GB251151A - Improvements in loud speaking devices for wireless receiving apparatus - Google Patents

Improvements in loud speaking devices for wireless receiving apparatus

Info

Publication number
GB251151A
GB251151A GB1981025A GB1981025A GB251151A GB 251151 A GB251151 A GB 251151A GB 1981025 A GB1981025 A GB 1981025A GB 1981025 A GB1981025 A GB 1981025A GB 251151 A GB251151 A GB 251151A
Authority
GB
United Kingdom
Prior art keywords
magnet
pins
horse
base
springs
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
GB1981025A
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.)
JOSEPH PIQUART
Original Assignee
JOSEPH PIQUART
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 PIQUART filed Critical JOSEPH PIQUART
Priority to GB1981025A priority Critical patent/GB251151A/en
Publication of GB251151A publication Critical patent/GB251151A/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
    • H04R13/00—Transducers having an acoustic diaphragm of magnetisable material directly co-acting with electromagnet
    • H04R13/02—Telephone receivers

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)

Abstract

251,151. Piquart, J. Aug. 6, 1925. Magnetic instruments; loud-speakers.-A loudspeaker for wireless receiving apparatus comprises a magnet structure held down against the action of helical springs upon a seat or pad of sponge rubber or other shock-absorbing material by means of a nut, the manipulation of which effects the adjustment of the magnet towards and from the diaphragm; the magnet structure comprises a horse-shoe magnet and an additional magnetic mass, spaced and insulated therefrom. The magnet 1 is carried on a plate 3 provided with pins 4 which pass through the base 6 of the instrument, and are surrounded by springs 8 bearing against the base. The pad 9 of sponge rubber &c., lies between the plate 3 and the base, and is provided with holes to take the pins 4 and springs 8. The pole pieces 2 are carried by screwed pins 11 on the horse-shoe magnet, and, clamped to the pins 11 by plates 14 are soft iron rods 13, bent to horse-shoe shape. The horn is screwed into a boss 27 on the casing.
GB1981025A 1925-08-06 1925-08-06 Improvements in loud speaking devices for wireless receiving apparatus Expired GB251151A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1981025A GB251151A (en) 1925-08-06 1925-08-06 Improvements in loud speaking devices for wireless receiving apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1981025A GB251151A (en) 1925-08-06 1925-08-06 Improvements in loud speaking devices for wireless receiving apparatus

Publications (1)

Publication Number Publication Date
GB251151A true GB251151A (en) 1926-04-29

Family

ID=10135596

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1981025A Expired GB251151A (en) 1925-08-06 1925-08-06 Improvements in loud speaking devices for wireless receiving apparatus

Country Status (1)

Country Link
GB (1) GB251151A (en)

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