Chain saw with a stopping device

Details Chain saw with a stopping device Chain saw with a stopping device

1987-02-27

1988-11-08

Watts, Douglas D.

Cutlery

Cutting tools

Saw

188 77R, 192 12BA, B27B 1702

Patent

active

047825936

ABSTRACT:
A portable chain saw wherein the motor drives a hub which is coaxial with a cylindrical portion of the shaft for one sprocket wheel of the chain. A coil spring is wound around the hub and the cylindrical portion to normally transmit torque from the hub to the shaft and to brake the shaft in response to its disengagement from the hub as a result of pivoting of a guard for one hand of the operator. The guard is pivoted by the one hand when the chain saw wobbles or performs other undesirable movements. The coil spring, the hub and the cylindrical portion together constitute a so-called wrap spring clutch wherein the spring rotates with the hub until arrested by a pin-shaped decoupling element which is movable radially of the hub by a second spring in response to pivoting of the guard.

REFERENCES:
patent: 3361165 (1968-01-01), Irgens
patent: 4625406 (1986-12-01), Fushiya et al.

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