GB440038A - Improvements relating to permanent magnets - Google Patents

Improvements relating to permanent magnets

Info

Publication number
GB440038A
GB440038A GB1809734A GB1809734A GB440038A GB 440038 A GB440038 A GB 440038A GB 1809734 A GB1809734 A GB 1809734A GB 1809734 A GB1809734 A GB 1809734A GB 440038 A GB440038 A GB 440038A
Authority
GB
United Kingdom
Prior art keywords
magnet
guard
aluminium
short
nonmagnetic material
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
GB1809734A
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.)
ZF International UK Ltd
Original Assignee
Joseph Lucas 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 Joseph Lucas Ltd filed Critical Joseph Lucas Ltd
Priority to GB1809734A priority Critical patent/GB440038A/en
Priority to FR791283D priority patent/FR791283A/en
Publication of GB440038A publication Critical patent/GB440038A/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

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Toys (AREA)
  • Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)

Abstract

440,038. Magnets. LUCAS, Ltd., J., and WATSON, E. -A., Great King Street, Birmingham. June 19, 1934, No. 18097. [Class 35] [See also Group XXXIX] A short, stumpy, permanent magnet, that is, one which is short in comparison to its width, made from a high coercivity alloy of the nickel, aluminium and iron type, has combined with one or more of its sides a guard of nonmagnetic material. The object of the guard is to avoid demagnetization by contact of the magnet with any iron body. As shown in connection with a loudspeaker, the magnet a has a jacket b of paper, synthetic resin, brass, aluminium or other nonmagnetic material. Alternatively, the guard may consist of a shell separated from the magnet by an air space or of rings, studs, ribs, or flanges.
GB1809734A 1934-06-19 1934-06-19 Improvements relating to permanent magnets Expired GB440038A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB1809734A GB440038A (en) 1934-06-19 1934-06-19 Improvements relating to permanent magnets
FR791283D FR791283A (en) 1934-06-19 1935-06-14 Permanent magnet

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1809734A GB440038A (en) 1934-06-19 1934-06-19 Improvements relating to permanent magnets

Publications (1)

Publication Number Publication Date
GB440038A true GB440038A (en) 1935-12-19

Family

ID=10106601

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1809734A Expired GB440038A (en) 1934-06-19 1934-06-19 Improvements relating to permanent magnets

Country Status (2)

Country Link
FR (1) FR791283A (en)
GB (1) GB440038A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE764867C (en) * 1936-09-11 1954-08-16 Siemens & Halske A G Permanent magnets and methods of increasing their strength

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2458336A (en) * 1947-07-16 1949-01-04 Wico Electric Co Field magnet unit for flywheel magnetos

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE764867C (en) * 1936-09-11 1954-08-16 Siemens & Halske A G Permanent magnets and methods of increasing their strength

Also Published As

Publication number Publication date
FR791283A (en) 1935-12-06

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