Twistlock operating mechanism

Details Twistlock operating mechanism Twistlock operating mechanism

1985-01-31

1986-12-23

Marbert, James B.

Handling: hand and hoist-line implements

Spacing hoist bar or frame

Load supporting units

294907, B66C 142

Patent

active

046308563

ABSTRACT:
Twistlocks of a container spreader are operated and controlled by hydraulic cylinders and interlock valves connected in series. Interlock valves block the flow of fluid through the cylinders when insertion of the twistlocks in their mating connectors is incomplete. Parallel fluid ports at the inlet and outlet of the cylinders permit the inlet and outlet to be connected, at the ends of the hydraulic cylinder's piston stroke, to compensate for different volume requirements of the hydraulic cylinders.

REFERENCES:
patent: 3493258 (1970-02-01), Wyrough
patent: 3871697 (1975-03-01), Bechtloff
patent: 3885676 (1975-05-01), Wilson
patent: 3892436 (1974-07-01), Fathauer
patent: 4245271 (1981-01-01), Gwin
patent: 4396218 (1983-08-01), Stevens
patent: 4402543 (1983-09-01), Simpson
patent: 4444426 (1984-04-01), Taylor

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