Acoustics – Anatomic or prosthetic relation – Ear and mouth
Patent
1990-08-17
1991-09-10
Brown, Brian W.
Acoustics
Anatomic or prosthetic relation
Ear and mouth
381 686, 381 687, 128866, A61B 702
Patent
active
050465805
ABSTRACT:
An ear plug assembly (28) for behind the ear hearing aids. The ear plug assembly (28) comprises a hollow substantially conical shell (32) having two annular ridges (42, 44) in its smaller open end (34). A hollow tube (26) connects the electronics package (20) to the smaller end (34) of the shell (32) and conveys the sound into the ear canal. One end of the tube (26) has a fitting or endpiece (50) in it with a flange (52) that is seated between the ridges thus securing the tube (26) in the shell. A slidable nut (38) and a spring (40) are mounted on the tube (26) such that the nut can be slid toward the endpiece (50) thus compressing the spring (40) and providing rigidity. The compressed spring (40) transmits a force applied to the nut (38) to act upon the endpiece (50) and the ridge (44) of the shell (32). This force tends to stretch the shell (32), reducing its diameter so that easier and deeper insertion into the ear canal can be achieved. When the force is removed from the nut (38), the shell (32) tends to return to its noraml size i.e. its larger diameter, and hence achieves a snug and comfortable fit with the interior of the ear canal of the wearer.
REFERENCES:
patent: 1279396 (1918-09-01), Michelson
patent: 3732382 (1973-05-01), DeWitt
patent: 4539440 (1985-09-01), Sciarra
Brown Brian W.
Brown Charles D.
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