US4752282A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flat drive belt
Assignee: Habasit AG
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Filing: 1986-03-20
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Granted: 1988-06-21
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Expires: 2006-03-20
Abstract
Abstract The flat drive belt has a layered build-up comprising at least one tensile layer (1) which has a modulus of elasticity of 20,000-250,000 N/mm 2 and which is positively embedded between two thermoplastic hot-melt films (3) having a modulus of elasticity of 40-600 N/mm 2 . Friction layers or friction structures (4) of an elastomer material having a modulus of elasticity of 2-40 N/mm 2 are built up on the hot-melt films (3). The individual layers of the flat drive belt can be produced with high precision and, as a composite, form a sheet-like structure which is very regular with respect to thickness and weight per unit area. The starting material, produced as meter ware, for the flat drive belt can be cut without effort by the user from rolls and can be joined under the action of pressure and heat into a continuous form, without thickenings and joint gaps, in the way required for the kinematic behavior of fast-running drive belts.
Inventors
- 👤 Fernand Habegger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 20:48
CPC Classifications
F; F16; F16G; F16G1/00; F16G1/14; F16G1/16; F16G3/00; F16G3/10; Y; Y10; Y10T; Y10T442/00; Y10T442/30; Y10T442/3008; Y10T442/3016
Claims Analysis
Total Claims: 31
Claim 1
Independent Claim
226 words
A method of making a flat multi-ply drive belt, comprising the steps of: providing a fabric formed from warp fibers extending in a generally longitudinal direction and having a modulus of elasticity in a range of from about 20,000 N/mm 2 to about 250,000 N/mm 2 , said warp fibers being made from a material having a first melting point, and weft fibers extending in a generally transverse direction, said weft fibers being made from a material having a second melting point which is lower than said first melting point; positioning said fabric between a first layer of thermoplastic material and a second layer of thermoplastic material, the thermoplastic material of said first and second layers having a third melting point which is lower than said second melting point, whereby a multi-ply assembly is formed; and subjecting said multi-ply assembly to temperature and pressure conditions selected such that said weft fibers are non-releasably bonded to said first and second layers, whereby said multi-ply assembly is transformed into an integral sheet-like structure, and such that said warp fibers are not bonded to said first and second layers or to said weft fibers, whereby said warp fibers form a tensile layer whose flexibility is enhanced by reason of the nonbonding of said warp fibers to said weft fibers and to said first and second layers of thermoplastic material.
Claim 2
Independent Claim
226 words
A method of making a flat multi-ply drive belt, comprising the steps of: providing a fabric formed from warp fibers extending in a generally longitudinal direction and having a modulus of elasticity in a range of from about 20,000 N/mm 2 to about 250,000 N/mm 2 , said warp fibers being made from a material having a first melting point, and weft fibers extending in a generally transverse direction, said weft fibers being made from a material having a second melting point which is lower than said first melting point; positioning said fabric between a first layer of thermoplastic material and a second layer of thermoplastic material, the thermoplastic material of said first and second layers having a third melting point which is lower than said second melting point, whereby a multi-ply assembly is formed; and subjecting said multi-ply assembly to temperature and pressure conditions selected such that said weft fibers are non-releasably bonded to said first and second layers, whereby said multi-ply assembly is transformed into an integral sheet-like structure, and such that said warp fibers are not bonded to said first and second layers or to said weft fibers, whereby said warp fibers form a tensile layer whose flexibility is enhanced by reason of the nonbonding of said warp fibers to said weft fibers and to said first and second layers of thermoplastic material.
Claim 3
Dependent Claim
26 words
The method of claim 1, wherein the longitudinal warp fibers are comprised of aramide fibers, carbon fibers, glass fibers, steel wire, polyvinylalcohol fibers, or mixtures thereof.
Claim 4
Dependent Claim
26 words
The method of claim 2, wherein the longitudinal warp fibers comprise aramide fibers having a modulus of elasticity of about 70,000 to 140,000 N/mm 2 .
Claim 5
Dependent Claim
19 words
The method of claim 1, wherein the longitudinal warp fibers have a melting point above about 230 degrees C.
Claim 6
Dependent Claim
17 words
The method of claim 1, wherein the weft fibers are made from polyester fibers and/or polyamide fibers.
Claim 7
Dependent Claim
22 words
The method of claim 1, wherein the thermoplastic material has a modulus of elasticity of about 40 to 600 N/mm 2 .
Claim 8
Dependent Claim
20 words
The method of claim 1, wherein the thermoplastic material has a melting point of about 140 to 180 degrees C.
Claim 9
Dependent Claim
22 words
The method of claim 7, wherein the hot pressing step is performed at a temperature of about 140 to 180 degrees C.
Claim 10
Dependent Claim
34 words
The method of claim 1, wherein the belt contains a friction layer on at least one outside surface and the friction layer comprises a thermoplastic material with friction-enhancing properties produced therein by surface structuring.
Claim 11
Dependent Claim
46 words
The method of claim 1, wherein the belt contains a friction layer on at least one outside surface and the friction layer comprises a material which is different from the thermoplastic material and which is added to said outside surface prior to said hot pressing step.
Claim 12
Dependent Claim
23 words
The method of claim 10, wherein the friction layer material has a modulus of elasticity of about 2 to 40 N/mm 2 .
Claim 13
Dependent Claim
13 words
The method of claim 10, wherein the friction layer material comprises an elastomer.
Claim 14
Dependent Claim
18 words
The method of claim 10, wherein there are two friction layers on opposite outside surfaces of the belt.
Claim 15
Dependent Claim
24 words
The method of claim 1, wherein there are two or more tensile layers, adjacent tensile layers being separated by a layer of thermoplastic material.
Claim 16
Dependent Claim
14 words
The method of claim 1, wherein the layers of thermoplastic material have antistatic properties.
Claim 17
Dependent Claim
197 words
A flat multi-ply drive belt, comprising a fabric formed from warp fibers extending in a generally longitudinal direction and having a modulus of elasticity in a range of from about 20,000 N/mm 2 to about 250,000 N/mm 2 , said warp fibers being made from a material having a first melting point, and weft fibers extending in a generally transverse direction, said weft fibers being made from a material having a second melting point which is lower than said first melting point; a first layer of thermoplastic material positioned on one side of said fabric; and a second layer of thermoplastic material positioned on an opposite side of said fabric, the thermoplastic material of said first and second layers having a third melting point which is lower than said second melting point such that said first and second layers of thermoplastic material are non-releasably bonded by the application of heat and pressure to said weft fibers but not to said warp fibers, whereby said warp fibers form a tensile layer whose flexibility is enhanced by reason of the nonbonding of said warp fibers to said weft fibers and to said first and second layers of thermoplastic material.
Claim 18
Dependent Claim
197 words
A flat multi-ply drive belt, comprising a fabric formed from warp fibers extending in a generally longitudinal direction and having a modulus of elasticity in a range of from about 20,000 N/mm 2 to about 250,000 N/mm 2 , said warp fibers being made from a material having a first melting point, and weft fibers extending in a generally transverse direction, said weft fibers being made from a material having a second melting point which is lower than said first melting point; a first layer of thermoplastic material positioned on one side of said fabric; and a second layer of thermoplastic material positioned on an opposite side of said fabric, the thermoplastic material of said first and second layers having a third melting point which is lower than said second melting point such that said first and second layers of thermoplastic material are non-releasably bonded by the application of heat and pressure to said weft fibers but not to said warp fibers, whereby said warp fibers form a tensile layer whose flexibility is enhanced by reason of the nonbonding of said warp fibers to said weft fibers and to said first and second layers of thermoplastic material.
Claim 19
Dependent Claim
27 words
The drive belt of claim 16, wherein the longitudinal warp fibers are comprised of aramide fibers, carbon fibers, glass fibers, steel wire, polyvinylalcohol fibers, or mixtures thereof.
Claim 20
Dependent Claim
27 words
The drive belt of claim 17, wherein the longitudinal warp fibers comprise aramide fibers having a modulus of elasticity of about 70,000 to 140,000 N/mm 2 .
Claim 21
Dependent Claim
20 words
The drive belt of claim 16, wherein the longitudinal warp fibers have a melting point above about 230 degrees C.
Claim 22
Dependent Claim
18 words
The drive belt of claim 16, wherein the weft fibers are made from polyester fibers and/or polyamide fibers.
Claim 23
Dependent Claim
23 words
The drive belt of claim 16, wherein the thermoplastic material has a modulus of elasticity of about 40 to 600 N/mm 2 .
Claim 24
Dependent Claim
21 words
The drive belt of claim 16, wherein the thermoplastic material has a melting point of about 140 to 180 degrees C.
Claim 25
Dependent Claim
35 words
The drive belt of claim 16, wherein the belt contains a friction layer on at least one outside surface and the friction layer comprises a thermoplastic material with friction-enhancing properties produced therein by surface structuring.
Claim 26
Dependent Claim
33 words
The drive belt of claim 16, wherein the belt contains a friction layer on at least one outside surface and the friction layer comprises a material which is different from the thermoplastic material.
Claim 27
Dependent Claim
24 words
The drive belt of claim 24, wherein the friction layer material has a modulus of elasticity of about 2 to 40 N/mm 2 .
Claim 28
Dependent Claim
14 words
The drive belt of claim 24, wherein the friction layer material comprises an elastomer.
Claim 29
Dependent Claim
19 words
The drive belt of claim 24, wherein there are two friction layers on opposite outside surfaces of the belt.
Claim 30
Dependent Claim
25 words
The drive belt of claim 16, wherein there are two or more tensile layers, adjacent tensile layers being separated by a layer of thermoplastic material.
Claim 31
Dependent Claim
15 words
The drive belt of claim 16, wherein the layers of thermoplastic material have antistatic properties.
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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) | 1991-06-21 | 1991-12-21 | 1992-06-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-06-21 | 1995-12-21 | 1996-06-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-06-21 | 1999-12-21 | 2000-06-21 | $7700.00 | Window Closed / Lapsed |