Shelf height selector

Details Shelf height selector Shelf height selector

B - Operations, Transporting

66

F

341/107

B66F 9/24 (2006.01)

Patent

CA 1163349

SHELF HEIGHT SELECTOR Abstract of the Disclosure: A shelf height selector system for a lift truck provides signals to an operator as he raises or lowers a load carriage relative to a storage shelf level selected by a keyboard in order to perform a store or retrieve operation, and automatically stops carriage movement with load forks at the proper elevation. Pulses from an incre- mental shaft encoder operated by carriage movement are counted to pro- vide an instantaneous elevation signal upon which indications to the operator and control functions depend. A switch on the truck mast is operated by carriage movement to repeatedly recalibrate a register containing the instantaneous elevation signal, obviating any errors should noise affect tallying of encoder counts. An optical sensor carried on the load carriage to sense reflective markers adjacent some shelves also recalibrates the register, obviating positioning errors due to mast deflection and tire wear. Provision of a simple programming arrangement allows storage of shelf heights in a non-volatile random-access memory, affording the advantages of a field-programmable system. -1-

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