Injection-molding tool for the production of disc-shaped...

Details Injection-molding tool for the production of disc-shaped... Injection-molding tool for the production of disc-shaped...

2007-05-08

2007-05-08

Heckenberg, Donald (Department: 1722)

Plastic article or earthenware shaping or treating: apparatus

Female mold and charger to supply fluent stock under...

C425S810000, C264S001330

Reexamination Certificate

active

11320344

ABSTRACT:
An injection molding tool is described for the production of disc-like information carriers, in particular in the form of CD's and/or DVD's. The injection molding tool has a first and a second mirror block which form the cavity and which are located opposite to each other and which, for allowing an opening and a closure of the cavity, are movable relative to each other. In addition to that it has a form ring which encloses the first mirror block concentrically, and which borders the cavity towards its outer edge, and which is movable relative to the first mirror block, wherein between the first mirror block and the form ring enclosing it a sliding ring is provided for the reduction of friction if the form ring moves relative to the first mirror block. Optimal in respect of the reduction of friction of the motion and without problems in view of maintenance such an injection molding tool can be improved if the sliding ring is concentrically located between the first mirror block and the form ring enclosing it, as well as in addition to that at least one additional bearing located concentrically between the first mirror block and the form ring enclosing it, in particular in the form of a cage ball bearing.

REFERENCES:
patent: 5018962 (1991-05-01), Kitamura et al.
patent: 2002/0031570 (2002-03-01), Gabriel
patent: 44 10 015 (1994-10-01), None
patent: 0 899 075 (1999-03-01), None
patent: 1 120 221 (2000-09-01), None
patent: 2000-048416 (2000-02-01), None
patent: WO 99/37471 (1999-07-01), None

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