US3808352A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Elastomeric terminal insulator and stress cone and conductor terminated therewith
Assignee: 3M Co
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Filing: 1972-10-26
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Granted: 1974-04-30
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Expires: 1992-10-26
Abstract
Abstract A terminal for high voltage electrical cable comprising an elastomeric stress cone which is friction-fitted over the insulating sleeve of a power cable after the sleeve has been coated with a silicone grease, and an elastomeric terminal insulator which is supported in a stretched condition initially to have a central opening to receive the cable and which insulator is allowed to return toward its normal state to tightly fit about the insulating sleeve. The elastomeric terminal insulator is stretched about a core which core has an inside diameter larger than the outer diameter of the insulating sleeve. The core is removed progressively from one end toward the other, permitting the insulator to contract and tightly grip one end of the stress cone and a length of the insulating sleeve.
Inventors
- 👤 L Johnson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 20:49
CPC Classifications
H; H02; H02G; H02G15/00; H02G15/08; H02G15/18; H02G15/182; H02G15/1826; H02G15/1833; H02G15/02; H02G15/06; H02G15/064; H02G15/068; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49117; Y10T29/49174; Y10T29/49176; Y10T29/49178
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
210 words
A termination of a high voltage electrical poWer cable of the type having a central conductor, and an insulating sleeve between the conductor and a semiconductive shield comprising: an elastomeric boot having wall means defining a cylindrical bore having an inlet end and an outlet end, said boot having an insulating generally cone-shaped structure with an extended cylindrical thin walled sleeve portion adjacent the inlet end of said bore which portion has been unfolded from a position folded upon itself, said boot being positioned over said conductor and insulating sleeve of said cable with said extended cylindrical thin-walled sleeve portion extending over the end of said semiconductive shield and being in sealing engagement with the end of said shield, and a thin walled elastomeric insulator formed with axially spaced skirts and a cylindrical bore having a diameter the dimension of which is less than the diameter of said insulating sleeve applied over said insulating sleeve and tightly elastically gripping said sleeve, said elastomeric insulator also extending over and tightly elastically gripping the end of the boot opposite to the extended cylindrical sleeve portion and one end of said boot to insulate the exposed insulating sleeve and produce an extended path between the semiconductive shield and the end of the conductor.
Claim 2
Dependent Claim
210 words
A termination of a high voltage electrical poWer cable of the type having a central conductor, and an insulating sleeve between the conductor and a semiconductive shield comprising: an elastomeric boot having wall means defining a cylindrical bore having an inlet end and an outlet end, said boot having an insulating generally cone-shaped structure with an extended cylindrical thin walled sleeve portion adjacent the inlet end of said bore which portion has been unfolded from a position folded upon itself, said boot being positioned over said conductor and insulating sleeve of said cable with said extended cylindrical thin-walled sleeve portion extending over the end of said semiconductive shield and being in sealing engagement with the end of said shield, and a thin walled elastomeric insulator formed with axially spaced skirts and a cylindrical bore having a diameter the dimension of which is less than the diameter of said insulating sleeve applied over said insulating sleeve and tightly elastically gripping said sleeve, said elastomeric insulator also extending over and tightly elastically gripping the end of the boot opposite to the extended cylindrical sleeve portion and one end of said boot to insulate the exposed insulating sleeve and produce an extended path between the semiconductive shield and the end of the conductor.
Claim 3
Dependent Claim
19 words
A termination according to claim 1 wherein said sleeve portion of said boot is formed of a semiconductive material.
Claim 4
Dependent Claim
16 words
A termination according to claim 1 wherein the insulator is formed of a silicone rubber composition.
Claim 5
Dependent Claim
181 words
A thin walled elastomeric insulator comprising a thin walled cylinder formed with a cylindrical bore having a predetermined inside diameter the dimension of which is less than the outside diameter of an insulating sleeve over which said insulator is adapted to be placed and a plurality of axially spaced skirts formed on said cylinder which skirts taper outward from the outer periphery of said cylinder to a narrower cylindrical peripheral surface, said peripheral surface of each of the skirts being radiused on one edge and the other edge being formed with a sharper more definite edge to break surface tension of liquid moving over the surface of the skirt over said radiused edge and along the peripheral surface to said other edge, said cylinder and said skirts adjacent said outer periphery of said cylinder being stretched several times their normal size, and a hollow core member comprising a continuous narrow strip of tough flexible material in the form of a substantially rigid closed helix having adjacent coils interconnected, said core member being disposed within said cylindrical bore of said stretched cylinder.
Claim 6
Dependent Claim
181 words
A thin walled elastomeric insulator comprising a thin walled cylinder formed with a cylindrical bore having a predetermined inside diameter the dimension of which is less than the outside diameter of an insulating sleeve over which said insulator is adapted to be placed and a plurality of axially spaced skirts formed on said cylinder which skirts taper outward from the outer periphery of said cylinder to a narrower cylindrical peripheral surface, said peripheral surface of each of the skirts being radiused on one edge and the other edge being formed with a sharper more definite edge to break surface tension of liquid moving over the surface of the skirt over said radiused edge and along the peripheral surface to said other edge, said cylinder and said skirts adjacent said outer periphery of said cylinder being stretched several times their normal size, and a hollow core member comprising a continuous narrow strip of tough flexible material in the form of a substantially rigid closed helix having adjacent coils interconnected, said core member being disposed within said cylindrical bore of said stretched cylinder.
Claim 7
Dependent Claim
19 words
A thin walled elastomeric insulator according to claim 4 wherein said cylinder has a wall thickness of .1 inch.
Claim 8
Dependent Claim
20 words
A thin walled elastomeric insulator according to claim 5 wherein said core member has an outside diameter of 1.5 inches.
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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) | 1977-04-29 | 1977-10-29 | 1978-04-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-04-29 | 1981-10-29 | 1982-04-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-04-29 | 1985-10-29 | 1986-04-30 | $7700.00 | Window Closed / Lapsed |