Metal deforming – By use of closed-die and coacting work-forcer – With stripping or ejecting from tool
Patent
1981-02-09
1983-02-01
Larson, Lowell A.
Metal deforming
By use of closed-die and coacting work-forcer
With stripping or ejecting from tool
72427, B21D 4504
Patent
active
043708781
ABSTRACT:
An improved workpiece ejecting system for presses includes an ejector piston hydraulically driven in response to reciprocation of the press slide in a manner whereby the motion of displacement of the ejector piston corresponds to the motion of displacement of the press slide during the stroke thereof, and the extent of displacement and velocity of the ejector piston are proportional to the corresponding characteristics of the slide. Ejector piston displacement is achieved by the flow of hydraulic fluid to and from the ejector piston chamber during reciprocation of the press slide through its total stroke. Ejector pins of various lengths are selectively associated with the press tooling and ejector piston to provide for varying the length of the workpiece ejecting stroke. Displacement of the ejector piston in the ejecting direction can be stopped prior to the slide reaching the end of its return stroke to provide a dwell in ejector pin displacement to facilitate workpiece feeding and removal with respect to the press tooling.
REFERENCES:
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patent: 2280849 (1942-04-01), Pocock
patent: 2379002 (1945-06-01), Haller
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patent: 2586536 (1952-02-01), Haller
patent: 3157111 (1964-11-01), Andersen
patent: 3411340 (1968-11-01), Asari
patent: 3456465 (1969-07-01), Pax et al.
patent: 3998087 (1976-12-01), Schumacher et al.
patent: 4068520 (1978-01-01), Carrieri
Gulf & Western Manufacturing Company
Larson Lowell A.
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