Acoustics – Anatomic or prosthetic relation – Ear and mouth
Patent
1987-05-13
1988-09-13
Fuller, B. R.
Acoustics
Anatomic or prosthetic relation
Ear and mouth
181131, H04R 2500
Patent
active
047702702
ABSTRACT:
A stethoscope chestpiece has a body member, a tubular shaft, and an indexing detent. The body has a plurality of microphones each of which has a opening at its apex and a central recess. The tubular shaft is rotably secured within the central recess and has an opening in its wall that aligns selectively with one of the openings from the microphones. The sound conveying detent is mounted transversely within the shaft and aligned with the opening in the shaft wall. The indexing detent has a hollow cylindrical element and spring. The hollow cylindrical element has an open bottom and a seat end having an opening. The seat end is beveled and extends beyond the opening in the shaft wall to engage the body. When the seat end is aligned with a selected one of the openings from the microphones it seats to hold the opening from the microphone in alignment with the opening in the seat end to create a sound passageway into the tubular shaft.
REFERENCES:
patent: 3124211 (1964-03-01), Cefaly
patent: 3152659 (1964-10-01), Littmann
patent: 3224526 (1965-12-01), Weber
patent: 3316998 (1967-05-01), Krug
patent: 4212368 (1980-07-01), Allen
patent: 4239089 (1980-12-01), Nelson
Fuller B. R.
Hulse Dale E.
Minnesota Mining and Manufacturing Company
Sell Donald M.
Smith James A.
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