US3937094A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Toothed belt
Assignee: Industrie Pirelli SpA
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Filing: 1974-01-02
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Granted: 1976-02-10
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Expires: 1994-01-02
Abstract
Abstract A reinforced plastic or elastomeric drive belt having tooth-like protuberances for meshing with the teeth of a pulley is provided with a fabric covering over the toothed surface which is more rigid and more resistant to flection stresses than the body of the belt.
Inventors
- 👤 Mario Cicognani
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 20:33
CPC Classifications
B; B32; B32B; B32B5/00; B32B5/22; B32B5/24; B32B5/26; F; F16; F16G; F16G1/00; F16G1/28; B32B5/02; B32B5/024; B32B7/00; B32B7/04; B32B7/12; B32B2255/00; B32B2255/26; B32B2305/00; B32B2305/08; B32B2307/00; B32B2307/40; B32B2307/402; B32B2307/4026; B32B2307/50; B32B2307/554; B32B2307/582; B32B2307/5825; B32B2413/00
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
85 words
A toothed belt comprising an elastomeric or plastic continuous band, a reinforcing structure embedded in said band, a toothing on at least one face of the band and a covering for the toothing, characterized in that said covering is constituted by at least two layers of fabric doubled together with a layer of elastomeric or plastic material interposed therebetween, whereby said covering is an extremely rigid layer which is substantially non-deformable by flexion stresses in comparison with the elastomeric or plastic material forming the toothing.
Claim 2
Dependent Claim
85 words
A toothed belt comprising an elastomeric or plastic continuous band, a reinforcing structure embedded in said band, a toothing on at least one face of the band and a covering for the toothing, characterized in that said covering is constituted by at least two layers of fabric doubled together with a layer of elastomeric or plastic material interposed therebetween, whereby said covering is an extremely rigid layer which is substantially non-deformable by flexion stresses in comparison with the elastomeric or plastic material forming the toothing.
Claim 3
Dependent Claim
33 words
A toothed belt as in claim 1, characterized in that the outer fabric is a fabric resistant to abrasion and the inner fabric is a fabric resistant to compression, tear and shearing stresses.
Claim 4
Dependent Claim
17 words
A toothed belt as in claim 2, characterized in that the outer fabric is a self-lubricating fabric.
Claim 5
Dependent Claim
70 words
A toothed belt as in claim 2, characterized in that the inner fabric is a square-woven fabric of high tenacity staple rayon having a count of 12/3, in which the warp has 180 threads per dm, a tensile strength of 240 kg/5 cm and an ultimate elongation of 40% and the weft has 140 threads per dm, a tensile strength of 220 kg/5 cm and an ultimate elongation of 20%.
Claim 6
Dependent Claim
22 words
A toothed blet as in claim 1, characterized in that the inner fabric is rubberized with a polychloroprene rubber containing an isocyanate.
Claim 7
Dependent Claim
42 words
A toothed belt as in claim 5, characterized in that the rubberizing of the layer of inner fabric is carried out with a solution comprising, in weight percentage of the solution, 75% of solvent, 15% of isocyanate and 10% of polychloroprene rubber.
Claim 8
Dependent Claim
16 words
A toothed belt as in claim 6, characterized in that the solvent is a toluene-base one.
Claim 9
Dependent Claim
40 words
A toothed belt as in claim 6, characterized in that the polychloroprene rubber has the following composition, expressed as a percentage by weight of the compound: Polychloroprene 45%
Zinc oxide 4.5%
Magnesium oxide 4.3%
Mineral oil 6.2%
Carbon black 40%.
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) | 1979-02-09 | 1979-08-11 | 1980-02-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-02-09 | 1983-08-11 | 1984-02-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-02-09 | 1987-08-11 | 1988-02-10 | $7700.00 | Window Closed / Lapsed |