Retract clamp apparatus

Details Retract clamp apparatus Retract clamp apparatus

1998-05-18

1999-11-09

Watson, Robert C.

Work holders

With fluid means

Plural positioning means sequentially operated

269 32, B23Q 308

Patent

active

059798866

ABSTRACT:
A retract clamp (20) utilizes three clamp arm retraction enhancement mechanisms (26, 28, 63) to increase clamp arm (24) retraction consistency. The first retraction enhancement mechanism (26) is a bifurcated piston having a first piston member (68) and a second piston member (70). If the first piston member (68) becomes tilted and caught, the second piston member (70) continues to move allowing the first piston member (68) to right itself. The second retraction enhancement mechanism (28) comprises a clamp arm guide mechanism having a base (82), a pusher (84), and a plurality of resilient members (110-124) interposed between the base (82) and the pusher (84) to bias the pusher (84) against the clamp arm (24) and align the clamp arm (24) with a clamp arm receiving area (40) defined in a clamp arm holder (22). The third clamp arm retraction enhancement mechanism comprises a lift surface (63) on the clamp arm (24). The lift surface 63 is oriented substantially perpendicular to the axis of the clamp arm (24) for upward retraction of the clamp arm outer end 54 substantially prior to axial retraction of the clamp arm (24).

REFERENCES:
patent: 3578306 (1971-05-01), Smith
patent: 3700227 (1972-10-01), Sessody
patent: 4365792 (1982-12-01), Johns
patent: 4504046 (1985-03-01), Yonezawa
patent: 4509298 (1985-04-01), Klievoneit

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