US3898372A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Insulator with resin-bonded fiber rod and elastomeric weathersheds, and method of making same
Assignee: Hubbell Inc
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Filing: 1974-02-11
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Granted: 1975-08-05
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Expires: 1994-02-11
Abstract
Abstract Insulators made up of insulating rods surrounded by elastomeric weathersheds. The weathersheds are separately formed with central apertures having inside diameters less than the outside diameter of the rod, which is illustrated as made up of resin-bonded glass fibers, so that the weathersheds must be stretched to be placed on the rod. The required number of weathersheds are positioned on a rod and are compressed between metallic end fittings that are secured to the ends of the rod. The inner surfaces of the weathersheds are provided with annular grooves which are filled with an insulating grease. Suspension and post insulators embodying the invention are disclosed.
Inventors
- 👤 John W Kalb
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 21:38
CPC Classifications
H; H01; H01B; H01B17/00; H01B17/32; H01B17/14; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49227
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
126 words
An insulator comprising a generally cylindrical elongated member composed of dielectric material and having substantial mechanical strength, end fittings secured to said elongated member, and a series of weathersheds enclosing said elongated member and covering the entire surface of said elongated member between said fittings, the weathersheds being composed of an elastomeric insulating material, each weathershed having a through opening of a cross section in the unstressed state that is smaller than the cross section of said elongated member, whereby the weathersheds are under hoop tension at the surface of said elongated member, and the weathersheds being longitudinally compressed between said fittings, whereby the inner surfaces of the openings of the weathersheds exert pressure on said elongated member and adjacent weathersheds exert pressure on each other.
Claim 2
Dependent Claim
126 words
An insulator comprising a generally cylindrical elongated member composed of dielectric material and having substantial mechanical strength, end fittings secured to said elongated member, and a series of weathersheds enclosing said elongated member and covering the entire surface of said elongated member between said fittings, the weathersheds being composed of an elastomeric insulating material, each weathershed having a through opening of a cross section in the unstressed state that is smaller than the cross section of said elongated member, whereby the weathersheds are under hoop tension at the surface of said elongated member, and the weathersheds being longitudinally compressed between said fittings, whereby the inner surfaces of the openings of the weathersheds exert pressure on said elongated member and adjacent weathersheds exert pressure on each other.
Claim 3
Dependent Claim
23 words
An insulator according to claim 1 wherein the interfaces between said elongated member and the weathersheds are coated with plastic dielectric filling material.
Claim 4
Dependent Claim
17 words
An insulator according to claim 2 in which said dielectric filling material is a viscous, adherent material.
Claim 5
Dependent Claim
35 words
An insulator according to claim 2 wherein the openings in at least some of the weathersheds are grooved to retain and provide reservoirs for said dielectric filling material and provide labyrinth seals at these locations.
Claim 6
Dependent Claim
17 words
An insulator according to claim 4 wherein adjacent weathersheds have complementary surfaces that seal against each other.
Claim 7
Dependent Claim
20 words
An insulator according to claim 4 wherein the interfaces between adjacent weathersheds are coated with said plastic dielectric filling material.
Claim 8
Dependent Claim
16 words
An insulator according to claim 1 wherein said elongated member is composed of resin-bonded glass fibers.
Claim 9
Dependent Claim
21 words
An insulator according to claim 1 wherein the weathersheds are composed of elastomeric material containing a substantial percentage of hydrated alumina.
Claim 10
Dependent Claim
39 words
An insulator according to claim 1 wherein the weathersheds are composed of EPM rubber containing hydrated alumina in the proportion of about one and one-half parts by weight of hydrated alumina to one part by weight of EPM rubber.
Claim 11
Dependent Claim
40 words
An insulator according to claim 9 wherein said EPM rubber containing hydrated alumina has a hardness of about 70 on the Shore (A) scale, an elongation of about 300% and a tensile strength of about 1,200 pounds per square inch.
Claim 12
Dependent Claim
51 words
An insulator according to claim 9 wherein each fitting has a body portion having means for securing the fitting to a supporting or a supported element and a sleeve portion surrounding an end of said elongated member that is crimped into a generally polygonal cross section extending longitudinally of the sleeve.
Claim 13
Dependent Claim
32 words
An insulator according to claim 1 wherein each said fitting is composed of metal and has a body portion provided with a sleeve portion crimped intO firm engagement with the elongated member.
Claim 14
Dependent Claim
250 words
An insulator comprising an elongated generally cylindrical high strength tension member composed of resin-bonded glass fibers, a metal fitting secured to each end of the tension member, each fitting having a body portion provided with means for securing the fitting to a supporting element or a supported element and a sleeve portion that surrounds an end of said elongated member and is crimped into firm engagement with it, and a series of weathersheds enclosing said elongated member and covering the entire surface of said elongated member between the fittings, the weathersheds being composed of elastomeric material, each weathershed having a body portion with an opening of circular cross section and having a shield portion projecting outwardly from the body portion, the opening having a diameter in the unstressed state that is substantially less than the diameter of said elongated member whereby the weathersheds are under hoop tension when disposed on said elongated member, and the weathersheds having end surfaces that contact complementary end surfaces of adjacent weathersheds, the entire series of weathersheds being longitudinally compressed between said fittings by an amount substantially greater than the normal elongation of said elongated member in service, whereby the inner surfaces of the openings of the weathersheds exert pressure on said elongated member and adjacent weathersheds exert pressure on each other, the interfaces between the tension member and the weathersheds being coated with a dielectric filling material and the openings of the weathersheds being grooved to retain and provide reservoirs for dielectric filling material.
Claim 15
Dependent Claim
250 words
An insulator comprising an elongated generally cylindrical high strength tension member composed of resin-bonded glass fibers, a metal fitting secured to each end of the tension member, each fitting having a body portion provided with means for securing the fitting to a supporting element or a supported element and a sleeve portion that surrounds an end of said elongated member and is crimped into firm engagement with it, and a series of weathersheds enclosing said elongated member and covering the entire surface of said elongated member between the fittings, the weathersheds being composed of elastomeric material, each weathershed having a body portion with an opening of circular cross section and having a shield portion projecting outwardly from the body portion, the opening having a diameter in the unstressed state that is substantially less than the diameter of said elongated member whereby the weathersheds are under hoop tension when disposed on said elongated member, and the weathersheds having end surfaces that contact complementary end surfaces of adjacent weathersheds, the entire series of weathersheds being longitudinally compressed between said fittings by an amount substantially greater than the normal elongation of said elongated member in service, whereby the inner surfaces of the openings of the weathersheds exert pressure on said elongated member and adjacent weathersheds exert pressure on each other, the interfaces between the tension member and the weathersheds being coated with a dielectric filling material and the openings of the weathersheds being grooved to retain and provide reservoirs for dielectric filling material.
Claim 16
Dependent Claim
73 words
An insulator according to claim 13 wherein the weathersheds are composed of EPM rubber containing hydrated alumina in the proportion of about one and one-half parts by weight of hydrated alumina to one part by weight of EPM rubber and the EPM rubber containing hydrated alumina has a hardness of about 70 on the Shore (A) scale, an elongation of about 300% and a tensile strength of about 1,200 pounds per square inch.
Claim 17
Independent Claim
208 words
A method of manufacturing an insulator comprising a column of a plurality of weathersheds made of elastomeric material each having an axial opening therethrough surrounding an elongated member of dielectric material of substantial mechanical strength, which process comprises arranging the weathersheds in a column in which adjacent weathersheds abut and said axial openings are aligned to form an aperture through said column, compressing said column by an amount greater than the amount of longitudinal compression of said weathersheds in the assembled insulator, inserting through said aperture formed by the aligned axial openings of said weathersheds an elongated member of dielectric material of essentially similar cross sectional shape as said openings but of a larger cross section and of a length greater than the column of weathersheds to stretch said weathersheds, arranging said elongated member in said column so that its ends project therefrom, and rigidly securing to each of said ends a fitting member the ends of which are so located that when the compressive force on said column of weathersheds is released, said end fittings hold said weathersheds between the ends thereof under compression on said elongated member and so that there is hoop tension in said weathersheds that causes them firmly to grip said elongated member.
Claim 18
Independent Claim
208 words
A method of manufacturing an insulator comprising a column of a plurality of weathersheds made of elastomeric material each having an axial opening therethrough surrounding an elongated member of dielectric material of substantial mechanical strength, which process comprises arranging the weathersheds in a column in which adjacent weathersheds abut and said axial openings are aligned to form an aperture through said column, compressing said column by an amount greater than the amount of longitudinal compression of said weathersheds in the assembled insulator, inserting through said aperture formed by the aligned axial openings of said weathersheds an elongated member of dielectric material of essentially similar cross sectional shape as said openings but of a larger cross section and of a length greater than the column of weathersheds to stretch said weathersheds, arranging said elongated member in said column so that its ends project therefrom, and rigidly securing to each of said ends a fitting member the ends of which are so located that when the compressive force on said column of weathersheds is released, said end fittings hold said weathersheds between the ends thereof under compression on said elongated member and so that there is hoop tension in said weathersheds that causes them firmly to grip said elongated member.
Claim 19
Dependent Claim
68 words
The method of claim 15 including the step of covering at least the end of said elongated member that first enters said column with a protective covering to protect said end against plastic filling material on the elongated member or in said axial aligned openings as it passes through said column, and thereafter removing said protective covering to permit securing of said end fittings to said elongated member.
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) | 1978-08-04 | 1979-02-03 | 1979-08-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-04 | 1983-02-03 | 1983-08-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-04 | 1987-02-03 | 1987-08-05 | $7700.00 | Window Closed / Lapsed |