Back-up power tongs and method

  • US 4,402,239 A
  • Filed: 03/13/1981
  • Issued: 09/06/1983
  • Est. Priority Date: 04/30/1979
  • Status: Expired due to Fees
First Claim
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1. An apparatus for preventing axial rotation of a pipe member by a rotary tong assembly having downward extending leg portions affixed to said rotary tong assembly, said apparatus comprising:

  • a body member having an open throat portion for receiving said pipe member and a plurality of apertures for receiving said downward extending leg portions of said rotary tong assembly,first and second gripping members within said body member each linearly and radially movable toward said pipe member,first and second powered cylinder means each pivotably mounted within said body member and interconnected with one of said gripping members for urging said gripping members into engagement with said pipe member,power supply means connected to both said first and second cylinder means for simultaneous activation of said gripping member,first and second pivotally mounted lever means each pivotably connected with a respective one of said cylinder means and in engagement with a respective one of said gripping members for increasing the force exerted on said pipe member by said gripping members in response to said cylinder means, anda bracing block member affixed within said body member in a position opposite said open throat with respect to said gripping members for providing pivotable support for said lever means and preventing said open throat portion of said body member from spreading.

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