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Apparatus and method for determining torque, presenting digital torque readout and automatic cycling and termination of wrench operation in a torque wrench system

  • US 4,791,838 A
  • Filed: 11/12/1986
  • Issued: 12/20/1988
  • Est. Priority Date: 05/30/1986
  • Status: Expired due to Fees
First Claim
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1. Apparatus for automatic cycling and termination of operation of a fluid powered torque wrench supplied with operating fluid from a pump, including:

  • first control means for selecting a desired level of torque to be applied to a fastening element by the torque wrench;

    second control means connected to said first control means to receive a first signal from said first control means commensurate with said desired level of torque and initiate a tightening cycle of operation of the wrench;

    monitoring means for monitoring the pressure of the operating fluid in said wrench and generating a second signal commensurate with the torque imposed on a fastening element by said wrench;

    comparator means to compare said first and second signals and deliver a third signal to said second control means to interrupt the operation of the wrench; and

    said first control means analyzing the pressure history of the tightening cycle of operation of the wrench to initiate another cycle of tightening operation or terminate the tightening operation.

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