Mining bit preload retainer
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United States of America Patent
Stats
-
Aug 28, 1990
Grant Date -
N/A
app pub date -
May 31, 1989
filing date -
May 31, 1989
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A preload retainer in combination with a mining or construction bit having a shank carried in the bore of a mounting block. The retainer is a split resilient collar which snaps over a reduced neck in a tool shank and is tapered on one side to cam into a reduced diameter around the neck of the shank to pass through the bore of the mounting block. Upon reaching the operative position, the retainer expands to provide a positive lock for the bit shank. In one embodiment the retainer can be extracted by a suitable tool. In a block bore with an internal groove, the retainer expands into the groove. A hollow plug closes the inner end of the bore and serves to cam the retainer into the reduced diameter to permit removal of the shank.
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