RU2006948C1 - Alarm transmitter - Google Patents

Abstract

FIELD: protective signalling devices. SUBSTANCE: transmitter has body 1 in form of cup with bottom provided with hole, screw member 2 installed in upper part of cup and plate 3 with hole arranged in lower part of cup. Plate 3 is fixed by ring 4. Fitted in center of plate in line with its hole is polarized piezoelectric ceramic element 5 is form of hollow cylinder. Suspended on thread 6 from screw member 2 is pendulum inertia mass 7 arranged with clearance inside cylinder of piezoelectric ceramic element 5. If an attempt is made to lift or shift equipment under protection, inertia mass 7 changes its position and, striking against inner wall of piezoelectric ceramic element 5, converts mechanical energy into electric energy by means of piezoelectric ceramic element. EFFECT: enhanced reliability of protection. 1 dwg

Description

 The invention relates to signaling devices that are triggered by an attempt to raise or move movable objects, and can be used to signal theft, breaking or tampering, for example, ammunition boxes, with small arms and other property.

 A device for signaling theft, comprising a housing, first and second contact sensors, an acoustic transducer, a power source, a third contact sensor made in the form of a metal clamp bracket and a metal plate that are installed in the housing, a switch made in the form of a normally closed spring contact , between the springs of which an insulating key is installed, the first and second contact sensors are made in the form of reed switches with a permanent control magnet, the first reed switch is made with a lock by the contacting and the second with disconnecting contacts, the first conclusions of the first, second and third contact sensors are combined and connected through a switch to one output of the power source, the other output of which is connected through the acoustic transducer to the second conclusions of the first, second and third contact sensors, a permanent control magnet located at the security facility.

 The disadvantages of the device for signaling theft are the aging of the control magnet (loss of magnetic properties) during operation, as well as very frequent cases of “sticking” of the contacts of the reed switches of the first and second sensors.

 The closest in technical essence to the proposed one is a magnetic device for signaling theft of an object containing a permanent magnet and a casing in which at least two magnetic switches are connected in series, which open when the permanent magnet approaches, and in the opposite case they are closed. A power source and an alarm unit are connected in series with the magnetic switches, which, when all the switches are closed, produces a signal.

 The disadvantages of the magnetic alarm device are frequent cases of sticking of the contacts of the magnetic switches, aging of the permanent magnet during operation (loss of magnetic properties), and the fact that batteries or galvanic cells that have a limited service life are used as a power source.

 A screw element, a plate with a hole and a lock ring are introduced into the security alarm sensor, while the body is made in the form of a cap with a bottom, in which a hole is made with a plate placed in it, fixed by a lock ring, the fixed element of the sensitive unit is made in the form of a polarized hollow cylinder piezoceramic material, plates are placed on the ends of the cylinder, the cylinder is placed on the plate coaxially with its hole, the movable element of the sensing assembly is made in the form of a pendulum, the thread of which is connected on the screw member and the inertial mass is located in the inner diameter of the cylinder, which are electrode sensor outputs.

 The drawing shows a sensor in section.

 The sensor comprises a housing 1 in the form of a cap with a bottom in which there is a hole, a screw element 2 mounted in the upper part of the cap, in the lower part of which there is a plate 3 with a hole fixed by a ring 4, while the center of the plate is aligned with its hole using soldering or gluing conductive glue installed polarized piezoceramic element 5 in the form of a hollow cylinder. The inertial mass 7 of the pendulum, which is placed with a gap in the inner diameter of the cylinder of the piezoelectric element 5, is suspended from the screw element 2 by means of thread 6. The hole in the plate 3 is used for visual observation when setting the inertial mass of the 7 pendulum.

 The alarm sensor works as follows.

 The sensor in the initial position is installed on the horizontal plane of the subject to be protected.

 After the sensor is installed in its initial position when trying to lift, tilt or shift the object on which the sensor is mounted, the inertial mass 7 fixed on the end of the string 6 of the pendulum changes its position and hits the inner wall of the polarized piezoceramic element 5, as a result of which the piezoceramic material physical properties to convert mechanical energy into electrical energy on the plates of a polarized piezoceramic element a signal appears. (56) U.S. Patent No. 4,584,571, cl. G 08 B 13/14, 1983.

Claims (1)

 SECURITY ALARM SENSOR, comprising a housing in which a sensing assembly is located, made in the form of a movable and fixed elements with the possibility of their interaction, characterized in that a screw element, a plate with a hole and a retaining ring are inserted into it, the housing is made in the form of a cap with a bottom, in which a hole is made in which a plate is mounted, fixed by a locking ring, the fixed element of the sensing assembly is made in the form of a hollow cylinder made of polarized piezoceramic material, at the ends of cylinders are placed, the cylinder is placed on the plate coaxially with its hole, the movable element of the sensing unit is made in the form of a pendulum, the thread of which is connected to the screw element, and the inertial mass of the pendulum is placed in the inner diameter of the cylinder, the plates of which are the outputs of the sensor.