GB302093A - Improvements in theft alarms - Google Patents

Improvements in theft alarms

Info

Publication number
GB302093A
GB302093A GB761428A GB761428A GB302093A GB 302093 A GB302093 A GB 302093A GB 761428 A GB761428 A GB 761428A GB 761428 A GB761428 A GB 761428A GB 302093 A GB302093 A GB 302093A
Authority
GB
United Kingdom
Prior art keywords
alarm
plates
alarms
mat
kalikow
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
GB761428A
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 GB761428A priority Critical patent/GB302093A/en
Publication of GB302093A publication Critical patent/GB302093A/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
    • G08B13/02—Mechanical actuation

Abstract

302,093. Kalikow, S. M. March 12, 1928. Burglar and like alarms.-The circuit of an electric alarm 11 is completed by a.n authorized or unauthorized person bridging the upper or lower pair of three thin metal plates 1, 3, 5 which are separated by insulating sheets 2, 4 forming therewith a floor mat. The alarm may be intentionally sounded by an operator puncturing thesheets 5, 4 by means of a steel pin secured to his shoe, thus connecting the plates 5, 3. When the premises are locked for the night, the lock plunger- 13 closes a switch 6, whereupon any person standing on the mat makes contact between the plates- 3,1 through perforations in the sheet. 2 and sounds the alarm.
GB761428A 1928-03-12 1928-03-12 Improvements in theft alarms Expired GB302093A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB761428A GB302093A (en) 1928-03-12 1928-03-12 Improvements in theft alarms

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB761428A GB302093A (en) 1928-03-12 1928-03-12 Improvements in theft alarms

Publications (1)

Publication Number Publication Date
GB302093A true GB302093A (en) 1928-12-13

Family

ID=9836494

Family Applications (1)

Application Number Title Priority Date Filing Date
GB761428A Expired GB302093A (en) 1928-03-12 1928-03-12 Improvements in theft alarms

Country Status (1)

Country Link
GB (1) GB302093A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2174830A (en) * 1985-04-27 1986-11-12 David Clark Tamper-proof enclosures
GB2346737A (en) * 1999-02-09 2000-08-16 Jordan Advertising Limited Switch for use in an advertising appliance

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2174830A (en) * 1985-04-27 1986-11-12 David Clark Tamper-proof enclosures
GB2346737A (en) * 1999-02-09 2000-08-16 Jordan Advertising Limited Switch for use in an advertising appliance

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