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

• Current Assignee: Thomas L. Palfi
• Original Assignee: Thomas L. Palfi
• Inventors: Palfi, Thomas L.
• Application Number:
  US04/163,011
• Time in Patent Office: 1,231 Days
• US Class Current: 361/181
• CPC Class Codes: G07F 17/246 provided with vehicle proximity-detectors detecting hidden masses, e.g. metal detectors, G01V, e.g. G01V3/00; proximity switches per se H03K17/00; traffic control systems G08G1/00

Claims

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.