Vertical-lift screw drive mechanism

Details Vertical-lift screw drive mechanism Vertical-lift screw drive mechanism

1988-09-06

1990-05-08

Watson, Robert C.

Work holders

Relatively movable jaws

Means for direct manual adjustment of jaw

B25B 102

Patent

active

049231855

ABSTRACT:
A vertical lift screw drive mechanism comprises a movable body, a stationary body, a screw, a screw nutseat, an eccentric cam, a ratchet sleeve, a guide key and a spring. The sleeve has a one-direction pawl matching a pawl groove on the cam end surface. The pawl drives the cam to rotate causing the screw to carry out a vertical up and down movement under an action of the cam, thus to engage with or disengage from the inner threads of the seat. On disengagement of the threads, push the movable body to slide fast along the guide track; on engagement of the threads, the screw may rotate to clamp a workpiece.

REFERENCES:
patent: 802040 (1905-10-01), Hanimann
patent: 2102602 (1937-12-01), Nash
patent: 2430458 (1947-11-01), Farrell
patent: 2672776 (1954-03-01), Elsenheimer
patent: 3669440 (1972-06-01), Kartasuk

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