GB222239A - Improvements in or connected with telephone receivers - Google Patents
Improvements in or connected with telephone receiversInfo
- Publication number
- GB222239A GB222239A GB1762523A GB1762523A GB222239A GB 222239 A GB222239 A GB 222239A GB 1762523 A GB1762523 A GB 1762523A GB 1762523 A GB1762523 A GB 1762523A GB 222239 A GB222239 A GB 222239A
- Authority
- GB
- United Kingdom
- Prior art keywords
- feet
- secured
- magnet
- pole
- pieces
- 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
- H04R13/00—Transducers having an acoustic diaphragm of magnetisable material directly co-acting with electromagnet
- H04R13/02—Telephone receivers
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Magnetic Treatment Devices (AREA)
Abstract
222,239. Marr, A. July 7, 1923. Magnetic instruments.-In a telephone receiver, the polepieces 7, Figs. 2 and 3, tor permanent magnets of ring or horse-shoe type, are formed from blanks each comprising a narrow portion 8 and a lateral enlargement 9 which forms the vertical limbs to carry the winding. The portions 8 can be bent at any angle to the vertical plane to lie against the ends of the permanent magnet 10. The pole-pieces are clamped in position by a plate 11 secured to the casing by a screw 13, the ends of the plate being flanged to press the feet 8 against the ends of the magnet. In a modification, they are secured by a bow or other spring sprung into position between the feet. The permanent magnet may be secured in position by one or more grub screws or by a split ring. The terminals to which the conductors are connected may be arranged on a strip 17 of insulating material mounted across the magnet 10 or across the feet of the pole-pieces.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1762523A GB222239A (en) | 1923-07-07 | 1923-07-07 | Improvements in or connected with telephone receivers |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1762523A GB222239A (en) | 1923-07-07 | 1923-07-07 | Improvements in or connected with telephone receivers |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB222239A true GB222239A (en) | 1924-10-02 |
Family
ID=10098395
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1762523A Expired GB222239A (en) | 1923-07-07 | 1923-07-07 | Improvements in or connected with telephone receivers |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB222239A (en) |
-
1923
- 1923-07-07 GB GB1762523A patent/GB222239A/en not_active Expired
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