JPS584070A - Magnetic lock pin for lock - Google Patents

Abstract

The method starts from a magnet (14) having its opposite ends magnetized such that north and south pole be equally strong. One pole (N) of the locking magnet is connected to the opposite pole (S) of a second magnet (30). A magnetic field is applied to the opposite end (S) of the locking magnet, and is collapsed to reverse the polarity of said opposite end, whereby the strenght of the magnetic pole adjacent the second magnet becomes relatively weak compared to the pole adjacent the magnetic field. Use in order to prevent undesirable interaction between the locking magnets in magnetic locksets.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnetic key actuated locking device or lock. Although the present invention is applicable to locking devices that use magnetic keys of various configurations, this invention describes a locking device that is opened and closed by a relatively flat cart nine key. A locking device of the type described herein is disclosed in U.S. Pat.
No. 95460, No. 4153194, patent application 1986-616
No. 07 (Japanese Unexamined Patent Publication No. 56-25583).

The locking device described above has a sliding block with a plurality of holes or recesses in which a cylindrical magnet is slidably housed. When the locking device is locked, the magnets are attracted into the corresponding holes in the fixed locking plate and prevent the block from sliding and opening the lock. When a predetermined magnetic key is inserted, the magnet deforms and comes out of the recess in the lock plate, allowing the block to slide and the lock to open.

Up to now, the spacing between holes in sliding blocks has been required to be relatively large due to interaction between adjacent magnets. The distance between adjacent magnets should be sufficiently large so that the adjacent magnets move simultaneously or by the action of the adjacent magnets.
It is necessary to prevent a magnet larger than a book from moving in a predetermined manner. Therefore, the number of magnets that can be used within a predetermined area is small, and the number of code combinations is also small.

The main purpose of the present invention is to improve a magnetic key actuated locking device,
The object of the present invention is to obtain a lock in which the spacing between magnets can be narrowed compared to known locks.

Embodiments and drawings illustrating the present invention will be described.

FIG. 1 shows a portion of a magnetically keyed key-actuated locking device having a plurality of laterally extending holes 12 in a non-magnetic slideable block or core 1 and within which are elongated cylindrical magnets 1.
4 is slidably accommodated. A stationary non-magnetic locking plate 16 is provided next to the core 10, and the locking plate 16 locks when in the locked state.
The end of the magnet 14 engages within the hole 18 to prevent downward movement of the core 1o.

A fixed non-magnetic cover plate 20 adjacent to the lock plate 16 is interposed between the lock plate 16 and a fixed magnetizable shield plate 22 . When the shield plate 22 is in the locked state, the magnet 14
magnetically held in place.

A detailed example of the above-mentioned structure is described in Japanese Patent Application Laid-Open No. 56-25583.

FIG. 2A shows a detail of the structure described above, showing that the spacing between adjacent holes 12 is narrower than in FIG.

Assuming that the magnets 14 are magnetized in the usual manner so that both ends have equal magnetic forces N and S in opposite directions, when the spacing between the magnets is narrow, the distance between the N pole of each magnet and the S pole of the adjacent magnet is A magnetic attraction force shown as a solid line arrow in FIG. 2A acts on this. As a result of this, when a correctly encoded card key 24 is inserted, even if the card key has two magnetic north pole points 23 and is configured to expel both the upper and lower magnets 14 from the lock plate 16. One of the upper and lower magnets may remain in the locked position due to the strong action of the adjacent magnet. The interaction of adjacent magnets prevents unlocking with a correctly encoded key.

The opposite case is shown in FIG. 2B, and when the upper and lower magnets in FIG. 2A have opposite polarities and there is a person inside the lock plate 16, both ends of the magnets are attracted to each other and the ends of both magnets are placed in parallel positions. A magnetic force acts. When one magnet is ejected by the cartno spot 2'5, the other magnet moves into the unlocked position without the corresponding spot. This results in the lock being opened by a cart 9 that is not correctly coded.

Another disadvantage of having conventionally magnetized magnets in excessive proximity is that when multiple magnets are entered into the core 10 via a correctly coded magnetic card key, the key is removed. Even if the attraction force of the shield plate 2 is applied, a part of the magnet may not return to a predetermined position within the lock plate 16.

According to the present invention, in order to eliminate the above-mentioned drawbacks, the strength of magnetization of each magnet at the end opposite to the end cooperating with the locking plate 16, that is, at the end remote from the locking plate, is significantly weakened.

As shown in FIG. 6, the inner end S pole of each magnet 14 has weaker magnetization than the opposite end N pole. The fact that the mutual attraction between the magnets 14 is weak is indicated by dotted arrows in FIG. A correctly coded key 24 will reflect the upper magnet 14 in the example of FIG. 5, but the lower magnet will remain in the locked position since it is only exerted a small influence by the upper magnet.

The method for obtaining this result is shown diagrammatically in FIG.

Magnet 14 is preferably made of Alnico grade 6 material and is first magnetically connected to another magnet 50 having a somewhat stronger magnetic force than magnet 14. A suitable example of magnet 30 is ceramic. For example, if the magnetic force of each pole of the magnet 14 is about 500 Gauss, the magnetic force of the ceramic magnet 30 is preferably about 600 Gauss.

Next, a strong magnetic field is applied to the S pole of the magnet 14 by a capacitor discharge device. The discharge device has a core 32 and a winding 4. A device of this type is described in US Pat. No. 4,128,851. An opposite magnetic field is applied to reverse the polarity of the upper pole of the magnet 14 from S to N as shown in FIG.

Although this magnetic field reversal effect has sufficient force to reverse the polarity of the upper S pole of the magnet 14, it has a weak effect on the opposite pole, and the lower pole becomes a weak S pole as shown in FIG. .

In the example above, the new north pole would be approximately 450 Gauss and the opposite south pole would be less than 200 Gauss.

The reasons for the above results are believed to be as follows. The charge producing the new north pole is strongly concentrated on the surface of the upper end of the magnet 14, while the charge of opposite polarity producing the south pole at the opposite lower end is dispersed or neutralized within the magnet, thus causing a strong concentrated magnetic field. does not occur. This result shows that the influence of the magnetic field reversal effect at the upper end of the magnet is exerted downward within the magnet, but the permanent magnet 3
It is counterattacked by 0's strong magnetic field and becomes powerless.

The steel magnet magnetized as described above is not attracted to the magnet 50 but to the end of the magnetized core 32. The magnet can be housed end-to-end in a long cylindrical holder. A magnet of suitable material and dimensions can be easily loaded into block 10 of FIGS. 1-5 without appreciably altering its storage magnetic properties. By applying a predetermined coloring to the strong end of each magnet, the polarity and strength can be directly identified.

Magnet diameter approximately 0.100 inches (approximately 2.5 inches) Length approximately 0
．． 215 inches (approximately 5.4 mx) and the above magnetization, the center distance is 7/32I n (approximately 5.6111+t) (7
) arrangement, such as U.S. Pat.
It can be used in the complex locking device described in No. 55194.

Although the embodiments described above have shown examples of magnets of a particular polarity, the opposite polarity can also be used.

[Brief explanation of the drawing]

Fig. 1 is a partial sectional view showing the locked state of the magnetic card key lock device, Fig. 2N is an enlarged partial cross-sectional view of a part of Fig. 1, and Fig. 2B is the same as Fig. 2A, but different. FIG. 3 is the same as FIG. 2A but shows the operation of the magnet according to the present invention. FIG. 4 shows an embodiment of the method of magnetizing a lock magnet according to the present invention. 5 is a diagram of the magnet obtained according to FIG. 4. 10 Ni block 12.18: Hole 14: Magnet 16: Lock plate 20: Cover plate 22: Seal plate 2 Loop spot 24: Coat 9 coated car key lobe 2: Core 34: Winding wire

Claims (1)

[Claims] 1. A locking device having two magnets spaced apart from each other and arranged in parallel, one pair of corresponding ends of the magnets being magnetized to produce a relatively weak magnetic field, and the other being magnetized to produce a relatively weak magnetic field. A magnetic lock device characterized in that an end portion is magnetized to generate a relatively strong magnetic field. 2. The device according to claim 1, wherein the magnet is arranged parallel to the longitudinal axis and includes a device that supports the magnet movably in the longitudinal direction. 2. A device according to claim 1, further comprising a slidable core, said magnet being slidably supported within said core. 4. A method for manufacturing a lock magnet for a lock operated by a magnetic cart key, in which a lock magnet whose both ends are magnetized to produce N and S poles of equal strength is prepared, and one end of the lock magnet is The oppositely polarized ends of the second magnet are magnetically connected, and a magnetic field is applied to and deforms the opposite end of the locking magnet to reverse the polarity of said opposite end, thereby locking the locking magnet. A method for manufacturing a lock magnet for a lock device, characterized in that the strength of the magnetic pole at one end of the magnet is made weaker than the strength of the magnetic pole at the other end. 5. The method according to claim 4, characterized in that the strength of the magnetic field of the second magnet is made stronger than the magnetic field of the adjacent pole of the lock magnet. 6. A magnetic key actuated locking device, wherein a slidable core that is moved from a locked position to a released position by a properly coded magnetic key has a plurality of recesses each accommodating a magnetized bottle, each pin in a recess. In the locking device, the locking device is slidable between a locked position and a released position, the magnetization of one end of the set of magnetized pins producing a relatively weak magnetic field and the magnetization of the other end of the set of magnetized pins. A locking device characterized in that magnetization produces a relatively strong magnetic field. Z. The device according to claim 6, characterized in that a relatively weak magnetic field is applied to the inner end of the recess of the magnetization pin.