US4438936A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Secondary sealing element with U-shaped sealing ring for mechanical seals
Assignee: Individual
•
Filing: 1981-02-19
•
Granted: 1984-03-27
•
Expires: 2001-02-19
Abstract
Abstract A secondary sealing element for axial seal rings, is resistant to stresses due to temperature, pressure, vibration, corrosion, swelling and shrinking. This sealing element is produced of non-rubber-type elastic and non brittle material and its shape, in cross-section, consists of a ring, with a pair of arms to give it an elastic reaction. The double-arm ring forms three radial-type sealing surfaces and is completely locked into a chamber. Special material with low static friction and higher thermal conductivity than rubber material is used. Furthermore the dissipation of heat, produced by the axial sliding rings, will be increased through the double contact area to the shaft by the arms in comparison to an O-ring, and through a wear-resistant and non-corrosive layer on the shaft having at least the thermal conductivity of the basic material.
Inventors
- 👤 Rainer Schlegel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 15:37
CPC Classifications
F; F16; F16J; F16J15/00; F16J15/16; F16J15/34; F16J15/38; Y; Y10; Y10S; Y10S277/00; Y10S277/935; Y10S277/936; Y10S277/938
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
142 words
A secondary sealing device for an axial seal ring assembly having a chamber therein with a cylindrical surface wall surrounding the axial shaft, the secondary sealing device comprising: (a) a biased axial sliding and adjustment ring positioned in the chamber; and (b) a sealing ring positioned around the shaft in the chamber between the cylindrical surface wall and sliding and adjustment ring, formed of a material with good sliding, low-elasticity, and non-brittle characteristics, having a generally U-shaped cross-section with two arms extending from a plane perpendicular to the axis of rotation of the shaft, and pressed into sealing engagement against the cylindrical surface wall and the shaft by the axial bias of the sliding and adjustment ring against the side of one of the two arms of the sealing ring and the resulting changes in the diametric dimensions of the sealing ring.
Claim 2
Dependent Claim
142 words
A secondary sealing device for an axial seal ring assembly having a chamber therein with a cylindrical surface wall surrounding the axial shaft, the secondary sealing device comprising: (a) a biased axial sliding and adjustment ring positioned in the chamber; and (b) a sealing ring positioned around the shaft in the chamber between the cylindrical surface wall and sliding and adjustment ring, formed of a material with good sliding, low-elasticity, and non-brittle characteristics, having a generally U-shaped cross-section with two arms extending from a plane perpendicular to the axis of rotation of the shaft, and pressed into sealing engagement against the cylindrical surface wall and the shaft by the axial bias of the sliding and adjustment ring against the side of one of the two arms of the sealing ring and the resulting changes in the diametric dimensions of the sealing ring.
Claim 3
Dependent Claim
15 words
A sealing device according to claim 1, wherein the arms have surface ends formed spherically.
Claim 4
Dependent Claim
26 words
A sealing device according to claim 1 or 2, wherein a spring acts against the adjustment ring to bias and hold in position the sealing ring.
Claim 5
Dependent Claim
25 words
A sealing device according to claim 1 or 2, wherein the arms of the sealing ring form an inner connecting zone of a rounded shape.
Claim 6
Dependent Claim
26 words
A sealing device according to claim 1 or 2, wherein the arms are symmetrical to the plane perpendicular to the axis of rotation of the shaft.
Claim 7
Dependent Claim
16 words
A sealing device according to claim 1 or 2, wherein both arms have a constant thickness.
Claim 8
Dependent Claim
25 words
A sealing element according to claim 1 or 2, wherein both arms have a thickness increasing from the shoulder to the ends of the arms.
Claim 9
Dependent Claim
25 words
A sealing element according to claim 1 or 2, wherein both arms have a thickness decreasing from the shoulder to the ends of the arms.
Claim 10
Dependent Claim
26 words
A sealing element according to claim 1 or 2, wherein the sealing ring has an interior diameter manufactured with minus-tolerance and an outer diameter with plus-tolerance.
Claim 11
Dependent Claim
40 words
A sealing element according to claim 1 or 2, wherein the sealing ring is made of a material selected from the group consisting of PTFE, graphite, carbon, a mixture of PTFE and graphite, or a mixture of PTFE and carbon.
Claim 12
Dependent Claim
40 words
A sealing device according to claim 10, wherein the sealing ring is made of a materiaL selected from the group consisting of a mixture of 0.5 to 50 wt. % glass with PTFE, PTFE and graphite, or PTFE and carbon.
Claim 13
Dependent Claim
26 words
A sealing device according to claim 10, wherein the sealing ring is made of PTFE, mixed with 20 wt. % glass and 5 wt. % graphite.
Claim 14
Dependent Claim
19 words
A sealing device according to claim 10, wherein the sealing ring is made of PTFE mixed with metallic powder.
Claim 15
Dependent Claim
19 words
A sealing device according to claim 1 or 2, wherein the sealing ring is made from a hollow cylinder.
Claim 16
Dependent Claim
26 words
A sealing device according to claim 1 or 2, wherein the sealing ring is made from thin metallic sheets in the form of a hollow profile.
Claim 17
Dependent Claim
32 words
A sealing device according to claim 1 or 2, wherein the sealing ring is made from thin metallic sheets in the form of a hairpin with drop-like thickenings at the arm ends.
Claim 18
Dependent Claim
29 words
A sealing device according to claim 1 or 2, wherein the sealing ring has an outer shape congruent to an O-ring chamber formed by the sliding and adjustment ring.
Claim 19
Dependent Claim
37 words
A sealing device according to claim 1 or 2, wherein both ends of the arms of the sealing ring sealing engage the shaft and form a hollow therebetween for good sealing, heat dissipation and dirt absorption characteristics.
Claim 20
Dependent Claim
40 words
A sealing device according to claim 1 or 2, wherein the arm ends of the sealing ring press against a shaft having a wear and corrosion resistant layer in the surface area of contact between the sealing ring and shaft.
Claim 21
Dependent Claim
25 words
A sealing device according to claim 1 or 2, wherein the arms are directed radially outwardly from the shoulder to the ends of the arms.
References Cited (Backward Citations)
GB503149A
Cited
FR874472A
Cited
CH265615A
Cited
US2729478A
Cited
US2922668A
Cited
FR1131832A
Cited
GB896176A
Cited
GB904256A
Cited
US3117794A
Cited
DE1204475B
Cited
GB1188859A
Cited
CH471338A
Cited
DE1775727A1
Cited
DE2158534A1
Cited
US3897957A
Cited
US3907309A
Cited
US4157187A
Cited
DE2755502A1
Cited
US4361335A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-03-27 | 1987-09-26 | 1988-03-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-03-27 | 1991-09-26 | 1992-03-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-03-27 | 1995-09-26 | 1996-03-27 | $7700.00 | Window Closed / Lapsed |