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Drive for moveable shield in luggage screening apparatus

  • US 4,210,811 A
  • Filed: 09/22/1978
  • Issued: 07/01/1980
  • Est. Priority Date: 11/03/1975
  • Status: Expired due to Term
First Claim
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1. In a radiation-screening apparatus for inspecting sealed articles such as parcels and luggage, including a moveable shield selectively enclosing a monitoring duct, and drive means for moving said shield with respect to a fixed housing of said apparatus, the improvement comprising wherein:

  • said drive means comprises;

    an electromagnetically operable linear motor means having a rail and a stator, one of said rail and stator being attached to the shield and the other being fixed in the housing; and

    motor control means connected to said linear motor means and to an electrical power supply, said control means including three proximity switches and an activator, said switches and activator being mounted to be moveable relative to each other, two of said switches comprising limit end switches terminating electrical power to drive said linear motor at opposite ends of travel of said shield and the third proximity switch comprising a braking switch reducing electrical power to said linear motor between opposite ends of travel of said shield.

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