Clutch mechanism for power driven hand tools

Details Clutch mechanism for power driven hand tools Clutch mechanism for power driven hand tools

1978-03-03

1981-05-05

Bonck, Rodney H.

192 clutches and power-stop control

Clutches

Torque responsive

74421A, 192 54, F16D 4320

Patent

active

042653479

ABSTRACT:
A clutch and safety overload for portable, power driven, hand tools is described. The clutch comprises a fixed half and a movable half which are urged into contact with each other more firmly as the load requirements increase. The load torque is fed back to the movable clutch half by a gear driven by the output spindle and which meshes with helical gearing carried by a jackshaft on which the movable clutch half is mounted. In one embodiment the overload safety is part of the clutch itself and involves a rotation of the movable clutch half in response to an overload condition, and against a spring force, which causes it to be displaced axially with respect to the jackshaft and out of engagement with the fixed clutch half. In a second embodiment, the overload safety comprises a mechanical linkage which disengages the clutch halves when the output stroke of the driven tool exceeds a predetermined amount.

REFERENCES:
patent: Re25842 (1965-08-01), Keane et al.
patent: 2268578 (1942-01-01), Eason
patent: 2473133 (1949-06-01), Bogart
patent: 2660281 (1953-11-01), Ochtman
patent: 2854113 (1958-09-01), Hallden
patent: 3095106 (1963-06-01), Morrison
patent: 3194367 (1965-07-01), Winter
patent: 3221852 (1965-12-01), Thomas
patent: 3240304 (1966-03-01), Wickersham
patent: 3269498 (1966-08-01), Hoenig et al.
patent: 3693254 (1972-09-01), Salonen
"Elektrische Handschere", Industrieanzeiger, Essen, No. 29, Apr. 9, 1954, p. 7.

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