Arrangement in a motor saw

Details Arrangement in a motor saw Arrangement in a motor saw

1985-06-17

1987-04-14

Argenbright, Tony M.

Internal-combustion engines

Engine speed regulator

Engine speed reduction by partial or complete omission of...

30382, 123419, 188137, F02P 900, B06T 712, B27B 1702

Patent

active

046569855

ABSTRACT:
Upon a kick-back of a motor saw, energy is transferred from the rotating parts of the engine into energy which generates the kick-back. This causes a tremendous decrease of the r.p.m. of the engine. In the saw there is an electronic control comprising a timer which measures the r.p.m. of the engine. During certain intervals the difference in r.p.m. is computed with respect to previous intervals and if the r.p.m. has decreased more than a predetermined value, a sensor in the electronic control emits a signal which releases an electrically controlled chain brake for stopping the chain.

REFERENCES:
patent: 4368707 (1983-01-01), Leshner et al.
patent: 4402138 (1983-09-01), Glockle et al.
patent: 4461257 (1984-07-01), Hosaka et al.
patent: 4553517 (1985-11-01), Andreasson
patent: 4573556 (1986-03-01), Andreasson

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