Device for producing hollow molded members
US4219317A · kind A · utility
1Cited by
3References
4Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jun 8, 1979 |
| Grant date | Aug 26, 1980 |
| Priority date | — |
| Expiry date | Jun 8, 1999 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29L2030/00
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
Production of hollow shaped bodies made of pourable and hardenable material, particularly polyurethane tires, in a mold cavity having a deformable membrane. The membrane is expanded to fill the mold cavity and expel air therein. Thereafter an amount of material required to produce the shaped body is introduced into the mold cavity and concomitantly the membrane is contracted to the form of the core. This minimizes air bubbles in the shaped body. A piston-cylinder unit movable with the inflow and outflow of liquid to the deformable membrane may be used to accurately control feed of polyurethane material to the mold cavity.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.