JPH0517751Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a theft alarm device for vehicle accessories.

BACKGROUND OF THE INVENTION Retrofitted vehicle accessories such as car stereos and car radios are easily removed from the vehicle, so there is a high risk of theft. For this reason, a theft alarm device has been developed that prevents theft by issuing an alarm when the above-mentioned vehicle accessories are removed from the automobile. The above-mentioned theft alarm device generally consists of an alarm, an electromagnetic switch that controls the operation of the alarm, and movement detection means that detects movement of vehicle equipment, and the vehicle equipment is located at the location where the vehicle equipment is installed. When the robot is moved from the vehicle, the electromagnetic switch is operated by the movement detection means to activate the alarm.
Incidentally, as the above-mentioned theft alarm device, there is, for example, a theft alarm device for vehicle accessories disclosed in Japanese Utility Model Application Publication No. 54-1388.

Problems to be Solved by the Invention If a car is equipped with a theft alarm device configured as described above, it is possible to notify that a vehicle accessory has been stolen. However, with this type of theft alarm system, by the time the theft alarm system activates and issues an alarm, the vehicle accessories have already been removed from the vehicle body, so even if the theft alarm system activates, the There was a problem that there was a high possibility that the equipment would be taken away, and that the anti-theft effect was insufficient.

Measures to Solve the Problem The burglar alarm device has a pressure sensing conductive rubber which becomes non-conductive when no external pressure is applied and becomes conductive when pressure above a set value is applied, and the pressure applied to the pressure sensing conductive rubber. The pressure-sensing conductive rubber is inserted between a bracket on the vehicle equipment side and a bracket on the vehicle body side, which are fastened with mounting bolts. This is what I did.

Function As mentioned above, by inserting the pressure-sensitive conductive rubber between the bracket on the vehicle equipment side and the bracket on the vehicle body side, when the mounting bolt is loosened to remove the vehicle equipment from the vehicle body, the theft alarm system is activated. is made to work.

Embodiment FIG. 1 is a block diagram showing the configuration of the theft alarm device according to the present invention. In the figure, 1 is in a non-conducting state when no external pressure is applied, and becomes a conducting state when an external pressure higher than a set value is applied. pressure sensitive conductive rubber,
2 is a door key switch which is turned off when the door lock mechanism is locked and turned on when the door lock mechanism is unlocked with the door key. 3 is a controller for operating an alarm device 4 such as a buzzer when the pressure sensing conductive rubber 1 is in a non-conducting state and the door key switch 2 is in an OFF state; 5 is a power source for the controller 3 and the alarm device 4; It's a complete failure. The controller 3 has an AND circuit 6
and a relay 8 which is turned ON for a preset time via a timer and buffer circuit when the output of the AND circuit 6 becomes H level. One input terminal of the AND circuit 6 is grounded via the door switch 2, and the other input terminal is grounded via the pressure sensing conductive rubber 1. Further, the alarm device 4 is connected to the battery 5 via a relay contact 8a of a relay 8. When equipping a car with a theft alarm system having the above configuration, the pressure-sensitive conductive rubber 1 is configured in a cylindrical shape as shown in FIG. Insert between bracket B formed on item A and bracket C provided on the vehicle body side. Then, when both brackets B and C are fastened with mounting bolts D to fix the vehicle accessory A in a predetermined position on the vehicle body, a pressure greater than a set value is applied to the pressure sensing conductive rubber 1.

In the above configuration, when the vehicle equipment A to which the pressure-sensing conductive rubber 1 of the theft alarm device according to the present invention is assembled is accurately attached to the vehicle body, the pressure-sensing conductive rubber 1 has a set value. Since the above pressure is applied, the pressure sensing conductive rubber 1 is in a conductive state. Therefore, in this state, the input terminal on the pressure sensing conductive rubber side of the AND circuit 6 is at L level.
Regardless of the level of the input terminal on the door key switch 2 side, the output of the AND circuit 6 will be at L level, and the alarm 4 will not operate. In addition, if a third party intentionally removes vehicle equipment A from the vehicle and pry open the door without using the door key when the door lock mechanism is locked, the door key switch 2 will remain in the OFF state even if the door is open. The input terminal of the AND circuit 6 on the door key switch side becomes H level. In this state, in order to further remove the vehicle equipment A from the vehicle body, a third party loosens the mounting bolt D that fastens the brackets B and C provided on both, and the pressure applied to the pressure sensing conductive rubber 1 increases to the set value. As a result, the pressure sensing conductive rubber 1 becomes non-conductive. Therefore, the input terminal of the pressure sensing conductive rubber side of the AND circuit 6 also becomes H level, and the output of the AND circuit 6 becomes H level, so the timer &
Relay 8 is activated only for the time set in buffer circuit 7.
When the alarm is turned on and the alarm 4 is activated, an alarm is issued. When the user removes the vehicle equipment A from the vehicle body, he unlocks the door lock mechanism using the door key, turns on the door key switch 2, and sets the input terminal on the door key switch side of the AND circuit 6 to the L level. In order to perform removal work, vehicle equipment A
Even if the pressure sensing conductive rubber 1 becomes non-conductive by loosening the mounting bolt D during removal, the alarm 4 will not operate.

Effects of the invention As mentioned above, the theft alarm device according to the invention has the following features:
Insert the pressure-sensitive conductive rubber between the bracket on the vehicle equipment side and the bracket on the vehicle body side, and loosen the mounting bolts that fasten both brackets to remove the vehicle equipment from the vehicle body. Since the alarm is activated, if the vehicle accessory is stolen, the alarm can be activated while the vehicle accessory is being removed from the vehicle body, and the theft prevention effect can be improved. Furthermore, by inserting a pressure-sensitive conductive rubber between the bracket on the vehicle equipment side and the bracket on the vehicle body side, it is effective to prevent abnormal noises generated between the two brackets due to vibrations during driving.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the structure of a theft alarm system for vehicle accessories according to the present invention, and FIG. 2 is a perspective view showing an example of mounting a pressure-sensitive conductive rubber. 1...Pressure sensing conductive rubber, 3...Controller, 4...Alarm, A...Vehicle equipment, B, C
...Bracket, D...Mounting bolt.

Claims (1)

[Scope of utility model registration request] When no external pressure is applied, it becomes non-conducting,
It consists of a pressure-sensing conductive rubber that becomes conductive when a pressure above a set value is applied, and a controller that activates an alarm when the pressure applied to the pressure-sensing conductive rubber falls below the set value, and the pressure-sensing conductive rubber is installed. A theft alarm device for a vehicle accessory, characterized in that it is inserted between a bracket on the vehicle accessory side and a bracket on the vehicle body side, which are fastened with bolts.