US2085426A - Rounding machine - Google Patents

Description

June 29, 1937. J. GOULDBOURN ET AL 2,085,426

ROUNDING MACHINE Filed May 20, 1935 4 Sheets-Sheet l VENTUFE June 29, 1937. J. GOULDBOURN ET AL 2,035,425

ROUNDING MACHINE June 29, 1937. J. GOULD'BOURN ET AL ROUNDING MACHINE Filed May 20, 1935 4 Sheets-Sheet 5 Patented June 29, 1937 UNITED STATES PATENT OFFICE ROUNDING MACHINE Application May 20, 1935, Serial No. 22,302 In Great Britain July 13, 1934 23 Claims.

This invention relates to machines for operating upon Work-pieces, and is concerned with apparatus for cutting out or rounding shoe-soles or other articles which are clamped upon a pato tern and acted upon by a knife under the guidance of the pattern.

Machines of the class referred to, as in general use, present some risk to the operator of the machine, in that he may be injured by the knife or other movable operating elements. This has been due to the fact that one or both of the operators hands have been unoccupied while the machine is in operation and may accidentally be moved into positions of danger.

It is an object of the present invention to reduce the risk of injury to the operator in the manner just indicated. In the construction illustrative of the invention which is hereinafter described, each hand of the operator is so occupied in starting the driving of the machine or causing the machine to complete its operating cycle that during the operation the danger of injury is minimized.

Treadle mechanism by which clamping pressure is applied to the work in the machine of this invention is made the subject of a divisional application filed in the United States Patent Office on December 6, 1935, in the name of Harold E. Elliott, Serial No. 53,250.

The above and other objects and the several features of the present invention will become apparent from a consideration of the following description, given by way of example, of an illustrative machine embodying controlling mechanism 35 according to the invention.

In the drawings,

Fig. 1 is a right-hand side elevation of part of the illustrative machine, embodying a particular form of clutch-controlling mechanism;

Fig. 2 is an enlarged right-hand side elevation, partly in section, of the clutch-controlling mechanism shown in Fig. 1;

Fig. 3 is a plan View of certain parts seen in Fig. 2

Fig. 4 is a front elevation of some of the parts seen in Figs. 2 and 3;

Fig. 5 is a front elevation, partly in section, of the clutch mechanism;

, Fig. 6 is a plan view, partly in section, of a portion of the mechanism shown in Fig. 5;

Fig. '7 is an enlarged section on the line VIIVII in Fig. 2;

Fig. 8 is a side elevation, partly in section, of

one form of treadle mechanism; and

Fig. 9 is a sectional elevation on the line IXI X in Fig. 8.

In the description which follows, reference will be made to the machine disclosed in Letters Patent of the United States No. 1,048,511, Eaton, December 31, 1912, to facilitate an understanding of our invention. In the present machine the low-speed driving mechanism shown in the patent is dispensed with and the machine is driven throughout its cycle at the same speed. The mechanism which effects the return of the knife after it has passed beyond its starting point and the movement of said knife out of engagement with the work are substantially as disclosed in Letters Patent of the United States No. 1,782,494, Woodcock et al., November 25, 1930.

An overhanging arm I extends upwardly and forwardly from the rear of the frame 3 of our improved machine. In the forward end of this arm is mounted a slide II for a clamp I3. The clamp co-operates with the usual stationary pattern 2, about which pattern an operating knife 4 travels to act upon a clamped blank or other work. Power is transmitted to the knife from a driving shaft I5 (Fig. 5). To control the application of power, two hand-levers 5 and I are provided both of which must be actuated, one by the right hand and the other by the left hand of the operator when starting the machine, so that both hands are occupied at this time. The lever 5, which may be termed the starting lever, occupies a position at the right of the machine. The controlling lever I is pivoted at the left of the end 9 of the arm I. The starting lever 5 extends from the rear to the front of the machine and at its forward end has a handle by which it may be operated. It is pivoted at the rear on a fixed horizontal spindle I5 (Fig. 2). Extending upwardly from the hub of the starting lever 5 is an arm II, on the front face of which is secured a hardened block I9. Pivoted on the spindle I5 is a lever L, formed, in part, by a yoke 2| the arms of which engage opposite sides of the hub of the starting lever. The arms of the yoke extend upwardly and are joined by a cross-piece 23 (Fig. 7) which can swing over the arm I! on the starting lever and over the block I9. Rotatably mounted in the arms of the yoke is a latch-pin 25, which is parallel to the spindle I5. This latch-pin has at its under side a gap 24, through which in one rotary position of said pin the block I9 and arm II of the starting lever can freely pass. In another position of the pin,

the block engages it when the starting lever is depressed to start the machine in operation and causes the yoke 2i to move with the lever. The latch-pin, at its. right-hand end, viewing the machine from the front, has secured to it a depending arm 2?, which at its lower end has pivotally connected to it a rearwardly and upwardly extending rod 29. The rod at its rear extremity (Fig. 1) is pivotally connected to an upwardly and forwardly extending arm of a bell-crank lever 33, which is secured on the right-hand end of a horizontal shaft 35 rotatably mounted in a bracket 3i secured to the machine-frame. Fast on the left-hand end of the shaft 35 is an upwardly and rearwardly extending arm 39, which furnishes, in effect, a portion of the lever 33 and to which is pivotally connected a forwardly and upwardly extending rod 4!. The upper end of the rod ll is pivotally connected to a rearwardly and upwardly extending arm 43 secured to a horizontal shaft 45 rotatably mounted in and extending through the frame-arm l behind the forward end 9. Secured to the left-hand end of the shaft 35, outside the frame-arm, is a downwardly extending arm il. The lower end of the arm ll is joined by a rod 49 to the lower extremity of the controlling lever i. This lever is formed in a lower part and an upper part, both pivoted on the same stud 5!. The lower part is connected to the rod 49, while the upper part furnishes a handle. trolling lever are connected for movement together by a spring-plunger, indicated at 53, in one part which enters a recess in the other part. The end 9 of the frame-arm has fixed on it a bracket, from which extends an upward projection close to the upper part of the controlling lever i. Thus the two may be gripped by the left hand of the operator and the handle of the lever i may be moved toward the projection 55 in the actuation of the lever. When the controlling lever is thus actuated, its two parts moving together, the latch-pin 25, through the linkage above described, is rotated in the yoke 2i into such a position that when the starting lever 5 is depressed the yoke 2! is engaged by the block it and is moved with it. In this position of the latch-pin, the pivotal connection between its arm 2'! and the rearwardly and upwardly extending rod 29 is coaxial with the pivot of the starting lever 5 and yoke 2 l. Consequently, when the lever 5 is depressed to start the machine, causing the yoke to be turned about the axis of the spindle E5, the latch-pin is not rotated in said yoke.

The yoke 2i of the lever L has extending downwardly from it an arm 57, which carries at its lower end a roll 59 arranged to engage, in the stopping of the machine, an arm 5! secured on a shaft 53 rotatably mounted in bearings 55, 55 (Figs. 1 and 5) carried by the machine-frame. The shaft '53 has secured on it an arm 55?, to which is articulated a bar 69 having formed on its upper end a wedge-block ll. This block, when the bar 69 is moved upwardly, shifts a driving pulley l3, rotatably mounted on a driving shaft 15 of the machine, into engagement with a clutch member ll fast on the shaft to cause the machine to be driven. The wedge-block H is moved upwardly by a torsion-spring 79 which surrounds a vertical shaft ill. The lower end of the spring '59 is connected to a collar 83 secured on the shaft 8! and its upper end to a collar 85, rotatably mounted on the shaft 8! and -'connected by a pin 8? to a bearing 39 for the shaft at, this bearing being fixed to the machine- Patent No. 1,782,494.

The two parts of the conframe. The collar 85 may be rotated on the shaft 8! to adjust the spring and secured in adjusted position by the engagement of the pin 81 with one of a series of holes 9! in said collar (Fig. 6). The upper extremity of the shaft 8! is journaled in a bearing 93 on the frame. Attached to the shaft 85 is an arm 95, which is joined by a link 91 to an arm 99 secured on theshaft 63. The link 9'1 is connected to the arms 95' and 99 by universal couplings.

If the controlling lever l is released during depress-ion of the starting lever 5, the latch pin 25 will be rotated, as will hereinafter appear, by a spring 98 actuating a brake I99 (Fig. 1) as in This movement of the latch-pin is in a direction to free it from the block 59 on the starting lever 5, and the yoke 2| is then swung by a spring l0! (Fig. 2), connecting the lever L to the frame, in a direction to cause the roll 59 to actuate the arm 6|, thereby preventing the machine from starting or stopping it, if it has been started. The spring I0! is strong enough to overcome the spring 79. The lever L has an arm 99 extending upwardly from the yoke 26 and terminating in a roll I95 carried on a horizontal stud I0 1. The roll, when the arm E63 is swung fully forward by depression of the starting lever 5, passes beneath the lower end'of a catch I99 pivoted upon a horizontal stud l l l secured in a horizontal carrier-lever H3.

This lever is pivotally mounted on the upper end of the vertical shaft 8|. The catch-lever is connected by a rearwardly extending link H5 to an arm ill of the bell-crank lever 33 (Fig. 1) to which the latch-pin 25 is united by the link 29 and the controlling lever 1 by the link 4!, etc. Therefore, when the controlling lever is actuated to rotate the latch-pin 25 into a position where it can be engaged by the block IS on the starting lever 5, the catchor carrier-lever I I3 moves the catch E99 rearwardly about the shaft Bl. This carries the catch to a position in which, when the yoke 2! is moved fully forward by the lever 5 to start the machine, the roll on the arm E93 of the lever L passes beneath the catch and said lever with the yoke M is prevented from being returned by its spring [9L If the controlling lever is released. during operation of the machine, the catch-lever H3 is moved forward by the spring fill. 25, releasing the yoke 2! and stopping the machine. The catch lil9 is pressed by a springplunger H9 against a stop-face [2| on the catchlever H3 and can yield in the opposite direction to allow the roll I95 to pass beneath it. It will then spring back so that it engages the roll and holds the yoke 2i from rearward movement, allowing the starting lever to be released by the operator. The catch-lever has a forwardly extending arm 123, one side of which during the operation of the machine is close to a cam indicated at 25 in Fig. 3, which shows the relative position of the cam and arm just before the machine stops. This cam is secured on the rotary table l2l carrying the knife 4 and extends about one quarter of its circumference. Said cam is so positioned on the table, that during the last quarter of its rotation the catchlever H3 is prevented from being moved by its spring in a direction to release the yoke 2i and stop the machine, even if the controlling lever I has been released during this period.

To start the machine, the controlling lever l is first actuated by the left hand of the operator to rotate the latch-pin 25 into a position where,

This rotates the latch-pin.

when the starting lever is depressed, the block IS can engage said pin. This prepares the clutch-governing lever L for movement. At the same time, the catch-lever I I3 is turned about the shaft 8| into such a position that when the yoke 2i is actuated by the starting lever, the roll I55 will pass beneath the catch I I39 and the yoke will be held by the catch to prevent the clutch from opening. When the starting lever is depressed, the arm 51 of the lever L moves the roll 59 away from the arm BI (as shown in Fig. 2) and allows the spring I9 to shift the pulley 73 into engagement with the clutch member 11. The starting lever 5 can be released immediately the machine has commenced to operate, but by the time the operator could move his right hand into a position where it might be injured by the knife 4 or the knife-carrying mechanism, these will have passed behind the pattern 2, so that there is little danger of injury to this hand. If the left hand of the operator releases the controlling lever I at any time during the first three-quarters of the rotation of the table I2I, the machine will be immediately stopped, as hereinbefore described, and injury to the left hand of the operator is thus prevented. The operator can, because of the action of the cam I25, release the controlling lever I during the last quarter of the rotation of the table and the machine will finish its cycle. During this period there is insufficient time for the operator to move his left hand into the path of the knife or knifecarrier. The ability to release the starting lever and controlling lever at the times above described in the cycle of the machine, enables the operator to be ready to remove the trimmed or cut-out work-piece and to pick up and be ready to place a blank on the pattern, after the work-piece has been removed therefrom, while the machine is in operation. If the starting lever 5 is depressed before the controlling lever I has been operated, the block I9 will pass idly through the gap 2 in the latch-pin 25 and the machine will not be started. When the starting lever is thereafter released, it is raised by a spring 6 connected to it and to the arm I53 of the lever L until a screw 8 in the starting lever engages the yoke 2 I.

The machine is stopped automatically at the end of its cycle by a stop-cam indicated at I29 (Fig. 3) on the table I2I, which cam engages a rearwardly extending arm I3! of a st6p-lever I33 pivoted on the shaft BI just below the catchlever H3. The stop-lever and the catch-lever are connected by a toggle I35. This toggle has been straightened, by a spring-plunger I37 in the stop-lever engaging one of the links of the toggle, when the stop-cam I29 engages the arm I3I. The straightened toggle I35 moves the catch-lever H3 in a clockwise direction (Fig. 3) to release the roll I05 from the catch I09 and, through the rod H5, bell-crank lever 33 and rod 29, shifts the latch-pin 25 to release the yoke 2! from the block I9 so it can be moved by its spring Ifil in a direction to stop the machine. When the stop-cam I29 engages the arm I3I on the stop-lever I33, the cam I25 on the rotary support which controls the catch-lever II3 has traveled past that lever and therefore allows it to be moved with the I stop-lever. If the machine should stop with the cam I29 in engagement with the lever I33, movement of the catch-lever in an anti-clockwise direction (Fig. 3) and the latchpin 25 by the controlling lever I, toenable the machine to be started by the lever 5, will be pre vented by said cam. To enable the controlling lever I to be actuated under these circumstances, one of the toggle-links has extending from it an arm I39. This arm the operator can actuate with the thumb of his right hand when holding the starting lever 5, and by it the toggle I35 can be broken and held in this condition while the operator with his left hand actuates the controlling lever I. Thus, the latch-pin 25 may be rotated to move the catch-lever into a position where the roll I95 on the upper end of the yokearm I 03 will pass under and be held by the catch I09 when the yoke 2| is actuated by the starting lever.

In the illustrative machine the brake mechanism, which is otherwise substantially similar to that disclosed in Patent No. 1,782,494, is controlled by connections to the lever I instead of by the starting lever. In the present apparatus, a lever I 33 (Fig. 1), corresponding to the brakelever of the patent, has a downwardly extending arm MI. This arm is connected by a forwardly extending link M3 to the latch-pin-arm 21, so that when the controlling lever I is actuated to rotate the latch-pin 25 the brake IIJI) is removed, and when the controlling lever is released or the machine is automatically stopped at the end of its cycle, the brake is applied by its spring 98.

It has been hereinbefore stated that the controlling lever I is formed in two parts, which may be moved together or relatively. The reason for this is that if the operator holds said lever until the machine is automatically stopped at the end of its cycle, his hand would be jarred by the action of the stop-cam I29 when it engages the stop-lever I33. When this occurs, the plunger 53 allows the lower part of the controlling lever to move relatively to the upper part, then gripped by the operator, and, after such relative movement, the operator must move the upper part to reengage the plunger and recess.

In the present machine, treadle mechanism is provided (Figs. 8 and 9) for moving the clamp I3 into engagement with the blank or article on the pattern 2, without undue movement of the operators foot, and for producing an adequate clamping action, without heavy pressure on the treadle. The mechanism for actuating the clamp comprises a two-part treadle-lever pivoted on a horizontal shaft I5I extending across the machine on a bracket I53 secured to the frame 3. The front section I55 of the lever is arranged to be depressed by the operator, and the rear section I5'I is connected, through mechanism hereinafter described, to a rod I58 joined to a clampactuating lever I59 (Fig. 1), which is acted upon by a spring I60 to raise the clamp. The sections of the treadle-lever have co-operating stop-faces IBI, normally held in contact by a spring I63 joining the treadle-sections but which may be separated by depression of the front section. The rear end of the section I5I has pivotally connected to it the lower extremity of a pair of upwardly extending toggle-links I 65, I61. The upper-end of the toggle-link I 6! is joined to the central portion of a lever I69 fulcrumed at III on the bracket I53 and guided by a fork I93 rising from said bracket. To the free end of the lever the rod I58 is connected. The relation of the lever-arms is such that a comparatively small movement of the operators foot carries the clamp into engagement with the blank. The rod I58 is formed in two parts, there being a spring II3 between them to provide a yielding link between the toggle and the clamp. The center I19 of the toggle I65, I 61 is connected by a forwardly extending link I15 to an arm i 'll projecting upwardly from the inner extremity of the section E55 of the treadle-lever. When the front part I55 of the treadle-lever is raised, the toggle is broken rearwardly by the spring N33 acting through the link. The rear of the treadle-section l5? has pivoted on it a pair of depending pawls ltl, l8! arranged to engage the teeth of a ratchet-blook l 3 secured on the bracket 553. The pawls are of unequal length, so that when one of them is in engagement with a tooth of the block the other is engaging the block half way between two adjacent teeth. The teeth of the ratchet-block are so disposed that, when one of the pawls is in engagement with them, the rear of the treadlelever is locked against downward movement. The pawls are moved by spring-plungers I85 into engagement with the ratchet-teeth, and have upwardly projecting arms it? for engagement with an adjustable screw 989 projecting through a lug it! on the under side of the link H5. When the treadle is raised and the toggle is broken, the pawls are held clear of the ratchet-teeth by the screw i851.

When the treadle is depressed, its two sections move about their pivot l5l together, the spring its connecting them being stronger than the spring 560 which raises the clamp l3, and said clamp is moved into contact with the article on the pattern 2. At this time the toggle is moved bodily in the broken relation illustrated in Fig. 8, the angular relation between its links. M55 and it'd not being altered. Upon this engagement with the work, upward movement of the rear end of the section 951 of the treadle-lever is resisted, and further depression causes the section it? to swing on its pivot l5! relatively to the rear part. During this movement, the link H5 is shifted forwardly, and the screw H89 in the link moves away from the arms I87 on the pawls and allows one of the pawls: to engage the ratchet H83. Downward movement of the rear of section l 51 is thus resisted during continued depression of the section l55. When this occurs, the link H5 straightens the toggle I65, I61 and pressure is applied through the leverage thereof to the rod l 58 to clamp the work on the pattern. The spring H3 between two parts of the rod is compressed during the straightening of the toggle, and this spring exerts the clamping pressure on the work. Therefore, this pressure is always substantially uniform for different work-thicknesses, since the combined movement of the two parts of the treadle-lever measures the thickness of the material, and the subsequent straightening of the toggle always compresses the spring 5 13 by about the same amount. The straightening of the toggle to apply the clamping pressure requires no undue exertion on the part of the operator, and the effort required by the operator to keep the toggle straightened during the operation of the machine is only that needed to overcome the tension of the spring M3. When the operator releases the treadle, the spring H63 raises the section m5 of the treadle-lever and breaks the toggie, thereby relieving the pressure of the clamp on the work-pieceoperated upon. Toward the end of the upward movement of the lever-section i555, after the toggle has been broken, the pawls are withdrawn from the ratchet-block E83 by engagement of the screw E83 and the spring ltd raises the clamp-plate I 3 and lowers the rear end of the treadle, the sections of which now move together.

Having thus described our invention, what we claim as new and desire to secure by Letters Patent of the United States is:

l. The combination with operating mechanism, of driving mechanism therefor, a device movable to govern the connection of the driving mechanism to the operating mechanism, two controlling members both of which must be actuated by an operator to cause the connecting action of the device, and means whereby the controlling effect of one of the members may be maintained during a portion only of an operating cycle if said member is released by the operator.

2. The combination with operating mechanism, of driving mechanism therefor, a device movable to govern the driving mechanism, two members for actuation by an operator, the movement of one member preparing the device for movement by the other member, and a catch for retaining the device in the position to which it is moved.

3. The combination with operating mechanism, of driving mechanism therefor, a device movable to govern the driving mechanism, two members for actuation by an operator, the movement of one member preparing the device for movement by the other member, a catch for retaining the device in the position to which it is moved, and connections between the preparing member and the catch for placing said catch in its retaining relation.

4. The combination with operating mechanism, of driving mechanism therefor, a device movable to govern the driving mechanism, two members for actuation by an operator, the movement of one member preparing the device for movement by the other member, a catch for retaining the device in the position to which it is moved, connections between the preparing member and the catch for placing said catch in its retaining relation, and means movable with the operating mechanism for temporarily maintaining such relation.

5. The combination with operating mechanism, of driving mechanism therefor, a device movable to govern the driving mechanism, two members for actuation by an operator, the movement of one member preparing the device to receive con- 6. The combination with operating mechanism,

of driving mechanism therefor, a device movable to govern the driving mechanism and including a lever provided with opposite arms and a latch rotatable upon one of the arms of the lever, a member for actuation by an operator, a link connecting the member to the latch to rotate said latch, and a member for actuation by the operator to engage the latch and shift the lever to causethe arm opposite the latch-arm to actuate the driving mechanism.

7. The combination with operating mechanism, of driving mechanism therefor, a device movable to govern the driving mechanism and including a lever and a latch movable upon the lever, a controlling member for actuation by an operator to move the latch, a starting member for actuation by the operator to engage the latch and shift the lever, and a catch movable by the controlling member for engagement by the lever.

8. The combination with operating mechanism, of driving mechanism therefor, a device movable to govern the driving mechanism and including a lever and a latch movable upon the lever, a controlling member for actuation by an operator to move the latch, a starting member for actuation by the operator to engage the latch and shift the lever, a catch movable by the controlling member for engagement by the lever, and a member movable by the operating mechanism for holding the catch in its lever-engaging position independently of the controlling member.

9. The combination with operating mechanism, of driving mechanism therefor, a device movable to govern the driving mechanism and including a lever and a latch movable upon the lever, a controlling member for actuation by an operator to move the latch, a starting member for actuation by the operator to engage the latch and shift the lever, a catch movable by the controlling member for engagement by the lever, and a brake for the driving mechanism movable by the controlling member.

10. In a rounding machine, a pattern, a knife movable about the pattern, driving mechanism by which the knife is moved, and two levers, both of which must be held actuated by an operator to cause movement of the knife by the driving mechanism.

11. In a rounding machine, a pattern, a knife movable about the pattern, driving mechanism by which the knife is moved and including a clutch, a clutch-governing lever, a starting lever for shifting the governing lever, and a controlling lever for determining the active or inactive relation between the starting lever and governing lever.

12. In a rounding machine, a pattern, a knife movable about the pattern, driving mechanism by which the knife is moved and including a clutch and a brake, a clutch and brake-governing lever, a starting lever for shifting the governing lever, and a controlling lever for determining the active or inactive relation between the starting lever and governing lever.

13. In a rounding machine, a pattern, a knife movable about the pattern, driving mechanism by which the knife is moved and including a clutch, a clutch-governing lever, a starting lever for shifting the governing lever, a controlling lever for determining the active or inactive relation between the starting lever and governing lever, and a catch movable by the controlling lever for retaining the governing lever in its clutch-governing position.

14. In a rounding machine, a pattern, a knife movable about the pattern, driving mechanism by which the knife is moved and including a clutch, a clutch-governing lever, a starting lever for shifting the governing lever, a controlling lever for determining the active or inactive relation between the starting lever and governing lever, a catch for retaining the governing lever in its clutch-governing position, and a cam movable with the knife and holding the catch in its retaining relation.

15. In a rounding machine, a pattern, a knife movable about the pattern, driving mechanism by which the knife is moved and including a clutch, means for producing engagement of the clutch, and means movable with the knife and eifective during a portion of its travel about the pattern to maintain such engagement of the clutch.

16. In a rounding machine, a pattern, a knife movable about the pattern, driving mechanism by which the knife is moved and including a clutch, a lever movable to govern the engagement of the clutch, and a cam movable with the knife and acting to temporarily maintain such engagement.

17. The combination with driving mechanism,

including a clutch, of a lever movable to govern engagement of the clutch, a latch movable upon the lever, an arm projecting from the latch and extending to the fulcrum of the lever, a controlling lever, connections from the latch-arm at a point substantially alined with the fulcrum of the governing lever and extending to the controlling lever, and a starting lever movable by the operator into engagement with the latch.

18. The combination with operating mechanism, of driving mechanism therefor, a member movable to render the driving means effective, a catch controlled by an operator for retaining the member in its active position, means movable by the operating mechanism for efiecting such retention independently of the operator, and means whereby the operator may render the last-mentioned retaining means ineffective.

19. The combination with operating mechanism, of driving mechanism therefor including a clutch, a member movable to cause the engagement of the clutch, a catch by which the member may be retained in its active position, a lever by which the operator may move the catch to render it effective, a cam movable by the operating mechanism and acting upon the catch to maintain its effectiveness, and means movable by the operator to release the catch from the cam.

20. The combination with operating mechanism, of driving mechanism therefor including a clutch, a member movable to cause the engagement of the clutch, a catch controlled by an operator for retaining the member in its active position, a lever movable by the operator to set the catch for such retention, a lever movable by the operating mechanism to hold the catch thus set, and means movable by the operator for nullifying the effect of the last-mentioned lever.

21. The combination with operating mechanism, of driving mechanism therefor including a clutch, a member movable to cause the engagement of the clutch, a catch controlled by an operator for retaining the member in its active position, a lever movable by the operator to set the catch for such retention, a lever movable by the operating mechanism to hold the catch thus set, and a toggle connecting the levers, one of said levers being provided with an extension for manipulation by the operator to break the toggle.

22. The combination with operating mechanism, of driving mechanism therefor, a lever which must be held by the operator during a portion of an operating cycle to cause the driving of the operating mechanism, and means movable by the operating mechanism to maintain the driving action, the lever being formed in relatively yieldable sections, one section being connected to the driving-maintaining means and the other arranged to be grasped by the operator.

23. The combination with operating mechanism, of driving mechanism therefor, a governing lever for the driving mechanism, a catch for retaining the governing lever, a movable carrier for the catch, a controlling lever provided with a section joined to the carrier and a second section arranged to be grasped by the operator to hold the catch in retaining position, the two lever sections being relatively movable, a spring device connecting the sections, and a cam movable by the operating mechanism and acting upon the carrier to hold the catch in retaining position.

JOSEPH GOULDBOURN. HAROLD ERNEST ELLIOTT.

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