Patent US4548849A successfully refreshed from Google Patents.
US4548849A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sealing strips of rows of polypropylene fibers and rows of polytetrafluoroethylene fibers
Assignee: Linear Ltd
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Filing: 1983-06-20
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Granted: 1985-10-22
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Expires: 2003-06-20
Abstract
Abstract A sealing strip comprises a base and pile formed on the base. The strip is sandwiched between two surfaces to form a seal between the surfaces with the base being mounted on one surface and the pile being compressed by the other surface. If the seal is improved by increasing the compression, the friction between the pile and the other surface is such that the two surfaces cannot be readily moved relatively to one another in a direction parallel to the surfaces. The sealing strip endeavours to overcome this problem by having a yarn of a lower coefficient of friction than the fibres of the pile at or above the surface of the pile. This reduces the frictional force between the pile and the other surface thus allowing easy relative movement of the surfaces when the pile is highly compressed by the other surface to form an effective seal.
Inventors
- 👤 John F. C. Garnett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 04:51
CPC Classifications
E; E06; E06B; E06B7/00; E06B7/16; E06B7/22; E06B7/23; Y; Y10; Y10T; Y10T428/00; Y10T428/23907; Y10T428/23929; Y10T428/23957; Y10T428/23979; Y10T428/23993
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
128 words
A sealing strip for forming a seal between two adjacent surfaces which are relatively movable by manual operation and comprising an elongate strip-like base for attachment to one of said surfaces, parallel rows of pile formed by fibres of a polypropylene yarns extending from the base to contact the other of said surfaces, and a polytetrafluoroethylene yarn which has a lower coefficient of friction than the polypropylene yarn and which is carried on the strip-like base with the pile of fibres to contact the other of said surfaces whereby when the sealing strip is compressed between said surfaces, the polytetrafluoroethylene yarn reduces the frictional force tending to prevent relative movement between said pile and the surface contacted thereby in a direction parallel to the length of said base.
Claim 2
Dependent Claim
128 words
A sealing strip for forming a seal between two adjacent surfaces which are relatively movable by manual operation and comprising an elongate strip-like base for attachment to one of said surfaces, parallel rows of pile formed by fibres of a polypropylene yarns extending from the base to contact the other of said surfaces, and a polytetrafluoroethylene yarn which has a lower coefficient of friction than the polypropylene yarn and which is carried on the strip-like base with the pile of fibres to contact the other of said surfaces whereby when the sealing strip is compressed between said surfaces, the polytetrafluoroethylene yarn reduces the frictional force tending to prevent relative movement between said pile and the surface contacted thereby in a direction parallel to the length of said base.
Claim 3
Dependent Claim
23 words
A strip according to claim 1, wherein the polytetrafluoroethylene yarn is in the form of an additional pile of fibres on the base.
Claim 4
Dependent Claim
35 words
A strip according to claim 2, wherein the yarns of both piles are arranged in parallel rows extending along the base and the polytetrafluoroethylene yarn forms at least a part of at least one row.
Claim 5
Dependent Claim
22 words
A strip according to claim 3, wherein the or each row of polytetrafluoroethylene yarn is between two rows of the polypropylene yarn.
Claim 6
Dependent Claim
28 words
A strip according to claim 3, wherein the polytetrafluoroethylene yarn forms a continuous row extending along the base and between at least two rows of the polypropylene yarn.
Claim 7
Dependent Claim
21 words
A strip according to claim 3, wherein each row of both yarns is formed by a row of tufts of fibres.
Claim 8
Dependent Claim
36 words
A strip according to claim 6, wherein the tufts of the or each row of the polytetrafluoroethylene yarn have a greater spacing therebetween along the length of the row than the tufts of the polypropylene yarn.
Claim 9
Dependent Claim
25 words
A strip according to claim 2, wherein the pile of polytetrafluoroethylene yarn has a greater pile height than the pile formed by the polypropylene yarn.
Claim 10
Dependent Claim
41 words
A strip according to claim 1, wherein the polytetrafluoroethylene yarn is arranged to lay on the surface of the pile of the polypropylene yarn to form at least one continuous or substantially continuous line of such material extending along the base.
Claim 11
Dependent Claim
31 words
A strip according to claim 1, wherein the polytetrafluoroethylene yarn forms a series of end-to-end stretches extending parallel to the length of the base and on the surface of the pile.
Claim 12
Dependent Claim
119 words
A method of manufacturing a sealing strip as claimed in claim 1, the method comprising form parallel rows of pile of a polypropylene yarn on an elongate strip-like base for attachment to one of said surfaces and arranging a polytetrafluoroethylene yarn of a lower coefficient of friction that the polypropylene yarn on the elongate strip-like base with the pile of fibres, whereby the polytetrafluoroethylene yarn and the pile of the polypropylene yarn contact and are compressed by the other of said surfaces to form a seal between the two surfaces and to reduce the frictional forces tending to prevent relative movement between the pile and the surface contacted thereby in a direction parallel to the length of the base.
Claim 13
Dependent Claim
25 words
A method according to claim 11, wherein the polytetrafluoroethylene yarn is formed by fibres of said material extending from the base and forming a pile.
Claim 14
Dependent Claim
21 words
A method according to claim 12, and comprising forming both of the piles from rows of tufts extending along the base.
Claim 15
Dependent Claim
17 words
A method according to claim 13, wherein the formation of the tufts is by a weaving process.
Claim 16
Dependent Claim
17 words
A method according to claim 13, wherein the formation of the tufts is by a tufting process.
Claim 17
Dependent Claim
28 words
A method according to claim 13, wherein the methods comprises forming the polytetrafluoroethylene pile yarn by a tufting process and forming the polypropylene pile by a weaving process.
Claim 18
Dependent Claim
16 words
A method according to claim 16, wherein the weaving process is performed before the tufting process.
Claim 19
Dependent Claim
41 words
A method according to claim 16, wherein the weaving process comprises weaving the polypropylene yarn between two parallel but spaced woven warps and wefts forming respective bases and then cutting the polypropylene yarn between the base to procude two pile-bearing bases.
Claim 20
Dependent Claim
38 words
A method according to claim 11, wherein the polytetrafluoroethylene yarn is arranged on the surface of the pile to form a generally continuous line of yarn extending over the pile of the polypropylene yarn and along the base.
Claim 21
Dependent Claim
36 words
A method according to claim 19, wherein the polytetrafluoroethylene yarn is arranged with a series of end-to-end stretches of the yarn extending parallel to the length of the base and on the surface of the pile.
Claim 22
Dependent Claim
30 words
A method according to claim 20, wherein the stretches of the polytetrafluoroethylene yarn are formed by a tufting process with the yarn not being but after insertion into the base.
Claim 23
Dependent Claim
136 words
A sealing strip for providing an air barrier between two surfaces relatively movable by manual operation, the sealing strip comprising: an elongate fabric base for attachment to one of said relatively movable surfaces, a polypropylene yarn applied to the fabric base by a tufting process to form parallel rows of yarn loops with the ends thereof remote from the fabric base contacting the other end of said relatively movable surfaces, and a polytetrafluoroethylene yarn applied to the fabric base by a tufting process to form yarn loops located within the polypropylene yarn and contacting the other of said relatively movable surfaces, the polytetrafluoroethylene yarn having a lower coefficient of friction that the polypropylene yarn to reduce the frictional forces tending to prevent relative movement between the sealing strip and the other of said relatively movable surfaces.
Claim 24
Dependent Claim
136 words
A sealing strip for providing an air barrier between two surfaces relatively movable by manual operation, the sealing strip comprising: an elongate fabric base for attachment to one of said relatively movable surfaces, a polypropylene yarn applied to the fabric base by a tufting process to form parallel rows of yarn loops with the ends thereof remote from the fabric base contacting the other end of said relatively movable surfaces, and a polytetrafluoroethylene yarn applied to the fabric base by a tufting process to form yarn loops located within the polypropylene yarn and contacting the other of said relatively movable surfaces, the polytetrafluoroethylene yarn having a lower coefficient of friction that the polypropylene yarn to reduce the frictional forces tending to prevent relative movement between the sealing strip and the other of said relatively movable surfaces.
Claim 25
Dependent Claim
115 words
A method of manufacturing a sealing strip as claimed in claim 22, the method comprising: apply a polypropylene yarn to an elongate fabric base by a tufting process to form a first plurality of loops in parallel rows on said base, the first yarn loops contacting the other of said relatively movable surfaces for forming an air barrier in a direction transverse to the length of the elongate fabric base. applying a polytetrafluoroethylene yarn to said elongate fabric base by a tufting process to form a second plurality of loops on said base and contacting said other of said relatively movable surfaces, the polytetrafluoroethylene yarn having a lower coefficient of friction than said polypropylene yarn.
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) | 1988-10-21 | 1989-04-22 | 1989-10-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-10-21 | 1993-04-22 | 1993-10-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-10-21 | 1997-04-22 | 1997-10-22 | $7700.00 | Window Closed / Lapsed |