Patent US3920253A successfully refreshed from Google Patents.
US3920253A
Expired / Lapsed
US
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Non-leaking gas spring
Assignee: Individual
•
Filing: 1974-12-02
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Granted: 1975-11-18
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Expires: 1994-12-02
Abstract
Abstract A non-leaking gas spring comprises two grooves in the internal wall of the housing at a preset distance, with a ring in a corresponding annular recess in the guide element and the holding element, with at least the ring associated with the holding element in the form of a snap ring.
Inventors
- 👤 Fritz Bauer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 07:45
CPC Classifications
F; F16; F16J; F16J15/00; F16J15/16; F16J15/32; F16J15/3204; F16J15/3232; F16F; F16F9/00; F16F9/32; F16F9/36; F16F9/362; Y; Y10; Y10S; Y10S277/00; Y10S277/925
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
149 words
In a gas spring comprising a housing made of a slender cylindrical tube; a piston rod mounted coaxially in said housing and protruding out of one end of said housing; a guide piston supported by said piston rod and positioned for axial movement in said housing; a multi-lip annular seal fastened axially in said housing at the end thereof from which said piston rod emerges, said seal resting against the piston rod, the internal end face of said seal having a fastening element and the outer end face having a guide element, the improvement wherein the internal wall of said housing is provided with two grooves at a preset distance, said gas spring further comprising a pair of rings each fitting into a corresponding annular recess in said guide element and in said fastening element, with at least the ring associated with said fastening element being a snap ring.
Claim 2
Dependent Claim
149 words
In a gas spring comprising a housing made of a slender cylindrical tube; a piston rod mounted coaxially in said housing and protruding out of one end of said housing; a guide piston supported by said piston rod and positioned for axial movement in said housing; a multi-lip annular seal fastened axially in said housing at the end thereof from which said piston rod emerges, said seal resting against the piston rod, the internal end face of said seal having a fastening element and the outer end face having a guide element, the improvement wherein the internal wall of said housing is provided with two grooves at a preset distance, said gas spring further comprising a pair of rings each fitting into a corresponding annular recess in said guide element and in said fastening element, with at least the ring associated with said fastening element being a snap ring.
Claim 3
Dependent Claim
25 words
A gas spring according to claim 1, wherein the seal is made of a homogeneous material and presses against the internal wall of the housing.
Claim 4
Dependent Claim
27 words
A gas spring according to claim 1, wherein the groove associated with said guide element is tapered in the direction of the internal chamber of the housing.
Claim 5
Dependent Claim
36 words
A gas spring according to claim 1, wherein said housing is provided, at the end from which the piston rod emerges, with a taper in its internal wall which expands toward the edge of the housing.
Claim 6
Dependent Claim
18 words
A gas spring according to claim 1, wherein the ring associated with guide element is a snap ring.
Claim 7
Dependent Claim
18 words
A gas spring according to claim 1, wherein said guide element overlaps the end edge of said housing.
Claim 8
Dependent Claim
44 words
A gas spring according to claim 1, wherein the recess in said guide element and the corresponding groove extends to the end surface of housing, by the corresponding ring being rigid, and by the outside edge area of housing being flanged over this ring.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-11-17 | 1979-05-19 | 1979-11-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-17 | 1983-05-19 | 1983-11-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-17 | 1987-05-19 | 1987-11-18 | $7700.00 | Window Closed / Lapsed |