Door unlocking device

Abstract: An object of this invention is to provide a door unlocking device adapted unlock a door by transmitting a signal in the air through a signal transmitter, which can unlock the door even when the power source of the signal transmitter, namely, the battery has consumed up. With a door unlocking device, upon insertion of an ignition key (6) into the rotor (13) of a key cylinder (11), a shutter (14) is opened to operate a shutter switch. Under this condition, the rotor (13) is turned in opposite directions from the neutral position according to a predetermined rotor turning pattern. The rotor turning pattern is discriminated by a rotor-turning-pattern discriminating circuit (10). Ensuring that the rotor turning pattern is the one predetermined for unlocking the door, the rotor-turning-pattern discriminating circuit (18) activates an electric operating mechanism to cause a lock mechanism to unlock the door.

Description: This invention relates to an unlocking device in accordance with the generic clause of claim 1 and more particularly to a door unlocking device having a door unlocking mechanism which automatically unlock a door in response to a signal which the user transmits through a signal transmitter or the like. Document DE-A-36 13560 describes an unlocking device wherein a first controller is carried by an operator and a second controller is located in a motor vehicle. The door of the vehicle is opened when the operator inputs a code signal that corresponds to a code signal stored in the second controller. Recently some motor vehicles have been equipped with a so-called wireless door lock device which is designed for instance as follows: An ignition key is provided with a signal transmitter. The transmitter is operated by the operator to transmit a radio wave signal (propagating in the air), which is detected by received signal discriminating means provided on the vehicle body. When it is determined that the radio wave signal is the one predetermined for the door of the motor vehicle, a electric actuator is operated to automatically lock or unlock the door. In general, the transmitter is operated on a battery. When, the transmitter being used for a long time, the power of the battery is consumed up, it becomes impossible to operate the transmitter to transmit the radio wave signal; that is, it becomes impossible to unlock the door. In another example of a known door unlocking device, an ignition key has a number of small holes, and a light emitting and receiving device is provided on the side of the key cylinder. When the ignition key is inserted into the key cylinder, light passed through the small holes of the ignition key is utilized to output a signal. When it is determined that the signal is the one predetermined for unlocking the door, the door lock is opened. However, the door unlocking device is still disadvantageous in that, when the device is used for a long time, the small holes of the ignition key may be deformed or collapsed, so that the predetermined signal cannot be provided; that is, the door cannot be unlocked. In view of the foregoing, an object of this invention is to provide a door unlocking device in which, even when it becomes impossible for the unlocking signal generating means to produce the output signal, the operation of the key cylinder causes the electric actuator in the electric operating mechanism to operate to unlock the door. The foregoing object of the invention has been achieved in accordance with the characterizing features of claim 1. In the case where the unlocking signal generating means produces no output signal for some reason, the rotor is turned in both directions with the key inserted into the key cylinder. When it is determined that the rotor turning pattern is the one predetermined for unlocking the door, the rotor-turning-pattern discriminating means causes the electric actuator of the electric operating mechanism to perform the unlocking operation, to unlock the door. FIG. 1 is an explanatory diagram, partly as a block diagram, showing the mechanical and electrical arrangement of a door unlocking device, which constitutes one embodiment of this invention; FIG. 2 (a) is a perspective view of essential components of the device of the present invention; FIG. 2 (b) is a schematic representation for an electric operating mechanism of the present invention; FIG. 3 is an enlarged perspective view for a description of the relation between a shutter provided for a rotor, and a switch provided inside the rotor; and FIG. 4 is a diagram showing a switching structure for detecting a direction of rotation of the rotor. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT One embodiment of this invention, which is applied to a motor vehicle, will be described with reference to the accompanying drawings. In FIG. 2 (b), reference numeral 1 designates a lock mechanism mounted on a door (not shown). When the lock mechanism 1 is given a locking displacement, it engages with a locking section on the side of the vehicle body, to lock the door; whereas when it is given a unlocking displacement, it unlocks the door. The lock mechanism is electrically operated. In order to operate the lock mechanism electrically, an electric operating mechanism 2 is provided as shown in Fig. 2 (b). The electric operating mechanism 2 has electric actuators, namely, a locking electromagnet 3 and an unlocking electromagnet 4. When the locking electromagnet 3 is energized through a door locking and unlocking switch 5 (FIG. 1) mounted on the door beside the driver's seat, a movable iron core (not shown) is displaced and is attracted by the locking magnet 3, so that the lock mechanism 1 is given the locking displacement, to lock the door. When the unlocking electromagnet 4 is energized through the door locking and unlocking switch 5, the movable iron core is moved in the opposite direction and is attracted by the unlocking electromagnet 4, so that the lock mechanism 2 is given the unlocking displacement, to unlock the door. On the other hand, the ignition key 6 of the motor vehicle has unlocking signal generating means, namely, a signal transmitter (not shown), and a locking operating button 7 and an unlocking operating button 8 which are used to operate the transmitter. A battery (not shown) is built in the ignition key 6, and it is used as a power source of the transmitter. Upon operation of the operating button 7 (or 8), the transmitter is activated, so that a locking instruction (or an unlocking instruction) is transmitted in the form of a signal propagating in the air, such as a radio wave signal, from the ignition key 6. The radio wave signal is received by an antenna 9 installed on the motor vehicle as shown in FIG. 1. The radio wave signal is a code signal of several tens of bits. The code for the locking instruction is different in content from the code for the unlocking instruction. As for the locking instruction and the unlocking instruction, the codes are determined separately according to motor vehicles; that is, different codes are provided for different motor vehicles. The radio wave signal received by the antenna is applied to received signal discriminating means, namely, a code discriminating circuit 10, where it is determined whether or not the code of the radio wave signal belongs to the motor vehicle, and it is also determined whether the code is of the locking instruction or whether it is of the unlocking instruction. When it is determined that the code belongs to the motor vehicle, and is of the locking instruction, the locking electromagnet 3 of the electric operating mechanism is energized to cause the lock mechanism 1 to operate to lock the door; whereas when it is determined that the code belongs to the motor vehicle, and is of the unlocking instruction, the unlocking electromagnet 4 is energized to cause the lock mechanism 1 to operate to unlock the door. On the other hand, a key cylinder 11 as shown in FIG. 2 (a) is built in the door (not shown). The key cylinder 11 has a rotor casing 12, in which a rotor 13 is rotatably fitted. The ignition key 6 can be inserted into the rotor 13 through a key inserting inlet 13a. In the electric operating mechanism 2, the unlocking electromagnet 4 is so designed that it is energized when the rotor 13 of the key cylinder is turned according a rotor turning pattern which is predetermined for the motor vehicle. As shown in FIG. 3, a shutter 14 is provided at the key inserting inlet 13a of the rotor 13, in such a manner that it is opened as the ignition key 6 is inserted into the key inserting inlet. In addition, a shutter switch 15 is provided which is operated in association of the opening of the shutter 14. That is, the shutter switch 15 is detecting means for detecting the insertion of the ignition key 6 into the rotor 13. As shown in FIG. 4, a protrusion 13b is extended from the rear end face of the rotor 13. The rotor casing 12 incorporates first signal generating means, namely, a forward rotation detecting switch 16 comprising a contactless switch for detecting the rotation of the rotor 13 in the forward direction of the arrow A from the neutral position, and second signal generating means, namely, a reverse rotation detecting switch 17 comprising a contactless switch for detecting the rotation of the rotor 13 in the reverse direction of the arrow B from the neutral position. The detection signal of the shutter switch 15, and the detection signals of the forward rotation detecting switch 16 and the reverse rotation detecting switch 17, are applied to a rotor-turning-pattern discriminating circuit 18. While the shutter switch 15 is outputting its detection signal; that is, during the period of time which elapses from the time instant that the ignition key 6 is inserted into the rotor 13 until it is removed, the rotor-turning-pattern discriminating circuit 18 detects the order in which the forward rotation detecting switch 16 and the reverse rotation detecting switch 17 are operated, thereby to detect the pattern in which the rotor 13 is turned. When it is determined that the rotor turning pattern thus detected coincides with the one predetermined for the motor vehicle, the rotor-turning-pattern discriminating circuit 18 energizes the unlocking electromagnet 4 of the electric operating mechanism 2 to cause the lock mechanism 1 to operate to unlock the door. The operation of the door unlocking device thus organized will be described. When the operator, leaving his motor vehicle, has operated the locking operating button 7 of the ignition key 6 to lock the door, a locking instruction is transmitted, as a radio wave signal, from the ignition key 6. The radio wave signal is received by the antenna 9, and then applied to the code discriminating circuit 10. The code discriminating circuit 10 discriminates the radio wave signal. Ensuring that the radio wave signal is of the code predetermined for locking the door, the code discriminating circuit 10 operates to energize the locking electromagnet 3 of the electric operating mechanism 2, so that the lock mechanism 1 is given the locking displacement, thus locking the door. In order to unlock the door to drive the motor vehicle, the unlocking operating button 8 on the ignition key 6 is operated. As a result, an unlocking instruction is issued, in the form of a radio wave signal, from the ignition key 6. Similarly as in the above-described case, the radio wave signal is applied through the antenna to the code discriminating circuit, where it is discriminated. Ensuring that the radio wave signal is of the code predetermined for unlocking the door, the code discriminating circuit 10 operates to energize the unlocking electromagnet 4 of the electric operating mechanism 2, so that the lock mechanism 1 is given the unlocking displacement, to unlock the door. When the radio wave signal is not of the predetermined code, the code discriminating circuit 10 does not operate to energize the unlocking electromagnet 4. Hence, the lock mechanism 1 is not operated; that is, the door is held locked. In the case where the transmitter on the ignition key 6 is used for a long period, its power source, namely, the battery may be consumed up. In this case, no radio wave signal can be transmitted from the ignition key, i.e., from the transmitter; that is, it is impossible to unlock the door with the radio wave signal. In this case, the device is operated as follows: The ignition key 6 is inserted into the rotor 13 of the key cylinder, and is then turned in the forward direction and in the reverse direction according to a predetermined rotor turning pattern, so that the forward rotation detecting switch 16 and the reverse rotation detecting switch 17 output the detection signals, which are applied to the rotor-turning-pattern discriminating circuit 18 to allow the latter 18 to decide a rotor turning pattern therefrom. Ensuring that the rotor turning pattern is the one predetermined for unlocking the door, the rotor-turning-pattern discriminating circuit 18 operates to energize the unlocking electromagnet 4 of the electric operating mechanism 2 thereby to cause the lock mechanism 1 to unlock the door. Hence, even when the battery is consumed up; that is, even when no electric power is provided for the transmitter on the ignition key, the door can be unlocked by turning the rotor 13 according to the predetermined rotor turning pattern. In the above-described embodiment, the signal propagating in the air is the radio wave signal; however, the invention is not limited thereto or thereby. That is, it may be an ultrasonic signal or an infrared signal. Furthermore, in the above-described embodiment, the unlocking signal generating means is the transmitter; however, it may be replaced by the following means: A number of small holes are formed in the ignition key, and a light emitting and receiving device is provided for the key cylinder, so that, when the ignition key is inserted into the key cylinder, a signal is produced in response to light passed through the small holes. In addition, the functions of the code discriminating circuit 10 and the rotor-turning-pattern discriminating circuit 18 may be replaced by program control of a microcomputer. While the invention has been described with reference to the embodiment shown in the accompanying drawings, it should be noted that the invention is not limited thereto or thereby, and it is obvious to those skilled in the art that various changes and modifications may be made therein without departing from the invention as defined by the accompanying claims. For instance, the technical concept of the invention may be widely applied to devices for unlocking doors in general as well as the above-described motor vehicle door unlocking device. As was described above, in the invention, it is detected in what pattern the rotor has been turned in the opposite directions during the period of time which elapses from the time instant that the ignition key is inserted into the rotor until it is removed therefrom, and when the rotor turning pattern thus detected is the one predetermined for unlocking the door, the electric actuator of the electric operating mechanism is operated to unlock the door. Hence, even when the unlocking signal generating means produces no unlocking signal, the door can be unlocked by turning the rotor with the ignition key in both directions according to the predetermined rotor turning pattern. This effect should be highly appreciated.

Claims: A door unlocking device comprising: an electric operating mechanism (2) including an electric actuator (3,4) for performing an unlocking operation to cause a lock mechanism to operate to unlock a door; received signal discriminating means (10) for causing said electric actuator (3,4) of said electric operating mechanism (2) to perform said unlocking operation when a signal received by said received signal discriminating means (10) is a predetermined signal for unlocking said door; characterized by detecting means (15) for detecting an insertion of key (6) into a rotor (13); signal generating means (16,17) generating a signal in accordance with rotation of said rotor (13); and rotor-turning-pattern discriminating means (18) for causing said electric actuator (3,4) of said electric mechanism (2) to perform said unlocking operation when a rotor (13) turning pattern predetermined for unlocking said door is produced by said signal generating means (16,17) while said insertion of said key is detected by said detecting means (15); and wherein said signal generating means (16,17) generates a first signal when said rotor (13) is turned in one direction from a neutral position, and generates a second signal when said rotor (13) is turned in the other direction opposite to said one direction from a neutral position. A door unlocking device as claimed in claim 1, wherein said signal generating means (16,17) includes a forward rotation detecting switch (16) and a reverse rotation detecting switch (17). A door unlocking device as claimed in claim 1, wherein said detecting means (15) includes a shutter provided at a key inserting inlet of said rotor (13) and a shutter switch operated in association with an opening of said shutter.

Inventors: AOKI HISASHI C O KABUSHIKI KAI, KOKUBU SADAO C O KABUSHIKI KAI, MIZUNO YOSHIYUKI C O KABUSHIKI, AOKI, HISASHI, C/O KABUSHIKI KAISHA TOKAI RIKA, KOKUBU, SADAO, C/O KABUSHIKI KAISHA TOKAI RIKA, MIZUNO, YOSHIYUKI, C/O KABUSHIKI KAISHA TOKAI RIKA
Applicants: TOKAI RIKA CO LTD, KABUSHIKI KAISHA TOKAI RIKA DENKI SEISAKUSHO
Application year: 1992
Main classification: E05B65
IPC codes: E05B65, B60J5, G07C9, E05B49