Fluid-operated apparatus for handling and lifting loads

Implements or apparatus for applying pushing or pulling force – Apparatus for hauling or hoisting load – including driven... – Device includes rotatably driven – cable contacting drum

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Details

254360, B66D 148, B66D 108

Patent

active

044783906

ABSTRACT:
Fluid-operated apparatus is provided for handling and lifting loads of various weights. The apparatus includes a fluid-operated hoist with an elongate member extending therefrom to a load-carrying unit. A pilot fluid-controlled regulator supplies fluid to the hoist and a load-responsive, pilot fluid regulator is carried by the load-carrying unit and supplies pilot fluid to the pilot fluid-controlled regulator. The pilot fluid is varied according to the weight of a load so that the pressure of the fluid supplied to the hoist is accordingly varied by the pilot fluid-controlled regulator to automatically balance the load carried by the load-carrying unit. The load can also be lifted by bypassing the pilot fluid-controlled regulator and controlling flow of fluid to the hoist by a manually-adjustable flow control valve. The apparatus also can include a brake for preventing the elongate member from moving up or down while loads are being changed or are at rest.

REFERENCES:
patent: 3260508 (1966-07-01), Powell
patent: 3325148 (1967-06-01), Powell
patent: 3384350 (1968-05-01), Powell
patent: 3428298 (1969-02-01), Powell
patent: 3457837 (1969-07-01), Powell
patent: 3526388 (1970-09-01), Geiger et al.
patent: 3656715 (1972-04-01), Powell
patent: 3756563 (1973-09-01), Stone
patent: 3758079 (1973-09-01), Workman, Jr. et al.
patent: 3933388 (1976-01-01), Conboy

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