US4409588A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Miniature sounder with multi-part tuned cavities
Assignee: Pickering and Co Inc
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Filing: 1981-03-10
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Granted: 1983-10-11
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Expires: 2001-03-10
Abstract
Abstract A miniature sounder having a diaphragm closing one end of a tuned chamber. The other end of the chamber communicates with the interior of a tuned housing through which an open-ended enclosure extends. The oscillating frequency of the diaphragm. The housing and enclosure are tuned to resonate at the desired frequency.
Inventors
- 👤 Alan Hofer
- 👤 Frank M. Yama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 03:10
CPC Classifications
G; G10; G10K; G10K11/00; G10K11/08; G08; G08B; G08B3/00; G10K9/00; G10K9/12; G10K9/13
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
123 words
A miniature sounder comprising: a diaphragm; a surrounding housing disposed about said diaphragm; an open-ended chamber dimensioned to resonate at a predetermined frequency positioned within said housing, said chamber having a first portion including a first open end closed by said diaphragm and a second portion including an opposite open end communicating with the interior of said housing; an armature affixed to said diaphragm; a magnetic circuit operatively connected to said armature for driving said diaphragm at a desired frequency; and, an open-ended enclosure positioned within said housing providing an outlet from said sounder; said open-ended chamber having a volume tuned to a subharmonic of said desired frequency and said open-ended enclosure and housing having a combined volume tuned to said desired frequency.
Claim 2
Dependent Claim
123 words
A miniature sounder comprising: a diaphragm; a surrounding housing disposed about said diaphragm; an open-ended chamber dimensioned to resonate at a predetermined frequency positioned within said housing, said chamber having a first portion including a first open end closed by said diaphragm and a second portion including an opposite open end communicating with the interior of said housing; an armature affixed to said diaphragm; a magnetic circuit operatively connected to said armature for driving said diaphragm at a desired frequency; and, an open-ended enclosure positioned within said housing providing an outlet from said sounder; said open-ended chamber having a volume tuned to a subharmonic of said desired frequency and said open-ended enclosure and housing having a combined volume tuned to said desired frequency.
Claim 3
Dependent Claim
21 words
The miniature sounder in accordance with claim 1 wherein said chamber has a resonant frequency substantially three times said desired frequency.
Claim 4
Dependent Claim
16 words
The miniature sounder in accordance with claim 1 or 2 wherein said enclosure comprises a tube.
Claim 5
Dependent Claim
44 words
The miniature sounder in accordance with claim 1 wherein said diaphragm frequency comprises approximately 2070 Hz, said chamber is tuned to a resonant frequency of approximately 6200 Hz, and said housing and enclosure combined are tuned to a resonant frequency of approximately 2070 Hz.
Claim 6
Dependent Claim
13 words
The miniature sounder in accordance with claim 1 wherein said housing is cubical.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-10-10 | 1987-04-11 | 1987-10-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-10-10 | 1991-04-11 | 1991-10-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-10-10 | 1995-04-11 | 1995-10-11 | $7700.00 | Window Closed / Lapsed |