Patent US3800522A successfully refreshed from Google Patents.
US3800522A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sealed wire rope and strand and method of making
Assignee: WILLIAMSPORT WIREROPE WORKS Inc A CORP OF PA
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Filing: 1972-08-09
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Granted: 1974-04-02
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Expires: 1992-08-09
Abstract
Abstract A wire rope or strand is impregnated with a plastic foam type internal sealant to cushion the wires and strands and provide corrosion protection by (a) initially impregnating the strand with a foamable plastic composition, (b) heating the strand under ''''free-blowing'''' conditions to foam the plastic composition uniformly about the wires or strands, and (c) preferably finally collapsing the foam material upon the surface of the strand by means of a cold die to form a dense outer plastic jacket. The foamable plastic composition before foaming serves as a lubricant within the stranding die so that no additional stranding lubricant is required. The resulting plastic impregnated wire rope or strand has uniform low interwire foam filler densities. Alternative constructions of impregnated rope or strand can be made.
Inventors
- 👤 C Hughes
- 👤 H Graham
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 08:26
CPC Classifications
D; D07; D07B; D07B1/00; D07B1/16; D07B1/162; D07B1/165; D07B7/00; D07B7/02; D07B7/14; D07B7/145; D07B2201/00; D07B2201/20; D07B2201/2015; D07B2201/2042; D07B2201/2044; D07B2201/2046; D07B2201/2047; D07B2201/2052; D07B2201/2053; D07B2201/2054; D07B2201/2075; D07B2201/2077; D07B2201/2079; D07B2201/2081; D07B2201/2082; D07B2207/00; D07B2207/40; D07B2207/404; D07B5/00; D07B5/002
Claims Analysis
Total Claims: 26
Claim 1
Independent Claim
40 words
A method of fabricating a cable according to claim 1 wherein the linear components are formed into a wire cable in a stranding die in which the foamable plastic composition serves as substantially the sole lubricant of the stranding operation.
Claim 2
Dependent Claim
28 words
A method of fabricating a cable according to claim 2 wherein the foamable plastic composition is applied to the linear components prior to their reaching the stranding die.
Claim 3
Dependent Claim
26 words
A method of fabricating a cable according to claim 2 wherein the foamable plastic composition is applied to the linear components substantially within the stranding die.
Claim 4
Dependent Claim
102 words
A method of fabricating a cable according to claim 2 additionally comprising: e. passing the cable subsequent to the free foaming step of (d) and before the plastic foam composition completely sets through a cold die means having an inside diameter greater than the outside diameter of the metallic portions of said cable but smaller than the overall dimensions of the foamed plastic portion of the cable whereby at least a portion of the foamed plastic composition upon the surface of the cable is smoothed and compacted into an integral hard dense protective layer of plastic surrounding the foamed plastic impregnated cable.
Claim 5
Dependent Claim
31 words
A method of fabricating a cable according to claim 5 wherein an outer jacket of dense plastic is subsequently extruded over the hard, dense layer of plastic formed in step (e).
Claim 6
Dependent Claim
39 words
A method of fabricating a cable according to claim 6 wherein the outer jacket of dense plastic extruded over the layer of step (e) is composed of a plastic having a different chemical composition from the foamed plastic layers.
Claim 7
Dependent Claim
105 words
A method of fabricating a cable according to claim 1 additionally comprising: e. passing the cable subsequent to the free foaming step of (d) and before the plastic foam composition completely sets through a cold die means having an inside diameter greater then the outside diameter of the metallic portions of said cable but smaller than the overall dimensions of the foamed plastic upon the outer portions of the cable whereby at least a portion of the foamed plastic composition upon the surface of the cable is smoothed and compacted into an integral hard dense protective layer of plastic surrounding the foamed plastic impregnated cable.
Claim 8
Dependent Claim
31 words
A method of fabricating a cable according to claim 8 wherein an outer jacket of dense plastic is subsequently extruded over the hard, dense layer of plastic formed in step (e).
Claim 9
Dependent Claim
39 words
A method of fabricating a cable according to claim 9 wherein the outer jacket of dense plastic extruded over the layer of step (e) is composed of a plastic having a different chemical composition from the foamed plastic layers.
Claim 10
Dependent Claim
46 words
A method of fabricating a cable according to claim 1 additionally comprising: e. cooling the foamed plastic composition to harden said plastic foam, and f. stripping the outer layers of foam from the surface of the wire rope to leave a substantially bare wire rope surface.
Claim 11
Dependent Claim
72 words
A method of fabricating a cable according to claim 11 wherein the cable is a wire rope and the stripping of the outer plastic layers is accomplished while the plastic is in a condition such that the outer layers of plastic are removed along partinG lines extending between adjacent wires and adjacent strands in said wire rope at substantially the point of closest clearance between the said adjacent wires and adjacent strands.
Claim 12
Dependent Claim
37 words
A method of fabrication of a cable according to claim 12 wherein the cable is passed between rotating brushes to effect the stripping of the outer layers of plastic foam from the surface of the wire rope.
Claim 13
Dependent Claim
38 words
A method of fabricating a cable according to claim 11 additionally comprising: g. applying a heavy outer plastic jacket about the bare outer surface of the strand in intimate contact with the outer metal surface of the rope.
Claim 14
Dependent Claim
22 words
A method of fabricating a cable according to claim 14 in which the outer plastic jacket is extruded upon the wire rope.
Claim 15
Dependent Claim
61 words
A method of fabricating a cable according to claim 1 additionally comprising: e. wiping substantially all foamed plastic from the surface of the cable immediately subsequent to foaming of said plastic composition in step (d) while said foam remains unhardened, f. quenching said cable in a cooling fluid immediately subsequent to wiping the foamed plastic from the surface of said cable.
Claim 16
Dependent Claim
117 words
A wire rope sealed against internal migration of corrosive agents comprising: a. a plurality of wire strands helically laid about each other to form a wire rope having an exposed exterior surface, b. a plastic foam impregnating the interior of the said strands and the interior of the wire rope and intimately surrounding and contacting the interior surfaces of all component wires of said strands, c. the internal plastic foam impregnation extending at least to the point of closest clearance between adjacent outer wires of said strands and between the wires of adjacent outer strands but not extending over the exterior surfaces of the outer strands and wire which are exposed to potential contact with adjacent objects.
Claim 17
Dependent Claim
36 words
A wire rope according to claim 17 additionally comprising: d. an outer dense plastic jacket surrounding the outside of said wire rope and contacting the surfaces of the outer wires of said strands of said rope.
Claim 18
Dependent Claim
22 words
A wire rope according to claim 18 wherein the dense outer jacket is in intimate contact with the plastic foam internal impregnant.
Claim 19
Dependent Claim
28 words
A wire rope according to claim 18 wherein the outer dense plastic jacket is an extruded jacket having a different chemical composition from the plastic foam internal impregnant.
Claim 20
Dependent Claim
28 words
A wire rope according to claim 19 wherein the outer dense plastic jacket is an extruded jacket having a different chemical composition from the plastic foam internal impregnant.
Claim 21
Dependent Claim
95 words
A wire strand sealed against internal migration of corrosive agents comprising: a. a plurality of wires forming a wire strand having an exposed exterior surface, b. a plastic foam impregnating the interior of said strand and intimately surrounding and contacting the interior surfaces of all component wires of said strand, c. the internal plastic foam impregnation extending at least to the point of closest clearance between adjacent outer wires of said strand but not extending over the exterior surfaces of the outer wires of the strand which are exposed to potential contact with adjacent objects.
Claim 22
Dependent Claim
34 words
A wire strand according to claim 19 additionally comprising: d. an outer dense plastic jacket surrounding the outside of said wire strand and contacting the outer surfaces of the outer wires of said strands.
Claim 23
Dependent Claim
23 words
A wire strand according to claim 23 wherein the dense outer plastic jacket is in intimate contact with the plastic foam internal impregnant.
Claim 24
Dependent Claim
28 words
A wire strand according to claim 23 wherein the outer dense plastic jacket is an extruded jacket having a different chemical composition from the plastic foam internal impregnant.
Claim 25
Dependent Claim
45 words
A wire rope according to claim 17 wherein the internal plastic foam impregnation extends not substantially farther outward between the various strands and wires then the point of closest clearance between adjacent outer wiRes of said strands and between the wires of adjacent outer strands.
Claim 26
Dependent Claim
39 words
A wire strand according to claim 22 wherein the internal plastic foam impregnation extends not substantially farther outward between the outer wires of the strand than the point of closest clearance between the adjacent outer wires of said strands.
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) | 1977-04-01 | 1977-10-01 | 1978-04-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-04-01 | 1981-10-01 | 1982-04-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-04-01 | 1985-10-01 | 1986-04-02 | $7700.00 | Window Closed / Lapsed |