Patent ID: 6053341
Filing Date: 2000-04-25
Classification: B66C

Abstract:
A coupling, for use with a tubular boom section of an extendible crane boom, said tubular boom section comprising a tube having an inner end and an outer end and a holder mounted to said tube at said outer end, a double-acting hydraulic cylinder being attachable to said holder by said coupling, said coupling comprising:a male member and a female member, one of said male member and said female member being attachable to an outer end of said double-acting hydraulic cylinder and the other of said male member and said female member being attachable to said holder, and one of said male member and said female member comprising a substantially part-spherical surface and the other of said male member and said female member comprising an opposite surface in contact with said substantially part-spherical surface, andmeans comprising a plurality of screws coupling together said substantially part-spherical surface and said opposite surface for preventing pivotal movement of said double-acting hydraulic cylinder relative to said holder when said plurality of screws are tightened, and for permitting pivotal movement of said double-acting hydraulic cylinder relative to said holder when said plurality of screws are loosened.