Load limiting device

Details Load limiting device Load limiting device

B - Operations, Transporting

66

F

138/71.1

B66F 9/20 (2006.01) B66F 17/00 (2006.01)

Patent

CA 1046380

LOAD LIMITING DEVICE A B S T R A C T A load lifting apparatus includes a primary load mem- ber pivotally mounted on a frame, and a tilt cylinder pivot- ally mounted on a frame, and a tilt cylinder pivotally connected to the frame and the primary load member to provide movement therebetween. A secondary load member is movable relative to the primary load member, and a lift cylinder is connected to the primary load member and the secondary load member to provide relative movement therebetween. Prevention from overbalancing is provided by sensing a moment created by a load on the apparatus. A valve simultaneously senses a lift pressure force proportional to a lift pressure in a head end of the lift cylinder and a tilt pressure force propor- tional to a tilt pressure in a rod end of the tilt cylinder. The valve blocks flow of pressurized fluid from the tilt cylin- der to the tilt cylinder valve and from the lift cylinder valve to the lift cylinder responsive to the greater of the lift pressure force and the tilt pressure force exceeding a prede- termined value. This is particularly useful in lift trucks wherein the primary load member is a lift truck mast and the secondary load member is the forks of a lift truck.

271232

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