Metal working – Method of mechanical manufacture – Assembling or joining
Patent
1980-11-18
1983-10-18
Watson, Robert C.
Metal working
Method of mechanical manufacture
Assembling or joining
292435, 29252, B25C 700
Patent
active
044097204
ABSTRACT:
A dual function device for pressing a workpiece in a single stroke of a press ram comprises a housing that carries first and second tools each having a working end that protrudes from one end of the housing. The housing can be removably attached, at an end opposite the one end, to the press ram. The first tool has a shank portion that includes a piston slidable in a piston chamber formed in the housing. Pressurized liquid may fill the piston chamber to hold the first tool in an extended protruding position with its working end protruding farther from the housing than the working end of the second tool. The device further includes a relief valve that selectively and controllably permits liquid to be exhausted from the piston chamber when the liquid pressure exceeds a predetermined limiting value. Therefore, as the press ram is operated through a single stroke, the first tool first contacts the work piece to perform one function. When the press ram pressure and, hence the pressure applied to the work piece causes the pressure of the liquid to exceed the predetermined limiting value of the relief valve, the valve operates to permit liquid to be exhausted from the piston chamber. The first tool then may retract into the chamber. Thereafter, during further operation of the press ram through its stroke, the working end of the second tool is moved beyond the working end of the first tool to press the workpiece and perform a second function.
REFERENCES:
patent: 3111868 (1963-11-01), Riggio
patent: 3465410 (1969-09-01), Ernest et al.
patent: 3602974 (1968-11-01), Koett
patent: 3750606 (1973-08-01), Schultz
patent: 3949631 (1976-04-01), Goldman et al.
patent: 4035901 (1977-07-01), Lux et al.
patent: 4175314 (1979-11-01), Spehrley
"Di-Dro Systems for the Metal Stamping Industry", Di-Dro Systems, Inc., Apr. 1974.
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