GB691555A - Improvements in or relating to burglar alarms - Google Patents

Improvements in or relating to burglar alarms

Info

Publication number
GB691555A
GB691555A GB3035750A GB3035750A GB691555A GB 691555 A GB691555 A GB 691555A GB 3035750 A GB3035750 A GB 3035750A GB 3035750 A GB3035750 A GB 3035750A GB 691555 A GB691555 A GB 691555A
Authority
GB
United Kingdom
Prior art keywords
armature
magnet
door
dec
support
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
GB3035750A
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.)
FREDERICK GEORGE WOODALL
Original Assignee
FREDERICK GEORGE WOODALL
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 FREDERICK GEORGE WOODALL filed Critical FREDERICK GEORGE WOODALL
Priority to GB3035750A priority Critical patent/GB691555A/en
Publication of GB691555A publication Critical patent/GB691555A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H36/00—Switches actuated by change of magnetic field or of electric field, e.g. by change of relative position of magnet and switch, by shielding

Landscapes

  • Burglar Alarm Systems (AREA)

Abstract

691,555. Magnetic switches. WOODALL, F. G. Dec. 12, 1951 [Dec. 12, 1950], No. 30357/50. Class 38 (v) [Also in Group XXXVIII] A burglar alarm comprises a magnet 1 and a casing 2 containing an armature 3, which are fixed, one to the moving part of a door, window or the like, and the other to the frame or the like. The armature 3 is normally supported by shelf 5 and the arrangement is such that when the door is closed the armature 3 is pulled off the support 5 by the magnet so that when the door is next opened the armature 3 falls to complete an alarm circuit by making contacts 6. The armature may be raised to its supported position by thread 12. In an alternative construction, Fig. 6, the armature may be withdrawn manually through a small slot 17 by means of a further magnet and then inserted through slot 16 on to support 5. The magnet 1 may be swung back on hinge 18 to put the device out of operation.
GB3035750A 1950-12-12 1950-12-12 Improvements in or relating to burglar alarms Expired GB691555A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB3035750A GB691555A (en) 1950-12-12 1950-12-12 Improvements in or relating to burglar alarms

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3035750A GB691555A (en) 1950-12-12 1950-12-12 Improvements in or relating to burglar alarms

Publications (1)

Publication Number Publication Date
GB691555A true GB691555A (en) 1953-05-13

Family

ID=10306369

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3035750A Expired GB691555A (en) 1950-12-12 1950-12-12 Improvements in or relating to burglar alarms

Country Status (1)

Country Link
GB (1) GB691555A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3056470A (en) * 1959-04-09 1962-10-02 Schweiz Wagons Aufzuegefab Control system for elevators
US3075617A (en) * 1960-04-04 1963-01-29 Schweiz Wagons Aufzuegefab Safety means for the door of an elevator
DE1161183B (en) * 1960-08-26 1964-01-09 Siemens Ag Circuit arrangement to protect against break-ins and theft
GB2176330A (en) * 1985-06-07 1986-12-17 Aica Kogyo Co Ltd Keysensor
GB2204169A (en) * 1987-04-28 1988-11-02 Arnold Walmer Key reminder apparatus

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3056470A (en) * 1959-04-09 1962-10-02 Schweiz Wagons Aufzuegefab Control system for elevators
US3075617A (en) * 1960-04-04 1963-01-29 Schweiz Wagons Aufzuegefab Safety means for the door of an elevator
DE1161183B (en) * 1960-08-26 1964-01-09 Siemens Ag Circuit arrangement to protect against break-ins and theft
GB2176330A (en) * 1985-06-07 1986-12-17 Aica Kogyo Co Ltd Keysensor
GB2176330B (en) * 1985-06-07 1989-07-05 Aica Kogyo Co Ltd Key sensing system
GB2204169A (en) * 1987-04-28 1988-11-02 Arnold Walmer Key reminder apparatus
GB2204169B (en) * 1987-04-28 1991-10-09 Arnold Walmer Key reminder apparatus

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