JPS6351579A - Lock - Google Patents

Abstract

(57) [Abstract] 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 lock installed on a door of a home, a business office, etc., particularly as a boundary with the outside world.

In conventional locks, the lock and key are made more complex to prevent the lock from being opened using a simple gong. Locks and keys need to be updated. In particular, in recent years, keys have been easily duplicated in cloth, and this has led to the use of keys in rental offices, apartments, and residential buildings where users or residents change relatively frequently. There is a drawback that sufficient security cannot be guaranteed unless the lock and key are renewed each time the person or resident changes, and this cost is also a drawback that cannot be ignored. Furthermore, with conventional keys, due to the 11-key structure, large torque and stroke cannot be obtained, and the lock's grooved top lock body must be installed on the door, which reduces its robustness. There was also the drawback that there was a limit to certainty.

The present invention aims to solve the above-mentioned disadvantage (5).Even if the key is lost or stolen, or the user or resident of the room or residence changes, there is no need to renew the lock body, and the key can be locked. Safety guarantees can be easily achieved by replacing the permanent magnet attached to the shore, or by increasing or demagnetizing it to a different magnetic flux density, and by simply readjusting the electrical circuit of the sensing device. I made it possible.

Furthermore, due to the structure and shape of conventional locks and keys, we installed only an escape hole, a sensing device, and an insertion hole in the door, instead of the general concept of installing the lock body inside the door. It is also possible to arrange the main body and other required equipment to be installed on opposing pillars or in a distributed arrangement within the wall.Furthermore, it is also possible to install only an insertion hole in the door, and to cut out the escape hole and other required equipment. , installed on opposite pillars or within a wall. By adopting an arrangement that is completely opposite to the conventional concept, the robustness and reliability of the lock can be increased, the structure of the door can be simplified and its cost can be reduced, or the lock can be tightened with ease. It also offers advantages such as being able to renew the door.

The present invention will be described in detail below with reference to the drawings.

FIG. 1 shows the basic principle to which the present invention is based.
It shows 1σ1j of the change in electrical resistance value of a magnetoresistive element due to the application of a magnetic field to the element. The horizontal axis is the magnetic flux density applied to the element, and the vertical axis is the magnification of the change in electrical resistance of the element corresponding to that value. It can be seen from this curve that, for example, at a magnetic flux density of 3 kilogauss, the electrical resistance value of the magnetoresistive element increases to a value about three times the value when no magnetic field is applied.

There are many methods for extracting this increase in electrical resistance value upon application of a magnetic field as an electrical signal, and here, as an example, a universal bridge type circuit shown in FIG. 2 will be explained. Of course, the application of the present invention is not limited to bridge circuits only, and for the sake of simplicity, the bridge circuit will be described as an example from here on as well. In Fig. 2, Z-work, Z2, Z3, and VZ4 each indicate the load, and 1
indicates an output circuit, and 2 indicates a power supply. It is widely known that the equilibrium condition for the current in the output circuit to become zero is Z1Z4=Z2Z3.

FIG. 3 shows a configuration example when a bridge circuit is employed in the present invention. In the figure, 3 is a variable resistor, 4 is a magnetic resistance element, and 5 is a permanent magnet.

In the present invention, when the permanent magnet 5 attached to the key comes into contact with the magnetic resistance element 4, it is easy to adjust the variable resistor 3 to 1, 1, which satisfies the above condition ZIZ4=Z2Z3. be. In the state adjusted to l'f2, insert the key equipped with a magnet into the hole, and place the magnet in the specified position.
The current flowing through the output circuit l becomes zero by contacting the magnetoresistive element directly or through an iron piece, and by transmitting this as a signal to the main body of the lock, the insertion rod of the vaginal lock is pulled out. You will be performing an action. In this case, it is natural that the present invention also includes a combination of a plurality of variable resistors 3.

If the key is lost, stolen, or the resident changes, replace the magnet attached to the object with a magnet with a different magnetic flux density, and adjust the variable resistor again to meet the conditions of ZIZ4-Z2z3. All you have to do is satisfy. By doing this, the previous key can no longer be used as a knife for vaginal locks.

In reality, when the number of magnets is one, the number of magnet seeds distributed to each sufficiently differentiated magnetic flux density is small, which poses a problem from the standpoint of ensuring safety. In order to solve this problem, as shown in FIG. 4, a plurality of magnetoresistive elements 4-a, 4-b,
4-c and 4-d, a plurality of permanent magnets, 5-a
, 5-b, 5-c, and 5-d are also within the scope of the present invention.

In the figure, the magnetoresistive elements are arranged in series, but not only in series but also in parallel or series-parallel arrangement, which are all included in the present invention, and it is also possible to use a plurality of magnetoresistive elements other than the four shown in the figure. Of course, Yuba is also included in the present invention. The electrical resistance value of these magnetoresistive elements 4 in the absence of a magnetic field and the rate of change in resistance value when a magnetic field is applied can be freely selected, and the magnetic flux density of each permanent magnet 5 can also be set as follows. It can be selected freely and is attached to the key so that when the key is placed in a predetermined position in the escape hole, the magnetic resistance element 4 and the permanent magnet 5 come into contact at opposing positions.

Even in the case of the arrangement as shown in FIG. 4, adjustment using the variable resistor 3 is easy. When it is necessary to change the lock, change the magnetic flux density of any one of the plurality of magnets and adjust the variable resistor 3 again, making the lock completely different from the previous lock. A combination of locks and keys with different characteristics can be obtained, and safety guarantees can be maintained.

In this way, it is easy to understand that many different combinations can be obtained by using a plurality of magnetoresistive elements 4-a to 4-dl and a plurality of permanent magnets 5-a to 5-d. be. It is easy to combine a larger number of units, and virtually infinite combinations are possible, and safety can be ensured.

FIG. 5 shows an embodiment of claim 2-(3), and FIG.
The figure schematically shows the embodiment of 2-(4).

In both figures, 6 is the keyhole, and 7 is the 4-
A group of magnetoresistive elements as shown in a to 4-d, 8 is a lock body, 9 is an insertion rod, 10 is an insertion hole, 11 is a hinge, 12 is an electric wiring, 13 is a door, and 14 is a pillar that comes into contact with the door, a wall, etc. shows. Of these, the solid lines indicate the parts that can be seen from outside or outdoors, and the dotted lines indicate the parts that cannot be distinguished.
This indicates a portion housed inside a door, wall, pillar 14, etc. In FIG. 5, especially regarding the variable resistor 3 or the variable resistor group 3, rather than storing them inside the door 13,
It is convenient to store it in a position on the wall or column 14 where it can be easily readjusted, and in such a way that the adjusted position is not changed by some external force.

The lock body 8 in FIGS. 5 and 6 naturally includes a drive mechanism, a power source, and equipment such as a backup power source in case of a power outage or a storage battery, but the system and structure of the drive mechanism are different. It goes without saying that the use of any number of types of power sources falls within the scope of the present invention. It is obvious that the conventional concept of housing all the components inside the door 13 and installing only the insertion holes 10 in the pillars and walls 14 also falls within the scope of the present invention.

As explained above, the present invention has high robustness and reliability, and is safe even when a key is lost, stolen, or changed by a user or resident indoors.

It is a lock that is characterized by being easy to guarantee and reliable at low cost, and is extremely useful for the safety and security of citizens, as well as for the safety and security of various business establishments. It is very effective industrially.

[Brief explanation of drawings]

Fig. 1 is a diagram showing the relationship between magnetic flux density and rate of change in electrical resistance in a magnetoresistive element, showing one example; Fig. 2 is a general diagram of a bridge type circuit, which is an example of a signal generation circuit; The figure is a schematic diagram of a case in which a magnetoresistive element and a variable resistor are mounted in a bridge-type circuit and used as a key, and Figure 4 is a schematic diagram of an example in which multiple magnetoresistive elements and permanent magnets are used. FIGS. 5 and 6 are explanatory diagrams schematically showing examples of actual application of the present invention. In the figure, 1 is an output circuit, 2 is a power supply, 3 is a variable resistor, 4 is a magnetic resistance element, 5 is a permanent magnet, 6 is a keyhole, 7 is a group of magnetic resistance elements, 8 is a lock body, 9 is an insertion rod, 10 is the insertion hole, 1
1 is a hinge, 12 is electrical wiring, 13 is a door, and 14 is a structure such as a pillar or wall.

Claims (4)

[Claims] (1) When unlocking a door to be locked, in a lock in which the insertion rod of the lock is pulled out by power, a key fitted with a permanent magnet is brought into contact with the key as a signal to give an instruction to start the operation. A lock characterized by using a signal generated when the electrical resistance value in a magnetic resistance element increases to a specified value. (2) A lock characterized in that the number of both the magnetic resistance element as the sensing device and the permanent magnet attached to the key as the stimulation device is plural. (3) The lock is characterized in that the various functional parts of the lock, other than the insertion hole that contacts the insertion rod, are distributed and installed on both the door and the pillar or wall that contacts that surface. A lock. (4) The lock is characterized in that only the insertion hole that comes into contact with the insertion rod is installed in the door, and the other functional parts that make up the lock are installed in the pillar or wall that comes into contact with the surface of the door. A lock.