US718365A - Riveting-machine. - Google Patents

Description

PATBNTBD JAN. 13,1903. G. E. MARTIN.

RIVETING MACHINE.

APPLICATION FILED DEG. 21, 1901.

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H0 MODEL.

PATENTBD JAN. 13, 1903. G. E. MARTIN.

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pm. mwwirzlw RIVETING MACHINE, I APPLICATION FILED DBO. 21, 1901.

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1' z nRnsPEfERscn HOTO- 'r 0 W5 GTO 0c NITED TATES ATENT FFICE.

GEORGE E. MARTIN, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR TO THE PEDRIOK do AYER COMPANY, OF PHILADELPHIA, PENNSYLVANIA.

.RIVETING-MACHINE.

SPECIFICATION forming part of Letters Patent No. 718,365, dated January 13, 1903. Application filed December 21,1901. Serial No. 86,734. (No model.)

To all whom it may concern:

Be it known that I, GEORGE E. MARTIN, a citizen of the United States, residing at Philadelphia, in the county of Philadelphia and State of Pennsylvania, have invented certain new and useful Improvements in Riveting- Machines, of which the following is a specification, reference being had therein to the accompanying drawings.

This invention relates to pneumatic riveting-machines in which the force that operates the riveting devices is transmitted from the power-cylinder through a liquid medium.

In order that. the invention may be readily understood, I will first describe the operation of the same and refer incidentally to the parts and detailed construction of the machine illustrated in the accompanying drawings, and subsequently will point out in the appended claims the novel characteristics of the invention.

In Figures 1 and 2 the machine is shown in side elevation, partly in section,with the principal elements composing the operative parts in relative position, respectively, at the commencement and termination of operation.

' Fig. 3 is an exterior, side view of the powercylinder detached from the frame by'broken lines and showing the operating-lever of the air admission and exhaust valve, and the passages and pipes communicating therewith shown partly in dotted lines. Fig. 4 is'a front elevation, partly in section, of the cylinder containing the dolly-bar and piston and a connected auxiliary cylinder containing a floating piston. Fig. 5 is a plan view of the base of the frame with the power-cylinder detached and showing the relative position of the cylinders 0 0 Fig. 4. Fig. 6 represents an enlarged view, partlyin section,of a relief-valve that controls a passage leading from the dashpot provided at the forward end'of the powercylinder. Fig. 7 is an enlarged end View, partly in section, of the bonnet or cover of the power-cylinder containing the air-admission valve and connected ports and passages; and Fig. 8 is an enlarged central longitudinal section of the power cylinder and piston and airadmission valve. Fig. 9 is an enlarged sectional elevation of the cylinder containing the dolly bar and piston with communicating ports and passages, the relative position of the parts indicating the preliminary contact of the riveting-tools with the rivet.

Referring to Fig. 1 of the drawings, the parts are shown relatively in starting position, air

under compression being admitted to the valve-chamber 1 through the inlet-pipe w, the valve 2 being ,set to allow the air to pass through the open port 3 into passages 4 and 5 and annular space a and act upon the piston P and force it to the inner end of the cylinder C. At the same time the air is also admitted through the pipe 6 into the annular space 8 in the cylinder 0 of the dolly-bar R, thereby forcing the dolly-bar piston -P to its extreme open throw. The air-admission valve 2 is now moved by the operating-handleHindirection to register the port 3 with the exhaustport 13 to permit theair-pressure to escape from the annular space aim the power-cylinder and from the annular space 8 in the dolly-bar cylinder 0 In this movement of the valve 2 the port 14 is first opened and the air under light pressure is admitted to passages 17, 18, 19, and 20, Figs. 3 and 7, and through pipe 21'and passages 22, and 23, Fig. 1, into the space 15 of the auxiliary cylinder C ,'Fig. 4. The piston 16 in the auxiliary cylinder C is moved forwardunder this light pressure, and the liquid in the cylinder 0 is forced through the port 24, Fig. 4, and passages 25, Fig. 9, and past the check-valve 26 into and filling the chambers 27 and 28, Figs. 8 and 9, and moving the dolly-bar piston P to the position shown in Fig. 9, which brings the dolly-rod R and riveting-die 'D in contact with the shank of the rivet 12, as shown. During this primary movement of the dolly-bar the airpressure is excluded from thepower-piston P. Upon a further movement of the air-admission valve 2 port 30, Fig. 1, is opened and pressure admitted through passage3l to the piston P in the power-cylinder, which upon starting intensifies the liquid-pressure in the chambers 27 and 28 by the displacement of the hollow fixed spindle P in the chamber '28 and closes the check-valve 26, Fig. 2. The

continued movement of the power-piston upon the hollow fixed spindle P forces the liquid in chamber 28 through the spindle, producing an intensified pressure in the chamber 27 by the increasing displacement of the spindle P in chamber 28, which acts upon the piston P and forces the dolly-bar R and riveting-die D to act upon and form the rivet-head under great and increasing pressure, as shown in Fig. 2. In the return movement of the piston P and to insure its complete movement by the relief of all the liquid contained in the chambers 27 and 28 the stem of the check-valve 26 is connected with a small piston 34, fitted within a recess made in the end plug 35 of the dolly-bar cylinder. (See Fig. 9.) Upon the return of the parts, as shown in Figs. 1 and 4, wherein the air-pressure is admitted to the annular space 8, it is also admitted through the passages 36, 37, and 3S, beneath the piston 34, Fig. 9, which forces the check-valve 26 to open and permit the superfluous liquid in the chamber 27 to return through the passages 25 and 24, Figs. 9 and 4, to the auxiliary cylinder 0 This auxiliary cylinder C is provided with a plug 39 for purpose of refilling the same.

In the head of the power-cylinder a chamber or recess 40 is provided to act in connection with the projecting part 41 of the powerpiston for checking the return movement of the piston near the termination of the stroke, a relief-valve 42 (shown in the enlarged and detached view, Fig. 6, and end view, Fig. 7) being provided to permit the power-piston to fully complete its return stroke and to admit a small amount of air in the chamber or recess during the beginning of the forward stroke of the power-piston P. This device is well known in this class of machines and is not claimed herein.

The power-piston is constructed with an annular ring P and hollow trunk T of less diameter than the power-cylinder, which provides for the surrounding annular space a, and the correspondingly-d1minished efiective piston area exposed to the operating pressure during its return movement, whereby an economy is obtained in the less quantity of air used. This hollow trunk portion T has an interior chamber 28 for holding the liquidtransmitting medium and is provided at its head 32 with an opening and stuffing-box 33, by which the trunk T moves upon the fixed hollow spindle P.

In Figs. 1 and 2 the machine is shown in an inverted position with respect to the Work to be performed for convenient use in particular places and in order to place the rivet through the plates from above and prevent it from dropping out before the riveting-die is brought in contact. The machine, however, may be suspended by either of the respective bails shown and employed in the reverse position when desired.

What I claim, and desire to secure by Letters Patent, is-

1.. In a riveting-machine, the combination of a power-cylinder provided with a diiferential power-piston constructed with a hollow trunk for containing a liquid, a fixed hollow spindle communicating therewith and with the riveting piston-cylinder; a minor pistoncylinder communicating independently with the air-pressure and with the riveting-cylinder, and a check-valve device with means for operating the same located between the riveting and the minor cylinder, for the purpose set forth.

2. In a riveting-machine substantially as described, the combination of a riveting piston-cylinder C and a minor cylinder and piston C with the check-valve 26, connected piston 34, and communicating passages 36, 37, 38, whereby said check-valve 26 is opened upon the admission of the operating air-pressure to the valve-piston 34 to permit the contained liquid in the chamber 27 to pass to the minor cylinder C through passages 24, 25, for the purpose set forth.

In testimony whereof I at'fix my signature in presence of two witnesses.

GEORGE E. MARTIN.

Witnesses:

J. HARRY 000K, GEORGE GEOFF.

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