GB921784A - Improvements in or relating to alarm systems - Google Patents

Improvements in or relating to alarm systems

Info

Publication number
GB921784A
GB921784A GB3653759A GB3653759A GB921784A GB 921784 A GB921784 A GB 921784A GB 3653759 A GB3653759 A GB 3653759A GB 3653759 A GB3653759 A GB 3653759A GB 921784 A GB921784 A GB 921784A
Authority
GB
United Kingdom
Prior art keywords
relating
wall
alarm systems
compartment
mixture
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
GB3653759A
Inventor
Cyril Clifford Hall
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.)
Walter Kidde Ltd
Original Assignee
Walter Kidde 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 Walter Kidde Ltd filed Critical Walter Kidde Ltd
Priority to GB3653759A priority Critical patent/GB921784A/en
Publication of GB921784A publication Critical patent/GB921784A/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
    • G10K1/063—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 the sounding member being a bell

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Geophysics And Detection Of Objects (AREA)
  • Burglar Alarm Systems (AREA)

Abstract

921,784. Electric bells. WALTER KIDDE CO. Ltd. Jan. 30, 1961 [Oct. 28, 1959], No. 36537/59. Class 13. Impacts of an electromagnetically-operated striker, such as an arm 32 rotated by an electric motor, are communicated through a wall 15, either directly or by way of a resiliently mounted bolt 13, to a hammer 12 which is thereby caused to strike a gong 11. The wall 15 may divide a compartment 10, which is liable to contain an explosive mixture, from another compartment 31 which is free from such a mixture.
GB3653759A 1959-10-28 1959-10-28 Improvements in or relating to alarm systems Expired GB921784A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB3653759A GB921784A (en) 1959-10-28 1959-10-28 Improvements in or relating to alarm systems

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3653759A GB921784A (en) 1959-10-28 1959-10-28 Improvements in or relating to alarm systems

Publications (1)

Publication Number Publication Date
GB921784A true GB921784A (en) 1963-03-20

Family

ID=10389057

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3653759A Expired GB921784A (en) 1959-10-28 1959-10-28 Improvements in or relating to alarm systems

Country Status (1)

Country Link
GB (1) GB921784A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4631526A (en) * 1982-06-10 1986-12-23 Automated Security Holdings, Ltd. Theft proof alarm bell assembly

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4631526A (en) * 1982-06-10 1986-12-23 Automated Security Holdings, Ltd. Theft proof alarm bell assembly

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