US1629920A

US1629920A - Apparatus for making rubber footwear

Info

Publication number: US1629920A
Application number: US669745A
Authority: US
Inventors: Frank J Macdonald
Original assignee: BF Goodrich Corp
Current assignee: Goodrich Corp
Priority date: 1923-10-20
Filing date: 1923-10-20
Publication date: 1927-05-24
Anticipated expiration: 1944-05-24

Description

1,629,920 May 1927' F, J. MQCDONALD APPARATUS FOR MAKING RUBBER FOOTWEAR Filed Oct. 20, 1923 2 Sheets-Sheet 1 1927. May F. J. M DONALD APPARATUS FOR MAKING RUBBER FOCTWEAR Filed Oct. 20, 1925 2 Sheets-Sheet 2 ill/III] I IMUJMPIIIIIZVIIJII "JH' 'HI ml W Wil member, supporting a hollow, festal v11 in which open, nally termediate part of paimie y 24, rear, hi i D g ATES , tau-en FlQE.

FRANK J. MAGDQNALD, DE AEBQN, OHIO, ASSIGNOB TO THE B. F. GOODRTCH COMZPANY,

GE NEW YORK, N. Y GOBI'GMTI'ON OF NEW 'YQRK.

arrene'rus roe. Maxine Bunsen roorwnan.

Application tiled Butcher M), W23. Serial No. 689,745.

This-invention relates to apparatus for the manufacture of footwear, especially rubber last, and a rubberized fibre or rag stock insole underlying said lining upon the last,

The operation of uniting the shoe lining and insole, so tar as I am aware, heretofore has been performed by mechanical wipers on a lasting machine, or by hand, with a heavy roller, in the case of manually lasted shoes. .Both of these methods have disadvantages, in that the folding of the lining around the sole edge results in numerous,

buckles and folds in the fabric which pressure alone may neither eradicate nor press flush with the insole.

My chief object is to produce rubber footwear haring improved adhesion between its lining and insole, and to unite the same so as to provide a smooth, flush junction of their exposed surfaces, and to provide improved apparatus and procedure for accomplishing this result. A more specific-object is to pro: vide apparatus of simple construction,

quickly adaptable to shoes of difierent sizes,

and rapid and economical in operation.

0f the accompanying drawings,

Fig.1 is a front elevation, partly in section, of a preferred form of my apparatus, and work therein. v

Fig. 2 is a side elevation of the same.

Fig. 3 is a perspective view of a shoe last with the lining. and insole thereon as they appear before being operated upon by my apparatus.

Fig.4 is a after such operation.

Referring to the drawings, 10 is a base vertical pedis mounted a depending pilot 12 secured at its upper end to a long, narrow,

upper end of the pedestal 11 is interbevcled as shown at 11 and the adjacent base.,,of the pilot is correspondingly tapered its-shown at 12, to provide a raceway for bearing balls 14 which permit the turret 13;- -i-:ieely to rotate, A collar 15, provided with outstanding stop lugs, one of which is shown at 15, is secured on an inthe pedestal 11, and a depending stop-arm 16 is secured to the turret the sole of transverse section of the same wluch, adapted to engage the toe of the horizontal table or turret E3. The

' i'ormer, engaging the 13 and adapted to abut said lugs to limit the rotation of said turret to approximately 180.

Mounted upon the turret 13 at opposite sides of its rotational axis are a pair of

cylindrical housings

17, 17 in each of which is a heating element 18, those shown being of the electric type, 19, 19 being electric condoctors therefor. I do not wish to limit myself to electrical heating elements, however, as other suitable heating devices may be employed. The bottom closure of each housing'l? includes an asbestos pad 20 upon which the heating element is mounted, and

the top cover of the housin comprises a rectangular plate 21, preterdbly oflhighly heat-conductive metal such as aluminum. Each plate 21 is provided with

upstanding dowel pins

22, 22,aligned transversely with relation to the table 13, and 23, 23 are heatconductive dies or forms mounted upon the respectiveplates 21 and provided with apertures .toreceive said dowel pins 22. Each die 23 is adapted to form a seat for a shoe assembly such as is shown at 24 in Fig. 3, in which 24 is a shoe last, 24* is an insole, and 24 is a lining stretched over said last and having a cemented edge 24 folded over the adjacent edge of said insole. The upper or seating suri'ace of the die 23 is shaped to conform to the contour of the bottom of the last,- so that the shoe assembly will fit snugly thereupon.

For forcibly-pressing each of the shoe assemblies 24 upon the respective dies 23, an L-shaped presser foot 25 is pivoted at its elbow, upon a horizontal cross-head 26, between a pair of

collars

27, 27 secured on the latter. The resser-toot is formed at its ends with arcuate work-engaging faces, one of work, is covered with a resilient pad 28 to avoid defacin the fabric lining 24, the other being a apted concurrently to engage the shank of the last, and said work-engaging faces are disposedat such relative distances from the pivot as substantially to equalize the pressure of the last upon the die throughout the sole area notwithstanding the fact that the one engaging the shank of the last exerts its force through a point nearer the center of said area than does the one engaging the toe of the work. The bare front part of the shank of thelast, with a short moment arm,

measured from the pivot of the pressurefoot, is adapted to apply a preponderance of the force exerted against the last, so that the other work-engaging face, engaging the stock u )on the last, is required to apply only a small, equalizing pressure, such as not to damage the stock, and is correspondingly disposed at the end of a relatively long moment arm. A tension spring 29 is secured at one endto the resser-foot 25 and at its other end to one of the collars 2?, normally to hold said presser-foot approximately in Work-engaging position. The

pivotal-mounting of the presser-foot and the arcuate form of its work-engaging surfaces adapt it to engage the shoe lasts of various sizes, so that it is necessary only to provide suitable die members in order to operate upon shoes of different sizes.

Each of the cross-heads 26 is secured to the upper ends of a pair of

vertical connecting rods

30, 30, which extend through suitable apertures in the table 13, at each side of the housing 17, and are secured at their lower ends to opposite sides of a vertically disposed, mobile, fluid pressure cylinder 31. A hollow, stationary piston rod 32 is secured at its upper end to the under side of the table 13 and extends downward into said cylinder 31, its lower end being provided with a piston 33. The hollow piston rod 32 is open at its lower end, beyond the piston, and is thus adapted to charge the cylinder, being connected near its upper end with branch pipe 34: from a supply pipe 34, and said branch pipe being provided with a three-way valve 35 for charging and exhausting said cylinder. The supply pipe 34: is secured at its lower end to the table 13 and its upper end is connected to a flexible conduit (not shown) communicating with a source of pressure fluid, preferably compressed air, said supply pipe 34 thus being rotatable with the table 13. Stop

pins

36, 36 are mounted in the connecting rods 30, projecting radially therefrom, and are adaptedto abut the upper surface of the table 13 to limit the downward movement of the cylinder to pre-' vent jamming of the presser foot against the die-when the machine is empty. For lifting each of the cylinders to disengage the work, upon the completion of the pressing operation and exhausting of the cylinder, a pair of

adjustable tension springs

37, 37 are attached to the table 13 at their upper ends, and at their lower ends to

eyebolts

38, 38 secured by wing-

nuts

38, 38, to the opposite ends of a bracket 39 attached to the bottom of the cylinder, the upward movement of the cylinder being limited by its closed lower end abutting the end of the piston rod 32.

In the operation 'of my apparatus, the dies 23 are heated, preferably to about 180 to 200 degrees F., by the heating elements 18,

and the work, in the condition shown in Fig.

3, is then mounted as shown in Figs. 1 and 2 ton rod secured to and projecting upon one of said dies, and the cylinder 31 is actuated to lower the pressure-foot 25 against the work and press the latter forcibly against said die. The operator then rotates the table 13 to bring the other die 23 within reach, and repeats the operation just described upon another piece of work, the time required for so doing being suflicient to insure proper heating and pressing of the first piece, which is then removed, the table being turned back to bring it within the operators reach. The operator thus proceeds in successive operations as described, keeping the pressing elements in substantially continuous operations Very effective and rapid pressing of the work is obtained, strong adhesion and a smooth surface of the lining and insole resulting, as shown in Fig. 4, the edge 2 1 of the lining being flush with the insole 2 and remaining permanently in that relation.

operation, softening the rubber, contributes largely to the result.

It will be observed that when-the parts are so proportioned that the pivot of the presser-foot is approximately over the center of the sole area of the shoe, as here shown, the equalizing of the pressure throughout the sole area of the last will be present notwithstanding variation in the size of successive lasts and variation in the points at which the presser-foot engages the last, since the effective moment arms of the presser-foot, as determined by vertical projection, vary in a compensating manner according to variation in the presser-foots points of contact with the work.

My invention is susceptible of modification within its scope, and i do not wholly limit my claims to the specific construction shown or the exact procedure described.

I claim:

1. Apparatus for making footwear, said apparatus comprising a support, a turret mounted thereon, a plurality of presser members mounted on said turret, each of said presser members being adapted to compact shoe parts assembled upon a last, a pisdownward from said turret under each of said presser members, a piston on the lower end ofeach of said piston rode, a cylinder mounted upon each of said pistons, pull rods secured to said cylinders and extending upward past said turret, means secured to the tops of said pull rods, over said dies, for pressing the work against said prcsser members. and means for charging said cylinders in diiferent rotary positions of said turret.

2. Apparatus for making footwear. said apparatus comprising a support, a turret ltld shoe parts assembled upon a last, a fluid pressure cylinder,'carried by said turret, for each of said presser members, means for actuating said cylinders in different rotary positions of said turret, and-means associated with said cylinders for pressing a last with shoe parts thereon against the respective presser members.

3. Apparatus for making footwear, said apparatus comprising a support, a turret mounted thereon, a plurality of presser-members mounted on said turret, each of said presser members being adapted to compact shoe parts assembled upon a last, a piston rod secured to and projecting downward from said turret under each of said presser members, a piston on the lower end of each of said piston rods, a cylinder mounted upon each of said pistons, pull rods secured to said cylinders and extending upward past said turret, means secured to the tops of said pull rods, over said presse'r members, for pressing the work against the latter, a fluid conducting member mounted upon said sup port coaxially with saidturret, and means leading from said fluid-conducting member and adapted to charge said cylinders through their respective piston rods.

In witness whereof I have hereunto set my hand this 17th day of'October, 1923.

FRANK J. MACDONALD.