Speed limiting method and apparatus for lift truck

Details Speed limiting method and apparatus for lift truck Speed limiting method and apparatus for lift truck

1996-05-13

1998-08-11

Noland, Kenneth

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

057914400

ABSTRACT:
A method and/or apparatus for reducing the maximum speed of a lift truck when a fork carriage exceeds a fork carriage trip height and a limit switch positioned at the trip height to detect trip height has failed. Using lift truck control signals, a calculated fork carriage height is determined and compared to the trip height which corresponds to the limit switch position. When the calculated height reaches the trip height and the limit switch does not provide a sensed signal, a latch is set in a non-volatile memory which limits the maximum truck speed until the limit switch is again operable.

REFERENCES:
patent: 4265337 (1981-05-01), Dammeyer

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