Patent US3765689A successfully refreshed from Google Patents.
US3765689A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mechanical seal construction
Assignee: Durametallic Corp
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Filing: 1971-09-27
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Granted: 1973-10-16
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Expires: 1991-09-27
Abstract
Abstract A mechanical seal construction having an annular face ring, preferably of such a material as tungsten carbide, interferencefitted within an annular flange formed on a seal ring. One of the face ring and seal ring is undercut so that the effective holding force between the flange and the face ring, as created by the interference-fit, acts effectively only at, or at least adjacent, the central transverse plane of the face ring to substantially prevent distortion of the face ring.
Inventors
- 👤 W Adams
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 14:03
CPC Classifications
F; F16; F16J; F16J15/00; F16J15/16; F16J15/34; F16J15/3464; F16J15/3468; F16J15/38; Y; Y10; Y10S; Y10S277/00; Y10S277/93
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
348 words
In a mechanical seal construction for sealing a shaft which is relatively rotatable with respect to a wall, said seal construction having first and second annular elements surrounding said shaft and having opposed transverse seal faces, said first element being secured to said wall and said second element being nonrotatably mounted relative to said shaft, one of said annular elements including a seal ring and a face ring nonrotatably connected to the seal ring, said face ring having one of said transverse seal faces thereon, and means for urging the seal faces into sealing and rotatable sliDing engagement with each other, the improvement comprising: holding means coacting between the seal ring and the face ring for creating an interference-fit therebetween for fixedly connecting said face ring to said seal ring, said holding means imposing a holding force on said face ring directed substantially radially inwardly relative to the face ring and effectively acting only at least adjacent the central transverse plane of the face ring so as to not impose any substantial twisting moment on the face ring to thus minimize distortion of the face ring; said holding means including an annular axially extending flange fixedly and integrally connected to said seal ring and projecting from one end thereof and defining a substantially annular recess, said face ring being disposed within said recess with one axial end of said face ring being abutted against said seal ring and the other axial end of said face ring having said one seal face formed thereon, said flange creating an interference-fit with the annular peripheral surface of said face ring; and one of said face ring and flange having an annular groove formed therein adjacent said one end of said face ring so that the annular peripheral surface of said face ring adjacent said one end thereof is spaced from and maintained out of contact with said annular flange, said annular flange contacting and imposing a holding force on the annular peripheral surface of said face ring only at a location spaced axially from said one end of said face ring.
Claim 2
Dependent Claim
348 words
In a mechanical seal construction for sealing a shaft which is relatively rotatable with respect to a wall, said seal construction having first and second annular elements surrounding said shaft and having opposed transverse seal faces, said first element being secured to said wall and said second element being nonrotatably mounted relative to said shaft, one of said annular elements including a seal ring and a face ring nonrotatably connected to the seal ring, said face ring having one of said transverse seal faces thereon, and means for urging the seal faces into sealing and rotatable sliDing engagement with each other, the improvement comprising: holding means coacting between the seal ring and the face ring for creating an interference-fit therebetween for fixedly connecting said face ring to said seal ring, said holding means imposing a holding force on said face ring directed substantially radially inwardly relative to the face ring and effectively acting only at least adjacent the central transverse plane of the face ring so as to not impose any substantial twisting moment on the face ring to thus minimize distortion of the face ring; said holding means including an annular axially extending flange fixedly and integrally connected to said seal ring and projecting from one end thereof and defining a substantially annular recess, said face ring being disposed within said recess with one axial end of said face ring being abutted against said seal ring and the other axial end of said face ring having said one seal face formed thereon, said flange creating an interference-fit with the annular peripheral surface of said face ring; and one of said face ring and flange having an annular groove formed therein adjacent said one end of said face ring so that the annular peripheral surface of said face ring adjacent said one end thereof is spaced from and maintained out of contact with said annular flange, said annular flange contacting and imposing a holding force on the annular peripheral surface of said face ring only at a location spaced axially from said one end of said face ring.
Claim 3
Dependent Claim
38 words
A seal construction according to claim 1, wherein said flange contacts said face ring at least adjacent a transverse plane disposed substantially midway between the planes defined by the front and rear axial surfaces of the face ring.
Claim 4
Dependent Claim
52 words
A seal construction according to claim 1, wherein said annular flange has an undercut annular groove formed in the inner periphery thereof adjacent the axially rearward end of the flange so that said undercut groove surrounds a portion of the annular periphery of said face ring adjacent said one axial end thereof.
Claim 5
Dependent Claim
31 words
A seal construction according to claim 3, wherein said undercut groove has an axial width between about 40 percent and about 60 percent of the axial width of said face ring.
Claim 6
Dependent Claim
55 words
A seal construction according to claim 3, wherein said flange is substantially L-shaped in cross section and has a radially inwardly directed annular rib disposed adjacent the free end thereof, said rib being disposed in snug engagement with the outer periphery of said face ring for fixedly connecting said face ring to said seal ring.
Claim 7
Dependent Claim
92 words
A seal construction according to claim 1, wherein said face ring has a maximum normal outer diameter greater than the minimum normal internal diameter of said annular flange to thus create an interference-fit therebetween when the face ring is fixed into the recess defined by said flange, said flange contacting said face ring only within a narrow annular ring-like area disposed substantially to include the central transverse plane of said face ring due to said flange being angularly deflected when said face ring is positioned within the recess defined by said flange.
Claim 8
Dependent Claim
27 words
A seal construction according to claim 6, wherein said face ring and said seal ring are constructed from different materials having substantially different coefficients of thermal expansion.
Claim 9
Dependent Claim
22 words
A seal construction according to claim 1, wherein said annular groove is formed on said face ring adjacent said one end thereof.
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) | 1976-10-15 | 1977-04-16 | 1977-10-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-15 | 1981-04-16 | 1981-10-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-15 | 1985-04-16 | 1985-10-16 | $7700.00 | Window Closed / Lapsed |