Patent US4650715A successfully refreshed from Google Patents.
US4650715A
Expired / Lapsed
US
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Element for transmission of tractive forces
Assignee: Kupferdraht-Isolierwerk AG Wildegg
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Filing: 1983-05-03
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Granted: 1987-03-17
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Expires: 2003-05-03
Abstract
Abstract Modern synthetic fibers, e.g. made of aromatic polyamides of high tensile strength have not achieved their potential for use as heavy-duty cables because of their smooth surface which gives rise to considerable difficulties in the transfer of high tensile forces, since they slip out of the clamping sleeves, and other force-transfer means based upon static friction, before reaching their ultimate tensile strength. This problem was solved in the invention by applying to the force-transmitting region thereof an impregnating material which breaks down into powder in the area to which the stress is applied, when the compressive or flexural stress exceeds the ultimate stress limit of the impregnating material. Particularly suitable for this purpose are natural resins, more particularly colophonium.
Inventors
- 👤 Othmar Voser
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 01:45
CPC Classifications
D; D07; D07B; D07B1/00; D07B1/16; D07B1/162; D06; D06M; D06M15/00; D06M15/01; D07B1/02; D07B1/025; D07B5/00; H; H01; H01B; H01B7/00; H01B7/17; H01B7/18; H01B7/182; D07B2205/00; D07B2205/20; D07B2205/2046; D07B2205/205; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2927; Y10T428/2933; Y10T428/294; Y10T428/2942; Y10T428/2947; Y10T428/2964; Y10T428/2967; Y10T428/2969; Y10T428/2971; Y10T428/2973; Y10T428/2976; Y10T428/2978
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
178 words
An elongated element for transferring tensile loads comprising connecting means connected to the end regions thereof and transferring a tensile load thereto and a bundle of a plurality of artificial fibres having smooth surfaces and a tensile strength in excess of 200 kg/mm 2 , a modulus of elasticity in excess of 3000 kg/mm 2 , and an elongation at rupture of less than 10%, said bundle of fibres, in order to reduce the risk of slippage in the connecting regions of said element due to their smooth surfaces, being impregnated, at least over at least the connecting regions thereof, with an impregnating material uniting the fibres of the element, said impregnating material when subjected to compressive and/or bending stress exceeding its ultimate strength for such stress breaking down into a crystalline powder within the stressed areas and being broken down into such a powder within the connecting regions thereby causing within such regions a wedging action both between the individual fibres of the bundle as well as at the exterior surface of the bundle as a whole.
Claim 2
Dependent Claim
178 words
An elongated element for transferring tensile loads comprising connecting means connected to the end regions thereof and transferring a tensile load thereto and a bundle of a plurality of artificial fibres having smooth surfaces and a tensile strength in excess of 200 kg/mm 2 , a modulus of elasticity in excess of 3000 kg/mm 2 , and an elongation at rupture of less than 10%, said bundle of fibres, in order to reduce the risk of slippage in the connecting regions of said element due to their smooth surfaces, being impregnated, at least over at least the connecting regions thereof, with an impregnating material uniting the fibres of the element, said impregnating material when subjected to compressive and/or bending stress exceeding its ultimate strength for such stress breaking down into a crystalline powder within the stressed areas and being broken down into such a powder within the connecting regions thereby causing within such regions a wedging action both between the individual fibres of the bundle as well as at the exterior surface of the bundle as a whole.
Claim 3
Dependent Claim
13 words
An element according to claim 1, wherein said impregnating material is a resin.
Claim 4
Dependent Claim
16 words
An element according to claim 2, wherein said resin consists at least mainly of natural resin.
Claim 5
Dependent Claim
12 words
An element according to claim 3, wherein said natural resin is colophonium.
Claim 6
Dependent Claim
16 words
An element according to claim 1, wherein said synthetic fibres are formed of an organic polymer.
Claim 7
Dependent Claim
49 words
An element according to claim 5, wherein said organic polymer is an aromatic polyamide, and wherein said fibres have a tensile strength of at least 250 kg/mm 2 , a modulus of elasticity of at least 10,000 kg/mm 2 , and an elongation at rupture of less than 3%.
Claim 8
Dependent Claim
24 words
An element according to claim 1, wherein said synthetic fibres are arranged in said bundle in a strand-like form in parallel with each other.
Claim 9
Dependent Claim
12 words
An element according to claim 1, wherein said synthetic fibres are stranded.
Claim 10
Dependent Claim
71 words
The element of claim 1 wherein said bundle adjacent at least one end portion thereof is bent backwardly upon itself to form a closed loop and each such loop is secured by a clamping element clampingly engaging a section of the thus bent back portion and a bundle section to which the end portion is bent back, and said impregnating material impregnates at least said two bundle sections thus clampingly engaged.
Claim 11
Dependent Claim
20 words
An element according to claim 9, wherein said clamping element comprises at least one clamping sleeve with rounded end edges.
Claim 12
Dependent Claim
15 words
An element according to claim 9, wherein said loop encircles a circular eye or thimble.
Claim 13
Dependent Claim
21 words
An element according to claim 11, wherein said loop encircles a circular eye and is wound several turns around said eye.
Claim 14
Dependent Claim
28 words
An element according to claim 1, wherein said element has an external protective covering enclosing the fibre bundle and protecting the same against weathering and other external influences.
Claim 15
Dependent Claim
14 words
An element according to claim 13, wherein said protective covering is made of polyurethane.
References Cited (Backward Citations)
US2331840A
Cited
US2348552A
Cited
US2561487A
Cited
US2819988A
Cited
US3540203A
Cited
US3498038A
Cited
CA1024228A
Cited
US4202164A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-03-16 | 1990-09-15 | 1991-03-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-03-16 | 1994-09-15 | 1995-03-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-03-16 | 1998-09-15 | 1999-03-17 | $7700.00 | Window Closed / Lapsed |