Patent US3620243A successfully refreshed from Google Patents.
Patent US3585757A successfully refreshed from Google Patents.
US3585757A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Overhead opening plug door
Assignee: McDonnell Douglas Corp
•
Filing: 1969-07-03
•
Granted: 1971-06-22
•
Expires: 1989-07-03
Abstract
Abstract An overhead opening plug door for a pressurized aircraft cabin wherein the door is counterbalanced for manual emergency opening in event of power failure, yet the door is easily closed and sealed in normal operation. Power actuated cables move the door, which is roller mounted on tracks of nonconstant curvature, by means of push-pull rods and cam linkages into open and closed position.
Inventors
- 👤 Kenneth Ritchie
- 👤 Leonard Schroedter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 08:52
CPC Classifications
B; B64; B64C; B64C1/00; B64C1/14; B64C1/1407; B64C1/1423; B64C1/1438
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
213 words
An overhead plug door comprising: a door with top and bottom laterally extending rotatable shafts thereon, bellcranks on each of said shafts, said bellcranks on each shaft having arms thereon interconnected with a push-pull rod whereby rotational movement of one bellcrank and shaft causes rotational movement of the other bellcrank and shaft, said bellcranks having other arms with spaced apart rollers thereon, door jamb tracks engageable with said rollers, said tracks having a nonconstant curvature whereby movement of said rollers along said track rotates said bellcranks and said shafts and hence the roller position on said track determines the position of said door relative to said tracks, said rollers on said bellcranks on said top shafts being pivotally connected thereto and said rollers on said bellcranks on said bottom shafts being fixedly mounted thereon, and lifting means secured to said upper rollers at points offset from the plane of said door in the closed position thereof, said upper bellcranks pivoting said door toward an in-line position with said upper rollers when a lifting force is exerted by said lifting means, whereby pivoting of said upper bellcrank causes said fixedly mounted rollers at the bottom of said door to react with said tracks to move the bottom of said door relative to said tracks.
Claim 2
Dependent Claim
213 words
An overhead plug door comprising: a door with top and bottom laterally extending rotatable shafts thereon, bellcranks on each of said shafts, said bellcranks on each shaft having arms thereon interconnected with a push-pull rod whereby rotational movement of one bellcrank and shaft causes rotational movement of the other bellcrank and shaft, said bellcranks having other arms with spaced apart rollers thereon, door jamb tracks engageable with said rollers, said tracks having a nonconstant curvature whereby movement of said rollers along said track rotates said bellcranks and said shafts and hence the roller position on said track determines the position of said door relative to said tracks, said rollers on said bellcranks on said top shafts being pivotally connected thereto and said rollers on said bellcranks on said bottom shafts being fixedly mounted thereon, and lifting means secured to said upper rollers at points offset from the plane of said door in the closed position thereof, said upper bellcranks pivoting said door toward an in-line position with said upper rollers when a lifting force is exerted by said lifting means, whereby pivoting of said upper bellcrank causes said fixedly mounted rollers at the bottom of said door to react with said tracks to move the bottom of said door relative to said tracks.
Claim 3
Dependent Claim
33 words
An overhead plug door as set forth in claim 1 wherein said tracks are curved near the bottoms thereof to move said door into and out of a doorway opening between said tracks.
Claim 4
Dependent Claim
34 words
An overhead plug door as set forth in claim 1 wherein said tracks guide movement of said door between closed position within an opening defined by said door jamb and an open position overhead.
Claim 5
Dependent Claim
93 words
An overhead plug door as set forth in claim 1 wherein a force applied to an arm of one of said bellcranks along said tracks imparts a rotational movement on said bellcrank and associated movement of that portion of said door to which said bellcrank is pivotally mounted, said push-pull rod imparting a similar movement to the other of said bellcranks to move that portion of said door to which said other bellcrank is associated, said push-pull rod responding to movement of said other bellcrank to further rotAte the first of said bellcranks.
Claim 6
Dependent Claim
31 words
An overhead plug door as set forth in claim 1 wherein at least one of said bellcranks has an arm with an integral crossbar with rollers mounted on the ends thereof.
Claim 7
Dependent Claim
27 words
An overhead plug door as set forth in claim 1 wherein at least one of said bellcranks has an arm with a roller support pivotally mounted thereon.
Claim 8
Dependent Claim
30 words
An overhead plug door as set forth in claim 1 wherein at least one of said bellcranks includes a pair of interconnected arms, each of which has rollers mounted thereon.
Claim 9
Dependent Claim
32 words
An overhead plug door as set forth in claim 7 wherein each of said arms has a roller support pivotally mounted thereon with rollers mounted at each end of said roller support.
References Cited (Backward Citations)
US2587863A
Cited
US3440762A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-06-21 | 1974-12-21 | 1975-06-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-21 | 1978-12-21 | 1979-06-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-21 | 1982-12-21 | 1983-06-22 | $7700.00 | Window Closed / Lapsed |