Motor-driven chain saw braking/locking apparatus

Details Motor-driven chain saw braking/locking apparatus Motor-driven chain saw braking/locking apparatus

1984-12-13

1989-03-14

Schrn, Donald R.

Cutlery

Cutting tools

Saw

188166, B23B 5702

Patent

active

048114871

ABSTRACT:
An electric motor driven chain saw braking/locking apparatus with which electric current flow to the motor of the saw is halted simultaneously with braking of the motor when a hand guard is tilted forwardly. A belt brake device and a brake switching device are linked with the hand guard, which is pivotably mounted to the housing in front of a front handle, such that the braking force is applied at substantial of the same time that the switch is opened. A brake drum of the brake device is fixed to a motor drive shaft of the motor at a position where it receives cooling air from the motor. A lock mechanism is provided in the hand guard whereby, in an emergency, a braking operation with the hand guard can be easily and quickly performed.

REFERENCES:
patent: 3991469 (1976-11-01), Frederickson
patent: 4026392 (1977-05-01), Hirschkoff
patent: 4246701 (1981-01-01), Johansson
patent: 4302879 (1981-12-01), Murray
patent: 4335514 (1982-06-01), Overy et al.
patent: 4474269 (1984-10-01), Kloberg et al.
patent: 4625406 (1986-12-01), Fushiya et al.

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