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Height control device and method for a fixture for machining an object essentially defined by a single plane

  • US 4,943,119 A
  • Filed: 11/22/1988
  • Issued: 07/24/1990
  • Est. Priority Date: 08/24/1988
  • Status: Expired due to Term
First Claim
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1. A height control device for a fixture for machining an object essentially defined by a single plane by means of a machining tool for changing the level height of the plane, in particularly for a milling fixture for stripping road surfacing comprising:

  • a first gauging device featuring a first ultrasonic transceiver for gauging the distance from the ultrasonic transceiver to the unmachined plane of the object,a second gauging device featuring a second ultrasonic transceiver for gauging the distance from the second ultrasonic transceiver to the machined plane,a signal generator connected to both gauging devices for generating a first signal representing the change in the level height due to machining from the quotient or difference of the distances measured by said first and second gauging devices, anda control device for elevating or lowering the machining fixture so that the signal representing the change in the level height due to machining essentially corresponds to a setpoint value for changing the level height due to machining.

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