Patent ID: 7768473
Filing Date: 2010-08-03
Classification: E04H

Abstract:
1. A portable telescopic mast assembly with positive retraction for raising and lowering an associated device, the mast assembly comprising: an outer body; a plurality of mast sections slideably engaged with the outer body; a lifting cable disposed between the plurality of mast sections, the lifting cable operatively connecting the plurality of mast sections so as to urge one or more of the mast sections towards an extended position, the lifting cable having a first end and a second end, the first end being secured to an inner most mast section of the plurality of mast sections; a retraction cable disposed at least partially inside the outer body, the retraction cable having a first end and a second end, the first end being secured to the inner most mast section; a winch secured to the outer body, the winch including a first output and a second output, the second end of the lifting cable operatively connected to the first output and the second end of the retraction cable operatively connected to the second output; and wherein at least one of the plurality of mast sections further includes an upper collar assembly and a lower collar assembly for operatively engaging the lifting cable.