Hold down mechanism

Details Hold down mechanism Hold down mechanism

1980-11-12

1982-10-26

Gilden, Leon

Metal deforming

By use of closed-die and coacting work-forcer

Cup or shell drawing

72347, 72450, 269234, B21D 2200

Patent

active

043555276

ABSTRACT:
This disclosure relates to a hold down mechanism which is particularly adapted to apply a preselected hold down pressure on an element. It employs a bar which is pivotally mounted on a support member with the bar having a hold down surface thereon so positioned that when the bar is pivoted in a selected direction the hold down surface will engage the element in clamping relation and further pivoting of the bar in the same direction will result in the shifting of the pivot point for the bar from the pivot member to the hold down surface. The pivot member is spring loaded for lifting movement at this time with an associated spring pack providing for a controlled loading by the hold down surface against the element. A movable cam member having a wedge shaped lower end moves between a cam follower carried by the arm and a fixed cam follower to effect the controlled pivoting of the bar.

REFERENCES:
patent: 2140658 (1938-12-01), Van Sittert
patent: 2154983 (1939-04-01), LeJeune

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