Chain saw electric all-stop safety switch

Details Chain saw electric all-stop safety switch Chain saw electric all-stop safety switch

1991-06-27

1992-04-07

Phan, Hien H.

Cutlery

Cutting tools

Saw

30383, 200 6185, 83DIG1, B27B 1702, B27G 1900

Patent

active

051015676

ABSTRACT:
A chain saw safety switch mounted in combination with a chain braking mechanism such that, when chain braking is initiated, both the chain motion about a chain guide bar and motor operation are automatically stopped. The safety switch according to one embodiment of the invention is mounted to the safety guard of the chain braking mechanism in a position such that it may be rendered operable by either a selective action of the saw operator or by the operator's reaction response to a hazardous operating condition. In either case, the safety switch effects short-circuiting of the motor ignition to stop all motor operation while at the same instant, the safety guard effects stoppage of the cutting chain motion about the chain guide bar. Alternatively, the safety switch is mounted in conjunction with the movable safety guard such that short-circuiting of the motor ignition is effected through the chain braking mechanism.

REFERENCES:
patent: 3131277 (1964-04-01), Brenzen
patent: 3664390 (1972-05-01), Mattsson et al.
patent: 3967085 (1976-06-01), Lockard et al.
patent: 4335514 (1982-06-01), Overy et al.
patent: 4426563 (1984-01-01), Grogan
patent: 4811487 (1989-03-01), Takahashi et al.

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