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GB1420203A - Intrusion detection apparatus - Google Patents

Intrusion detection apparatus

Info

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
Application number
GB4637672A
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.)
HIRD BROWN Ltd
Original Assignee
HIRD BROWN Ltd
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 HIRD BROWN Ltd filed Critical HIRD BROWN Ltd
Priority to GB4637672A priority Critical patent/GB1420203A/en
Publication of GB1420203A publication Critical patent/GB1420203A/en
Expired legal-status Critical Current

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.
GB4637672A 1972-10-07 1972-10-07 Intrusion detection apparatus Expired GB1420203A (en)

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)

* Cited by examiner, † Cited by third party
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

Cited By (4)

* Cited by examiner, † Cited by third party
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