Piston and cylinder assembly

Details Piston and cylinder assembly Piston and cylinder assembly

1990-10-12

1991-11-19

Larson, Lowell A.

Metal deforming

By use of closed-die and coacting work-forcer

Cup or shell drawing

92 52, 267119, B21D 2414

Patent

active

050656074

ABSTRACT:
An improved press assembly has upper and lower draw rings which grip a workpiece. During closing of the press assembly, an improved control assembly accelerates the lower draw ring to a first speed and then to a second speed before the upper and lower draw rings move together. Similarly, during opening of the press assembly, the control assembly decelerates the lower draw ring to a first speed and then decelerates the lower draw ring to a second speed prior to stopping of the lower draw ring. The control assembly includes a two stage piston and cylinder assembly. The piston and cylinder assembly includes an inner piston and a hollow outer piston which encloses the inner piston. The inner piston is engagable with a flange on the outer piston to move the outer piston with the inner piston.

REFERENCES:
patent: 451846 (1991-05-01), Bachman
patent: 2420409 (1947-05-01), Bivans et al.
patent: 2434296 (1948-01-01), Swanson
patent: 2464962 (1949-03-01), Bent
patent: 3112705 (1963-12-01), Chlebowski
patent: 4723479 (1988-02-01), Gallentine

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