US544128A - Pneumatic press - Google Patents

Description

' UNITED STATES PATENT OFFICE.

GOTTLIEB SCHNASSE, JR., ANDYTHEODOR PAFFRATH, OF ELWOOD, INDIANA.

PN EUMATIC PRESS.

SPECIFICATION forming part of Letters Patent No. 544,128, dated August 6, 1895. Application tiled April 12, 1895. Serial No. 545,516. (No model.)

To all whom it may concern,.-

Be it known that we, Go'rTLIEE SoHNAssE, Jr., and THEoDoE PAEERATH, residents of Elwood, in the county of Madison and State of Indiana, have invented certain new and useful Improvements in Pneumatic Presses;

vand we do hereby declare that the following is a full, clear, and exact description of the invention, which will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings', which form a part of this specification, and in whichy Figure lis a side elevation of our improved atmospheric or pneumatic press complete and ready for use. Fig. 2 is a longitudinal sectional view of the same on a vertical plane through the middle of the air-cylinders, mold, and follower or platen. f

Like letters of reference designate corresponding parts in both figures.A

Our invention relates to pneumatic presses, or presses operated by compressed air, and

. it consists in the improved construction and combination of operative parts of an apparatus of thatI type, as will be hereinafter more fully described and claimed.

On the accompanying drawings, the reference-letter A denotes the bed or base of the machine, the central part'or body of which is recessed to form a hollow inold or intaglio die a, which may be of any desired proportions and shape, according to the purposes for which the press is to be used. On theexample shown on the drawings we have illustrated a press of our improved construction adapted for the manufacture of cofiins or burial-caskets from pressed glass. At opposite ends of this recessed bed A a are the posts or standards B B, supporting a crosspiece C, to the under side of which the aircylinders D, D', and D2 are bolted firmly. These cylinders or air-pumps are each provided with a plunger or piston E, the rod F of which works through an air-tight stuffingbox e in the lower end or head of the cylin` der, the lower ends of the three piston-rods being rigidly connected to one another by a horizontal bar or plate G, the projecting opposite ends of which have apertures g for the insertion of a perpendicular guide-rod H, (one or more at each end',) upon the upper end of which is fastened a rubber block or buffer h, held in place by a nut h'. Encircling each of the same rods H below the corresponding apertured end of plate G is a strong helical spring I, which operates,'when plate G is released, to instantly relieve it from the mold and forceV it, with its follower or platen, in an upward direction toward the buffers h.

The platen or cameo die a corresponds, of course, in size and conguration to the moldor intaglio die a, so as to form, when presseddown into the molten glass in the mold, the interior ofthe casket, and is fastened to the lower ends of the several piston-rods F FF below the follower-plate G. In order to reduce the weight of this platen and make it easier to release and lift from the mold, it may be recessed, as shown at b b, on its upper side, or it may be made hollow, which will answer the same purpose.

As all the air-pumps D, D', and D2 are constructed Yand operate alike, the description of one will suffice for all. By reference to Fig. 2 on the drawings it will be seen that each cylinder has on one side,'near its'lower end, an offset J, which forms an air-chest or valvechest, within which the slide-valves K and K' work up and down in unison operated by the valve-rod lo. The three valve-rods, one for each cylinder, are all fastened at their lower end in a cross-bar L, which connects the several piston rods F F F above the follower- 'fer n encircling the aperture in the air-chest through which the valve-rod works, so as to cushion the upstroke of the same. That part of each valve-rod 1c which works within the air-chest J is provided, as already stated, with two Valves K and K', adapted, respectively and alternately, to open and close the airports M and N. The former of these M leads from the chest or air-receiver J up into the IOC upper end of its appropriate cylinder, while the latterN leads from the lower end of the chest obliquely down into the lower end of the cylinder. In the position of the parts illustrated on the drawings, in which the platen a is shown in its lowermost position, or at the end of its downstroke, embedded into the material (not shown) with which the mold a may be illed, the inlet to port N is open for the ingress of air into the cylinder below the piston, for the purpose and with the result of forcing this in an upward direction and releasing the follower from the mold, while the upper port M is open for the exhaust of the compressed air above the piston used in driving this down. On one side of each valvechest J are two exhaust-ports M and N,vone for each port M and N, and also an intermediate port O for the inlet ot' live air through the air-pipes P, which connect the cylinders with the air-compressor, (not showng) and the valves K and K are so arranged relative to said ports that- When live air enters the cylinder through one it'will exhaust through the other, and vice versa. As seen in Fig. 2, the platen a is represented as having almost reached the end of the downstroke. A slight further Adownward movement will canse the valves K and K to be shifted, which will open communication between the upper part of the cylinder and the exhaust M' through the port M, and at the same time will open communication between the live-air pipe and lower part of the cylinder through the port N. This reciprocating adjustment of valves K and K is effected by means of the valve-rods 7c, which, as has already been pointed out, are fastened to and move with the cross-bar L and piston rods F, and to prevent jarring or concussion on the up and down strokes of the valve-rods these are provided, as has also been explained, with the butter-springs Z m and buffer-collars It. The return movement of the platen on the beginning of the upstroke of the pistons is facilitated and expedited by the end springs L L, which are shown compressed on one side of Fig. 2 and extended on the other side of said figure.

It will be seen that this press is entirely automatic, exceedingly simple in construction, and therefore strong and durable, and that it is very compact, so as to require comparatively little space for its manipulation and operation.

Having thus described our invention, we claim and desire to secure by Letters Patent of the United States- In a pneumatic press of the described type, the combination with the recessed bed containing the mold or intaglio-die and thereciprocatory platen or cameo-die, of the piston rods fastened in said die and connected by the apertnred plate G and parallel connecting bar L; gnide-rods l'l; springs l; pistons F; valve-rods k provided with butter-springs Z and m, and collars c; and air-cylinders pro- -vided with valve-chests, inlet-ports and exhaust, constructed and arranged to operate substantially in the manner and i'or the purpose shown and set forth.

In testimony that we claim the foregoing as our own We have hereunto afiixed our signatures in presence ot' two Witnesses.

GOTTLIEB SCIINASSE, Jn. 'll-IEODOR IAFFRATH.

Witnesses:

` C. KLUEN,

S. W. GlPsoN.

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