EP0021611A1 - Détecteur par système de sécurité - Google Patents

Détecteur par système de sécurité Download PDF

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Publication number
EP0021611A1
EP0021611A1 EP80301742A EP80301742A EP0021611A1 EP 0021611 A1 EP0021611 A1 EP 0021611A1 EP 80301742 A EP80301742 A EP 80301742A EP 80301742 A EP80301742 A EP 80301742A EP 0021611 A1 EP0021611 A1 EP 0021611A1
Authority
EP
European Patent Office
Prior art keywords
sensor unit
security system
cover
contact set
system sensor
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.)
Withdrawn
Application number
EP80301742A
Other languages
German (de)
English (en)
Inventor
Michael Joseph Burke
Peter Aucott
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.)
GKN Fasteners Ltd
Original Assignee
GKN Fasteners 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 GKN Fasteners Ltd filed Critical GKN Fasteners Ltd
Publication of EP0021611A1 publication Critical patent/EP0021611A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B29/00—Checking or monitoring of signalling or alarm systems; Prevention or correction of operating errors, e.g. preventing unauthorised operation
    • G08B29/02—Monitoring continuously signalling or alarm systems
    • G08B29/04—Monitoring of the detection circuits
    • G08B29/046—Monitoring of the detection circuits prevention of tampering with detection circuits
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B13/00—Burglar, theft or intruder alarms
    • G08B13/02—Mechanical actuation
    • G08B13/08—Mechanical actuation by opening, e.g. of door, of window, of drawer, of shutter, of curtain, of blind

Definitions

  • the invention relates to magnetic sensors for security systems.
  • the electrical contact set may be a magnetic read contact set, set into a door frame or window frame in which case the door or window is provided with a magnet assembly which comes into close proximity with the contact set when the door or window is closed but moves away from the contact set when the door or window is opened.
  • the contact set is such that the contacts are closed when the door or window is closed due to the proximity of the magnet but the contacts are automatically opened as the door or window is opened. In this way it is possible-for the contact set to signal that the door or window has been opened and to sound the alarm.
  • the electrical contact set is surface mounted on the door or window frame and co-operates with a magnet which is also surface mounted.
  • the sensor unit It is desirable for the sensor unit to be as small as possible to-facilitate a neat and unobtrusive installation.
  • a small unit can be difficult to work with if the installer of the security system has to connect several wires to the unit.
  • One known solution to this problem is to connect short wires permanently into the unit during manufacture so that the installer of the system merely connects one set of wires to another set.
  • the connectors involve some cost, introduce a further possibility for faulty connections and can help an intruder to foil the security system.
  • An object of the invention is to provide a small sensor unit to which wires can be connected more easily.
  • a security system sensor unit of the kind incorporating a magnetic read contact set and electrical connections to the sensor unit characterised in that the sensor unit comprises a single plastics moulding which has a recess incorporating the contact set and a plurality of electrical terminal locations for establishing connection between the contact set and the electrical leads to the contact set and for other electrical leads to the sensor unit and which has an integral cover pivotal between an open position in which access is available to the terminal-locations and a closed position in which the cover covers the terminal locations.
  • terminal locations are apertures in which screws are received.
  • the plastics moulding with the cover in the closed condition may be of square section and have an end flange to facilitate mounting of the unit in-a mounting hole with the flange flush with the surface in which the hole is drilled.
  • the flange may be removeable to facilitate an alternative means of mounting.
  • the sensor is constituted primarily by a single plastics moulding which has a main body 11 which is elongated and of generally square section.
  • An integrally moulded cover 12 is constituted by an inner flap 13 and an outer flap 14. Flap 13 is pivoted to the main body 11 and flap 14 is pivoted to the flap 13 by means of thin sections of the moulding which act as hinges 15 and 16 respectively.
  • the main body 16 has a recess 17 in its lower surface in which is located a conventional magnetic read contact set 18. Recess 17 communicates with a large depressed surface region 19 which is provided for the purpose of electrical connections to the sensor.
  • Flap 13 can be pivoted from the position shown to a closed position where it lies against the undersurface 21 of the main body 11 and closes the underside of the recess 17. When flap 13 is in this closed condition, flap 14 can be pivoted to close the depressed contact area 19. A lug 22 with a reverse taper then engages in a corresponding slot 23 to hold both flaps 13 and 14 of the cover 12 in the closed position.
  • Five blind screw holes such as the hole 24 shown in Figure 2 are provided in the depressed region 19 to receive self tapping screws such as the screw 25. The screw holes act as terminal locations for the screws which are used as electrical terminals. The arrangement of electrical connections is conventional. There are five wires 26 leading into the sensor.
  • the main body 11 is also provided with two countersunk mounting holes 33 best seen in Figure 3 and these mounting holes align with corresponding holes 34 in the cover flap 14 when the cover is in the closed position.
  • the complete sensor can be mounted by two wood screws passing through the mounting holes and these wood screws also help to hold the cover in the closed position.
  • Flange 35 is notched at 36 around a line corresponding to the cross section of the main body 11 and closed cover 12 so that the flange can be removed for surface mounting of the sensor by means of screws in the mounting holes.
  • An alternative mounting arrangement is to drill a hole of a diameter substantially equal to the diagonal dimension of the square section main body plus closed cover and to mount the sensor in this hole with the aid of the flange 35.
  • Flange 35 may incorporate appropriately positioned screw holes (not shown) to enable it to be screwed to a surface.
  • the end wall 37 remote from the flange 35 incorporates an opening 38 through which the wires 26 extend.
  • the sensor described above can be used in a versatile manner in that it can be mounted with very little adaptation either in a hole drilled in a surface or on a flat surface.
  • the unit is also compact and is constituted primarily by a single moulding, both of which factors tend to reduce the cost of the sensor.
  • the commonality between a surface mounting and recess mounting sensor also has economic advantages because it reduces the requirement for an installer to carry stocks of different types of sensors.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Security & Cryptography (AREA)
  • Burglar Alarm Systems (AREA)
  • Geophysics And Detection Of Objects (AREA)
EP80301742A 1979-06-08 1980-05-27 Détecteur par système de sécurité Withdrawn EP0021611A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB7920137 1979-06-08
GB7920137 1979-06-08

Publications (1)

Publication Number Publication Date
EP0021611A1 true EP0021611A1 (fr) 1981-01-07

Family

ID=10505741

Family Applications (1)

Application Number Title Priority Date Filing Date
EP80301742A Withdrawn EP0021611A1 (fr) 1979-06-08 1980-05-27 Détecteur par système de sécurité

Country Status (2)

Country Link
EP (1) EP0021611A1 (fr)
ES (1) ES8102383A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0132986A2 (fr) * 1983-07-28 1985-02-13 Securistyle Limited Montages à gonds
GB2149950A (en) * 1983-11-17 1985-06-19 Securistyle Ltd Alarm system
GB2176330A (en) * 1985-06-07 1986-12-17 Aica Kogyo Co Ltd Keysensor
US6609738B1 (en) 1996-02-20 2003-08-26 Securitron Magnalock Corp. Electromagnetic door lock system

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1278646A (en) * 1969-06-19 1972-06-21 Shorrock Dev Protective barrier
GB1396874A (en) * 1971-07-27 1975-06-11 Emi Ltd Magnetic alarm arrangements
US3975723A (en) * 1975-05-14 1976-08-17 Overhead Door Alert Company, Inc. Door alert system and magnetic switch therefor
US4018981A (en) * 1976-05-17 1977-04-19 General Motors Corporation Electrical component package

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1278646A (en) * 1969-06-19 1972-06-21 Shorrock Dev Protective barrier
GB1396874A (en) * 1971-07-27 1975-06-11 Emi Ltd Magnetic alarm arrangements
US3975723A (en) * 1975-05-14 1976-08-17 Overhead Door Alert Company, Inc. Door alert system and magnetic switch therefor
US4018981A (en) * 1976-05-17 1977-04-19 General Motors Corporation Electrical component package

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0132986A2 (fr) * 1983-07-28 1985-02-13 Securistyle Limited Montages à gonds
EP0132986A3 (fr) * 1983-07-28 1987-08-26 Securistyle Limited Montages à gonds
GB2149950A (en) * 1983-11-17 1985-06-19 Securistyle Ltd Alarm system
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
US6609738B1 (en) 1996-02-20 2003-08-26 Securitron Magnalock Corp. Electromagnetic door lock system

Also Published As

Publication number Publication date
ES492170A0 (es) 1980-12-16
ES8102383A1 (es) 1980-12-16

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Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Designated state(s): DE GB NL

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 19811213

RIN1 Information on inventor provided before grant (corrected)

Inventor name: BURKE, MICHAEL JOSEPH

Inventor name: AUCOTT, PETER