Door-operating mechanism
Abstract
Abstract THE DOOR-OPERATING MECHANISM IS FOR USE IN SEQUENTIALLY MANUALLY OPENING THEN AUTOMATICALLY CLOSING THEN AUTOMATICALLY OPENING AND THEN MANUALLY CLOSING A DOOR THAT IS ARRANGED TO BE URGED TOWARD ITS CLOSED POSITION BY GRAVITY, THE MECHANISM COMPRISING A FIRST LATCH MECHANISM HAVING A FIRST CONDITION FOR HOLDING THE DOOR IN ITS OPEN POSITION AND HAVING A SECOND CONDITION FOR RELEASING THE DOOR, A DOOR-OPENING WEIGHT CONNECTABLE TO THE DOOR FOR AUTOMATICALLY PIVOTING THE DOOR FROM ITS CLOSED POSITION TO ITS OPEN POSITION, A SECOND LATCH MECHANISM HAVING A FIRST CONDITION FOR CONNECTING THE DOOR-OPENING WEIGHT TO THE DOOR AND HAVING A SECOND CONDITION FOR HOLDING THE WEIGHT FREE OF THE DOOR, AN ACTUATOR FOR SELECTIVELY OPERATING THE FIRST AND SECOND LATCH MECHANISMS, AND A SELECTOR FOR SELECTIVELY RENDERING THE ACTUATOR OPERABLE TO CHANGE THE CONDITION OF ONLY ONE OF THE FIRST AND SECOND LATCH MECHANISMS AT ONE TIME.
Inventors
- 👤 Donald F Braun
Bibliographic Details
Claims Analysis
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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) | 1974-09-27 | 1975-03-29 | 1975-09-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-27 | 1979-03-29 | 1979-09-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-27 | 1983-03-29 | 1983-09-28 | $7700.00 | Window Closed / Lapsed |