×

System for erecting an oil well derrick

  • US 3,922,825 A
  • Filed: 12/30/1974
  • Issued: 12/02/1975
  • Est. Priority Date: 04/20/1973
  • Status: Expired due to Term
First Claim
Patent Images

1. A method of erecting an oil well derrick from a reclining position to an upright position, comprising the steps of:

  • positioning a stationary base at a well site, connecting a movable base to said stationary base by means that will allow the movable base to be elevated relative to said stationary base, connecting a reclining derrick mast to the movable base by a rotatable connection, elevating said movable base relative said stationary base, and rotating said mast on the rotatable connection until the mast is in its erect position.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×