Arrangement in a chain saw

Details Arrangement in a chain saw Arrangement in a chain saw

1989-02-16

1990-05-01

Watts, Douglas D.

Cutlery

Cutting tools

Saw

318116, B23D 5900, H02N 700

Patent

active

049206494

ABSTRACT:
When kick-backs occur on chain saws the cutter bar (36) is subjected to heavy forces, especially in the longitudinal direction. By putting in a piezo-electric crystal (37) at the cutter bar attachment in a place where the forces occur at kick-backs it can be effected that the crystal generates an electric impulse at sudden force changes, while the normally imposed screw powers do not give any signal. In this way it is possible to let the crystal trigger a mechanism (15) which releases the chain brake (14, 15) in an electrical way.

REFERENCES:
patent: 3447051 (1969-05-01), Attwood et al.
patent: 3889166 (1975-06-01), Scurlock
patent: 3968386 (1976-07-01), Heinzi
patent: 4152833 (1979-05-01), Phillips
patent: 4402138 (1983-09-01), Glockle et al.
patent: 4432139 (1984-02-01), Komler er al.
patent: 4656985 (1987-04-01), Andreasson et al.
patent: 4757881 (1988-07-01), Jonsson et al.

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