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Drive point locking method and apparatus

  • US 5,542,481 A
  • Filed: 04/10/1995
  • Issued: 08/06/1996
  • Est. Priority Date: 04/10/1995
  • Status: Expired due to Term
First Claim
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1. An apparatus for releasably locking a drive point at the leading end of an elongated tube including a cutting shoe having an inwardly opening recess in the sidewall of the shoe, said apparatus comprising:

  • a member carried by the drive point for movement therewith, said member being movable between an extended position with a portion of the member extending into the recess to lock the point to the tube, and a retracted position with the member clearing the recess and sidewall to permit relative movement between the point and the tube;

    manually operable structure carried by the drive point and operably coupled with the member for moving the member between its extended and retracted positions; and

    wherein said point has an elongated threaded bore, said structure including a bolt threadably engaged in the bore for longitudinal movement in the bore responsive to manual rotation of the bolt, and means carried by the bolt and engageable with the member to cause the latter to move between said extended and retracted positions in response to said longitudinal movement of the bolt.

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