Method for molding a speaker grille
AssigneeNifco Inc.
InventorKazumasa Kurihara
Life of this patent
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Abstract
In a speaker grille formed of a synthetic resin, including a grille plate having a plurality of through holes and a frame integrally formed with the grille plate so as to surround the outer periphery of the grille plate, a ring-shaped groove is formed between the grille plate and the frame so as to extend along the inner periphery of the frame. In molding the speaker grille, the flow of the resin is blocked by a ring-shaped dam provided in a metal mold to form the ring-shaped groove. Accordingly, the speaker grille can be beautifully molded without the generation of appearance defects such as flow mark, weld, and short. Further, in forming through holes also at the boundary between the grille plate and the frame, there is no problem in strength of the metal mold.
Claims2
In a molding method for a speaker grille formed of a synthetic resin, said speaker grille comprising;
- a grille plate having a plurality of through holes and a frame integrally formed with said grille plate to surround an outer periphery of said grille plate, said speaker grille being molded by charging said synthetic resin into a metal mold having a cavity provided with a grille plate forming portion having a plurality of pins for forming said through holes and also provided with a frame forming portion around said grille plate forming portion;
- a ring-shaped dam for blocking flow of said molding resin in said metal mold is provided at a boundary between said grille plate forming portion and said frame forming portion of said cavity to surround said pins.
Dependencies are inferred from the claim text.