B - Operations – Transporting – 66 – F
Patent
B - Operations, Transporting
66
F
B66F 7/02 (2006.01) B66C 15/02 (2006.01) B66F 7/28 (2006.01)
Patent
CA 2080715
ABSTRACT A suspended work platform is disclosed for use with mobile cranes or other lifting devices. A safety line passes through an automatic locking device to prevent the platform from falling should the main crane lifting cable fail. The platform has a floor and a central, upright tube terminating in a spring loaded, telescopic suspension member. The automatic locking device is attached to the tube, with the safety line slidably retained therein. A linkage is coupled between the suspension member and the locking device to release the locking device upon lifting tension being applied to the suspension member by the crane lifting cable. A reel is mounted under the platform floor to take up the safety line as the platform is being raised, and a spring motor biases the reel to maintain tension in the safety line. The locking device clamps onto the safety line preventing the platform from falling in the absence of lifting tension on the suspension member.
Barrigar & Oyen
Borenstein Harry
LandOfFree
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