GB691555A - Improvements in or relating to burglar alarms - Google Patents
Improvements in or relating to burglar alarmsInfo
- 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
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 In an alternative construction, Fig. 6, the armature may be withdrawn manually through a small slot 17 by means of a further magnet and then inserted through slot 16 on to support 5.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.
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)
| 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 |
-
1950
- 1950-12-12 GB GB3035750A patent/GB691555A/en not_active Expired
Cited By (7)
| 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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