Hydrostatic load relief for lifting spindles

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

1978-05-22

1979-11-06

Watson, Robert C.

Implements or apparatus for applying pushing or pulling force

Screw

184 1R, B66F 308

Patent

active

041733304

ABSTRACT:
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 pinions 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.

REFERENCES:
patent: 2352117 (1944-06-01), Parternach
patent: 3064758 (1962-11-01), Ohrnberger
patent: 3651706 (1972-03-01), Galbarini et al.

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