Acoustics – Anatomic or prosthetic relation – Ear and mouth
Patent
1979-04-02
1984-03-27
Brigance, Gerald L.
Acoustics
Anatomic or prosthetic relation
Ear and mouth
179146R, 181153, H04R 100
Patent
active
044396430
ABSTRACT:
A system of mounting electrical equipment, such as loud speakers, electrical clocks, radios and the like, in an enclosure which has a grill with flanges which telescope with complementary flanges on a mounting plate. The mounting plate may be secured to walls or ceilings by flush mounting or edge mounting brackets and may be secured in either a horizontal or vertical position. If an edge mounting bracket is used, the mounting plate is a plural center ring which receives telescoping cover plates from both sides to form a clamshell enclosure. Where flush mounting is used, such as on walls or ceilings, a single telescoping ring is used, which is mounted in the wall or ceiling, and the grill work and the complementary telescoping ring is attached thereto.
REFERENCES:
patent: 1661674 (1928-03-01), Osborn
patent: 2115098 (1938-04-01), Engholm
patent: 2141423 (1938-12-01), Tolerton
patent: 3443660 (1969-05-01), Virva et al.
patent: 4072829 (1978-02-01), Ogihara
patent: 4123621 (1978-10-01), Walker
patent: 4152544 (1979-05-01), Sanpei et al.
patent: 4179009 (1979-12-01), Birkner
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