GB407999A - Improvements in or relating to permanent magnets - Google Patents

Improvements in or relating to permanent magnets

Info

Publication number
GB407999A
GB407999A GB2710732A GB2710732A GB407999A GB 407999 A GB407999 A GB 407999A GB 2710732 A GB2710732 A GB 2710732A GB 2710732 A GB2710732 A GB 2710732A GB 407999 A GB407999 A GB 407999A
Authority
GB
United Kingdom
Prior art keywords
piece
pole
secured
upper portion
magnet
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
Application number
GB2710732A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Swift Levick Magnets Ltd
Original Assignee
Swift Levick and Sons Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Swift Levick and Sons Ltd filed Critical Swift Levick and Sons Ltd
Priority to GB2710732A priority Critical patent/GB407999A/en
Publication of GB407999A publication Critical patent/GB407999A/en
Expired legal-status Critical Current

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
    • H04R9/025—Magnetic circuit
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2209/00—Details of transducers of the moving-coil, moving-strip, or moving-wire type covered by H04R9/00 but not provided for in any of its subgroups
    • H04R2209/024—Manufacturing aspects of the magnetic circuit of loudspeaker or microphone transducers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R31/00—Apparatus or processes specially adapted for the manufacture of transducers or diaphragms therefor
    • H04R31/006—Interconnection of transducer parts

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Magnetic Treatment Devices (AREA)
  • Percussion Or Vibration Massage (AREA)

Abstract

407,999. Sound reproducing and transmitting devices. SWIFT, LEVICK, & SONS, Ltd., and HORSBURGH, G. D. L., Clarence Steel Works, Sheffield. Sept. 29, 1932, No. 27107. [Class 40 (iv).] A magnet with a narrow air-gap, such as those employed in sound reproducing and transmitting apparatus consists of a body of magnet steel, in one or more pieces and having a base portion to which is secured a pole-piece and which is connected by loop-like limbs or claws to an upper portion having an opening surrounding the pole-piece, so that the magnet steel of the body comes up to the airgap. The Figure shows a section of such a magnet in which the body is in one piece, comprising the base portion 3, the limbs 4, 5 and the upper portion 6. The pole-piece 8 is secured to the body by a screw 9 and, to facilitate insertion the upper portion 10 is separate from the remainder and secured thereto by a screw. Alternatively, the lower portion may be formed by a separate washer. The upper portion 6 of the body may be formed of a separate plate of magnet steel secured to the limbs 4, 5. The pole-piece 8 may be of soft iron or may be constructed as described in Specification 407,998. Reference has been directed by the Comptroller to Specification 385,648.
GB2710732A 1932-09-29 1932-09-29 Improvements in or relating to permanent magnets Expired GB407999A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB2710732A GB407999A (en) 1932-09-29 1932-09-29 Improvements in or relating to permanent magnets

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2710732A GB407999A (en) 1932-09-29 1932-09-29 Improvements in or relating to permanent magnets

Publications (1)

Publication Number Publication Date
GB407999A true GB407999A (en) 1934-03-29

Family

ID=10254294

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2710732A Expired GB407999A (en) 1932-09-29 1932-09-29 Improvements in or relating to permanent magnets

Country Status (1)

Country Link
GB (1) GB407999A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2660468A (en) * 1949-07-28 1953-11-24 Cook Herbert Deep well fishing tool
DE1104633B (en) * 1955-05-16 1961-04-13 Boehler & Co Ag Geb Annular gap magnet system

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2660468A (en) * 1949-07-28 1953-11-24 Cook Herbert Deep well fishing tool
DE1104633B (en) * 1955-05-16 1961-04-13 Boehler & Co Ag Geb Annular gap magnet system

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