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Shelf height selector

  • US 4,547,844 A
  • Filed: 02/17/1982
  • Issued: 10/15/1985
  • Est. Priority Date: 03/16/1979
  • Status: Expired due to Term
First Claim
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1. In a lift truck having means for vertically moving a load carriage up and down a mast, the combination of a rotary shaft encoder means connected to be operated by vertical movement of said carriage and operable to provide signals representing incremental vertical movement of said carriage;

  • a processor having an arithmetic unit, a read-only memory containing program instructions and data, random-access memory means including a non-volatile random-access memory unit, and means for transmitting and receiving data, said processor being connected to receive said signals representing incremental vertical movement of said carriage and operable by a portion of said instructions to increment and decrement a first register means in said memory means to provide data representing the current elevation of said carriage;

    a manually-operable keyboard means carried on said truck for selecting shelves at which loads are to be stored or retrieved, a first group of said instructions being operable in response to an entry on said manually-operable keyboard means to read elevation data from an address in said non-volatile memory unit computed from said entry and to control said means for moving said load carriage in accordance with a function of the difference between said elevation data and the contents of said first register means;

    a manually-controlled switch operable to provide a programming mode of operation, a second group of said instructions being operable in response to an entry on said manually-operable keyboard during said programming mode of operation to transfer the data from said first register means to an address in said memory unit computed from said entry during said programming mode of operation.

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