Pneumatic system for telescopic hoist

Details Pneumatic system for telescopic hoist Pneumatic system for telescopic hoist

1990-05-11

1992-03-31

Look, Edward K.

Motors: expansible chamber type

Fluid supply through diverse paths to single expansible chamber

Position responsive

91 31, 91168, 91173, 91176, 91189R, 91407, 91409, 92 52, 92 85B, F15B 1522, F01B 720

Patent

active

050997483

ABSTRACT:
A telescopic pneumatic hoist has a flexible stationary hollow probe on its base arranged to unseat a check ball in the piston of the lowest intermediate stage when the piston is near the base. When such a condition exists, the probe closely interfits with the piston and has a radial port communicating with the underside of the piston. The probe connects at the bottom with a supply and exhaust passage which also communicates with the underside of the piston via a check valve controlled secondary passage.

REFERENCES:
patent: 165472 (1875-07-01), Brickerhoff
patent: 1465365 (1923-08-01), Ross
patent: 2464962 (1949-03-01), Bent
patent: 3188917 (1965-06-01), Quayle
patent: 3415169 (1968-12-01), Naddell
patent: 3534659 (1970-10-01), Payson
patent: 3552267 (1971-01-01), Bushnell
patent: 3808946 (1974-05-01), Bell et al.
patent: 3838625 (1974-10-01), Bell et al.
patent: 4088061 (1978-05-01), Stoll et al.
patent: 4191092 (1980-03-01), Farmer
patent: 4397218 (1983-08-01), Spring

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