Patent US3572734A successfully refreshed from Google Patents.
US3572734A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Shaft seal
Assignee: Individual
•
Filing: 1968-09-27
•
Granted: 1971-03-30
•
Expires: 1988-09-27
Abstract
Abstract A shaft seal formed of nylon and having a W-shape in radial cross section with a central hinge portion interconnecting two oppositely disposed V-portions and elastomer bodies filling the cavities formed by the walls of said V-portions.
Inventors
- 👤 John E Holt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 18:37
CPC Classifications
F; F16; F16J; F16J15/00; F16J15/16; F16J15/32; F16J15/3204; F16J15/3208; F16J15/3232; F16J15/3236
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
158 words
A shaft seal construction for use between the peripheral surface of a shaft and a wall opening in which the shaft is positioned wherein it is desirable to prevent leakage along said peripheral surface from one side of the wall to the other and with minimum interference with relative movement between said peripheral surface and the seal, a relatively resilient W-member which is W-shaped in radial cross section with a central hinge portion interconnecting two oppositely disposed V-portions, each of said V-portions comprising two interconnected walls with a cavity therebetween, one of said V-portions having a free edge portion of one wall resting against said peripheral surface of the shaft in sealing relationship, and elastomer bodies filling said cavities and providing fluid pressure resisting the movement of said walls of each of said V-portions toward Each other, whereby said free edge portion is resiliently urged against said peripheral surface by the fluid pressure of the adjacent elastomer body.
Claim 2
Dependent Claim
158 words
A shaft seal construction for use between the peripheral surface of a shaft and a wall opening in which the shaft is positioned wherein it is desirable to prevent leakage along said peripheral surface from one side of the wall to the other and with minimum interference with relative movement between said peripheral surface and the seal, a relatively resilient W-member which is W-shaped in radial cross section with a central hinge portion interconnecting two oppositely disposed V-portions, each of said V-portions comprising two interconnected walls with a cavity therebetween, one of said V-portions having a free edge portion of one wall resting against said peripheral surface of the shaft in sealing relationship, and elastomer bodies filling said cavities and providing fluid pressure resisting the movement of said walls of each of said V-portions toward Each other, whereby said free edge portion is resiliently urged against said peripheral surface by the fluid pressure of the adjacent elastomer body.
Claim 3
Dependent Claim
40 words
A shaft seal construction as described in claim 1 wherein said relatively resilient W-member is formed of a thin wall of nylon and wherein said elastomer bodies are molded in their respective cavities and bonded to the adjacent wall surfaces.
Claim 4
Dependent Claim
63 words
A shaft seal construction as described in claim 2 which is annular and is adapted to nest within a wall cavity which presents a cylindrical outer surface which compresses the outer wall of said relatively resilient W-member radially inwardly, and wherein a shaft having an outer peripheral surface may be positioned within said seal construction and press said free edge portion radially outwardly.
Claim 5
Dependent Claim
40 words
A shaft seal construction as described in claim 1 wherein said relatively resilient W-member is annular and is formed of a polyamide and has an annular cavity between said V-portions, and a body of elastomer substantially filling said annular cavity.
Claim 6
Dependent Claim
14 words
A shaft seal construction as described in claim 4 wherein the polyamide is nylon.
Claim 7
Dependent Claim
55 words
A shaft seal construction as described in claim 1 wherein said relatively resilient W-member is annular and is formed of nylon, and the combination therewith of a wall construction which compresses said shaft seal construction at its outer periphery and a shaft positioned within said wall construction and holding said free edge portion radially outwardly.
Claim 8
Dependent Claim
49 words
A shaft seal construction as described in claim 1 wherein said relatively resilient W-member is annular and is of nylon and has a free edge portion at its outer periphery similar to the first-described edge portion, each of said free edge portions being tapered and providing a feather edge.
Claim 9
Dependent Claim
29 words
A shaft seal construction as described in claim 1 wherein the surface of said free edge portion which contacts said peripheral surface is frustoconical converging toward said free edge.
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) | 1974-03-29 | 1974-09-28 | 1975-03-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-29 | 1978-09-28 | 1979-03-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-29 | 1982-09-28 | 1983-03-30 | $7700.00 | Window Closed / Lapsed |