GB208330A - Improvements in telephone apparatus - Google Patents
Improvements in telephone apparatusInfo
- Publication number
- GB208330A GB208330A GB30493/22A GB3049322A GB208330A GB 208330 A GB208330 A GB 208330A GB 30493/22 A GB30493/22 A GB 30493/22A GB 3049322 A GB3049322 A GB 3049322A GB 208330 A GB208330 A GB 208330A
- Authority
- GB
- United Kingdom
- Prior art keywords
- armature
- pole
- rod
- portions
- shoes
- 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
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R11/00—Transducers of moving-armature or moving-core type
Abstract
208,330. Schmidt, L. Nov. 7, 1922. Magnetic instruments.- The armature of a magnetic telephone instrument moves about a fulcrum within the bore of the coil. The armature, Fig. 5, consists of two cylindrical parts 17, 18 having tapered portions 19, of which one has a threaded stud 20 which screws into the other. Split sleeves 22, having ring portions 24 which receive the stud 20, fit tightly into the bore of the coil 14, Fig. 2, and the portions 24 form the pivot for the armature. Pole-pieces 6, 7 are secured to the limbs of a horse-shoe magnet 5, and pole-shoes 11, 12 project inwardly therefrom. The inner faces of the pole-shoes are concave and eccentric with respect to the armature. A rod 29 extends loosely through an opening 2 in the end of the armature with its head resting in the groove 28, Fig. 5, and is attached to a mica diaphragm 31, Fig. 2. This ensures that the rod is always perpendicular to the diaphragm. A split sleeve 30<1> fits over the reduced end of the armature so as to ensure a pivoted action of the rod 29. The instrument may be used either as a transmitter or receiver.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US57086922 US1452850A (en) | 1922-06-26 | 1922-06-26 | of brooklyn |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB208330A true GB208330A (en) | 1923-12-20 |
Family
ID=10308531
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB30493/22A Expired GB208330A (en) | 1922-06-26 | 1922-11-07 | Improvements in telephone apparatus |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US1452850A (en) |
| CH (1) | CH104444A (en) |
| DE (1) | DE399753C (en) |
| FR (1) | FR558788A (en) |
| GB (1) | GB208330A (en) |
| NL (1) | NL13437C (en) |
-
1922
- 1922-06-26 US US57086922 patent/US1452850A/en not_active Expired - Lifetime
- 1922-10-07 DE DESCH66063D patent/DE399753C/en not_active Expired
- 1922-11-07 GB GB30493/22A patent/GB208330A/en not_active Expired
- 1922-11-14 NL NL23204A patent/NL13437C/xx active
- 1922-11-15 CH CH104444D patent/CH104444A/en unknown
- 1922-11-17 FR FR558788D patent/FR558788A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| CH104444A (en) | 1924-05-01 |
| NL13437C (en) | 1925-08-15 |
| US1452850A (en) | 1923-04-24 |
| DE399753C (en) | 1924-07-29 |
| FR558788A (en) | 1923-09-03 |
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