Chain guide for a chain saw
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Mar 30, 1982
Grant Date -
N/A
app pub date -
Mar 12, 1980
filing date -
Mar 30, 1979
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A chain saw guide blade includes a pair of side plates between which an axle is fixedly supported and a sprocket is rotatably supported with respect to the axle. The sprocket is rotatable about the axle with roller bearings therebetween for guiding a cutter chain for movement around the edge of the guide blade. A pair of annular seals are respectively disposed between the sprocket and one of the side plates and between the sprocket and the other side plate. Each of the seals includes an annular lip projecting obliquely into resilient contact with a surface of the sprocket or of one of the side plates. A grease-supply aperture in each side plate is normally closed off by a flap on the annular seal or resilient valve placed in a central hole of the axle. When under the pressure of forced grease through the aperture, the flap or valve is resiliently yieldable to allow the grease to be introduced for the lubrication of the roller bearings.
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