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Mast assembly

  • US 4,021,978 A
  • Filed: 02/25/1976
  • Issued: 05/10/1977
  • Est. Priority Date: 10/17/1973
  • Status: Expired due to Term
First Claim
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1. A telescoping, nestable multiple-section mast assembly, said mast assembly having a generally rectangular cross-section, an open V-door side and a closed drawworks side, said mast assembly being adapted for extension and retraction in a substantially horizontal condition with the V-door side up and comprising at least two mast sections, including a lower base mast section and an upper crown mast section;

  • each mast section of said assembly comprising four mast leg members defining the corners thereof and extending in a substantially mutually convergent manner from the lower base end to the upper crown thereof;

    the crown ends of each of said mast leg members of each lower mast section corresponding to and being in concentric and in-line arrangement with the base ends of the corresponding mast leg members of the adjacent upper mast section;

    connector means between each of said lower and upper mast leg members, each of said connector means comprisinga female connector bracket comprising at least a pair of parallel spaced apart side plate members affixed to and extending from the end of one of the mast leg members, said side plate members being disposed vertically and substantially equidistantly bracketing the extended centerline of said one of the mast leg members with the mast assembly in the horizontal V-door-side-up condition, and a ramp element located between said side plate members, said ramp element being adapted to engage and provide vertical guidance to the corresponding male connector bracket of the other of said mast leg members during extension and retraction of the mast assembly, anda corresponding male connector bracket comprising at least one plate element affixed to and extending from the end of the other of said mast leg members, said male connector bracket being disposed substantially along the extended centerline of said other of said mast leg members and each of the plate elements thereof being adapted for engagement into a corresponding space between the side plate members of said female connector bracket;

    connector pin receiving apertures through said side plate members and plate element of said female and male connector brackets, said apertures being located so as to be coaxially aligned with one another upon establishing said one and said other of said mast leg members in their extended, concentric and in-line arrangement with one another, andpin connector means adapted for insertion into said coaxially aligned apertures.

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