US310546A

US310546A - tweddell

Info

Publication number: US310546A
Authority: US
Publication date: 1885-01-06
Anticipated expiration: 1902-01-06

Description

(No Model.) 9 v R. H. TWEDDELL, J. PLATT 82: J. FIELDING.

RIVETING MACHINE.

Patented Jan. 6, 1885.

; mam/1005a RALPH HART TW'EDDELL, OF W'ESTMINSTER, COUNTY OF MIDDLESEX, AND

JAMES PLATT AND JOHN FIELDING, OF GLOUCESTER, COUNTY GLOUCESTER, EN G LAND.

RlVETING MACHiNE.

EE'QCIFTCATION forming part of Letters Patent No. 310,51-6, dated January 6, 1885.

Application filed April 19, 1881. (No model Patented in England February fl, 1883, No. 5117; in France August 6, 1883,

No. 156,893, and in Belgium August H. 18:53, No. 62,233,

To all whom it may concern.-

Be it known-that we, RALPH HART Twen- DELL, of 'Westminster, in the county of Middlesex, and J AMES PLATT and Joan FIELD- ING,Of Gloucester, in the county of Gloucester and country of England, have invented certain new and useful Improvements in Direct- Acting Hydraulic Machines for tiveting; and we do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertaius to make and use the same;

Our invention relates to hydraulic or other fluid-pressure machines,and more particularly to means for varying the power of direct-act ing hydraulic machines for riveting and such like operations, so that their tools can be applied with more or less force according to the nature of the work to be done. For this purpose we provide the hydraulic cylinder of the machine with a differential plunger and with suitable valves, so that the thud-pressure can be made to act either on the smaller area of the plunger, or on its annular area,or on both areas, the force with which the plunger carrying the tool is advanced being thus capableof three variations.

-In the accompanying drawings, Figure 1 is a view in longitudinal section of our improved riveter. Fig. 2 is an end view of the same, and Figs. 3, at, and 5 represent modifications.

Gr represents a differential cylinder, removably secured to the base or frame H, and pro vided with ports communicating with both areas thereof. The plunger A is also made differential, so that the pressure can be made to act on both the annular area and the circular end area, D. The head E of the plunger, which carries the riveting-tool,is made eccentric, so that when the cylinder G is unscrewed from its place and the small or draw-back cylinder F removed, the plunger and head can be lowered sufficiently far to allow the head E to pass under the upper part, H,of the frame. By this construction we are enabled to make the plunger and head in one piece. The plungel A is suitably packed within the cylinder 'lat-or. (Not shown in the drawings.)

G, and is operated by water or other fluid admitted into the cylinder under-high pressure.

The valve 0, which is preferably a screwvalve, is adapted to close the port ai'rom communicating with the port I), which latter directs the water against the annular area B of the plunger. lowing the water to enter the port 0 it passes from thence into the cylinder and acts against the annular area of the plunger, forcing the latter out. If it is desired to increase the pressure, it is simply necessary to open the valve 0 and admit the water to the circular area 1) simultaneously with its admission to the. annular area B. The inner end of the plunger is consider-ab] y enlarged, and formed eccentrically to the main portion thereof, thereby forming a shoulder or abutment, (1, against which one end of the small push-back plunger A. bears. The cylinder F is removable, and is provided with asuitable pipeconnection to the pressure reservoir or accumu This cylinder opens toward the shoulder d of the pluir ger A, and is provided with a plunger, the outer end of which is adapted to bear against the plunger A. After the pressure on the plunger A has been relieved by opening the exhaust,the pressure in cylinder F forces the rain out and pushes plunger A back within its cylinder.

Fig. 3 shows a modified arrangement of ports for admitting the working-fluid into the cylinder. In this construction the water, instead of being admitted into the side of the cylinder, is admitted at the end between the ports a and b. Each of these ports is provided with a screw-valve for shutting off the supply from either area of the piston.

A cylinder and plunger representing variable area maybe constructed as shown in Fig. 4, the drawback being effected by a rod, 1'. In this instance the large cylinder G is provided centrally with the smaller cylinder, G, both cylinders being provided with suitable supply-ports. The plunger A consists, essentially, of a large plunger, G fitting in the larger cylinder and surrounding the smaller Thus it will be seen that by alcylinder, G, and the smaller plunger, G, Having fully described our invention, what working in the smaller eylinder,G, both plun- I we claim as new, and desire to secure by Let gcrs being rigidly connected at their outer ends.

WVhen it is desired to operate the riveter, water is admitted to either or both cylinders G G, and the pressure correspondingly increased as desired. It is of advantage to .lllitke a communication between one of the cylinders and a low-pressure cistern bya pipe, K, and interpose a cheek-valve, K, for the purpose of preventing the water in said cylinder from flowing back into the low-pressure cistern. In the drawings we have shown the pipe and check-valve applied to the larger cylinder. Now, by admitting water to the smaller cylinder the differential plunger is forced outwardly and a vacuum is formed in the larger cylinder. This causes the checkvalve K to rise and water from the low-pressure cistern to flow into the larger cylinder. If the smaller cylinder alone is insufficient in power to perform the work, pressure-water is then admitted into the larger cylinder,and as the latter has been filled with waste water no loss of high-pressure water is occasioned.

Fig. 5 is a sectional view showing another construction of differential cylinder, the cylinder in this case being the moving part, While the plunger is stationary. In this i11- stance the ram or head E is provided at its rear end with a circular cavity forming the main cylinder,in which the stationary plunger E rests. This plunger is provided with a port, Z), adapted to be closed by a screw-valve, and is also provided centrally with a cylinder in which the plunger a of the ram E moves. This cylinder is also provided with a port, a adapted to be closed by a screw-valve. Thus it will be seen that the water can be admitted to the annular area B, or to the circular area D, or to both, as desired. The draw-back mechanism is similar to that shown in Fig. 1.

\Ve are aware that a differential cylinder and plunger have been employed in hydraulic presses,and that adrawback plunger has been employed in riveting-machines, and hence we do not claim them, broadly; but,

ters Patent, is

1. In a riveting-machine, the combination, with a differential cylinder and plunger, of a push-back plunger arranged in direct contact with the forward portion of the differential plunger, and adapted to force it through its back-stroke, substantially as set forth.

2. In a riveting-machine, the combination, with a base, a large cylinder removably secured thereto, and a riveting-plunger the inner end of which is enlarged, of the removable cylinder F and the push-back plunger, one end of which bears against the enlarged end of the riveting-plunger.

The combination,with a base, a remova- 6 ble cylinder secured thereto, and the differential plunger provided with anenlarged inner end, and with a head for holding the rivetingtool, arranged eccentrically to the body thereof, of a removable cylinder, F, and a small plunger working in said cylinder and bearing at one end against a shoulder of the differential plunger.

4. In a riveting-machine, the combination, with a frame and a differential cylinder re movably secured to the frame, of a differential plungenthe removable cylinder F, and

the push-back plunger, all of the above parts adapted to operate as described. In testimony whereof I have signed this Specification in the presence of two snbscrib ing witnesses.

RALPH HART TWEDDELL.

Witnesses:

H. G. Soo'r'r, XVM. BAILEY.

In testimonywhereof we have signed this specification in the presence of two subscribing witnesses.

JAMES PLATT. JOHN FIELDING. \Vitnesses:

JOHN A. Porn, H. CADENNE.