US3823250A
Expired / Lapsed
US
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Method and apparatus for constructing insulated cable pressure blocks
Assignee: Hexcel Corp
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Filing: 1973-06-18
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Granted: 1974-07-09
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Expires: 1993-06-18
Abstract
Abstract A sheath surrounding a multi-wire cable is opened to expose the cable core and a flexible cover sheet is placed over the resulting cut-out to cover the cut-out. The sheet is biased against the cut-out by taping it thereto and it includes an inlet port communicating the exterior of the cable with the cut-out in the sheath. An interior side of the sheet is concavely curved and has intermittent protrusions which space the sheet from the core to define passageways which communicate with the port opening so that block forming material, such as self-setting plastic can be injected into the passageways and hence into and around the multi-strung cable core. After the plastic sets, it forms a gas tight barrier or pressure block within the cable. The flattened cover sheet has a generally rectangular configuration and side dimensions of at least about 4 inches for coverage of a cut-out having side lengths of at least about 3 inches. The longitudinal center line of the sheet (parallel to the cable axis) has an increased cross-section as compared with remaining portions of the sheet to resist center flattening of the sheet when biased against the cable to enhance the formation of passageways between the concave sheet side and the cable core and to resist collapse of the sheet and a resulting destruction of the passageways.
Inventors
- 👤 Monsy R De
- 👤 N Hankins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 13:41
CPC Classifications
H; H02; H02G; H02G15/00; H02G15/20; H01; H01B; H01B13/00; H01B13/22; H01B13/221
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
64 words
A fitting according to claim 1 wherein the sheet is curved in only one direction and substantially straight in another, perpendicular direction for placement over cylindrical cables, wherein a center portion of the sheet has an arcuate configuration, and wherein the means for spacing the concave side from the coRe simultaneously defines stiffening means for the sheet resisting a flattening of the center portion.
Claim 2
Dependent Claim
35 words
A fitting according to claim 2 wherein the resisting means comprises a portion of the sheet extending over the center portion and having a thickness greater than the thickness of the remainder of the sheet.
Claim 3
Dependent Claim
32 words
A fitting according to claim 1 wherein the spacing means comprises a protrusion depending perpendicularly away from the concave side for engaging the cable core and thus spacing the concave side therefrom.
Claim 4
Dependent Claim
14 words
A fitting according to claim 4 including a plurality of independent, spaced apart protrusions.
Claim 5
Dependent Claim
19 words
A fitting according to claim 5 wherein the protrusions are arranged symmetrically with respect to the port defining means.
Claim 6
Dependent Claim
20 words
A fitting according to claim 6 wherein the protrusions are symmetric with respect to a center line of the sheet.
Claim 7
Dependent Claim
125 words
A cable sheath pressure tap fitting comprising a simply curved sheet constructed of a deformable material and including a straight longitudinal center line perpendicular to the plane of curvature of the sheet, a port protruding from a convex side of the sheet disposed at about the center of the sheet and defining an opening communicating the convex side with a concave side of the sheet, and a plurality of ribs protruding from the concave side and disposed in the vicinity of the opening, the ribs having a length substantially greater than their width for engaging and spacing the concave side from a cable core when the fitting is placed over a cable to facilitate the flow of fluid from the opening to the cable core.
Claim 8
Dependent Claim
21 words
A fitting according to claim 8 wherein the rib lengths are oriented parallel to the plane of curvature of the sheet.
Claim 9
Dependent Claim
43 words
A fitting according to claim 9 wherein the ribs are substantially symmetric with respect to the longitudinal center line of the sheet, and wherein the ribs have a length substantially less than the width of the sheet measured parallel to the rib length.
Claim 10
Dependent Claim
168 words
In combination a cable having a multiplicity of conductors defining a cable core, a sheath surrounding the core and having a generally rectangular, longitudinally oriented cut-out of at least about 3 inches in length and a width of no more than about 3 inches, and a fitting for constructing pressure blocks in the cable comprising a flexible sheet placed over the cut-out, having a generally rectangular configuration and dimensioned to completely overlap the cut-out, means biasing the sheet against the sheath to conform the sheet to the sheath configuration, a protrusion depending from the side of the sheet facing the core and engaging the core to thereby space the side from the core and define a passageway between the sheet and the core, and port means in fluid communication with the passageway defined by the sheet and positioned at about the center thereof for injecting a fluid material into the passageway and hence into and around the core to thereby form a pressure block with the injected material.
Claim 11
Dependent Claim
23 words
The combination according to claim 11 including a plurality of spaced-apart protrusions extending from the sheet towards and into contact with the core.
Claim 12
Dependent Claim
47 words
The combination according to claim 12 wherein the sheet includes an increased cross-section thickness extending over a longitudinal center portion of the sheet for resisting a full deformation of the sheet into conformity with the sheath configuration to thereby enhance the formation and maintenance of the passageway.
Claim 13
Independent Claim
99 words
A method for constructing pressure blocks in shielded cables having a core of a multiplicity of conductors enclosed in a sheath, the method comprising the steps of: providing an access opening through the sheath to the core; placing a sheet over the core; spacing the sheet from the core over a portion of the length and circumference thereof to define passageways between the core and the sheet; injecting under pressure a fluid, self-setting plastic material into the passageways and hence into the core; and permitting the plastic material in the core to set and thereby form the pressure block.
Claim 14
Dependent Claim
70 words
A method according to claim 14 wherein the steps of providing an access opening and spacing the sheet comprise the steps of first removing a portion of said sheath surrounding the core from a part of the cable to form a cut-out, and thereafter covering the cut-out with the sheet, biasing the sheet against the core and maintaining a spacing between the sheet and the core thus defining the passageways.
Claim 15
Dependent Claim
33 words
A method according to claim 15 wherein the step of forming the cut-out includes the step of forming a cut-out of a generally rectangular configuration having minimum side lengths of about 3 inches.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-07-08 | 1978-01-07 | 1978-07-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-07-08 | 1982-01-07 | 1982-07-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-07-08 | 1986-01-07 | 1986-07-09 | $7700.00 | Window Closed / Lapsed |