Hydrostatic load relief for lifting spindles

Details Hydrostatic load relief for lifting spindles Hydrostatic load relief for lifting spindles

B - Operations, Transporting

66

F

254/137

B66F 3/08 (2006.01) F16H 57/04 (2006.01)

Patent

CA 1069879

ABSTRACT OF THE DISCLOSURE A lifting device having a rotating female threaded member and a non-rotating axially movable lifting spindle is load releaved by means of pressurized oil pumped to oil pockets in the threads of the female member. Multiple pumps are secured to the female member and are arranged in pairs with a common drive shaft and a pinion for each pair. The pin-ions all mesh with the internal gear of an annulus being concentrically arranged around the member and having an external gear for independent driving. The pumps are connected to the pockets by means of ducts, there being no fluid pass across moving interfaces. The pumps have a common suction feed which dips into an annular reservoir.

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