GB640193A - Improvements in or relating to alternating current buzzers - Google Patents

Improvements in or relating to alternating current buzzers

Info

Publication number
GB640193A
GB640193A GB33623/47A GB3362347A GB640193A GB 640193 A GB640193 A GB 640193A GB 33623/47 A GB33623/47 A GB 33623/47A GB 3362347 A GB3362347 A GB 3362347A GB 640193 A GB640193 A GB 640193A
Authority
GB
United Kingdom
Prior art keywords
induction coil
alternating current
dec
buzzers
relating
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
GB33623/47A
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.)
STC PLC
Original Assignee
Standard Telephone and Cables PLC
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 Standard Telephone and Cables PLC filed Critical Standard Telephone and Cables PLC
Publication of GB640193A publication Critical patent/GB640193A/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)
  • Audible And Visible Signals (AREA)

Abstract

640,193. Substation equipment. STANDARD TELEPHONES & CABLES, Ltd. Dec. 19, 1947, No. 33623. Convention date, Dec. 23, 1946. Drawings to Specification. [Class 40 (iv)] An alternating current buzzer for use in a telephone subset comprises an induction coil of a type normally used in subsets and having one or more air-gaps in its magnetic circuit, on which is detachably mounted a vibrating armature. The armature preferably comprises a plate of soft-iron or the like mounted on a leaf-spring arranged parallel to one of the surfaces of the magnet yoke and opposite an air gap. The induction coil when thus adapted serves both as an induction coil and as a receiver of calling current, so that the normal bell is not required.
GB33623/47A 1946-12-23 1947-12-19 Improvements in or relating to alternating current buzzers Expired GB640193A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL640193X 1946-12-23

Publications (1)

Publication Number Publication Date
GB640193A true GB640193A (en) 1950-07-12

Family

ID=19789414

Family Applications (1)

Application Number Title Priority Date Filing Date
GB33623/47A Expired GB640193A (en) 1946-12-23 1947-12-19 Improvements in or relating to alternating current buzzers

Country Status (1)

Country Link
GB (1) GB640193A (en)

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