Handling: hand and hoist-line implements – Spacing hoist bar or frame – Load gripping units
Patent
1975-05-19
1977-04-12
Maslousky, Paul E.
Handling: hand and hoist-line implements
Spacing hoist bar or frame
Load gripping units
214620, 91217, 91414, F01B 1502, B66C 166, F15B 1306
Patent
active
040171108
ABSTRACT:
A hydraulic cylinder assembly in which cylinders are separated into two coaxial cylindrical portions sealed hydraulically one from the other, one having an extensible piston therein and the other being extensible together with the extensible piston on a fixed supporting piston. In an exemplary embodiment two such cylinder assemblies are mounted to operate in opposite directions within various predetermined fixed limits of extension to control the extension of a telescopic spreader frame for handling containers to selected ones of such fixed limits. For different combinations of such fixed limits of extension in one or more selected installations, different length spacers are used at the time of assembly in the cylinder assemblies to establish various fixed and predetermined intermediate extensions between full extension and full retraction thereof. A hydraulic control system for the cylinder assemblies includes first and second valves and conduits variously connecting the valves to both cylinder portions of both cylinder assemblies.
REFERENCES:
patent: 3070071 (1962-12-01), Cooper
patent: 3187637 (1965-06-01), Edmund
patent: 3245560 (1966-04-01), Killebrew
patent: 3266377 (1966-08-01), Panissidi
patent: 3576269 (1971-04-01), Shaffer
patent: 3750814 (1973-08-01), Allegri
patent: 3752346 (1973-08-01), Thompson et al.
Pease Bobbylee
Simpson Clark C.
Clark Equipment Company
Maslousky Paul E.
Wiessler John C.
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