Variable-speed drill

Details Variable-speed drill Variable-speed drill

1974-12-11

1976-08-24

Gerin, Leonard H.

Machine element or mechanism

Gearing

Interchangeably locked

74333, 74337, F16H 308, F16H 552

Patent

active

039759660

ABSTRACT:
A housing accommodates a motor and a tool shaft which is to be driven by the same. A gear drive is interposed between the motor and the tool shaft and transmits power from the former to the latter. The gear drive has at least two gear sets providing different gear ratios, and an intermediate shaft. An axial safety coupling is associated with each of the gear sets and provided on the intermediate shaft to be rotatable with the same. Each safety coupling includes axially extending projections which are distributed about the axis of rotation of the intermediate shaft and which have circumferentially defined flanks. Each safety coupling has a diameter and a flank inclination at least one of which is accommodated to the torque generated by the gear ratio associated with the safety coupling. A biasing spring urges the projections of the safety couplings into engagement with one another.

REFERENCES:
patent: 2370885 (1945-03-01), Sohm
patent: 2772576 (1956-12-01), Ross
patent: 2861460 (1958-11-01), Lips et al.
patent: 3436980 (1969-04-01), Loge et al.

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