Electromagnetically operated display device
Abstract
Abstract THE INVENTION CONTEMPLATES A DISPLAY DEVICE IN WHICH A DISPLAY MEMBER AND A PERMANENT-MAGNET DRIVE MEMBER ARE INDEPENDENTLY MOUNTED FOR PIVOTAL OSCILLATION ON SPACED FRAME-BASED AXES. FRAME-BASED MAGNETIC CORE AND EXCITATION WINDINGS ARE PULSE-ACTUATED TO SHIFT THE DRIVE MEMBER TO ONE OR TO THE OTHER OF ITS TWO ANGULARLY SPACED AT-REST POSITIONS. THE POLARITY OF PERMANENT MAGNETISM IS SUCH, IN TERMS OF THE ANGULARLY SPACED LIMITS OF DRIVEMEMBER MOVEMENT, THAT THE DRIVE MEMBER IS SELF-RETAINED AT ITS LIMIT POSITION, WITHOUT NEED FOR EXCITATION. A SWITCH DEVICE TRACKS DRIVE-MEMBER MOVEMENT TO REVERSE THE WINDING EXCITATION CONNECTIONS, THUS CONDITIONING THE DISPLAY DEVICE FOR RESPONSE TO THE NEXT EXCITATION PULSE. FOR ANY GIVEN ACTUATIO, STARTING RESISTANCE IS MINIMIZED BY USING LOST-MOTION CONNECTION TECHNIQUES TO LINK THE DRIVEN MEMBER IN OPERATIVE RELATION WITH THE DISPLAY MEMBER AND WITH THE SWITCH DEVICE, THE ARRANGEMENT BEING SUCH THAT, WHATEVER THE DIRECTION OF ACTUATION, THE LOSTMOTION MUST FIRST BE TRAVERSED BEFORE EFFECTIVE DRIVING TORQUES ARE IMPARTED TO THE DISPLAY MEMBER OR TO THE SWITCH DEVICE.
Inventors
- 👤 Norman D Deshier
- 👤 Gereld L Tawney
Bibliographic Details
Claims Analysis
Total Claims: 0References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-02-01 | 1974-08-03 | 1975-02-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-01 | 1978-08-03 | 1979-02-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-01 | 1982-08-03 | 1983-02-02 | $7700.00 | Window Closed / Lapsed |