US3578345A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mechanical seal inserts
Assignee: Individual
•
Filing: 1969-02-03
•
Granted: 1971-05-11
•
Expires: 1989-02-03
Abstract
Abstract Split critically tapered inserts adapted for relatively rotatable in radial face-to-face contact to form a sealing surface when one is carried in a stationary member as the hub part of a frame, and the other carried by a holder on the shaft. Special critically dimensioned grooves convey pressurized fluid to the inserts which act through the effective radial component of area thus provided, easily to eject the inserts. The inserts have contact rings of specially hardened, more expensive material bonded therein to be ground and lapped for final finish contact in rotation.
Inventors
- 👤 John C Copes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 22:15
CPC Classifications
F; F16; F16J; F16J15/00; F16J15/16; F16J15/34; F16J15/3464; F16J15/3488; F16J15/3496
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
104 words
The combination of a seal ring rotatable with a shaft and having a flange extending radially inwardly toward said shaft and a surface extending substantially longitudinally and tapered outwardly from said flange, a split insert tapered to be pressfitted into said seal ring tapered surface and to fit around said shaft, and an annular groove provided in said seal ring tapered surface to communicate substantially centrally of said insert tapered surface and of cross-sectional dimension to provide an effective radially extending annular area in direction of unseating thrust, and of radial width equal to groove width times the tangent of the angle of taper.
Claim 2
Dependent Claim
104 words
The combination of a seal ring rotatable with a shaft and having a flange extending radially inwardly toward said shaft and a surface extending substantially longitudinally and tapered outwardly from said flange, a split insert tapered to be pressfitted into said seal ring tapered surface and to fit around said shaft, and an annular groove provided in said seal ring tapered surface to communicate substantially centrally of said insert tapered surface and of cross-sectional dimension to provide an effective radially extending annular area in direction of unseating thrust, and of radial width equal to groove width times the tangent of the angle of taper.
Claim 3
Dependent Claim
35 words
The combination as claimed in claim 1 in which said radial annulus is an area between 0.005 and 0.02 in ratio to the total frictional surface contact area between the insert and the seal ring.
Claim 4
Dependent Claim
32 words
The combination as claimed in claim 1 in which said radially extending annular area is substantially 1 percent of the total frictional surface contact area between the insert and the seal ring.
Claim 5
Dependent Claim
24 words
The combination as claimed in claim 1 in which the split in said insert is irregular along opposed, generally longitudinally extending lines of cleavage.
Claim 6
Dependent Claim
28 words
The combination as claimed in claim 1, in which said split insert includes a split ring of specially hardened material bonded in the larger diameter end face thereof.
Claim 7
Dependent Claim
17 words
The combination as claimed in claim 1, in which said split ring is comprised of tungsten carbide.
Claim 8
Dependent Claim
90 words
The combination of a stationary insert retainer with a shaft rotatable therein, said retainer including a countersunk and to provide a tapered surface to receive a split insert tapered to be press-fitted thereinto to fit around said shaft, and an annular groove provided in said stationary insert retainer tapered surface substantially centrally of said insert tapered surface and of cross-sectional dimension to provide an effective radially extending annular area in direction of unseating thrust, and of radial width equal to groove width times the tangent of the angle of taper.
Claim 9
Dependent Claim
90 words
The combination of a stationary insert retainer with a shaft rotatable therein, said retainer including a countersunk and to provide a tapered surface to receive a split insert tapered to be press-fitted thereinto to fit around said shaft, and an annular groove provided in said stationary insert retainer tapered surface substantially centrally of said insert tapered surface and of cross-sectional dimension to provide an effective radially extending annular area in direction of unseating thrust, and of radial width equal to groove width times the tangent of the angle of taper.
Claim 10
Dependent Claim
35 words
The combination as claimed in claim 7 in which said radially extending annular area is between 0.005 and 0.02 in ratio to the total frictional surface contact area between the insert and the seal ring.
Claim 11
Dependent Claim
32 words
The combination as claimed in claim 7, in which said radially extending annular area is substantially 1 percent of the total frictional surface contact area between the insert and the seal ring.
Claim 12
Dependent Claim
26 words
The combination as claimed in claim 7 in which the tapered surface and shorter radial surface of said split insert are lined with a resilient material.
Claim 13
Dependent Claim
24 words
The combination as claimed in claim 7 in which the split in said insert is irregular along opposed, generally longitudinally extending lines of cleavage.
Claim 14
Dependent Claim
28 words
The combination as claimed in claim 7, in which said split insert includes a split ring or specially hardened material bonded in the larger diameter end face thereof.
Claim 15
Dependent Claim
17 words
The combination as claimed in claim 7 in which said split ring is comprised of tungsten carbide.
Claim 16
Dependent Claim
88 words
The combination of a holder with a shaft rotatable therein, said holder including a countersunk end to provide a tapered surface to receive a split insert tapered to be press-fitted thereinto to fit around said shaft, and an annular groove provided in said stationary insert holder tapered surface substantially centrally of said insert tapered surface and of cross-sectional dimension to provide an effective radially extending annular area in direction of unseating thrust, and of radial width equal to groove width times the tangent of the angle of taper.
Claim 17
Dependent Claim
88 words
The combination of a holder with a shaft rotatable therein, said holder including a countersunk end to provide a tapered surface to receive a split insert tapered to be press-fitted thereinto to fit around said shaft, and an annular groove provided in said stationary insert holder tapered surface substantially centrally of said insert tapered surface and of cross-sectional dimension to provide an effective radially extending annular area in direction of unseating thrust, and of radial width equal to groove width times the tangent of the angle of taper.
Claim 18
Dependent Claim
28 words
The combination as claimed in claim 14, in which said split insert includes a split ring of specially hardened material bonded in the larger diameter end face thereof.
Claim 19
Dependent Claim
16 words
The combination as claimed in claim 14 in which said split-ring is comprised of tungsten carbide.
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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) | 1974-05-10 | 1974-11-09 | 1975-05-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-10 | 1978-11-09 | 1979-05-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-10 | 1982-11-09 | 1983-05-11 | $7700.00 | Window Closed / Lapsed |