Tension device for a chain in a chain saw

Details Tension device for a chain in a chain saw Tension device for a chain in a chain saw

1991-01-11

1991-12-10

Watts, Douglas D.

Cutlery

Cutting tools

Saw

30385, 83816, B23D 5702, B26D 148

Patent

active

050706187

ABSTRACT:
When moving the guide bar on a chain saw in order to adjust the chain tension, the following procedure is applied. Through the guide bar runs a shaft (19) having a slot for a screw driver as well as a shape of a cog-wheel (18) on the inside of the guide bar. The hole in the guide bar is the ordinary hole for a tension pin. The cover (11) above the clutch also keeps the guide bar in place and has an oval opening (23) providing accessibility to the above shaft in all its positions. Inside the guide bar, in the saw body, there is a suitable oblong cavity (16) to make room for the cog-wheel part of the shaft. That cavity has on its lower edge the form of a straight toothed section (17) adapted to the cog-wheel part.

REFERENCES:
patent: 4920650 (1990-05-01), Edlund
patent: 4939842 (1990-07-01), Rebhan
patent: 4999918 (1991-03-01), Schliemann et al.

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