US3926445A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Convolutely wound gasket
Assignee: FD FARNAM Inc
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Filing: 1973-09-26
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Granted: 1975-12-16
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Expires: 1993-09-26
Abstract
Abstract A gasket having improved sealing properties and the method of forming such a gasket wherein a continuous strip or web of gasket material is wound on a core with the core having a crosssectional configuration corresponding to the internal configuration of the gasket being made. The web material is wound upon itself and, in the preferred embodiment, has a series of intermediate bonding layers of a fluid-impermeable polymer material which in the end product form a plurality of parallel fluid barriers to produce effective sealing. The winding of the web material on the core and the application of the polymer material to the web provides a tube which is then cut into preselected thicknesses to provide individual gaskets. Additional polymer material may be provided on the cut or exposed surfaces of the gasket if desired. The cross-sectional flange width of the gasket is dictated solely by the convolute gasket material and the polymer material layer or layers. One aspect of the improved method consists in preparing a roll of the gasket material which is to be wound on the core with the base material having applied to one or both sides thereof an adhesive coating which has been dried, at least to the extent that it will not adhere or cohere to itself when rolled upon itself, before the tube is formed. The coatings on the prepared roll may be individually tailored to provide a very thin coating on one side and a relatively thicker coating on the other side which are substantially dimensionally stable when applied to the web and when the prepared material is formed into convolute tubes.
Inventors
- 👤 Robert G Farnam
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 22:03
CPC Classifications
B; B05; B05C; B05C9/00; B05C9/04; B05C1/00; B05C1/003; B05C1/04; B05C1/08; B05C1/0826; B05C1/12; B65; B65H; B65H81/00; B65H81/06; F; F16; F16J; F16J15/00; F16J15/02; F16J15/06; F16J15/10; F16J15/104; F16J15/108; F16J15/16; F16J15/18; F16J15/20; F16L; F16L23/00; F16L23/16; F16L23/18; F16L23/20; Y; Y10; Y10S; Y10S277/00; Y10S277/935; Y10S277/936; Y10S285/00; Y10S285/91
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
419 words
A washer type gasket comprising: a planar body of closed marginal configuration defining an open center, and inner marginal rim in circumambient relation about the body center and an outer marginal rim in circumambient relation about the body, said body comprising: a layer of gasket material convoluted in multiply form about the body center to define a gasket material convolution having one end of the layer adjacent the body inner rim and the other end of the layer adjacent the body outer rim, with the convolution being disposed so that the width dimension of said layer extends normally of the plane of said body, the thickness dimension of said layer extends in the plane of said body, and the length dimension of said layer between said ends thereof lies about and coincident with said convolution, said layer between its said ends being continuous and uninterrupted about said convolution and defining opposed side surfaces facing respectively inwardly and outwardly of the body relative to its center, in the plane of said body, and opposed side edges facing normally of the plane of said body, and a continuous and uninterrupted layer of fluid impermeable polymeric material between and bonding together the juxtaposed side surfaces of said gasket material layer, said layer of fluid impermeable polymeric material coating and being in sealing relation to said gasket material layer side surfaces uniformly thereacross for the length of said gasket material layer between said ends thereof, with said gasket material layer between said side surfaces thereof and across its said thickness dimension being free of impregnation with said polymeric material for the length of said gasket material layer whereby said polymeric layer is discrete relative to said gasket material layer, and with said layer of fluid impermeable material being of uniform thickness across said gasket material side surfaces of the length of said gasket material layer, said layer of polymeric material comprising adjacent stratums of said polymeric material extending congruently with and respectively adhered to the respective juxtaposed gasket layer side surfaces and uniformly bonded together, said layer of gasket material including therein, between said ends thereof and across the width dimension thereof reinforcing fibers some of which extend longitudinally of said gasket material layer length dimension and others of which extend laterally of said gasket material layer along said gasket material layer width dimension and in the direction of said side edges thereof, with said longitudinally extending fibers and said laterally extending fibers being in a ratio of approximately 2 to 1, respectively.
Claim 2
Dependent Claim
419 words
A washer type gasket comprising: a planar body of closed marginal configuration defining an open center, and inner marginal rim in circumambient relation about the body center and an outer marginal rim in circumambient relation about the body, said body comprising: a layer of gasket material convoluted in multiply form about the body center to define a gasket material convolution having one end of the layer adjacent the body inner rim and the other end of the layer adjacent the body outer rim, with the convolution being disposed so that the width dimension of said layer extends normally of the plane of said body, the thickness dimension of said layer extends in the plane of said body, and the length dimension of said layer between said ends thereof lies about and coincident with said convolution, said layer between its said ends being continuous and uninterrupted about said convolution and defining opposed side surfaces facing respectively inwardly and outwardly of the body relative to its center, in the plane of said body, and opposed side edges facing normally of the plane of said body, and a continuous and uninterrupted layer of fluid impermeable polymeric material between and bonding together the juxtaposed side surfaces of said gasket material layer, said layer of fluid impermeable polymeric material coating and being in sealing relation to said gasket material layer side surfaces uniformly thereacross for the length of said gasket material layer between said ends thereof, with said gasket material layer between said side surfaces thereof and across its said thickness dimension being free of impregnation with said polymeric material for the length of said gasket material layer whereby said polymeric layer is discrete relative to said gasket material layer, and with said layer of fluid impermeable material being of uniform thickness across said gasket material side surfaces of the length of said gasket material layer, said layer of polymeric material comprising adjacent stratums of said polymeric material extending congruently with and respectively adhered to the respective juxtaposed gasket layer side surfaces and uniformly bonded together, said layer of gasket material including therein, between said ends thereof and across the width dimension thereof reinforcing fibers some of which extend longitudinally of said gasket material layer length dimension and others of which extend laterally of said gasket material layer along said gasket material layer width dimension and in the direction of said side edges thereof, with said longitudinally extending fibers and said laterally extending fibers being in a ratio of approximately 2 to 1, respectively.
Claim 3
Dependent Claim
34 words
The gasket set forth in claim 1 wherein: the side edges of said gasket material layer each bear a coating of fluid impermeable polymeric material which are integral with said layer of polymeric material.
Claim 4
Dependent Claim
42 words
The gasket set forth in claim 2 wherein: the portions of said gasket body defining the inner and outer rims of same each bear a coating of fluid impermeable polymeric material which are integral with said side edge coatings of polymeric material.
Claim 5
Dependent Claim
48 words
The gasket set forth in claim 1 wherein: one of said stratums has a thickness in the range of from about 0.0002 inch to about 0.010 inch, and the other of said stratum has a thickness in the range of from about 0.0001 inch to about 0.0005 inch.
Claim 6
Dependent Claim
488 words
A washer typE gasket comprising: a planar body of closed marginal configuration defining an open center, an inner marginal rim about the body center and an outer rim in circumambient relation about the body, said body comprising: a layer of gasket material convoluted in multiply form about the body center to define a gasket material convolution having one end of the layer at the body inner rim and the other end of the layer at the body outer rim, with the convolution being disposed so that the width dimension of said layer extends normally of the plane of said body, the thickness dimension of said layer extends in the plane of said body, and the length dimension of said layer between said ends thereof lies about and coincident with said convolution, said layer between its said ends being continuous and uninterrupted about said convolution and defining opposed side surfaces facing respectively inwardly and outwardly of the body relative to its center, in the plane of said body, and opposed side edges facing normally of the plane of said body, and a continuous and uninterruped layer of fluid impermeable polymeric material between and bonding together the juxtaposed side surfaces of said gasket material layer, said layer of fluid impermeable polymeric material coating and being in sealing relation to said gasket material layer side surfaces uniformly thereacross for the length of said gasket material layer between said ends thereof and being oriented in said body such that its thickness dimension is in the plane of said body, with said gasket material layer between said side surfaces thereof and across its said thickness dimension being free of the impregnation with said polymeric material for the length of said gasket material layer whereby said polymeric layer is discrete relative to said gasket material layer, and with said layer of fluid impermeable material being of uniform thickness across said gasket material side surfaces for the length of said gasket material layer, said layer of polymeric material comprising adjacent stratums of said polymeric material extending congruently with and respectively adhered to the respective juxtaposed gasket material layer side surfaces and uniformly bonded together, one of said stratums forming the polymeric material layer coating and sealing relation of one of the gasket material layer side surfaces and the other of said stratums forming the polymeric material layer coating and sealing relation of the other of the gasket material layer side surfaces, said one stratum having a thickness of relatively thin proportions as compared to the thickness of said other stratum, whereby said one stratum serves as a primer surface for said one gasket material layer side surface to effect said bonding of said stratums together and whereby said bonded together stratums form a bond line joining said gasket material layer side surfaces that is defined by said polymeric layer whereby said thickness dimension of said bond line may exceed that of said gasket material layer.
Claim 7
Dependent Claim
488 words
A washer typE gasket comprising: a planar body of closed marginal configuration defining an open center, an inner marginal rim about the body center and an outer rim in circumambient relation about the body, said body comprising: a layer of gasket material convoluted in multiply form about the body center to define a gasket material convolution having one end of the layer at the body inner rim and the other end of the layer at the body outer rim, with the convolution being disposed so that the width dimension of said layer extends normally of the plane of said body, the thickness dimension of said layer extends in the plane of said body, and the length dimension of said layer between said ends thereof lies about and coincident with said convolution, said layer between its said ends being continuous and uninterrupted about said convolution and defining opposed side surfaces facing respectively inwardly and outwardly of the body relative to its center, in the plane of said body, and opposed side edges facing normally of the plane of said body, and a continuous and uninterruped layer of fluid impermeable polymeric material between and bonding together the juxtaposed side surfaces of said gasket material layer, said layer of fluid impermeable polymeric material coating and being in sealing relation to said gasket material layer side surfaces uniformly thereacross for the length of said gasket material layer between said ends thereof and being oriented in said body such that its thickness dimension is in the plane of said body, with said gasket material layer between said side surfaces thereof and across its said thickness dimension being free of the impregnation with said polymeric material for the length of said gasket material layer whereby said polymeric layer is discrete relative to said gasket material layer, and with said layer of fluid impermeable material being of uniform thickness across said gasket material side surfaces for the length of said gasket material layer, said layer of polymeric material comprising adjacent stratums of said polymeric material extending congruently with and respectively adhered to the respective juxtaposed gasket material layer side surfaces and uniformly bonded together, one of said stratums forming the polymeric material layer coating and sealing relation of one of the gasket material layer side surfaces and the other of said stratums forming the polymeric material layer coating and sealing relation of the other of the gasket material layer side surfaces, said one stratum having a thickness of relatively thin proportions as compared to the thickness of said other stratum, whereby said one stratum serves as a primer surface for said one gasket material layer side surface to effect said bonding of said stratums together and whereby said bonded together stratums form a bond line joining said gasket material layer side surfaces that is defined by said polymeric layer whereby said thickness dimension of said bond line may exceed that of said gasket material layer.
Claim 8
Dependent Claim
45 words
The gasket set forth in claim 5 wherein: said other stratum has a thickness in the range of from about 0.0002 inch to about 0.010 inch, and said one stratum has a thickness in the range of from about 0.0001 inch to about 0.0005 inch.
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) | 1978-12-15 | 1979-06-16 | 1979-12-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-15 | 1983-06-16 | 1983-12-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-15 | 1987-06-16 | 1987-12-16 | $7700.00 | Window Closed / Lapsed |