Device for restoring lost fluid pressure particularly in rivetin

Details Device for restoring lost fluid pressure particularly in rivetin Device for restoring lost fluid pressure particularly in rivetin

1990-11-05

1991-12-17

Jones, David

Metal working

Means to assemble or disassemble

Overedge assembling means

29243523, 29243521, 7245317, B21J 1522

Patent

active

050725017

ABSTRACT:
In a conventional hydropneumatic gun, blind rivets are pulled and clinched by a single-acting spring-loaded hydraulic cylinder, with force applied by a power unit connected up to a supply of compressed air and incorporating a plunger proportioned and reciprocated in such a way as to actuate the hydraulic cylinder with non-compressible oil displaced under pressure from a master cylinder; the device, which permits of making up any loss in hydraulic pressure, comprises a reservoir connected with the master cylinder, a system by which a reserve supply of the same hydraulic oil held in the reservoir is kept suitably pressurized, and a ball check located between the reservoir and the master cylinder that opens to connect the cylinders to the reserve supply each time the plunger returns to its at-rest position, in readiness to clinch the next rivet.

REFERENCES:
patent: 3777540 (1973-12-01), Siebol et al.
patent: 4116036 (1978-09-01), Sheffield et al.
patent: 4130006 (1978-12-01), Ebbert et al.
patent: 4903522 (1990-02-01), Miller

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