US825301A - Hydropneumatic press. - Google Patents

Description

PATENTED JULY 10, 1906.

E. D. CODDINGTON. HYDROPNBUMATIO PRESS. APPLIOATION FILED AUG 5 1903 2 SHEETS-SHEET 1.

PATENTED JULY 10, 1906.

E. D. GODDINGTON. HYDROPNEUMATIG PRESS. APPLICATION FILED AUG.5, 1903.

2 SHEETSSHEBT 2.

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I V Z) maQ UNITED STATES PATENT OFFICE.

Specification of Letters Patent.

Patented July 10, 1906.

Application filed August 5, 1903. Serial No. 168,250.

To aZZ whom it may concern.-

Be it known that I, EDWIN D. OODDINGTON, a citizen of the United States, residing at North Milwaukee, in the county of Milwaukee and State of Wisconsin, have invented certain new and useful Improvementsv in Hydropneumatic Presses, of which the following is a specification, reference being had to the accompanying drawings, forming a part thereof.

This. invention relates to machines in which a ram or plunger is o erated by an elastic fluid through the me ium 'of an inelastic fiuid and the pressure is augmented at the end or any part of the working stroke of said ram or plunger by an auxilia plunger or intensifier of comparatively smal area.

The main object of the invention is to simplify and im rove the construction and operation of mac ines of this class.

It consists in certain novel features of construction and in the peculiar arrangement and combinations of parts, as hereinafter particularly described, and pointed out in the claims.

For the purpose of illustration I have. shown a riveting press or machine embod ing the invention, which, however, is app icable with little or no change to other purposes.

In the accompanying drawings like characters designate the same parts in the several figures.

Figure 1 is a view, partly in side elevation and partly in vertical longitudinal section, of the machine. Fig. 2 is an axial section of the mechanism for operating the ram or pluner which carries the movable die; and Fig. 3 IS an enlar ed cross-section on the line 3 3, Figs. 1 an 2, showing the controlling-valve of the motor which operates the movable die or ram.

Referrin to Fig. 1 of the accompanyin drawings, t e frame of the machine is formed with two op osin jaws a a, one of which carries the fixe die the other being formed or rovidedwith a cylinder 0 op osite and in 'ne with the fixed die. In t 's cylinder a ram or plunger (1 is fitted to work, and to this ram the movable die e is ad'ustabl attached by a screw e. The cylin er an ram are preferably of the differential type, with one end. of each nearest the die of lar er diameter than, the other end. For withhrawing the ram and movable die away from the fixed die a compressed-air or other fluid supply connection f is made with the larger end of the cylinder 0. To force the ramdtoward'the fixed die and to reduce the working stroke of the movable ie, a cylinder g, having two independently-movable pistons h and 'i, is provided. This cylinder has at one end an extension consisting of two tubular parts 7' and 7c of larger and smaller bores or diameters, respectively. Referrin to Figs. 2 and 3 in connection with Fi l, 51o 1parts of this extension are arrangec l coaxial y with each other and with the cylinder 9 and normally communicate with each other at their a joining ends. The other end of the smaller part k communicates with the smaller end of the cylinder 0. The piston it has a tubular lunger l, which extends into and works eely in the larger part 7' of said extension, and the piston 't has a lun er m, which is fittedto work in the tubu arp unger land normall projects through it into said part 7' and is a apted to work in the smaller part k of said extension. The head of the c linder g opposite the extension 7' k is forme with an extension n, having abore in line with the axis of the cylinder, and the piston '11 has a tubular stem 0, which is fitted in said bore and may be formed as shown, inte ral with the plunger m. The passage p in t e stem 0 communicates at its inner end through lateral openings or branches gwith the space between the two pistons h an 'i. The extension at is also formed with a-valve-chamber r, communicating through a assagp s with the outer end of the bore in w 'ch t e tubular stem 0 works and through a passage t with the space between the adjacent cylinder-head and the piston i. A rotary va ve 0, formed with an axial exhaust-passage w, is fitted in said chamber. A pipe or passage :1: connects said chamber with a source of com ressed air or other fluid under pressure, an an exhaustpipe y, attached to the extension 1, as shown in Fig. 3, communicates with the exhaustpassa ew in said valve. At its end opposite the e aust-pipe the valve has a stem which projects through a stufiing-box and is provided with an arm 5. This arm is connected witha hand-lever 6 near the dies, as shown in Fig. 1,'or any other suitable connection for operating said valve may be employed. Be-

tween the cylinder g and its extension j k suitable packing z is provided around the tubular plunger Z. Packing 2 is also provided in the outer end of the tubular plunger around the plunger m. Between t e parts;

and 7c of the cylinder extension packing'3 is provided to prevent leakage back from part is into part 7' whenthe lunger m is advanced, and packing 4 is provi ed in the opposite cylinder-head around the tubularstem'o. The extension 7c is filled, by means of a pipe u, with oil or other inelastic fluid when the'plunger d is in its upper position, as shown in Fig. l, and the pistons h and i, with their plungers l and m, are in their initial positions, as shown in Fi 2, and said plungers are so proportione that when advanced into said cylinder extension 7' 7c their displacement of the oilor other liquid contained therein will'before the plunger m reaches the limit of its advance movement fill the smaller end of the cylinder normally occu ied by the ram (1, and thereby force sai ram to the full extent of its-movement toward the fixed die I).

The machine hereinbefore described operates as follows: The pistons handi, the intern sifier plungers Z and m, and the valve 4) normally occupy the positions in which they are shown in the drawings, and the ram '1) is forced back intoand held in the smaller end of'cylinder c by the constant admission of compressed air or other fluid underpressure intothe larger end of said cylinder 0 through the connection f. The work'being-placed between the jaws a of the frame with the rivet tofbeupset' in line with thedies, b and e, the

" valve '0 is first turned to the left, thereby establishing communication between-thezpas sage s and the supply-passage 1v. Compressed air or other fluid under pressure is thereby admitted through saidipassages and the passage p into the space betweenthepistons hand z. The piston '5 remaining stationary, the piston h isadvanced-or-movedto 'theleft'with the'tubular or larger inten'sifien lunger l, which displaces the oil' or other; iquid in the larger part 9' of the cylinder extension and forces said liquid therefrominto the c linder 0, thereby quickly moving the ram {with the die e, against the rivet-and partially u etting-the same. The valve 'v'is nowturne back to the right suflicientlyto connect the passage 8 with the exhaust-pas sage 'w and pipe y and the passage twith-the;

supply-passage w. The piston vl-isthereupom advanced or moved with the smaller intensit fierlunger m to the left, the air or other flui'cFfbetween the I two pistons escaping; through-the passages 10, s, and 'w. As the lunger m enters the bore of the small'erfpart I ,or the cylinder extension the-liquid-contained. therein is prevented-by the packing 3 i from escaping into the larger part 7' of said cylinder extension and as said p'l 7 er mlad- .vanees, displacing the liquidin-said part 7:. anil forcingit into the smallen end of-*said'cylinder c, the ramd, with the' die e, isadvanced with great force against the rivet supportedby the die 6, thereby completely upsetting and forming ahead on said rivet. T e valve om the cylinder 9 through the passages t and 'w, and also, if necessary, through the passages p, s, and w, communication between said passages and the supply-passage so being cut oil in this position of the valve. The compressed air or other fluid under pressure constantly admitted through the connection f to the larger end of the cylinder 0 thereupon forces the ram (1 back to its original position in the smaller end of said cylinder, displacing the liquid therein and forcing it back into the cylinder extension 7' k. The liquid thus forced'from the cylinder 0 by the ram (1 reacts first on the plunger m and then on the plunger Z to return the pistons i and h, with said plungers, to their original positions, as shown in the drawings. The machine is now ready for operation upon another rivet.

Various modifications in the minor details of constructionv and arrangement of parts may be made without materially affect the operation of the machine and within the principle and intended scope of my invention.

I cla1m 1 Ina hydropneumatic press the combination with a ram and a cylinder therefor, of a cylinder provided with two independentlymovable plstons, and with a tubular extension having larger and smaller bores, and plungers attached to said. pistons and fitted one within the other to work in the smaller and larger bores respectively of said cylinder extension, substantially as described.

2'. In ahydropneumatic press the combination with a ram and a cylinder therefor ofcoaxial chambersoflarger and smaller diameter communicating with each other and through the smaller chamber with said cylinder, a cylinder provided with two independently-movable pistons and with fluid su pl Y and exhaust connections and passages lhacfing. therefromto the space between the two: pistons and the-space between one of said pistons and the adjacent cylinder-head, a valvecontrolling said-passages, andplungers fitted' one the other to werkin said: dhanibers and attached to said pistons, sub-- stantially as described.

3. In a hydropneumatic press thecomhi nation with a ramand; a cylinder therefor, or a cylinderiprovid'edwith two independentlymovalilepistons and at .theends Wlthiillblllfil) extensions one of which has a larger and-a smaller bore communicating with the ramcylinder, a tubular plunger attached to-one piston-and fitted to work in the dargerbore, a smaller, lunger attached to'the cthergpi stenand 'fitte' {to work throughthetubularplnmger into the'smaller bore of one cylinden eletension, thelastmamed pistonihaving a tubu lar'stem-fitted'in-the other cylinder extension and communicating with the space between said pistons, and valve-controlled fluid supply and exhaust connections communicating with said tubular stem and with the space betweenone piston and the adjacent cylinder-head, substantially as described.

4. In a hydropneumatic press the combination with a differential ram and cylinder therefor having a fluid-sup ly connection at the 'lar er end, of a cylin er provided with two in ependently-movable pistons and with an extension having larger and smaller bores connected with the smallerend of the ramcylinder, plungers attached to said pistons and ada ted to work one within the other in the sma ler and larger bores respectively of said cylinder extension, and means for admitting and releasing an and from the space between said pistons and the'space between one of them and the adjacent cylinder-head, substantially as described.

5. ha hydropneumatic press the combination with a ram and a cylinder therefor, of

actuating fluid to a cylinder provided with two independentlymovable pistons and with an extension having lar er and smaller bores communicating throug the smaller bore with the ram-cylinder, a tubular plunger attached to one piston and fitted to work in the larger bore, and a longer plunger of smaller diameter attached to the other piston and fitted to work through the tubular plunger into the smaller bore of said cylinder extension, which is provided between its larger and smaller bores with packin fitting the smaller plunger and between its arger bore and the piston-cylinder with packing fittin the larger plunger, which is in turn provide with packing fitting the smaller plunger, substantially as described.

In witness whereof I hereto aflix my signature in presence of two witnesses.

EDWIN D. CODDINGTON. Witnesses:

MAUDE L. EMERY, CHAS. L. Goss.

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