Patent US3973670A successfully refreshed from Google Patents.
US3973670A
Expired / Lapsed
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Conveyor belt
Assignee: Clouth Gummiwerke AG
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Filing: 1975-05-23
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Granted: 1976-08-10
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Expires: 1995-05-23
Abstract
Abstract A conveyor belt with continuous longitudinal reinforcement strands has a mechanical transverse barrier to prevent longitudinal ripping slitting or tearing. The mechanical transverse barrier is a fabric with warp and weft threads embedded in a cover layer of the conveyor belt. The longitudinally running threads have a substantially lower tensile strength than the transversely running threads, i.e. the tensile strength of the transverse threads is at least 8 times that of the longitudinal threads and preferably upwards of 20 (e.g. 30 to 50) times that of the longitudinal threads.
Inventors
- 👤 Hermann Spaar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 20:48
CPC Classifications
B; B65; B65G; B65G15/00; B65G15/30; B65G15/32; B65G15/34; B65G15/36; B65G2201/00; B65G2201/06
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
85 words
A conveyor belt comprising a flat body of flexible material; a multiplicity of longitudinally extending reinforcing strands embedded in said body and lying in at least one plane therein; and a longitudinal-tear barrier embedded in said body at least above said strands, said barrier comprising a fabric layer having interwoven threads running in the longitudinal direction of the belt and transversely thereof, the tensile strength of the transversely running threads being at least eight times greater than the tensile strength of the longitudinally running threads.
Claim 2
Dependent Claim
85 words
A conveyor belt comprising a flat body of flexible material; a multiplicity of longitudinally extending reinforcing strands embedded in said body and lying in at least one plane therein; and a longitudinal-tear barrier embedded in said body at least above said strands, said barrier comprising a fabric layer having interwoven threads running in the longitudinal direction of the belt and transversely thereof, the tensile strength of the transversely running threads being at least eight times greater than the tensile strength of the longitudinally running threads.
Claim 3
Dependent Claim
20 words
The conveyor belt defined in claim 1 wherein said longitudinally running threads have tensile strengths not greater than 7 kp.
Claim 4
Dependent Claim
31 words
The conveyor belt defined in claim 1 wherein the tensile strength of said transversely running threads is more than twenty times greater than the tensile strength of the longitudinally running threads.
Claim 5
Dependent Claim
31 words
The conveyor belt defined in claim 3 wherein the tensile strength of said transversely running threads is 30 to 50 times greater than the tensile strength of said longitudinally running threads.
Claim 6
Dependent Claim
29 words
The conveyor belt defined in claim 4 wherein the longitudinally running threads are spaced apart by a distance equal approximately to twice the spacing of said transversely running threads.
Claim 7
Dependent Claim
23 words
The conveyor belt defined in claim 5 wherein the transversely running threads are spaced apart by a distance of at least 5 mm.
Claim 8
Dependent Claim
37 words
The conveyor belt defined in claim 6 wherein the longitudinally running threads are spaced apart by a distance greater than their diameters and said transversely running threads are spaced apart by a distance greater than their diameters.
Claim 9
Dependent Claim
19 words
The conveyor belt defined in claim 7 wherein said fabric terminates inwardly of the lateral edges of said body.
Claim 10
Dependent Claim
30 words
The conveyor belt defined in claim 8 wherein said fabric is provided in a single layer directly above said strands, said strands lying in a single layer within said body.
Claim 11
Dependent Claim
19 words
The conveyor belt defined in claim 9 wherein said transversely running threads are composed of a polyamide synthetic resin.
References Cited (Backward Citations)
US2310819A
Cited
US2401260A
Cited
US2672168A
Cited
US2793150A
Cited
US3047446A
Cited
US3144930A
Cited
US3221869A
Cited
US3249128A
Cited
GB1240123A
Cited
DE1935266A1
Cited
US3900627A
Cited
US3756288A
Cited
US3863315A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-08-10 | 1980-02-09 | 1980-08-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-08-10 | 1984-02-09 | 1984-08-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-08-10 | 1988-02-09 | 1988-08-10 | $7700.00 | Window Closed / Lapsed |