JPS6051278A - Anti-theft apparatus for automobile - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an anti-theft device for an automobile provided on an automobile door or a first rank lid.

Conventionally, locking a door or trunk lid with a key is safe from theft, but it is possible to prevent theft from occurring through acts of fraud such as removing the rotor of the lock. The disadvantage is that it cannot be done.

Therefore, the applicant has proposed an anti-theft device for automobiles in order to solve the above-mentioned problems in Japanese Patent Application No. 199714/1983. Japanese Patent Application No. Sho 57-199714 is constructed as shown in FIGS. 1 and 2. That is, when the cylinder lock C is pulled out from the switch housing A due to an unauthorized unlocking input, the advancing/retracting rod B advances due to the bias of the spring 14, and the magnet 15 acts as a trigger for the removal detection reed switch 1.
Move to position 6. At this time, the removal detection reed switch 16 is closed, so the alarm device is not activated and the alarm does not sound.

In addition, if the cylinder lock C is displaced and released with a screwdriver or the like without using a regular key and the door etc. is opened, the magnet 20 fixed to the drive cam 19 does not move, so the switch housing A is not opened. The detection reed switch 5 is not closed. In this state, when a door or trunk lid is opened, the open/close detection switch is closed and the alarm device is activated to sound an alarm.

However, since the conventional example uses a magnetic sensing switch as a means of detecting unauthorized unlocking, if a strong magnet is brought close to the magnetic sensing switch, the magnetic sensing switch may malfunction, making it impossible to prevent unauthorized unlocking. there were.

The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to prevent malfunction of an automobile anti-theft device. In order to achieve this object, the present invention provides an anti-theft device that is attached to a cylinder lock and has a σ air sensing switch, in which a malfunction prevention magnetic sensing switch having characteristics opposite to those of the magnetic sensing switch is attached to the magnetic sensing switch. The configuration was such that they were connected in series.

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

In FIGS. 3 to 5, C is a cylinder lock on which a rotor 2 is rotatably provided. A lever L for locking and driving the H lock is provided at the inner end of the rotor 2. A magnet 20 is provided on the drive cam 19 of the lever L seat, and it comes into contact with and separates from the normally open unlock detection reed switch 5 (magnetic sensing switch) installed in the switch housing A1, and when the lever L is unlocked, Then, the reed switch 5 is closed.

Further, in the part of the switch housing Ar that protrudes to one side of the cylinder lock 1, a movable advance/retract lever B is provided with one end forcefully abutting against the rotor 2 by means of a spring ring 14.Inside the switch housing Al There is a normally open reed switch 16 (magnetic sensing switch) for detecting rotor removal.
is provided, and when the rotor 2 is unlocked and removed, the magnet 15 approaches the switch 16 and closes it as the advance/retreat lever B moves.

A normally closed malfunction prevention reed switch So connected in series with the switches 5 and 16 is located outside the switches 5 and 16 in the switch housing A+.
(Magnetic sensing switch for preventing recreational activation) is provided. The reed switch So for preventing malfunction is the magnet 20+1.
It is installed in a position that is not affected by 5.

In the above configuration, when the cylinder lock is unlocked, the magnet 20 closes the unlock detection reed switch 5, which sends a signal to the controller and issues an alarm.
When the lock is broken and removed, the rotor removal detection reed switch 16 closes and issues an alarm.

Furthermore, the cylinder lock C is inserted into the cylinder lock C from the outside.
If the MO approaches, there is a risk that the switch 5 or 16 will malfunction;

Distance to Mlf j! Since o is smaller than the distance 111βl from the panel P to the reed switch 5 for detecting unlocking or the distance l1lIt12 from the panel P to the reed switch 5 for detecting rotor removal, the magnet Mo first closes the sealed switch S.
After O opens, the normally open switch 5 or 1G closes, and the magnetic force causes the detection reed switch 5, 1 to close.
Even if 6 malfunctions, the anti-theft device will not malfunction due to the malfunction prevention reed switch.

In the above embodiment, the removal of the rotor 2 of the cylinder lock C was detected, but it is also possible to detect the removal of the cylinder lock C itself, as in the conventional example. Further, in the above embodiment, a reed switch is used as the magnetic sensing switch, but a Hall element, a magnetic head, etc. may also be used.

Therefore, according to the present invention, it is possible to prevent malfunction of the anti-theft device for an automobile due to a strong magnet, and it is possible to prevent theft.

[Brief explanation of drawings]

FIG. 1 is a plan view showing a conventional anti-theft device for an automobile, FIG. 2 is a side view showing the anti-theft device for an automobile shown in FIG. 1 attached to a cylinder lock, and FIG. FIG. 4 is a side view showing the anti-theft device, FIG. 4 is a plan view of FIG. 3, and FIG. 5 is a circuit diagram showing the connection of the magnetic sensing switch in the present invention. C...Cylinder lock, 5...Reed switch for unlocking detection (magnetic sensing switch), 16...
・Reed switch (magnetic sensing switch) for detecting rotor removal, So......To prevent malfunction switch (magnetic sensing switch for preventing malfunction). In Figure 4

Claims (1)

[Claims] An anti-theft device mounted on a cylinder lock and having a magnetic sensing switch, characterized in that a magnetic sensing switch for preventing malfunction having a characteristic opposite to that of the magnetic sensing switch is connected in series to the magnetic sensing switch. anti-theft device.