US140539A - Improvement in speaking-tubes - Google Patents
Improvement in speaking-tubes Download PDFInfo
- Publication number
- US140539A US140539A US140539DA US140539A US 140539 A US140539 A US 140539A US 140539D A US140539D A US 140539DA US 140539 A US140539 A US 140539A
- Authority
- US
- United States
- Prior art keywords
- speaking
- tubes
- improvement
- lid
- disks
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 210000002832 Shoulder Anatomy 0.000 description 4
- 229910001018 Cast iron Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000000717 retained Effects 0.000 description 2
- 230000013707 sensory perception of sound Effects 0.000 description 2
Images
Classifications
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/18—Methods or devices for transmitting, conducting or directing sound
- G10K11/22—Methods or devices for transmitting, conducting or directing sound for conducting sound through hollow pipes, e.g. speaking tubes
Definitions
- hinged to the case A is preferably of castiron, and is concave or recessed at the inner or rear side where there are two annular shoulders or hearings, on w, for disks m a of thin metal, the former being cup-shaped, and both having central openings on a line with the central opening q of the lid.
- the disks are of such a size that, when pressed to their seats, they will be retained, by friction against the ledges of the lid, in their places-the trouble and expense of first making independent whistles and then securing them to the lid being avoided, as the disks and lid together constitute the whistle.
Description
A. RAN KIN.
Speaking-Tubes.
Patented July 1; 1873.
JYIELE.
AM PHOTOiITMDGRAPH/c ca Mnossamsmacaw.)
UNITED STATES PATENT QFFICE.
ANDREW RANKIN, OF PHILADELPHIA, PENNSYLVANIA.
IMPROVEMENT IN SPEAKING-TUBES.
Specification forming part of Letters Patent No. 140,539, dated July 1, 1873; application filed February 27, 1873.
hinged to the case A, is preferably of castiron, and is concave or recessed at the inner or rear side where there are two annular shoulders or hearings, on w, for disks m a of thin metal, the former being cup-shaped, and both having central openings on a line with the central opening q of the lid.
The disks are of such a size that, when pressed to their seats, they will be retained, by friction against the ledges of the lid, in their places-the trouble and expense of first making independent whistles and then securing them to the lid being avoided, as the disks and lid together constitute the whistle.
I clain1 The combination, in aniouth-piece for speaking-tubes, of the recessed lid B, its shoulders .00 02, opening q, and the perforated plates m n, all constructed and arranged as set forth.
In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.
ANDREW RANKIN. lVitnesses:
WM. A. STEEL, HUBERT HoWsoN.
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US140539A true US140539A (en) | 1873-07-01 |
Family
ID=2209953
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US140539D Expired - Lifetime US140539A (en) | Improvement in speaking-tubes |
Country Status (1)
| Country | Link |
|---|---|
| US (1) | US140539A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20050208239A1 (en) * | 2004-03-18 | 2005-09-22 | 3M Innovative Properties Company | Flexible article comprising pocket |
-
0
- US US140539D patent/US140539A/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20050208239A1 (en) * | 2004-03-18 | 2005-09-22 | 3M Innovative Properties Company | Flexible article comprising pocket |
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