Safety braking mechanism for a portable chain saw

Details Safety braking mechanism for a portable chain saw Safety braking mechanism for a portable chain saw

1974-10-15

1976-06-22

Jones, Jr., James L.

Cutlery

Cutting tools

Saw

192130, B25B 712

Patent

active

039643336

ABSTRACT:
A portable chain saw includes a flexible brake band for stopping the cutter chain. A sensing arm is engageable by an arm or hand of an operator to be swung forwardly to tighten the brake band. The sensing arm is continuously biased forwardly to a braking position by a power torsion spring. The same torsion spring also serves to normally hold the sensing arm in a rest position. A latch can be utilized to transmit latching forces from the torsion spring to the sensing arm. Alternatively, the torsion spring itself can serve as a latch to resist forward movement of the sensing arm. The torsion spring is yieldable to enable the sensing arm to be unlatched in response to being struck by the arm or hand of an operator and then swung forwardly by the torsion spring.

REFERENCES:
patent: 3739475 (1973-06-01), Moore
patent: 3776331 (1973-12-01), Gustafsson

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