Apparatus for compression molding recorded discs
US4362492A · kind A · utility
3Cited by
13References
9Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Oct 13, 1981 |
| Grant date | Dec 7, 1982 |
| Priority date | — |
| Expiry date | Oct 13, 2001 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S425/81
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
An apparatus for molding a recorded disc includes a pair of mold plates, at least one of which is movable toward and away from the other, and adapted to form a mold cavity therebetween, a center hold forming pin slidably mounted in one of the mold plates and a center plate in the other mold plate opposite the center hole forming pin. The center hole forming pin and/or the center plate includes a removable end plate at its surface which is harder than the rest of the center hole forming pin or center plate. The harder end plate has longer wear properties and can be easily and quickly replaced when it does become worn.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.