US4041806A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Testing cord-to-elastomer adhesion
Assignee: Goodyear Tire and Rubber Co
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Filing: 1976-10-18
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Granted: 1977-08-16
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Expires: 1996-10-18
Abstract
Abstract The adhesion of cord or wire to the elastomer, rubber, or rubbery material is measured by exerting forces or loads collinear with the cords or wires such that one of the cords or wires is pulled from between a pair of cords. The three cords are embedded in a predetermined length of the elastomer. In a static test the opposing forces are exerted at a predetermined rate. In a dynamic test the opposing forces oscillate at predetermined frequency. Fixtures adapting an MTS high-speed oscillating tester are provided. The foregoing abstract is not to be taken as limiting the invention of this application, and in order to understand the full nature and extent of the technical disclosure of this application, reference must be made to the accompanying drawing and the following detailed description.
Inventors
- 👤 Kenneth K. Klar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 15:33
CPC Classifications
G; G01; G01N; G01N19/00; G01N19/04; G01N2203/00; G01N2203/0058; G01N2203/0096; Y; Y10; Y10S; Y10S416/00; Y10S416/50
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
72 words
A method of testing a cord-to-rubber adhesion comprising selecting a specimen of cords embedded in a rubber matrix, said specimen having three parallel cords, applying a force longitudinally of the first cord in a first direction and applying a force to each cord of the pair thereof having the first cord therebetween in a second direction, and measuring the force required to cause separation between said first cord and said pair thereof.
Claim 2
Independent Claim
72 words
A method of testing a cord-to-rubber adhesion comprising selecting a specimen of cords embedded in a rubber matrix, said specimen having three parallel cords, applying a force longitudinally of the first cord in a first direction and applying a force to each cord of the pair thereof having the first cord therebetween in a second direction, and measuring the force required to cause separation between said first cord and said pair thereof.
Claim 3
Independent Claim
150 words
A method of testing a cord-to-rubber adhesion comprising providing a test specimen of cord ply having a matrix of rubber and a plurality of side-by-side parallel cords embedded therein, establishing a test zone of predetermined length parallel to said cords and extending transversely thereof intermediate the ends of the specimen, slitting said matrix between cords of each adjacent pair thereof outwardly from said zone to the respective ends of the specimen, gripping a first cord near one end of the specimen in a first clamp gripping each cord of the pair thereof having the first cord therebetween in a second clamp near the other end of the specimen, moving one of said clamps and the cord or cords gripped therein relatively of the other thereof in a direction parallel to said cords, and measuring the force exerted by said clamps to pull said first cord from between said pair thereof.
Claim 4
Independent Claim
150 words
A method of testing a cord-to-rubber adhesion comprising providing a test specimen of cord ply having a matrix of rubber and a plurality of side-by-side parallel cords embedded therein, establishing a test zone of predetermined length parallel to said cords and extending transversely thereof intermediate the ends of the specimen, slitting said matrix between cords of each adjacent pair thereof outwardly from said zone to the respective ends of the specimen, gripping a first cord near one end of the specimen in a first clamp gripping each cord of the pair thereof having the first cord therebetween in a second clamp near the other end of the specimen, moving one of said clamps and the cord or cords gripped therein relatively of the other thereof in a direction parallel to said cords, and measuring the force exerted by said clamps to pull said first cord from between said pair thereof.
Claim 5
Dependent Claim
53 words
A method as claimed in claim 2, wherein providing said specimen includes inserting said specimen in an uncured state in a mold having a plane rigid surface and an elastic diaphragm, heating said surface while applying fluid pressure to urge said diaphragm toward said surface with the specimen therebetween to cure the specimen.
Claim 6
Dependent Claim
25 words
A method as claimed in claim 2, wherein said specimen is provided from cord or wire ply stock as delivered from a ply stock calender.
Claim 7
Dependent Claim
20 words
A method as claimed in claim 2, wherein said specimen is provided by cutting the same from a cured tire.
Claim 8
Dependent Claim
91 words
A method as claimed in claim 2, further comprising tensioning said first cord between said first clamp and an associated third clamp, tensioning each cord of said pair thereof between said second clamp and an associated fourth clamp, and oscillating said first and third clamp with said first cord held therein relatively of said second clamp and fourth clamp with said pair of cords held therein at a predetermined amplitude and frequency, and measuring the force and the time required to pull said first cord from between said pair of cords.
Claim 9
Dependent Claim
146 words
Apparatus for testing cord-to-rubber adhesion comprising means for exerting linear oscillation on a test specimen including a pair of rams arranged in opposing collinear alignment one being a fixed ram having a load cell and the other being a ram for effecting oscillation of a predetermined frequency and amplitude, a chamber disposed about said rams for controlling the test environment, a pair of fixtures each having a pair of clamp jaws and means for adjustably spacing said jaws relatively of one another, one of said fixtures being associated with the fixed ram the other of said fixtures being associated with the oscillating ram, one pair of said jaws being engageable to clamp opposite ends of a selected one of a plurality of parallel cords the other pair of jaws being engageable to clamp opposite ends of a pair of said cords having the selected cord therebetween.
Claim 10
Dependent Claim
146 words
Apparatus for testing cord-to-rubber adhesion comprising means for exerting linear oscillation on a test specimen including a pair of rams arranged in opposing collinear alignment one being a fixed ram having a load cell and the other being a ram for effecting oscillation of a predetermined frequency and amplitude, a chamber disposed about said rams for controlling the test environment, a pair of fixtures each having a pair of clamp jaws and means for adjustably spacing said jaws relatively of one another, one of said fixtures being associated with the fixed ram the other of said fixtures being associated with the oscillating ram, one pair of said jaws being engageable to clamp opposite ends of a selected one of a plurality of parallel cords the other pair of jaws being engageable to clamp opposite ends of a pair of said cords having the selected cord therebetween.
Claim 11
Dependent Claim
35 words
Apparatus as claimed in claim 7, wherein said means for adjustably spacing said jaws comprises a parallel pair of turnbuckles extending between each respective pair of jaws parallel to the cord or cords clamped therein.
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) | 1980-08-15 | 1981-02-14 | 1981-08-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-08-15 | 1985-02-14 | 1985-08-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-08-15 | 1989-02-14 | 1989-08-16 | $7700.00 | Window Closed / Lapsed |