US2063041A - Apparatus for applying pressure to shoe bottoms - Google Patents

Description

Dec. 8, 1936. L. G. KNOWLES APPARATUS FOR APPLYING PRESSURE TO SHOE BOTTOMS Filed June 30, 1933 3 Sheets-Sheet 1 Dec. 8, 1936. ow Es 2,063,041

APPARATUS FOR APPLYING PRESSURE' TO SHOE B OTTOM$ Filed June 30, 1933 3 Sheets-Sheet 2 AWE/V705 mhm Dec; 8,1936. L. G. KNOWLES APPARATUS FOR APPLYING PRESSURE TO SHOE BOTTOMS Filed June so, 1933 3 Sheets-Sheetv 5 Patented Dec. 8, 1936 UNITED STATES PATENT OFFICE APPARATUS FOR APPLYING PRESSURE TO SHOE BOTTOMS Application June 30, 1933, Serial No. 678,457

13 Claims.

This invention relates to improvements in apparatus for use in applying pressure to shoe bottoms and is illustrated herein as embodied in a structure intended particularly for use in cement attaching soles to shoes.

Objects of the present invention are to provide an improved pad and an improved pad box structure' for use in applying pressure to shoe bottoms. While the illustrated pad and pad box were developed particularly for use in cement attaching soles to mens shoes with the aid of a cement sole attaching machine of the character disclosed in Letters Patent of the United States N 0. 2,047,185, granted July 14', 1936, on an application filed in the name of Milton H. Ballard et al., it should be understood that the invention is not limited in its utility to embodiment in a machine of that type, nor is it limited to use in the manufacture of mens shoes.

Features of the invention include a shoe-receiving pad having a fluid filled chamber formed and arranged to underlie the marginal portion of a shoe bottom whereby pressure may be concentrated on that portion of the shoe bottom; a fluid (preferably liquid) filled pad having means for changing its normal volume, illustrated herein as a cam-supported plunger arranged by adjustment of the cam for movement relatively to the wall of the pad opposite its shoe-engaging wall, whereby the normal conformation of the shoe-engaging surface of the pad may be varied without introducing additional fluid into or extracting it from the pad; a novel construction by which the shank and forepart receiving portions of the pads may be adjusted and maintained in adjusted position relatively to each other; and a novel mask plate constructed and arranged to prevent excessive bulging of the pad when sole attaching pressure is applied, said construction, as illustrated, including pivoted mask plate sections having a pcriphery shaped approximately to conform to the end portion of a shoe, and means for causing the sections of the mask plate to move toward and from each other as they are moved lengthwise of the pad so that the exposed portion of the pad is narrowed as it is shortened and widened as it is lengthened, in accordance with the size of the shoe to be operated on.

With the above and other objects and, features in view, the invention will now be described with reference to the accompanying drawings and pointed out in the claims.

In the drawings,

Fig. 1 is a front elevation of a pad box embodying my invention, including also gage mechanism for positioning the shoe and sole relatively to each other on the pad and parts of the pressure applying mechanism of a cement sole-attaching machine;

Fig. 2 is a sectional view showing details of 5 means for maintaining the forepart of the pad box of Fig. 1 inadjusted position relatively to its shank portion;

Fig. 3 is a plan View of the pad box of Fig. 1 including gage mechanism with which it may be 0 provided;

Fig. 4 is a detail view of a toe support which may be used in connection with this pad box;

Fig. 5 is a detail view of sole and shoe gaging means for positioning the toe portion of the shoe and sole;

Fig. 6 is a plan view of the pad, portions of the pad box being indicated in broken lines;

Fig. '7- is a longitudinal sectional View through the pad of Fig. 6 and adjacent parts of the box structure; and

Fig. 8 is a sectional view of the heel seat and shank portions of the pad of Fig. 1 and adjacent parts of the pad box, the latter parts being adjusted to a diiferent operative position than that shown in Fig. '7.

The pad box and the pad of my invention are illustrated herewith as embodied in a cement sole attaching machine of the type disclosed in said LettersPatent of the United States No. 2,047,185. Accordingly, the main casting 12 of the pad box is shown (Fig. 1) as secured by screws 14 to a for- Wardly projecting portion of a shelf or bracket 16 which projects radially of the rotary turret of the machine. The right-hand end (as viewed in Fig. 1) of the casting I2 is provided with guideways in which an end wall carrying an outwardly extending bracket l 8 ismounted for vertical sliding movement, the bracket being maintained in its uppermost position when the pad box is idle by a pair of compression springs 19 the upper ends of which are seated in holes drilled in the bracket 18 and the lower ends of which are supported by a second bracket 20 secured by bolts 22 to the casting 12 of the pad box and having a rearwardly extending portion 24 which serves to support the fulcrum 26 of a bell crank lever 28 which forms part of the mechanism for operating the heel end gages.

The left-hand end of the pad box structure consists chiefly of a casting 30 approximately U-shaped in plan view and adjustably pivoted at 32 to the casting I2, lock screws 33 being provided to prevent inadvertent displacement of the pivots ,32.

The casting 30 carries the toe-end 1 gaging mechanism of the pad box and is held in adjusted position by mechanism illustrated particularly in Fig. 2. This includes a shaft 34 mounted in bearings toward the left-hand end of the casting 30 and provided exteriorly of the casting 30 with a hand wheel 36. Secured to the inner end of the shaft 34 is a short rock arm 38 the out-er end of which is bored to receive a pin 40 the rounded outer end of which is received in a cavity 42 formed in a latch bolt 44 which isshown in Fig. 2 as housed in the casting 30 and is pressed downwardly and to the left by a spring 46. The upper surface of the bolt 44 is beveled as shown at 48 and may be received in any one of a plurality of notches 50 formed in an arouate surface 52 of a block 54 secured to arms 56 projecting to the left from and rigid with the casting I2. The arcuate surface 52 is concentric with the pivot 32 so that the appropriate one of the several notches 50 may cooperate with the end of the latch bolt 44 in the diiferent adjusted positions of the casting 30, the position of the latter being selected so as properly to adjust the pad P housed in the castings I2, 30 of the pad box in accordance with the angular relation of the shank portion and the forepart of the sole of the shoe which is to be operated upon. Thus the hand wheel 36 may be gripped and rotated a few degrees in a counterclockwise direction, as viewed in Figs. 1 and 2, thereby releasing the bolt 44 from the notch 50 of the block 54 after which the casting 30 may be swung upwardly or downwardly about its pivot 32. Then, when the handle 36 is released, the bolt 44 will be urged outwardly by the spring 46 so that its end 48 engages one of the notches 50 in the block 44. If it should happen that the end of the bolt 44 engages the arcuate surface 52 between two of the notches 50 or above the uppermost notch a relatively slight downward pressure on the pad will cause suificient depression of the casting 30 to permit the end of the bolt 44 to move into the next lower notch 50. As the illustrated pad box is designed for operation particularly on mens shoes, the three notches 50 illustrated herein provide for sufficient adjustability of the forepart of the pad but it should be understood that the number of notches may be increased if greater adjustability is desired.

The top of the casting I2 is inclined upwardly toward the right and carries a pair of plates 60 (Figs. 1 and 3), one at each side of the pad P, secured to the casting I2 by screws 62 and having their inner edges overlying the pad as best shown in Fig. 3. The inner edges of the plate 50 conform in shape approximately to the outline of the shank portion of the sole of a shoe, the plates being spaced apart by a distance some or of an inch greater than the width of that portion of the sole of the widest shoe which is to be operated upon. Similarly, an approximately U- shaped plate 64 is secured by screws 66 to the top part of the casting 30, the plate 64, however, being spaced from the top of the casting 30 by a series of rolls 68 (Fig. 1) surrounding the respective screws 66 and resting upon a steel plate I0 corresponding in shape to the plate 64 and overlying the marginal portion of the pad P. Housed between the plates 64 and I0 is an adjustable mask plate 72 conforming in shape approximately to the outline of the forepart of a shoe and formed of two sections pivoted to each other at I4 so that they can be swung toward and from each other widthwise of the pad box in accordance with the width of the shoe which is to be operated upon thereby to prevent undue bulging of the pad P when the sole-attaching pressure is applied.

The mask plate I2, moreover, can be moved lengthwise of the pad to accommodate longer or shorter shoes by mechanism which will now be described.

Rotatably mounted in suitable hearings in the casting 30 is a horizontal shaft I6 the forward end of which is provided with a hand lever I8. The shaft I6 is provided near its ends with a pair of upwardly extending rock arms the outer ends of which are provided with rolls 82 located in slots 84 formed in lugs 86 depending from the sections of the mask plate I2, the proportions of the parts being such that the widthwise adjustment of the mask plate sections I2 will not cause the rolls 82 to leave the slots 84. Thus it will be seen that the mask plate 12 can be adjusted lengthwise of the pad and pad box structure by swinging the hand lever I8. In order to hold the mask plate I2 in adjusted position a notched segment B8 is secured to the rockshaft I6, a spring detent 90 being provided in position to engage with one or another of the notches of the segment 88.

In order that the screws 66 and the rolls 68 shall not interfere with the lengthwise adjustment of the mask plate I2 the sections of the latter are provided with slots 92 (shown in dotted lines in Fig. 3) which receive the rolls 68, and in order that the relative widthwise positions of the two sections of the mask plate I2 may be automatically adjusted as the plate is moved lengthwise of the pad, so that the plate sections will be brought nearer together when a small and therefore short shoe, is to be operated upon and will be moved further apart when a long, and therefore wide, shoe is to be operated upon, these slots 92 are inclined and somewhat curved whereby engagement of the rolls 68 with the walls of the slots 92 will move the mask plate sections widthwise of the pad about the pivot I4 as they are moved lengthwise.

The pad P, best shown in Figs. 6, 7 and 8, comprises two liquid filled chambers I00 and I02, intercommunicating as indicated at ml in Figs. '7 and 8, and arranged to receive the forepart and the shank portion respectively of the sole of a shoe. The chamber I02 is approximately rectangular in plan view and extends across the entire width of the pad P While the chamber I00 is approximately U-shaped, as best shown in Fig. 6, leaving a central space I03 which has no bottom wall and which therefore does not contain liquid. The space I03, however, is provided with a top wall I04 which is a continuation of the top wall of the chambers I00 and I02. Preferably, and as illustrated herein, the walls of the chambers I00, I02 are of a rubber composition, the top walls of the chambers as well as the wall I04 being reinforced by one or more layers I06 of canvas or other suitable fabric. As illustrated herein, the shoe S to which a sole is to be attached is somewhat longer than the pad P, the heel seat portion of the shoe being permitted to project beyond the right-hand end of the pad since the heel seat portion of the sole is not to be attached to the upper by cement but is to be secured by suitable pegs or nails as is done in the manufacture of the large majority of shoes. In attaching soles to shoes with pyroxylin cement, moreover, present-day practice utilizes a strip of cement perhaps of an inch wide extending peripherally of the sole forward of the heel breast 75 line, and this strip of cement on any shoe of a size suitable to be operated on by the illustrated pad box will overlie the chambers I and IE2.

In order to prevent any substantial deformation of the wall portions I08 of the chamber I02 and of I II] of the chamber I00, which walls bound the space I03, the space N13 is occupied by a series of metal plates H2 conforming in outline to the space I93 and held from each other by relatively weak springs II l. Pins H5 carried by and secured to the uppermost and lowermost plates IIZ are alined with and occupy holes in the other plates. Thus the stack of plates I I2 may be compressed, if necessary, when the top wall of the pad is forced downwardly by the sole attaching pressure without, however, applying any substantial pressure to the middle portion of the forepart of the sole while at the same time the edges of the plates H2 support the walls H38, II!) of the pad chambers, preventing them from bulging to any substantial extent into the space I03. A strip of flexible sheet material II'i may be utilized to cover the joint between the castings I2 and 30 beneath the forward end of the shank portion of the pad.

The illustrated machine is intended to operate on shoes of widely different sizes the areas of the soles of which vary accordingly. If such varying shoes were operated upon by a machine which applied uniform total pressure per shoe regardless of the size of the shoe it would result in sinking the small shoes further into the pad than the large shoe. This is undesirable, both as constituting unnecessarily rough treatment of the pad and by reason of the fact that excessive sinking of the shoe into the pad tends to cause the edge of the sole of the shoe to be rolled upwardly to an undue extent about the shoe upper. To avoid this by producing an effect similar to that which would be produced by adding liquid to the pad if a small shoe were to be operated on and by producing an effect similar to that which would be produced by removing liquid if a large shoe were to be operated on, I have provided a plunger I20 mounted for vertical movement through an opening in the bottom of the casting 52, as shown in Figs. '7 and 8. The plunger I2Il is formed with horizontal bearings to receive a shaft l24 near the ends of which are mounted a pair of polygonal cams I22 rigidly secured thereto and resting on projecting portions I23 of the casting I2. To permit the vertical adjustment of the shaft I24 and the plunger I28, the former passes through vertical slots I26 (Fig. 1) formed in the casting I2 and carries on its outer end a hand wheel I28 by means of which the shaft I24, the cams I22, and the plunger I28 can be adjusted. The plunger l2!) and the cams H22 are shown in Fig. 7 as adjusted to the position which they should occupy if a large shoe is to be operated upon, the plunger I28 being in its lowermost position. If, however, a small shoe is to be operated upon the plunger I 20 will be raised by rotation of the cam I22 thereby forcing the bottom wall of the pad chamber I02 upwardly thus putting the liquid in the chambers I and H12 under pressure and tending to bulge the top wall of the pad chamber 02 thereby resisting to a greater degree the tendency of the shoe to sink into and deform the top wall of the chamber I52 when the sole attaching pressure is applied.

The illustrated pad box is provided with forepart gage mechanism of the character disclosed in said application Serial No. 636,202. This mechanism includes a pair of sole-engaging fingers or gages 535, B2 arranged to engage the sole of a shoe on the pad substantially at or a little forward of the ball line of the shoe and a second pair of sole engaging fingers I33, I34 arranged to engage the opposite edges of the sole near the toe of the shoe. These gages, and the manner in which they are mounted on the pad box, differ from those of United States Patent No. 2,047,185 principally in that they are larger and of heavier construction. In the illustrated device, moreover, while the sole gases H3, I34 carry shoe positioning gages I35 (Fig. 5) as do the corresponding gages of the machine illustrated in said patent, the sole gages A35, 32 have not been illustrated as carrying shoe positioning gages.

The pad box is also provided with mechanism for positioning the rear end of a sole and shoe on the pad, such mechanism being indicated at I53, I52 in Figs. 1 and 3, and comprising a pair of soleengaging fingers and a pair of shoe engaging fingers. This positioning mechanism is not claimed herein, since it is not of my invention. It is, however, more fully disclosed in Letters Patent of the United States No. 2,005,755, granted June 25, 1935, on an application filed in the name of Francis J. Better.

It should be understood, of course, that the pad and pad box herein illustrated are intended to be used in a machine provided with suitable abutments for engaging the shoe and last, and that these abutments are forced downwardly to apply sole attaching pressure by mechanism which may be-of the character disclosed in said United States Patent No. 2,047,185. Thus the illustrated machine is provided with a last-engaging abutment 255 and a toe-engaging abutment, or toe rest as it is often called, indicated at 265 in Fig. 1, and provided with an undercut rib, illustrated at 262 (Fig. 4) as T-shaped in cross section, engaged in a correspondingly-shaped slot formed in a pressme-applying member 26%. If the size or style of the shoe to be operated on is such that a lower toe rest is desired, a block 256, of the nature of a thick shim, may be used, the block 255, as shown in Fig. l, having a T-shaped groove in the lower surface and a T-shaped rib in its upper surface and being interposed between the toe rest 255] and the pressure applying member 264.

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

l. A pad for use in applying pressure to work pieces comprising a fiuid-filled chamber formed and arranged to underlie the marginal portion of H a work piece and constructed to sustain a substantial pressure, said chamber having an inner wall at least partially surrounding a space underlying the central portion of the work piece and incapable of sustaining any substantial pressure, and means within said space to sustain the inner wall of said chamber against inward displacement when pressure is applied to a work piece on the pad.

2. A pad for use in applying pressure to shoe bottoms comprising a fluid-filled chamber formed and arranged to underlie the marginal portion of a shoe bottom and constructed to sustain a substantial pressure, said chamber having an inner wall at least partially surrounding a space underlying the central portion of the shoe bottom and incapable of sustaining any substantial pres sure, a plurality of plates within said space arranged in a pile and each of substantially the same shape and area as the plan of said space,

and means tending to separate the plates, whereby the edge surfaces of said plates sustain the inner wall of said chamber against substantial displacement when pressure is applied to a shoe on the pad.

3. A pad for use in applying pressure to shoe bottoms comprising a fluid-filled chamber formed and arranged to underlie the marginal portion of the forepart of a shoe bottom and constructed to sustain a substantial pressure, said chamber surrounding a space underlying the central portion of the forepart of the shoe bottom, a pile of plates within said space each of substantially the same shape and area as the plan of said space, and

' springs between said plates whereby the edge surfaces of said plates are normally spaced apart and are eifective at all times to sustain the inner wall of said chamber against substantial displacement under pressure applied to the pad.

4. A machine for use in applying pressure to shoe bottoms comprising a shoe-receiving pad having a fluid-filled chamber provided with a shoe-engaging wall and an opposite distortable wall, means for applying pressure to a shoe on the pad and for maintaining the shoe under pressure, a plunger adjustable independently of the means for applying and maintaining the pressure to force said opposite wall of the pad toward said shoe-receiving wall to a greater or less extent, and a cam serving as the sole means of support for said plunger and rotatable to adjust the plunger and to support it in various positions.

5. A pad for use in applying pressure to shoe bottoms comprising a fluid-filled chamber having a shoe-engaging wall and an opposite distortable wall, means for supporting said pad, a plunger carried by said supporting means and operable to force said opposite wall toward said shoe-receiving wall to a greater or less extent, and a polygonal cam member supporting said plunger and engaging a surface of said sup-porting means and rotatable to adjust the plunger and to support it at various elevations.

6. A pad box for use in applying pressure to shoe bottoms comprising a pad having a wall formed and arranged to engage the forepart and the shank portion of a shoe bottom, a supporting structure for the pad comprising a member underlying the shank portion of the pad, and a member underlying the forepart of the pad pivoted to said first-named member about an axis substantially underlying the forward end of the shank portion of a shoe in operative position on the pad, said first-named member hav ing a forwardly projecting portion underlying said second-named member, and a latch constructed and arranged to secure the projecting portion of said second-named member to said first-named member thereby securing said two members in adjusted position relatively to each other.

7. A pad box for use in applying pressure to shoe bottoms comprising a pad having a wall formed and arranged to engage the fo-repiart and the shank portion of a shoe bottom, a supporting structure for the pad comprising a relatively stationary member underlying the shank portion of the pad, and a member underlying the forepart of the pad pivoted to said relatively stationary member about an axis substantially underlying the forward end of the shank portion of a shoe in operative position on the pad, said relatively stationary member having a forwardly projecting portion underlying said pivoted member, and a latch carried by the pivoted member and engaging said forwardly extending projection to secure the pivoted member in adjusted position relatively to the stationary member.

8. A pad for use in applying pressure to shoe bottoms having a shoe-receiving wall and a mask plate overlying said wall, said mask plate comprising sections pivoted to each other and having a periphery shaped approximately to conform to the end portion of a shoe whereby excessive bulging of the shoe-engaging surface of the pad when pressure is applied is prevented, means for moving the mask plate lengthwise of the pad in accordance with the length of the shoe to be operated on, and means for causing the sections of the mask plate to swing toward and from each other about their pivot according as they are moved lengthwise of the pad to accommodate a smaller or a larger shoe.

9. A pad box for use in applying pressure to shoe bottoms comprising a fluid-filled chamber having a shoe-receiving wall of flexible material, a support for said chamber, and a mask plate carried by said support and overlying said flexible wall, said mask plate comprising sections pivoted to each other and having a periphery shaped approximately to conform to the end portion of a shoe whereby excessive bulging of the shoe-engaging surface of the pad when pressure is applied is prevented, means for moving the mask plate lengthwise of the pad in accordance with the length of the shoe to be operated on, and pin-and-slot connections between the mask plate sections and the support, the slots being inclined relatively to each other to cause the sections of the mask plate to move toward and from each other about their pivot according as they are moved lengthwise of the pad to accommodate a smaller or a larger shoe.

10. A pad for use in applying pressure to shoe bottoms having a shoe-engaging wall, a mask plate comprising a pair of members pivoted to each other and having a periphery shaped to conform to the outline of the end portion of a shoe, said mask plate overlying the shoe-engaging wall of the pad to prevent excessive bulging of the pad, a support for the mask plate and the pad, means for moving the mask plate lengthwise of the pad, and pin-and-slot connections between the mask plate sections and the support for the pad, the slots of said connections being inclined toward the rear of the pad so that lengthwise movement of the mask plate also moves the mask plate sections about their pivot toward and from each other, thereby narrowing the space between the sections when a short shoe is to be operated on and widening that space when a long shoe is to be operated on.

11. A pad for use in applying pressure to shoe bottoms having a shoe-engaging wall, a mask plate comprising a pair of members pivot-ed to each other and having a periphery shaped to conform to the outline of the end portion of a shoe, said mask plate overlying the shoe-engaging wall of the pad to prevent excessive bulging of the pad, a support for the mask plate and the pad, a lever fulcrumed to the support, connections between the lever and the mask plate whereby movement of the lever about its fulcrum moves the mask plate lengthwise of the pad, and pin-and-slot connections between the mask plate sections and the support for the pad, the

slots of said connections being inclined toward the rear of the pad so that lengthwise movement of the mask plate also moves the mask plate sections about their pivot toward and from each other, thereby narrowing the space between the sections when a short shoe is to be operated on and widening that space when a long shoe is to be operated on.

12. A pad for use in applying pressure to shoe bottoms having a shoe-engaging wall, a mask plate comprising a pair of members pivoted to each other and having a periphery shaped to conform to the outline of the end portion of a shoe, said mask plate overlying the shoe-engaging wall of the pad to prevent excessive bulging of the pad, a support for the mask plate and the pad, means for moving the mask plate lengthwise of the pad, and means comprising pins engaged in slots and connecting the mask plate sections and the pad support, said slots being inclined toward the rear of the pad so that lengthwise movement of the mask plate moves the mask plate sections about their pivot toward and from each other, thereby narrowing the space between the sections when a short shoe is to be operated on and widening that space when a long shoe is to be operated on.

13. A pad for use in applying pressure to shoe bottoms having a shoe-engaging wall, a mask plate comprising a pair of members pivoted to each other and having a periphery shaped to conform to the outline of the end portion of a shoe, said mask plate overlying the shoe-engaging wall of the pad to prevent excessive bulging of the pad, a support for the mask plate and the pad, a lever fulcrumed to the support, connections between the lever and the mask plate whereby movement of the lever about its fulcrum moves the mask plate lengthwise of the pad, and means for narrowing the space between the sections when a short shoe is to be operated on and widening that space when a long shoe is to be operated on comprising pin-and-slot connections between the mask plate sections and the support for the pad, the slots of said connections being inclined toward the rear of the pad so that lengthwise movement of the mask plate moves the mask plate sections about their pivot toward and from each other.

LLOYD G. KNOWLES.

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