US2240616A - Machine for applying pressure to shoe bottoms - Google Patents

Description

May 6, 1941. c. J. c-moss 2,240,616

MACHINE FOR APPLYING PRESSURE To SHOE BOTTOIS Fiied Jan. 13, 1940 s Sheets-Sheet 1 C. J. GROSS MACHINE FOR APPLYING PRESSURE T0 SHOE BOTTONS Filed Jan. 15, 1940 S Sheets -Sheet 2 y 6, 9 c. J. GROSS 2,240,616

MACHINE FOR APPLYING PRESSURE T0 SHOE BOTTOHS Filed Jan. 15, 1940 3' Sheets-Sheet 3 (@103. M Kf Patented May 6, 1941 I MACHINE FOR APPLYING PRESSURE TO SHOE BOTTOMS Charles J. Gross, Melrose, Mass, assignor to United Shoe Machinery Corporation,

Borough of Flemington, N. .1., a. corporation of New Jersey Application January 13, 1940, Serial No. 313,712

16 Claims.

This invention relates to machines for use in the manufacture of shoes and is illustrated herein as embodied in a machine for applying pressure to shoe bottoms.

One Well-known type of machine for use in applying pressure to shoe bottoms is illustrated in Letters Patent of the United States 2,047,185 granted July 14, 1936, on an application of M. H. Ballard et al. In machines of this type a pad is provided for supporting a sole and shoe during the pressing operation. A swingable frame carries toe and heel abutments for engaging the toe portion of the shoe and the cone of the last respectively, the toe and heel abutments being carried by arms which are mounted on' vertically slidable rods in the swingable frame. Prior'to a pressing operationfthe frame is in a position rearward of the pad to facilitate the positioning of the shoe and sole thereon; 'The frame is then swung manually to a position in' which the toe and heel abutments are directly over the shoe and pressure is then applied to the arms carrying the abutmeh-ts to pressthe shoe "against the sole supported on the pad. Thetoe and heel abutments are arranged to occupy positions slightly above the toe portion of the shoe and the cone of the last respectively prior to the application of pressure to the arms upon which they are carried.

While machines of the type illustrated in this -patent are Well adapted for use on low shoes,

some difliculty has been experienced when operating on high shoes such as mens work shoes.

The uppers of these shoes extend a considerable distance above the cone of the last so that it is generally necessary for the operator to hold the upper outward and downward away from the cone of the last as the swing-able frame is moved to a position in which the heel abutment is directly over the cone to prevent interference between "this abutment and the upper. This operation of the provision of a machine for applying pressure to shoe bottoms wherein the machine is equally well adapted for use with high or low shoes and in which danger of interference between the upper and the pressure applying means when a high shoe is being acted upon is greatly reduced.

and illustrated in the accompanying In accordance with the present invention, the heel abutment through which pressure is applied to the cone of the last is mounted for vertical movement with respect to the vertically movable arm by which it is supported. This arm is spring biased vertically upward to such a height that there will be no interference between the heel abutment and the upper as the frame is swung forwardly to position the abutments over the shoe. The heel abutment is then moved downwardly with respect to the arm by which it is supported, by the operator, until it is in' proximity to the con-e of the last. The vertical movement of the heel abutment to this position may be effected without any danger of engaging the upperof the shoe. Pressure is then applied to the arms -carrying the heel and toe abutments to press the shoe against the sole supported on the pad. During the initial part of the pressure-applying movement of the arm carrying the heel abutment, a pawl is operated to lock the heel abutment against vertical movement with respect to the arm by which it is carried so that it will not be moved upwardly by its spring. Upon release of the pressure, the-arms carrying the abutments move upwardly with respect to the swinging frame and the pad under the influence of a pair of springs and after the arm carrying the heel abutment has moved to its uppermost position, the aforementioned pawl is released to'permit further upward movement of the heel abutment with respect to its supporting arm, thus carrying the heel abutment vertically above the top of the upper. The swingable frame may now move rearwardly without interference between the heel abutment and the upper so that the shoe may be removed from the pad and another shoe and sole placed thereon. The provision of a pawl operated in the manner described above forms another feature of the present invention. r

In accordance with a further feature of the present invention, the means by which downward movement is imparted to the heel abutment with respect to its supporting arm is located in close proximity to a handle attached to the swinging frame so thatthe operator, by grasping this handle, may swing the frame forwardly and with his thumb may then move the heel abutment downwardly while holding the frame in its forward position so that both of these operations may be carried out by the use of one hand.

These and other features of the invention will now be described in detail in the specification drawings, in which levers about the shaft 46.

Fig. 1 is a front elevation of a portion of one form of machine embodying the principles of the present invention;

Fig. 2 is a sectional view taken on the line II--II of Fig. 1;

Fig. 3 is a side elevation of the machine illustrated in Fig. 1;

Fig. 4 is a rear view of a part of the mechanism illustrated in Fig. 1, showing the hydraulic cylinder and the connections to the arms carrying the heel and toe abutments;

Fig. 5 is a plan view of the machine shown in Fig. 1;

Fig. 6 is a sectional view VIVI of Fig. 5; and

Fig. 7 is a sectional View taken on the line VIIVII of Fig. 5.

' A pad box provided with gage'mechanism for properly positioning a shoe and sole on the pad similar to that illustrated in Letters Patent of taken on the line the'United States No. 2,145,265, granted January 31 1939. on an application of L. G. Knowles is represented generally by the reference character I6. Located rearwardly of the pad box is a hydraulic cylinder I2 (Figs. 3 and. 4) by mean-s of which pressure is applied to the shoe to press the same against the sole sup-ported on the pad by mechanism to be described. A pressure distributing device I4 (Fig. 4) is connected to a piston I6 in the cylinder I2, this pressure distributing device operating to cause equal pressures to be applied to the forepart of the shoe and the cone of the last as described in the Ballard et a1. patent.

The pressure distributing device I4 includes an equalizer lever I! provided at the Opposite ends thereof with spherical bearings I8 and 26. Surrounding the bearings I8 and 26 are the forked ends of arms 22 and 24, respectively, the lower ends of these arms being provided with straps 26- and 28 underlying the bearings I8 and 26 and securing the arms thereto. The upper ends of the arms 22 and 24 are similarly connected to bearings 36 and 32 mounted in the forked rearward ends of levers 36 and 38. The levers 36 and 36 are fulcrumed on a shaft 46 (Figs. 1

and 3) which is in turn mounted in vertical arms 42 and 44 pivotallyconnected at 46 to the frame of the machine. These arms are movable from the full line position to the broken line position of Fig. 3, their movement being limited by means of a rod 48 carried by them and slidable through a lug 56 carried by the side of the cylinder. I2. Nuts 52 and 54 carried by the rod 48 on opposite sides of the lug 56 cooperate therewith to limit the movements of the arms 42 and 44 about the pivot 46. 7

A crosshead 56 is connected to the upper ends of the arms 42 and 44 and providesv bearings for the upper ends of vertically slidable shafts 66, 62. The lower ends of these shafts are slidably mounted in a second crosshead 64 (Fig. 3) carried by the lower ends of. the arms 42 and 44. The arms 42 and 44 and the crossheads form a swingable frame by means of which the heel and toeabutments are supported in a manner to be described. Screws 66 carried by the'crOsshead 56 cooperate with the levers 36 and 38 adjustablyto limit clockwise movement of these Movement of the levers in the opposite direction is adjustably limited by meansof screws 68 carried by the crosshead 56.

connected to the upper part of a frame member 16, the rearward part of which is secured to the rod 62. A spring II (Fig. 1) surrounding the rod 62 acts between the lower crosshead 64 and the lower rearward part of the frame member I6 to urge this member and the rod 62 upwardly. A 'T-slot I2 formed in the lower part of the frame member 16 forms a way for a slide member 14 carrying a toe abutment 16. The slide 14 is connected by means of a bell crank lever 18 pivoted at 86 to the lower part of the frame member I6 to a link 82 which is in turn connected to an arm 84 movable with a handle 86. The handle 86 is mounted for pivotal movement about a shaft 68 (Fig. 1) in the end of an arm 96 fixed to the rod 66. This handle serves as means for adjusting the toe abutment I6 longitudinally of the pad box by pivotal movement of the handle and also serves to enable pivotal movement of the arms 42 and 44 about the pivot 46 by the operator.

' An arm 94 is secured to the rod 66, the forward end of this arm being fastened by a pin and slot connection to the forward end of the lever 38. This rod 66 is urged upwardly by means of a spring 66 acting between the crosshead' 64 and the arm 96 fixed to the rod 66. The forward end. of the arm 94 is provided with a Tv-slot 98 forming a guideway for a slide I66 for'permitting adjustment of this slide longitudinally of the pad box. A rod I62 is carried for vertical sliding movement by the slide I66, the downward movement of the rod I62 with respect to the slide being limited by a collar I64 which is arranged to engage the upper end of the arm 94 upon sufficient downward movement of. the rod with respect thereto. The collar I64 is adjustably connected to the upper end of the rod I62 by means of a screw I66 arranged to engageany one of a plurality of circular recesses I68 arranged in the upper part of the rod. The

rod I62 is urged upwardly with respect to. theslide I66 by means of a spring II6 the upper end of which is connected to the horizontally extending portion of an arm II2, the lower end of this arm being mounted in a laterally extending portion of the slide I66. The lower end of the spring is connected to the bottom of a bore extending partially through the rod I62. Upward movement of the rod I62 with respect to the slide I66 is limited by means of a member H4 (Figs. 6 and 7) mounted on the lower end of the rod and engaging the under side of the slide I66 upon sumcient upward movement of the rod I62. The member II4' includes a pair of spaced depending arms II6 between which is nivotally connected a heel abutment II 8 which is. in fact, arranged to engage the cone of a last. Springs I26 positioned between the heel abutment H6 and the member II4 act to maintain the lower surface of the heel abutment in a horizontal position while permitting pivotal movement of the heel abutment with respect to the member H4.

The rear side of the rod I62 is provided with rack teeth I2! with which engage the teeth of a gear I 22 mounted for rotation in the slide I66. A gear I24 (Fig. 3) fast with the gear I22 meshes with the teeth of a rack member I26 arranged for horizontal sliding movement in the lower portion of the slide I66. The rearward end of the rack member I26 has connected thereto a laterally extending arm I26 to which is connected an arm I36 extending forwardly of the machine and terminating in a thumb piece I32.

A cover member I34 attached to the slide I66 encloses the gear I24 and most of the rack meniber I26. Upon sliding'movement of the rack I26 with respect to the slide I00, the gear I24 is rotated which in turn causes rotation of the gear I22 and vertical movement of the rod -I02 carrying the heel abutment II8. If the rack member 'I26 is moved rearwardly, the rod I02 is moved downwardly against the force of the spring I I0 tending to move the rod I02 upwardly. The thumb piece I32, bymeans of which motion is imparted to the rack member I26, is positioned adjacent to the handle 86 and is arranged to be actuated by the thumb of the right-hand of the operator, the fingers of which are simultaneously grasping the handle 86 to hold the arms 42 and 44 in their forward or full line positions (Fig. 3).

The rod I02 is also provided with ratchet teeth I40 (Figs. 1 and 7) which are arranged to be engaged by a pawl I42 pivoted to the slide I 00 for holding the rod I02 in its downward posi tion with respect to the'slide against the force of the spring IIO. The pawl is pinned to a horizontally extending shaft I44 which projects from the slide I00 and carries at its outer end an arm I46 which is urged in a counter-clockwise direction, as viewed in Fig. 1, by means of a compression spring I48 engaging the under side of the arm I46, the lower end of which spring is seated in a recess of a projection I50 on the forward part of the slide I 00 (Fig. 6). The spring I 40 acts to move the pawl I 42 into engagement with the teeth I40 to prevent vertical movement of the rod I02 with respect to the slide member I00 under the influence of the spring I00.

A rod I54 (Figs. 1, 3 and 6) is carried for vertical movement in a forwardly projecting portion of the arm 94. A pin I56 carried by the rod I 54 cooperates with a slot I 58 in the front of the arm 94 for limiting Vertical movements of the rod I54. A plate I60 carried by the lower end of the rod I54 is arranged to engage a forwardly projecting portion of the arm I46 for moving this arm in a direction to disengage the pawl I42 from the ratchet teeth I 40 in the rod I02 upon downward movement of the rod I 54 relative to the arm 94, or into the position illustrated in Fig. 6.

The crosshead 56 is provided with a forwardly extending arm I62 in the front end of which is threaded a screw !64, this screw being provided with a lock nut I66 for securing the screw I 64 in adjust-ed position in the arm I62. The lower end of the screw I64 is arranged to engage the upper end of the rod I54 as the arm 94 carrying the slide I 00 moves upwardly under the force of the spring 96 to the position illustrated in Figs. 3 and 6. As the arm moves upwardly, the upper end of the rod I54 is moved downwardly with respect thereto after the upper end thereof has engaged the screw I64. This downward movement of the rod I54 with respect to the arm 94 causes the pawl I42 to move into the position shown in Fig. 7 thus permitting vertical movement of the heel abutment carrying rod I02 relatively to the slide I00 under the force of the spring I I0. As the arm 94 moves downwardly by reason of the movement imparted to the lever 38 by the piston I6 in the hydraulic cylinder I2, the upper end of the rod I54 moves away from the screw I64 whereupon the compression spring I48 moves the outer end of the arm I46 upwardly causing a similar movement to be imparted to the rod I54 and moving the from the screw I 64 pawl I42 into locking engagement with the teeth I40 in the rod I02 to hold this rod in the position to which it has been moved by the operator against the force of the spring I I0.

At the beginning of a pressing operation,. the vertical arms 42 and 44 will be in their rearward positions as illustrated by the broken lines in Fig. 3 so that the heel and toe abutments and associated mechanism will be positioned rearwardly of the pad box I0. There is, accordingly, no interference from these parts to the proper positioning of the shoe and sole upon the pad box. After the shoe S (Fig. 1-) having a last L therein and a sole have been properly positioned on the pad, the arms 42 and 44 are brought forwardly by the operator by moving the handle 86 so that the toe and heel abutments are positioned vertically over the shoe. At this time the toe and heel abutments will be substantially in the positions shown in Fig. 1 with the heel abutment above the heel portion of the upper so that there is no interference between this heel abutment and the upper as the heel abutment is moved to this position, even when the shoe supported on the pad is a high shoe as illustrated. Adjustment of the toe abutment lengthwise of the shoe may be effected by rocking the handle about the pivot 88. The operator keeps the fingers of his right hand on the handle 86 so that the arms 42 and 44 will be maintained in their vertical positions and, with the thumb of the same hand on the thumb piece I32, moves the rack member I26 rearwardly which causes downward movement of the rod I02 and with it the slide I00 and the heel abutment H8 until the collar I04, carried by the rod I02, engages the top of the arm 94. The collar I04 will preferably be adjusted on the rod I02 so that the rod will be moved downwardly with respect to the arm 94 the desired distance with the heel abutment adjacent to the cone of the last. The left hand of the operator is available at this time to spread the top of the upper slightly if necessary to prevent engagement of the heel abutment therewith but since the movement imparted to the heel abutment upon entering the upper is a vertical one, very little and in many cases no spreading of the upper by the operator will be required.

Power is now applied to the levers 36 and 38 to move the arms 92 and 94 downwardly to apply pressure to the shoe and the sole through the toe and heel abutments. Upon initial downward movement of the arm 94, the rod I54 moves away so that the spring I48 is effective to move the pawl I42 into locking engagement with the heel abutment carrying rod I02 to lock this rod to the arm 94. Since a greater part of the downward movement of the heel abutment is effected manually, the piston I6 in the hydraulic cylinder I2 need not travel any farther than in a machine of the type shown in the Ballard et al. patent although interference between the top of the upper and the heel abutment during movement of this abutment forwardly from its rearward position is entirely elimi nated.

At the conclusion of the pressing operation, the piston I6 moves downwardly in th cylinder I2, thus moving the levers 36 and 38 in a clockwise direction as viewed in Fig. 3 to permit upward movement of the arms 92 and 94 by their associated springs. After the arm 94 has moved up sufficiently, the rod I54 will engage the screw I64 and the arm will move upwardly with respect thereto so that the pawl. I42 is moved out of en- 'agement with the ratchet teeth in the rod I02. The rod is now free to move upwardly with respect to the arm 94 under the force of the spring I ill. The heel abutment will therefore move to a position above the top of the upper so that the arms 42 and 44 may move rearwardly carrying the toe and heel abutments with them without any interference between the heel abutment and the upper during this rearward movement.

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

1'. In a machine. for applying pressure to shoe parts, a pad for supporting a sole against which a. shoe is to be pressed, a member for pressing a shoe against a sole supported on said pad, a heel abutment slidably carried by said member for movement toward and away from said pad, means urging said heel abutment away from said pad, and means operative in response to movement of said member in pressure-applying direction for locking said heel abutment to said member for movement therewith.

2. In a machine for applying pressure to shoe parts, a pad for supporting a sole against which a shoe is to be pressed, a member for pressing a shoe against a sole supported on said pad, a heel abutment slidably carried by said member for movement toward and away from said pad, means I operative in response to movement of said member in pressure-applying direction for locking said-heel abutment to said member for movement therewith, and means for releasing said locking means in response to movement of said member in I pressure-releasing direction.

3,. In a machine for applying pressure to shoe parts, a pad for supporting a sole against which a shoe is to be pressed, a member for pressing a shoe against a sole supported on said pad, a heel abutment slidably carried by said member for movement toward and away from said pad, means for locking said heel abutment for movement with said member in pressure-applying direction, and means for releasing said locking means in response to movement of said member in pressure-releasing direction.

4. In a machine for applying pressure to shoe parts, a pad for supporting a heel against which a shoe is to be pressed, a member for pressing a shoe against a sole supported on said pad, a heel abutment slidably carried by said member for movement toward and away from said pad, a spring urging said heel abutment upwardly with respect to said pad and said member, means for locking said heel abutment to said member for movement therewith in pressure-applying direction, and means for releasing said locking means 7 in response to movement of said member in pressure-releasing direction.

' 5. In a machine for applying pressure to shoe parts, a pad for supporting a sole against which a shoe is to be pressed, a member for pressing a shoe against a sole supported on said pad, a heel abutment slidably carried by said member for movement toward and away from said pad, means operative in response to movement of said member in pressure-applying direction for locking said heel abutment to said member for movement therewith, and a spring acting to move said heel abutment relative to said member away from said pad.

6. In a machine for applying pressure to .shoe parts, a pad for supporting a sole against which a shoe is to be pressed, a member for pressing a shoe against a sole supported on said pad, a heel abutment slidably carried by said member for movement toward and away from said pad, means operative in response to movement of said member in pressure-applying direction for locking said heel abutment to said member for movement therewith, means for releasing said locking means in response to movement of said member away from said pad, and means for urging said heel abutment away from said pad relative to said member.

7. In a machine for applying pressure to shoe parts, a pad for supporting a sole against which a shoe is to be pressed, a member for pressing a shoe against a sole supported on said pad, a rod slidably carried by said member for movement toward and away from said pad, a heel abutment carried by the end of said rod adjacent to the pad, a collar adjustably carried by said rod and cooperating with said member for limiting the slidable movement of said rod relative to said member toward the pad, and means operative in response to movement of said member in pressureapplying direction for locking said rod to said member for movement therewith.

8. In a machine for applying pressure to shoe parts, a pad for supporting a sole against which a shoe is to be pressed, a member for pressing a shoe against a sole supported on said pad, a rod slidably carried by said member for movement toward and away from said pad, a heel abutment carried by said. rod at the end adjacent to said pad, a spring urging said rod for slidable movement with respect to said member away from said pad, a collar adjustably carried by said rod and cooperating with said member for limiting movement of said rod with respect to said member toward the pad, means operativein response to movement of said member in pressure-applying direction for locking said rod sponse to movement of said member in pressurereleasing direction whereby said spring is effective to move said rod relative to said member away from said pad.

9. In a machine for applying pressure to shoe parts, a pad for supporting a sole against which a shoe is to be pressed, a member for pressing a shoe against a sole supported on said pad, a rod slidably carried by said member for movement toward and from said pad, a heel abutment carried by said rod at the end adjacent to said pad, a pawl connected to said member and arranged when moved in one direction to lock said rod to said member for movement therewith, a spring tending to move said pawl into locking position,

means for holding said pawl out of locking position, and means for releasing said holding means to permit movement of said pawl into locking position upon initial movement of said member in pressure-applying direction.

10. In a machine for applying pressure to shoe parts, a pad for supporting a sole against which a shoe is to be pressed, a member for pressing a shoe against a sole supported on said pad, a rod slidably carried by said member for movement toward and away from said pad, a heel abutment carried by said rod at the end adjacent to said pad, said rod being provided with rack teeth extending along the length thereof, a gear carried by said member, said gear being engageable with said rack teeth, means for rotating said gear to move said rod relative to said member, aspring acting to move said rod relative to said member away from said pad, and means operative in response to movement of said member in pressureapplying direction to lock said rod to said member for movement therewith.

11. In a machine for applying pressure to shoe parts, a pad for supporting a sole against which a shoe is to be pressed, a member for pressing a shoe against a sole supported on said pad, a rod slidably carried by said member for movement toward and away from said pad, a heel abutment carried by said member at the end adjacent to said pad, a spring connected to said rod and arranged to move said rod relatively to said member away from said pad, said rod being provided with rack teeth, a gear connected to said member, said gear being engageable with said rack teeth and arranged upon rotation thereof to cause said rod to move toward said pad against the action of said spring, and a collar adjustably carried by said rod and cooperating with said member to limit movement of said rod by said gear toward said pad.

12. In a machine for applying pressure to shoe parts, a pad for supporting a sole against which a shoe is to be pressed, a member for pressing a shoe against a sole supported on said pad, a rod slidably carried by said member for movement toward and away from said pad, a heel abutment carried by said member at the end adjacent to said pad, a spring connected to said rod and arranged to move said rod relative to said member away from said pad, said rod being provided with rack teeth, a gear connected to said member, said gear being engageable with said rack teeth and arranged upon rotation thereof to cause said rod to move toward said pad against the action of said spring, a collar adjustably carried by said rod and cooperating with said member to limit movement of said rod by said gear toward said pad, and means operative in response to movement of said member in pressure-applying direction to lock said rod to said member for movement therewith.

13. In a machine for applying pressure to shoe parts, a pad for supporting a sole against which a shoe is to be pressed, a member for pressing a shoe against a sole supported on said pad, a heel abutment slidably carried by said member for movement toward and away from said pad, means supporting said member for bodily movement from a position in which the heel abutment is positioned directly over said pad to a position in which the heel abutment is out of vertical alinement with said pad, a handle by means of which said member is moved into a position in which the heel abutment is positioned directly over said pad, and means for moving said heel abutment vertically with respect to said member and said pad, said means including an actuating member positioned sufficiently close to said handle to be engaged by the thumb of the hand of the operator, the fingers of which are simultaneously grasping said handle.

14. In a machine for applying pressure to shoe parts, a pad for supporting a sole against which a shoe is to be pressed, a member for pressing a shoe against a sole supported on said pad, a heel abutment slidably carried by said member for movement toward and away from said pad, a toe abutment for engaging the toe of a shoe supported on said pad, means for adjusting said toe abutment longitudinally of the pad, said means including an actuating handle adapted to be gripped by the fingers of a hand of the operator, and means for moving said heel abutment vertically with respect to said member, said means including an actuating member positioned sufliciently close to said handle to be engaged by the thumb of the hand of the operator while the fingers thereof are grasping said handle.

15. In a machine for applying pressure to shoe parts, a pad for supporting a sole against which a shoe is to be pressed, a member for pressing a shoe against a sole supported on said pad, a rod slidably carried by said member for movement toward and away from said pad, a heel abutment carried by said member at the end adjacent to said pad, a spring connected to said rod and arranged to move said rod relative to said member away from said pad, said rod being provided with rack teeth, agear connected to said member, said gear being engageable with said rack teeth and arranged upon rotation thereof to cause said rod to move toward said pad against the action of said spring, a collar adjustably carried by said rod and cooperating with said member to limit movement of said rod by said gear toward said pad, means operative in response to movement of said member in pressure-applying direction to lock said rod to said member for movement therewith, and means for releasing said locking means in response to movement of said member in pressure-releasing direction.

16. In a machine for applying pressure to shoe parts, a pad for supporting a sole against which a shoe is to be pressed, a member for pressing a shoe against a sole supported on said pad, a rod slidably carried by said member for movement toward and away from said pad, a heel abutment carried by said member at the end adjacent to said pad, a spring connected to'said rod and arranged to move said rod relative to said member away from said pad, said rod being provided with rack teeth, a gear connected to said member, said gear being engageable with said rack teeth and arranged upon rotation thereof to cause said rod to move toward said pad against the action of said spring, a collar adjustably carried by said rod and cooperating with said member to limit movement of said rod by said gear toward said pad, said rod being provided with ratchet teeth, a pawl connected to said member and arranged upon movement of said pawl to one position to engage said ratchet teeth to lock said rod for movement with said member, a spring urging said pawl into said one position, means for holding said pawl out of said position, and means carried by said member for releasing said holding means to permit movement of said pawl to said one position in response to initial movement of said member in pressure-applying direction.

CHARLES J. GROSS.

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