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Height indicator for a fork lift truck

  • US 5,011,358 A
  • Filed: 10/25/1988
  • Issued: 04/30/1991
  • Est. Priority Date: 10/25/1988
  • Status: Expired due to Term
First Claim
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1. A height indicator for use on a fork lift truck of the type having a vertically positionable fork operatively associated therewith, said height indicator for indicating to an operator of the fork lift truck the position of the fork with respect to a particular shelf of a shelving system within a warehouse independently of a control system of the fork lift truck, said height indicator comprising:

  • programmable memory means for storing information regarding the vertical location of a plurality of shelves of a shelving system, said information including a storage height and a retrieve height for each of the plurality of shelves,a first sensing means for tracking the vertical position of a fork of a fork lift truck and sending signals representative of the sensed vertical position,comparing means that receives the signals from said sensing means for comparing the sensed vertical position of the fork to the stored information of the vertical location of the plurality of shelves stored in said programmable memory means, anda first display means that receives signals from said comparing means for indicating to the operator as the fork is controlled by the operator when the fork is positioned within a preselected vertical range of a selected shelf of the plurality of shelves, said preselected vertical range encompassing both the storage height and the retrieve height for the selected shelf, whereby the operator can load or unload between the fork and the shelves based on the indication of the display means within the predetermined range.

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