Position indicating devices

• US 3,108,213 A
• Filed: 03/28/1960
• Issued: 10/22/1963
• Est. Priority Date: 03/31/1959
• Status: Expired due to Term

• Current Assignee: Alexander Golder Jack, Raymond Pendleton Joseph, Richard Smart
• Original Assignee: Alexander Golder Jack, Raymond Pendleton Joseph, Richard Smart
• Inventors: ALEXANDER GOLDER JACK, Smart, Richard, RAYMOND PENDLETON JOSEPH
• Application Number:
  US04/018,013
• Time in Patent Office: 1,303 Days
• US Class Current: 318/657
• CPC Class Codes: G01D 5/125 characterised by a first part whose movement represents the measuring value, and by a second part which is moved by an external force in order to follow the movement of the first part
• CPC Class Codes: G01D 5/2216 by a movable ferromagnetic element, e.g. a core
• CPC Class Codes: G21C 17/10 Structural combination of fuel element, control rod, reactor core, or moderator structure with sensitive instruments, e.g. for measuring radioactivity, strain
• CPC Class Codes: G21C 17/12 Sensitive element forming part of control element
• CPC Class Codes: Y02E 30/30 Nuclear fission reactors

Claims

1. IN COMBINATION WITH A POSITION INDICATING DEVICE OF THE KIND COMPRISING A MEMBER OF MAGNETIC MATERIAL MOVABLE IN DIFFERENTIALLY WOUND COILS TO GIVE AN ERROR SIGNAL FROM A BRIDGE CIRCUIT, INCLUDING SAID DIFFERENTIALLY WOUND COILS, WHEN THE MEMBER OF MAGNETIC MATERIAL AND SAID DIFFERENTIALLY WOUND COILS ARE UNSYMMETRICALLY DISPOSED WITH RESPECT TO ONE ANOTHER, MEANS FOR MOVING SAID DIFFERENTIALLY WOUND COILS SERVOWISE ACCORDING TO THE ERROR SIGNAL TO RESTORE THE COILS TO A POSITION SYMMETRICAL WITH THE MEMBER OF MAGNETIC MATERIAL, THE ADDED FEATURE OF A SECOND BALANCING BRIDGE CIRCUIT HAVING SAID DIFFERENTIALLY WOUND COILS TOGETHER AS ONE ARM THEREOF, SAID SECOND BALANCING BRIDGE CIRCUIT BEING BALANCED WHEN THE MEMBER OF MAGNETIC MATERIAL IS IN THE COILS AND UNBALANCED WHEN THE MEMBER OF MAGNETIC MATERIAL IS COMPLETELY OUTSIDE THE COILS, MEANS FOR DETECTING THE UNBALANCE IN SAID SECOND BALANCING BRIDGE CIRCUIT, AND MEANS FOR DRIVING THE COILS TO RESTORE BALANCE IN SAID SECOND BALANCING BRIDGE CIRCUIT.