Patent ID: 6983856

Claim:
A portable crane for attachment to an upright frame member, comprising: a) a vertically extending support member having upper and lower clamp members on one side thereof for attachment to said frame member; b) a vertically extending base frame having an upper and lower end; c) first and second hinged couplings disposed on said base frame connected to an opposite side of said support member allowing said base frame to rotate in a vertical plane around said support member; d) said upper and lower clamp members being C-clamps horizontally aligned with said first and second hinged couplings, wherein said upper and lower clamp members can be quick connected to said frame member and then quick disconnected from said said frame member, said support member rigidly connecting said upper clamp member to said lower clamp member to provide extra support to said upper and lower clamp members; e) said first hinged coupling being fixedly connected to said upper end of said support member and said second hinged coupling being fixedly connected to said lower end of said support member; f) a boom having a first and second end, said first end of said boom being fixedly connected to said lower end of said base frame; g) stabilizer member having a first and second end, said first end of said stabilizer member fixedly connected to said upper end of said base frame and said second end of said stabilizer member fixedly connected to said second end of said boom to provide stability to the boom; h) a roller member disposed on said second end of said boom; i) a flexible line having a first and second end, wherein said flexible line passes over said roller, wherein said second end of said flexible line is for attachment to an article to be lifted by the portable crane; j) a winch disposed on and between said first and second ends of said boom with said first end of said flexible line can be wound on said winch in order to hoist an article to be lifted by the portable crane; and k) said winch comprising a windlass for receiving said first end of said flexible line, a motor for driving said windlass, and means for connecting said motor to said windlass in order to drive said windlass.