US3750855A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydro-pneumatic piston and cylinder damping device
Assignee: Individual
•
Filing: 1971-12-02
•
Granted: 1973-08-07
•
Expires: 1991-12-02
Abstract
Abstract A piston and cylinder damping device wherein the cylinder is provided with a compensating chamber for the fluid displaced by the piston rod, wherein the compensating chamber takes the form of a cartridge which contains a pressurised gas and which has at one end a sealing disc, the device being also provided with a punch which is arranged to pierce the sealing disc when in use the cartridge is assembled to the cylinder and the piston is first displaced by relative inward movement of the associated piston rod, piercing of the sealing disc then enabling the pressurised gas in the cartridge to be placed in communication with the fluid in the cylinder.
Inventors
- 👤 C Peddinghaus
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 14:21
CPC Classifications
F; F16; F16F; F16F9/00; F16F9/06; F16F9/064
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
140 words
A piston and cylinder damping device in which a damping piston secured on a piston rod can be displaced in a cylinder containing damping fluid so as to divide said cylinder into two chambers of varying volume, and wherein the cylinder is provided with a compensating chamber for the fluid displaced by the piston rod, said compensating chamber containing pressurised gas, and being disposed in that end of the cylinder opposite to that through which the piston rod extends, characterised in that the compensating chamber is formed as a cartridge which has at one end a sealing disc, and in that there is provided in said device adjacent to the sealing disc a punch which is arranged to pierce said sealing disc when said piston is first displaced relatively to the cylinder by relative inward movement of said piston rod.
Claim 2
Dependent Claim
140 words
A piston and cylinder damping device in which a damping piston secured on a piston rod can be displaced in a cylinder containing damping fluid so as to divide said cylinder into two chambers of varying volume, and wherein the cylinder is provided with a compensating chamber for the fluid displaced by the piston rod, said compensating chamber containing pressurised gas, and being disposed in that end of the cylinder opposite to that through which the piston rod extends, characterised in that the compensating chamber is formed as a cartridge which has at one end a sealing disc, and in that there is provided in said device adjacent to the sealing disc a punch which is arranged to pierce said sealing disc when said piston is first displaced relatively to the cylinder by relative inward movement of said piston rod.
Claim 3
Dependent Claim
17 words
A damping device as claimed in claim 1, characterised in that the cartridge also contains damping fluid.
Claim 4
Dependent Claim
29 words
A damping device as claimed in claim 1, characterised in that said sealing disc of said cartridge has radial stiffening ribs as well as a centrally disposed piercing area.
Claim 5
Dependent Claim
26 words
A damping device as claimed in claim 1, characterised in that said sealing disc of the cartridge is axially located between a seal and a circlip.
Claim 6
Dependent Claim
26 words
A damping device as claimed in claim 1, characterised in that the end of the piston rod disposed within the cylinder is provided with said punch.
Claim 7
Dependent Claim
27 words
A damping device as claimed in claim 1, characterised in that the cartridge has an external diameter which is smaller than the internal diameter of said cylinder.
Claim 8
Dependent Claim
29 words
A damping device as claimed in claim 6, characterised in that said punch is provided on the interior surface of that end of said cylinder adjacent to said cartridge.
Claim 9
Dependent Claim
21 words
A damping device as claimed in claim 2, characterised in that said cartridge is provided internally with an axially movable piston.
Claim 10
Dependent Claim
35 words
A damping device as claimed in claim 8 characterised in that said cartridge is also provided internally with a valve plate having valves for controlling the flow of fluid into and out of the cartridge.
Claim 11
Dependent Claim
43 words
A damping device as claimed in claim 1, characterised in that said cartridge has a larger external diameter than the external diameter of said cylinder and is provided with a counter-bore whereby the cartridge can be fitted over one end of said cylinder.
Claim 12
Dependent Claim
19 words
A damping device as claimed in claim 10, characterised in that the cartridge is welded to the cylinder wall.
References Cited (Backward Citations)
US3272495A
Cited
US3486590A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-08-06 | 1977-02-05 | 1977-08-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-06 | 1981-02-05 | 1981-08-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-06 | 1985-02-05 | 1985-08-07 | $7700.00 | Window Closed / Lapsed |