US4053547A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for producing a positive drive belt
Assignee: Gates Corp
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Filing: 1973-06-21
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Granted: 1977-10-11
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Expires: 1993-06-21
Abstract
Abstract A method for casting cog-type power transmission belts from flowable elastomeric materials including the steps of forming a mold cavity defined by a mold mandrel and an outer mold shell, one of which has a plurality of axially disposed notches; wrapping preferably an extensible fabric about the surface of the notched mold portion; placing preferably fibrous loading members on the extensible fabric and superimposed over the axial notches; forcing the fibrous loading members and extensible fabric into the bottom contour of the notches; and introducing a substantial liquid elastomeric material into the mold cavity and polymerizing the elastomeric form in the mold to produce a sleeve containing one or more unitary endless cog-type belts.
Inventors
- 👤 John D. Redmond, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 05:13
CPC Classifications
B; B29; B29D; B29D29/00; B29D29/08; F; F16; F16G; F16G1/00; F16G1/28; F16G5/00; F16G5/20
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
133 words
A method for casting cog-type power transmission belts from flowable elastomeric material comprising the steps of: a. forming a mold cavity defined by a mold mandrel and an outer mold shell, one of said mandrel or shell having a plurality of notches therein disposed substantially parallel to the axis of the mold; b. wrapping an extensible fabric about the surface of the notched mold portion; c. placing loading members upon the extensible fabric and positioned opposite of and extending in the same direction as said notches; d. forcing said loading members and the extensible fabric ahead of the loading into the bottom contour of said notches; e. introducing a substantially liquid elastomeric material into said mold cavity; and f. polymerizing the resultant formed product to form one or more unitary endless belt members.
Claim 2
Independent Claim
133 words
A method for casting cog-type power transmission belts from flowable elastomeric material comprising the steps of: a. forming a mold cavity defined by a mold mandrel and an outer mold shell, one of said mandrel or shell having a plurality of notches therein disposed substantially parallel to the axis of the mold; b. wrapping an extensible fabric about the surface of the notched mold portion; c. placing loading members upon the extensible fabric and positioned opposite of and extending in the same direction as said notches; d. forcing said loading members and the extensible fabric ahead of the loading into the bottom contour of said notches; e. introducing a substantially liquid elastomeric material into said mold cavity; and f. polymerizing the resultant formed product to form one or more unitary endless belt members.
Claim 3
Dependent Claim
22 words
The method of claim 1 wherein said mold cavity is defined by an axially notched mold mandrel and an outer mold shell.
Claim 4
Dependent Claim
41 words
The method of claim 2 wherein the loading members and extensible fabric are forced into said notches of the mandrel by winding under tension a fibrous tensile layer about the mandrel and on top of and transverse to said loading members.
Claim 5
Dependent Claim
23 words
The method of claim 3 wherein the fibrous tensile layer comprises a cord spirally wound in a plurality of coils about the mandrel.
Claim 6
Dependent Claim
36 words
The method of claim 1 wherein said flowable elastomeric material is selected from the group consisting of plastisols, organosols, liquid chloroprene, liquid polysulfide, liquid rubbers, silicones, epoxides, carboxylated butadieneacrylonitrile, polyester based resins and polyether based resins.
Claim 7
Dependent Claim
12 words
The method of claim 1 wherein said flowable elastomeric material is polyurethane.
Claim 8
Dependent Claim
22 words
The method of claim 1 wherein the mold is made to rotate about an axis of rotation as the elastomer is introduced.
Claim 9
Dependent Claim
25 words
The method of claim 7 wherein a vacuum is applied to the mold cavity during rotation of the mold until the elastomer is fully introduced.
Claim 10
Dependent Claim
15 words
The method of claim 1 wherein said loading members are in the configuration of cords.
Claim 11
Dependent Claim
15 words
The method of claim 1 wherein said loading members are in the configuration of filaments.
Claim 12
Dependent Claim
16 words
The method of claim 1 wherein said loading members are in the configuration of twisted strands.
Claim 13
Dependent Claim
15 words
The method of claim 1 wherein said loading members are in the configuration of ropes.
Claim 14
Dependent Claim
15 words
The method of claim 1 wherein said loading members are in the configuration of tubes.
Claim 15
Dependent Claim
16 words
The method of claim 1 wherein said loading members are in the configuration of braided fibers.
Claim 16
Dependent Claim
15 words
The method of claim 1 wherein said loading members are in the configuration of rods.
Claim 17
Dependent Claim
41 words
The method of claim 1 wherein prior to introduction of said liquid elastomeric material into the mold cavity the following additional step in employed: impregnating said loading members with a composition which effects adherence between the loading member and elastomeric material.
Claim 18
Independent Claim
184 words
A method for casting positive drive power transmission belting from flowable elastomeric material comprising the steps of: forming a mold cavity defined by a mold mandrel and an outer mold shell, one of said mandrel or shell having a plurality of notches therein disposed substantially parallel to the axis of the mold; wrapping a fabric about the surface of the notched mold portion; locating loading members upon the fabric and positioned opposite of and extending in the same direction as said notches; wrapping a fibrous tensile layer upon the loading members and in a direction transverse to said loading members in a manner to force said loading members and the fabric ahead of the loading members into conformance with the bottom of the notches; said transverse members filling a major proportion of the distance between the fibrous tensile layer and the bottom of said notches; introducing a substantially liquid elastomeric material into said mold cavity; and polymerizing the resultant formed product to form a sleeve of belting from which one or more unitary endless belt members of the positive drive type may be severed.
Claim 19
Independent Claim
184 words
A method for casting positive drive power transmission belting from flowable elastomeric material comprising the steps of: forming a mold cavity defined by a mold mandrel and an outer mold shell, one of said mandrel or shell having a plurality of notches therein disposed substantially parallel to the axis of the mold; wrapping a fabric about the surface of the notched mold portion; locating loading members upon the fabric and positioned opposite of and extending in the same direction as said notches; wrapping a fibrous tensile layer upon the loading members and in a direction transverse to said loading members in a manner to force said loading members and the fabric ahead of the loading members into conformance with the bottom of the notches; said transverse members filling a major proportion of the distance between the fibrous tensile layer and the bottom of said notches; introducing a substantially liquid elastomeric material into said mold cavity; and polymerizing the resultant formed product to form a sleeve of belting from which one or more unitary endless belt members of the positive drive type may be severed.
Claim 20
Dependent Claim
15 words
The method of claim 17 wherein said loading members are in the configuration of cords.
Claim 21
Dependent Claim
17 words
The method of claim 18 wherein said notches accommodate substantially the entire cross-section of the cord members.
References Cited (Backward Citations)
GB744907A
Cited
US3482004A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-10-10 | 1981-04-11 | 1981-10-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-10-10 | 1985-04-11 | 1985-10-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-10-10 | 1989-04-11 | 1989-10-11 | $7700.00 | Window Closed / Lapsed |