Torque-limiting device

Details Torque-limiting device Torque-limiting device

2011-05-10

2011-05-10

Meislin, D. S (Department: 3727)

Tools

Wrench, screwdriver, or driver therefor

Responsive to torque on work

Reexamination Certificate

active

07938046

ABSTRACT:
A torque-limiting driver has a handle, a body, a torque-limiting assembly and a work-piece engaging tip. The torque-limiting assembly includes an upper and lower shank that have a plurality of teeth circumferentially spaced. The teeth have a vertical face, an inclined face and a flat peak. The inclined face is defined by a radius of curvature that transitions to the flat peak. There is a spring for applying pressure across the upper and lower shank. The teeth engage for relative rotation when the handle is turned and disengage when a predetermined value of torque is exceeded.

REFERENCES:
patent: 3003378 (1961-10-01), Hotchner
patent: 3354754 (1967-11-01), Amtsberg et al.
patent: 3695059 (1972-10-01), Laubach
patent: 4883130 (1989-11-01), Dixon
patent: 5501124 (1996-03-01), Ashby
patent: 6189666 (2001-02-01), Willmot
patent: 7197968 (2007-04-01), Bubel
patent: 7334509 (2008-02-01), Gao
patent: 7475619 (2009-01-01), Chiu et al.

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