Metal deforming – By relatively movable offset tool-faces – With tool motion in fixed path
Patent
1988-12-16
1989-11-07
Jones, David
Metal deforming
By relatively movable offset tool-faces
With tool motion in fixed path
7245317, B21J 1534
Patent
active
048783722
ABSTRACT:
A push-pull tool for setting multi-piece fasteners includes a piston that is movable back and forth within a cylinder in response to fluid forces on opposite faces of the piston. One of the fluids is an air-oil foam mixture that acts essentially as an incompressible liquid force-transmitter, while being somewhat compressible so as to absorb shock loadings associated with rapid piston movements. A check valve is included in the system to admit atmospheric air into the air-oil foam mixture, to thereby partially compensate for oil leakage that might inadvertantly take place across the piston seals.
REFERENCES:
patent: 4005598 (1977-02-01), Ehmann et al.
patent: 4118969 (1978-10-01), Corbett
patent: 4347728 (1982-09-01), Smith
patent: 4580435 (1986-04-01), Port et al.
Kaelin John J.
Port Gary L.
Huck Manufacturing Company
Jones David
Shurupoff Lawrence J.
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