JPH0737751B2 - Magnetic card lock device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic card lock device which is unlocked by inserting and pushing a magnetic card key.

[0002]

2. Description of the Related Art Conventionally, as this type of magnetic card lock device, for example, those shown in FIGS. 6 and 7 have been known.

As shown in FIG. 6, this magnetic card lock device has a magnetic shield plate 51 and a non-magnetic cover plate which are arranged in a housing 50 constituting a door knob so as to face each other with respect to the housing 50. 52 and a plurality of lock holes 54a with which a plurality of lock magnets 53 attracted to the shield plate 51 are engaged, and are fixed to the housing 50 and arranged adjacent to the cover plate 52. It has a magnetic lock plate 54 and a plurality of recesses 55 for receiving a part of the lock magnet 53, that is, only a part of the lock magnet 53 at the time of locking and receiving the whole of the lock magnet 53 at the time of unlocking. And a slide member 56 that slides along the lock plate 54. 6, reference numeral 57 is a leaf spring that biases the shield plate 51 toward the cover plate 52, and reference numeral 58 is a coil spring that biases the slide member 56 upward in FIG.

At the time of locking, as shown in FIG. 6, a plurality of lock magnets 53 attracted to the shield plate 51 engage with the lock holes 54a of the lock plate 54 and contact the cover plate 52, Further, a part of the lock magnet 53 is caught in the recess 55, and the slide member 56 is restrained at the locking position.

Further, as shown in FIG. 7, a magnetic card A
Is inserted between the shield plate 51 and the cover plate 52 from the magnetic card insertion opening 50a (see FIG. 6) of the housing 50. At the time of unlocking, as shown in FIG. Due to the magnetic repulsive force acting between the magnetic spot a (see FIG. 7; magnetized to the same pole as the end face of the lock magnet 53 on the magnetic card A side) and the plurality of lock magnets 53, all the lock magnets 53 are moved. The slide member 56 is freed from the cover plate 52 and falls into the recess 55. Then, when the magnetic card A is further pushed, the slide member 56 slides by the dimension L from the locked position (FIG. 6) to the unlocked position (FIG. 7) by the magnetic card A against the elastic force of the coil spring 58. .

[0006]

However, in the magnetic card lock device, as shown in FIG. 8, a fake card, for example, a fake card B made of plastic and having the same shape and size as the regular magnetic card A is inserted. When pushed in, the slide member 56 moves slightly by the dimension M, and the lock magnet 53 is fixed by being sandwiched between the lower inner peripheral surface of the lock hole 54a and the upper inner peripheral surface of the recess 55 in the drawing. Therefore, in this state, when vibration is applied from the outside of the housing 50, the vibration is transmitted to the lock magnet 53, and the lock magnet 53 gradually moves to the concave portion 55 side and falls into the concave portion 55. There was a possibility that it would occur. In reality, when a plurality of lock magnets 53 are provided, there is almost no possibility that all the lock magnets 53 will fall into the recess 55 at the same time, so there is no possibility of causing the above inconvenience, but the lock magnets If there is only one 53, the above inconvenience may occur.

Therefore, an object of the present invention is to prevent the lock magnet from moving and falling into the recess even if an attempt is made to move the lock magnet by vibrating the housing from the outside with the fake card inserted. To provide a device.

[0008]

To achieve the above object, the present invention provides a magnetic shield plate disposed in a housing in which a magnetic card is inserted, and the shield plate disposed along the shield plate. A non-magnetic lock plate fixed to the housing, which has a plurality of lock holes with which a plurality of lock magnets attracted to each other are locked, and a part of the lock magnet is caught during locking, and the lock is locked during unlocking. A magnetic card lock device, comprising: a slide member having a plurality of recesses for receiving a magnet and sliding along the lock plate when unlocked, at least one lock of the plurality of lock magnets The magnet is divided into two magnet pieces, and is formed at the opening end of the concave portion, and the magnet piece is positioned on the shield plate side. There is provided a magnetic card lock device characterized by that one of the magnet pieces to form a step portion engageable.

[0009]

According to the present invention, even if a false card is inserted along the shield plate and vibration is applied from the outside of the housing, the magnet piece on the shield plate side of the lock magnet has the opening end of the recess of the slide member. Since the lock magnet is engaged with the stepped portion at the position to prevent the lock magnet from further moving, vibrations prevent the lock magnet from falling into the recess.

[0010]

EXAMPLE An example of the present invention will be described below.

1 to 5 show an embodiment of a magnetic card lock device according to the present invention. FIG. 1 is an enlarged sectional view when locking, FIG. 2 is an enlarged sectional view when inserting a magnetic card, 3 is an enlarged cross-sectional view when a fake card is inserted, FIG. 4A is a cross-sectional view of a recess, FIG. 4B is a plan view of the recess, and FIG. 5 is a side view of a door knob equipped with the magnetic card lock device of this embodiment. is there.

The magnetic card lock device of this embodiment is shown in FIG.
As shown in FIG. 5, a magnetic shield plate 11 and a non-magnetic cover plate 12 fixed to the housing 10 and facing each other are provided in the housing 10 of the door knob.
A non-magnetic lock plate 14 fixed to the housing 10 having a plurality of lock holes 14a into which a plurality of lock magnets 13 attracted to the shield plate 11 are engaged.
A part of the lock magnet 13 is hooked at the time of locking and has a plurality of recesses 15 for receiving the lock magnet 13 at the time of unlocking, the lock plate 13 is locked to the shield plate 11 at the time of locking, and the lock plate at the time of unlocking And a slide member 16 that slides along 14. Then, of the plurality of lock magnets 13, at least one lock magnet 13 is divided into two magnet pieces 13a and 13b. Further, it is configured by forming a step portion 15a at the opening end of the recess 15 with which the magnet piece 13b on the cover plate 12 side of the magnet pieces 13a and 13b engages.

Here, the magnet pieces 13a, 13b
Are attracted to each other by a magnetic attraction force and are coaxially integrated with each other. As will be described later, when trying to unlock with a fake card, they are eccentric to each other but do not separate.

The shield plate 11 and the cover plate 12 are
The shield plate 11 is arranged substantially directly below the magnetic card insertion slot 10a of the housing 10, and is equipped with the shield plate 11 so as to be movable in the axial direction of the housing 10 with respect to the cover plate 12. It is urged toward the cover plate 12 side by a leaf spring 17 mounted on the.

The lock plate 14 is arranged along the side surface of the cover plate 12. The inner diameter of the lock hole 14a is set to be larger than the outer diameter of the lock magnet 13.

The slide member 16 is made of a non-magnetic material. When the magnetic card A is not inserted, the slide member 16 is attached to the upper side of FIG. 1 by a coil spring 18 arranged between the slide member 16 and the housing 10. It is biased and held in the locked position.

When the slide member 16 is in the locked position, the movement of a known lock mechanism (not shown) is restricted by the slide member 16, and the door knob is locked in a non-rotatable state. When the slide member 16 is in the unlocked position shown by the chain double-dashed line in FIG. 2 as described later, the lock mechanism is released from the constraint of the slide member 16 and the door knob is unlocked so that it can rotate.
Further, the magnetic card A is provided with a magnetic spot a (see FIG. 2) magnetized to the same pole as the magnetic pole of the end surface of the lock magnet 13 on the cover plate 12 side at a position corresponding to the lock magnet 13. ing.

Next, the operation of the magnetic card lock device will be described.

In the state shown in FIG. 1 in which the magnetic card A is not inserted, the lock magnet 13 is the shield plate 1.
In the state of being sucked to 1, it engages with the lock hole 14a of the lock plate 14 and is caught in the recess 15 of the slide member 16, and the slide member 16 is positioned at the locking position by the coil spring 18.

As shown in FIG. 2, the magnetic card A is inserted from the magnetic card insertion slot 10a to the shield plate 11 and the cover plate 1.
When inserted between the two, all the lock magnets 13 are covered by the cover plate 12 due to the magnetic repulsive force generated between the magnetic spots a provided on the magnetic card A and the lock magnets 13.
And slides into the recess 15 of the slide member 16.
As a result, the slide member 16 becomes free, and when the magnetic card A is further pushed in this state, the slide member 16 resists the elastic force of the coil spring 18 and is unlocked as shown by the chain double-dashed line in FIG. Slide to the position by the dimension L to unlock.

Next, as shown in FIG. 3, a plastic fake card B having the same shape and size as the magnetic card A is inserted between the shield plate 11 and the cover plate 12 in the same manner. The slide member 16 slides slightly by the size M. Then, by the slide member 16, the lock magnet 13 is displaced downward in the drawing while being attracted to the cover plate side 12, and the lower inner peripheral surface of the lock hole 14a and the upper inner peripheral surface of the recess 15 are illustrated. Fix it by sandwiching it with the surface. At the same time, the two magnet pieces 13a, 1
The lock magnet 13 divided into 3b has a cover plate 12
The magnet piece 13b on one side is the magnet piece 13a on the other side
With respect to the coaxial state, it is relatively displaced and displaced upward in FIG. Therefore, even if vibration is applied from the outside of the housing 10, the magnet piece 13b is prevented from being caught by the step portion 15a and the lock magnet 13 falling into the recess 15. As a result, the slide member 16 does not become free and maintains the locked state.

Next, when the card B is removed, the slide member 16 slides back upward in FIG. 3, and the lock magnet pieces 13a and 13b return to the coaxial state due to the centripetal action of their own magnetism.

The upper lock magnet 1 in FIG.
3, the upper outer peripheral surface in the drawing is in contact with the upper inner peripheral surface of the recess 15 in the drawing, and the lock magnet 13 in the lower portion in the drawing
(13a, 13b) cover plate 12 side magnet piece 13
In order to allow the upper outer peripheral surface of FIG. 5b to pass through the upper inner peripheral surface of the recess 15 and enter the stepped portion 15a, the outer diameters of the split magnet pieces 13a and 13b are set to the outside of the normal lock magnet 13. The diameter may be made larger than the diameter by a predetermined dimension, or the outer diameter of the lock hole 14a for the magnet piece 13b may be made smaller than the diameter of a normal lock hole by a predetermined dimension.

Further, the present invention is not limited to the one shown in the above-mentioned embodiment, and the point is that, of a plurality of lock magnets, at least one lock magnet is divided into two magnet pieces. However, it suffices to form a stepped portion with which one of the magnet pieces located on the shield plate side engages at the opening end of the recess.

[0025]

As described above, according to the present invention, at least one lock magnet of a plurality of lock magnets is divided into two magnet pieces,
At the opening end of the recess of the slide member, a step portion with which one magnet piece located on the cover plate side engages is formed, so even if a false card is inserted and vibration is applied to the housing from the outside, the lock magnet This prevents the inconvenience that the one magnet piece engages with the step portion and the lock magnet falls into the recess.

[Brief description of drawings]

FIG. 1 is an enlarged cross-sectional view showing a magnetic card lock device according to an embodiment of the present invention when locked.

FIG. 2 is an enlarged cross-sectional view when a magnetic card is inserted.

FIG. 3 is an enlarged cross-sectional view when a fake card is inserted.

FIG. 4A is a sectional view of a recess. FIG. 4B is a front view of the recess.

FIG. 5 is a side view of a door knob equipped with the magnetic card lock device according to the present embodiment.

FIG. 6 is a cross-sectional view of the prior art when locked.

FIG. 7 is a cross-sectional view when unlocking the same.

FIG. 8 is a cross-sectional view of the same fake card when unlocked.

[Explanation of symbols]

 A magnetic card B fake card 10, 50 housing 11, 51 shield plate 12, 52 cover plate 13, 53 lock magnet 13a, 13b magnet piece 14, 54 lock plate 14a, 54a lock hole 15, 55 recess 15a step 16, 56 Slide member 17,57 Leaf spring 18,58 Coil spring

Claims (1)

[Claims] 1. A magnetic shield plate arranged in a housing into which a magnetic card is inserted, and a plurality of locks arranged along the shield plate and engaged with a plurality of lock magnets attracted to the shield plate. A non-magnetic lock plate having a hole and fixed to the housing, and a plurality of recesses for catching a part of the lock magnet when locked and receiving the lock magnet when unlocked. A magnetic card lock device equipped with a slide member that slides along a lock plate, wherein at least one lock magnet among the plurality of lock magnets is divided into two magnet pieces, At the opening end of the concave portion, a step portion is formed in which one of the magnet pieces located on the shield plate side can engage. A magnetic card lock device characterized in that