Patent US20140189239A1 successfully refreshed from Google Patents.
US3854733A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Shaft seal
Assignee: Allen Bradley Co LLC
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Filing: 1972-07-24
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Granted: 1974-12-17
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Expires: 1992-07-24
Abstract
Abstract A seal for a rotary shaft extending through a bushing that has a sleeve in an annular space between the shaft and the bushing, and a flange projecting radially outward from one end of the sleeve that includes a circumferential lip turning back over the sleeve to fit around an edge of the bushing. The sleeve has a plurality of axially spaced, annular sealing ribs projecting radially inward from its inner surface and a plurality of axially spaced, annular pressure ridges projecting radially outward from its exterior surface. The ribs and ridges are in offset axial relation with respect to one another, and the sleeve portion with ribs and ridges is radially compressed when inserted between the bushing and shaft to develop sufficient sealing forces without creation of excessive drag opposing shaft rotation.
Inventors
- 👤 R Wilson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 13:40
CPC Classifications
F; F16; F16J; F16J15/00; F16J15/16; F16J15/32
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
266 words
In a seal for a shaft that extends through an opening of a member which presents an axially extending rim, a length of said shaft being smaller in diameter than said opening to have an annular space for receiving a seal, the combination of: a resilient sleeve that encircles said shaft and is disposed in said annular space so as to be encircled in turn by the wall of said opening; a plurality of axially spaced annular sealing ribs formed integrally on the interior surface of said sleeve to project radially inward and abut the surface of said shaft; a plurality of axially spaced annular pressure ridges formed integrally on the exterior surface of said sleeve that are in an offset axial relation to said sealing ribs, and projecting radially outward from said sleeve to abut against the wall of said opening; said sleeve with said integral sealing ribs and pressure ridges having a radial depth greater than the radial extent of said annular space when removed from said space, so that upon insertion in said space the ribs and ridges fit firmly against said shaft surface and said opening wall respectively with portions of said sleeve between ribs and ridges held in flexed condition; and an integral head portion for said sleeve having an annular flange projecting radially outward from one end of said sleeve, which flange has a circumferential lip extending back to overhang said sleeve to form a niche in the head portion, said niche receiving said rim of said member with a snug fit to seal said rim with said head portion.
Claim 2
Dependent Claim
266 words
In a seal for a shaft that extends through an opening of a member which presents an axially extending rim, a length of said shaft being smaller in diameter than said opening to have an annular space for receiving a seal, the combination of: a resilient sleeve that encircles said shaft and is disposed in said annular space so as to be encircled in turn by the wall of said opening; a plurality of axially spaced annular sealing ribs formed integrally on the interior surface of said sleeve to project radially inward and abut the surface of said shaft; a plurality of axially spaced annular pressure ridges formed integrally on the exterior surface of said sleeve that are in an offset axial relation to said sealing ribs, and projecting radially outward from said sleeve to abut against the wall of said opening; said sleeve with said integral sealing ribs and pressure ridges having a radial depth greater than the radial extent of said annular space when removed from said space, so that upon insertion in said space the ribs and ridges fit firmly against said shaft surface and said opening wall respectively with portions of said sleeve between ribs and ridges held in flexed condition; and an integral head portion for said sleeve having an annular flange projecting radially outward from one end of said sleeve, which flange has a circumferential lip extending back to overhang said sleeve to form a niche in the head portion, said niche receiving said rim of said member with a snug fit to seal said rim with said head portion.
Claim 3
Dependent Claim
42 words
A seal as in claim 1 wherein the flange of said head portion includes a front side facing in an axial direction with an annular groove therein to increase the flexibility of that end of the sleeve from which said flange projects.
Claim 4
Dependent Claim
195 words
In a seal assembly for a rotatable shaft extending through an opening in a bearing, such shaft having a bearing portion journaled in a part of said bearing and an adjacent portion spaced from the wall of the bearing opening to form an annular space, the combination of: a solid, resilient sleeve in said annular space spaced radially from both said shaft and the wall of the opening of said bearing; a plurality of axially spaced, annular, resilient ribs formed on the interior surface of the sleeve to project radially inward, abutting the surface of said shaft; a plurality of axially spaced, annular, resilient ridges formed on the exterior surface of the sleeve in an offset axial relation to said sealing ribs, at least some of said pressure ridges disposed axially between two sealing ribs and having a normal diameter to project outward a radial distance greater than the diameter of said bearing opening to thereby abut the inner surface of said bearing to urge said sleeve and said sealing ribs radially inward; and a head portion on said sleeve presenting a flange extending radially outward in sealing engagement with an end of said bearing.
Claim 5
Dependent Claim
195 words
In a seal assembly for a rotatable shaft extending through an opening in a bearing, such shaft having a bearing portion journaled in a part of said bearing and an adjacent portion spaced from the wall of the bearing opening to form an annular space, the combination of: a solid, resilient sleeve in said annular space spaced radially from both said shaft and the wall of the opening of said bearing; a plurality of axially spaced, annular, resilient ribs formed on the interior surface of the sleeve to project radially inward, abutting the surface of said shaft; a plurality of axially spaced, annular, resilient ridges formed on the exterior surface of the sleeve in an offset axial relation to said sealing ribs, at least some of said pressure ridges disposed axially between two sealing ribs and having a normal diameter to project outward a radial distance greater than the diameter of said bearing opening to thereby abut the inner surface of said bearing to urge said sleeve and said sealing ribs radially inward; and a head portion on said sleeve presenting a flange extending radially outward in sealing engagement with an end of said bearing.
Claim 6
Dependent Claim
252 words
In a seal asseMbly for a rotatable shaft extending through an opening of a bearing, the combination of: a rotatable shaft extending through said opening with a bearing portion journaled in a part of said bearing opening and an adjacent portion spaced from the wall of the opening to form an annular space; and a seal seated in said annular space that circumscribes said shaft and is in turn circumscribed by said bearing, which seal comprises: a resilient sleeve extending axially of the shaft that is spaced radially from both said shaft and the wall of the opening of said bearing; a plurality of axially spaced, annular sealing ribs formed integrally on the interior surface of the sleeve to project radially inward to abut the surface of said shaft; a plurality of axially spaced, annular pressure ridges formed integrally on the exterior surface of the sleeve each in an offset axial relation to said sealing ribs, with the ribs and ridges being spaced alternately along the sleeve, and the ribs and ridges presenting a radial thickness greater than the depth of said annular space to thereby be compressed when inserted in said space to urge said sealing ribs inward against the shaft and said ridges against said bushing, with the sleeve portions extending axially between ribs and ridges being in a state of flex; and an integral head portion having an annular flange projecting radially outward from one end of said sleeve, which flange fits snugly over one end of said bearing.
Claim 7
Dependent Claim
252 words
In a seal asseMbly for a rotatable shaft extending through an opening of a bearing, the combination of: a rotatable shaft extending through said opening with a bearing portion journaled in a part of said bearing opening and an adjacent portion spaced from the wall of the opening to form an annular space; and a seal seated in said annular space that circumscribes said shaft and is in turn circumscribed by said bearing, which seal comprises: a resilient sleeve extending axially of the shaft that is spaced radially from both said shaft and the wall of the opening of said bearing; a plurality of axially spaced, annular sealing ribs formed integrally on the interior surface of the sleeve to project radially inward to abut the surface of said shaft; a plurality of axially spaced, annular pressure ridges formed integrally on the exterior surface of the sleeve each in an offset axial relation to said sealing ribs, with the ribs and ridges being spaced alternately along the sleeve, and the ribs and ridges presenting a radial thickness greater than the depth of said annular space to thereby be compressed when inserted in said space to urge said sealing ribs inward against the shaft and said ridges against said bushing, with the sleeve portions extending axially between ribs and ridges being in a state of flex; and an integral head portion having an annular flange projecting radially outward from one end of said sleeve, which flange fits snugly over one end of said bearing.
Claim 8
Dependent Claim
43 words
A seal as in claim 4 wherein said bearing fits in a housing wall and has an axially extending edge to form a recess with the wall, and said head portion has a lip that fits around the edge and within said recess.
Claim 9
Dependent Claim
33 words
A seal as in claim 5 wherein the top and bottom sides of the lip each have an annular node protruding therefrom so that the lip has a compressed fit in said recess.
References Cited (Backward Citations)
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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) | 1977-12-16 | 1978-06-17 | 1978-12-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-16 | 1982-06-17 | 1982-12-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-16 | 1986-06-17 | 1986-12-17 | $7700.00 | Window Closed / Lapsed |