US2263488A - Shoe supporting jack - Google Patents

Description

Nov. 18, 1941. 6. P 5. CROSS 2,263,488

SHOE SUPPORTING JACK Filed June 28, 1940 16 Sheets-Sheet 1 1 W835 M12101 1%. 5. 7; $2 6% 614 M Nov. 18, 1941. s. P. s. @2055 SHOE SUPPORTING JACK Filed June 28, 1940 16 Sheets-Sheet 2 Nov. 18, 1941. G. P. s. @2055 2,263,488

SHOE SUPPORTING JACK Filed June 28, 1940 16 Sheets-Sheet 3 Nov. 18, 1941. G. P. s. cRoss 2,263,488

SHOE SUPPORTING JACK Filed June 28, 1940 16 Sheets-Sheet 4 Nov. 18, 1941. G. P. s. CROSS 2,263,488

SHOE SUPPORTING JACK Filed June 28, 1940 16 Sheets-Sheet 5 g. 0' 2 rd 7 i 11% s I I 5 w m J6 r 17461 g h 1/ 1/5 E 1% Z35 E 2? Jr z nth w fiwfl No 18, 1941. G. P. s. CROSS 2,263,488

SHOE SUPPORTING JACK Filed June 28, 1940 16 Sheets-Sheet 6 I -7 I 6' Nov. 18, 1941.

SHOE SUPPORTING JACK Filed June 28, 1940 G. P. S. CROSS 16 Sheets-Sheet 7 mas 1Y6. AQL

Nov. 18, 1941.

lkzll G. P. S. CROSS SHOE SUPPORTING JACK Filed June 28, 1940 16 Sheets-Sheet 8 .5.M 7mm Nov. 18, 1941. s. P. s. CROSS SHOE SUPPORTING JACK l6 Sheets-Sheet 9 Filed June 28, 1940 Nov. 18, 1941. G. P. s. cRoss 2,263,488

SHOE SUPPORTING JACK Filed June 28, 1940 16 Sheets-Sheet 10 LLL Z56 linen/10F #cmm Nov. 18, 1941. G. P. s. CROSS 2,263,488

SHOE SUPPORTING JACK Filed June 28; 1940 16 Sheets-Sheet 11 Nov. 18, 1941. G. P. s. caos s 2,263,488

SHOE SUPPORTING JACK Filed June 28, 1940 16 Sheets-Sheet 12 19 r Q 9 I 15 O 11;? '15! 0 fim, wagw Nov. 18, 1941. G. P. s. (312055 SHOE SUPPORTING JACK 16 Sheet et 13 Filed June 2 Nov. 18, 1941. G. P. 5. Q2055 SHOE SUPPORTING JACK 16 Sheets-Sheet 14 Filed June 28, 1940 Nov. 18, 1941. G. P. s. CROSS I 2,263,488

SHOE SUPPORTING JACK Filed June 28, 1940 16 Sheets-Sheet l5 mas 1)? 5. $613 21 Nov. 18, 1941. G. P. s. CROSS 2,263,488

SHOE SUPPORTING JACK Filed June 28, 1940 16 Sheets-Sheet 16 gg J0 l/l/ Ill/Al Patented Nov. 18, 1941 SHOE SUPPORTING JACK Garrett P. S. Cross, Beverly, Mass., assignor to United Shoe Machinery Corporation, Borough of Flemington, N. J., a corporation of New Jersey Application June 28, 1940, Serial No. 342,967

31 Claims.

The present invention relates to shoe supporting jacks and is intended primarily as an improvement in the type of jack disclosed in applicants prior Patents Nos. 2,056,713 and 2,056,714, dated October 6, 1936.

This type of jack is designed to support a lasted shoe while being operated upon by the shoe making instrumentalities of various shoe making machines and more particularly automatic machines, in which means are provided for relatively moving the jack and operating instrumentalities to transfer the point of operation along the shoe and for controlling the relative positions of the shoe and operating instrumentalities during such transfer.

It is to be understood, however, that the several features of the present invention, except as hereinafter specifically defined in the claims, are not confined to any particular type of jack nor limited to use in any particular kind of shoe making machine.

The objects of the present invention are to facilitate the speedy and accurate location of a lasted shoe on the jack regardless of the size or style of the shoe and the clamping of the shoe firmly in adjusted position so as to prevent displacement on the jack during the shoe making operation while leaving all necessary portions of the shoe exposed to the action of the instrumentalities of the particular machine in which the jack is used.

With the above objects in view, a feature of the present invention has been embodied in a shoe supporting jack provided with toe centering grips or clamps similar to those disclosed in applicants prior patents but constructed and arranged to also act as a support for the toe portion of the shoe. To this end, the toe grips are shaped to extend around the last supported upper a suflicient distance to support the toe portion of the shoe at the desired height. In accordance with another novel feature of these toe grips, they are mounted in the jack so as to be capable of relative movement heightwise of a shoe placed on the jack to compensate for differences in the height of the last at opposite sides of the shoe.

Other novel features of the grips are their supporting means which permits them to be 1 position to which they are moved in placing a shoe on the jack.

Another feature of the present invention contemplates the provision in a shoe supporting jack of means for determining the plane transversely of the shoe in which the thread surface of the sole of a shoe supported on the jack will be located comprising leveling devices arranged to engage the under surface of the projecting shoe sole at opposite sides of the shoe. This feature has been embodied in a construction comprising leveling devices in the form of vertical pins which are yieldingly mounted in the toe supporting portion of the jack and are arranged to be depressed in unison as the shoe is forced downwardly by the operator to bring the toe of the shoe into engagement with the toe rest. The leveling pins are also mounted so as to be movable towards and from each other and this movement of the leveling pins, in the illustrated construction, is utilized to move the toe grips into engagement with the shoe.

In order to prevent possible interference with the operating devices of the machine in which the jack is used, a feature of construction relating to the leveling devices comprises means for withdrawing the leveling devices from contact with the shoe heightwise of the last after the shoe has been clamped in position on the jack. As has been stated, in the illustrated construction, the leveling devices are utilized to move the toe grips into engagement with the sides of the shoe. In order to permit the leveling pins to be readily withdrawn, the inward pressure of the pins towards the shoe is relieved after the toe grips have been locked in position and prior to the withdrawal of the pins. In this connection, it may be noted that the illustrated jack is provided with a toe gage to limit the lengthwise movement of the shoe in being applied to the jack and that this toe gage is likewise withdrawn heightwise of the last after the shoe is clamped in position. As a convenient means for withdrawing the toe gage, it is connected to be operated through the same mechanism which withdraws the leveling devices.

Other features of the present invention relate to an improved construction and arrangement for tipping the last pin upon which the heel portion of the lasted shoe is supported and at the same time bodily moving the support for the last pin to press the toe of the shoe firmly against the toe rest in clamping the shoe in position. The shoe supporting jack, in which the features of the present invention have been embodied, is provided with a jack frame carrying a toe rest and with a heel supporting arm mounted on the jack frame to move towards and from the toe rest. In applying a shoe to the jack, it is placed upon a last pin pivotally mounted on the heel supporting arm and the arm is moved towards the toe support to locate the shoe lengthwise on the jack. After being so located, it is clamped in position and in accordance with a feature of the present invention, the clamping means comprises means for tipping the last pin in a direction to force the toe of the shoe against the toe rest and for simultaneously moving the arm on which the last pin is mounted away from the toe rest, the combined movements acting to press the toe of the shoe firmly against the rest without producing any appreciable longitudinal movement of the shoe. By moving the arm on which the last pin is mounted away from the toe rest during the tipping movement of the last pin, the shoe as a whole is caused to swing about a center a substantial distance above the pivotal support for the last pin and thus the toe of the shoe is not advanced on the jack but is pressed directly downward.

The jack in which the several features of the present invention have been embodied, in addition to the features above referred to, also embodies many novel features of construction and. arrangement including novel mechanism for actuating the various parts and means whereby a free movement of the heel supporting arm towards the toe rest to locate the shoe longitudinally is permitted and thereafter relative movement of the heel support and toe rest is prevented and the mechanism by which the various parts of the shoe clamping mechanism are actuated is rendered operative. The advantages of these, and other novel features, as will hereinaiter appear, will be obvious to those skilled in the art from the following description taken in connection with the accompanying drawings, in which Fig. 1 is a view in side elevation of a shoe supporting jack embodying the several features of the invention, the jack illustrated being designed for use in an automatic sole trimming machine; Fig. 2 is a view in side elevation on an enlarged scale of the upper end of the toe supporting portion of the jack; Fig. 3 is a view in end elevation of the parts illustrated in Fig. 2; Fig. 4 is a view similar to Fig. 2, but with portions of the jack frame removed and broken away to show underlying parts; Fig. 5 is a view in end elevation, similar to Fig. 3, but with the end plate of the toe supporting portion of the jack removed, together with the parts supported thereby, and with certain parts shown in section; Fig. 6 is a view in end elevation of certain of the parts illustrated in Fig. 5, many of the parts in Fig. 5 being omitted to show more clearly the shoe supporting toe grips, together with their supporting and locking mechanism; Fig. '7 is a view in side elevation, partly in section, of the mechanism illustrated in Fig. 6; Fig. 8 is a detail sectional view taken on the line 8-8 of Fig. 6; Fig. 9 is a detail sectional view taken on the line 9-9 of Fig. 6; Fig. 10 is a view in end elevation of a portion of the mechanism illustrated in Fig. 5, illustrating particularly the leveling pins, together with their supporting and actuating means; Fig. 11 is a view in side elevation, partly in section, of the mechanism illustrated in Fig. 10; Fig. 12 is a view in sectional elevation of the mechanism illustrated in Fig. 5, the section being taken on a vertical plane passing substan- F tially through the leveling pins and the locking plunger for th toe grips; Fig. 13 is a view in end elevation of the lower end of the toe supporting portion of the jack; Fig. 14 is a view in side elevation of the parts illustrated in Fig. 13, with the frame of the machine broken away to show underlying parts, the mechanisms being illustrated in the positions assumed before a shoe is placed on the jack; Figs. 15, 16 and 1'7 are views similar to Fig. 14 illustrating the positions which the mechanisms assume at different stages in the operation of clamping a shoe on the jack; Fig. 18 is a detail perspective view of a portion of th mechanism illustrated in Fig. 14, certain of the parts being separated to more clearly illus trate the construction and arrangement; Fig. 19 is a sectional plan view taken substantially on the line I3-I9 of Fig. 12; Fig. 20 is a view in side elevation of the upper end of the heel supporting portion of the jack; Fig. 21 is an end view of the construction illustrated in Fig. 20 looking towards the right; Fig. 22 is a plan view of the parts illustrated in Figs. 20 and 21; and Fig. 23 is a vertical sectional view illustrating in sectional side elevation the parts shown in dotted lines in Fig. 20.

The jack illustrated in the drawings comprises a frame 2 which carries at its upper end the toe supporting devices or rest hereinafter described. At its lower end, the jack frame is mounted, as is customary in automatic machines of the type for which the jack was particularly designed. upon a supporting arm 4. The connection between the arm and the jack frame consists of a rotatable pulley 6 mounted on the arm, through which pulley the spindl at the lower end of the frame extends, and to which it is pivotally connected by a gimbal joint of suitable construction. Near the lower end of the jack frame is pivotally mounted a heel supporting arm 8 which is adapted to swing towards and from the toe supporting portion of the jack to locate a shoe placed on the jack in the desired longitudinal position. To support the heel portion of a shoe placed on the jack, the heel supporting arm is provided at its upper end with a pivotally mounted last pin 10 adapted to enter the usual last pin hole in the last. Suitable mechanism is mounted in the jack for tipping the last pin so as to press the toe of the shoe against the toe rest after the shoe has been located longitudinally on the jack and also connections are provided between the heel supporting arm and the toe supporting portion of the jack to hold the arm in the position to which it has been moved in locating the shoe. In order to enable the jack to receive long legged boots or shoes with high vamps, th heel supporting arm is formed with front and rear portions extending heightwise of the last of a shoe placed on the jack and separated sufficiently to provide an opening between them to receive the boot leg or high shoe upper.

When the parts of the jack are in open position ready to receive a shoe, the heel supporting arm is freely movable towards and from the toe rest, its movement in each direction being limited by slots 12 in the downwardly and forwardly extending flanges of a plate l4 pivotally mounted upon the rear portion of the heel supporting arm 8, the flanges of which plate extend on opposite sides of the frame 2 of th jack and the slots l2 of which are engaged by pins 16 projecting from the jack frame. This plate H, in addition to limiting the movements of the heel supporting arm, also forms a guide or guard to direct a boot leg or high upper into the opening between the front and rear portions of the heel supporting arm.

When a shoe is placed on the heel supporting arm and the arm is moved towards the toe rest, the movement of the arm is limited by contact of the toe of the shoe with a toe gage indicated at l8 and comprising a vertically arranged plate mounted on the front surface of the upper end of the jack frame 2.

The means for locking the heel supporting arm in the position to which it is moved to bring the toe of the shoe against the toe gage l8 comprises a slide (see Figs. 1 and 14) which is pivotally mounted at its rear end in the rear portion of the heel supporting arm and extends forwardly into the frame 2 of the jack. A rack indicated at 22 is formed on the lower side of the slide 20 and is arranged to cooperate with a segmental rack 24 formed on a rack carrying member 26 mounted in the jack frame. During the movement of the heel supporting arm towards the toe rest, the rack 22 is held out of engagement with the rack 24 by means of a compression spring 28 acting on a downward projection from the hub of the slide. So long as the rack 22 is held out of engagement with the rack 24, free movement of the heel supporting arm towards and from the toe rest is permitted. After the z:

secured in the arm 8, the arrangement being such that a pivotal movement of the block 28 about the pin 30 tips the last pin H1 in a direction to force the toe of the shoe against the toe rest of the jack. As was stated in the introductory part of the specification, the illustrated jack is provided with leveling devices arranged to engage the under surface of the projecting shoe sole at opposite sides of the shoe and thus determine the plane transversely of the shoe in which the tread surface of the sole will be located. To enable these leveling devices to 0perate satisfactorily regardless of the position of the last pin hole with relation to the bottom of the last, the last pin I6 is mounted on the block 28 so as to be capable of accommodating itself to the position to which the last pin hole is moved in bringing the tread surface of the shoe sole into the desired transverse plane. To this end the last pin projects from a base which is provided with a downwardly and forwardly extending pivot pin 32 having a bearing in the block 28. As illustrated in the drawings, see particularly Figs. 1 and 20, the axes of the last pin 10 and pivot pin 32 are located with relation to each other so as to intersect at substantially the heel seat of a last placed on the jack. To hold the last pin on the block 28, while permitting its ready removal, a latch 34 actuated by a spring 35 is provided pivotally mounted in the block 28 and arranged to engage a notch in the rear side of the pin 32.

After the shoe has been brought to the desired longitudinal position on the jack, the last pin is locked against movement with relation to the supporting block 28 by means of a locking 1 Ill) lever 36, mounted in the block 28 on the pivot pin 38, the upwardly extending arm of which lever is provided with a series of notches arranged to engage a corresponding series on the rear edge of the base of the last pin. After the shoe is in the desired longitudinal position, the last pin is also looked against backward tipping movement and to accomplish this result, the same lever 36 is utilized which locks the last pin to its supporting block. To enable the lever 36 to lock the block 28 against backward tipping movement, the lever is pivotally mounted in the block. To actuate the lever 36, its horizontally extending arm is connected by a link 38 (see Figs. 1 and 23) to the horizontal arm of a bell crank lever 48 mounted in the lower portion of the heel supporting arm 8. The vertical arm of the bell crank 40 is connected by a link 42 to an arm 44 pivotally mounted at its lower end on a pivot shaft forming the pivotal connection between the heel supporting arm 8 and the frame 2 of the jack. The arm 44 extends upwardly within the frame of the jack and at its upper end is provided with a rack 46 (see Figs. 1 and 14). It will be obvious from an inspection of these figures that a tipping movement imparted to the block 28 by the operator in forcing the shoe against the toe rest and also a movement of the heel supporting arm 8 towards the toe rest will impart a forward swinging movement to the arm 44, the lever 36 during these movements being held stationary with relation to the block 28 by contact of an adjusting screw 48 in the downwardly extending arm of the lever with a pin 50 in the block 28 and by the spring 35 which forms a yielding connection between the block 28 and the lever 36. It will also be obvious that a forward swinging movement imparted to the arm 44 while the heel supporting arm 8 is held against movement will first swing the block 28 and lever 36 as a unit on account of the connecting spring 35, thus forcing the forward end of the shoe downwardly upon the leveling devices and causing the last pin H) to rock about the pivot pin 32 to the desired position before engagement of the lever with the base of the last pin. Continued movement of the arm 44 acting on the lever 36 through the connections including the link 36 causes the spring 35 to yield and the lever 36 to engage the base of the last pin. After this, the block 28 and lever 36 again swing as a unit and tighten the shoe against the toe rest.

While the shoe is being moved to its desired longitudinal position, the arm 44 is free to swing. After the shoe is in position, the arm 44 is locked against backward movement by a rack 52 which is brought into mesh with the rack 46 after the meshing of the racks 22 and 24 which hold the heel supporting arm 8 against movement. The rack 52 is formed on the lower portion of the rack carrying member 26 and is brought into engagement with the rack 46 by a downward bodily movement of the rack carrying member. The rack carrying member 26 is mounted on a horizontal pivot shaft 54 in the machine frame so as to be capable of a bodily vertical movement as well as an oscillating movement and while the parts of the jack are in open position to receive a shoe, is held yieldingly in raised position and at the limit of its movement in a clockwise direction, as viewed in Fig. 14, by means of a tension spring 56 stretched between a pin 58 on the jack frame and a pin 68 on the rack carrying member 26 near the rear end of the rock 52. The spring 56 is arranged to act on the member 26 at one side of the shaft 54, as indicated in Fig. 14, and while the member 26 is not engaged by the racks 22 and 46, the spring tends to move the member 26 in a clockwise direction until the spring is stretched to some extent around a pin 62 on the jack frame. With the parts in the position indicated in Fig. 14, the member 26 is thus yieldingly held by the spring 56 in a position of equilibrium from which it can be readily moved in either direction. It is to be noted that the radial distance of the rack 24 from the center of the shaft 54 is several times less than the radial distance of the rack 52 from the center of the shaft. It is also to be noted that the racks 22 and 24 are brought into mesh prior to the meshing of the racks 46 and 52. The racks 22 and 46 are brought into mesh with the racks 24 and 52 of the member 26 after the shoe has been located in the desired longitudinal position on the jack. At this time, the teeth of the racks 22 and 24 may not be exactly in alignment and accordingly, when the racks 22 and 24 are brought into engagement, a movement of rotation in one direction or the other may be imparted to the member 26. At this time, the member 26 is free to move and accordingly, the racks may be brought into mesh without producing any movement of the slide 20 and through the slide a displacement of the shoe on the jack. After the racks 22 and 24 are in engagement, the teeth of the racks 46 and 52 may be out of alignment and accordingly as these two racks are brought into engagement, a movement in one direction or the other will be imparted to the member 26. This movement, however, will be not over the length of half a tooth of the racks 46 and 52 and by reason of the different radial distances of the racks 52 and 24 from the center of the shaft 54, will produce a much less and substantially inappreciable movement of the racks 24 and 22. Rack teeth of a size to afford the desired strength and rigidity can therefore be employed in the construction and arrangement of parts illustrated without interference with the desired nicety in the location of the shoe on the jack. Depression of the slide 20, as hereinafter described, to bring the racks 22 and 24 into mesh. imparts a bodily downward movement to the rack carrying member 26 and causes the rack 52 to mesh with the rack 46. Simultaneously with the meshing of these racks, the rack 52 near its forward end is brought into mesh with a pinion 64 mounted to rotate on a cross shaft 66 mounted in the jack frame to which shaft is secured a ratchet toothed segment 68 engaged by a spring-pressed locking pawl 10. In the final operation of clamping the shoe on the jack, a rotary movement is imparted to the pinion 64 from a manually actuated jacking lever I2, as will be hereinafter described. This rotary movement swings the arm 44 with its attached rack 46 in a direction to swing the lever 36 so as to lock the last pin to its supporting block 28 and thereafter tilt the block on the heel supporting arm so as to force the toe of the shoe firmly against the toe rest. Simultaneously with this clamping, tipping movement of the last pin, a bodily backward movement is imparted to the heel supporting arm 8 through the rack carrying member 26 and slide 26, which movement tends to still further tip the last pin and increase the pressure of the toe against the toe rest.

For the performance of certain operations on a shoe and with certain styles of last, it is desirable to locate the tread surface of the shoe or the bottom of the last in a transverse plane determined by the location of the last pin hole in the last. Accordingly, in the illustrated construction, means are provided for locking the last pin permanently to its supporting block 28, this means consisting of the adjustable set screw 48 which bears against the pin 50 and which may be adjusted so as to force the notched end of the lever firmly into engagement with the notches in the base of the last pin. To hold the pin securely in any desired adjusted position, a spring 14 is coiled around the set screw and is arranged to bear frictionally at one end against the lever 36 and at the other end against the head of the screw.

The toe centering grips or clamps which also act as a toe rest are similar in construction and each comprises a base portion 16, see Figs. 5, 6 and 7, shaped and arranged to extend beneath the toe portion of a shoe a sufiicient distance to form a toe rest and a portion 18 shaped and arranged to engage the side of the shoe. The base portions 16 are in the form of blocks and are pivotally mounted on the upper ends of supporting levers 86, the pivots for the block extending lengthwise of the shoe to permit the grips to swing so as to bring the toe supporting portion and the side engaging portion in contact with the shoe upper. To enable the side engaging portions 18 to conform to the longitudinal curvature of the lasted shoe, they are pivotally mounted in the base portions 16 to swing about axes inclined downwardly towards each other transversely of the shoe. There are two levers for supporting each toe grip, the block 16 of each grip being mounted between the upper ends of a pair of levers 80. At their lower ends, the levers 80 are pivotally connected to the arms of a transverse supporting yoke 82 which is pivotally mounted midway between its ends by means of trunnions 84 extending from the yoke into bearings in the vertical plates 86 and 88 forming a portion of the upper end of the jack frame 2. This arrangement of the parts for supporting the toe grips permits the grips to move outwards and from each other as the levers 80 swing about their pivotal connections with the yoke 82 and also permits the toe grips to move heightwise of the last with relation to each other to compensate for variations in the height of the toe portion of the last as the toe of the shoe is pressed downwardly against the toe grips. During this relative movement of the toe grips, the yoke 82 is rocked on its trunnions and equal movements are imparted to the toe grips in opposite directions.

The toe grips are moved into engagement with the sides of the shoe by the movement of the leveling pins towards each other, as hereinafter described, and in order to lock the toe grips in firm engagement with the shoe, after being so moved, a locking slide 90 is connected to each pair of levers 80. Each slide 90 projects from a plate 92 which extends between the levers 86 and is provided with outwardly projecting ears by which it is pivotally connected to the levers. At their inner ends, the slides 90 are received in a guideway extending transversely through the upper end of a frame 94, which is supported by the slides and is mounted so as to be capable of a swinging movement by means of a pin 96 extending transversely to and above the guide-

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