GB248176A - Improvements in and relating to loud speakers for wireless telephony and other purposes - Google Patents
Improvements in and relating to loud speakers for wireless telephony and other purposesInfo
- Publication number
- GB248176A GB248176A GB546825A GB546825A GB248176A GB 248176 A GB248176 A GB 248176A GB 546825 A GB546825 A GB 546825A GB 546825 A GB546825 A GB 546825A GB 248176 A GB248176 A GB 248176A
- Authority
- GB
- United Kingdom
- Prior art keywords
- armature
- casing
- diaphragm
- relating
- purposes
- 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
248,176. Grassmann, P. Feb. 27, 1925. Magnetic instruments.-The armature 6 of a loud speaker, pivoted on screws 7 at one side of the telephone casing 1 so as to lie above the pole-pieces 5 of magnets 3, is connected by a controlling member 18 to a diaphragm 19 in a sound box 2 mounted on the casing 1, the member 18 being pivotally mounted, so as to be forced to follow the vibrations of the armature in both directions, in a support 16 on the armature arranged eccentrically with respect to the centres of the armature and diaphragm. One end of the member 18 is connected to the centre of the diaphragm, whilst the other end is pivoted at 17 on the wall of the sound box. The distance of the armature from the pole piece is roughly adjusted by insertions 10, fine adjustment being effected by operation of the pin 9 upon which an extension 8 of the armature is adapted to rest. In the modification, Fig. 3, the telephone casing is formed in two parts 1, 1<1>, the armature 6 being arranged to oscillate between two magnets which are energized so as to be of opposite polarities. The extension 8 of the armature is secured to the adjusting pin 9, whilst the support 16<1> of the controlling member 18 passes through a hole in the top of the casing 1<1>.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEG63419D DE439410C (en) | 1925-02-10 | 1925-02-10 | Telephone-electrical sound box, consisting of a special speech machine sound box in connection with a telephone |
| GB546825A GB248176A (en) | 1925-02-27 | 1925-02-27 | Improvements in and relating to loud speakers for wireless telephony and other purposes |
| US17123A US1632287A (en) | 1925-02-10 | 1925-03-20 | Loud speaker for wireless telephony and other purposes |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB546825A GB248176A (en) | 1925-02-27 | 1925-02-27 | Improvements in and relating to loud speakers for wireless telephony and other purposes |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB248176A true GB248176A (en) | 1926-03-04 |
Family
ID=9796737
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB546825A Expired GB248176A (en) | 1925-02-10 | 1925-02-27 | Improvements in and relating to loud speakers for wireless telephony and other purposes |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB248176A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8295537B2 (en) | 2010-03-31 | 2012-10-23 | Bose Corporation | Loudspeaker moment and torque balancing |
| US8295536B2 (en) | 2010-03-31 | 2012-10-23 | Bose Corporation | Moving magnet levered loudspeaker |
| US9055370B2 (en) | 2012-08-31 | 2015-06-09 | Bose Corporation | Vibration-reducing passive radiators |
-
1925
- 1925-02-27 GB GB546825A patent/GB248176A/en not_active Expired
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8295537B2 (en) | 2010-03-31 | 2012-10-23 | Bose Corporation | Loudspeaker moment and torque balancing |
| US8295536B2 (en) | 2010-03-31 | 2012-10-23 | Bose Corporation | Moving magnet levered loudspeaker |
| US9055370B2 (en) | 2012-08-31 | 2015-06-09 | Bose Corporation | Vibration-reducing passive radiators |
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