Traversing hoists – Overhead – Cable
Patent
1976-01-23
1978-03-14
Hoffman, Drayton E.
Traversing hoists
Overhead
Cable
340267C, B66C 1348
Patent
active
040786684
ABSTRACT:
A crane boom pivotal about a horizontal axis is monitored as to loading over a prolonged period, e.g. a period of about 24 hours, by providing a position-dependent output representing the maximum permissible load moment on the boom at a particular position thereof relative to its support and a load sensor responsive to the instantaneous loading (load moment) of the boom. These two sensors provide inputs to a quotient-forming comparator whose output is applied to a 24-hour disk or tape recorder. The output of the quotient-forming comparator also controls a device for immobilizing the drive system for the boom, preventing it from exceeding its maximum permissible load.
REFERENCES:
patent: 3489294 (1970-01-01), Greb et al.
patent: 3638211 (1972-01-01), Sanchez
patent: 3641551 (1972-02-01), Sterner et al.
patent: 3740534 (1973-06-01), Kezer et al.
patent: 3819922 (1974-06-01), Horn et al.
Hoffman Drayton E.
Johnson R. B.
Kruger & Co. KG
Ross Karl F.
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