Patent US4796187A successfully refreshed from Google Patents.
US3835720A
Expired / Lapsed
US
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Endless power transmission belt and method of making same
Assignee: Dayco Products LLC
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Filing: 1973-08-10
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Granted: 1974-09-17
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Expires: 1993-08-10
Abstract
Abstract An endless power transmission belt and method of making same is provided wherein such belt is adapted to be operated in an endless path and comprises a tension section, a load-carrying section, and a compression section having a plurality of teeth arranged transverse the endless path with each of the teeth having a plurality of parallel randomly dispersed strength members each extending completely across its associated tooth with the randomly dispersed members increasing the transverse rigidity of the belt as well as providing nonsymmetrical patterns for the strength members which tend to prevent the development of shear planes and thereby prevent premature belt failure.
Inventors
- 👤 D Fisher
- 👤 J Hill
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 22:41
CPC Classifications
F; F16; F16G; F16G1/00; F16G1/28; B; B29; B29D; B29D29/00; B29D29/08; B29D29/10; B29D29/106; F16G5/00; F16G5/20
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
91 words
An endless power transmission belt adapted to be operated in an endless path and comprising, a tension section, a loadcarryiNg section, and a compression section having a plurality of teeth arranged transverse said endless path, each of said teeth having a plurality of parallel randomly dispersed strength members each extending completely across its associated tooth, said randomly dispersed members increasing the transverse rigidity of said belt as well as providing nonsymmetrical patterns for said strength members which tend to prevent the development of shear planes and thereby prevent premature belt failure.
Claim 2
Dependent Claim
91 words
An endless power transmission belt adapted to be operated in an endless path and comprising, a tension section, a loadcarryiNg section, and a compression section having a plurality of teeth arranged transverse said endless path, each of said teeth having a plurality of parallel randomly dispersed strength members each extending completely across its associated tooth, said randomly dispersed members increasing the transverse rigidity of said belt as well as providing nonsymmetrical patterns for said strength members which tend to prevent the development of shear planes and thereby prevent premature belt failure.
Claim 3
Dependent Claim
22 words
A belt as set forth in claim 1 in which each of said strength members is made of a substantially inextensible cord.
Claim 4
Dependent Claim
19 words
A belt as set forth in claim 1 and further comprising a top cover bonded against said tension section.
Claim 5
Dependent Claim
44 words
A belt as set forth in claim 2 in which each of said teeth when viewed on a cross-sectional plane parallel to the running plane of the belt has said strength members therein which define between 15 and 95% of the cross-sectional area thereof.
Claim 6
Dependent Claim
43 words
A belt as set forth in claim 2 in which each of said teeth when viewed on a cross-sectional plane parallel to the running plane of the belt has said strength members which define between 20 to 40% of the cross-sectional area thereof.
Claim 7
Dependent Claim
21 words
A belt as set forth in claim 1 in which said sections of said belt are made primarily of elastomeric material.
Claim 8
Dependent Claim
37 words
A belt as set forth in claim 1 in which said teeth have broken tie strands therein extending transverse the strength members, said broken tie strands allowing said strength members to move to their randomly dispersed positions.
Claim 9
Dependent Claim
14 words
A belt as set forth in claim 4 having a substantially trapezoidal cross-sectional configuration.
Claim 10
Dependent Claim
21 words
A belt as set forth in claim 1 in which said load-carrying section comprises a substantially inextensible helically wound load-carrying cord.
Claim 11
Dependent Claim
16 words
A belt as set forth in claim 9 in which each tooth has an arcuate apex.
Claim 12
Independent Claim
221 words
A method of making endless power transmission belts comprising the steps of, providing a sheet of tire cord fabric having strength members and transversely arranged weak tie strands loosely holding said strength members in spaced relation and having an elastomeric material defining at least one surface of said sheet, placing said sheet around a cylindrical forming member having alternating longitudinally extending parallel projections and grooves with said strength members arranged substantially parallel to said projections and with said elastomeric material against said forming member, winding a load-carrying material around said sheet, wrapping a layer of elastomeric material around said load-carrying material, curing the assembly of materials placed around said forming member, said winding and curing steps serving to urge said sheet against said forming member so that it substantially fills said grooves while said elastomeric material of said sheet serves as a matrix allowing floating movement of said strength members within said grooves in a random manner while breaking some of the tie strands to thereby form teeth in said sheet having said strength members randomly dispersed in each tooth, and cutting the cured assembly of materials to define a plurality of said endless belts each having a plurality of transverse teeth with each tooth having a plurality of parallel randomly dispersed strength members each extending completely across its associated tooth.
Claim 13
Independent Claim
221 words
A method of making endless power transmission belts comprising the steps of, providing a sheet of tire cord fabric having strength members and transversely arranged weak tie strands loosely holding said strength members in spaced relation and having an elastomeric material defining at least one surface of said sheet, placing said sheet around a cylindrical forming member having alternating longitudinally extending parallel projections and grooves with said strength members arranged substantially parallel to said projections and with said elastomeric material against said forming member, winding a load-carrying material around said sheet, wrapping a layer of elastomeric material around said load-carrying material, curing the assembly of materials placed around said forming member, said winding and curing steps serving to urge said sheet against said forming member so that it substantially fills said grooves while said elastomeric material of said sheet serves as a matrix allowing floating movement of said strength members within said grooves in a random manner while breaking some of the tie strands to thereby form teeth in said sheet having said strength members randomly dispersed in each tooth, and cutting the cured assembly of materials to define a plurality of said endless belts each having a plurality of transverse teeth with each tooth having a plurality of parallel randomly dispersed strength members each extending completely across its associated tooth.
Claim 14
Dependent Claim
37 words
A method as set forth in claim 11 in which said providing step comprises providing said sheet having a plurality of parallel layers of said tire cord fabric held together as a unit by said elastomeric material.
Claim 15
Dependent Claim
26 words
A method as set forth in claim 12 in which each of said layers of tire cord fabric has said elastomeric material defining opposed surfaces thereof.
Claim 16
Dependent Claim
26 words
A method as set forth in claim 11 in which said winding step comprises winding said load-carrying material in the form of a load-carrying endless cord.
Claim 17
Dependent Claim
54 words
A method as set forth in claim 14 in which said winding step comprises winding said load-carrying cord in a helical pattern against said sheet, said cord being substantially inextensible and being made of a material which shrinks in length during said curing step and thereby helps urge said sheet against said forming member.
Claim 18
Dependent Claim
44 words
A method as set forth in claim 14 and including the further steps of wrapping a bottom cushion made of an elastomeric material against said sheet prior to said winding step and said winding step comprises winding said load-carrying material against said bottom cushion.
Claim 19
Dependent Claim
80 words
A method as set forth in claim 16 and including the further steps of wrapping a top cushion made of an elastomeric material against said load-carrying cord prior to said step of wrapping said layer of elastomeric material, and said step of wrapping said layer of elastomeric material comprises wrapping said layer of elastomeric material against said top cushion, said top and bottom cushions cooperating with said load-carrying cord to define a load-carrying section for each of said endless belts.
Claim 20
Dependent Claim
28 words
A method as set forth in claim 17 and comprising the further step of applying a cover material against said layer of elastomeric material after wrapping step thereof.
Claim 21
Dependent Claim
59 words
A method as set forth in claim 11 in which said providing step comprises providing said sheet of tire cord fabric having said strength members which during said winding and curing steps move within said grooves and form said teeth, said strength members being such that they define between 15 and 95% of the volume of their associated teeth.
Claim 22
Dependent Claim
57 words
A method as set forth in claim 11 in which said providing step comprises providing said sheet of tire cord fabric having said strength members which during said winding and curing steps move within said grooves and form said teeth, said strength members being such that they define roughly 30% of the volume of their associated teeth.
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) | 1977-09-16 | 1978-03-18 | 1978-09-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-16 | 1982-03-18 | 1982-09-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-16 | 1986-03-18 | 1986-09-17 | $7700.00 | Window Closed / Lapsed |