Patent US3927871A successfully refreshed from Google Patents.
US3927871A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cover plate for cylinders having sealed piston rod guides
Assignee: ThyssenKrupp Bilstein GmbH
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Filing: 1974-10-04
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Granted: 1975-12-23
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Expires: 1994-10-04
Abstract
Abstract A cover plate assembly particularly adapted for use in hydropneumatic shock absorbers in which a piston reciprocally moves in a cylinder containing, pressurized gas and a damping liquid is provided. The assembly comprises a high-temperature resisting plastic disc supported on an inwardly disposed annular projection formed on the cylinder wall which projection is disposed adjacent the cylinder end traversed by a pistonactuating rod. A sealing element engaging the piston rod is nestably received in the plastic ring. An overlying metal disc is also traversed by the piston rod, reinforces the plastic disc against bending and serves as a piston rod guide. The metal disc may also be nestably received in a central bore portion of the contiguous plastic disc. The adjacent cylinder end is rolled over the metal disc to clamp the cover elements against the underlying annular projection. A deformable sealing ring engaged by the metal ring and plastic disc is deformed into sealing relation with the cylinder end as such end is deformed and rolled over the metal disc.
Inventors
- 👤 Baan Johannes J De
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 22:21
CPC Classifications
F; F16; F16F; F16F9/00; F16F9/32; F16F9/36; F16F9/362; F16J; F16J15/00; F16J15/16; F16J15/32; F16J15/3204
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
273 words
In a cover plate assembly particularly adapted for use in a hydropneumatic shock absorber, the combination comprising a cylinder having a reciprocally movable piston rod extending therefrom in fluid sealing relation and having an inwardly projecting support disposed on an inner peripheral wall portion; an inner temperature-resistant plastic disc supported on such support in said cylinder; a sealing element traversed by said piston rod and received in a central bore portion in said inner disc; an outer metal disc contiguous with a face portion of said inner disc and a face of said sealing element adapted to guide said piston rod and reinforce said plastic disc against bending forces in the normal course of piston rod movement; an outer, deformable annular sealing ring concentric with said piston rod and metal disc and supportingly disposed on an annular portion of said inner plastic disc; said supporting annular portion of said inner plastic disc initially being of lesser area than the surface of the outer annular sealing ring supported thereon; an inwardly projecting edge portion of said cylinder overlying peripheral portions of said metal disc; said outer sealing ring being urged by said cylinder edge portion against the outer periphery of said outer metal disc and the supporting annular portion of said inner plastic disc so as to be deformed and fill the annular volume defined by said inner plastic disc, said outer metal disc and the inwardly projecting cylinder edge portion; the interval between said inwardly projecting edge portion and said cylinder projecting support being such that said metal disc, sealing ring and inner plastic disc are urged into a closepacked, substantially fluid-tight relation.
Claim 2
Dependent Claim
273 words
In a cover plate assembly particularly adapted for use in a hydropneumatic shock absorber, the combination comprising a cylinder having a reciprocally movable piston rod extending therefrom in fluid sealing relation and having an inwardly projecting support disposed on an inner peripheral wall portion; an inner temperature-resistant plastic disc supported on such support in said cylinder; a sealing element traversed by said piston rod and received in a central bore portion in said inner disc; an outer metal disc contiguous with a face portion of said inner disc and a face of said sealing element adapted to guide said piston rod and reinforce said plastic disc against bending forces in the normal course of piston rod movement; an outer, deformable annular sealing ring concentric with said piston rod and metal disc and supportingly disposed on an annular portion of said inner plastic disc; said supporting annular portion of said inner plastic disc initially being of lesser area than the surface of the outer annular sealing ring supported thereon; an inwardly projecting edge portion of said cylinder overlying peripheral portions of said metal disc; said outer sealing ring being urged by said cylinder edge portion against the outer periphery of said outer metal disc and the supporting annular portion of said inner plastic disc so as to be deformed and fill the annular volume defined by said inner plastic disc, said outer metal disc and the inwardly projecting cylinder edge portion; the interval between said inwardly projecting edge portion and said cylinder projecting support being such that said metal disc, sealing ring and inner plastic disc are urged into a closepacked, substantially fluid-tight relation.
Claim 3
Dependent Claim
55 words
The cover plate assembly as defined in claim 1 in which the plastic disc has three concentric bores, an innermost bore of smallest diameter receiving the piston traversing said plastic disc, the bore of intermediate diameter receiving said sealing element and the bore of the largest diameter receiving said outer metal disc in interfitting relation.
Claim 4
Dependent Claim
22 words
The cover plate assembly of claim 1 in which said inner plastic disc is of synthetic plastic compoSition resistant to high temperatures.
Claim 5
Dependent Claim
30 words
The cover plate assembly of claim 1 in which the central bore of said plastic disc has an inwardly projecting annular flange portion on which said sealing element is seated.
Claim 6
Dependent Claim
54 words
The cover plate assembly of claim 1 in which said sealing element is substantially U-shaped in transverse radial section, the outer sealing element U-side abutting the wall portion of said plastic disc defining said central bore, the inner sealing element U-side abutting the piston rod traversing the same and functioning as a packing washer.
Claim 7
Dependent Claim
43 words
The cover plate assembly of claim 5 in which the outer U-side of the sealing element has an inwardly disposed protuberance which in the compressed state of the sealing element presses against the inner U-side of said sealing element like a packing washer.
Claim 8
Dependent Claim
43 words
The cover plate assembly as defined in claim 1 in which said outer metal disc is embedded in the plastic disc which is thicker, and the metal disc peripheral edge portion projecting from the plastic disc is surrounded by the outer sealing ring.
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) | 1978-12-22 | 1979-06-23 | 1979-12-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-22 | 1983-06-23 | 1983-12-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-22 | 1987-06-23 | 1987-12-23 | $7700.00 | Window Closed / Lapsed |