Automatic phase control for traffic lights

• US 3,149,306 A
• Filed: 05/18/1962
• Issued: 09/15/1964
• Est. Priority Date: 05/18/1962
• Status: Expired due to Term

• Current Assignee: John C. Lesher
• Original Assignee: John C. Lesher
• Inventors: Lesher, John C.
• Application Number:
  US04/195,876
• Time in Patent Office: 851 Days
• US Class Current: 340/916
• CPC Class Codes: G08G 1/07 Controlling traffic signals

Claims

1. AN AUTOMATIC PHASE CONTROL SYSTEM FOR SEQUENTIAL OPERATION OF TRAFFIC LIGHTS FROM AN ALTERNATING CURRENT POWER SOURCE COMPRISING CIRCUIT MEANS, AN ALTERNATING CURRENT ENERGIZING MEANS THEREFOR INCLUDING DUAL TERMINAL MEANS, A CYCLE CONTROLLED SINGLE POLE DOUBLE-THROW SWITCH MEANS OPERATIVELY CONNECTED TO SAID CURRENT ENERGIZING MEANS, RECTIFIED CURRENT MEANS INCLUDING RESISTIVE CURRENT LIMITING MEANS ENERGIZED BY SAID SWITCH MEANS, A FIRST RELAY MEANS INCLUDING DUAL ARMATURE MEANS AND DUAL CONTACTS THEREFOR, ONE ARMATURE AND CONTACT BEING NORMALLY CLOSED WITH ONE ARMATURE AND A NORMALLY OPEN CONTACT COOPERATING WITH THE OTHER ARMATURE BEING NORMALLY OPEN WITH RESPECT TO SAID ARMATURE, SAID ARMATURE COOPERATING WITH SAID SWITCH MEANS, AN ENERGIZING RECTIFIED CURRENT MEANS FOR SAID FIRST RELAY MEANS FROM ONE TERMINAL OF THE ALTERNATING POWER SOURCE THROUGH SAID SWITCH MEANS AND THE WINDING OF SAID RELAY TO THE OTHER TERMINAL OF THE POWER LINE, A SECOND RELAY MEANS HAVING A SINGLE ARMATURE MEANS AND DUAL CONTACT MEANS, ONE CONTACT MEANS BEING NORMALLY CLOSED WITH RESPECT TO SAID ARMATURE MEANS AND ONE CONTACT MEANS BEING NORMALLY OPEN WITH RESPECT TO SAID ARMATURE MEANS, A SECOND RECTIFYING CURRENT MEANS CONNECTED TO SAID ALTERNATING CURRENT ENERGIZING MEANS INDEPENDENTLY OF SAID SWITCH MEANS OPERATIVELY ENERGIZING SAID SECOND RELAY MEANS, SAID NORMALLY CLOSED CONTACT MEANS OF SAID FIRST RELAY MEANS SEQUENTIALLY CONNECTING ONE TERMINAL OF SAID ALTERNATING CURRENT POWER LINE TO A