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Microprocessor-controlled hoist system

  • US 4,636,962 A
  • Filed: 05/24/1983
  • Issued: 01/13/1987
  • Est. Priority Date: 05/24/1983
  • Status: Expired due to Term
First Claim
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1. A load handling hoist system comprising:

  • load handling means for raising and lowering a load;

    microprocessor means for generating command signals controlling the raising and lowering of a load by said load handling means in accord with a program which controls operation of the load handling means;

    operator controlled means for entering instructing data into said microprocessor means to produce said command signals in accord with said program whereby the hoist system is correspondingly controlled by said microprocessor means to raise and lower a load;

    sensor means for generating periodic output signals indicative of increments of raising and lowering movements of the load handling means;

    said microprocessor means being programmed to identify vertical load travel limits under instruction data from said operator controlled means and to output command data when those limits are reached during subsequent operation so as to terminate load travel in correspondence with such limits; and

    said operator controlled means entering creep command data into said microprocessor means under control of an operator and said microprocessor means being programmed to generate time-separated load lowering command signals in response to said creep command data and said output signals from said sensor means.

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