Abstract:
A device is designed to prevent a car theft and is provided with a remote controller for activating or deactivating the device. The device comprises a control unit, one or more oil pressure jacks, one or more oil pressure driving apparatus, and a plurality of sensors capable of transmitting a triggering signal to the control unit at such time when the car body is exerted on by external forces. As the control unit is triggered, the oil pressure driving apparatus are actuated to drive the oil pressure jacks to hoist the car body, thereby preventing the car from being driven away by an unauthorized person.

Description:
FIELD OF THE INVENTION 
     The present invention relates generally to a device for preventing a car from being stolen, and more particularly to a device for preventing the theft of a car by jacking up the car at the time when the theft is under way. 
     BACKGROUND OF THE INVENTION 
     The conventional car burglary preventing device comprises a control unit, a loud speaker, a plurality of sensors, and a remote controller. The control unit and the loud speaker are installed in the inside of the car. The user of the device uses the remote controller to transmit a control signal to turn on or off the control unit. As the control unit is turned on, it is capable of triggering the loud speaker to give off the alarm to frighten the burglar. 
     Such a conventional device as described above is in fact ineffective in preventing the theft of the car. A remedial measure is added such that the power source of the starter is simultaneously shut off at the time when the alarm is given off. However, the remedial measure often fails to prevent the car from being stolen by a skillful thief who is capable of reconnecting the power source. 
     Nowadays the car thieves are so arrogantly aggressive that they just simply tow away a car which they intend to steal. Under such a circumstance, all conventional devices in existence have become obsolete. 
     SUMMARY OF THE INVENTION 
     It is therefore the primary objective of the present invention to provide a device which is more effective than the conventional devices in preventing the car burglary. 
     It is another objective of the present invention to provide an effective device to prevent the car theft. 
     It is still another objective of the present invention to provide a device capable of jacking up a car at the time when the car is being tampered with by an unauthorized person. 
     In keeping with the principle of the present invention, the foregoing objectives of the present invention are attained by a device comprising at least one oil pressure jack, at least one oil pressure driving device, a remote controller, a receiver, a control unit, and a plurality of sensors. The oil pressure jack is mounted in the bottom of a car frame and is driven by the oil pressure driving device to extract or retract. The remote controller is used by its user to transmit two different kinds of signals to activate or deactivate the car theft preventing device of the present invention. The signals transmitted by the remote controller are received by the receiver which is disposed in a predetermined position of the car body. The control unit is disposed in a predetermined position of the car body and is provided with an output end which is connected with the oil pressure driving device. The control unit is also connected with the receiver via which the control unit receives the signal transmitted by the remote controller so as to control the action of the oil pressure driving device. The sensors are disposed in the predetermined positions of the car body and are connected with the control unit. As any one of the sensors detects any vibration of the car body, the sensors transmit an electronic signal to the control unit which in turn activates the oil pressure driving device to drive the oil pressure jack to hoist the car body. 
     The foregoing objectives, features and advantages of the present invention will be more readily understood upon a thoughtful deliberation of the following detailed description of a preferred embodiment of the present invention with reference to the accompanying drawings. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     FIG. 1 shows a schematic view of the layout of the preferred embodiment of the present invention. 
     FIG. 2 is a schematic view showing that the oil pressure jack of the present invention is mounted in the underside of a car body frame. 
     FIG. 3 is a schematic view of the oil pressure jacks of the present invention in the standby state. 
     FIG. 4 shows a schematic view of the oil pressure jacks of the present invention at work. 
     FIG. 5 shows a schematic view of another oil pressure jacks of the present invention in the standby state. 
     FIG. 6 shows a schematic view of the action of the oil pressure jacks as shown in FIG.  5 . 
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
     As shown in FIGS. 1 and 2, a car theft preventing device  10  embodied in the present invention comprises four oil pressure jacks  11 , four oil pressure driving apparatus  21 , one remote controller  31 , one signal receiver  43 , and one control unit  41 . 
     The four oil pressure jacks  11  are mounted in the front and the rear sections of the.,underside of a car body frame and are provided with an extractable and retractable support rod  13 . 
     The four oil pressure driving apparatus  21  are respectively, connected with the four oil pressure jacks  11  for driving the support rod  13  of each jack  11  to extract or retract. 
     The remote controller  31  is used to transmit an operation signal. 
     The control unit  41  of the preferred embodiment of the present invention is a single chip controller in which a predetermined control program is recorded for specifying the operations to be performed. The control unit  41  is connected with the signal receiver  43  and provided with four output ends  45 , with each being connected with one oil pressure driving apparatus  21  via a relay  47 . The remote controller  31  emits an operation signal, which is then transmitted to the control unit  41  via the signal receiver  43  such that the control unit  41  gives off a control signal on the basis of the operation signal. The control signal serves to control via the output end  45  the operation of the oil pressure driving apparatus  21  which in turn controls the operation of the oil pressure jack  11 . 
     The preferred embodiment of the present invention further comprises an independent storage battery  51 , a loudspeaker  53 , a plurality of sensors  55 , a plurality of height sensors  56 , a car roof sensor  57 , four level sensors  59 , and a chip locking set  61 . 
     The storage battery  51  is disposed in a predetermined position of a motor vehicle and is connected with the oil pressure driving apparatus  21 . The storage battery  51  is in a parallel connection with the alternator of the motor vehicle and is capable of providing independently the oil pressure driving apparatus  21  with the power. In the meantime, the storage battery  51  is capable of storing an electrical charge generated by the alternator. The storage battery  51  is thus independent of the electrical system of the motor vehicle. 
     The loudspeaker  53  is connected with and controlled by the control unit  41 . 
     The sensors  55  are mounted respectively on various parts of the body of the motor vehicle, such as doors, hood, trunk lid, etc. The sensors  55  are connected with the control unit  41  and are intended to detect the opening of the doors, hood, trunk lid of the motor vehicle by the unauthorized person. 
     The height sensors  56  are mounted respectively on the shock absorbers of the motor vehicle such that the height sensors  56  are connected with the control unit  41 . The height sensors  56  are intended to detect any change in height of the motor vehicle. 
     The roof sensor  57  is mounted in the roof of the motor vehicle and is connected with the control unit  41 . The roof sensor  57  is intended to detect an obstacle over top of the roof or the distance between the roof of the motor vehicle and the roof of a garage. 
     The level sensors  59  are fastened with the body of the motor vehicle and are connected with the control unit  41 . The level sensors  59  are used to detect a change in the longitudinal or horizontal level of the body of the motor vehicle. 
     The chip locking set  61  has a chip lock  63  and a chip key  65 . The chip locking set  61  is connected with the control unit  41 . The chip lock  63  is capable of transmitting an “OFF” signal to the control unit  41  only after the chip key  65  is properly inserted into the chip lock  63 . 
     As illustrated in FIG. 3, the device  10  of the present invention is activated as soon as the “ON” key of the remote controller  31  is pressed. The control unit  41  receives the activation signal via the signal receiver  43 . As a result, The device is ready to operate. When the motor vehicle is tampered with such that the door, the hood, or the trunk lid is opened or damaged, and that the height of the body of the motor vehicle is changed up to 3 centimeters, and further that the height sensors  56  have been triggered up to 3 seconds, as shown in FIG. 4, the control signals are transmitted via the four output ends  45  of the control unit  41  to activate the oil pressure driving apparatus  21 , thereby resulting in the extraction of the support rod  13  of each jack  11 . The motor vehicle is thus raised. In the meantime, The alarm is sounded by the loudspeaker  53  to frighten the thief. The power that is used to operate the oil pressure driving apparatus  21  is furnished by the storage battery  51 , without making use of the power of the storage battery of the motor vehicle. As the body of the motor vehicle is hoisted by the support rods  13  of the jacks  11 , the level state of the body of the motor vehicle is detected by the level sensors  59  so as to enable the control unit  41  to control the adjustment of the support rods  13  to keep the body of the motor vehicle in the well-balanced state even on the slope on which the motor vehicle is parked. The hoisting of the motor vehicle by the jacks  11  is coordinated with the roof sensor  57  so as to avert the damage of the roof of the motor vehicle by the obstacle located over the roof the of motor vehicle. 
     The activated device  10  of the present invention is deactivated by pressing the “OFF” key of the remote controller  31 . In the event that the operation of the device  10  is in progress, the device  10  can be deactivated by pressing the “OFF” key of the remote controller  31 . Upon having received the instruction, the control unit  41  stops the buzzing of the loudspeaker  53 . In the meantime, the user of the device  10  inserts the chip key  65  into the chip lock  63 . As a result, the oil pressure driving apparatus  21  are controlled by the control unit  41  to retract the jacks  11 , so as to lower the body of the motor vehicle to its original position, as shown in FIG.  3 . 
     As shown in FIGS. 5 and 6, the device of the present invention may comprise a plurality of oil pressure jacks  11 ′, with each having a support rod and a swiveling apparatus (not shown in the drawings) to enable the body frame of the motor vehicle to swivel horizontally or vertically. 
     It is therefore readily apparent that the device  10  of the present invention overcomes the deficiencies of the conventional devices for preventing car burglary or theft. The remote controller  31  of the present invention may be optionally provided with keys, such as “up” key, “STOP” key, “DOWN” key, etc. for the control of the elevation of the oil pressure jacks by the control unit, so as to facilitate the replacing of a flat tire or the changing of the engine oil of the motor vehicle. The loudspeaker  53  is an optional equipment.