Lift truck having height indicating means

Details Lift truck having height indicating means Lift truck having height indicating means

1977-10-06

1978-10-31

Sheridan, Robert G.

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

340 21, B65G 106, G05D 308

Patent

active

041229576

ABSTRACT:
Elevations of a lift truck load carrier relative to shelves of a storage rack are accurately indicated by photosensor means on the load carrier operated by light reflected from reflectors on the storage rack. Raising and lowering the load carrier rotates the shaft of a retractable cable reel. Photosensor signals operate a clutch which connects the reel shaft to rotate a potentiometer over a limited range of heights surrounding the desired load carrier heights for each shelf in a vertical stack of shelves.

REFERENCES:
patent: 707305 (1902-08-01), Curlett
patent: 972682 (1910-10-01), Craig
patent: 1057261 (1913-03-01), Norton
patent: 1135014 (1915-04-01), Harding
patent: 2246921 (1941-06-01), Kummer
patent: 3695463 (1972-10-01), Weisker et al.
patent: 3796322 (1974-03-01), Cording
patent: 3818302 (1974-06-01), Rutledge
patent: 4074794 (1978-02-01), Scholl

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