GB199678A - Improvements in telephone receivers and similar sound producing devices - Google Patents
Improvements in telephone receivers and similar sound producing devicesInfo
- Publication number
- GB199678A GB199678A GB2652/23A GB265223A GB199678A GB 199678 A GB199678 A GB 199678A GB 2652/23 A GB2652/23 A GB 2652/23A GB 265223 A GB265223 A GB 265223A GB 199678 A GB199678 A GB 199678A
- Authority
- GB
- United Kingdom
- Prior art keywords
- pole pieces
- moulded
- magnet
- magnetic
- screws
- 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
Abstract
199,678. British Thomson - Houston Co., Ltd., and You.ng, A. P. May 20, 1922. Magnetic i n s t r uments.-A portion or the whole of the magnetic circuit of a telephone receiver is embedded in an insulating material such as plastic rubber or synthetic resin which is moulded to form the body of the receiver. In one form laminated pole pieces 1, Fig. 2, are moulded in insulating material so as to form a casing 2 of that material, a recess 7 being moulded on one side in which h a straight bar magnet 8, preferably of cobalt steel, is afterwards inserted and held against the pole pieces by a wedge 9. The coils 11 are then placed on the pole pieces and their terminals secured to terminal pieces 19 held by screws 18 in a recess moulded for the purpose. A slot may be provided for holding a second permanent magnet on the opposite side of the pole pieces to the magnet 8. In a modification, Fig. 5, the bar magnet 8 is in the same plane as the pole pieces 1 and its ends are shaped as shown to engage with the ends of the pole pieces. In further modifications, a straight bar magnet may be secured by screws to the pole pieces, or the magnet may be of horseshoe form with reduced ends to form pole pieces. The pole pieces in each case may consist of a cut away rectangular portion or straight or slightly tapering cylindrical pole pieces may be used. A flat portion 27 of the pole pieces forms a seat for the coils. Projecting portions of the pole pieces may be provided approaching each other to form a shunt path for the magnetic flux. In all modifications, the casing is provided with a screw thread 13 on which screws a cap to clamp the diaphragm. Where the pole pieces are laminated the laminations may be held together by rivets or by leaving holes into which the insulating material flows. According to one Provisional Specification, cylindrical coils with a conicallyshaped aperture may fit on conical cores, and according to another Provisional Specification, the moulded casing may be of non-magnetic metal such as brass or aluminium. Another Provisional Specification states that the magnetic circuit of a receiver in which voice currents pass through a coil movable in a magnetic field is formed from a central cylindrical core having a number of outwardly directed limbs against which are located the like poles of short bar magnets. The annular space between the magnets and the central core may be filled with an annular block of say aluminium or brass or synthetic resin may be cast in the annular space and around the outside of the bar magnets.
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB2652/23A GB199678A (en) | 1922-05-20 | 1922-05-20 | Improvements in telephone receivers and similar sound producing devices |
US640060A US1593377A (en) | 1922-05-20 | 1923-05-19 | Telephone receiver and similar sound-producing device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB2652/23A GB199678A (en) | 1922-05-20 | 1922-05-20 | Improvements in telephone receivers and similar sound producing devices |
Publications (1)
Publication Number | Publication Date |
---|---|
GB199678A true GB199678A (en) | 1923-06-28 |
Family
ID=9743337
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB2652/23A Expired GB199678A (en) | 1922-05-20 | 1922-05-20 | Improvements in telephone receivers and similar sound producing devices |
Country Status (2)
Country | Link |
---|---|
US (1) | US1593377A (en) |
GB (1) | GB199678A (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2496483A (en) * | 1945-07-23 | 1950-02-07 | Massa Frank | Loud-speaker with diaphragm an integral part of outer casing |
JPS5653438Y2 (en) * | 1977-01-11 | 1981-12-12 |
-
1922
- 1922-05-20 GB GB2652/23A patent/GB199678A/en not_active Expired
-
1923
- 1923-05-19 US US640060A patent/US1593377A/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
US1593377A (en) | 1926-07-20 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US1927346A (en) | Electromagnetic device | |
US1901443A (en) | Signaling device | |
GB199678A (en) | Improvements in telephone receivers and similar sound producing devices | |
GB212648A (en) | Improvements in sound emitting apparatus, such as telephone receivers | |
US2051475A (en) | Relay | |
US1630380A (en) | Loud-speaker unit | |
FR2056159A5 (en) | ||
US1581509A (en) | bungerz | |
US1763172A (en) | Electro-polarized relay | |
US1350594A (en) | Telephone receiver | |
US1598722A (en) | Telephone receiver | |
US1778401A (en) | Relay | |
US1612086A (en) | Sound-reproducing apparatus | |
US1780349A (en) | Apparatus for radiating sound waves | |
US746979A (en) | Party-line bell. | |
GB267243A (en) | Improvements in magnetic vibratory devices | |
US1181710A (en) | Telephone-receiver. | |
GB510382A (en) | Improvements relating to magnetos | |
US1547343A (en) | Receiver | |
GB214787A (en) | Improvements in or relating to telephone receivers | |
US598269A (en) | Polarized signal-bell | |
US1118926A (en) | Telephone-system receiver. | |
GB240528A (en) | Telephone receiver | |
GB554056A (en) | Improvements in or relating to telephone ringers | |
GB263484A (en) | Loud speaker |