Back to results
US 7,743,513 B1Granted
Chainsaw tensioning device
AssigneeMTD Products Inc
InventorsDavid B. Fisher, Todd J. Ford
Life of this patent
Estimating the term…
Abstract
A chainsaw has a cam lever and cam assembly that can be used to adjust the tension of a guide bar in the chainsaw. Once the tension of the guide bar has been lessened, the guide bar can be moved back and forth by using a chain-tightening knob and tightening mechanism. The movement of the guide bar causes the chain to tighten or loosen on the guide bar.
Claims10
A chainsaw comprising:
- a housing;
- a power source positioned within said housing;
- a guide bar partially enclosed within the housing and extending from said housing;
- an endless chain wrapped around said guide bar and rotated by said power source;
- a cam lever positioned outside said housing and movable between a first position and a second position;
- a cam attached to said cam lever, wherein said cam rotates when said cam lever moves between said first position and said second position;
- a spring positioned between said cam and said guide bar such that when said cam rotates, said spring moves closer or farther away from said guide bar, thereby adjusting the tension of the guide bar;
- a rotatable chain-tightening knob on said housing and underneath said cam lever such that said chain-tightening knob is accessible when said cam lever is moved from said first position to said second position;
- a gear within said housing that meshes with said chain-tightening knob;
- and
- a tensioning screw interacting with said gear and said guide bar, wherein rotation of said chain-tightening knob causes said guide bar to move.
8 more elements
Dependencies are inferred from the claim text.