US3118167A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Door checking appliance
Assignee: Individual
•
Filing: 1960-10-24
•
Granted: 1964-01-21
•
Expires: 1980-10-24
Abstract
No abstract record available.
Inventors
- 👤 John N Morris
- 👤 Williams Ruth Margaret
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 16:00
CPC Classifications
E; E05; E05F; E05F3/00; E05F3/14; E05D; E05D11/00; E05D11/02; E05Y; E05Y2201/00; E05Y2201/20; E05Y2201/21; E05Y2201/252; E05Y2201/254; E05Y2201/262; E05Y2201/266; E05Y2900/00; E05Y2900/10; E05Y2900/13; E05Y2900/132
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
202 words
A DOOR CHECKING APPLIANCE INCORPORATED IN A DOOR HINGE HAVING TWO HINGE LEAVES ONE OF WHICH IS CONNECTED TO THE DOOR AND THE OTHER BEING CONNECTED TO THE FIXED STRUCTURE TO WHICH THE DOOR IS HINGED IN SUCH MANNER THAT OPENING AND CLOSING MOVEMENT OF THE DOOR PRODUCES RELATIVE ROTARY MOVEMENT BETWEEN THE TWO LEAVES, WHEREIN ONE OF SAID LEAVES HAS A HOLLOW CYLINDER CONNECTED THEREWITH, A SPINDLE MOUNTED ROTATABLY WITHIN SAID CYLINDER, THERE BEING AN ANNULAR SPACE BETWEEN THE SPINDLE AND THE CYLINDER INTERIOR WHICH IS OCCUPIED BY A DAMPING FLUID OF RELATIVELY HIGH VISCOSITY AND BOTH THE SPINDLE AND CYLINDER INTERIOR HAVING PORTIONS PROJECTING INTO SAID ANNULAR SPACE, AND A ONE-WAY CLUTCH DEVICE OPERATIVELY CONNECTED BETWEEN SAID SPINDLE AND THE OTHER HINGE LEAF AND ADAPTED TO FUNCTION SO THAT IN ONE DIRECTION OF RELATIVE ROTARY MOTION BETWEEN THE TWO HINGE LEAVES, THE CLUTCH DEVICE IS INOPERATIVE SO AS TO PERMIT THE SPINDLE AND CYLINDER TO ROTATE IN UNISON THROUGH THE PHYSICAL CONNECTION OF THE DAMPING FLUID WHILST IN THE OTHER DIRECTION OF RELATIVE ROTARY MOTION, THE CLUTCH IS OPERATIVE AND CAUSES RELATIVE ROTARY MOTION TO TAKE PLACE BETWEEN THE SPINDLE AND THE CYLINDER AGAINST THE RESISTANCE OF THE DAMPING FLUID.
Claim 2
Dependent Claim
202 words
A DOOR CHECKING APPLIANCE INCORPORATED IN A DOOR HINGE HAVING TWO HINGE LEAVES ONE OF WHICH IS CONNECTED TO THE DOOR AND THE OTHER BEING CONNECTED TO THE FIXED STRUCTURE TO WHICH THE DOOR IS HINGED IN SUCH MANNER THAT OPENING AND CLOSING MOVEMENT OF THE DOOR PRODUCES RELATIVE ROTARY MOVEMENT BETWEEN THE TWO LEAVES, WHEREIN ONE OF SAID LEAVES HAS A HOLLOW CYLINDER CONNECTED THEREWITH, A SPINDLE MOUNTED ROTATABLY WITHIN SAID CYLINDER, THERE BEING AN ANNULAR SPACE BETWEEN THE SPINDLE AND THE CYLINDER INTERIOR WHICH IS OCCUPIED BY A DAMPING FLUID OF RELATIVELY HIGH VISCOSITY AND BOTH THE SPINDLE AND CYLINDER INTERIOR HAVING PORTIONS PROJECTING INTO SAID ANNULAR SPACE, AND A ONE-WAY CLUTCH DEVICE OPERATIVELY CONNECTED BETWEEN SAID SPINDLE AND THE OTHER HINGE LEAF AND ADAPTED TO FUNCTION SO THAT IN ONE DIRECTION OF RELATIVE ROTARY MOTION BETWEEN THE TWO HINGE LEAVES, THE CLUTCH DEVICE IS INOPERATIVE SO AS TO PERMIT THE SPINDLE AND CYLINDER TO ROTATE IN UNISON THROUGH THE PHYSICAL CONNECTION OF THE DAMPING FLUID WHILST IN THE OTHER DIRECTION OF RELATIVE ROTARY MOTION, THE CLUTCH IS OPERATIVE AND CAUSES RELATIVE ROTARY MOTION TO TAKE PLACE BETWEEN THE SPINDLE AND THE CYLINDER AGAINST THE RESISTANCE OF THE DAMPING FLUID.
References Cited (Backward Citations)
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US2490258A
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US2775317A
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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) | 1967-01-20 | 1967-07-22 | 1968-01-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-01-20 | 1971-07-22 | 1972-01-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-01-20 | 1975-07-22 | 1976-01-21 | $7700.00 | Window Closed / Lapsed |