Traversing hoists – With haul-in line
Patent
1978-08-04
1980-08-12
Sheridan, Robert G.
Traversing hoists
With haul-in line
340685, 340810, B66C 1348
Patent
active
042168686
ABSTRACT:
A crane operating aid comprises a load moment computer and a number of sensors which monitor crane parameters, such as boom length, boom angle, slewing angle, and boom reaction forces. The computer then calculates the percentage of load capacity as a function of the crane manufacturer's published load rating tables. Absolute encoding digital optical sensors are employed to monitor linear or angular displacement between portions of the crane which are operatively moveable with respect to one another. The digital output signals from the various sensors are then fed to the computer for use in its calculations. Each sensor comprises a detector made up of a light emitting element which is spaced from a light receiving element and an encoder disc which is mounted for displacement with respect to the detector and operates to present a series of tracks intermediate the light emitting portion and light receiving portion of the detector. Each track comprises a series of alternatingly opaque and transparent portions. By moving the encoder disc with respect to the detector, digitally encoded information is imparted to the detector representative of the displacement of the portions of the crane being monitored. An outage detector monitors the light emitting portion of the detector and generates a fault condition signal upon the failure of any of the light sources within the light emitting portion.
REFERENCES:
patent: 3381288 (1968-04-01), Van Vlodrop
patent: 3489294 (1970-01-01), Greb et al.
patent: 3710368 (1973-01-01), Hamilton
patent: 4037742 (1977-07-01), Gustafsson
Eaton Corporation
Lewis J. G.
McCloskey R. J.
Sheridan Robert G.
Wood D.
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