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Power-wrench, a boiling spindle and an operational method

  • US 4,813,312 A
  • Filed: 05/01/1987
  • Issued: 03/21/1989
  • Est. Priority Date: 06/14/1986
  • Status: Expired due to Fees
First Claim
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1. In a power-wrench bolting spindle comprising:

  • (a) a drive shaft and an output shaft which is axially displaceable with respect to the drive shaft against a spring force, the improvement comprising;

    (b) a depth sensor comprising means for measuring the depth of bolting wherein;

    (b1) a transmitting end of the drive shaft delivering the torque is supported in axially displaceable manner within a receiving end of the output shaft receiving the torque; and

    (b2) a coil is mounted within a sleeve of the bolting spindle enclosing at least part of said drive shaft and of said receiving end, said receiving end being displaceable within said coil and concurrently changing inductance of said coil, said change in inductance generating a signal indicative of said depth of bolting.

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