Safety device for a portable chain saw

Details Safety device for a portable chain saw Safety device for a portable chain saw

1985-03-15

1986-12-02

Kazenske, E. R.

Cutlery

Cutting tools

Saw

188166, 188 77R, B23D 5702

Patent

active

046254064

ABSTRACT:
A safety device for a chain saw conventional in its overall construction is disclosed which comprises mainly a brake lever pivotally supported by the housing of the chain saw and arranged to stop the cutting chain when the brake lever is actuated either by inertia or by engagement with the operator's hand. The brake lever is formed with a cam surface adapted to press an engaging member connected to the drive shaft out of meshing engagement with an interlocking wheel for driving the cutting chain so as to shut off the driving power to be transmitted to the interlocking wheel. The brake lever also includes a braking member secured thereto and adapted for movement therewith in synchronism with the arcuate movement of the cam surface, into frictional braking engagement with the interlocking wheel for effecting a brake effect on the cutting chain.

REFERENCES:
patent: 2675835 (1954-04-01), Kiekhaefer
patent: 3237741 (1966-03-01), Potter et al.
patent: 3785465 (1974-01-01), Johansson
patent: 4140209 (1979-02-01), Muller
patent: 4328617 (1982-05-01), Satoh

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