Method and apparatus for erection and disassembly of a sectional mast assembly
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United States of America Patent
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Jan 15, 2013
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N/A
app pub date -
Feb 16, 2011
filing date -
Apr 30, 2010
priority date (Note) -
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Abstract
A method and an apparatus for a sectional mast assembly for erection and disassembly of a rig. The sectional mast assembly includes a bottom section having at least a back and a pair of opposed sides with each of the opposed sides having at least one pivoting ratchet support. A scoping dog assembly is moveable on a track on the bottom section. The scoping clog assembly includes wheels which engage the track and a pivoting ratchet support. A cylinder extends between the bottom section and the scoping dog assembly to move the scoping dog assembly on the track. The pivoting ratchet support of the scoping dog assembly engages each of the mast sections in sequence to raise the entire mast assembly.
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