GB165621A - Improvements in electric burglar alarms - Google Patents
Improvements in electric burglar alarmsInfo
- Publication number
- GB165621A GB165621A GB1324520A GB1324520A GB165621A GB 165621 A GB165621 A GB 165621A GB 1324520 A GB1324520 A GB 1324520A GB 1324520 A GB1324520 A GB 1324520A GB 165621 A GB165621 A GB 165621A
- Authority
- GB
- United Kingdom
- Prior art keywords
- window
- cord
- allbright
- bridge
- battery
- 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
- 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
165,621. Allbright, W. J., and Allbright, L. J. May 13, 1920. Burglar alarms.-To indicate the unauthorized opening of a window, a hard wood block l is slipped beneath the window cord and carries a bridge-piece n which is normally maintained by the'tension of the cord out of contact with plates m electrically connected with a battery and bell set contained in a casing. On opening the window, the initial movement of the sash cord causes the bridge-piece to roll over and make contact with the plates m, thus closing the bell circuit. A door alarm a of the wedge type may be associated with the battery and b'ell set.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1324520A GB165621A (en) | 1920-05-13 | 1920-05-13 | Improvements in electric burglar alarms |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1324520A GB165621A (en) | 1920-05-13 | 1920-05-13 | Improvements in electric burglar alarms |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB165621A true GB165621A (en) | 1921-07-07 |
Family
ID=10019444
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1324520A Expired GB165621A (en) | 1920-05-13 | 1920-05-13 | Improvements in electric burglar alarms |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB165621A (en) |
-
1920
- 1920-05-13 GB GB1324520A patent/GB165621A/en not_active Expired
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