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Working tool operation range limiting apparatus

  • US 5,490,081 A
  • Filed: 01/14/1994
  • Issued: 02/06/1996
  • Est. Priority Date: 05/19/1992
  • Status: Expired due to Fees
First Claim
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1. A working tool operation range limiting apparatus for use with an earth working machine which has a working tool and an operation position detecting means, said working tool having a plurality of arms which are extendably and contractibly linked with each other, said working tool being pivoted at the forward end of said arms, said apparatus comprising:

  • a first control unit for designating at least one hazard region and a corresponding decelerating region to upward, downward, forward, and sideward positions of said earth working machine individually or in combinations thereof, for decelerating a working tool velocity which corresponds to a predetermined decelerating pattern when a member of said working tool reaches said decelerating region, and for stopping said working tool just before the member of said working tool reaches said hazard region; and

    a second control unit for comparing a first working tool velocity which corresponds to a predetermined decelerating pattern stored in said first control unit with a second working tool velocity which corresponds to the amount of operation of at least one manual working tool lever and for driving said working tool at the smaller one of said first working tool velocity and said second working tool velocity.

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