint.

vMy present-inventionv consists of a mechanism-Which will function to control flow of actuating-fluidlto the riveting or othermachine 'with whichthe mechanism is used in such wise ythat upon depression of the operating lever the machine will commence its rivetingorzworkingstroke;v As soon as resistance to -this'strokehascaused the pressure of thev actuatingfluid in the cylinder to build up to a desired point, this built up pressure istransmitted. to my timing mechanism, andcontrol ofthe machine forl the balance of its cycle is removed from. the operatorto the mechanism. y The lattermay be set to permit a certain time-to elapse after the riveting or other operation is initiated before-the working tool iszreturned to initial positiony ready for repetition :ofits cycle of operations.

Other yobjects residein the details offmy mechanism 'and-the operative. connection to the working machina These objects will be more fully `describedin the following specifi- 40 cation and shown in the accompanying drawings, -in which Fig. 1 isa vertical section along lline1-1 of Fig..2.

Fig.V 2 is a similar section `taken at right angles to the section of Fig..1.

Fig. 3 isV a .vertical section along the line Of l.'

Fig.,4 is a diagrammatic view illustrating` the -adaptation of my mechanism to a riveter, the jaws and sides thereof being drawn to a larger scale than the balance ofthe illustrated apparatus.

Like Vnumerals refer to vthe same elements. throughout the drawings. box or casing havingthe base. portions 10a 10 designates a' and the supporting feet V101? apertured for insertion of fastening bolts or the like tosecure the casing to the oor or foundation. A upporting frame, generally indicated by numeral 11, extends into the casing 10, being supported by its flanges 11L which are bolted to the side wallsof casing 10 and form a coverv therefor.

Thisframe is provided with the spaced MWalls 11'b and 11C, between 'which' eX- tends theconnecting portion 11d (see Fig. 2). At thebottonrthe walls 11b and .11c are connected by the base yplate 11:0, which is extended at one side to form a supporting base for an electric motor, generally indicated my nll- tions 14d mounted lin the seats of supporting lugs` 13 .described above..

This head 14c is provided withthe angular duct 14e which connects at.l oney end withthe .interiorof a metallic..cylindrical bellows'member 16 and at :the other end with the fluid supply duct 17, which extendsfupwardly through the casing, asshown inFig. 4 for example. This tubel? iseither constructed ofsuficientrflexibility,orhas:a kflexible section interposed to accommodate the rocking motion ,ofthe telescopic' tube .14 on'its `trunnions 144.

At its upper endthe member-'16 is provided with a head1@L threaded into engagement `with the `lower end of inner tube 14a.

The latter is slotted near its lower portion as indicated by nume1'al'14f, and a `pin 18 extends through said slot, being anchored at its ends in the outer tube 14".

Slots `14f.y permit relative movementof the inner tube 14a withy respect to the outertube r14".

Extending across the tube 14" at the upper end thereof is the fixed pin 19, and between pins 18 and 19 extends a coiled spring 21 under compression. At the upper end of tube 14a is provided a head 14g threaded thereto, this head being provided with the spaced upwardly extending lugs 14 between which extends the shaft 23 carrying the roller 24 and ball bearings and container 25 mounted upon the shaft 23 between the lugs 14h (see Figs. 1 and 2). Projecting outwardly and downwardly from the head 14g are the fingers 14k, having the angularly disposed lugs 14l at their lower extremities, as shown in the drawings. Projecting downwardly from the lower head 14c is the apertured boss 14m, through which is inserted the laterally projecting pin 25 carried by the threaded stud 26 and threaded into suitable aperture in the small lug 11X extending upwardly from base flange 11e (see Fig. 2 for example). The stud 26 is larger in diameter than the pin 25 and the shoulder is formed in this manner, against which abuts the disc 28 shouldered to form a seat for one end of the coiled compression spring 30, the other end of which engages the sliding plug 31 on the pin 25, this plug being slidable on the pin and also shouldered for accommodation of the coiled spring 30. This plug' presses against its boss 14m. The force exterted against this boss may be varied by adjusting the position of the stud 26, which is provided with the slot 26"L in one end for engagement by a screw driver or the like for locking in adjusted position by the lock nut 32. Mounted upon the top of the cover flange 11 is the auxiliary casing 435, having the side walls 36, through and between which extends the bolt 37. At one end the casing 35 is slotted at 353L to accommodate the operating handle 46, which is pivoted intermediate its extremities upon the bolt 37. This operating handle 40 is bifurcated to form the spaced arms 40a, the outer end of one of which is provided with the inwardly directed lug 401 (see Fig. 2). Located between the arms 40n are a pair of spaced guide plates 42, between which is secured a cam plate 43 by the bolts 44 or the like. This cam plate 43 is provided with a double curve, one portion 43a of which is contacted by the roller 24 during the riveting stroke, the other portion illustrated in dotted lines in Fig. 2 and designated by numeral 43h, is acted upon by such roller to reverse the control of the machine. The guide plates 42 and cam plate 43 are also pivoted upon the bolt 37. The cam plate 43 is provided with the spaced sockets 42c in 'the upper portion thereof. In each of these sockets is seated one rounded end of a link 45, these links being pivoted at their other ends to the lower extremity of cut-off valve 46. It will be apparent that by this construction, upon either direction of movement of the operating handle 40 about the bolt 37, one of the links 45 will be raised and the valve 46 lifted from its seat thereby.

The guide plates 42 are extended laterally,

as indicated by numeral 42d, and betweenv (see F ig. 2). The lug 40b on the extended end of operating handle 40 underlies one of these plate extensions 42d, and has secured to it at 40X one end of the cord 51. At the other end of the cord is secured the weight 53. At one side of one of the plate extensions 42c1 is secured a stud 56, around which is bent one end n of a clutch operating rod 60. At its lower end rod 60 is provided with the lock nuts 62 threaded thereon. A coiled spring 63 extends upwardly from such lock nuts, and a collar 64 is mounted thereabove to sli-de on rod 60. Spaced from the spring and located thereabove is the clip 65'split and bolted in adjusted position to the rod by the bolt and nut 66.

On the shaft of motor 12 is secured a sheave or pulley 63, around which is mounted the belt 69 also running around the drive pulley 7 O, which is carried upon shaft 71. To this shaft is secured a worm 71a meshing with the worm gear ring 73. This ring is frictionally held against the outer clutch of the gear disc 75 by means of spring portions 7 6a of a second disc 76. This construction permits slipping of the gear ring 7 3 should the mechanism driven thereby encounter an unusual resistance.

The gear disc 7 5 is rotatably mounted upon the shaft 80, and is provided at its hub portions 7 5a with clutch teeth 7 5b. Splined to and slidable upon the shaft is a clutch 82 grooved at 82a to accommodate the ends of shifter fork 83. Extending downwardly and outwardly from one of the lugs 7 2 is the arm 85, at the lower end of which is ournaled the rod 86, to which is secured the clutch shifter 83 adjacent one end. `Adjacent the other end is the actuating arm 87 likewise secured to such rod and provided with the angularly disposed finger 87a (see Figs. 1 and 3), this finger being apertured to permit insertion therethrough of the clutch rod 60, this linger 87 being contactable by the spring washer 64 or the clip 65, depending upon the direction of movement of the rod. It will thus be apparent that the rod 60 may be actuated to shift the clutch 82 into or out of mesh with the clutch teeth 75b of worm gear disc 75. At its other end the rod 80 is provided with a pinion 90 secured thereto, this pinion meshing with the gear 91, having on its outer rim a plurality of holes 91a spaced at calculated intervals. This gear 91 is rotatably mounted upon the shaft 92 journaled in bosses 11y of walls 11b and 11". To one end of the shaft 92 iso to which secured one end or the coiled spri* the other end thereof being anchored to the side wall 11b, this spring being constructed oi tempered metal functioning in a manner similar to that oi' a clock spring. il pair spaced striker arms 100 are secured to the. shatt 92, these arms being located and arranged to strike the fingers 141 in their orbit of travel.

lt will be apparent that when the shaft is clutched to gear .75, the pinion will rotate gear 91 against the action of spring 98 which will be wound up. rllhe rotation of gear 91 is in turn transmitted to shaft and thus to the striker arms 100, which will be rotated until they strike the fingers 141. The de-clutching ot the shaft 30 after such movenient will result in the gear 91 being returned to normal position by the coiled spring 98. A lug 11 projects trom the wall 11b from the casi-ng and is provided with a pin 101 entendi therethrough, having the head 101 at one end (see Fig. 2). A collar or washer 102 of rubber or `other resilient material is interposed between the head 101a and he lug 117'. Projecting from one spoke of `he gear 91 is the projecting lug 91X, which will contact with the cushion head 101EL of pin 101 to determine the normal or rest position of gear 91.

Extending upwardly from the casing is the valve bleek 120 in which are provided the valve chambers 121 and 122. ln the former is provided a seat 121a upon which normally seats the soft collar 123b carried on the valve 123 ln the upper portion ot the chfilnber 121 is irovided a coiled compression spring 125 extending between the end of the chamber and the sliding cap 123C secured to the valve 123 by the nut 123 threaded on a threaded extension 123d of valve 123. This cap 123C thus serves to maintain the sott collar 123b clamped to the valve stem 123 against enlarged flange 123e thereof, and aets as a guide for the valve. rlhis valve is normally maintained in closed position by the con pression of s )rin 125. A washer 126"1 of leather or the like is provided to co-aet with 'tie `cap 123C to prevent leakage of operating fluid. An opel`- ating fluid supply pipe 130 leads to the valve chamber 121, while therefron'i leads the duct 121t to the secon d valve chamber 122, in which mountet the balanced piston valve 131 of lconventional construction having the exhaust elbow 131a. From the valve chamber 122 lead the ducts 133 and 1347 the former being arranged to supply actuating luid tor. the riveting stroke for example, the latter supplying actuating fluidfor the exhaust stroke, these ducts also serving for exhaust from the respective ends of the cylinder. Extending downwardly from the lower end oi valve 131 and pivotally attached thereto is the link138 pivoted at its other end on the bolt 139 yentending between the guide plates 42. By this construction pivotal movement oft the operating handle 40 in one direction will function to supply actuating fluid to one end of the machine cylinder permitting exhaust from the other end, and movement ofthe operating handle in the opposite direction willreverse these flows.

Projecting downwardly from the top of casing 35 are the stop studs 140, limitingy the pivotal movement of the operating handle 40 in each direction.

In Fig. 4 l have designated the machine cylinder by the numeral 145, the same being provided with an actuating fluid chest to which the fluid is suppliedfrom the valve chamber. indicates the movable die carried by the die plunger 151, while therebeneath is located the stationary die 152. 19rd jecting outwardly from the upper end of plunger 151 and movable therewith is the plate 154 apertured to accommodate the rod 155 which is provided with the head 155a at its upper end. This rod 155 is slidablyeztM tended through'a second Xed*` plate 156, projecting outwardly from the fixed jaw 158 of the machine. Atits lower end the rod 155 carries the link 155b to which is attached the end of Bowden wire 160, which is reci procable in a flexible tube 161 of well kknown construetion. One end of this tube is anchored in the bracket 163 and the other endis carrier, to and secured to the cover flange 11a see Fi 2). The corresponding end of Bowden wire is provided with a securing button 160 attached to the operating handle 40.

It will be apparent with this construction that when the mechanism is in the position shown in `Fig. 4, for example, with the plunger 151 and die 150 retracted from riveting position that the operating handle 4() may be depressed without interference from the Bowden wire cont-rol, as the stem 155 will rise vei tieally with respect to plate 154. Lift of handle 40, however, is prevented by the head 155a on stein 155, so that the control valve may not be moved to reverse position which would result in waste of air. When the die has coinpleted a riveting stroke, the sliding engagement of plate 154 with stem 155 will permit relative movement without affecting the position of the wire 160. As will be explained later. the operating` handle is moved to reverse position or upwardly from normal position on the return stroke, and is returned to normal position shown in Figs. 2 and 4, for er:- ample, b y the upward movement of the plunger 151 and plate 154, thus bringing the delay and timing mechanism to neutral position. Check valves 133a and 134a are inserted in the respective pipes 133 and 134 and 1try-pass pipes 133h and 134b extend therearound respectively. In these by-pass pipes are provided the reversely actuating check valves 133C and 134c respectively to permit by-pass and exhaust ot air from that end of the cylinder to which the actuating fluid is not being admitted. The purpose of this by-pass and checlrvalvc construct-ion is to permit flow of actuating -tluid in one direction through the main pipe, the check valve 133a or 134a opening to permit such flow, and the check valve 133C or 134C closing to prevent flow through the by-passes. Reverse flow in either line is prevented through the main pipe by the check valves 133L and 134i1 closing and forcing the flow through the by-pass pipes, the check valves 133C and 134C therein opening to permit such flow. By this means I am enabled to regulate the flow in the two directions in each line by properly selecting or adjusting the orifice in the check valves. For instance, iiow through the check valves 133a or 134-"L may he actuating flow of the tluid under pressure which may be relatively restricted, while flow through either of the by-passes will be eirhaust flow and will be relatively unrestricted to permit tree exhaust.

Secured by bolts 200 or the like to the side wall 11c of the frame is theA oil trough'201 (see Figs. 1 and 3, for example), through which rotates the worm gear 73, the same being thereby constantly lubricated.

Depending from the cover flange 11L is an oil reservoir 20.3, from which lead a plurality of lubricating pipes 204 to the various bearings and other elements requiring constant lubrication. A cover 205 is provided for this reservoir to permit refilling from time to time as required.

In the operation of the machine, assuming the pipe to be att-ached to a source ot actuating Huid under pressure and the parts in normal position, as illustrated in the drawings, the operation is as follows: The operator depresses the operating handle 40 whereby the same is pivoted about the bolt 37. A litt will be thereby exerted upon the eXtension 421 of guide plate 42 through the linger 40b,which will result in a partial rocking of the guide plates and cam plate 43 about the bolt 37. A litt will be thereb imparted by the right hand link 45 as viewed in Fig. 2 to the valve stem 123, thereby permitting iiow of tluid under pressure to the valve chamber 122 through duct 121f. rl`his same movement of the guide plates 42 lifts the control valve 131 through the medium of link 138 to position in which actuating luid will `flow through duct 133 to the machine cylinder to eil'ect the working stroke of the riveting die 150. The same movement of valve 131 opens the duct 134 to the atmosphere through elbow 131L and permits exhaust from the opposite end of cylinder 145. The rocking oi' the cam plate 43 alters the relation ot the arcuate surface 43l with respect to the roller 24, and the coil spring 30 acting on the lower end oi the telescopic expansible member 14 swings the same around its trunnions 14d to a right hand position from that viewed in Fig. 2. The compression o spring 21 serves to maintain the roller 24 in contact with the cam during this movement. As the piston in cylinder 145 moves from the right hand end of such cylinder on operative stroke, the pressure in member 16 will not be appreciably raised due to the angle of the connection of supply pipe 17 to pipe 133, as shown in Fig. 4. As the die encounters resistance from the rivet, tor example, the pressure in cylinder 145 will build up, and such pressure is transmitted baci; through pipe 17 to the member 16, which expands and in etliect locks the cam and roller in i'` 1it hand position as soon as the pressure .n the member is suiiicient to overcome the downward pull of weight 53 acting on the extension 42d of guide plate 42. As eX- plained above, this movement or' the operating handleor lever 40 is not interfered with by Bowden wire 160 owing to the sliding engagement of stem with plate 154. is soon as the pressure in member 16 has built up to a predetermined point, as for example 55 pounds which I find suilicient for use with a line pressure ot 100 pounds to the square inch, the operating handle 40 may be released as movement upwardly thereby will not aiiect the position of cam 43 due to the locking or resistance by the telescopic member 14 just described. It will be appreciated that the time required for the pressure in the sylphon to build up to this point is very slight, but this construction and arrangement permits the operator to re 7erse the riveting die 150 should he so desire before the die encounters resistance, but the resistance builds up so rapidly after the rivet is contacted by the die as to almost immediately lock the cam and roller in their right hand position.

The electric motor 12 is running constantly at a comparatively high rate of speed, and during the non-operation ot the mechanism the rotation which is transmitted to the large pulley 70 is of no el'lec't, as such rotation is transmitted through shaft 71 and worm 71n to gear 73 which will rotate on and relative to sha-tt 80. TWhen the operating handle 40 is depressed, however, the upward movement o'l' the right hand end o't" guide plate 42 is transmitted through clutch rod GO and the spring collar 64 is brought into contact with lug 87 at the end of leiin) to reciprocate the same, a control mechanism comprising a valve to control flow of such actuating fluid, operating means operatively associated therewith and manually movable to move said valve to position to effect riveting stroke of said die, and mechanism controlled by said operating means to effect reversal of said valve and thereby said fluid actuated means and said die after a desired period of time.

2. In combination, a riveter comprising a reciprocating die, a fluid actuated means to reciprocate the same, a control mechanism comprising a valve to control flow of such actuating fluid, operating means operatively associated therewith and manually movable to move said valve to position to effect riveting stroke of said die, mechanism controlled by said operating means to effect reversal of said valve and thereby said fluid actuated means and said die after a desired period of time, and means associated with said riveter to return said operating means to normal position upon completion of said die reversal.

3. In combination, a riveter comprising a reciprocating die, a fluid actuated means to reciprocate the same, a control mechanism comprising a valve to control flow of such actuating fluid, a lever and a cam operatively associated therewith and manually movable to move said valve to position to effect riveting stroke of said die, and mechanism controlled by said lever and cam to lock for a period of time and thereafter reverse said valve and lever and cam and there-- by said fluid actuated means and said die.

4. In combination, a riveter comprising a reciprocating die, a fluid actuated means to reciprocate the same, a control mechanism comprising a valve to control flow of such actuating fluid, operating means operatively associated therewith and manually movable to move said valve to position to effect riveting stroke of said die, mecha- 'nism controlled by said operating means to effect reversal of said valve and thereby said fluid actuated means and said die after a desired period of time, and means associated with said riveter to return said operating means to normal position upon completion of said die reversal, said last named means comprising a Bowden wire and casing.

5. In combination, a riveter comprising a reciprocating die, a fluid actuated means to reciprocate the same, a control mechanism comprising a valve to control flow of such actuating fluid, a lever and cam operatively associated therewith and manually movable to'move said valve to position to eflect'riveting stroke of said die, mechanism actuated by said lever and cam to effect reversal of said valve and thereby said fluid actuated means and said die after a desired period of time, and means associated with said riveter to return said lever and cam to normal position upon completion of said die reversal, said last named means comprising a Bowden wire and casing, said wire being operatively connected to said die.

6. In combination, a riveter comprising a reciprocating die, a fluid actuated means to reciprocate the same, a control mechanism comprising a valve to control flow of such actuating fluid, operating means operatively associated therewith and manually movable to move said valve to position to effect riveting stroke of said die, mechanism controlled by said operating means to effect reversal of said valve and thereby said fluid actuated means and said die after a desired period of time, and means associated with said riveter to return said operating means to normal position upon completion of said die reversal, said last named means comprising a Bodwen wire and casing, said wire being provided with a stem member, an apertured plate operatively attached to said die, said stem being headed and slidable in the aperture of said plate, the head of said stem being engageable by said plate adjacent one limit of travel.

7. In combination, a chambered valve body and riveting cylinder, a duct to supply actuating fluid to one end of said cylinder, a second duct to supply actuating fluid to the other end thereof, said ducts leading from the chamber in said valve body, a valve operable to throw either of said ducts into communication with a source of supply or an exhaust passage or to close both said ducts when in normal position, a third duct attached to said first duct at an angle thereto, operating means and delay mechanism comprising a locking member actuatable by fluid from said third duct to lock said operating means in operating position for a desired period of time.

8. In combination, a main cut off valve and a control valve, means to supply actuating fluid to said control valve upon opening of said cut off valve, operating means comprising a manually operable member and a coacting actuating member, said co-acting member being actuatable in one direction on movement of said manually operable member in a corresponding direction, said co-acting member being operatively attached to said control valve to move the same simultaneously therewith, said co-acting member being also operatively attached to said cut ofi valve to move it to open position on movement in either direction, means to normally maintain said operable member and said co-acting member in operative adjustment, means operable to lock said co-acting member after movement by said manually operable member for a desired period of time.

9. In combination, a main cut off valve and a control valve, ymeans to supply actiuuamgV a correspondingdirection, said co-acti member being` operatively attached to said controlvalve to` move the same simultaneouslyv therewith, said co-acting ber being also operatively attached to said cut oil valve to move it to open position on moif'ement in either direction, means to normally maintain said operable member and said co-aeting member in operative adjustment, means operable by fluid pressure after movement of said control valve to one position to loclr` said co-acting member against movement by said manually operable member.

i0. In combination, a cut oli valve and a. control valve, means to supply actuating fluid to said control valve upon openingr oi said cut oil valve, operating means comprising` a manually operable member and a cio-actingl actuating member, said co-actim; member being' actuatable in one direction on movement of said manually operable member in a corresponding direction, said co-acting member being` operatively attached to said control valve to move the same simultaneously therewith, said eo-acting member beine; also operatively attached to said cut oil' valve to move it to open position on movement in either direction, means to normally maintain said opera-ble member and said co-actinp, member in operative adjustment, means operable to lock said eo-acting member after movement by said manually operable member, means to Withdraw said locking means from locking relation after a desired period of time.

ll. In combination, a main out oil valve and a control valve, means to supply actuating fluid to said control valve upon opening of said cut ott valve, operating means comprisinga manually operable member and a co-actingr actuating member, said co-acting` member beingl actuatable in one direction on movementof said manually operable member in a corresponding direction, said eo-actinp;

member beingl operatively attached to said control valve to move the same simultaneously therewith, said co-acting` member being` also operatively attached. to said cut oil valve to move it to open position on movement in either dir ction, means to normally maintain said operable member and said co-aoting member in operative relation, means operable by fluid pressure after movement of said control valve to one position to lock said co-acting;` member gainst movement by said manually operable member, means to Withdraw said locmng means from locking relation.

i2. In combination, a main cut'otfvalve and control valve, means to supply actuatli id to said control valve upon opening et said out oil1 valve, operating means comprising a manually operable member and a c'o-actin'g` actuating member, said eo-aoting member being aetuatable in one direction on movement oit said manually operable member in a corresponding` direction, said co-aoting member being,` operatively attached to said control valve to move the same simultaneously therewith, said co-acting member being also operatively attached to said'cut on valve to move it to open position on movement in either direction., means to nor nally maintain said operable member and said co-acting member in operative adjustment, means operable by iluid pressure after movement of said control valve to one position to lock said co-acting .member against movement by said manually operable member, means to Withdraw said locking means 'from looking relation, said maintaining` means being operable after said Withdrawal to actuate said operating means to reverse the position of said control valve.

13. ln combination,- a control valve, an-foperating lever, a Cain member movable with said lever, an expansible member incontact with said cam member, means to swing said expansible member on movement of said-'cam member in one direction from normalor rest position to position maintaining said cam and thereby said valve in open valve position.

` le. ln combination, a control valve,'-an operating lever, a-cam member movable With said lever, said operating member being provided With means to move said cam member in one direction of travel, an expansible. member in Contact with said cam member, means to svvinp; said expansible memberon movement of said cam member in one direction from normal or rest position to position maintaining said cam and thereby said-valve in open valve position.

15. In combination, a controlvalve, anoperating lever, a cam lever movable with said lever, an expansible member in contact With said cam member, means to swing' said expansible member on movement' of said cam member in one direction, from normaler rest position to position maintaining saidcam and thereby said valve inlopen valve position, a bellows member associated With said eXpansible member to be expanded and maintain said cam member in said open position, said valve being aotuatable by said cam member.

16. In combination, a control valve,-an operating lever, a cam lever movable with said lever, an eXpansible member in contact with said cam member, means-to swing saideX- pansible member on movement oisaid cam member in one direction from'normalor-re'st position to position maintaining said vcam and thereby said valve in open valve position, means co-acting with said expansible member to lock said cam member' in said open position, said valve being` actuatable by said cam member.

17. In combination, a control valve, an operating lever, a cam lever associated therewith, an expansible member in contact with said cam member, means to swing said ei;- pansible member on movement ot said cam member in one direction, means co-acting with said expansible member to loclr said cam member in said position at one limit of travel, said valve being actuatable by said cam member, a delay mechanism comprising means to engage and return said enpansible member to normal position.

18. ln combination, a control valve, an operating lever, a cam lever associated therewith, an expansible member in contact with said cam member, means to swing said expansible member on movement of said cam member in one direction, means co-acting with said expansible member to lock said cam member in said position at one limit olf travel, said valve being actuatable by said cam member, a delay mechanism comprising means to engage and return said ezzpansible member to normal position, and electrically actuated means to actuate last named means.

19. In combination, a control valve, an operating lever, a cam lever associated therewith, an expansible member in Contact with said cam member, means to swing said ei;- pansible member on movement of said c am member in one direction, means co-actmg with said ezrpansible member to loch said cam member in said position at one limit oi: travel, said valve being actuatable by said cam member, a delay mechanism comprising means to engage and return said enpansible member to normal position, an electrically actuated means to actuate saidV last named means, means actuatable on movement ot said cam member in said direction of travel to throw said electrically actuated means into operation.

20. ln combination, a control valve, an operating lever, a cam lever associated therewith, an eXpansible member in contactwith said cam member, means to swing said enpansible member on movement of said cam member in one direction, means cio-acting with said expansible member to lock said cam member in said position at one limit of travel, said valve being actuatable by said cam member, a delay mechanism comprising means to engage and return said enpansibie member to normal position, an electrically actuated means to actuate said last named means. means actuatable on movement o'lE said cam member in said direction el travel to throw said electrically actuated means intooperation, means resisting movement or" said cam member from normal position.

21. ln combination, a control valve, an operating lever, a cam lever associated therewith, an expansible member in contact with said cam member, means to swing said eX- pansible member on movement of said cam member in one direction, means co-acting with said expansible member to lock said cam member in said position at one limit of travel, said valve being actuatable by said cam member, a delay mechanism comprising means to engage and return said eXpansible member to normal position, an electrically actuated means to actuate said last named means, means actua-table on movement of said cam member in said direction ot travel to throw said electrically actuated means into operation, means resisting movement of said cam member from normal position and normally maintaining said operable member in operable engagement therewith.

Q2. ln combination, an operating lever, a cam member movable in one direction by said operating lever, said cam being provided with a curved concaved contact surface, the curve thereof comprising arcs joined at a neutral point, a roller contacting therewith, means to shitt said roller on said cam surface from said neutral point upon movement of said by said operating lever, said means beoperable to hold said cam through the ncdium of said roller in shifted p-osition.

ln combination, an operating lever, a cam member movable in one direction by said operating lever, said cam being provided with a curved concaved Contact surface, the curve thereof comprising arcs joined a neutral point, a roller contacting there- `Yith, means to shit't said roller on said cam surface trom said neutral point upon movement of said cam by said operating lever, means co-acting with said roller to lock said cam in one position after movement ot said cam and roller.

2li. ln combination, an operating lever, a cam member movable in one direction by said operating lever, said cam being provided with a curved concaved contact surface, the curve thereof comprising arcs joined at a neutral point, a roller contacting therewith, means to shift said roller on said cam sui-tace from said neutral point upon movement of said cam by said operating lever, means co-acting with said roller to lock said cam in one position alter movement of said cam and roller, said last named means comprising a iluid actuated member.

25. In combination, an operating lever, a cam movable in one direction thereby, provided with a curved concaved contact surtace, said surface being formed of a pair of arcs oined at a neutral point, a roller contactable with said surface, an eXpansible member carrying said roller, said member being mounted to swing about an axis, the

curves of said cam normally diverging inwardly from the orbit of said roller to resist movement from neutral thereof.

26. In combination, an operating lever, a cam movable in one direction thereby, provided with a curved concaved Contact surface, s sui-face being 1to1-med ol? pair of arcs joined at a neutral point, a rollerl contactable with said surface, an expansible member carrying' said roller, said member being` mounted to swing about an axis, the curves of said cam norniially diverging inwardly from the orbit ot said roller to resist movement 'from neutral thereof, means coacting` with said lever and cam to resist movement of the latter by the former.

2T. in eombinatfon, an operating lever, a cam movable in one direction thereby, provided with a curved concaved Contact surface, sait` surface being formed of a pair ot arcs joined at a neutral point, a roller contactable with said surface, an expansible member carrying` said roller, said member being mounted to swing about an axis, the curves oi? said cam normally diverging inwardly 'from the orbit of said roller to resist movement from neutral thereof, means co-acting with said lever and cam to resist movement el? the latier by the former, said means being' also constructed and arranged to maintain said cam in operative relation to said lever.

28. ln combination, an operating lever, a cam movable in one direction thereby, provided with a curved concavcd Contact surface, said surface being,` formed oiC a pair oit arcs join d at a. neutral point, a roller contactable 'nl i said surface, an efipansible member carrying` said roller, said member being niountcd to swing, about an axis, the curves ot said cam normally diverging inwardly from the orbit or said roller to resist movement trom neutral thereof, means co-acting with said lever and cam to resist movement of the latter by the former, said means being,` also constructed and arranged to maintain said cam in operative relation to said lever, said means being,` also constructed and arranged to resist movement or" said roller and expansible member from neutral position in one direction.

29. ln combination, an actuating` member, a manually operable member co-acting therewith to move the same to an operating position., means to lock said actuating member in such position, means to withdraw said locking` means from locking position, said last named means comprising a withdrawing member, an electric motor, and means to transmit rotation from said motor to said withdrawing` member, means actuated simultaneously with the movement of said operating member to throw said motor into operative relation with said withdrawing member.

.30. In combination, an actuating member,

manually operable member co-actingtherewith to move the same lt0 operating position, locking means to lock said member in such position, means to Withdraw s aid'lOkng from locking relation, said last ne ined means comprising .a withdrawal -memn, an elet motor, means to transmit rotation `of said motor .to said withdrawal member, said last named means comprising? clutching` means movable into driving rel-ation upon movement of said actuating memmanually operable actuating` means, means to lock said lirst named means in one position, means to withdraw said locking means from locking` relation, said last named means comprising a delay mechanism, said delay mechanism comprising a rotatable arm, a gear rotatable therewith, means associated with said lgear to normally return the same to a rest position, a stop, and stop means carried by said gear to contact said stop at rest position.

33. In combination with a riveter comprising aA reciprocating` die and iuid actuated means to move said die to and from riveting position, a control valve, a manually operable member operatively attached to said valve and movable to open and close the same, means to automatically lock said member in open valve position, means to release said locking' means after a desired period ot time, the actuation of said locking means being` initiated by movement of said member, and means to return said member and valve to closed valve position after release of said locking means.

34. In combination with a riveter comprising` a reciprocating die and fluid actuated means to move said die to and from riveting posit-i on, a control valve, a manually operable lever having a cam surface and operatively attached to said valve to move the same to and trom open position, means to automatically lool: said member in open valve position including` an eXpansible member pivotally mounted and contacting with said cam surtace, means to release said locking member after a desired period of time, and means to return said member and valve to closed valve position after such release.

ln combination with a riveter comprising a reciprocating die and fluid actuated means to move said die to and from riveting position, a control valve, a manually operable lever having a cam surface and operatively attached to said valve to move the same to and from open position, means to automatically lock said member in open valve position including an eXpansible member pivotally mounted and contacting with said cam surface, other means to supply eX- tending fluid pressure to said member upon opening of said valve whereby the said member will move along said cam surface and lock said lever in open valve position, means to release said locking member after a desired 15 period of time, and means to return said member and valve to closed valve position after such release.

In Witness whereof, I hereunto subscribe my name to this specification.

,2 0 JOHN o. HANNA.v

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