Chain saw device
First Claim
1. In a chain saw including a frame and having a driving motor,a saw chain cassette comprising a saw bar having a saw chain entrained therearound and a sprocket for engaging said chain and adapted to be driven by said motor,and a movable clamping cover adapted for interengagement with said frame while receiving said cassette between said cover and said frame in position for said sprocket to be driven by said motor, wherein said clamping cover removably secures said cassette against said frame by releasable compression to provide for rapid insertion and removal of said cassette,said cover and said frame having pads for engaging sides of said cassette, said cassette having longitudinal alignment ribs with which said pads are matingly cooperable for holding said cassette against rotation.
4 Assignments
0 Petitions
Accused Products
Abstract
A chain saw is provided with a saw chain cassette and a releasable clamping cover for holding the cassette against the side of the chain saw frame. The clamping cover, together with the cassette and the chain saw frame, have aligning surfaces extending in a direction longitudinal of the cassette saw bar for preventing relative rotation between the saw bar and the frame. A tightening mechanism for the cassette is used for urging the saw bar forwardly with respect to its drive sprocket and a further mechanism is provided within the cassette comprising a spring biased shoe for urging the cassette sprocket in a direction for tightening the chain when the cassette is removed from the chain saw frame. A camming device on the frame engages the shoe when the cassette is installed on the frame for holding the shoe away from the sprocket such that the latter can be driven by the chain saw motor drive shaft.
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Citations
22 Claims
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1. In a chain saw including a frame and having a driving motor,
a saw chain cassette comprising a saw bar having a saw chain entrained therearound and a sprocket for engaging said chain and adapted to be driven by said motor, and a movable clamping cover adapted for interengagement with said frame while receiving said cassette between said cover and said frame in position for said sprocket to be driven by said motor, wherein said clamping cover removably secures said cassette against said frame by releasable compression to provide for rapid insertion and removal of said cassette, said cover and said frame having pads for engaging sides of said cassette, said cassette having longitudinal alignment ribs with which said pads are matingly cooperable for holding said cassette against rotation.
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13. In a chain saw including a frame and having a driving motor,
a saw chain cassette comprising a saw bar having a saw chain entrained therearound and a sprocket for engaging said chain and adapted to be driven by said motor, and a movable clamping cover adapted for interengagement with said frame while receiving said cassette between said cover and said frame in position for said sprocket to be driven by said motor, wherein said clamping cover removably secures said cassette against said frame by releasable compression to provide for rapid insertion and removal of said cassette, wherein said cover is hingedly attached to said frame and is provided with an over-center locking mechanism for releasably holding said cover against said frame with said cassette in place.
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17. In a chain saw including a frame and having a driving motor,
a saw chain cassette removably mountable on said frame as a unit, said cassette comprising a saw bar having a saw chain entrained therearound and a sprocket for engaging said chain and adapted to be driven by said motor, said sprocket being relatively movable along said cassette, and biasing means located on said cassette for yieldably urging said sprocket in a rearward direction along said cassette for maintaining said chain in tensioned relation as entrained around said saw bar when said cassette is removed from said frame.
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22. A saw chain cassette for use with a chain saw having a driving motor, said cassette comprising a saw bar having a saw chain entrained therearound and a sprocket for engaging said chain and adapted to be driven by said motor, said sprocket being relatively movable along said cassette, and biasing means located on said cassette for yieldably urging said sprocket in a rearward direction along said cassette for maintaining said chain in tensioned relation as entrained around said saw bar when said cassette is removed from said frame.
Specification