US3136537A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Door opening mechanism
Assignee: Individual
•
Filing: 1961-10-03
•
Granted: 1964-06-09
•
Expires: 1981-10-03
Abstract
No abstract record available.
Inventors
- 👤 Paul M Whitfield
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 14:35
CPC Classifications
E; E05; E05F; E05F15/00; E05F15/60; E05F15/603; E05F15/611; E05F15/627; E05Y; E05Y2900/00; E05Y2900/10; E05Y2900/13; E05Y2900/132
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
231 words
MECHANISM FOR OPENING A DOOR THAT IS HINGED FOR ROTATION AROUND A VERTICAL AXIS AND IS EQUIPPED WITH A HYDRAULIC DOOR CHECK, COMPRISING (1) A QUADRANT MOUNTED FOR ROTATION AROUND AN AXIS THAT IS PARALLEL TO THE AXIS OF THE DOOR HINGES AND SPACED THEREFROM, SAID QUADRANT ENGAGING THE DOOR AT A POINT NEAR THE TOP THEREOF AND REMOTE FROM THE HINGES; (2) A DRUM JOURNALED FOR ROTATION AROUND AN AXIS THAT IS PARALLEL TO THE QUADRANT AXIS; (3) AN IDLER PULLEY MOUNTED ADJACENT THE DOOR ENGAGING END OF THE QUADRANT FOR ROTATION AROUND AN AXIS THAT IS PARALLEL TO THE AXIS OF THE DRUM; (4) A SPRING FIXED UPON THE QUADRANT NEAR THE DOOR ENGAGING END THEREOF; (5) A CABLE FIXED TO THE END OF THE QUADRANT REMOTE FROM THE DOOR ENGAGING END THEREOF, ENGAGED WITH THE ARCUATE PORTION OF THE QUADRANT, ENGAGED WITH SAID PULLEY, EXTENDED AROUND SAID DRUM A PLURALITY OF TIMES, THENCE TO SAID SPRING TO WHICH IT IS FASTENED, SAID SPRING BEING TENSIONED TO SNUB THE CABLE AROUND THE DRUM; (6) A MOTOR DRIVEN WHEEL JOURNALED FOR ROTATION AROUND THE AXIS OF THE DRUM; (7) AN ELECTROMAGNETIC CLUTCH FOR CONNECTING SAID DRUM TO SAID WHEEL; (8) AND MEANS FOR OPERATING THE CLUTCH THEREBY CONNECTING THE DRUM TO SAID WHEEL TO ROTATE THE DRUM AND MOVE THE QUADRANT AND DOOR FROM DOOR CLOSED TO DOOR OPEN POSITION.
Claim 2
Dependent Claim
231 words
MECHANISM FOR OPENING A DOOR THAT IS HINGED FOR ROTATION AROUND A VERTICAL AXIS AND IS EQUIPPED WITH A HYDRAULIC DOOR CHECK, COMPRISING (1) A QUADRANT MOUNTED FOR ROTATION AROUND AN AXIS THAT IS PARALLEL TO THE AXIS OF THE DOOR HINGES AND SPACED THEREFROM, SAID QUADRANT ENGAGING THE DOOR AT A POINT NEAR THE TOP THEREOF AND REMOTE FROM THE HINGES; (2) A DRUM JOURNALED FOR ROTATION AROUND AN AXIS THAT IS PARALLEL TO THE QUADRANT AXIS; (3) AN IDLER PULLEY MOUNTED ADJACENT THE DOOR ENGAGING END OF THE QUADRANT FOR ROTATION AROUND AN AXIS THAT IS PARALLEL TO THE AXIS OF THE DRUM; (4) A SPRING FIXED UPON THE QUADRANT NEAR THE DOOR ENGAGING END THEREOF; (5) A CABLE FIXED TO THE END OF THE QUADRANT REMOTE FROM THE DOOR ENGAGING END THEREOF, ENGAGED WITH THE ARCUATE PORTION OF THE QUADRANT, ENGAGED WITH SAID PULLEY, EXTENDED AROUND SAID DRUM A PLURALITY OF TIMES, THENCE TO SAID SPRING TO WHICH IT IS FASTENED, SAID SPRING BEING TENSIONED TO SNUB THE CABLE AROUND THE DRUM; (6) A MOTOR DRIVEN WHEEL JOURNALED FOR ROTATION AROUND THE AXIS OF THE DRUM; (7) AN ELECTROMAGNETIC CLUTCH FOR CONNECTING SAID DRUM TO SAID WHEEL; (8) AND MEANS FOR OPERATING THE CLUTCH THEREBY CONNECTING THE DRUM TO SAID WHEEL TO ROTATE THE DRUM AND MOVE THE QUADRANT AND DOOR FROM DOOR CLOSED TO DOOR OPEN POSITION.
References Cited (Backward Citations)
FR1032025A
Cited
US2728570A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-06-09 | 1967-12-09 | 1968-06-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-06-09 | 1971-12-09 | 1972-06-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-06-09 | 1975-12-09 | 1976-06-09 | $7700.00 | Window Closed / Lapsed |