Position detector for industrial vehicles

Details Position detector for industrial vehicles Position detector for industrial vehicles

1999-03-12

2000-10-31

Salata, Jonathan

Elevator, industrial lift truck, or stationary lift for vehicle

Industrial lift truck or required component thereof

Having safety cutoff control

187224, B66F 920

Patent

active

061387959

ABSTRACT:
An apparatus in a forklift for detecting the height of a fork in stages. Two sensors are arranged longitudinally on the mast. Each sensor includes a switch that has two states. The state of each switch can be changed by movement of the fork. Each switch is connected to input terminals of a controller. The signal at each input terminal changes between two levels in accordance with the state of a corresponding switch. A memory in the controller stores data that defines the relationship between ranges of movement of the fork, or zones, and the combination of the signals. The controller judges the height of the fork when the combination of signals corresponds to a combination that exists in the data. The controller judges that there is an abnormality when the combination does not exist in the data. This permits detection of malfunctioning switches and a cut and a short-circuited wiring.

REFERENCES:
patent: 4231450 (1980-11-01), Hedke et al.
patent: 4265337 (1981-05-01), Dammeyer
patent: 4411582 (1983-10-01), Nakada
patent: 4598797 (1986-07-01), Schultz
patent: 5749696 (1998-05-01), Johnson
patent: 5791440 (1998-08-01), Lonzinski et al.

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