Screwdriver with torque setting mechanism

Details Screwdriver with torque setting mechanism Screwdriver with torque setting mechanism

2007-05-29

2007-05-29

Hail, III, Joseph J. (Department: 3723)

Tools

Wrench, screwdriver, or driver therefor

Responsive to torque on work

C081S474000, C081S475000, C081S478000, C081S480000

Reexamination Certificate

active

11204949

ABSTRACT:
A screwdriver comprises a torque setting mechanism including a torque adjustment ring, an actuation rod threadedly secured to the upper torque adjustment ring and a lower torque adjustment nut, a spring biased sleeve with the actuation rod passed, and a clutch ring snugly put on two opposing intermediate flats of the actuation rod and having an upper surface engaged the torque adjustment ring and a lower surface formed with recesses engaged with steel balls on an upper surface of a support ring in the sleeve. Turning a rotatable handle will turn the sleeve. The clutch ring will disengage with the steel balls if the torque exceeds a set value. Thus, the torque exerted on the handle will not transmit to a shank secured to the actuation rod so as to prevent a screw from being over-driven by the shank.

REFERENCES:
patent: 2732746 (1956-01-01), Livermont
patent: 2114793 (1972-09-01), None
patent: 3704764 (1987-09-01), None

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