US1283144A - Pneumatic shoe-press. - Google Patents

Description

J. H. GAMMETER.

PNEUMATIC SHOE PRESS.

APPLICATI'ON FILED SEPT. r. 1912 1 ,283,14;4 Patented Oct. 29, 1918 asnznssuzn INVENTOR.

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A T'TORNEY' UNITED STATES PATENT OFFICE.

JOHN R. GAMMETER, OF AKRON. OHIO. ASSIGNOR TO THE B. F. GUODRICH COMPANY. OF NEW YORK, N. Y.. A CORPORATION OF NEW YORK.

PNEUMATIC SHOE-PRESS.

Specification of Letters Patent.

Patented Oct. 29, 1918.

To all whom it may concern.-

Be it known that I, JOHN R. GAMMETER, a citizen of the United States, residing at Akron, in the county of Summit and State of Ohio, have invented certain new and useful Improvements in Pneumatic Shoe Presses, of which the following is a specification.

This invention relates to an apparatus for consolidating the elements of a rubber boot or shoe, prior to vulcanization, by means of compressed air or other suitable fluid under pressure. One of my objects is to provide improved means for supporting the lasted shoe in operative positionwithin the press chamber, and for packing the last or separating its vent outlet from the interior of said chamber. A further object is to enable the shoe press to be readily adjusted to accommodate shoes of different sizes.

Preferably, also. I equip the press chamber with a relief-valve controlled by the locking and unlocking movement of the cover. so that air pressure cannot be accumulated in said chamber until the cover is locked.

Of the accompanying drawings,

Figure l is a vertical section of a pneumatic shoe press constructed according to mv invention.

Fig. 2 is a section on the line of Fig. '1. omitting the shoe and last.

Fig. 3 is a detail plan view showing the control valve in section.

Fig. 4 is a vertical section at right angles to Fig. l, omitting some of the lower parts.

Fig. 5 is a plan view of the apparatus partly broken away to expose the interior, with a shoe therein.

Fig. 6 is a sectional view showing a vented last and a shoe thereon of a type adapted to be handled in the shoe press.

In the drawings, 10 is a pot or receptacle composed of a body casting 11, a cylinder 12 connected by bolts 13 to the lower end of said body. casting, the joint being packed by a soft ring 14, and a cover 15, said cover being swiveled at 16 on a bracket 17 hinged to the body casting at 18.' The edge of the cover is packed by a soft ring 19 seated in a groove in the body casting, and is interlocked with the body casting by locking means of the breech-block type, consisting of spaced projections 20, 21 on the cover and body casting respectively. 22 is a handle for turning the cover on its swivel joint to lock and unlock it.

Compressed air is admitted to and 14%. charged from the press chamber 33 in Ha receptacle 10, under control of a ping val\ r 2-1, to whose casing conneclcd a com pressed-air supply pipe and a pipe i ending to the chamber :53. there being :1 ballie plate 27 over the nmnlh of pipe 3 2 in said chamber to prevent the cm rent, of win pressed air from impinging at. full vclocitv upon tl1e lasted shoe. The ra ing of lln plug valve has a dischargiopening 25 llm ing to the atmosphere. The port -25: 2' 1 valve is shown in ils adiinlitnig position in Fig. 3 and in its discharge ln'imll l ll in Fig. l.

3 is an upwardly-closing cluick-valvc mounted on the cover 1 and controlling a passage 31 which leads from chamber :23 to the atmosphere, the stem 3; of said valve. when the cover is unlocked, coming under a plate 33 on the bracket 17 which is fixed at such a height that the valve 30 cannot close when under the plate. the object being to prevent the accumulation of pressure in chamber if the workman should carelessly turn on' the comprcssiul air or leave it on when the cover'1 is not fully locked. )Yhen said cover is turned to bring the pro ections 20 under the projections 21, valve stem 32 moves out from under the plate 33 and the valve will automatically close when the air is turned on. hen chamber 23 is vented to theatmosphere. the valve 30 tends to drop by gravity, or. if it should stick, it may be positively opened by the action of a cam surface 34, on plate 33, upon the end of the valve-stem as the cover is rotated to unlock it.

35 is a conoidal cup-shaped last-support substantially elliptical in end or plan view as seen in Fig. 2. to correspond with the shape of the top or legend of the last. said support having a liner or packing member 36 composed of vulcanized soft rubber to effect the sealing of the interior of chamber 23 by means of the end of the last. The flaring or conoidal shape of this support and its liner, not only forms a proper sealing joint by reason of its shape, but also allows lasts of different sizes to be accommodated. Fig. 1 showing in full lines a small shoe and last, and in brokendirrt s a large one. The

last-support is also adjustable up and down IUD for this purpose, and in order to keep a fluid-tight joint with the casing its periphery is formed as a piston 37 sliding in the cylinder 12 and provided with a packing ring 38. To effect the adjustment, the stem 39 of the last-support is formed with a lefthand thread screwing in the end wall of a nut 40 which has a right-hand screw-threaded connection 40 with the exterior of the cylinder wall, thus giving a quick motion when nut 40 is turned by means of a handwheel 41 formed thereon. An adjustable screw-stop 42 in the end wall of the nut limits the relative retracting movement of the parts and prevents the last-support 35 from being drawn entirely out of the cylinder 19. Broken lines in Fig. l. represent the position of said support for a large last. At diametrically opposite points on the last support 35 are two upwardlyprrr jecting guidepins 43 working through lugs H on the body casting ll to prevent the last support from turning.

4-3 is a spring plate fixed at its upper end it and forming a heel or back rest for the lasted shoe, and 47 is an adjustable screw stop to fix the position of said back rest for different sized shoes. The plate 45 is slightly concave as indicated in Fig. 1 to conform to the back of the shoe. It will be noted that the axis of the cylinder 12 and the last support 35 is somewhat inclined from the vertical in an upward and rearward direction, so that the back of the lasted shoe tends to rest by gravity upon the plate 45, while the top of the inverted last is supported and irictionally retained by the soft-rubber liner 36, an arrangement which allows the lasted shOe to be verv quickly inserted in and removed from its operative position in the press. 48 is a last which is referably made hollow, of cast metal sue as aluminum alloy, and formed in the end or top Wall thereof with air-discharge openings 49 connecting its in terior with the atn'iosphere through a passage 50 formed in the stem of the last-support 35. Vent-holes 51 are also formed in the wall of the last at suitable points, and particularly at the sole and ankle, to permit the escape of air from between the shoe and last into the interior of the latter and thence to the outer atmosphere as pressure is exerted u on the exterior of the shoe. 52, 52 are g azed openings in the cover 15 for viewing the interior of chamber 23 while under pressure. I

An apparatus of this type is particularly ada ted for operating upon arctics or other rub er shoes with high flexible tops whieh are readily sealed against the surface of the last by the air pressure, Fig. 6 showing such a shoe with rubber (cloth lined) upper 53 and sole54 and rubberized clotfi'top 55.

In operation, the cover 15 being unlocked and swung back on its hinge 18 and the last sup iort 35 and back rest 45 being adjusted to t. ie proper positions for the particular size of shoe, a last 48 with a shoe thereon is placed in chamber 23 in inverted position, with the top of the last resting in the conoidal cupshaped packing member 35, and the hack of the heel resting against the plate 45. Cover 15 is then closed and locked and the compressed air turned into chamber 23, its effect being to jam the last more tightly into the packing member 86 and also to press the shoe tightly against the surface of the last, the air between the shoe and the last being expelled through the vent holes 51 and the elements of the shoe being consolidated by the difference between the pressure of the atmosphere on the inside of the last and the external pressure in chamber 23. The operation is very quickly performed and sh when romplcted the chamber is opened, the lasted shoe removed and another one inserted. Vulcanizing is performed in the usual way and the result is a more perfect adhesion of the elements of the shoe and a greater durability in service by reason of the pneumatic pressure. employed.

1. In a rubber-shoe press, the combination of a chamber for inclosing it lasted shoe, a5 a last having opcnin s for the escape of air from between its sur ace and the lasted shoe thereon and a discharge opening in the top or leg-cud wall of the last, means for supplying pressure fluid to the interior of said Joe t'llfllilbtl' to press said shoe against: the last, and an annular last-support including a soft packing nu-inbcr surrounding an opening to the atmosphere and forming an end-abutting surface for said top or leg-end Wall of the last to seal said chamber.

2. In a rubber-shoe press, the combina- ,tion of a pressure chamber having coinpressed ai r supplying and discharging mean and a support at the bottom of said chamber for the top of an inverted vented last, said support including an annular conoidal last-packing member surrounding an airopening.

1 In a rubber-shoe press, the C(LdblnHtlOH of a press chamber having COIl'lt-IOSSGCl-Rll' supplying and discharging means, and a last-supportat the bottom of said chamber having a substantiall central opening to the atmosphere, and a conoidal soft-rubber liner 12o surrounding said opening and adapted to support and pack the end of an inverted vented last.

4. In a rub-beushoe press, the combination of a press chamber having compressed-air supplying and discharging means, and an annular last-supporting and packin member located at the bottom of said 0 amber and surrounding a vent-outlet opening, said memberbeing adjustable in an up-and=down eeann of a comprossednir chamber and e in the bottom of said chamber adjustable in an up-and-down direction and. hearing an annular last-packing and supporting member surrounding a vent-opening to the atmos where.

7. In a rubber-shoe press, the mmbinetion of a compressed-air chamber having 2 cylinder at its lower end, and a luetrsupport having a conoidal annular last-packing liner surroundin a, vent-opening to the atmosphere, saidlast-eupport being formeitl with it piston working in said cylinder.

8. In a rubber-shoe press,.rthe cmnlainntimi of a compressed-air chamber having :1 rearwiirdly and upwardly inclined qylmrh-r at the l-ottom thereof, a piston udji axially in said cylinder, and. a lHHlfilIPP-Mh curried hi said piston and having an unnulur lnst'puchmg member surrounding :1 rentopening to the atmosphere.

9. In ii rnhhi-r-shoe press, the oi ii c :mpr swi-air chamber liming 2L cylinder at its lower end, u out screwing on the exterior of said cylinder, a piston in said rylinder having a stem formed with an airent poeengre and provided with it si; v thread connection to mid nut of opposite pitch to that of {he nut and cylinihir thread, means to prevent iid piston from turning, and an aiu'nilnr in. i-supporting' and packing member on said piston surrounding the vent passage.

10. In rubber-shoe press, the combine-- tion of ii compressed-air chamber having e histwenting outlet in its bottom wall, an annular pecking member surrounding said outlet and adapted to support the inverted last in an upwardly and rearwardly inclined position, and a heel back-rest for the lasted 5 shoe.

11. In a rubber-shoe press, the combination of a compressed-air chamber having a last-renting opening in its bottom Wall, means for supporting the inverted last in a 5 reiirmirdly and upwardl inclined direclion in said chamber, sai means including e hietpucking andsunnortin member sur roundin said opening and a justable in en up-aml-down direction, and a. transversely 6 iu ustuhle heel back-rest.

12. In :I iubber-shoe press, the combina- Lion of a compressed air chamber, means for supporting and packins a vented last in an inverted upwardly and rearwardly inclined i din 'lion in said chamber, a spring pluto {on rag ii heel back-rest and fixed at its llppri end, and an externall -accessible screw for varying the angle 0 'said plate.

1? ln u rubber-shoe press, the comhinw lira-1 of ii compressed-air chamber having (-o' i provided with locking and unlocking. memo means for supplying compressed 'ziir to owl discharging it from said chmnbcr. meiur for supporting and packing a rented his-t in mid chamber, and means controlled l l looking and unlockin' of the cover for prvi'eniing the accumulation of air pro euro in aid rliamber when the cover liil' locked.

1-1, in ii rubber-shoe press, the Conilnnn tion of u compressed-air chamber having n cover rotatable in its own plane to lock mm unlo-ui; the some, said cover having :1 re lief opt-ping to the atmosphere, an out wards; rinsing automatic clicclc-i'alve con trolling; sax-l opening and having a vulv stem. z-sii abutment with which said vole, stem ulincd bv the unlockinn movement of rhit we: to prevent the valve from clos ing. and means for supporting and packing a wired last in said chamber.

In testimony whereof I have hereunto sit my hand this 6 day of September, 1917.

.JOHN R. GAMMETER.

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