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Apparatus for and method of folding a mast or derrick

  • US 9,016,004 B2
  • Filed: 03/15/2013
  • Issued: 04/28/2015
  • Est. Priority Date: 03/15/2013
  • Status: Active Grant
First Claim
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1. A folding mast apparatus having a back face and a pair of opposed sides with each of said opposed sides having a front leg and a back leg, which apparatus comprises:

  • at least one spreader beam assembly extending across said back face and connecting said back legs of said pair of opposed sides where each spreader beam assembly comprises two inner members and two outer channel members,where each of the two inner members extends between said back face and one of the two outer channel members with each of the two inner members pivotally connected to said back face and each of the two outer channel members extending between one of the two inner members and one said back leg such that, when in an open, use position, the two inner members are aligned with and lie in the same horizontal plane;

    at least one pair of telescoping braces extending between said at least one spreader beam assembly and said back legs; and

    a pair of mast folding cylinders, each of said mast folding cylinders extending between one of said back legs and said back face in order to move said pair of opposed sides between an open, use position and a closed, transportation position.

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