Patent US3739885A successfully refreshed from Google Patents.
US3739885A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Telescopic position adjusting devices
Assignee: Whitnash PLC
•
Filing: 1971-06-15
•
Granted: 1973-06-19
•
Expires: 1991-06-15
Abstract
Abstract An aircraft seat having an angularly adjustable back and a telescopic position adjusting device arranged to hold the seat back in any position to which it is set. The telescopic position adjusting device comprises a hollow plunger slidable in a closed ended cylinder. A floating piston divides the hollow plunger into two chambers one of which is filled with liquid and communicates with a passage in the closed end of the cylinder via the bore of a tubular stem which projects through an aperture in the plunger end wall. The other chamber is filled with compressed gas. A nonreturn valve controls liquid flow through the passage between the tubular stem bore and the liquid filled annular cylinder space surrounding the tubular stem. The non-return valve is spring closed and may be opened manually by a pin which is housed within the closed end of the cylinder for movement radially of the cylinder. The tubular stem has a radial flange which is engaged by a clip ring mounted in the cylinder and held in abutment with the closed end of the cylinder. The stroke of movement of the plunger can be altered by an adjustable sleeve which provides a stop surface for engagement by the plunger at one end of its stroke.
Inventors
- 👤 W Bainbridge
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 11:29
CPC Classifications
B; B64; B64D; B64D11/00; B64D11/06; B64D11/0639; B64D11/064
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
257 words
A telescopic position adjusting device comprising a cylinder having a closed end and an open end, a hollow plunger with a centrally apertured end wall slidably extending into said cylinder, the other end wall of said plunger being closed and disposed oUtside of said cylinder, a floating piston disposed in said plunger and dividing it into a gas chamber filled with compressed gas adjacent its closed end wall and first liquid chamber adjacent its apertured end wall, a tubular member disposed in said cylinder having one end extending through said apertured end wall and in communication with said liquid chamber, flange means on the other end of said tubular member, clip means abutting said flange means to maintain it abutting said cylinder closed end wall, bore means in said cylinder closed end wall in communication with said tubular member, the inner surface of said cylinder surrounding said tubular member forming a second annular liquid chamber, diametral bore means in said cylinder closed end wall in communication with said bore means, a valve ball seat in said diametral bore means in communication with said bore means, other passage means in the cylinder closed end wall in communication with said annular liquid chamber and said diametral bore means, a non-return ball valve in said diametral bore means adapted to seat on said seat to cut off communication between said first liquid and second liquid chambers, biasing means in said diametral bore means normally maintaining said valve seated, and pin means operatively connected to said ball valve to unseat it.
Claim 2
Dependent Claim
257 words
A telescopic position adjusting device comprising a cylinder having a closed end and an open end, a hollow plunger with a centrally apertured end wall slidably extending into said cylinder, the other end wall of said plunger being closed and disposed oUtside of said cylinder, a floating piston disposed in said plunger and dividing it into a gas chamber filled with compressed gas adjacent its closed end wall and first liquid chamber adjacent its apertured end wall, a tubular member disposed in said cylinder having one end extending through said apertured end wall and in communication with said liquid chamber, flange means on the other end of said tubular member, clip means abutting said flange means to maintain it abutting said cylinder closed end wall, bore means in said cylinder closed end wall in communication with said tubular member, the inner surface of said cylinder surrounding said tubular member forming a second annular liquid chamber, diametral bore means in said cylinder closed end wall in communication with said bore means, a valve ball seat in said diametral bore means in communication with said bore means, other passage means in the cylinder closed end wall in communication with said annular liquid chamber and said diametral bore means, a non-return ball valve in said diametral bore means adapted to seat on said seat to cut off communication between said first liquid and second liquid chambers, biasing means in said diametral bore means normally maintaining said valve seated, and pin means operatively connected to said ball valve to unseat it.
Claim 3
Dependent Claim
18 words
The device of claim 1 wherein said tubular member has stop means limiting outward movement of said plunger.
Claim 4
Dependent Claim
18 words
The device of claim 2 wherein stroke adjusting means are provided for limiting the stroke of said plunger.
Claim 5
Dependent Claim
48 words
The device of claim 3, wherein the stroke adjusting means comprise a sleeve surrounding and having screw-threaded engagement with the cylinder and an annular stop surface on the plunger to co-operate with the end of said sleeve, releasable locking means being provided to hold the sleeve against rotation.
Claim 6
Dependent Claim
73 words
The device of claim 3, wherein the stroke adjusting means comprise a sleeve axially movable with one of the relatively axially movable members constituted by the cylinder and plunger and having a stepped aperture therein, a radial projection on the other of said members extending into said aperture, and means for selectively positioning said sleeve in the rotational sense to align the radial projection with any one of the steps in the aperture.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-06-18 | 1976-12-18 | 1977-06-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-18 | 1980-12-18 | 1981-06-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-18 | 1984-12-18 | 1985-06-19 | $7700.00 | Window Closed / Lapsed |