EP0746829B1 - Interrupteur de securite, declenchant une alarme - Google Patents

Interrupteur de securite, declenchant une alarme Download PDF

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Publication number
EP0746829B1
EP0746829B1 EP94921167A EP94921167A EP0746829B1 EP 0746829 B1 EP0746829 B1 EP 0746829B1 EP 94921167 A EP94921167 A EP 94921167A EP 94921167 A EP94921167 A EP 94921167A EP 0746829 B1 EP0746829 B1 EP 0746829B1
Authority
EP
European Patent Office
Prior art keywords
switch
switch assembly
ball
positions
magnet
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 - Lifetime
Application number
EP94921167A
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German (de)
English (en)
Other versions
EP0746829A1 (fr
EP0746829A4 (fr
Inventor
Randall Woods
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Individual
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Individual
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Publication of EP0746829A1 publication Critical patent/EP0746829A1/fr
Publication of EP0746829A4 publication Critical patent/EP0746829A4/fr
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Publication of EP0746829B1 publication Critical patent/EP0746829B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H36/00—Switches actuated by change of magnetic field or of electric field, e.g. by change of relative position of magnet and switch, by shielding
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H36/00—Switches actuated by change of magnetic field or of electric field, e.g. by change of relative position of magnet and switch, by shielding
    • H01H36/0006—Permanent magnet actuating reed switches
    • H01H36/0046—Limit switches, also fail-safe operation or anti-tamper considerations

Definitions

  • the present invention is broadly concerned with an improved magnetic switch assembly of the type used in conjunction with a security system to detect unauthorized entry through doors or windows. More particularly, it is concerned with such a switch assembly which is especially configured to defeat attempted magnetic manipulation of the switch assembly so as to permit opening of the door or window without detection thereof.
  • the switch assembly includes a pair of adjacent, first and second switch elements mountable within a stationary frame, with a shiftable ferromagnetic body disposed between the elements and movable between spaced upper and lower switch operating positions.
  • the ferromagnetic body is at least shiftable along first and second elongated paths, with each of the paths presenting a longitudinal axis having a transverse orientation with respect to the other path.
  • a magnet is mounted in the movable door or window and is oriented for effecting movement of the body upon opening of the door or window between switch operating positions. In the event that an external magnet is placed adjacent the switch elements during an attempted unauthorized entry, the ferromagnetic body is moved to the lower switch position, thereby, detecting such attempted manipulation.
  • one common switch assembly for this purpose includes a pair of magnetic reed switch elements mounted in a door or window frame, with a magnet carried by the adjacent openable door or window.
  • the magnet carried by the door or window hold the reed elements opened or closed (depending on whether the switch is of the normally opened or normally closed variety) when the door or window is closed; when the latter is opened, the reed switch elements change position.
  • These reed switches are conventionally interposed in the overall alarm circuit, so that upon unauthorized opening of the door or window, the switch operation generates an alarm signal.
  • the present invention overcomes the problems outlined above, and provides a magnetic switch assembly for detecting relative movement between first and second adjacent members such as a door or window relative to its circumscribing frame. At the same time, the switch assembly defeats attempted magnetic manipulation thereof.
  • the switch assembly of the invention includes a pair of adjacent, superposed, upper and lower switch elements for mounting on the first member (e.g., the stationary frame), with the lower switch element presenting a sloped surface.
  • the assembly further includes a shiftable, ferromagnetic body such as a ball which is disposed between the switch elements and movable along the sloped surface between spaced upper and lower switch operating positions.
  • a magnet is also provided for mounting on the second member (e.g., the movable door or window) and is oriented for retaining the ferromagnetic body in its upper switch operating position when the first and second members are in one relative position (e.g., the door or window being closed).
  • the body upon movement of the first and second members to a different position (e.g., the door or window being opened), the body is permitted to shift along the sloped surface to the lower switch operating position where it is retained under the influence of gravity.
  • the switch elements are located within the first member for movement of the ferromagnetic body from the upper to the lower switch operating positions, when the members are in the first relative position and an external magnet is applied to the second member in an attempt to magnetically manipulate and defeat the switch assembly.
  • the switch elements are each of concavo-convex configuration, and are generally circular in plan. these switch elements are adapted for respective electrical coupling via wire leads into an overall alarm system.
  • the switch assembly of the invention may be configured as normally opened or normally closed.
  • a normally open switch assembly may included a lower switch element presenting an uppermost convex surface, while the adjacent surface of the upper element is concave; the ferromagnetic ball is adapted in the upper position thereof to rest upon the apex of the lower convex surface, in spaced relationship to the adjacent concavo-convex switch element.
  • the upper surface of the lower element is again convex, and the adjacent lower surface of the upper element is also convex, but oppositely diverging.
  • the ferromagnetic ball in the upper position thereof contacts both of the switch elements, thus closing the switch.
  • a housing including marginal wall structure defining a cavity having spaced apart first and second electrical contacts, and a shiftable ferromagnetic ball or element retained within the cavity.
  • the ferromagnetic element is shiftable between a first position where it simultaneously engages the first and second contacts, and a plurality of second positions where the element is disengaged from the first and second contacts. Additionally, the ferromagnetic element is shiftable along first and second elongated paths of travel each presenting a longitudinal axis; the longitudinal axis of the first or second paths each having a transverse orientation relative to the other path.
  • the switch assembly of the invention may be readily interposed within an overall intruder alarm system, the latter including an alarm circuit for detecting the opening of a door or window.
  • the described electrical leads are connected within the system, so that upon attempted forced opening of the door or window, with or without use of an external magnet, the alarm will activate.
  • the assembly 10 includes an uppermost synthetic resin housing 12 adapted for mounting within a stationary door or window frame 14, as well as a mating synthetic housing 16 which is positioned within the movable door 18.
  • the door 18 is of the conventional type, and is mounted on hinges 20 for movement between a closed position and a door opened position.
  • the upper housing 12 includes a pair of adjacent, superposed, upper and lower switch elements 22, 24, each of generally circular, disc-like, concavo-convex configuration.
  • the lower element 24 presents an uppermost convex surface 26, whereas the adjacent element 22 has a concave lower surface 28 in facing relationship to the surface 26.
  • a pair of electrical leads 30, 32 are respectively electrically connected with the upper and lower switch elements 22, 24 as shown.
  • a ferromagnetic ball 34 is positioned between the switch elements 22, 24 and is movable between an uppermost rest position illustrated in bold lines in Fig. 2, to a lower, switch closing position depicted in phantom. In the latter position, it will be observed that the ball 34 comes into electrical, switch-closing contact with the elements 22, 24 in the lower position thereof.
  • the lower housing 16 includes a magnet 36 which is strategically oriented so that, when the door 18 is closed as shown in Fig. 2, the magnetic field generated by the magnet 36 causes the ball 34 to be retained in the upper, switch open position thereof.
  • the switch assembly 10 is adapted for mounting within and as a part of an alarm system 38.
  • the latter includes an alarm control assembly 40 as well as an alarm bell 42 or other perceptible alarm device.
  • the electrical leads 30, 32 are used to interpose the switch assembly 10 within the system 38.
  • the alarm system 38 is armed, any attempted opening of door 18 will close switch assembly 10, and alarm signal will be generated to ring bell 42 (or alert a central station, for example).
  • ring bell 42 or alert a central station, for example.
  • the present invention provides the earliest possible warning of attempted forced entry.
  • Fig. 3 illustrates a second embodiment of the invention which includes a normally closed switch assembly 46.
  • the upper housing 12 within frame 14 includes adjacent disc-like switch elements 48, 50.
  • the lower switch element 50 presents an uppermost concave surface 52, while the upper element 48 presents a lower concave surface 54; it will be noted that the concave surfaces 52, 54 are relatively divergent, and approach each other at the center of the discs.
  • Magnetic ball 34 positioned between the discs completes the upper portion of the switch assembly. As illustrated, in the upper position of the ball depicted in full lines, the switch is closed. When the door 18 is opened, magnet 36 serves to move the ball 34 downwardly along the sloped surface 52 to the lower switch-open position illustrated in phantom in Fig. 3. Attempted magnetic manipulation of the assembly 46 via external magnet 44 is also defeated in this embodiment. That is, the presence of external magnet 44 simply pulls ball 34 to its lower position, and allows the overall alarm system 38 to appropriately activate and react.
  • Fig. 6 depicts a third embodiment of the invention where like numbering is retained for identical components with respect to the Fig. 3 embodiment.
  • the third embodiment includes a normally closed switch assembly 56 having metallic upper switch element 58, downwardly sloping concavo-convex lower metallic switch element 60, dielectric coupling ring 62, and steel ball 34.
  • Upper element 58 forms a cylindrical well defined by horizontally extending bottom member 64 and vertical wall 66.
  • Lower element 60 includes a downwardly sloping concavo-convex bottom wall 68 bounded by vertical side wall 70.
  • dielectric coupling 62 presents an annular structure holding elements 58 and 60 in a concentric relationship.
  • Coupling 62 may be formed of neoprene rubber, synthetic resin, or similar insulative material. Additionally, ring 62 may be adhered to elements 58 and 60, or may be compressed to frictionally engage the elements. In this manner, ferromagnetic ball 34 may be positioned within peripheral zone 72 of opening 74 formed between elements 58 and 60.
  • Ball 34 is depicted in a first position of electrical contact bridging opposed elements 58 and 60, and may be shifted along numerous transversely oriented elongated paths, e.g., paths P1 and P2, towards a plurality of second positions, e.g., position 76 and 78 where ball 34 is no longer in simultaneous electrical contact with elements 58 and 60.
  • FIG. 8 depicts relief feature 80a, which is a right-angle corner similar to relief feature 80 except that wall 68 is positioned relatively closer to wall 64 which causes ball 34 to engage wall 66, not apex 82.
  • Fig. 9 depicts yet another relief feature 80b which includes an arcuate ball-engaging contour at the lower portion of circular vertical wall 66.
  • Fig. 10 depicts yet another relief feature 80c, which includes a 45° ball-engaging bevel at the lower portion of circular vertical wall 66.
  • switch assembly 58 is mounted in the manner previously described with a magnet, such as magnet 36, positioned in a door below the switch and proximal to the center portion thereof.
  • the magnet serves to attract and hold ball 34 in continuous electrical contact with wall 68 and the various relief features, e.g., feature 80. If the door is opened, magnet 36 is pulled away from the switch 56 to release ball 34 from its first position of simultaneous contact with elements 58 and 60, after which ball 34 rolls down sloped wall 68 along a path of travel, e.g., P2, towards one of the second positions where ball 34 is disengaged from contacts 58 and 60 to break the electrical contact and set off an alarm. Similarly, in the event that external magnetic forces are applied to manipulate ball 34 in an attempt to defeat the alarm circuit, ball 34 may be shifted along another path such as paths P1 or P2 to one of the second positions 76 or 78; thereby activating an alarm.
  • the various relief features 80, 80a, 80b, and 80c are particularly preferred for various reasons.
  • the open peripheral zone 72 provides space for ball 34 to move therein without risking the ball becoming stuck between walls 64 and 68 in the narrowed central region.
  • Relief feature 80 presents a sharp apex 82, which tends to provide a relatively sharp surface forming a better electrical contact between apex 82, ball 34 and wall 68.
  • Feature 80a does not utilize sharp corner 82 to enhance the electrical contact, but merely presents wall 66 as an abutment to exclude ball 34 from the central narrowed region between walls 64 and 68.
  • Feature 80b excludes ball 34 from the central narrowed region in a similar manner, as does feature 80c.
  • Fig. 11 depicts a fourth embodiment of the invention where like numbering is retained for identical components with respect to the Fig. 6 embodiment.
  • Switch 84 includes a first chamber-defining switch element 86; ball 34; and a second, flexible switch element 88.
  • First switch element 86 includes a substantially flat, circular metallic upper disk 90 having a central aperture 92 for receiving element 88 (see Figs. 11 and 13), and an outer lip 94 at its outer radius.
  • Element 86 also includes a bottom portion 96 having a central, circular, disk-like, concavo-convex, bottom wall 98 presenting an uppermost downwardly sloping surface 100, and a cylindrical vertically rising side wall 102 integrally formed with wall 98 and having a radius sufficient to fit within lip 94.
  • Wall 102 and lip 94 may have a solder connection to form a closed interior chamber 104 for holding ball 34.
  • Element 86 may be connected at any point on the exterior thereof with an electrical lead (not depicted) for incorporating switch 84 into an electrical alarm system.
  • Second switch element 88 includes conductive lead 106, which may be connected with the wiring of an electrical alarm system, and is electrically coupled with spring steel rod 108.
  • Rod 108 extends into chamber 104 a sufficient distance to contact ball 34 in a first position simultaneously bridging a gap between rod 108 and wall 98, as depicted in Fig. 12.
  • Rod 108 is held by mounting bracket 110 having a lowermost tubular portion 112 sized to be received within aperture 92, and presenting a central aperture 114 for receiving rod 108.
  • Lower portion 112 is integrally formed with upper portion 116 having an increased radiant diameter and continuing aperture 114 for receiving rod 108.
  • Circular rubber grommet 115 frictionally retains bracket 110 within aperture 92.
  • Fig. 13 depicts ball 34 having a central first position 118 simultaneously bridging the gap between rod 108 and surface 100, and a plurality of alternative positions, e.g., 120 and 122, where ball 34 is disengaged from contact with rod 108.
  • ball 34 may travel along one of paths P3 and P4, each presenting an axis of elongation having a transverse orientation with respect to the other path and traveling towards a plurality of second positions, e.g., 120 and 122, at the outer perimeter of switch 84 where ball 34 is disengaged from contact with rod 34 and surface 100.
  • an external magnet e.g., magnet 36
  • ball 34 may travel along one of paths P3 and P4, each presenting an axis of elongation having a transverse orientation with respect to the other path and traveling towards a plurality of second positions, e.g., 120 and 122, at the outer perimeter of switch 84 where ball 34 is disengaged from contact with rod 34 and surface 100.
  • switch 84 is mounted above a door in the manner depicted in Fig. 1, with magnet 36 centrally positioned beneath switch 84.
  • magnet 36 pulls ball 34 into contact with rod 108, which may flex responsively as depicted in Fig. 12.
  • the alarm circuit is closed to indicate that the door is shut.
  • ball 34 may roll along one of exemplary paths P3 and P4 down surface 100 to one of the extreme outer second positions 120 and 122 shown in Fig. 11, thus breaking the closed circuit to indicate that the door is open.
  • Fig. 14 depicts a fifth embodiment of the invention where like numbering has been retained for identical components with respect to the Fig. 11 embodiment.
  • Switch 124 may be mounted for use at the side of a window, and includes a closed cylindrical shell 126 coupled with switch element 88 as previously described.
  • shell 126 includes a tubular side wall 128 having aperture 130 for receiving switch assembly 88, top wall 132, and bottom wall 134, which combine to form a closed interior chamber 136 for retaining ball 34.
  • Element 88 is received within wall 128 in a manner which is identical to that described for disk 90 of the Fig. 11 embodiment, except rod 108 extends into chamber 136 in a horizontal orientation.
  • Ball 34 is depicted (Fig. 16) in a first position of electrical contact bridging the gap between rod 108 and wall 128, but may travel along paths P5, P6, and P7.
  • Path P5 (Fig. 14) travels along a width dimension W of sufficient dimension to allow vertical passage of ball 34 between rod 108 and wall 128 along elongated paths P6 and P7 each having transverse orientations with respect to path P5.
  • switch 124 may be mounted within an upright wall, such as wall 138 proximal to window 140 (see Fig. 15), which holds magnet 142.
  • Fig. 16 depicts ball 34 in a first position simultaneously contacting wall 128 and rod 108 to form a closed circuit where magnet 142 retains ball 34 in a position to indicate that the window is closed.
  • Fig. 17 depicts ball 34 having fallen with the force of gravity along downward path P7 upon the removal of magnet 142 from the proximity of wall 128 to open the circuit, thus, indicating that the window has been raised.
  • ball 34 may shift along path P5 to disengage from simultaneous contact with rod 108 and wall 128, thereby triggering an alarm.
  • Fig. 18 depicts a final embodiment including switch assembly 144, switch element 88, switch element 146, magnet 148, and magnet 150, where like numbering has been retained with respect to the Fig. 14 embodiment.
  • Switch element 88 is constructed as previously described.
  • Switch element 146 is a cylindrical shell having end walls 152 and 154 connected by tubular sidewall 156 to form interior chamber 158 for retaining ball 34.
  • a top wall 156 is apertured to receive switch element 88 as previously described.
  • Element 146 is identical to shell 126, except that 146 is designed for installation with rod 108 in a vertical position.
  • Switch assembly 144 is designed for horizontal installation, with switch elements 88 and 146 preferably being positioned in the uppermost portion of a door jam.
  • Magnet 148 is preferably placed in the door at a position that will be aligned directly underneath switch element 88 when the door is closed. Magnet 148 is larger than magnet 150, and will pull ball 34 away from magnet 150 towards a central first position contacting switch elements 88 and 146 to close the electrical circuit when the door is closed.
  • magnet 148 is removed from proximity with ball 34, and magnet 150 pulls ball 34 away from element 88, thus opening the circuit in the position depicted in Fig. 19 to indicate that the door is open.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Burglar Alarm Systems (AREA)
  • Alarm Systems (AREA)
  • Switches That Are Operated By Magnetic Or Electric Fields (AREA)
  • Switches Operated By Changes In Physical Conditions (AREA)

Claims (10)

  1. Ensemble d'interrupteur magnétique pour détecter un déplacement relatif entre des premier et second éléments adjacents et pour faire échouer une tentative de manipulation magnétique de l'ensemble d'interrupteur au moyen d'un aimant externe, comprenant:
    des moyens formant interrupteur destinés à être monté sur l'un desdits éléments et incluant
    un boítier supportant une paire d'éléments de commutation espacés;
    un corps ferromagnétique situé dans ledit boítier et déplaçable dans ce dernier entre une première position de commutation fermée, dans laquelle ledit corps est simultanément en contact avec ladite paire d'éléments de commutation espacés, et une seconde position de commutation ouverte, dans laquelle ledit contact simultané n'existe pas avec ledit corps; et
    des moyens pour solliciter ledit corps ferromagnétique dans l'une desdites première et seconde positions; et
    un premier élément destiné à être monté sur ledit second élément et orienté de manière à retenir ledit corps ferromagnétique à l'encontre de la sollicitation dudit moyen de sollicitation dans l'autre desdites première et seconde position lorsque les premier et second éléments sont adjacents de façon relative,
    lesdits moyens de polarisation pouvant être actionnés de manière à déplacer ledit corps pour l'amener dans l'une desdites première et seconde positions lors d'un déplacement relatif entre les premier et second éléments,
    lesdits moyens de commutation étant configurés pour changer d'état pour déclencher une alarme si un aimant externe est déployé en vue de manipuler l'ensemble d'interrupteur.
  2. Ensemble d'interrupteur selon la revendication 1, lesdits moyens de sollicitation comprenant un second aimant monté sur ledit premier aimant au voisinage dudit boítier.
  3. Ensemble d'interrupteur magnétique pour détecter un déplacement relatif entre des premier et second éléments adjacents, et pour empêcher une tentative de manipulation magnétique du dispositif d'interrupteur de manière à permettre ledit déplacement relatif sans détection de ce dernier, ledit ensemble d'interrupteur comprenant:
    un boítier destiné à être monté sur ledit premier élément et comprenant une structure de paroi marginale latérale définissant une cavité, un premier contact électrique disposé dans ladite cavité entre des parties opposées de ladite structure de paroi marginale latérale, et un second contact électrique distant dudit premier contact;
    un élément ferromagnétique déplaçable situé dans ladite cavité du boítier et configuré pour venir en contact simultanément avec des premier et second contacts pour présenter une première position de commutation;
    une cavité du boítier étant configurée de manière à permettre le déplacement dudit élément depuis ladite première position de commutation pour venir dans une pluralité de secondes positions de commutation, dans lesquelles l'élément est simultanément écarté desdits premier et second contacts, ledit élément étant déplaçable entre lesdites première et seconde positions de commutation le long au moins desdits premier et second trajets allongés de déplacement présentant chacun un axe longitudinal, les axes longitudinaux desdits premier et second trajets étant transversaux l'un par rapport à l'autre;
    des moyens magnétiques destinés à être montés sur ledit second élément pour retenir ledit élément dans l'une desdites première et seconde positions d'actionnement de l'interrupteur, lorsque les premier et second éléments sont fixes de façon relative dans une position désirée, et lors du déplacement relatif entre des premier et second éléments, permettre que ledit élément se déplace le long dudit premier trajet de déplacement jusqu'à l'autre desdites positions de fonctionnement de l'interrupteur;
    ledit boítier et ledit élément étant configurés en coopération pour permettre le déplacement de l'élément le long dudit second trajet vers l'autre position d'actionnement de l'interrupteur, lorsque les premier et second éléments sont dans ladite position désirée et qu'une tentative est faite pour manipuler magnétiquement l'ensemble d'interrupteur, en empêchant de ce fait ladite tentative de manipulation magnétique.
  4. Ensemble d'interrupteur selon la revendication 3, dans lequel ladite structure de paroi marginale latérale inclut une boíte rectangulaire.
  5. Ensemble d'interrupteur selon la revendication 3, dans lequel ledit corps ferromagnétique déplaçable inclut une sphère d'acier.
  6. Ensemble d'interrupteur selon la revendication 3, dans lequel ledit premier contact électrique inclut un relais à lame métallique flexible.
  7. Ensemble d'interrupteur selon la revendication 6, dans lequel ledit second contact électrique inclut une surface inclinée vers le bas située sur ladite structure de paroi marginale latérale.
  8. Ensemble d'interrupteur selon la revendication 7, comprenant ladite première partie située au centre de ladite surface inclinée vers le bas, et lesdites secondes positions situées extérieurement en étant écartées par rapport audit centre.
  9. Ensemble d'interrupteur selon la revendication 3, dans lequel ledit premier contact électrique inclut un premier relais à lame métallique, ledit second électrique inclut un second relais à lame métallique possédant une surface inclinée vers le bas.
  10. Ensemble d'interrupteur selon la revendication 9, dans lequel ledit premier relais à lame métallique inclut une butée pour empêcher que ledit corps se décale vers une position centrale entre lesdits premier et second relais à lame.
EP94921167A 1994-02-23 1994-04-07 Interrupteur de securite, declenchant une alarme Expired - Lifetime EP0746829B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US20014394A 1994-02-23 1994-02-23
US200143 1994-02-23
PCT/US1994/003818 WO1995023392A1 (fr) 1994-02-23 1994-04-07 Interrupteur de securite, declenchant une alarme

Publications (3)

Publication Number Publication Date
EP0746829A1 EP0746829A1 (fr) 1996-12-11
EP0746829A4 EP0746829A4 (fr) 1998-09-16
EP0746829B1 true EP0746829B1 (fr) 2003-06-18

Family

ID=22740515

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94921167A Expired - Lifetime EP0746829B1 (fr) 1994-02-23 1994-04-07 Interrupteur de securite, declenchant une alarme

Country Status (6)

Country Link
EP (1) EP0746829B1 (fr)
AT (1) ATE243352T1 (fr)
AU (1) AU682521B2 (fr)
CA (1) CA2183554C (fr)
DE (1) DE69432833T2 (fr)
WO (1) WO1995023392A1 (fr)

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Publication number Priority date Publication date Assignee Title
WO2014063496A1 (fr) * 2012-10-26 2014-05-01 北京通宇泰克科技有限公司 Terminal d'alarme antivol sans fil utilisé dans un couvercle de trou d'homme

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US5880659A (en) * 1997-03-17 1999-03-09 Woods; Randell Magnetic switch assembly for detecting unauthorized opening of doors or windows
ES2222796B1 (es) * 2003-03-25 2006-03-16 Francisco Calle Calderon Sistema de alarma mediante detector de apertura en rejas de seguridad, puertas y ventanas.
FR3016962A1 (fr) * 2014-01-29 2015-07-31 Jean Paul Igougne Dispositif de detection et de signalisation de fuites dans un reseau d'alimentation en eau
CN110772807B (zh) * 2019-12-04 2024-06-28 湖南贝尔动漫科技有限公司 车载运动玩偶

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US5332992A (en) * 1993-04-06 1994-07-26 Randall Woods Security alarm switch

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014063496A1 (fr) * 2012-10-26 2014-05-01 北京通宇泰克科技有限公司 Terminal d'alarme antivol sans fil utilisé dans un couvercle de trou d'homme

Also Published As

Publication number Publication date
EP0746829A1 (fr) 1996-12-11
EP0746829A4 (fr) 1998-09-16
AU682521B2 (en) 1997-10-09
ATE243352T1 (de) 2003-07-15
CA2183554A1 (fr) 1995-08-31
DE69432833T2 (de) 2003-12-04
DE69432833D1 (de) 2003-07-24
WO1995023392A1 (fr) 1995-08-31
AU7199194A (en) 1995-09-11
CA2183554C (fr) 2003-07-01

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