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US 4,315,370 AGranted
Combined saw chain tension adjuster and saw chain guard
AssigneeBlack & Decker Inc.
InventorDavid Horne
Life of this patent
Estimating the term…
Abstract
A chain saw is provided with a compact lever system which has the dual functions of tensioning the cutting chain and of protecting the operator from a broken chain.
Claims4
A chain saw having:
- a chain bar upon which is mounted a cutting chain;
- and
- a lever for tensioning the cutting chain;
- characterized in that:
- the tensioning lever is configured to obstruct the cutting chain in the event of a breakage thereof;
- thereby substantially shortening the length of the cutting chain thrown back toward the operator.
3 more elements
In a chain saw having a main body with a cutter bar projecting from the front thereof, an endless saw chain supported and guided by said cutter bar for continuous movement in a fixed loop shaped path along the length of the chain, and motive power means located in the main body having sprocket means to propel said chain along said fixed path, the improvement characterized by:
- lever means to adjust the tension of said saw chain, said lever means having a finger piece for manual or digital actuation;
- said finger piece being configured and located so that said finger piece:
- extends laterally of a first plane defined by said endless saw chain and extends thusly on both sides of said plane;
- lies approximately in a second plane which includes said front of said main body, which second plane is perpendicular to said first plane;
- and
- is situated closely adjacent to said saw chain on the exterior side of said fixed loop shaped path.
3 more elements
Dependencies are inferred from the claim text.