JPS58120966A - Anti-theft apparatus for vehicle - 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 a vehicle anti-theft device.

2. Description of the Related Art Conventionally, there has been a wire lock type anti-theft device using a flexible strip, such as a wire, as an anti-theft device especially for motorcycles. This involves wrapping a lock wire around a strong structure such as a telephone pole and a vehicle, and locking the vehicle by fitting the locks attached to both ends of the lock wire to securely tie the vehicle to the structure. This is what I did.

However, in recent years, with the development of cutting tools such as wire cutters, wires can easily be cut, leading to frequent theft incidents. Anti-theft devices are used that activate the I-alarm alarm when the device detects the vehicle. It is possible to make it smaller.

The present invention has been made in view of the above-mentioned points, and detects the breakage of a flexible strip that connects a vehicle to a utility pole or the like or prevents a wheel from rotating. Sending a signal from a radio transmitter placed on the side of the vehicle, receiving the signal with a receiver carried by the driver and activating an alarm device; The present invention provides an anti-theft device for nine chapter vehicles that provides direct notification.

Hereinafter, one embodiment of the present invention will be illustrated in detail at a predetermined location of the motorcycle 1, for example, between the main frame 1m and the rear steering wheel 1b, and a generally triangular space above the IC (gusset) connecting these parts, based on the accompanying drawings. It is firmly tightened and fixed with bolts etc. so that it cannot be easily removed.

Connecting plugs 4 and 5 are fixed to both ends 3a and 3bK of the flexible strip 3 (Fig. 2), and each of these plugs 4
. , 5 to form a housing 21C) 2a, 2bK are connected and fixed.

As shown in FIG. 3, an optical fiber 6 is incorporated in the axial center position of the flexible strip 3, and the optical fiber 6 is coated with a synthetic resin material such as vinyl (not shown), and its outer pressure is A flexible member such as a plurality of wires (not shown)
are twisted, and one light-emitting element 7 is built into the vinyl plug 4 so that the light-emitting part faces the end 116m of the optical fiber 6.

A light-receiving element 8 is built into the plug 5 so that the light-receiving portion faces the end surface 6b of the optical fiber 6.

The connection terminals of these light-emitting elements 7 and light-receiving elements 8 are connected to connectors (not shown) fitted into plugs 4 and 5, respectively, and when these plugs 4 and 5 are connected to sockets 2g and 2b, these It is connected to connectors (not shown) arranged in sockets 2a and 2b of the housing, and connected to an electric circuit 10 housed within the two housings.

Electrical circuit 10 (Fig. 3) Fi transmitting circuit 11. Receiving circuit 1
2. The transmission circuit 10 is equipped with a disconnection detection circuit 13, and the transmission circuit 10 is, for example, a pulse oscillation circuit that outputs a pulse signal Pa of a predetermined period and applies it to the light emitting element 7.
The converter converts an electrical signal into a corresponding optical signal, operates in response to a pulse signal PaK, and emits an optical pulse signal Ph. This optical pulse signal Ph is transmitted into the optical fiber 6. The light receiving element 8d converts an optical signal into a corresponding electric signal, and outputs an electric pulse signal Pb corresponding to the optical pulse signal PhK input from the optical fiber 6. The receiving circuit 12 receives and detects the signal Pb from the light receiving element 8 and outputs the corresponding pulse signal Pc. The disconnection detection circuit 13 is connected to the transmission circuit 11. Pulse signal P output from the receiving circuit 12
It detects the disconnection of the optical fiber 6 by a and Pc,
For example, by taking an AND condition between signals Pa and Pc, if one condition is satisfied, it is determined to be normal, and if not, it is determined to be abnormal. ing. In addition, this disconnection detection circuit 13 determines the connection state between the plugs 4 and 5 and the connectors (not shown) of the sockets 2a and 2b of the two housings, and when they are connected, turns on the power source (not shown). K is configured to turn off the power when not connected.

The wireless transmitter 20 is housed in a two-person housing, and the oscillators 21 and 22 are activated when the signal Pd is input from the disconnection detection circuit 13, and the oscillator 21 outputs a high frequency signal with a carrier frequency fc. 22 outputs a low frequency signal with a variable wave frequency fs, which is sent via a variable capacitance diode (not shown) to the tuning circuit of the oscillator 21 and directly to the signal fc. R1
Multiply by 1I. The FM modulated wave signal fc outputted from the oscillator 21 is amplified by a buffer amplifier 23 and an output amplifier 24, and then sent out from an antenna 25. Hey, transmitter 2
It goes without saying that 0 may not be built into the two housings, but may be disposed at a predetermined location in a single unit.

The radio receiver 30 (Fig. 4) is carried by the driver when using the anti-theft device (when locked), and the frequency converter 32 receives the FM signal fc input from the antenna 31 and the local oscillator 33. A signal of frequency (fc-fe) is obtained by mixing the signal of frequency fe, and only the signal of frequency fc when the signal of predetermined intermediate frequency fi and the signal of (fc-fe) match is output. That is, the input signal fcJri is converted by the frequency converter 32 into a signal of frequency fi. This signal fi is amplified by an intermediate frequency amplifier 34. The FM detector (frequency discriminator) 35 detects the input signal fi and outputs a signal with a modulated wave frequency fs, which is applied to the tone squelch circuit 36.

The tone squelch circuit 36 closes the circuit and outputs an input signal fc when the input signal fs matches the signal of the natural frequency. That is, the tone squelch circuit 36 converts the intermediate frequency signal fi and the signal (
Even if a signal with a frequency fc that matches fc-fe) is output, the frequency f3 of the modulated wave signal is different from the tone squelch circuit 3.
If it does not match the natural frequency of No. 6, the modulated wave signal is not output. Therefore, unless the carrier frequency fc and the modulating wave frequency fs match, the circuits after the tone squelch circuit 36 will not operate, which allows for many combinations of both signals. The modulated wave signal that has passed through the tone squelch circuit 36 is amplified by a power amplifier 37 and then applied to an alarm, such as a buzzer 38. The buzzer 38 operates in response to this input signal and issues an alarm.

When using a vehicle anti-theft device having such a configuration, first, the KOJ flexible strip 3 is wrapped around a structure 40 such as a utility pole, as shown in FIG. 2 and FIG.
f: is fitted and connected into the sockets 2a and 2b of the two bodies.

Plugs 4 and 5 are socket 2a.

2b, locking pins (not shown) in the sockets 4, 5 are fitted into locking notches (not shown) in the plugs 4.5 by spring force, and these plugs 4, 5 are connected to the sockets 2a, 2b. That is, it is fixed to the wheel body 2A. In this way, the vehicle 1 is firmly connected to the utility pole 40 by the flexible member 3.

In the state where the plugs 4 and 5 are completely attached to the housing 2A, the electric circuit 10 is in operation and the optical fiber 6 is in operation.
A light pulse signal Ph is transmitted therein. In a state where the flexible strip 3 is not cut, the optical pulse signal p
h is transmitted to the light-receiving element 8, and from this light-receiving element 8 a signal p is transmitted.
b is output.

Therefore, the AND condition between the signals Pa and pb is satisfied, the disconnection detection circuit 13 outputs the signal Pd, and the first transmitter 20 does not operate. Therefore, the FM signal fc is not output, the receiver 30 is not activated, and the buzzer 38 is not activated.

However, when the flexible strip 3 is cut, the optical fiber 6
will also be severed. Then, the output signal pb of the light receiving element 8
becomes 0, the disconnection detection circuit 13 determines that there is an abnormality, and outputs the signal P.
Output d. The radio transmitter 20 is activated by this signal PdK, and the FM signal fc is transmitted from the antenna 25. When the radio receiver 30 carried by the driver receives and detects this FM signal fc, it is activated, and the buzzer 38 is activated to generate an alarm. Therefore, the driver can detect that the flexible strip 3 has been cut by this alarm sound, and can take appropriate measures against theft.

When the driver removes the flexible strip from the two housings,
Insert a key (not shown) into the hole of the two casings and release the locking relationship between the plugs 4 and 5 and the sockets) 2a and 2b.

Remove plug 4.5 from 2b. At this time, as described above, the power is turned off and the transmitter 20 does not operate, so that the reception ai! 30's buzzer 38 also does not operate.

1. In this embodiment, a case has been described in which a vehicle is tied to a structure such as a telephone pole using a flexible strip, but the invention is not limited to this. The flexible strip 3 may be passed between them.

As explained above, according to the present invention, when cutting a flexible strip, a wireless transmitter installed in the vehicle is activated, and an alarm built in a wireless receiver carried by the driver is activated. The cutting of the flexible strip can be easily detected even in a place far away from the vehicle and acoustically isolated from the vehicle, and has the excellent effect of extremely effectively preventing theft.

[Brief explanation of drawings]

Fig. 1 is an external view showing the vehicle anti-theft device according to the present invention installed on a motorcycle, Fig. 2 is an explanatory view of how the device of the present invention is used, and Fig. 3 is a vehicular anti-theft device according to the present invention. FIG. 4 is a circuit diagram showing an embodiment of the anti-theft device, and FIG. 4 is a circuit diagram showing an embodiment of the receiver of the device of the present invention. 1... Motorcycle, 2... Anti-theft device for vehicle, 2
Person... Housing, 3...-Flexible strip, 4, 5... Plug, 6... Optical fiber, 7... Light emitting element, 8...
Light receiving element, 10... Electric circuit, 20... Wireless transmitter, 30... Wireless receiver, 38... Alarm device, 40...
・Electric pole. Applicant Honda Motor Co., Ltd. Agent Patent Attorney Toshihiko Watanabe

Claims (1)

[Claims] 1. A housing fixed to the vehicle, and a flexible strip that is connected and fixed to the housing when locked and connects the vehicle to a structure such as a utility pole or locks the wheels so that they cannot rotate. In the vehicle anti-theft device, the anti-theft device for a vehicle is configured to electrically detect disconnection of the flexible strip by an electric circuit housed in the housing and issue an alarm; It is equipped with a wireless transmitter that activates and sends out a signal when the vehicle is disconnected, and a wireless receiver carried by the driver that receives the signal and activates a built-in alarm to issue an alarm. A vehicle anti-theft device, characterized in that the cutting of the flexible strip can be detected at a remote location.