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Wall inspection device

  • US 3,943,756 A
  • Filed: 08/23/1974
  • Issued: 03/16/1976
  • Est. Priority Date: 08/27/1973
  • Status: Expired due to Term
First Claim
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1. A device for inspecting at a distance walls which are difficult of access, the device being used inter alia for inspecting cracks, threaded apertures and welds in the walls of a nuclear reactor vessel comprising a detector secured on a movable slide, guide rails secured to a frame B1 along which the slide moves, probes bearing on a wall being inspected and secured to a plate secured to frame B1 and parallel to the guide rails, each probe sending a signal proportional to the distance between the guide rails and the place where the probe bears on the wall to be checked, two motors M1 and M2 secured to a frame B2 controlled by electric signals from the probes and each actuating a pinion, the pinions engaging racks secured by pivots to frame B1 to the two ends of the guide rails, and a potentiometric monitoring device which stops the motors when the signals proportional to the distance between the wall and the guide rails and measured by the probes are equal to one another and to a control valve.

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