EP0568137A1 - A mounting structure for an electrical apparatus having a device indicating removal of same - Google Patents

A mounting structure for an electrical apparatus having a device indicating removal of same Download PDF

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Publication number
EP0568137A1
EP0568137A1 EP93201118A EP93201118A EP0568137A1 EP 0568137 A1 EP0568137 A1 EP 0568137A1 EP 93201118 A EP93201118 A EP 93201118A EP 93201118 A EP93201118 A EP 93201118A EP 0568137 A1 EP0568137 A1 EP 0568137A1
Authority
EP
European Patent Office
Prior art keywords
box
insert
mounting structure
members
reeds
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.)
Granted
Application number
EP93201118A
Other languages
German (de)
French (fr)
Other versions
EP0568137B1 (en
Inventor
Antonio Aldizio
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.)
BTicino SpA
Original Assignee
BTicino SpA
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 BTicino SpA filed Critical BTicino SpA
Publication of EP0568137A1 publication Critical patent/EP0568137A1/en
Application granted granted Critical
Publication of EP0568137B1 publication Critical patent/EP0568137B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • GPHYSICS
    • G08SIGNALLING
    • G08BSIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B13/00Burglar, theft or intruder alarms
    • G08B13/02Mechanical actuation
    • G08B13/14Mechanical actuation by lifting or attempted removal of hand-portable articles
    • G08B13/149Mechanical actuation by lifting or attempted removal of hand-portable articles with electric, magnetic, capacitive switch actuation
    • GPHYSICS
    • G08SIGNALLING
    • G08BSIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B29/00Checking or monitoring of signalling or alarm systems; Prevention or correction of operating errors, e.g. preventing unauthorised operation
    • G08B29/02Monitoring continuously signalling or alarm systems
    • G08B29/04Monitoring of the detection circuits
    • G08B29/046Monitoring of the detection circuits prevention of tampering with detection circuits

Definitions

  • This invention relates to electric systems, and particularly to a structure for mounting an electrical apparatus inside a box, especially an apparatus equipped with a device for indicating removal of the apparatus from the box,
  • a commonly used expedient for indicating that electric apparatus housed in wall hung or set-in boxes have been tampered with provides electric components consisting of two discrete members coupled to each other whose electrical behavior is altered as the two members are moved away from each other.
  • a typical component of this type is the reed relay, wherein the two coupled members are a pair of ferromagnetic contacts and a permanent magnet.
  • the two coupled members are a pair of ferromagnetic contacts and a permanent magnet.
  • one of the members e.g. the permanent magnet, would be rigidly connected to an insert unreleasably attached to the box, and the other member to the electrical apparatus, in turn attached to the box in a removable fashion.
  • the reed relay is part of an indicator circuit, which may be the alarm circuit itself in which the electrical apparatus is connected in the instance of an intrusion-resisting system, and is connected such that the removal of the apparatus mounted in the box, and hence of the contact from the magnet, would result in an alarm being tripped upon the contact being opened or closed, depending on the reed relay type.
  • the member that is connected to the apparatus is usually located within the apparatus casing, close to the wall which locates opposite to the bottom of the box in which the apparatus is mounted.
  • the member that is connected to the box is attached to the latter either directly or through a specially provided support base, using screws, adhesives, or a strip of a double-sided adhesive material.
  • a group 10 of three modular construction electrical apparatus 11, 12 and 13 held together on a frame 14 is intended to be releasably fastened, such as by means of two screws 15, to the interior of a box 16 having a rectangular cross-sectional shape and being adapted to be set in a wall.
  • the frame 14 has lead-in walls 14a to facilitate alignment of the two parts.
  • One of the three apparatus may be an infrared detector of moving objects, and contains contacts (hidden from view in the drawing) of a reed relay on the bottom of its casing.
  • the permanent magnet for operating the reed relay, indicated at 17, is attached to an insert 18 adapted to be secured releasably on the box 16 interior.
  • the insert 18 comprises an elongate body 19 made of a non-magnetic material, e.g. a plastics molding, and having a recess wherein the magnet 17 is accommodated and held.
  • Two spring reeds 20, e.g. made of steel, are respectively attached to the ends of the body 19 by means of grooves 19a and interfitting formations 19b.
  • the free ends of the reeds 20 are each formed with two prongs 20a and are set apart a greater distance than the inside width dimension of the box 16.
  • Two tabs 21 are blanked out of the reeds 20 and suitably bent to locate at a spacing from one another smaller than the distance between the lower and upper sides of the apparatus 11. These sides have each a pair of parallel ribs 11a spaced apart to receive and guide the tabs 21.
  • the parts described above jointly define a mounting structure for mounting the group of electrical apparatus 10 inside the box 16, which is installed by first joining the insert 18 with the apparatus, as by forcing the latter in place between the tabs 21, and then fitting the group into the box 16 with the insert in place.
  • the group 10 will automatically align to the box by virtue of the lead-in walls 14a provided, and the insert 18 -- whose reeds 20 bend elastically inwards upon its introduction -- will also locate automatically in the box and retain its position relative to the apparatus 11.
  • the insert 18 is held unreleasably to the box by the prongs 20a engaging the opposed longitudinal walls of the box 15 under the spring bias from the reeds 20.
  • the insert 18 functions similar to an expansion anchor means.
  • the group 10 can be disassembled and reassembled without altering the mutual positioning of the insert and the apparatus.
  • the insert 18, although unreleasably secured from the operational standpoint may be easily taken, where required, out the box for use at another location in combination with the same or another apparatus, because of the expansion anchor-like arrangement relying on the comparatively modest spring bias provided by the reeds 20.
  • the mounting structure of this invention affords optimum positioning of the insert 18 and the apparatus 11 irrespective of the box depth.
  • a cylindrical box could be substituted for the rectangular box; the tabs 21 and corresponding ribs 11a could be replaced with some other guiding and fastening arrangement between the insert and the apparatus; instead of a reed relay, other components could be employed whose electrical characteristics be tied to the distance therebetween, such as a coil with a detachable ferromagnetic core, a separable plate capacitive element, a photoelectric coupler, a monostable microswitch, etc.. If required, moreover, terminals may be provided in the insert for any supply or connection lines to the portion of the electrical device housed therein.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Security & Cryptography (AREA)
  • Casings For Electric Apparatus (AREA)
  • Details Of Connecting Devices For Male And Female Coupling (AREA)

Abstract

A structure is disclosed for mounting, inside a box (16), an electrical apparatus (11) having a device for indicating removal of the apparatus from the box associated therewith. The device comprises two members coupled together and means adapted to produce a signal upon the two members being parted together. One of said members is affixed to the apparatus (11) and the other (17) to an insert (18) joined to the box (16) through expansion anchor means (20) engaging the walls of the box (16).

Description

  • This invention relates to electric systems, and particularly to a structure for mounting an electrical apparatus inside a box, especially an apparatus equipped with a device for indicating removal of the apparatus from the box,
  • In installing electric systems, it is frequently necessary to apply measures directed to prevent, or at least indicate, tampering with the system apparatus. Such is the case, for instance, with intrusion-resisting apparatus, wherein the removal of a critical system component such as a detector may render the system ineffective, or with electrical control and monitoring panels of power supply networks for industrial or civil uses, which could be tampered with by unauthorized personnel with the result that unforeseen damage may be caused to electrical apparatus connected in the system, or with elevator pushbutton strips incorporating key-operated safeguard mechanisms to only allow the elevator to be stopped at certain floors by holders of the corresponding keys, wherein an unauthorized person still could, by prying out a safeguarded pushbutton, close its respective contact and so gain access to a restricted floor.
  • A commonly used expedient for indicating that electric apparatus housed in wall hung or set-in boxes have been tampered with provides electric components consisting of two discrete members coupled to each other whose electrical behavior is altered as the two members are moved away from each other. A typical component of this type is the reed relay, wherein the two coupled members are a pair of ferromagnetic contacts and a permanent magnet. In operation, one of the members, e.g. the permanent magnet, would be rigidly connected to an insert unreleasably attached to the box, and the other member to the electrical apparatus, in turn attached to the box in a removable fashion. The reed relay is part of an indicator circuit, which may be the alarm circuit itself in which the electrical apparatus is connected in the instance of an intrusion-resisting system, and is connected such that the removal of the apparatus mounted in the box, and hence of the contact from the magnet, would result in an alarm being tripped upon the contact being opened or closed, depending on the reed relay type.
  • The member that is connected to the apparatus is usually located within the apparatus casing, close to the wall which locates opposite to the bottom of the box in which the apparatus is mounted. In conventional applications, the member that is connected to the box is attached to the latter either directly or through a specially provided support base, using screws, adhesives, or a strip of a double-sided adhesive material. These fastening arrangements have, however, some drawbacks. In fact, screw fastening is a comparatively awkward operation because the member to be fastened must be first positioned accurately, then holes must be drilled through the box bottom, and the screws tightened, and on the other hand, fastening with adhesives or double-sided adhesive material, while being simpler, is also rather awkward because it still requires accurate positioning, and tends to be unreliable as the adhesive deteriorates over time. In all cases, moreover, the level reached by the electric apparatus in its ultimate position within the box must be either known or measured, so that the two coupled members locate, on completion of the installation, at a prescribed mutual distance for proper operation, which distance should be the least possible in the instance of a reed relay. It should be noted that in many cases, in view of the different depth of the boxes used for enclosing electrical apparatus, shims would have to be fitted between the member to be fastened to the box and the box bottom.
  • It is the object of this invention to provide a mounting structure of the type specified above, which has none of the aforementioned drawbacks and is simple and reliable, as well as convenient to install.
  • This object is achieved by a mounting structure as defined and characterized in the claims appended to this description.
  • The invention can be more clearly understood from the following detailed description of an exemplary, and in no way limitative embodiment thereof, to be read in conjunction with the accompanying drawing, the single Figure whereof shows the inventive mounting structure and various parts prior to installation.
  • As shown in the drawing, a group 10 of three modular construction electrical apparatus 11, 12 and 13 held together on a frame 14 is intended to be releasably fastened, such as by means of two screws 15, to the interior of a box 16 having a rectangular cross-sectional shape and being adapted to be set in a wall. The frame 14 has lead-in walls 14a to facilitate alignment of the two parts.
  • One of the three apparatus, namely the one denoted by 11 in the drawing, may be an infrared detector of moving objects, and contains contacts (hidden from view in the drawing) of a reed relay on the bottom of its casing. The permanent magnet for operating the reed relay, indicated at 17, is attached to an insert 18 adapted to be secured releasably on the box 16 interior.
  • The insert 18 comprises an elongate body 19 made of a non-magnetic material, e.g. a plastics molding, and having a recess wherein the magnet 17 is accommodated and held. Two spring reeds 20, e.g. made of steel, are respectively attached to the ends of the body 19 by means of grooves 19a and interfitting formations 19b. The free ends of the reeds 20 are each formed with two prongs 20a and are set apart a greater distance than the inside width dimension of the box 16.
  • Two tabs 21 are blanked out of the reeds 20 and suitably bent to locate at a spacing from one another smaller than the distance between the lower and upper sides of the apparatus 11. These sides have each a pair of parallel ribs 11a spaced apart to receive and guide the tabs 21.
  • The parts described above jointly define a mounting structure for mounting the group of electrical apparatus 10 inside the box 16, which is installed by first joining the insert 18 with the apparatus, as by forcing the latter in place between the tabs 21, and then fitting the group into the box 16 with the insert in place. The group 10 will automatically align to the box by virtue of the lead-in walls 14a provided, and the insert 18 -- whose reeds 20 bend elastically inwards upon its introduction -- will also locate automatically in the box and retain its position relative to the apparatus 11. In addition, the insert 18 is held unreleasably to the box by the prongs 20a engaging the opposed longitudinal walls of the box 15 under the spring bias from the reeds 20. Thus, the insert 18 functions similar to an expansion anchor means.
  • Notice that once the insert 18 is secured in place, the group 10 can be disassembled and reassembled without altering the mutual positioning of the insert and the apparatus. It should be also noted that the insert 18, although unreleasably secured from the operational standpoint, may be easily taken, where required, out the box for use at another location in combination with the same or another apparatus, because of the expansion anchor-like arrangement relying on the comparatively modest spring bias provided by the reeds 20. And moreover, notice that the mounting structure of this invention affords optimum positioning of the insert 18 and the apparatus 11 irrespective of the box depth.
  • While a single embodiment has been described and illustrated, it is understood that many changes and modifications could be introduced as fall within the same inventive concept. For example, a cylindrical box could be substituted for the rectangular box; the tabs 21 and corresponding ribs 11a could be replaced with some other guiding and fastening arrangement between the insert and the apparatus; instead of a reed relay, other components could be employed whose electrical characteristics be tied to the distance therebetween, such as a coil with a detachable ferromagnetic core, a separable plate capacitive element, a photoelectric coupler, a monostable microswitch, etc.. If required, moreover, terminals may be provided in the insert for any supply or connection lines to the portion of the electrical device housed therein.

Claims (4)

  1. A structure for mounting an electrical apparatus inside a box (16), especially an apparatus (11) which is attached releasably to the box (16) and equipped with a device for indicating removal of the apparatus (11) from the box (16), said device comprising two members coupled together within the box (16) and means operative to generate a signal upon the two members being parted together, and said members being affixed, the one to the apparatus (11) and the other (17) to an insert (18) attached to the box (16) by unreleasable fastening means, the structure being characterized in that the unreleasable fastening means comprise expansion anchor means (20) engaging the box (16) walls.
  2. A mounting structure according to Claim 1, characterized in that it further comprises fastening means (21,11a) effective to hold the insert (18) removably to the apparatus (11) in a predetermined position prior to fitting the apparatus (11) and the insert (18) into the box (16).
  3. A mounting structure according to either Claim 1 or 2, characterized in that the expansion anchor means (20) comprise two spring reeds (20) being attached to the insert (18) on two opposed sides of the latter and having at least one prong (20a) on their free ends, the distance between the free ends of the reeds before fitting the insert (18) into the box (16) being larger than the distance between said box (16) walls engaged by said expansion anchor means (20).
  4. A mounting structure according to Claim 3 as dependent on Claim 2, characterized in that the means of fastening the insert (18) to the apparatus (11) comprise two spring tabs (21) being formed each from one of the spring reeds (20) integrally therewith, and guide and bearing means (11a) on opposed sides of the apparatus for receiving the two tabs (21) in push fit relationship on said opposed sides.
EP93201118A 1992-04-30 1993-04-17 A mounting structure for an electrical apparatus having a device indicating removal of same Expired - Lifetime EP0568137B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITMI921036A IT1255115B (en) 1992-04-30 1992-04-30 ASSEMBLY STRUCTURE OF AN ELECTRICAL APPLIANCE WITH SIGNALING DEVICE FOR REMOVAL OF ITSELF
ITMI921036 1992-04-30

Publications (2)

Publication Number Publication Date
EP0568137A1 true EP0568137A1 (en) 1993-11-03
EP0568137B1 EP0568137B1 (en) 1996-11-27

Family

ID=11363135

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93201118A Expired - Lifetime EP0568137B1 (en) 1992-04-30 1993-04-17 A mounting structure for an electrical apparatus having a device indicating removal of same

Country Status (4)

Country Link
EP (1) EP0568137B1 (en)
DE (1) DE69306158T2 (en)
ES (1) ES2095558T3 (en)
IT (1) IT1255115B (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2412472A (en) * 2004-03-25 2005-09-28 Optex Co Ltd Tampering switch for security sensors
DE102005062492A1 (en) * 2005-12-27 2007-07-12 Albrecht Jung Gmbh & Co. Kg Electrical/electronic installation device for building system engineering, has screw attached to stud that comes in contact with contact positions of printed circuit board, where contact positions are in connection with alarm device
FR2930666A1 (en) * 2008-04-29 2009-10-30 Radio Systemes Ingenierie Sa Detection unit for use in security, alarm and/or monitoring system, has inclinometer for measuring variation of absolute angle with respect to vertical of reference surface, and delivering measured signal exploitable by unit or system
EP2113896A1 (en) * 2008-04-29 2009-11-04 Radio Systèmes Ingenierie (Société Anonyme) Detection unit protected against removal and/or theft and system comprising at least one such unit.

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2602079A1 (en) * 1986-07-24 1988-01-29 Sessegolo Jean Anti-theft electrical plug
US4855719A (en) * 1986-10-07 1989-08-08 Hermetic Switch, Inc. Electrical receptable alarm switch
US4980672A (en) * 1989-10-17 1990-12-25 Generation 2, Inc. Overhead socket smoke detector with theft alarm

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2602079A1 (en) * 1986-07-24 1988-01-29 Sessegolo Jean Anti-theft electrical plug
US4855719A (en) * 1986-10-07 1989-08-08 Hermetic Switch, Inc. Electrical receptable alarm switch
US4980672A (en) * 1989-10-17 1990-12-25 Generation 2, Inc. Overhead socket smoke detector with theft alarm

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2412472A (en) * 2004-03-25 2005-09-28 Optex Co Ltd Tampering switch for security sensors
US7170403B2 (en) 2004-03-25 2007-01-30 Optex Co., Ltd. Tamper switch structure and security sensor including the tamper switch structure
GB2412472B (en) * 2004-03-25 2008-10-22 Optex Co Ltd Tamper switch structure and security sensor including the tamper switch structure
DE102005062492A1 (en) * 2005-12-27 2007-07-12 Albrecht Jung Gmbh & Co. Kg Electrical/electronic installation device for building system engineering, has screw attached to stud that comes in contact with contact positions of printed circuit board, where contact positions are in connection with alarm device
DE102005062492B4 (en) * 2005-12-27 2007-10-31 Albrecht Jung Gmbh & Co. Kg Electrical / electronic installation device
FR2930666A1 (en) * 2008-04-29 2009-10-30 Radio Systemes Ingenierie Sa Detection unit for use in security, alarm and/or monitoring system, has inclinometer for measuring variation of absolute angle with respect to vertical of reference surface, and delivering measured signal exploitable by unit or system
EP2113896A1 (en) * 2008-04-29 2009-11-04 Radio Systèmes Ingenierie (Société Anonyme) Detection unit protected against removal and/or theft and system comprising at least one such unit.

Also Published As

Publication number Publication date
IT1255115B (en) 1995-10-20
DE69306158D1 (en) 1997-01-09
ITMI921036A1 (en) 1993-10-30
ES2095558T3 (en) 1997-02-16
ITMI921036A0 (en) 1992-04-30
DE69306158T2 (en) 1997-03-20
EP0568137B1 (en) 1996-11-27

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