US3818637A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for quickly opening, damping, holding open, and closing a hinged closure member
Assignee: Direction Générale de l'Armement
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Filing: 1972-07-12
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Granted: 1974-06-25
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Expires: 1992-07-12
Abstract
Abstract Apparatus for quickly opening, damping, holding open and closing a hinged closure member such as a door, comprising a spring urging a door in an open direction, and a fluid operable jack the piston rod of which is hinged to a variable reduction lever linked to the door, and the jack and lever are connected to damping and locking systems.
Inventors
- 👤 A Vivier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 00:31
CPC Classifications
F; F41; F41F; F41F3/00; F41F3/04; F41F3/077; E; E05; E05Y; E05Y2900/00; E05Y2900/10; E05Y2900/13; E05Y2900/132
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
138 words
Apparatus for quickly opening, damping and holding open a hinged closure member, comprising: a hinged closure member and resilient means urging said closure member in an open direction; a variable reduction lever linked to said closure member; a fluid operable jack having a piston cylinder in which is mounted a movable, solid piston member which divides said cylinder into two chambers for containing fluid, said piston member attached to said variable reduction lever by a piston rod extending from one face of said piston member; a truncated cone-shaped member extending from the other face of Said piston member and cooperating with a passage which extends through a diaphragm located within said cylinder, for regulating fluid flow through said passage; and means for locking said closure member in an open position by trapping fluid within one of said chambers.
Claim 2
Dependent Claim
138 words
Apparatus for quickly opening, damping and holding open a hinged closure member, comprising: a hinged closure member and resilient means urging said closure member in an open direction; a variable reduction lever linked to said closure member; a fluid operable jack having a piston cylinder in which is mounted a movable, solid piston member which divides said cylinder into two chambers for containing fluid, said piston member attached to said variable reduction lever by a piston rod extending from one face of said piston member; a truncated cone-shaped member extending from the other face of Said piston member and cooperating with a passage which extends through a diaphragm located within said cylinder, for regulating fluid flow through said passage; and means for locking said closure member in an open position by trapping fluid within one of said chambers.
Claim 3
Dependent Claim
38 words
The apparatus of claim 1 wherein the piston is moved toward the diaphragm leaving the larger of said chambers on the side of said one face of said piston member when the closure member is in open position.
Claim 4
Dependent Claim
24 words
The apparatus of claim 2 wherein said locking means comprises hydraulic means for trapping at least a portion of fluid in said larger chamber.
Claim 5
Dependent Claim
19 words
The apparatus of claim 3 wherein said hydraulic means comprises a non-return valve controlled by a dual direction hydrovalve.
Claim 6
Dependent Claim
162 words
Apparatus for quickly opening, damping and holding open a hinged closure member, comprising: a hinged closure member and resilient means urging said closure member in an open direction; a variable reduction lever linked to said closure member; a fluid operable jack having a piston cylinder in which is mounted a movable, solid piston member which divides said cylinder into two chambers for contacting fluid, said piston member attached to said variable reduction lever by a piston rod extending from one face of said piston member; a truncated cone-shaped member extending from the other face of said piston member and cooperating with a passage which extends through a diaphragm located within said cylinder, for regulating fluid flow through said passage; a spring loaded, hinged duckbill cooperating with said variable reduction lever for locking said closure member in an open position; and hydraulic means connected to said piston cylinder and associated with said duckbill, for coordinating the operation of said piston and said duckbill.
Claim 7
Dependent Claim
162 words
Apparatus for quickly opening, damping and holding open a hinged closure member, comprising: a hinged closure member and resilient means urging said closure member in an open direction; a variable reduction lever linked to said closure member; a fluid operable jack having a piston cylinder in which is mounted a movable, solid piston member which divides said cylinder into two chambers for contacting fluid, said piston member attached to said variable reduction lever by a piston rod extending from one face of said piston member; a truncated cone-shaped member extending from the other face of said piston member and cooperating with a passage which extends through a diaphragm located within said cylinder, for regulating fluid flow through said passage; a spring loaded, hinged duckbill cooperating with said variable reduction lever for locking said closure member in an open position; and hydraulic means connected to said piston cylinder and associated with said duckbill, for coordinating the operation of said piston and said duckbill.
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) | 1977-06-24 | 1977-12-24 | 1978-06-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-24 | 1981-12-24 | 1982-06-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-24 | 1985-12-24 | 1986-06-25 | $7700.00 | Window Closed / Lapsed |