GB389898A - Improvements in or relating to permanent magnets - Google Patents
Improvements in or relating to permanent magnetsInfo
- Publication number
- GB389898A GB389898A GB3040431A GB3040431A GB389898A GB 389898 A GB389898 A GB 389898A GB 3040431 A GB3040431 A GB 3040431A GB 3040431 A GB3040431 A GB 3040431A GB 389898 A GB389898 A GB 389898A
- Authority
- GB
- United Kingdom
- Prior art keywords
- ring
- polepiece
- dust
- sealing material
- moving
- 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
- H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
- H04R9/02—Details
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Current-Collector Devices For Electrically Propelled Vehicles (AREA)
Abstract
389,898. Light-current relays. DARWINS, Ltd. and BROWN, W., Fitzwilliam Works, Templeborough, Sheffield. Nov. 3, 1931, No. 30404. [Class 38 (v).] In a moving-coil relay or the like, a dust ring 18, Fig. 1, of non-magnetic material, is a sliding fit on the central polepiece 10 and is pressed, as by the spring 21, into contact with a surface of the outer polepiece 16, so preventing ingress of dust into the air gap 17. The dust ring may be provided with sealing material 26, Fig. 3. Alternatively the ring may be grooved to receive rings of sealing material, Fig. 2 (not shown). The ring may be formed of elastic material, e.g. rubber, which is held by being compressed between the outer polepiece and an abutment on the central polepiece, Fig. 4 (not shown). The axial length and internal diameter of the ring are great enough to avoid the moving coil touching it during operation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB3040431A GB389898A (en) | 1931-11-03 | 1931-11-03 | Improvements in or relating to permanent magnets |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB3040431A GB389898A (en) | 1931-11-03 | 1931-11-03 | Improvements in or relating to permanent magnets |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB389898A true GB389898A (en) | 1933-03-30 |
Family
ID=10307154
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB3040431A Expired GB389898A (en) | 1931-11-03 | 1931-11-03 | Improvements in or relating to permanent magnets |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB389898A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2501031A (en) * | 1945-11-30 | 1950-03-21 | Rca Corp | Magnetic field structure for dynamic loud-speakers and the like |
| US2501032A (en) * | 1945-11-30 | 1950-03-21 | Rca Corp | Permanent magnet assembly for electrodynamic loud-speakers |
| US2524780A (en) * | 1945-07-07 | 1950-10-10 | Rola Company Inc | Pole piece centering arrangement for permanent magnet electrodynamic loudspeakers |
| US3222753A (en) * | 1959-05-18 | 1965-12-14 | Heppner Mfg Co | Speaker magnet structure and method of forming the same |
| GB2238289A (en) * | 1989-11-24 | 1991-05-29 | Roy Stuart Kellett | A ramp |
-
1931
- 1931-11-03 GB GB3040431A patent/GB389898A/en not_active Expired
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2524780A (en) * | 1945-07-07 | 1950-10-10 | Rola Company Inc | Pole piece centering arrangement for permanent magnet electrodynamic loudspeakers |
| US2501031A (en) * | 1945-11-30 | 1950-03-21 | Rca Corp | Magnetic field structure for dynamic loud-speakers and the like |
| US2501032A (en) * | 1945-11-30 | 1950-03-21 | Rca Corp | Permanent magnet assembly for electrodynamic loud-speakers |
| US3222753A (en) * | 1959-05-18 | 1965-12-14 | Heppner Mfg Co | Speaker magnet structure and method of forming the same |
| GB2238289A (en) * | 1989-11-24 | 1991-05-29 | Roy Stuart Kellett | A ramp |
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