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Proximity-detectors for parking meters and the like

  • US 3,183,411 A
  • Filed: 12/27/1961
  • Issued: 05/11/1965
  • Est. Priority Date: 12/27/1961
  • Status: Expired due to Term
First Claim
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1. A CONTROL CIRCUIT FOR A PARKING METER HAVING A RESET ELECTROMAGNET, INCLUDING VEHICLE-RESPONSIVE MEANS ADAPTED TO BE SHIFTED FROM ITS NORMAL CONDITION IN THE ABSENCE OF A VEHICLE TO A RESET-SUPPRESSING CONDITION WHEN A VEHICLE IS IN CONTROL PROXIMITY THERETO, BISTABLE MEANS, SAID VEHICLE RESPONSIVE MEANS AND SAID BISTABLE MEANS BEING CONNECTED TO SAID ELECTROMAGNET IN "AND" CONTROL RELATION THERETO, AND A CONTROL CONNECTION FROM SAID VEHICLE RESPONSIVE MEANS TO SAID BISTABLE MEANS EFFECTIVE TO SET SAID BISTABLE MEANS IN ITS STABLE ELECTROMAGNETOPERATING CONDITION WHEN SAID VEHICLE-RESPONSIVE MEANS ITS PROPERLY OPERATIVE AND IN SAID RESET-SUPPRESSING CONDITION, WHEREBY WHEN SAID VEHICLE RESPONSIVE MEANS RESPONDS PROPERLY TO THE DEPARTURE OF A VEHICLE AND CONSEQUENTLY SHIFTS TO ITS NORMAL CONDITION BOTH THE BISTABLE MEANS AND SAID VEHICLE RESPONSIVE MEANS ARE IN CONDITION TO CAUSE OPERATION OF THE ELECTROMAGNET.

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