WO1991002337A1 - Detecteur de contact antivol - Google Patents

Detecteur de contact antivol Download PDF

Info

Publication number
WO1991002337A1
WO1991002337A1 PCT/EP1990/001269 EP9001269W WO9102337A1 WO 1991002337 A1 WO1991002337 A1 WO 1991002337A1 EP 9001269 W EP9001269 W EP 9001269W WO 9102337 A1 WO9102337 A1 WO 9102337A1
Authority
WO
WIPO (PCT)
Prior art keywords
housing
contact sensor
rear wall
sensor according
fastening screw
Prior art date
Application number
PCT/EP1990/001269
Other languages
German (de)
English (en)
Inventor
Reinhold Ott
Original Assignee
Reinhold Ott
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 Reinhold Ott filed Critical Reinhold Ott
Priority to DE90912601T priority Critical patent/DE59004784D1/de
Publication of WO1991002337A1 publication Critical patent/WO1991002337A1/fr

Links

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
    • G08B13/14—Mechanical actuation by lifting or attempted removal of hand-portable articles
    • G08B13/149—Mechanical actuation by lifting or attempted removal of hand-portable articles with electric, magnetic, capacitive switch actuation

Definitions

  • the invention relates to a contact sensor for a thief steel security device according to the preamble of claim 1.
  • Such a known contact sensor has a cylindrical housing, on the upper end face of which a screw section is formed, which can be screwed into the tripod thread of a camera.
  • the actuating part of a microswitch projects beyond the end face of the known contact sensor.
  • the lower end face of the sensor housing is provided with a tripod hole so that the unit consisting of the camera and contact sensor can be attached to a tripod head in the usual way. If an attempt is made to unscrew the camera from the contact sensor, the actuating part of the microswitch springs back out and an alarm is triggered.
  • the actuating part of the microswitch grinds on the often grained, rough underside of the camera housing when the contact sensor is screwed on and unscrewed. This can damage the microscale.
  • the present invention is therefore intended to further develop a contact sensor according to the preamble of claim 1 in such a way that it can be attached and removed without the risk of damaging the microswitch.
  • the sensor housing can remain at rest when attaching and detaching. you only needs to loosen the fastening screw to dismantle, to attach this screw only has to be screwed into the tripod thread of the camera. Since the sensor housing has the shape of a cuboid, it can easily be held in the desired orientation with the fingers while the fastening screw is turned.
  • the sensor housing is in the form of a preferably flat cuboid
  • the camera and the contact sensor together form an appealing unit, in particular if the sensor housing is injection molded from black plastic and has a surface that is similar to matt or grained as a camera housing.
  • the attached contact sensor is then perceived by the viewer as another attachment to the camera.
  • the contact sensor With the back of its housing, the contact sensor also offers a smooth, tilt-proof installation surface for the object to be protected (e.g. camera) that is firmly connected to the contact sensor.
  • the development of the invention according to claim 4 enables the unit formed by the camera and contact sensor to be attached in the usual way on a tripod head. From a mechanical point of view, the contact sensor forms an adapter part between the tripod head and the camera. This adapter part is also aesthetically pleasing due to its cuboid shape.
  • the microswitch already responds when the fastening screw is loosened, that is to say even before the fastening screw has been completely unscrewed from the tripod thread of the camera. In this way, an attempted theft can be countered at an early stage.
  • the development of the invention according to claim 8 enables the front wall of the housing to move somewhat in the direction of the camera base according to the deflection of the rear wall of the housing when the contact sensor is attached to a camera.
  • the peripheral walls of the housing serve as a rigid spacing frame over which the edge of the flexible rear wall of the housing is supported on the camera base.
  • the development of the invention according to claim 9 is in terms of a good and gentle power transmission from Head of the fastening screw on the rear wall of the housing, which can be elastically bent out when attached to a camera, is an advantage.
  • the development of the invention according to claim 11 is advantageous with regard to a particularly exact positioning of the microswitch on the rear wall of the housing, in particular independent of the guidance of connecting wires. This makes it possible to use microswitches which have a particularly small switching stroke and which are particularly sensitive to attempts at theft.
  • FIG. 1 a top view of the front of a contact sensor that can be connected to a camera, the lower half of the front wall of the housing being cut away;
  • Figure 2 a vertical section through the contact sensor of Figure 1 along the section line II-II.
  • the contact sensor shown in the drawing has a rectangular, scalene-shaped lower housing part 10 with a housing rear wall 12 and a circumferential housing side wall 14.
  • the latter has a comparison with the housing rear wall 12 large thickness, and a shoulder 16 is provided at its free edge.
  • a housing front wall 18 sits on the shoulder 16.
  • Fastening sleeves 20 projecting vertically upward are formed on the rear wall 12 of the housing, into which fastening pins 22, which are molded onto the underside of the front wall 18 of the housing, engage in a press fit.
  • the thickness of the housing front wall 18 is somewhat smaller than the depth of the shoulder 16, so that a small distance "x" remains between the top of the housing front wall 18 and the free edge of the housing side walls 14. In practice, this can be 0.2 to 0.5 mm.
  • a rectangular C-positioning wall 24 is formed on the top of the rear wall 12 of the housing, at the corners of which there are platforms 26 projecting inwards to the space delimited by the positioning wall 24.
  • the underside of a housing 28 of a microswitch designated 30 in total is seated on these.
  • the positioning wall 24 surrounds the switch housing 28 in a form-fitting manner, with a passage 32 remaining between the free ends of the legs of the C, through which wires 34, 36 (see FIG. 1) can be passed, which lead to connection threads 38 of the microswitch 30.
  • the microswitch 30 has an actuating cap 40 pointing upwards, which is biased upwards by a spring is.
  • the actuating cap 40 can protrude somewhat beyond the plane predetermined by the edge of the housing side walls 14. In Figure 2, the position of the actuating cap 40 is shown shortly before reaching the switching point. The switching point should therefore just not be reached when the contact sensor is pressed lightly against the underside of a camera.
  • a receiving sleeve 42 is formed for a fastening screw designated overall by 44.
  • the fastening screw 44 has a conical screw head 46 on the underside, to which a smooth screw shaft 48 is connected.
  • the screw shaft 48 is in turn delimited by a conical locking collar 50, and the latter is followed by a reduced diameter smooth screw section 52 and a threaded section 54.
  • the latter corresponds to the tripod thread in the camera base.
  • the inner surface of the receiving sleeve 42 is countersunk conically at the lower end, corresponding to the inclination of the screw head 46.
  • the countersink 56 is so deep that the screw head 46 can be completely accommodated in it.
  • a locking bead 58 is provided, through which the locking collar 50 of the fastening screw 44 can be pressed with the application of force. In this way, the fastening screw 44 is captively connected to the lower housing part 10, but can essentially be freely moved axially by the length of the smooth screw shaft 48.
  • the front wall of the housing has 18 shows a circular hole 60 which represents a continuous continuation of the inner surface of the receiving sleeve 42.
  • a positioning pin 62 is formed on the top of the housing front wall 18. The distance between the axis of the positioning pin 62 and the axis of the fastening screw 44 corresponds to the distance between the axis of the tripod thread and a positioning hole in the camera base. The diameter of the positioning pin 62 is provided for the smallest positioning hole of a camera that occurs in practice; for larger diameters of positioning bores, an adapter sleeve 64 can be placed on the positioning pin 62.
  • a threaded part 66 is injected into the housing rear wall 12, the thread of which corresponds to the diameter and pitch
  • Threaded section 54 of the fastening screw 44 corresponds to the tripod thread in the camera base.
  • a fastening screw of a tripod head (not shown in the drawing) can thus be screwed into this thread in the same way as into the tripod thread of a camera.
  • a positioning sleeve 68 is integrally formed on the rear wall of the housing to the side of the threaded part 66.
  • the distance between the axis of the positioning sleeve 68 and the axis of the threaded part 66 corresponds to the distance between the axes of the positioning pin 62 and the fastening screw 44.
  • bushings 70 are provided for two-core cables. These cables are indicated schematically by their conductors.
  • Conductors 72 and 74 are used to connect the contact sensor to a monitoring center.
  • the conductor 72 leads to one terminal of the microswitch 30.
  • the other terminal of the microswitch 30 is connected via a further conductor 76 to a further contact sensor 78, which if it contains a microswitch and is glued, for example, to an expensive detachable part of the camera (lens or monitor).
  • Another conductor 80 leads from the contact sensor 78 to a further contact sensor 82, by means of which a camera part is likewise separately secured.
  • a conductor 84 leads from the contact sensor 82 to the conductor 74.
  • the microswitch 30 and the microswitches contained in the secondary contact sensors 78, 82 are thus connected in series. If even one of the contact sensors is removed from the camera, an alarm is triggered.
  • the entire housing is first placed against the underside of the camera, the actuating cap 40 occupying the position shown in FIG. 2, in which alarm conditions still exist.
  • the fastening screw 44 By tightening the fastening screw 44, the housing rear wall 12 is then bent upwards, and due to the height of the shoulder 16 described above, the housing front wall 18 can follow the bending movement.
  • the actuating cap 40 With the corresponding deformation by in practice 0.2 to 0.5 mm, the actuating cap 40 is then moved further into the switch housing 28, and the switching point of the microswitch 30 is then exceeded during this movement. Only now are there no more alarm conditions.
  • the contact sensor Since the contact sensor is fixed in a rotationally fixed manner on the underside of the camera via the positioning pin 62, one has to have access to the head of the fastening screw 44 in order to remove the contact sensor; you cannot unscrew the camera directly from the housing of the contact sensor.
  • the head of the fastening screw 44 is in turn covered when the contact sensor carrying the camera is screwed onto a tripod head. The loosening of the mechanical connection between the contact sensor and the camera is thus time-consuming.
  • the underside of the rear wall 12 of the housing represents a flat, large supporting surface, via which a camera provided with the contact sensor can be placed perfectly on a flat surface.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Burglar Alarm Systems (AREA)

Abstract

Un détecteur de contact antivol pour appareils photographiques comporte un boîtier parallélépipédique plat (10 à 14, 18). L'élément de commande (40) d'un microrupteur (30) monté sur la paroi arrière du boîtier passe à travers la paroi avant (18) de ce boîtier. La paroi arrière (12) du boîtier est élastique et la tête (46) d'une vis de fixation (44) qui passe à travers le boîtier du détecteur s'applique au voisinage du centre de ladite paroi arrière.
PCT/EP1990/001269 1989-08-10 1990-08-02 Detecteur de contact antivol WO1991002337A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE90912601T DE59004784D1 (de) 1989-08-10 1990-08-02 Kontaktsensor für diebstahlsicherung.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE8909596U DE8909596U1 (de) 1989-08-10 1989-08-10 Kontaktsensor für eine Diebstahlsicherung
DEG8909596.0U 1989-08-10

Publications (1)

Publication Number Publication Date
WO1991002337A1 true WO1991002337A1 (fr) 1991-02-21

Family

ID=6841841

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP1990/001269 WO1991002337A1 (fr) 1989-08-10 1990-08-02 Detecteur de contact antivol

Country Status (3)

Country Link
EP (1) EP0437590B1 (fr)
DE (2) DE8909596U1 (fr)
WO (1) WO1991002337A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2298144A1 (fr) * 1975-01-15 1976-08-13 Agostini Sa Detecteur d'effraction
US4149158A (en) * 1976-05-11 1979-04-10 Pioneer Electronic Corporation Security system for CATV terminal
GB2091922A (en) * 1981-01-27 1982-08-04 Automated Security Holdings Alarm bell assembly
DE8805281U1 (de) * 1988-04-21 1989-04-13 Zander, Hans, 4836 Herzebrock Sicherungsadapter

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2298144A1 (fr) * 1975-01-15 1976-08-13 Agostini Sa Detecteur d'effraction
US4149158A (en) * 1976-05-11 1979-04-10 Pioneer Electronic Corporation Security system for CATV terminal
GB2091922A (en) * 1981-01-27 1982-08-04 Automated Security Holdings Alarm bell assembly
DE8805281U1 (de) * 1988-04-21 1989-04-13 Zander, Hans, 4836 Herzebrock Sicherungsadapter

Also Published As

Publication number Publication date
DE59004784D1 (de) 1994-04-07
EP0437590A1 (fr) 1991-07-24
EP0437590B1 (fr) 1994-03-02
DE8909596U1 (de) 1989-11-16

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