Patent ID: 7377398

Claim:
A portable knockdown trolley hoist, comprising: an overhead trolley support member having a top lateral portion, a bottom lateral portion, a lateral axis, and opposing ends, said top lateral portion and said bottom lateral portion opposing one another about said lateral axis, said top lateral portion and said bottom lateral portion transverse to said opposing ends; a trolley having a plurality of upper roller bearings, a plurality of lower roller bearings, opposing first mounting plates, an extension boom, and a hoist, said plurality of upper roller bearings substantially equally spaced apart and said plurality of lower roller bearings substantially equally spaced apart, said plurality of upper roller bearings and said plurality of lower roller bearings opposing one another, each having shafts transversely mounted to said opposing first mounting plates, said plurality of upper roller bearing shafts laterally spaced apart along the length of said opposing first mounting plates, said plurality of lower roller bearing shafts laterally spaced apart along the length of said opposing first mounting plates, said plurality of upper roller bearings above and adjacent said top lateral portion of said overhead trolley support member, said plurality of lower roller bearings below and adjacent said lower lateral portion of said overhead trolley support member, said trolley rollably mounted to said overhead trolley support member and rollably sandwiching said top lateral portion and said bottom lateral portion of said overhead trolley support member between said plurality of upper roller bearings and said plurality of lower roller bearings, said extension boom having a first portion fastened to said trolley and a second portion extending laterally from said trolley substantially collinear with said lateral axis of said overhead trolley support member, said second portion of said extension boom having a sheave mounted thereto, said hoist having a winch and a hoist cable, said hoist cable extending from said winch and about said sheave and having a lifting end; opposing raised end support members; opposing raised end mounts, each said opposing raised end mount having opposing second mounting plates removably fastened to and sandwiching a said opposing end of said overhead trolley support member and a said opposing raised support member one to the other between said opposing second mounting plates; a plurality of opposing substantially upright legs, each said opposing raised end support member having at least two of said plurality of opposing substantially upright legs removably fastened thereto.