US3850222A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Recapping large tires
Assignee: Compagnie Generale des Etablissements Michelin SCA
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Filing: 1972-07-25
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Granted: 1974-11-26
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Expires: 1992-07-25
Abstract
Abstract A tool for cutting grooves in a tire tread includes a transformer having a primary and a secondary and means for supplying the primary with current of low voltage at a frequency between 50 and 1,000 hertz, and preferably between 200 and 500 hertz. At least a portion of the secondary is formed as a blade having a shape corresponding to the profile of the grooves to be cut. Drive means including a hydrualic jack is provided for hauling the tool blade through the tread to cut the grooves. The tool facilitates recapping large tires.
Inventors
- 👤 D Lejuene
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 12:17
CPC Classifications
B; B29; B29D; B29D30/00; B29D30/06; B29D30/52; B29D30/68; Y; Y10; Y10T; Y10T83/00; Y10T83/283; Y10T83/293
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
208 words
A tool for cutting grooves in a tire tread, comprising a transformer having a primary and secondary, means for supplying the primary with current of low voltage at a frequency between 50 and 1,000 hertz, at least a portion of the secondary being formed as a blade having a shape corresponding to the profile of the grooves to be cut, further comprising drive means for hauling the tool to enable the blade to cut grooves in the tire tread, wherein the drive means comprises a hydraulic jack having a first part connected to and movable with the tool and a second part movable with respect to the first part, and means for anchoring the second part, whereby relative movement of the two parts displaces the tool, and wherein the means for anchoring the second part of the jack comprises a traction cable, means connecting one end of the traction cable to said second part of the jack, a fixed support having a plurality of points of attachment, and means connecting the other end of said traction cablE to said fixed support at a selected one of said points of attachment, the selection of the point of attachment being variable in dependence on the desired direction of the cut.
Claim 2
Dependent Claim
208 words
A tool for cutting grooves in a tire tread, comprising a transformer having a primary and secondary, means for supplying the primary with current of low voltage at a frequency between 50 and 1,000 hertz, at least a portion of the secondary being formed as a blade having a shape corresponding to the profile of the grooves to be cut, further comprising drive means for hauling the tool to enable the blade to cut grooves in the tire tread, wherein the drive means comprises a hydraulic jack having a first part connected to and movable with the tool and a second part movable with respect to the first part, and means for anchoring the second part, whereby relative movement of the two parts displaces the tool, and wherein the means for anchoring the second part of the jack comprises a traction cable, means connecting one end of the traction cable to said second part of the jack, a fixed support having a plurality of points of attachment, and means connecting the other end of said traction cablE to said fixed support at a selected one of said points of attachment, the selection of the point of attachment being variable in dependence on the desired direction of the cut.
Claim 3
Dependent Claim
135 words
A tool for cutting grooves in a tire tread comprising a transformer having a primary and a secondary, the secondary comprising a blade heatable by electric current flowing through the transformer and having a rubber-penetrating portion of a shape that corresponds to the profile of the grooves to be cut, and temperature-control means comprising two thermometer means, one of the thermometer means being mounted to measure the temperature of the rubber-penetrating portion of the blade and the other thermometer means being mounted to measure the temperature of a portion of the blade spaced apart from the rubber-penetrating portion, the first thermometer means facilitating control of the flow of electric current through the transformer, and the second thermometer means facilitating control of a cooling fluid blown on the transformer and on the tire near the blade.
Claim 4
Dependent Claim
135 words
A tool for cutting grooves in a tire tread comprising a transformer having a primary and a secondary, the secondary comprising a blade heatable by electric current flowing through the transformer and having a rubber-penetrating portion of a shape that corresponds to the profile of the grooves to be cut, and temperature-control means comprising two thermometer means, one of the thermometer means being mounted to measure the temperature of the rubber-penetrating portion of the blade and the other thermometer means being mounted to measure the temperature of a portion of the blade spaced apart from the rubber-penetrating portion, the first thermometer means facilitating control of the flow of electric current through the transformer, and the second thermometer means facilitating control of a cooling fluid blown on the transformer and on the tire near the blade.
Claim 5
Dependent Claim
32 words
A tool according to claim 2 in which the primary of the transformer is constructed to pass alternating current of a frequency substantially within the range of 50 hertz to 1,000 hertz.
Claim 6
Dependent Claim
32 words
A tool according to claim 2 in which the primary of the transformer is constructed to pass alternating current of a frequency substantially within the range of 200 hertz to 500 hertz.
Claim 7
Dependent Claim
25 words
A tool according to claim 2 further comprising drive means for hauling the tool to enable the blade to cut grooves in the tire tread.
Claim 8
Dependent Claim
49 words
A tool according to claim 2 wherein the blade is maintained at a cutting temperature substantially within the range of 100*C to 200*C, further comprising drive means for hauling the tool at a cutting speed substantially within the range of 0.2 meters per minute to 2 meters per minute.
Claim 9
Dependent Claim
53 words
A tool according to claim 6 wherein the drive means comprises a hydraulic jack having a first part connected to and movable with the tool and a second part movable with respect to the first part, and means for anchoring the second part, whereby relative movement of the two parts displaces the tool.
Claim 10
Dependent Claim
17 words
A tool according to claim 2 further comprising balancing means compensating for the weight of the tool.
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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) | 1977-11-25 | 1978-05-27 | 1978-11-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-25 | 1982-05-27 | 1982-11-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-25 | 1986-05-27 | 1986-11-26 | $7700.00 | Window Closed / Lapsed |