Patent US3572732A successfully refreshed from Google Patents.
US3572732A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Double load area lip seal
Assignee: Mather Co
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Filing: 1969-02-26
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Granted: 1971-03-30
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Expires: 1989-02-26
Abstract
Abstract A polytetrafluoroethylene elastomeric seal between two relatively movable parallel surfaces, such as for a shaft through a housing, which seal has a substantially uniform bent L-shaped transverse or radial cross section in which the top portion of the vertical leg of the L is fixed substantially perpendicularly to one of the parallel surfaces, such as by a press fit ring in the housing around the shaft, and the lower portion of the vertical leg of the L is bent so as to rest in parallel sliding contact with the other surface and the normally horizontal leg of the L extends substantially perpendicular to this other surface. The thus positioned seal forms a reverse J-shaped cross section bridging the space between the two parallel surfaces. That portion of the lower part of the normally vertical L which has sliding contact with the other surface, seals said surface both statically and dynamically, and is of sufficient width to provide two spaced increased or higher load areas, one adjacent the sharp angle portion of the horizontal leg of the L, and the other adjacent the bend in the vertical leg of the L. In the hook of this J-shaped cross section there may be located a garter spring to insure these two separate higher load areas at the two side edges of the wide contact area of this lip seal. Said other higher load area may also comprise a sharp ridge formed in the outer surface of the L-shaped leg, and/or have adjacent pumping vanes; and the inner surface opposite this ridge may also be provided with a ridge for better seating or pocketing the garter spring. Furthermore, a dust seal may be spaced outside of said other higher load area and attached to the means which anchors the upper portion of the L-shaped leg of the seal or to its housing.
Inventors
- 👤 Stephen A Sekulich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 07:19
CPC Classifications
F; F16; F16J; F16J15/00; F16J15/16; F16J15/32; F16J15/3244; F16J15/3204; F16J15/3208; F16J15/3212
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
217 words
A seal between parts having parallel surfaces moving relative to each other at substantially the same spacing, said seal comprising: a. a substantially uniformly thick elastic polytetrafluoroethylene barrier across the space between the parts, and having a. a cross-sectional area substantially in the shape of a ''''J'''' with a sharp angular outer edge near the end of its hook portion, and in which the vertical leg to said edge is longer than the perpendicular distance between the parallel surfaces; b. the bottom portion of said J rests on one of said surfaces so that the end of said hook portion of said J is substantially perpendicular to and extending away from said one surface; and c. a sufficient portion of the outside of said bottom portion of said J contacts said one surface to produce two spaced parallel load areas at its edges; 1. one load area being a relatively sharp load area at the angle of said hook portion of said J; and 2. the other load area being adjacent and near the lower end of the vertical leg of said J; and B. means for anchoring the upper portion of said vertical leg of said J to the other of said surfaces to move therewith and prevent any leakage between said barrier and said surface.
Claim 2
Dependent Claim
217 words
A seal between parts having parallel surfaces moving relative to each other at substantially the same spacing, said seal comprising: a. a substantially uniformly thick elastic polytetrafluoroethylene barrier across the space between the parts, and having a. a cross-sectional area substantially in the shape of a ''''J'''' with a sharp angular outer edge near the end of its hook portion, and in which the vertical leg to said edge is longer than the perpendicular distance between the parallel surfaces; b. the bottom portion of said J rests on one of said surfaces so that the end of said hook portion of said J is substantially perpendicular to and extending away from said one surface; and c. a sufficient portion of the outside of said bottom portion of said J contacts said one surface to produce two spaced parallel load areas at its edges; 1. one load area being a relatively sharp load area at the angle of said hook portion of said J; and 2. the other load area being adjacent and near the lower end of the vertical leg of said J; and B. means for anchoring the upper portion of said vertical leg of said J to the other of said surfaces to move therewith and prevent any leakage between said barrier and said surface.
Claim 3
Dependent Claim
52 words
the other load area being adjacent and near the lower end of the vertical leg of said J; and B. means for anchoring the upper portion of said vertical leg of said J to the other of said surfaces to move therewith and prevent any leakage between said barrier and said surface.
Claim 4
Dependent Claim
52 words
the other load area being adjacent and near the lower end of the vertical leg of said J; and B. means for anchoring the upper portion of said vertical leg of said J to the other of said surfaces to move therewith and prevent any leakage between said barrier and said surface.
Claim 5
Dependent Claim
22 words
A seal according to claim 1 wherein said parts comprise a housing and a shaft, and wherein said barrier comprises an annulus.
Claim 6
Dependent Claim
25 words
A seal according to claim 1 wherein the upper portion of aid vertical leg of said J is substantially perpendicular to one of said surfaces.
Claim 7
Dependent Claim
28 words
A seal according to claim 1 including a garter the inside in the hook portion of said J to aid the formation of the two spaced load areas.
Claim 8
Dependent Claim
24 words
A seal according to claim 4 including a ridge on inside of the hook portion of said J to further seat said garter spring.
Claim 9
Dependent Claim
29 words
A seal according to claim 1 wherein helical vanes are provided in the surface of said barrier adjacent said other load area and away from said one ad area.
Claim 10
Dependent Claim
43 words
A seal according to claim 1 wherein said means for anchoring the upper portion of said vertical leg of said J comprises a pair of telescopic annular cup members between which said upper end of said vertical leg of said J is clamped.
Claim 11
Dependent Claim
24 words
A seal according to claim 7 including a gasket between said cup members with said upper end of the vertical leg of said J.
Claim 12
Dependent Claim
38 words
A seal a according to claim 1 wherein aid means or anchoring said upper end of the vertical leg of said J includes a plastic directly bonded to said upper end of said vertical leg of said J.
Claim 13
Dependent Claim
52 words
a seal according to claim 1 wherein said means for anchoring the upper portion of the vertical leg of said J also includes means for anchoring a resilient dust seal which contacts said upper portion of said J and is spaced from said other load area away from said one load area.
Claim 14
Dependent Claim
153 words
A static dynamic lip seal for a smooth shaft comprising; A. a annular housing spaced around the shaft; B. a polytetrafluoroethylene elastomeric annulus of substantially uniform thickness having a bent L-shaped radial cross section with a. the upper end of the longer leg of the L attached to said housing, b. the lower end of the longer leg of the L being bent for contacting the cylindrical surface of said shaft, and c. the normal shorter leg portion of the L forming a sharp angle substantially perpendicular to the surface of the shaft, to produce two parallel spaced load areas adjacent the edges of the area of contact with the cylindrical surface of the shaft by the lower portion of the longer leg of the L, one of which load areas is under the angle of the L and the other of said load areas is adjacent the bent portion of the L.
Claim 15
Dependent Claim
153 words
A static dynamic lip seal for a smooth shaft comprising; A. a annular housing spaced around the shaft; B. a polytetrafluoroethylene elastomeric annulus of substantially uniform thickness having a bent L-shaped radial cross section with a. the upper end of the longer leg of the L attached to said housing, b. the lower end of the longer leg of the L being bent for contacting the cylindrical surface of said shaft, and c. the normal shorter leg portion of the L forming a sharp angle substantially perpendicular to the surface of the shaft, to produce two parallel spaced load areas adjacent the edges of the area of contact with the cylindrical surface of the shaft by the lower portion of the longer leg of the L, one of which load areas is under the angle of the L and the other of said load areas is adjacent the bent portion of the L.
Claim 16
Dependent Claim
38 words
A lip seal according to claim 11 including garter spring in the trough formed by the bent-up horizontal end portion of the L and the bent portion of the L to aid the formation of said load areas.
Claim 17
Dependent Claim
24 words
A lip seal according to claim 11 including helical vanes in the outside bent curved portion of the L adjacent said other load area.
Claim 18
Dependent Claim
158 words
A static and dynamic lip seal for a smooth shaft comprising: A. an annular housing spaced around the shaft, B. an elastic tetrafluoroethylene annulus of substantially uniform thickness and of a J shaped radial cross section with a. the outer portion of the vertical leg of said J extending radially of the shaft and being fixed to said housing, b. the bottom of the hook portion of said J extending axially of and in contact with the periphery of the shaft along a shaft along a cylindrical area of the shaft, and c. the outer end of said hook portion extending radially outwardly from the shaft at a sharp angle substantially perpendicular to the surface of the shaft, and C. a garter spring located in said hook portion to form a primary cylindricaL load area at said angle edge of said annulus, and a secondary parallel spaced cylindrical load area near the vertical leg portion of said J.
Claim 19
Dependent Claim
158 words
A static and dynamic lip seal for a smooth shaft comprising: A. an annular housing spaced around the shaft, B. an elastic tetrafluoroethylene annulus of substantially uniform thickness and of a J shaped radial cross section with a. the outer portion of the vertical leg of said J extending radially of the shaft and being fixed to said housing, b. the bottom of the hook portion of said J extending axially of and in contact with the periphery of the shaft along a shaft along a cylindrical area of the shaft, and c. the outer end of said hook portion extending radially outwardly from the shaft at a sharp angle substantially perpendicular to the surface of the shaft, and C. a garter spring located in said hook portion to form a primary cylindricaL load area at said angle edge of said annulus, and a secondary parallel spaced cylindrical load area near the vertical leg portion of said J.
Claim 20
Dependent Claim
15 words
A lip seal according to claim 14 wherein said housing comprises a plastic molded housing.
Claim 21
Dependent Claim
34 words
A lip seal according to claim 14 wherein said housing comprises a pair of telescopic rings of L-shaped radial cross section clamping the said outer portion of the longer leg of said tetrafluoroethylene annulus.
Claim 22
Dependent Claim
16 words
A seal according to claim 16 including a gasket clamped between said rings with said annulus.
Claim 23
Dependent Claim
22 words
A lip seal according to claim 14 including a radial dust seal of rubber attached to said housing and contacting the shaft.
References Cited (Backward Citations)
US3084944A
Cited
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 |