Patent US3761558A successfully refreshed from Google Patents.
US3761558A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vee belt manufacture
Assignee: Individual
•
Filing: 1971-06-08
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Granted: 1973-09-25
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Expires: 1991-06-08
Abstract
Abstract A method of treating a conventional vee-belt (having a polyester reinforcement) to stabilize the belt at a required nominal length includes the steps of pre-vulcanizing the otherwise completed belt on a heating drum around which the vee-belt is passed without tension being applied. The belt is prepared for vulcanization under tension so as to eliminate shrinkage caused by the pre-vulcanization step and bring the belt back to its original length. Subsequently the belt is stretched over two rollers under a standard load and when the required length is achieved, is given a permanent set by immediate cooling.
Inventors
- 👤 J Hnatek
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 19:05
CPC Classifications
B; B29; B29D; B29D29/00; B29D29/10; Y; Y10; Y10S; Y10S264/00; Y10S264/59
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
108 words
In a method for bringing an initially partially, thermally-vulcanized vee-belt to its desired length, said vee-belt including a tensile member of polyester material which contracts elastically with increasing temperature, the steps of further thermally-vulcanizing the partially-vulcanized belt while tensioned for a time sufficient to coMpensate for the contraction caused by the initial partial thermal-vulcanization, and immediately placing the hot belt under a tension caused by a load sufficient to prevent its contraction due to cooling and cause a slow expansion of the belt while still hot in order to stretch the belt to bring it to its desired, length, and cooling the belt to give a permanent set.
Claim 2
Dependent Claim
18 words
A method according to claim 1, wherein the vulcanization in the unstretched conditon takes place at 150* C.
Claim 3
Dependent Claim
200 words
In a method for producing a plurality of Vee-belts of uniform length, each belt including a tensile member of elastically-contractile polyester produced as a condensation product from the reaction of ethylene glycol and a substance selected from terephthalic acid and derivatives thereof and which has been formed into a textile filament, each filament being liable to contract on heating, embedded in a vehicle tire rubber mix, the improvement comprising the steps of subjecting each said Vee-belt to an initial thermal vulcanization while the belts are in motion around spaced pulleys and substantially free of tension, subjecting each said Vee-belt to further thermal vulcanization while the belts are in motion around spaced pullys and under a tension such that on completion of the further vulcanization the contraction produced by the initial vulcanization has been offset, immediately thereafter placing each hot belt under a load for its dimensions which is sufficient to prevent contraction from the effects of cooling and allow a slow expansion of each belt while still hot, stretching each belt by an amount to bring it to the precise length which is desired, and immediately cooling the belts to room temperature to stabilize them at the said desired length.
Claim 4
Independent Claim
194 words
A method of forming a plurality of vee-belts of uniform length, each belt composed of rubber material which encases a tensile member of elastically-contractile polyester material having the physical characteristic of contracting on heating, the method comprising the steps of: Subjecting said belts to a first thermal vulcanizing cycle in an unstressed conditon whereby said rubber material of each belt is vulcanized with its tensile member located therein in its desired position and each said belt shrinks to less than its original length from the contraction of its tensile member; Subjecting said belts to a second thermal vulcanizing cycle while applying sufficient tensile force thereto whereby said belts attain their original length in this second cycle; While said belts are still hot, rotating same under a tension sufficient to prevent their contraction while cooling and cause slow expansion of the belts while still hot, and at the same time continually measuring the length of said belts; and When said belts attain their original length, cooling said belts while continuing to rotate same; whereby each said belt has a permanent length within a tolerance of not greater than 0.067 percent variance of its original length.
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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) | 1976-09-24 | 1977-03-26 | 1977-09-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-24 | 1981-03-26 | 1981-09-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-24 | 1985-03-26 | 1985-09-25 | $7700.00 | Window Closed / Lapsed |