JP3127171B2 - Key cylinder device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is configured such that the entrance is separated from the back when a non-authorized key is inserted into the key insertion slot and is forced to rotate. The present invention relates to a key cylinder device provided with a rotor.

[0002]

2. Description of the Related Art For example, in a key cylinder device for a door in an automobile, the rotation of the rotor is permitted when a proper key is inserted into a key insertion opening of the rotor for the purpose of preventing theft. When something other than a key (such as a screwdriver) is inserted, the rotation of the rotor is disabled by the action of the tumbler, and the door cannot be unlocked.

Further, as a rotor used in this type of key cylinder device, there is a rotor having a configuration in which a plurality of slits are formed on an outer peripheral surface on an inlet side of the rotor. The one using such a rotor is called, for example, a fuse key,
When trying to forcibly rotate the rotor by inserting something other than a regular key into the key insertion slot, since the rotor is broken at the slit and the entrance is separated from the back, The entire rotor cannot be rotated, and thus cannot be unlocked.

[0004]

The conventional structure described above is effective in preventing theft due to the rotor being destroyed. However, conventionally, there is no means for detecting that the rotor has been destroyed, and no further measures can be taken.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a key cylinder device capable of detecting whether a key is inserted into or removed from a key insertion slot, that is, the presence / absence of a key, and detecting when the rotor is broken. is there.

[0006]

A key cylinder device according to the present invention is rotatably provided on a key cylinder body, and cannot rotate except when a proper key is inserted into a key insertion slot. A rotor configured such that an inlet portion is separated from a back portion when a rotation force exceeding a certain value is received in a non-rotatable state, a permanent magnet provided at an inlet portion of the rotor, and the key cylinder. A magnetic detecting element provided on the main body so as to receive the magnetic force of the permanent magnet; and a rotor provided to urge the rotor in a direction to close the key insertion opening and pressed by a key inserted into the key insertion opening. And a shutter made of a magnetic material that changes the magnetic force of the permanent magnet with respect to the magnetic detection element in the open position, and is provided near the magnetic detection element. Magnetic A coil configured to selectively apply a force, and a control unit configured to control power cut-off of the coil to detect a detection state of the magnetic detection element when the detection state of the magnetic detection element changes. It is characterized by

[0007]

When the key is inserted into the key insertion slot, the shutter in the closed state is pressed by the key and displaced in the opening direction.
With the displacement, the magnetic force of the permanent magnet on the magnetic detection element changes, and the magnetic detection element detects the change in the magnetic force. The presence or absence of the key can be detected by the control means detecting the detection state of the magnetic detection element.

On the other hand, when a rotor other than a regular key is inserted into the key insertion slot and the rotor is forcibly rotated, and the rotor is broken, the permanent magnet also rotates together with the entrance of the rotor. For this reason, the magnetic force of the permanent magnet with respect to the magnetic detection element changes in the case where a regular key or something other than the regular key is simply inserted into the key insertion slot.

[0009] Therefore, when the control means controls the cut-off of the coil, the magnetic force of the coil acts on the magnetic detecting element in addition to the magnetic force of the permanent magnet. By detecting the detection state of the magnetic detection element at this time, it is possible to detect whether or not the rotor has been broken.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is applied to a key cylinder device for an automobile door will be described below with reference to the drawings. First, in FIG. 2 to FIG. 4, a key cylinder main body 1 attached to a door of an automobile includes a rotor case 2, a case cover 3, and the like. In the rotor case 2, a rotor 5 having a key insertion port 4 is rotatably provided.

As shown in FIG. 5, a plurality of slits 6 are formed on the outer peripheral surface of the rotor 5 on the inlet 5a side, and a plurality of tumbler grooves 7 are formed on the inner side 5b. Have been. A rotor cover 8 having a key insertion hole 8a corresponding to the key insertion port 4 is provided on the front side of the rotor 5.

Thus, as is well known, the rotor 5
Although not shown, a plurality of tumblers are provided, and when a regular key 9 is inserted into the key insertion slot 4, each tumbler is housed in the rotor 5 and rotated. However, when a key other than the regular key 9 is inserted, the tumbler protrudes outward from the tumbler groove 7 and cannot rotate.
When a rotation force exceeding a certain level is received in a state in which rotation is impossible, the slit 6 is broken to separate the inlet portion 5a and the inner portion 5b.

A shutter 10 made of a magnetic material for opening and closing the key insertion opening 4 is provided inside the rotor 5. The shutter 10 has side plates 11 on both sides and is rotatably mounted by shafts 12 at both ends, and is urged by a torsion coil spring 13 in a direction to close the key insertion opening 4.

A permanent magnet 14 is fixedly provided inside the rotor 5 near the torsion coil spring 13. When the shutter 10 is rotated in the opening direction, the permanent magnet 14 is covered by the shutter 10 as shown by a two-dot chain line in FIG.

A rotor rotation detection switch 15 is provided at the tip of the rotor 5. The rotor rotation detection switch 15 detects the neutral, locked, and unlocked positions of the rotor 5.

On the other hand, a circuit board 16 is provided at a predetermined portion of the rotor case 2, and a reed switch 17 as a magnetic detecting element is provided on the circuit board 16.
A coil 18 is provided so as to surround the reed switch 17. In this case, when the shutter 10 is in the closed state and the coil 18 is turned off, the reed switch 17 receives the magnetic force of only the permanent magnet 14 and is held in the off state. I have.

The reed switch 17 and the coil 1
8 is a control circuit 19 as a control means as shown in FIG.
It is connected to the. The control circuit 19 includes a microcomputer, and includes a battery 20 of an automobile.
Is used as a power source, and based on input of signals from the reed switch 17 and the rotor rotation detection switch 15, the coil 18 is controlled to be turned on and off as described later.

Next, the operation of the above configuration will be described with reference to FIGS. FIG. 6 shows the magnetic flux density of the reed switch 17 in each state.
Indicates the state of each item.

However, in FIG. 6, B1: the magnetic flux density of the reed switch 17 only by the permanent magnet 14 when the rotor 5 is at the neutral position B2: When the rotor 5 is at the neutral position
Magnetic flux density of the reed switch 17 by the permanent magnet 14 when the shutter 10 is opened. B3: Reed switch 17 by the permanent magnet 14 when the shutter 10 is opened and the rotor 5 is rotated to the unlock position. B4: The magnetic flux density of the reed switch 17 due to the energization of the coil 18 B5: The magnetic flux density of the reed switch 17 due to a strong magnetic field applied from the outside Bth: The threshold for turning on / off the reed switch 17 Show.

Each value satisfies the following relationship.

B5>B1>B2> B3, Bth is B1 and B
Bth <B5-B4, Bth> B1-B4, Bth
<B2 + B4, Bth> B3 + B4 At this time, the direction of the magnetic field is positive in the direction of arrow A in FIG.

(1) First, when the rotor 5 is in the neutral position and nothing is inserted in the key insertion slot 4 (see (1) in FIG. 7). In this state, the rotor rotation detection switch 15 is set to the neutral position. Detection, and since the shutter 10 is in the closed state,
The reed switch 17 is turned off by receiving a magnetic force (magnetic flux density B1) only by the permanent magnet 14.

At this time, the control circuit 19 determines that ΔT
During T, the coil 18 is turned off and on so that the magnetic flux density of -B4 acts on the reed switch 17 portion. Then, from the relationship of Bth> B1-B4, the reed switch 17
Is turned on while the coil 18 is energized, and turned off otherwise. The control circuit 19 can detect that the reed switch 17 changes in this way based on the power cutoff control of the coil 18, thereby detecting that the reed switch 17 is in a normal state.

(2) When the key 9 is inserted into the key insertion slot 4 with the rotor 5 in the neutral position (see the state (2) in FIG. 7). In this state, the shutter 10 is pressed by the key 9 and opened. since it is pivoted to a position (see two-dot chain line in FIG. 1 and Figure 2), (is not covered completely) to become as covered by the permanent magnet 14 is the shutter 10. Then, the lines of magnetic force of the permanent magnet 14 almost pass through the shutter 10, and the magnetic flux density of the reed switch 17 becomes lower than the threshold value B.
Since B2 is smaller than th, the reed switch 17 is turned on.

At this time, when the control circuit 19 detects that the state of the reed switch 17 has changed to the ON state,
At period T, + B4 is applied to reed switch 17 for ΔT.
So that the coil 18 is turned on and off so that the magnetic flux density acts. Then, from the relationship of Bth <B2 + B4, the reed switch 17 is turned off while the coil 18 is energized, and turned on otherwise. Control circuit 19
By detecting that the reed switch 17 changes in such a manner based on the power cutoff control of the coil 18,
It detects that the key 9 has been inserted into the key insertion slot 4.

(3) When a foreign object such as a driver is inserted into the key insertion slot 4 and the rotor 5 is broken (see the state (3) in FIG. 7). The shutter 5 (including the shutter 10 and the permanent magnet 14) is rotated to the unlock position, and the back portion 5b remains at the neutral position. Therefore, in this case, the rotor rotation detection switch 15 still detects the neutral position.

At this time, as shown by the broken line in FIG. 1, the permanent magnet 14 is rotated together with the shutter 10 to the unlock position while being covered by the shutter 10, so that the magnetic flux density of the reed switch 17 is reduced. , B2 in the above case (2)
B3 is smaller than B3. Since B3 is smaller than the threshold value Bth, the reed switch 17 is also turned on in this case.

At this time, similarly to the case of (2), the control circuit 19 controls the power cutoff of the coil 18 so that the magnetic flux density of + B4 acts on the reed switch 17 for the period T for ΔT. I will be. Then, in this case, since the reed switch 17 has a relation of Bth> B3 + B4, even if the coil 18 is energized and the magnetic flux density of + B4 increases, the magnetic flux density acting on the reed switch 17 does not reach the threshold value Bth. , And remains unchanged.

The control circuit 19 detects that the reed switch 17 remains on even when the power supply to the coil 18 is controlled in this manner, so that the rotor 5 is distinguished from the case (2). Detect that it has been destroyed.

(4) When the rotor 5 is normally rotated to the unlock position by the key 9 (see (4) in FIG. 7). In this state, the permanent magnet 14 Since the shutter 10 is rotated to the unlock position together with the shutter 10 while being covered by the shutter 10, the reed switch 1
The magnetic flux density of the portion 7 becomes B3, and also in this case, the reed switch 17 is turned on.

However, in this case, the entire rotor 5 is rotated to the unlock position, and the rotor rotation detection switch 15 detects the unlock position.
9 can detect that the rotor 5 has been normally rotated to the unlock position, as distinguished from the case of (3) above.

(5) On the other hand, if the state of the above (1) is normal, the state of the reed switch 17 changes based on the power cutoff of the coil 18 as described above.
If the state of the reed switch 17 does not change even after the power cutoff control, some abnormality (for example, the reed switch 1
7 or a disconnection), and the control circuit 19 can detect an abnormality based on this.

(6) As shown in FIG. 6, in the state of (1), a strong magnetic field is applied to the reed switch 17 by mischief or the like, and the magnetic flux density of the reed switch 17 becomes B5. In this case, due to the relationship of Bth <B5−B4, the reed switch 1 is not controlled even if the coil 18 is turned off.
7 remains off and does not change, so that the control circuit 19 can detect an abnormality.

According to this embodiment, the control circuit 1
By detecting the state of the reed switch 17 at 9, it is possible to detect the insertion / removal of the key 9 from the key insertion slot 4, that is, the presence or absence of the key 9.

In the state where the shutter 10 is opened,
By controlling the cutoff of the coil 18 and detecting the state of the reed switch 17 based on the control, it is possible to detect whether or not the rotor 5 is broken. Therefore, conventionally, even if the rotor 5 is destroyed, there is no means for detecting it, and no further measures can be taken. However, according to the present embodiment, when the rotor 5 is destroyed, Can be detected, for example, the starter of the engine can be cut off at the time of detection, or a horn or a headlight can be driven to issue an alarm.

Further, in the normal state in which the shutter 10 is closed, the coil 18 is controlled to be turned off, and the state of the reed switch 17 based on the control is detected. be able to.

In the above-described embodiment, the coil 18 is provided so as to surround the reed switch 17, but the coil 18 may be arranged near the reed switch 17 so as to be in parallel with the reed switch 17. The present invention can be appropriately modified and implemented without departing from the scope of the invention.

[0038]

As is apparent from the above description, according to the present invention, the state of the magnetic detecting element is detected by the control means , whereby the key is removed from the key insertion slot, that is, the presence or absence of the key is detected. can do. Further, by controlling the cut-off of the coil with the shutter opened and detecting the state of the magnetic detection element based on the control, it is possible to detect whether or not the rotor has been destroyed. It is possible to issue an alarm upon detection.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram showing one embodiment of the present invention.

FIG. 2 is an enlarged fragmentary side view of a main part.

FIG. 3 is a front view

FIG. 4 is a side view

FIG. 5 is a perspective view of a rotor.

FIG. 6 is a diagram showing a change in magnetic flux density acting on a reed switch portion.

FIG. 7 is a diagram showing a change in the state of each item for explaining the operation;

[Explanation of symbols]

1 is a key cylinder body, 4 is a key insertion slot, 5 is a rotor,
5a is the entrance, 5b is the back, 6 is the slit, 9 is the key,
10 is a shutter, 13 is a torsion coil spring (biasing means), 14 is a permanent magnet, 15 is a rotor rotation detection switch, 17 is a reed switch (magnetic detection element), 18 is a coil, and 19 is a control circuit (control means). Is shown.

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-61-68983 (JP, A) JP-A-4-106280 (JP, A) JP-A-5-39682 (JP, A) 144187 (JP, U) Actual opening 62-32162 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) E05B 17/20 E05B 15/00 E05B 17/22 E05B 65/20

Claims (1)

(57) [Claims] A key cylinder body is provided rotatably, and cannot be rotated except when a regular key is inserted into a key insertion slot. And a permanent magnet provided at the inlet of the rotor, and the key cylinder body receives the magnetic force of the permanent magnet when the rotor is configured. A magnetic detection element provided, provided on the rotor in such a manner as to urge the rotor in a direction to close the key insertion opening, and is displaced in an opening direction by being pressed by a key inserted into the key insertion opening; A magnetic shutter that changes the magnetic force of the permanent magnet with respect to the magnetic detection element; and a coil that is provided near the magnetic detection element and selectively applies a magnetic force to the magnetic detection element; The magnetic Key cylinder device formed by a control means for detecting a detection state Tsudan electrostatic controlling the magnetic detection elements the coil when the detected state has changed in the detection element.