Mold
US4726758A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 10, 1986 |
| Grant date | Feb 23, 1988 |
| Priority date | — |
| Expiry date | Oct 10, 2006 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29C45/1635
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A mold for stepwise molding by two or more injection shots of different materials or colors comprises fixed and movable mold halves and a slide core which combinedly form a first cavity and, with the slide core moved down, a second cavity for the shots to form a molded article of unitary structure, such as a housing section of an audio cassette tape with a see-through window. Ribs are formed on the slide core along its peripheries, and a land projection is formed on the inner side of the fixed mold half to be in contact with the molding surface of the slide core recessed with respect to the ribs. The inner peripheral wall faces of the ribs and the peripheral wall faces of the land projection of the fixed mold half are spaced apart to remain out of contact during mold clamping.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.