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Chain saw automatic sharpening method and assembly
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Inventors: Potter, E. L.;
Assignee: Textron, Inc. (Providence, RI)
Primary Examiner: Parker; Roscoe V.
Assistant Examiner:
Attorney, Agent or Firm: Cushman, Darby & Cushman
A mechanical drive assembly that is particularly useful for moving a sharpening stone into engagement with a sharpenable chain saw is mounted to the side plate of the chain saw housing. The stone moves linearly a predetermined stroke length toward and away from the chain, and the beginning position thereof is incrementally adjustable, to take into account wear of the stone. The stone may be returned to an original position, for replacement, in another distinct mode of operation. |
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DETAILED DESCRIPTION The invention relates to the automatic sharpening of saw chains by the average user of the saw chain, while the chain is mounted on the saw sprocket and chain bar.
For many chain saw models, especially those directed to the non-professional market, it is desirable to provide for automatic sharpening of the chains by the user without removing the chain from the saw.
This is commonly provided by moving a sharpening stone or like element into contact with top-sharpenable cutter teeth of the chain while the chain is being driven by a normal operation of the saw.
While a number of prior systems have been provided which are capable of effecting automatic chain sharpening, there have been a number of drawbacks associated with prior art systems.
Commonly, the mounting arrangement for such structures in order to provide the proper operational movement of the stone into contact with the chain have been relatively complex.
Additionally, fine control of the movement of the stone into contact with the chain, with appropriate limiting of the extent of movement, has not been provided, resulting in undue wear to the stone and chain.
Additionally, any adjustments to be made in the initial position of the stone have conventionally been continuous adjustments, making it easier to move the stone too far, again resulting in undue wear to the components, and possibly even interfering with chain operation.
This is especially so since the market to which automatic saw chain sharpeners are primarily directed is, as mentioned above, the non-professional market.
According to the present invention, problems associated with conventional automatic saw chain sharpeners have been overcome, and a chain saw chain sharpener is provided that allows a controlled, repeatable, and accurate sharpening of a saw chain.
The sharpener mechanism is mounted in a readily accessible, convenient manner, the sharpening stone is moved into contact with the saw chain by a (predetermined length) stroke rotary lever, adjustment of the initial position of the stone to accommodate wear is incremental, and a mode of operation is provided for returning the stone mounting structure to an original position to allow replacement of the stone after the original stone has been worn down
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Exercise Devices 
