US3712429A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cylinder and piston arrangement
Assignee: Suspa Federungstechnik GmbH
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Filing: 1971-03-12
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Granted: 1973-01-23
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Expires: 1991-03-12
Abstract
Abstract A piston and cylinder arrangement, more particularly for the stepless adjustment of table flaps, chair backs etc., comprises a cylinder containing a pressure medium, more particularly a gas under pressure. In the cylinder a piston rod with a piston fixed to it is arranged to slide. The piston is provided with an annular seal bearing against the cylinder bore and is bypassed by means of a connecting duct in the piston. The two outlet openings of the duct arranged on the two sides of the annular seal are completely closed by respective separate valves, which can be opened by means which is operated externally. The valve seats are formed in a sleeve of flexible material.
Inventors
- 👤 G Otto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 19:12
CPC Classifications
A; A47; A47C; A47C3/00; A47C3/20; A47C3/30; Y; Y10; Y10T; Y10T137/00; Y10T137/8593; Y10T137/87917; Y10T137/87981
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
175 words
A piston and cylinder device for the stepless adjustment of relatively movable parts and for locking them in any desired position, comprising a cylinder containing at least one pressurized fluid; a piston rod, mounted axially displaceably within said cylinder and connected to a piston having an annular seal bearing against the inner wall of said cylinder, the piston having at least one continuous connecting channel bypassing said annular seal including a plurality of outlet orifices; blocking means for said channel comprising a plurality of valve means each having an elastic spring element to urge it from the outside against the seat of its associated outlet orifice, each said seat being made of a flexible and elastic material formed by an annular surface surrounding a passage opening in a sleeve of flexible and elastic material which is aligned with the outlet orifice, so that said outlet orifices of said connecting channel are completely closed on both sides of said annular seal; and means for opening said blocking means and the flow cross-section of said outlet orifices.
Claim 2
Dependent Claim
175 words
A piston and cylinder device for the stepless adjustment of relatively movable parts and for locking them in any desired position, comprising a cylinder containing at least one pressurized fluid; a piston rod, mounted axially displaceably within said cylinder and connected to a piston having an annular seal bearing against the inner wall of said cylinder, the piston having at least one continuous connecting channel bypassing said annular seal including a plurality of outlet orifices; blocking means for said channel comprising a plurality of valve means each having an elastic spring element to urge it from the outside against the seat of its associated outlet orifice, each said seat being made of a flexible and elastic material formed by an annular surface surrounding a passage opening in a sleeve of flexible and elastic material which is aligned with the outlet orifice, so that said outlet orifices of said connecting channel are completely closed on both sides of said annular seal; and means for opening said blocking means and the flow cross-section of said outlet orifices.
Claim 3
Dependent Claim
39 words
A piston and cylinder device in accordance with claim 1 in which the outlet orifice and passage openings have a circular cross-section with the diameter of the passage openings being somewhat less than that of the associated outlet orifices.
Claim 4
Dependent Claim
62 words
A piston and cylinder device in accordance with claim 1 including a support sleeve of a non-resilient material, which lies against the interior of the sleeve of flexible and elastic material and supports the latter, the support sleeve having passage openings which are aligned with the passage openings in the sleeve of flexible and elastic material and have approximately the same diameter.
Claim 5
Dependent Claim
24 words
A piston and cylinder device in accordance with claim 3 comprising sealing means between the support sleeve and the wall of the connecting channel.
Claim 6
Dependent Claim
50 words
A piston and cylinder device in accordance with claim 1 in which the piston consists of a substantially hollow cylindrical or tubular molding whose interior space forms part of the connecting channel, the interior space of the piston being closed off and sealed off at both ends by seal means.
Claim 7
Dependent Claim
17 words
A piston and cylinder device in accordance with claim 1 in which the fluid is a gas.
Claim 8
Dependent Claim
20 words
A piston and cylinder device in accordance with claim 1 in which the fluid comprises a gas and a liquid.
References Cited (Backward Citations)
US1331720A
Cited
US3563349A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-01-23 | 1976-07-24 | 1977-01-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-23 | 1980-07-24 | 1981-01-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-23 | 1984-07-24 | 1985-01-23 | $7700.00 | Window Closed / Lapsed |