US1639588A - Apparatus for transmitting or reproducing sound - Google Patents

Apparatus for transmitting or reproducing sound Download PDF

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Publication number
US1639588A
US1639588A US119490A US11949026A US1639588A US 1639588 A US1639588 A US 1639588A US 119490 A US119490 A US 119490A US 11949026 A US11949026 A US 11949026A US 1639588 A US1639588 A US 1639588A
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US
United States
Prior art keywords
pole pieces
transmitting
reed
piece
secured
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 - Lifetime
Application number
US119490A
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English (en)
Inventor
Brown Sidney George
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Individual
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Individual
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Publication date
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Publication of US1639588A publication Critical patent/US1639588A/en
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Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
    • H04R11/00—Transducers of moving-armature or moving-core type

Definitions

  • This invention relates to apparatus for transmitting or reproducing sound, more particularly telephone receivers.
  • the object of the invention is' to improve such means of adjustment.
  • Figure 1 shows an elevation with the cover and diaphragm remove-d of a telephone receiver ear-piece
  • Figure 3 is a view looking on the back of Figure 1 with the casing removed
  • Figure 4 a perspective View showing the attachment of the pole pieces and bridge.
  • the magnets are formed of two stampings, a, b, semi-circular in shape with the centre portion remove-d. These are secured with their ends together by means of screws, c, c, to a brass back plate, d, which overlaps the two joints.
  • the pole pieces, e, e, on which are mounted the usual coils, f, j, are secured tothe magnets,
  • the two pole pieces on the opposite side to the reed are secured by any suitable fastening means, m, m, to a bridge or yokepiece,"n, of thin brass or other nonmagnetic material which has its two ends bent into feet which are'moimted by means of screws, p, p, on a solid piece ofv brass, 0 orother non-magnetic vmaterial in the centre of which is tapped a hole.
  • a reed stop, r may be provided upon this brass piece.
  • the magnets are secured to the casing, s, by means of two screws, t, @situated one on each side of the reed and assed through one of the magnets, a, the bac plate, d, and
  • the magnets are rigidly secured to the casing'and that the pole. pieces are secured to the magnet but at the same time are deformable by means of the milled nut at the back of the casing, thus providing means for adjusting the air gap Y between the reed or armature and the pole pieces of the magnet, while maintaming rigidity of support for the pole pieces.
  • the invention is applicable to any type of apparatus for transmitting or reproducing soundin which a vibrating element is em- I-Iaving now described my invention what I claim as newcand desire to secure byv Let ters Patent ist- 1.
  • phonic apparatus comprising an electro-magnet having pole pieces with an air gap therebetween, a iiexible non-magnetic yoke piece mounted upon vand bridging the gap between said pole pieces, a rigid member supporting said yoke piece, an armature situated over said a1r gap and means attached to said rigid member for bending said yoke piece together with said pole pieces towards and away from said armature, as set forth.
  • the ⁇ combination comprising magnets having pole pieces with an air gap therebetween, a flexible non-mag- A netic yoke 'piece mounted upon and bridging the gap between said pole pieces, windings surrounding said pole' pieces and portions of said yoke piece, lugs projecting from said yoke piece, a non-magnetic rigid member attached to said lugs, and means attached to said rigid member for bending said yoke piece together with sai-d -pole pieces relatively to said magnet, as set forth.
  • a telephone receiver comprising in compole pieces-towards and away from said reed.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Electrostatic, Electromagnetic, Magneto- Strictive, And Variable-Resistance Transducers (AREA)
US119490A 1925-09-19 1926-06-29 Apparatus for transmitting or reproducing sound Expired - Lifetime US1639588A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB23440/25A GB262869A (en) 1925-09-19 1925-09-19 Improvements in and relating to apparatus for transmitting or reproducing sound

Publications (1)

Publication Number Publication Date
US1639588A true US1639588A (en) 1927-08-16

Family

ID=10195656

Family Applications (1)

Application Number Title Priority Date Filing Date
US119490A Expired - Lifetime US1639588A (en) 1925-09-19 1926-06-29 Apparatus for transmitting or reproducing sound

Country Status (3)

Country Link
US (1) US1639588A (fr)
FR (1) FR618037A (fr)
GB (1) GB262869A (fr)

Also Published As

Publication number Publication date
GB262869A (en) 1926-12-20
FR618037A (fr) 1927-03-02

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