Mining bit preload retainer

Details Mining bit preload retainer Mining bit preload retainer

1989-05-31

1990-08-28

Novosad, Stephen J.

Mining or in situ disintegration of hard material

Miscellaneous

299 79, F21C 3518

Patent

active

049520016

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.

REFERENCES:
patent: 4582364 (1986-04-01), deMay, III
patent: 4763956 (1988-08-01), Emmerich

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