Apparatus for molding a plastic pipe
US4239474A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 29, 1979 |
| Grant date | Dec 16, 1980 |
| Priority date | — |
| Expiry date | Jun 29, 1999 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29C49/42452
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A lower mold half is horizontally placed. The top surface of the lower mold half is provided with a first groove of any desired shape, one end of which is closed with the other end having a notch for allowing air to be blown in. An upper mold half has a bottom surface which matches with the top surface of the lower mold half and which is provided with a second groove corresponding to said first groove. Thus, when the upper and lower mold halves are in contact, there is formed a mold cavity defined by the first and second grooves. A nozzle for discharging a parison is disposed above the lower mold half. The relative positional relation between the nozzle and the lower mold half is changed in such a manner that the nozzle follows the first groove without changing the distance therefrom so that a parison can be properly placed in the first groove. If at least two lower mold halves are provided, it is possible to carry out molding operation continuously.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.