GB735766A - Improvements in or relating to burglar alarm and like warning systems - Google Patents
Improvements in or relating to burglar alarm and like warning systemsInfo
- Publication number
- GB735766A GB735766A GB2668152A GB2668152A GB735766A GB 735766 A GB735766 A GB 735766A GB 2668152 A GB2668152 A GB 2668152A GB 2668152 A GB2668152 A GB 2668152A GB 735766 A GB735766 A GB 735766A
- Authority
- GB
- United Kingdom
- Prior art keywords
- chamber
- relay
- contacts
- orifice
- bridge
- 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
-
- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B25/00—Alarm systems in which the location of the alarm condition is signalled to a central station, e.g. fire or police telegraphic systems
- G08B25/008—Alarm setting and unsetting, i.e. arming or disarming of the security system
-
- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B13/00—Burglar, theft or intruder alarms
- G08B13/20—Actuation by change of fluid pressure
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Computer Security & Cryptography (AREA)
- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Fluid Mechanics (AREA)
- Burglar Alarm Systems (AREA)
Abstract
735,766. Pressure gauges. LEVY, J. P., and MEEKS, L. E. Dec. 21, 1953 [Oct. 23, 1952], No. 26681/52. Class 106 (2). [Also in Groups XXXVII and XXXVIII] A pressure-sensitive device for use in a burglar alarm comprises two compartments 20, 21 separated by a diaphragm 22, the compartment 20 having an orifice 23. The device is placed within the chamber, e.g. a room, to be protected, the pressure within the chamber being maintained at a value different from that existing outside the chamber by means such as a blower or fan, and a pipe is taken from the nipple 44 communicating with the compartment 21 to the outside atmosphere; alternatively the device is placed outside the chamber and a pipe led into the chamber from the nipple 44. The device is so adjusted, in particular by adjustment of the position of tension springs 40, that, when the desired pressure differential is maintained, the contact arm 35 is held in a central position with respect to contacts 38, 39. When a change in the pressure differential occurs, for example due to the opening of a door in the chamber or a person making an entrance through an alreadyexisting aperture, the arm 35 makes contact with one of the contacts 38, 39 thus short-circuiting the resistor 51 forming one arm of a normally balanced Wheatstone bridge. The resistor 51 is connected to the remaining arms of the Wheatstone bridge, which are associated with the alarm and may be located at a remote point, through a pair of leads 18. Upon the bridge becoming unbalanced, the relay 79 is energized, closing contacts 82, thus energizing the self-holding relay 83 having contacts 87, 88 and 90 and causing the alarm, shown as a bell 89, to be operated. The Wheatstone bridge and relay circuits are normally supplied from the A.C. mains through a bridge-rectifier 60 ; in the event of failure of the mains supply, relay 73 is de-energized and battery 72 is switched into the circuit. Opening of switch 69 releases the selfholding relay 83 and allows the circuit to be re-set. In order to prevent the system being rendered inoperative by blocking of the orifice 23, a small aperture 22a is made in the diaphragm 22, whereby the pressures in the two compartments become equalized should the orifice 23 be closed.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB2668152A GB735766A (en) | 1952-10-23 | 1952-10-23 | Improvements in or relating to burglar alarm and like warning systems |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB2668152A GB735766A (en) | 1952-10-23 | 1952-10-23 | Improvements in or relating to burglar alarm and like warning systems |
Publications (1)
Publication Number | Publication Date |
---|---|
GB735766A true GB735766A (en) | 1955-08-31 |
Family
ID=10247509
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB2668152A Expired GB735766A (en) | 1952-10-23 | 1952-10-23 | Improvements in or relating to burglar alarm and like warning systems |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB735766A (en) |
Cited By (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1981000043A1 (en) * | 1979-07-02 | 1981-01-22 | F Millar | Security apparatus |
JPS6034857U (en) * | 1983-08-16 | 1985-03-09 | ホーチキ株式会社 | fire detector |
JPS6075994A (en) * | 1983-09-30 | 1985-04-30 | 松下電工株式会社 | Differential spot type sensor and manufacture thereof |
JPS6184995U (en) * | 1985-09-25 | 1986-06-04 | ||
WO1987001227A1 (en) * | 1985-08-12 | 1987-02-26 | Millar Frederick W | Security apparatus |
JPS6251485U (en) * | 1985-09-12 | 1987-03-31 | ||
JPS6251487U (en) * | 1985-09-12 | 1987-03-31 | ||
EP0239817A2 (en) * | 1986-04-03 | 1987-10-07 | Richard Hirschmann GmbH & Co. | Method and device for protecting a space |
WO2006077111A1 (en) * | 2005-01-19 | 2006-07-27 | Airbus Deutschland Gmbh | Pressure-difference warning system |
CN111458066A (en) * | 2020-05-22 | 2020-07-28 | 上海意延机电工程有限公司 | Passive tension sensing device |
-
1952
- 1952-10-23 GB GB2668152A patent/GB735766A/en not_active Expired
Cited By (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1981000043A1 (en) * | 1979-07-02 | 1981-01-22 | F Millar | Security apparatus |
DE3049678C2 (en) * | 1979-07-02 | 1992-07-30 | Frederick William Frankston Victoria Au Millar | |
JPS6034857U (en) * | 1983-08-16 | 1985-03-09 | ホーチキ株式会社 | fire detector |
JPS6075994A (en) * | 1983-09-30 | 1985-04-30 | 松下電工株式会社 | Differential spot type sensor and manufacture thereof |
WO1987001227A1 (en) * | 1985-08-12 | 1987-02-26 | Millar Frederick W | Security apparatus |
JPH0449751Y2 (en) * | 1985-09-12 | 1992-11-24 | ||
JPS6251485U (en) * | 1985-09-12 | 1987-03-31 | ||
JPS6251487U (en) * | 1985-09-12 | 1987-03-31 | ||
JPH0449750Y2 (en) * | 1985-09-12 | 1992-11-24 | ||
JPS6184995U (en) * | 1985-09-25 | 1986-06-04 | ||
EP0239817A3 (en) * | 1986-04-03 | 1990-05-16 | Richard Hirschmann Gmbh & Co. | Method and device for protecting a space |
EP0239817A2 (en) * | 1986-04-03 | 1987-10-07 | Richard Hirschmann GmbH & Co. | Method and device for protecting a space |
WO2006077111A1 (en) * | 2005-01-19 | 2006-07-27 | Airbus Deutschland Gmbh | Pressure-difference warning system |
CN101107506B (en) * | 2005-01-19 | 2010-05-19 | 空中客车德国有限公司 | Pressure-difference warning system |
US8149140B2 (en) | 2005-01-19 | 2012-04-03 | Airbus Operations Gmbh | Pressure-difference warning system |
CN111458066A (en) * | 2020-05-22 | 2020-07-28 | 上海意延机电工程有限公司 | Passive tension sensing device |
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