Clutch drag controls for hoist drum

192 clutches and power-stop control – Clutch and brake

Patent

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Details

192 4R, 192 17A, 254367, B66D 126, F16D 6702

Patent

active

042614511

ABSTRACT:
A hoist drum control includes a drum clutch control pressure graduating valve (15) connected between a pressure air source (14) and a shuttle valve (21), the latter being connected in a line to the drum drive clutch cylinder (25). Quick release valves (22, 24) are disposed closely adjacent the clutch cylinder and the shuttle valve for releasing pressure in the clutch cylinder line. An adjustable drag regulator (16) and air supply poppet valve (17) is connected between the air source and the shuttle valve (21) and is actuatable to supply low pressure to the drum drive clutch cylinder (25) for dragging. A momentary return of the drum from dragging to full speed is accomplished by momentarily shifting the said pressure graduating valve (15) to an out-of-neutral mode to supply high pressure to the drum drive clutch cylinder (25). A normally open relay valve (20) is disposed in the line between the regulator (16) and poppet valve (17) and one side of the shuttle valve (21). A flow control valve (19) is connected between the pressure graduating valve (15) and the relay valve (20) and functions to permit opening or closing the latter. Pressurized air flows freely through the flow control valve (19) toward the relay valve (20), but is metered in the reverse direction to provide a time delay when shifting from momentary high pressure back to low drag pressure so that the low pressure is not applied to the drum clutch cylinder line (52) until said line is devoid of high pressure.

REFERENCES:
patent: 2703162 (1955-03-01), Keim, et al.
patent: 2947397 (1960-08-01), Pietsch
patent: 2948412 (1960-08-01), Nix
patent: 3268211 (1966-08-01), Schlechter, et al.
patent: 3291451 (1966-12-01), Trollope
patent: 3651905 (1972-03-01), Brown
patent: 3939950 (1976-02-01), Nishida, et al.
patent: 4029189 (1977-06-01), Freiburger
patent: 4143856 (1979-03-01), Morrow

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