Emergency braking device for chain saw

Details Emergency braking device for chain saw Emergency braking device for chain saw

1982-04-05

1985-01-15

Stoner, Jr., Bruce H.

Brakes

Wheel

Transversely movable

30381, F16D 4904, B23D 5702

Patent

active

044934009

ABSTRACT:
An emergency braking device for a chain saw having a clutch drum drivingly connected to the engine crank shaft through a centrifugal clutch. The emergency braking device includes a braking band wound around the clutch drum and connected at its one end to a stationary part of the chain saw. The other end of the braking band is connected to an actuator having a lever member. The emergency braking device further includes a hit switch member adapted to be rotated when hit by an inertia action of an inertia member disposed in the vicinity of a front handle so as to surround the lever member. As a kick-back takes place in the chain saw, the inertia member hits the hit switch member which in turn drives the lever member to actuate the actuator thereby to tighten the braking belt to quickly brake the clutch drum.

REFERENCES:
patent: 3923126 (1975-12-01), Bidanset
patent: 3937306 (1976-02-01), Naslund et al.
patent: 3991469 (1976-11-01), Frederickson
patent: 4121339 (1978-10-01), Nikolich
patent: 4290512 (1981-09-01), Zindler
patent: 4324045 (1982-04-01), Hoppner et al.

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