GB867341A - Improvements in and relating to audible warning devices - Google Patents

Improvements in and relating to audible warning devices

Info

Publication number
GB867341A
GB867341A GB4179058A GB4179058A GB867341A GB 867341 A GB867341 A GB 867341A GB 4179058 A GB4179058 A GB 4179058A GB 4179058 A GB4179058 A GB 4179058A GB 867341 A GB867341 A GB 867341A
Authority
GB
United Kingdom
Prior art keywords
dome
striker
spring
dec
telephones
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
GB4179058A
Inventor
Frederick Steiner
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.)
Ericsson Telephones Ltd
Original Assignee
Ericsson Telephones 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 Ericsson Telephones Ltd filed Critical Ericsson Telephones Ltd
Priority to GB4179058A priority Critical patent/GB867341A/en
Publication of GB867341A publication Critical patent/GB867341A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K1/00—Devices in which sound is produced by striking a resonating body, e.g. bells, chimes or gongs
    • G10K1/06—Devices in which sound is produced by striking a resonating body, e.g. bells, chimes or gongs the resonating devices having the shape of a bell, plate, rod, or tube
    • G10K1/062—Devices in which sound is produced by striking a resonating body, e.g. bells, chimes or gongs the resonating devices having the shape of a bell, plate, rod, or tube electrically operated

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Apparatuses For Generation Of Mechanical Vibrations (AREA)

Abstract

867,341. Electric bells. ERICSSON TELEPHONES Ltd. Dec. 16, 1959 [Dec. 27, 1958], No. 41790/68. Class 13. In a low-powered (2 milli-watt) electric bell particularly for use in telephones, the dome, 1, which is at least partly made of magnetic material is set into vibration by an electromagnet 7. The striker, 6, supported by a spring 5, is in light contact with the inner periphery of the dome and adjacent to the polepiece. Application of 200 c/s. A.C. (the resonant frequency of the dome) to the magnet causes a deformation of the dome alternately towards and away from 7. The striker, 6, impelled by the distorted dome, moves away from it, but, due to the spring, it is returned to its previous position, thus striking the dome. The vibrator may be of any shape provided it is partly magnetic and is capable of emitting sound when struck repeatedly. The spring 5 need not be used, the striker being retained by gravity (Fig. 2, not shown).
GB4179058A 1958-12-27 1958-12-27 Improvements in and relating to audible warning devices Expired GB867341A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB4179058A GB867341A (en) 1958-12-27 1958-12-27 Improvements in and relating to audible warning devices

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB4179058A GB867341A (en) 1958-12-27 1958-12-27 Improvements in and relating to audible warning devices

Publications (1)

Publication Number Publication Date
GB867341A true GB867341A (en) 1961-05-03

Family

ID=10421379

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4179058A Expired GB867341A (en) 1958-12-27 1958-12-27 Improvements in and relating to audible warning devices

Country Status (1)

Country Link
GB (1) GB867341A (en)

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