Patent ID: 9359895
Filing Date: 2016-06-07
CPC Classification: E21C

Claim Text:
1. A cutting bit retaining assembly for mounting a cutting bit at a cutting machine, the assembly comprising: a holder body having a through bore extending between a forward and a rearward end of the body; a bit shaft attachable to a cutting bit, the bit shaft extending axially through the bore, a rearward region of the bit shaft projecting from the rearward end and including an abutment portion, wherein the abutment portion is spaced from the rearward end of the body to form a groove therebetween; and a retainer positioned about the rearward region of the shaft to releasably retain the shaft in the body, the retainer having a first and a second abutment member spaced apart in the axial direction of the bore, wherein the first abutment member contacts the rearward end of the body and is axially movable within the groove and the second abutment member is axially locked around an external surface of the groove and contacts the abutment portion of the shaft, each of the first and second members having a head portion and a pair of legs extending from each respective head portion, the legs being spaced apart to accommodate at least a part of the shaft, the respective legs of the first and second members being coupled together such that the respective head portions are resistant to compression together to provide a retaining force under compression to retain the shaft in the body.