US4184822A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for making power transmission belting
Assignee: Gates Corp
•
Filing: 1977-08-24
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Granted: 1980-01-22
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Expires: 1997-08-24
Abstract
Abstract The apparatus utilizes a mandrel in a substantially ring or cylindrical shape about which is disposed inwardly pressure supplying means, an annular cavity disposed between the mandrel and pressure means, and means for supplying heat to the mandrel to initiate its thermal growth during curing of the belting. The metal of the mandrel has a high coefficient of thermal expansion which during use applies radial outward pressure against the belt body being cured.
Inventors
- 👤 Nile L. Schwabauer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 09:14
CPC Classifications
B; B29; B29D; B29D29/00; B29D29/10; B29D29/08; Y; Y10; Y10S; Y10S425/00; Y10S425/019
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
156 words
Apparatus for curing an endless power transmission belt having at least one stable length tensile member embedded in a belt body, comprising: an inwardly disposed metal mandrel having an outer circumferentially continuous mold surface of cylindrical shape, said metal having a coefficient of thermal expansion of at least about 10×10 -6 per °F.; means disposed outwardly of the mandrel for supplying pressure in a direction toward the mandrel; said mandrel and pressure supplying means defining an annular cavity adapted to receive the belt body to be cured, the outer mold surface of the mandrel having an outside diameter at ambient, below curing temperature, that is slightly less than the inside diameter of the belt body to be cured; and means for supplying heat to the mandrel to cause the mandrel to expand outwardly to fully engage and press againt the belt body placing the stable length tensile member under tension during curing of the belt body.
Claim 2
Dependent Claim
156 words
Apparatus for curing an endless power transmission belt having at least one stable length tensile member embedded in a belt body, comprising: an inwardly disposed metal mandrel having an outer circumferentially continuous mold surface of cylindrical shape, said metal having a coefficient of thermal expansion of at least about 10×10 -6 per °F.; means disposed outwardly of the mandrel for supplying pressure in a direction toward the mandrel; said mandrel and pressure supplying means defining an annular cavity adapted to receive the belt body to be cured, the outer mold surface of the mandrel having an outside diameter at ambient, below curing temperature, that is slightly less than the inside diameter of the belt body to be cured; and means for supplying heat to the mandrel to cause the mandrel to expand outwardly to fully engage and press againt the belt body placing the stable length tensile member under tension during curing of the belt body.
Claim 3
Dependent Claim
26 words
The apparatus of claim 1 wherein said metal mandrel is hollow and has a coefficient of thermal expansion of at least about 13.5×10 -6 per °F.
Claim 4
Dependent Claim
19 words
The apparatus of claim 2 wherein said metal is selected from the group consisting of aluminum and its alloys.
Claim 5
Dependent Claim
19 words
The apparatus of claim 1 wherein said pressure means is an elastomeric bladder in association with a pressurizing chamber.
Claim 6
Dependent Claim
20 words
The apparatus of claim 4 wherein the bladder is an axially notched rubber cylinder formed of a single unitary member.
Claim 7
Dependent Claim
25 words
The apparatus of claim 1 wherein said heat supplying means is an autoclave provided with a steam source, in which the curing apparatus is contained.
Claim 8
Dependent Claim
50 words
The apparatus of claim 1 including in combination: means for withdrawing heat from the mandrel, such as a water quench supply, to cause the outer mold surface to contract and thereby be reduced in circumference and aid in assembly or disassembly of the belt body onto or from the mandrel.
Claim 9
Dependent Claim
23 words
The apparatus of claim 1 wherein said metal mandrel has a coefficient of thermal expansion of at least about 16×10 -6 per °F.
References Cited (Backward Citations)
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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) | 1983-01-21 | 1983-07-23 | 1984-01-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-01-21 | 1987-07-23 | 1988-01-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-01-21 | 1991-07-23 | 1992-01-22 | $7700.00 | Window Closed / Lapsed |