Apparatus and method for improved tubular grip assurance

  • US 5,791,410 A
  • Filed: 01/17/1997
  • Issued: 08/11/1998
  • Est. Priority Date: 01/17/1997
  • Status: Expired due to Term
First Claim
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1. An apparatus for controlling the gripping and releasing of a tubular member, the apparatus comprising:

  • an elevator with a set of slips for optionally gripping and releasing a tubular member;

    and a spider with a set of slips for optionally gripping and releasing said tubular member, a pressure circuit in communication with said elevator and said spider slips, wherein said pressure circuit controls the supply of pressure to release one set of slips only when the other set of slips is gripping said tubular member, andwherein one set of slips is actuated by hydraulic pressure and the other set of slips is actuated by pneumatic pressure.

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