GB1146721A - Method of forming field structure for magnetic loudspeaker - Google Patents
Method of forming field structure for magnetic loudspeakerInfo
- Publication number
- GB1146721A GB1146721A GB30009/66A GB3000966A GB1146721A GB 1146721 A GB1146721 A GB 1146721A GB 30009/66 A GB30009/66 A GB 30009/66A GB 3000966 A GB3000966 A GB 3000966A GB 1146721 A GB1146721 A GB 1146721A
- Authority
- GB
- United Kingdom
- Prior art keywords
- diameter
- workpiece
- forming
- lip
- housing
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
- B21D22/02—Stamping using rigid devices or tools
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D51/00—Making hollow objects
-
- 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
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Forging (AREA)
- Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
Abstract
1,146,721. Making loud-speakers, stamping. A. L. COEN. 4 July, 1966 [20 July, 1965], No. 30009/66. Headings B3A and B3Q. [Also in Division H4] A method of making a magnet housing for a transducer having a necked formation with a lip which surrounds an opening in one end of the body, comprises the steps of forming an open ended cup whose opening is of substantially the same diameter as its internal diameter, forming a neck to reduce the diameter of the opening and sizing the body and forming the lip. A disc or workpiece 71 is cut from a strip of metal by a die member 58, leaving edge portions 56, and is shaped by the member and punch 66. In the next step the workpiece is shaped to a smaller diameter and has a flat bottom. The workpiece is transferred to a press 92 and the open end is reduced in diameter by a lower die 96 having a tapered annular entrance 99 cooperating with an upper die 93 and a mandrel 102, Fig. 5. The final sizing is performed in a press 120, wherein a ring 127 coins a shoulder 24 on the housing and an upper die 122 froms the radius 136. The ring 127 may then be replaced by a die member 140 which forms a narrow lip 146 and further coins the shoulder 24. In a further embodiment, the bottom of the housing may be formed with a recess to receive the magnet of a loud-speaker, Fig. 11, (not shown). The methed may be performed progressively in a single press with several dies set up on a rotating table.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US473396A US3367165A (en) | 1965-07-20 | 1965-07-20 | Method for forming a field structure for magnetic loudspeaker |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1146721A true GB1146721A (en) | 1969-03-26 |
Family
ID=23879351
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB30009/66A Expired GB1146721A (en) | 1965-07-20 | 1966-07-04 | Method of forming field structure for magnetic loudspeaker |
Country Status (3)
| Country | Link |
|---|---|
| US (1) | US3367165A (en) |
| GB (1) | GB1146721A (en) |
| NL (1) | NL6610234A (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3732836A (en) * | 1971-09-17 | 1973-05-15 | Gen Motors Corp | Method of manufacturing drawn cup bearing races with crowned pathways |
| JPS5584238A (en) * | 1978-12-21 | 1980-06-25 | Sanden Corp | Production of magnetic circuit part of solenoid clutch |
| US4452062A (en) * | 1980-03-08 | 1984-06-05 | Ishizaki Press Kogyo Co., Ltd. | Method of manufacturing battery lid |
| US20070242849A1 (en) * | 2006-04-13 | 2007-10-18 | Galax Multimedia Co., Ltd. | Loudspeaker with high power efficiency and low resonance frequency |
| CN104056907A (en) * | 2014-06-27 | 2014-09-24 | 梧州恒声电子科技有限公司 | Processing method of horn basin stand |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1142782A (en) * | 1914-12-03 | 1915-06-08 | Rockwood Sprinkler Co | Set of dies. |
| US1427315A (en) * | 1919-09-10 | 1922-08-29 | Boston Pressed Metal Company | Method of forming an article of sheet metal |
| US1397360A (en) * | 1919-11-22 | 1921-11-15 | Rockwood Sprinkler Co | Method of making handles and the like |
| US2722047A (en) * | 1951-05-05 | 1955-11-01 | Walter F Cousino | Production of precision bushings |
| US3191421A (en) * | 1961-03-30 | 1965-06-29 | Aldo L Coen | Method of making loudspeaker field structure |
| US3138864A (en) * | 1961-05-25 | 1964-06-30 | Aldo L Coen | Method of working metal |
-
1965
- 1965-07-20 US US473396A patent/US3367165A/en not_active Expired - Lifetime
-
1966
- 1966-07-04 GB GB30009/66A patent/GB1146721A/en not_active Expired
- 1966-07-20 NL NL6610234A patent/NL6610234A/xx unknown
Also Published As
| Publication number | Publication date |
|---|---|
| US3367165A (en) | 1968-02-06 |
| NL6610234A (en) | 1967-01-23 |
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