GB220990A - Improvements in or relating to telephonic receivers - Google Patents

Improvements in or relating to telephonic receivers

Info

Publication number
GB220990A
GB220990A GB1408123A GB1408123A GB220990A GB 220990 A GB220990 A GB 220990A GB 1408123 A GB1408123 A GB 1408123A GB 1408123 A GB1408123 A GB 1408123A GB 220990 A GB220990 A GB 220990A
Authority
GB
United Kingdom
Prior art keywords
stem
lever
relating
magnet system
engage
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
GB1408123A
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to GB1408123A priority Critical patent/GB220990A/en
Priority to FR571638D priority patent/FR571638A/en
Publication of GB220990A publication Critical patent/GB220990A/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

Abstract

220,990. Graham, E. A. May 28, 1923. Magnetic instruments.-The magnet system of a telephone receiver is adapted to be moved away from the diaphragm or armature against a spring e by a lever h that acts on the stem b depending from the magnet system a and is controlled by a device such as an adjustable screw o or a cam. The lever may be formed, as shown, with an enlarged opening k through which the stem b can be passed and with a slot i the sides of which engage grooves g in the stem b. The lever may be provided with notches n, n<1> in which projections on the fulcrum piece m engage, or with a hole through which passes the reduced end of a shouldered pin forming the fulcrum piece.
GB1408123A 1923-05-28 1923-05-28 Improvements in or relating to telephonic receivers Expired GB220990A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB1408123A GB220990A (en) 1923-05-28 1923-05-28 Improvements in or relating to telephonic receivers
FR571638D FR571638A (en) 1923-05-28 1923-10-08 Telephone receiver

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1408123A GB220990A (en) 1923-05-28 1923-05-28 Improvements in or relating to telephonic receivers

Publications (1)

Publication Number Publication Date
GB220990A true GB220990A (en) 1924-08-28

Family

ID=10034636

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1408123A Expired GB220990A (en) 1923-05-28 1923-05-28 Improvements in or relating to telephonic receivers

Country Status (2)

Country Link
FR (1) FR571638A (en)
GB (1) GB220990A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8295536B2 (en) 2010-03-31 2012-10-23 Bose Corporation Moving magnet levered loudspeaker
US8295537B2 (en) 2010-03-31 2012-10-23 Bose Corporation Loudspeaker moment and torque balancing
US9055370B2 (en) 2012-08-31 2015-06-09 Bose Corporation Vibration-reducing passive radiators

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8295536B2 (en) 2010-03-31 2012-10-23 Bose Corporation Moving magnet levered loudspeaker
US8295537B2 (en) 2010-03-31 2012-10-23 Bose Corporation Loudspeaker moment and torque balancing
US9055370B2 (en) 2012-08-31 2015-06-09 Bose Corporation Vibration-reducing passive radiators

Also Published As

Publication number Publication date
FR571638A (en) 1924-05-21

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