Clutch mechanism for a chain saw

Details Clutch mechanism for a chain saw Clutch mechanism for a chain saw

1999-03-03

2000-08-22

Watts, Douglas D.

Cutlery

Cutting tools

Saw

30383, B27B 1702

Patent

active

061052639

ABSTRACT:
A chain saw is provided that comprises a motor which rotatingly drives a cutting chain via a sprocket mounted on a spindle (34) via a clutch mechanism. When the clutch mechanism (17) is engaged, a pivotal handle guard (22) interacts with the clutch mechanism to disengage the clutch mechanism (17). The clutch mechanism is biased towards disengagement. An actuating means (8, 68) is provided such as a switch which is releasably connected via a pin located within a groove to the clutch mechanism (17). The actuating means can override the biasing force to engage the clutch (17) when the actuating means (8, 68) is connected to the clutch (17). The pivotal handle guard (22) is configured so that it interacts with the pin wherein, when the pivotal handle guard (22) is activated, it detaches the actuating means (8, 68) from the clutch mechanism (17) by knocking the pin out of the groove.

REFERENCES:
patent: 1193008 (1916-08-01), Fuller
patent: 1988590 (1935-01-01), Geiger
patent: 2332743 (1943-10-01), Morris
patent: 3361165 (1968-01-01), Irgens
patent: 4352418 (1982-10-01), Teraoka
patent: 4625406 (1986-12-01), Fushiya
patent: 4782593 (1988-11-01), Kieser et al.
patent: 5709032 (1998-01-01), Mizutani et al.
patent: 5791057 (1998-08-01), Nakamura et al.

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