Patent US3577636A successfully refreshed from Google Patents.
Patent US3900627A successfully refreshed from Google Patents.
US3900627A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Conveyor belt
Assignee: Industrie Pirelli SpA
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Filing: 1972-12-14
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Granted: 1975-08-19
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Expires: 1992-12-14
Abstract
Abstract A natural or synthetic rubber or other elastomeric or plastic conveyor belt is reinforced with an embedded fabric layer disposed on each side of at least one layer of coplanar substantially parallel cords having their axis extending along the greatest dimension of the belt. A layer of elastomer or plastic is interposed between each fabric layer and the adjacent layer of cords and the ratio between the thickness of each layer of elastomer or plastic and the diameter of one cord is smaller than 0.166 and the ratio between the distance between two adjacent cords, measured between their axes, and the diameter of one cord is from 1.5 to 6, so as to obtain an optimum flexibility and fatigue resistance.
Inventors
- 👤 Attilio Angioletti
- 👤 Aurelio Brollo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 13:31
CPC Classifications
B; B65; B65G; B65G15/00; B65G15/30; B65G15/32; B65G15/34; B29; B29D; B29D29/00; B29D29/06; B65G15/36; B65G2201/00; B65G2201/06; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24132; Y10T428/24942; Y10T428/2495
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
198 words
A CONVEYOR BELT COMPRISING A LAYER OF ELASTOMERIC MATERIAL, AT LEAST ONE LAYER OF COPLANAR CORDS EMBEDDED IN THE SAID ELASTOMERIC MATERIAL AND DISPOSED PARALLEL TO ONE ANOTHER AND ARRANGED ALONG THE LARGER DIMENSION OF THE BELT, THE DIAMETER OF THE CORDS BEING SUBSTANTIALLY EQUAL TO THE THICKNESS OF THE ELASTOMERIC MATERIAL LAYER, A LAYER OF FABRIC DISPOSED ON EACH SIDE OF THE LAYER OF CORDS, AN ELASTOMERIC MATERIAL DISPOSED BETWEEN EACH FABRIC LAYER AND THE ADJACENT LAYER OF CORDS AND A COVER LAYER OF ELASTOMERIC MATERIAL DISPOSED AT EACH FACE OF THE CONVEYOR BELT, SAID FABRICS HAVING THEIR WARP THREADS ARRANGED ALONG THE LARGER DIMENSION OF THE CONVEYOR BELT AND THEIR WEFT THREADS ARRANGED TRANSVERSELY TO THE CONVEYOR BELT, SAID WARP THREADS HAVING AN EXTENSIBILITY GREATER THAN THAT OF THE CORD, SAID WEFT THREADS HAVING AN EXTENSIBILITY LESS THAN THAT OF THE WARP THREADS, THE RATIO OF THE THICKNESS OF THE LAYERS OF ELASTOMERIC MATERIAL DISPOSED BETWEEN THE FABRIC AND SAID LAYER OF CORDS TO THE DIAMETER OF SAID CORDS BEING LESS THAN 0.166, AND THE RATIO OF THE DISTANCE BETWEEN THE AXES OF TWO CORDS AND THE DIAMEER OF ONE CORD RANGING BETWEEN 1.5 AND 6.
Claim 2
Dependent Claim
198 words
A CONVEYOR BELT COMPRISING A LAYER OF ELASTOMERIC MATERIAL, AT LEAST ONE LAYER OF COPLANAR CORDS EMBEDDED IN THE SAID ELASTOMERIC MATERIAL AND DISPOSED PARALLEL TO ONE ANOTHER AND ARRANGED ALONG THE LARGER DIMENSION OF THE BELT, THE DIAMETER OF THE CORDS BEING SUBSTANTIALLY EQUAL TO THE THICKNESS OF THE ELASTOMERIC MATERIAL LAYER, A LAYER OF FABRIC DISPOSED ON EACH SIDE OF THE LAYER OF CORDS, AN ELASTOMERIC MATERIAL DISPOSED BETWEEN EACH FABRIC LAYER AND THE ADJACENT LAYER OF CORDS AND A COVER LAYER OF ELASTOMERIC MATERIAL DISPOSED AT EACH FACE OF THE CONVEYOR BELT, SAID FABRICS HAVING THEIR WARP THREADS ARRANGED ALONG THE LARGER DIMENSION OF THE CONVEYOR BELT AND THEIR WEFT THREADS ARRANGED TRANSVERSELY TO THE CONVEYOR BELT, SAID WARP THREADS HAVING AN EXTENSIBILITY GREATER THAN THAT OF THE CORD, SAID WEFT THREADS HAVING AN EXTENSIBILITY LESS THAN THAT OF THE WARP THREADS, THE RATIO OF THE THICKNESS OF THE LAYERS OF ELASTOMERIC MATERIAL DISPOSED BETWEEN THE FABRIC AND SAID LAYER OF CORDS TO THE DIAMETER OF SAID CORDS BEING LESS THAN 0.166, AND THE RATIO OF THE DISTANCE BETWEEN THE AXES OF TWO CORDS AND THE DIAMEER OF ONE CORD RANGING BETWEEN 1.5 AND 6.
Claim 3
Dependent Claim
27 words
The conveyor belt of claim 1 wherein the ratio between the distance between two adjacent cords and the diameter of one cord is from 2.4 to 5.
Claim 4
Dependent Claim
43 words
The conveyor belt of claim 1 wherein the ratio between the modulus of elasticity of the fabric in the direction of the larger dimension of the conveyor belt and the modulus of elasticity of the cords is smaller than 16 X 10 3.
Claim 5
Dependent Claim
47 words
The conveyor belt of claim 1 wherein the ratio between the modulus of elasticity of the fabric in the direction of the larger dimension of the conveyor belt and the modulus of elasticity of the cords is from 6.5 X 10 3 to 1.2 X 10 3.
Claim 6
Dependent Claim
17 words
The conveyor belt of claim 1 wherein two layers of spaced cords are abutted against each other.
Claim 7
Dependent Claim
14 words
The conveyor belt of claim 9 wherein said cover layers are free from cords.
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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) | 1978-08-18 | 1979-02-17 | 1979-08-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-18 | 1983-02-17 | 1983-08-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-18 | 1987-02-17 | 1987-08-19 | $7700.00 | Window Closed / Lapsed |