Patent ID: 9551217
Date: 2017-01-24
CPC Classifications: E21C

Claim:
1. A pick assembly comprising a bit assembly and a holder assembly; the bit assembly comprising a bit support body, a fastener mechanism, a deflectable member comprising a collar, and being cooperatively configured such that the deflectable member can be deflected in a radially outward direction responsive to a progressive coupling of the bit support body to the fastener mechanism; the holder assembly comprising a holder body and being configured for accommodating and retaining the bit assembly by an interference fit; the holder assembly and bit assembly being cooperatively configured such that the retention of the bit assembly by the holder assembly by the interference fit can be progressively increased responsive to the progressive coupling of the bit support body with the fastener mechanism when the bit assembly is accommodated by the holder assembly, operative to prevent substantial movement of the bit support body relative to the holder body in use; in which the collar is configured for accommodating at least part of the bit support body, the collar having a tapered inner surface configured cooperatively with a tapered side surface of the bit support body, the deflectable member being deflectable in the radially outward direction responsive to the tapered side surface of the bit support body being urged against the tapered inner surface of the collar responsive to the progressive coupling of the bit support body with the fastener mechanism, wherein a gap that extends in an axial direction is formed in a wall of the collar to facilitate in deflection of the deflectable member in the radially outward direction.