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Hydraulic drilling rig and power swivel

  • US 3,949,818 A
  • Filed: 09/30/1974
  • Issued: 04/13/1976
  • Est. Priority Date: 09/30/1974
  • Status: Expired due to Term
First Claim
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1. A power swivel for a drilling derrick or the like, comprising:

  • a rotary drive assembly,a removable swivel stem assembly, said swivel stem assembly including a hollow shaft drivingly engaged with said rotary drive assembly and having a lower stem end for threadably engaging a pipe and an upper end, a rotary coupling joined to said upper end for connecting the hollow shaft with a source of fluid; and

    a pipe-holding assembly for holding a pipe against downward movement relative to said rotary drive assembly, said drive assembly including an outer main housing, said swivel stem assembly including an auxiliary housing, and locking means operatively securing said auxiliary housing to said main housing and providing for quick separation of said swivel stem assembly from said drive assembly.

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