Motor-driven hand tool with braking torque device

Details Motor-driven hand tool with braking torque device Motor-driven hand tool with braking torque device

1989-01-23

1989-10-03

Watts, Douglas D.

Tool driving or impacting

Automatic control of power operated means

Tool advance causing or controlling means

192 17D, 188166, B25B 2314

Patent

active

048710334

ABSTRACT:
In a motor-driven hand tool, such as a drill, an inert mass is rotatably supported in a housing and is connected to the housing by a spring encircling a driven shaft mounted in the housing. The driven shaft is arranged to rotate a drill bit secured to the shaft. If the driven shaft is prevented from rotating and the housing rotates relative to the shaft, the spring tightens about and grips the driven shaft exerting a braking torque on it. The braking torque reduces the reaction torque required of the tool operator and affords a more rapid release of an overload clutch acting on the driven shaft. The overload clutch is formed by a collar, a gear wheel, a cup spring, and an adjustable ring nut, all located on the driven shaft.

REFERENCES:
patent: 2885042 (1959-05-01), Frechette
patent: 3476192 (1969-11-01), Noerr, Jr.
patent: 3921771 (1975-11-01), Szabo
patent: 4078618 (1978-03-01), DePagter et al.
patent: 4328871 (1982-05-01), Gluskin

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