Speaker box manufacturing method

Details Speaker box manufacturing method Speaker box manufacturing method

1979-05-30

1981-01-13

Moon, Charlie T.

Metal working

Method of mechanical manufacture

Assembling or joining

291695, 29453, 181199, 264249, B23P 1100

Patent

active

042440963

ABSTRACT:
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.

REFERENCES:
patent: 2343037 (1944-02-01), Adelman
patent: 2407090 (1946-09-01), McMahan
patent: 2505175 (1950-04-01), Davis
patent: 2705346 (1955-04-01), Schlabach et al.
patent: 2840181 (1958-06-01), Wildman
patent: 3019854 (1962-02-01), O'Bryant
patent: 3484515 (1969-12-01), Linda et al.
patent: 3941638 (1976-03-01), Horky et al.
patent: 3971877 (1976-07-01), Lee
patent: 3980555 (1976-09-01), Freissle
patent: 4126923 (1978-11-01), Cislak

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