Remotely controlled cyclic grapnel hook apparatus

Details Remotely controlled cyclic grapnel hook apparatus Remotely controlled cyclic grapnel hook apparatus

1977-03-23

1980-01-29

Marbert, James B.

Handling: hand and hoist-line implements

Hook, hoistline, or grab type

Locking device

B66C 138

Patent

active

041858646

ABSTRACT:
A remotely controlled cyclic grapnel hook apparatus includes a cylinder wh has a top and a bottom, the cylinder having a central bore axially therethrough and a counterbore in its top portion. A piston is slidably mounted in the cylinder counterbore, and a piston rod connected to the piston is slidably mounted in the cylinder bore therebelow. The piston and piston rod are biased downwardly by a spring which may be located in the cylinder counterbore. The cylinder has a passageway to the bottom of the counterbore so that fluid pressure can be applied or released therein for moving the piston and piston rod up or down in the cylinder against the force of the spring. At least one hook is pivoted to the bottom of the cylinder so as to extend outwardly therefrom. The hook has a camming surface which engages the side of the piston rod so that the hook is locked in an upward load carrying position when the piston rod is in a downward position and is free to pivot downwardly to a load releasing position when the piston rod is moved upwardly. With this arrangement the hook apparatus can be remotely controlled to repeatedly pick up and drop various payloads.

REFERENCES:
patent: 2673116 (1954-03-01), Baird
patent: 3127133 (1964-03-01), Glatfelter et al.
patent: 4095833 (1978-06-01), Lewis

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