GB253486A - - Google Patents
Info
- Publication number
- GB253486A GB253486A GB9727/26A GB972726A GB253486A GB 253486 A GB253486 A GB 253486A GB 9727/26 A GB9727/26 A GB 9727/26A GB 972726 A GB972726 A GB 972726A GB 253486 A GB253486 A GB 253486A
- Authority
- GB
- United Kingdom
- Prior art keywords
- rim
- cone
- diaphragm
- hopkins
- radial
- 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
- H04R7/00—Diaphragms for electromechanical transducers; Cones
- H04R7/16—Mounting or tensioning of diaphragms or cones
- H04R7/18—Mounting or tensioning of diaphragms or cones at the periphery
- H04R7/20—Securing diaphragm or cone resiliently to support by flexible material, springs, cords, or strands
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Diaphragms For Electromechanical Transducers (AREA)
- Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
Abstract
253,486. Hopkins Corporation, (Assignees of Hopkins, M. C.). June 11, 1925, [Convention date]. Diaphragms; magnetic instruments; loudspeakers.-A loud-speaker has a large conical diaphragm, of stiff paper or the like, mounted under radial tension by a flexible rim which gives freedom for axial movement of the cone. As shown, a flat flexible rim is formed on the diaphragm 4 by cutting radial slots 4<a>, Figs. 11, and 12, in the periphery and bending the tabs so formed into a plane normal to the axis of the cone. This rim is cemented to a ring 8 in such a way that the cone is under radial tension and is free to vibrate substantially as a whole. Triangular portions 4b, Fig. 5, may be removed at the inner ends of the radial slits to increase the flexibility of the rim. The centre of the diaphragm is connected by a rod 19 to a vibratory reed 18 of an electromagnetic device forming the subject-matter of Specifications 253,080 and 253,487. This device is carried centrally by a metal spider 6. The whole apparatus is contained in a flat case comprising a rectangular frame 1 and front and back perforated covers 31, preferably of woven cane.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US36563A US1630011A (en) | 1925-06-11 | 1925-06-11 | Loud speaker |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB253486A true GB253486A (en) | 1927-07-13 |
Family
ID=21889291
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB9727/26A Expired GB253486A (en) | 1925-06-11 | 1926-04-13 |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US1630011A (en) |
| BE (1) | BE334368A (en) |
| DE (1) | DE509370C (en) |
| FR (1) | FR616419A (en) |
| GB (1) | GB253486A (en) |
| NL (1) | NL20912C (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6510919B1 (en) | 2000-08-30 | 2003-01-28 | Awi Licensing Company | Facing system for a flat panel radiator |
-
0
- BE BE334368D patent/BE334368A/xx unknown
- NL NL20912D patent/NL20912C/xx active
-
1925
- 1925-06-11 US US36563A patent/US1630011A/en not_active Expired - Lifetime
-
1926
- 1926-04-13 GB GB9727/26A patent/GB253486A/en not_active Expired
- 1926-05-20 FR FR616419D patent/FR616419A/en not_active Expired
- 1926-05-29 DE DEH106732D patent/DE509370C/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| FR616419A (en) | 1927-02-02 |
| US1630011A (en) | 1927-05-24 |
| BE334368A (en) | |
| NL20912C (en) | |
| DE509370C (en) | 1930-10-08 |
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