GB181171A - Improvements in and connected with electric burglar alarms - Google Patents

Improvements in and connected with electric burglar alarms

Info

Publication number
GB181171A
GB181171A GB987721A GB987721A GB181171A GB 181171 A GB181171 A GB 181171A GB 987721 A GB987721 A GB 987721A GB 987721 A GB987721 A GB 987721A GB 181171 A GB181171 A GB 181171A
Authority
GB
United Kingdom
Prior art keywords
key
locks
burglar alarms
barrel
keyway
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
GB987721A
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 GB987721A priority Critical patent/GB181171A/en
Publication of GB181171A publication Critical patent/GB181171A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B13/00—Burglar, theft or intruder alarms
    • G08B13/22—Electrical actuation

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Burglar Alarm Systems (AREA)

Abstract

181,171. Kirk, G. April 4, 1921. Locks, revolving- barrel; locks operating burglar alarms.-Locks for use in a burglar alarm system are adapted to break a circuit when a key is inserted. The contact is kept closed by a spring E which when the key is inserted is raised by a pin C. The lock may have a lip on the fixed barrel overlapping the moveable barrel with a slot in line with the keyway in the latter so that a key can only be inserted when the slot is in line with the keyway.
GB987721A 1921-04-04 1921-04-04 Improvements in and connected with electric burglar alarms Expired GB181171A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB987721A GB181171A (en) 1921-04-04 1921-04-04 Improvements in and connected with electric burglar alarms

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB987721A GB181171A (en) 1921-04-04 1921-04-04 Improvements in and connected with electric burglar alarms

Publications (1)

Publication Number Publication Date
GB181171A true GB181171A (en) 1922-06-15

Family

ID=9880434

Family Applications (1)

Application Number Title Priority Date Filing Date
GB987721A Expired GB181171A (en) 1921-04-04 1921-04-04 Improvements in and connected with electric burglar alarms

Country Status (1)

Country Link
GB (1) GB181171A (en)

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