Apparatus for producing a tube with successive corrugations of different radial extensions and spacings
US4267718A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 22, 1979 |
| Grant date | May 19, 1981 |
| Priority date | — |
| Expiry date | Jun 22, 1999 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB21D15/06
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
Apparatus for producing a tube with successive corrugations of different configuration from a tubular blank of uniform diameter mainly comprises a central pin having a shaft portion fixed only at one end to a stationary support and having at the other end a radially enlarged head portion cooperating with radially inwardly movable clamping and forming jaws to clamp a portion of a tubular blank therebetween. The apparatus includes further a tubular member guided on the shaft portion of the central pin and movable in axial direction by hydraulically operated members cooperating therewith. The tubular member supports the blank on the inner surface of the latter and cooperates with a plurality of clamping fingers arranged axially spaced from the head portion about the outer periphery of the blank and being movable by a hydraulically operated clamping piston between a clamping and a releasing position, whereby between the head portion, one end of the tubular member and the clamped portion of the blank an annular expansion space is formed into which fluid under pressure is fed, to cause outward bulging of the blank between the clamped portion thereof. The above-mentioned hydraulically ope…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.