Blocking arrangement in hydraulically operated cranes

Details Blocking arrangement in hydraulically operated cranes Blocking arrangement in hydraulically operated cranes

1972-05-02

1976-06-15

Makay, Albert J.

Traversing hoists

Overhead

Cable

212 39MS, 212 55, 212144, 91388, B66C 1348, B66C 2306

Patent

active

039631273

ABSTRACT:
In hydraulically operated loading cranes, particularly loading cranes comprising multiple loading arms, a blocking device in the form of a return piston arranged, upon occurrence of an excessive pressure in the master cylinder, to prevent operation of piston-and-cylinder units actuating the loading arms in a direction away from the loading crane post but permit operation in the reverse direction, i.e. movement of the loading arms towards the post. The blocking device thus ensures that the moment of loading on the crane arms never reaches a value involving risks that the crane will tip over.

REFERENCES:
patent: 3007593 (1961-11-01), Hancock
patent: 3035710 (1962-05-01), Pohl
patent: 3141562 (1964-07-01), McAdams

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