Patent ID: 6041558
Filing Date: 2000-03-28
Classification: E04H

Abstract:
A rapidly extendible and retractable antenna mast structure comprising:an elongated base assembly of tubular cross-section and having a lower end and an upper end defining an elongated upwardly open cavity, means for mounting said base assembly to a vehicle,windlass means mounted to said base assembly, and a fixed pulley block secured to said base assembly intermediate said lower and upper ends thereof,a first cable having one end secured to said windlass means, and a movable pulley between said windlass means and said fixed pulley block,said first cable provided around said movable pulley of said movable pulley, and said first cable having an end opposite said one end secured to said lower end of said base assembly,a second cable having one end secured to said movable pulley block, said second cable provided over said fixed pulley, and said second cable having an opposite end inside said elongated cavity of said base assembly,a second elongated tubular subassembly slidably received in said elongated cavity of said base assembly and having a lower end supported by said second cable opposite end,and a third subassembly slidably received in said second tubular subassembly adapted to support an antenna.