US3910098A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mandrel for shaping pipes
Assignee: Pneumatiques Caoutchouc Manufacture et Plastiques Kleber Colombes SA
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Filing: 1974-10-17
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Granted: 1975-10-07
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Expires: 1994-10-17
Abstract
Abstract An expansible mandrel for shaping large-diameter metal pipes used, for example, to convey petroleum products which includes the combination of an expansible central tube having a rubber wall braced with at least one pair of layers comprising metal wires or cables crossed from one layer to the other and inclined at an angle under 55* and preferably comprised between 10* and 45* to the longitudinal axis of the tube and a cylindrical thick rubber sleeve arranged around the tube, said sleeve being externally covered with flexible longitudinal plates adhering to the rubber of the sleeve.
Inventors
- 👤 Franck Tailhardat
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 20:06
CPC Classifications
B; B21; B21D; B21D9/00; Y; Y10; Y10T; Y10T279/00; Y10T279/10; Y10T279/1021; Y10T279/1024; Y10T279/1029
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
128 words
An expansible mandrel for curving into the desired shape large-diameter metal pipes which are used, for example, to convey petroleum products comprising a central expansible tube having a rubber wall braced with at least one pair of layers comprising metal cables crossed from one layer to the other and inclined at an angle of about 10* to 45* with the longitudinal axis of the tube and a thick cylindrical rubber sleeve externally covered with flexible longitudinal extending plates adhering to the rubber of the sleeve arranged around said tube, said sleeve also comprises at least one pair of reinforcing layers comprising metal cables oriented in cross directions and forming a slightly smaller angle than the angle of the cable in the inner bracing layers of the expansible tube.
Claim 2
Dependent Claim
128 words
An expansible mandrel for curving into the desired shape large-diameter metal pipes which are used, for example, to convey petroleum products comprising a central expansible tube having a rubber wall braced with at least one pair of layers comprising metal cables crossed from one layer to the other and inclined at an angle of about 10* to 45* with the longitudinal axis of the tube and a thick cylindrical rubber sleeve externally covered with flexible longitudinal extending plates adhering to the rubber of the sleeve arranged around said tube, said sleeve also comprises at least one pair of reinforcing layers comprising metal cables oriented in cross directions and forming a slightly smaller angle than the angle of the cable in the inner bracing layers of the expansible tube.
Claim 3
Dependent Claim
58 words
The mandrel of claim 1, wherein the metal cables in the bracing layers of the expansible tube are inclined at an angle of 30* to 50* with respect to the longitudinal axis and the metal cables in the reinforcing layers of the sleeve are inclined at an angle of 25* to 40* with respect to the longitudinal axis.
Claim 4
Dependent Claim
28 words
The mandrel of claim 1, wherein the reinforcing layers of the sleeve are spaced apart from each other and from the outer and inner surfaces of the mandrel.
Claim 5
Dependent Claim
18 words
The mandrel of claim 1, wherein the rubber sleeve is connected to the expansible tube and integral therewith.
Claim 6
Dependent Claim
48 words
The mandrel of claim 1, wherein the ends of the inner bracing layers of the expansible tube are spread out in a radial direction and gripped axially between two elements fitting one into the other of an annular end clamp to which a pressure-resistant metal base is attached.
Claim 7
Dependent Claim
48 words
The mandrel of claim 5, wherein an additional partial layer consisting of metal cables is connected to the ends of the bracing layers of the expansible tube, all the layers of metal cables in said tube being gripped between the elements of the end clamp of the mandrel.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-10-06 | 1979-04-07 | 1979-10-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-10-06 | 1983-04-07 | 1983-10-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-10-06 | 1987-04-07 | 1987-10-07 | $7700.00 | Window Closed / Lapsed |