Plastic tumbler and method and apparatus for making same
US4277435A · kind A · utility
6Cited by
8References
5Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Mar 28, 1979 |
| Grant date | Jul 7, 1981 |
| Priority date | — |
| Expiry date | Mar 28, 1999 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29C45/345
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A tumbler is formed of injected plastic material that has different directional strengths by injecting the plastic material somewhat tangentially to cause the plastic material to move peripherally in the rim defining portion of the mold cavity in order to have the weaker directional strength also extend peripherally to thereby increase the tumbler's resistance to lengthwise splitting from the rim to the bottom and in which the mold is vented into a cooling passageway.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.