Differential screw device for workholders and the like

Details Differential screw device for workholders and the like Differential screw device for workholders and the like

1979-04-09

1980-11-18

Watson, Robert C.

Work holders

Relatively movable jaws

Means to actuate jaw

B25B 110

Patent

active

042341779

ABSTRACT:
A differential screw device is disclosed including a first member having a threaded bore therein, a rod having a first threaded portion threadably engageable with the threaded bore in the first member and having a second threaded portion with threads of smaller pitch than the first threaded portion, a second member having a threaded bore therein threadingly engageable with the second threaded portion of the rod, a torsion spring fixed at one end to the rod and fixed at the opposite end thereof to the second member, and a means for rotating said second member relative to said first member thereby causing the first member to move relative to the second member until resistance is encountered which is equal to the torque of the torsion spring at which time the smaller pitch of the second threaded portion will rotate relative to the second member to reduce the rate of movement of the second member relative to the first member for a given rate of rotation of the second member.

REFERENCES:
patent: 1288612 (1918-12-01), Kaelin

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