Tension device for a chain in a chain saw
AssigneeAktiebolaget Electrolux
InventorDag H. Edlund
Life of this patent
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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.
Claims5
A chain saw with a chain tension arrangement on said chain saw body comprising a guide bar attachment in which the said guide bar is movably fitted in its longitudinal direction by means of a tooth section (17) arranged in said chain saw body, a cog-wheel (18) for said section firmly united with a shaft (19) passing through a fitting hole (22) in the guide bar and through a long narrow hole (23) on the outside of the guide bar attachment, which hole is directed along the toothed section, said shaft provided with an outer end fitting to a screw tool.
Dependencies are inferred from the claim text.