GB176045A - Improvements in or relating to alarm devices for doors, windows and the like - Google Patents

Improvements in or relating to alarm devices for doors, windows and the like

Info

Publication number
GB176045A
GB176045A GB3002320A GB3002320A GB176045A GB 176045 A GB176045 A GB 176045A GB 3002320 A GB3002320 A GB 3002320A GB 3002320 A GB3002320 A GB 3002320A GB 176045 A GB176045 A GB 176045A
Authority
GB
United Kingdom
Prior art keywords
circuit
door
window
doors
windows
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
GB3002320A
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 GB3002320A priority Critical patent/GB176045A/en
Publication of GB176045A publication Critical patent/GB176045A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H3/00—Mechanisms for operating contacts
    • H01H3/02—Operating parts, i.e. for operating driving mechanism by a mechanical force external to the switch
    • H01H3/16—Operating parts, i.e. for operating driving mechanism by a mechanical force external to the switch adapted for actuation at a limit or other predetermined position in the path of a body, the relative movement of switch and body being primarily for a purpose other than the actuation of the switch, e.g. for a door switch, a limit switch, a floor-levelling switch of a lift
    • H01H3/161—Operating parts, i.e. for operating driving mechanism by a mechanical force external to the switch adapted for actuation at a limit or other predetermined position in the path of a body, the relative movement of switch and body being primarily for a purpose other than the actuation of the switch, e.g. for a door switch, a limit switch, a floor-levelling switch of a lift for actuation by moving a closing member, e.g. door, cover or lid

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Security & Cryptography (AREA)
  • Burglar Alarm Systems (AREA)

Abstract

176,045. Bulley, H. E. July 18, 1921. Burglar and like alarms.-An alarm comprises two wedges, arranged one i nside the other, for inserti-n under a door or between the sashes of a window and adapted to ring an electric bell when the door r window is opened or the wedges are removed. T e inner wedge A is of insulating material and carries contacts D, F connected to one side of a bell-alarm circuit. The outer wedge B is of metal, is serrated at C to prevent slipping, and is connected to the other side of the alarm circuit. If the upper leaf of the wedge B be depressed by opening the door or window, it closes the circuit at D, and if the device be removed, the circuit is closed at F.
GB3002320A 1921-07-18 1921-07-18 Improvements in or relating to alarm devices for doors, windows and the like Expired GB176045A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB3002320A GB176045A (en) 1921-07-18 1921-07-18 Improvements in or relating to alarm devices for doors, windows and the like

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3002320A GB176045A (en) 1921-07-18 1921-07-18 Improvements in or relating to alarm devices for doors, windows and the like

Publications (1)

Publication Number Publication Date
GB176045A true GB176045A (en) 1922-03-09

Family

ID=10301007

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3002320A Expired GB176045A (en) 1921-07-18 1921-07-18 Improvements in or relating to alarm devices for doors, windows and the like

Country Status (1)

Country Link
GB (1) GB176045A (en)

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