GB1420203A - Intrusion detection apparatus - Google Patents
Intrusion detection apparatusInfo
- Publication number
- GB1420203A GB1420203A GB4637672A GB4637672A GB1420203A GB 1420203 A GB1420203 A GB 1420203A GB 4637672 A GB4637672 A GB 4637672A GB 4637672 A GB4637672 A GB 4637672A GB 1420203 A GB1420203 A GB 1420203A
- Authority
- GB
- United Kingdom
- Prior art keywords
- source
- detector
- radiation
- operated
- sources
- 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
- G08B13/00—Burglar, theft or intruder alarms
- G08B13/18—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength
- G08B13/181—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength using active radiation detection systems
- G08B13/183—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength using active radiation detection systems by interruption of a radiation beam or barrier
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16P—SAFETY DEVICES IN GENERAL; SAFETY DEVICES FOR PRESSES
- F16P3/00—Safety devices acting in conjunction with the control or operation of a machine; Control arrangements requiring the simultaneous use of two or more parts of the body
- F16P3/12—Safety devices acting in conjunction with the control or operation of a machine; Control arrangements requiring the simultaneous use of two or more parts of the body with means, e.g. feelers, which in case of the presence of a body part of a person in or near the danger zone influence the control or operation of the machine
- F16P3/14—Safety devices acting in conjunction with the control or operation of a machine; Control arrangements requiring the simultaneous use of two or more parts of the body with means, e.g. feelers, which in case of the presence of a body part of a person in or near the danger zone influence the control or operation of the machine the means being photocells or other devices sensitive without mechanical contact
- F16P3/144—Safety devices acting in conjunction with the control or operation of a machine; Control arrangements requiring the simultaneous use of two or more parts of the body with means, e.g. feelers, which in case of the presence of a body part of a person in or near the danger zone influence the control or operation of the machine the means being photocells or other devices sensitive without mechanical contact using light grids
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/94—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the way in which the control signals are generated
- H03K17/941—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the way in which the control signals are generated using an optical detector
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Burglar Alarm Systems (AREA)
Abstract
1420203 Machinery safety device HIRD BROWN Ltd 29 Aug 1973 [7 Oct 1972] 46376/72 Heading F2J [Also in Division G1] A light screen comprises a plurality of sources and detectors arranged in a chain so that reception of radiation by one detector causes the energization of the next source. As shown, the sources 1a, 1b 1c, 1d, which may be GaAs LEDs, direct narrow beams of IR radiation in alternate directions across the protected area to corresponding detectors 2a, 2b, 2c, 2d, which may be Si phototransistors. Each detector is arranged to supply power to the next adjacent source on receipt of a radiation beam, a transformer 3, 4 being inserted in the path between detector 2d and source 1a. The arrangement forms a loop which self oscillates until an object intrudes into any of the beam paths. A drive circuit 10 detects the cessation of the oscillation and provides a signal to logic self checking circuit 20 controlled by cam operated microswitches 21, 22, 23 to stop the machine 30 to prevent damage or injury. An alarm may also be operated. A special switch is provided to re-establish oscillation of the barrier. The arrangement may be operated in an open loop mode using an oscillator to control the first source in the chain.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB4637672A GB1420203A (en) | 1972-10-07 | 1972-10-07 | Intrusion detection apparatus |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB4637672A GB1420203A (en) | 1972-10-07 | 1972-10-07 | Intrusion detection apparatus |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1420203A true GB1420203A (en) | 1976-01-07 |
Family
ID=10441000
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB4637672A Expired GB1420203A (en) | 1972-10-07 | 1972-10-07 | Intrusion detection apparatus |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB1420203A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2180029A (en) * | 1985-09-03 | 1987-03-18 | Coal Ind | Personnel detection and protection systems for use in underground mines |
GB2227309A (en) * | 1989-01-18 | 1990-07-25 | Formula Systems Ltd | Detection system |
EP0801260A1 (en) * | 1996-04-12 | 1997-10-15 | Robert Bosch Gmbh | Safety device for a driving device, particularly for a device for a garage door |
-
1972
- 1972-10-07 GB GB4637672A patent/GB1420203A/en not_active Expired
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2180029A (en) * | 1985-09-03 | 1987-03-18 | Coal Ind | Personnel detection and protection systems for use in underground mines |
GB2180029B (en) * | 1985-09-03 | 1989-08-23 | Coal Ind | Personnel detection and protection systems for use in underground mines |
GB2227309A (en) * | 1989-01-18 | 1990-07-25 | Formula Systems Ltd | Detection system |
EP0801260A1 (en) * | 1996-04-12 | 1997-10-15 | Robert Bosch Gmbh | Safety device for a driving device, particularly for a device for a garage door |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed | ||
PCNP | Patent ceased through non-payment of renewal fee |