Brake device for braking the saw chain of a portable motor-drive

Details Brake device for braking the saw chain of a portable motor-drive Brake device for braking the saw chain of a portable motor-drive

1983-04-25

1985-12-24

Halvosa, George E. A.

Brakes

Wheel

Transversely movable

30381, 188110, 188139, 188166, 192 89A, F16D 4910

Patent

active

045600406

ABSTRACT:
A braking device for braking the saw chain of a portable motor-driven chain saw having a safety device which has a mass member, a locking lever being provided which is pivotably mounted on the hand guard lever and bears the mass member at its free, sprung end, co-operating by its other end with a control cam which bears against the brake lever and via which the braking operation of the rotating saw chain is controlled, in such a way that the braking operation of the rotating saw chain is automatically initiated, if an uncontrolled acceleration takes place, by the saw rolling down the timber trunk to be sawn at the moment when the saw becomes jammed, with the consequence that the resulting braking force counteracts the accelerating force, so that the recoil angle of the saw is reduced.

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International Publication #WO80/00548-Publication Date: 3.4.80-based on International Application PCT/US79/00721 of 13.9.79.

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