Chain saw having a sprocket wheel cover and a brake device integ

Details Chain saw having a sprocket wheel cover and a brake device integ Chain saw having a sprocket wheel cover and a brake device integ

1992-06-19

1993-08-10

Yost, Frank T.

Cutlery

Cutting tools

Saw

30381, 30475, B23D 5702, B23D 5900, B27C 110

Patent

active

052337502

ABSTRACT:
The invention is directed to a motor-driven chain saw having a housing and a guide bar extending forward of the housing. The guide bar is clamped between the housing and a sprocket wheel cover. A brake device having a trigger configured as a hand guard is mounted in the sprocket wheel cover. The sprocket wheel is brought to standstill by the brake device when the trigger is actuated. With the sprocket wheel cover assembled, the hand guard is disposed transversely in front of the upper handle of the chain saw. In order to obtain a reliable triggering of the brake device, for example, during kickback and for a manual triggering at all areas of the hand guard, the hand guard is supported in a second bearing on the housing of the chain saw when mounting the sprocket wheel cover. In this way, torques acting in a direction opposite to the actuation of the hand guard are substantially avoided which could otherwise occur because of bearing play.

REFERENCES:
patent: 4197640 (1980-04-01), Murray
patent: 4370810 (1983-02-01), Schurr et al.
patent: 4594780 (1986-06-01), Schliemann et al.
patent: 4753012 (1988-06-01), Schurr
patent: 5094000 (1992-03-01), Becht et al.
"G410AVS.G455AVS G410AVSH.G455AVSH Owner's Manual", Komatsu Zenoah, Jul. 1990, p. 59 and FIG. 4.

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