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US 4,244,096 AGranted
Speaker box manufacturing method
AssigneeKyowa Denki Kagaku Kabushiki Kaisha
InventorHirota Kashichi
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AssigneeKyowa Denki Kagaku Kabushiki Kaisha
InventorHirota Kashichi
Estimating the term…
A thermoplastic front frame having many small protrusions on the whole front face and many thorn-like sharp projections on the whole rear face. The frame is strongly forced onto a cloth with the front face of the frame being directed downwardly, so that the front protrusions cut into the cloth so as to temporarily secure the cloth to the frame. Thereafter, the peripheral portion of the cloth extending outside of the frame is folded upwardly and then further folded inwardly and pierced by the rear projections thereby being temporarily secured. Then, a heated iron is forced onto the rear projections to depress the head portions of the rear projections to cause the projection to make the head of each projection larger than the mesh of the cloth whereby the cloth is permanently secured to the frame. Then, the cloth covered frame so formed is integrally attached to the speaker box.
A method of manufacturing a speaker box comprising the steps of preparing thermoplastic front frame having many protrusions formed on a substantially whole front face thereof and many thorn-like projections formed on a substantially whole rear face thereof;
A cloth covered front panel for use in a speaker box comprising a front frame having many protrusions formed on a substantially whole front face thereof and a cloth covering said front face of said front frame and secured to said front frame by forcing said front frame onto said cloth with said front face of said front frame being directed to said cloth so that said front protrusions cut into said cloth so as to temporarily secure said cloth to the front frame;
Dependencies are inferred from the claim text.