Safety-guard for a crane

Details Safety-guard for a crane Safety-guard for a crane

1972-06-26

1977-08-02

Blunk, Evon C.

Traversing hoists

Overhead

Cable

73141A, 177146, 177211, B66C 1348

Patent

active

040390845

ABSTRACT:
A safety-guard for a crane having a boom, comprising stress-detecting means which is provided to lifting hydraulic cylinder unit for the boom so as to detect a stress applied to the cylinder unit in the direction along the axis of said unit and to give out a signal, one or more functional potentiometers which correspond to respective spans of the boom and give out safety-limit stress-reduced signals at the concerned span of the boom respectively with the movement of movable contacts that are moved in response to the vertical revolution of the boom, and a safety device which receives said signals coming from the stress-detecting means and one of the functional potentiometers corresponding to the concerned span of the boom and indicates the concerned ratio of operation of the crane or gives a warning on falling-down and/or breaking-down of the crane. Thus, operator can catch operation state of the crane with ease for a safe operation of the crane.

REFERENCES:
patent: 2477854 (1949-08-01), Baker
patent: 2616683 (1952-11-01), Le Fevre
patent: 2761670 (1956-09-01), Fouretier
patent: 2765654 (1956-10-01), Greer et al.
patent: 3339652 (1967-09-01), Price
patent: 3489294 (1970-01-01), Greb et al.
patent: 3618064 (1971-11-01), Hamilton
patent: 3641551 (1972-02-01), Sterner et al.
patent: 3724679 (1973-04-01), Brownell et al.
patent: 3740534 (1973-06-01), Kezer et al.
patent: 3909817 (1975-09-01), Pietsch et al.

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