Apparatus for making corrugated flexible tubing
US3966379A · kind A · utility
3Cited by
10References
3Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Dec 12, 1973 |
| Grant date | Jun 29, 1976 |
| Priority date | — |
| Expiry date | Dec 12, 1993 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29C48/13
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
Apparatus for making corrugated flexible tubing such as the suction hose used in a vacuum cleaner comprises an extruder which extrudes tubular plastic material with annular corrugations, followed by a higher-speed haul-off device, a heater, a cooler, and a lower speed haul-off device, all placed to act on the corrugated tube as the latter is passing over a mandrel, so that the corrugations become compressed to a close-pitched condition by the speed differential of the haul-off devices, the condition being set by the action of the heater and cooler.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.