JPH0358628B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a composite tumbler lock, and in particular, a combination of a so-called magnetic tumbler lock and a so-called disc tumbler lock can completely prevent unauthorized unlocking. This invention relates to a composite tumbler lock.

[Problems with conventional technology]

The original reason for the existence of a lock is that only the holder of a duplicate key, that is, a key with the proper shape and structure for unlocking the lock, can unlock the lock. ) to ensure security in terms of crime prevention.

However, in conventional locks called tumbler locks, a part of the movable tumbler is exposed in the keyhole, so it is not impossible to pick the lock with a wire or the like.

In addition, a certain type of lock called a so-called magnetic tumbler lock has magnetic attraction between a permanent magnet embedded in a duplicate key (hereinafter simply referred to as a key magnet) and a tumbler magnet of a magnetic tumbler movably guided within a cylinder. The magnetic tumbler is configured to move using force and/or magnetic repulsion;
The tumbler is not exposed inside the keyhole. However, it is not technically impossible to know the position of the magnet of a magnetic tumbler from the keyhole, and therefore, although it is more difficult than picking a mechanical tumbler lock with wire, picking a magnetic tumbler lock is difficult. It's not impossible either.

[Purpose of the invention]

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a composite tumbler lock that can eliminate the above-mentioned disadvantages and completely prevent picking.

[Means for solving problems]

In order to achieve the above object, the present invention provides an outer cylinder having a tumbler locking groove formed on the inner peripheral surface along the generatrix;
and an inner cylinder made of a non-magnetic material that is rotatably fitted into the inner hole of the outer cylinder and has a keyhole formed in the axial direction, and the inner cylinder is arranged adjacent to the keyhole along the axial direction of the inner cylinder. A tumbler group consisting of a disk tumbler and a magnetic tumbler that are guided so as to be swingable in the width direction and whose one end is biased in a direction to engage the tumbler locking groove is arranged in a row, and the disk tumbler has a key hole in the tumbler. A composite cylinder is provided with a keyway engaging part facing the tumbler, and a tumbler magnet is provided in a part facing the keyhole of the magnetic tumbler, and a main body made of a non-magnetic material to be inserted into the keyhole of the inner cylinder. A key groove is formed on the side edge of the main body that aligns with the key groove engaging portion, and a key with a key magnet embedded is provided on the side edge that aligns with the tumbler magnet, and a duplicate key is inserted into the key hole. When the key groove of the duplicate key and the key groove engaging part of the disk tumbler are engaged,
In addition, by magnetically engaging the key magnet of the duplicate key and the tumbler magnet of the magnetic tumbler, the tumbler group is moved, and the edge of each tumbler is moved within the shear line, allowing the inner cylinder to rotate. It is characterized by what it did.

Embodiments of the present invention will be described below with reference to the drawings.

〔Example〕

In FIGS. 1 and 2, reference numeral 1 indicates an outer cylinder, and this outer cylinder 1 has a part of the outer cylinder part oval in cross section (see FIGS. 3 and 4) to prevent rotation. It is also a cylindrical body with a male threaded portion for being fixed to a door surface, etc. with a nut (not shown), and the outer cylindrical portion and inner hole have stepped portions for positioning and locking the inner cylindrical portion, which will be described later. has been done.

In addition, on the inner circumferential surface of this outer cylinder 1, there are
As shown in the drawings and FIG. 4, two tumbler locking grooves 2, 2 are formed along the generatrix symmetrically with respect to the axis.

An inner cylinder 3 is rotatably fitted into the inner hole of the outer cylinder 1. As shown in Fig. 1, this inner cylinder 3 is a cylindrical body made of a non-magnetic material with a large diameter at its outer end (the left end in Fig. 1), and the inner end is connected to a locking member, etc. (not shown). A male thread for this purpose is integrally provided in a protruding manner, and a rotation regulation plate 4 having an opening of the same shape is firmly fitted into an irregularly shaped cross-sectional portion connected to this male thread. The rotation regulation plate 4 prevents the inner cylinder 3 from slipping out from the outer cylinder 1, and also has a notch (not shown) formed at its outer end and a protrusion on the inner edge of the outer cylinder 1, for example. The rotation angle of the inner cylinder 3 is regulated by engagement with a provided protrusion (not shown).

Further, as shown in FIGS. 1 to 4, the inner cylinder 3 is formed with a keyhole 5 having a predetermined cross-sectional shape and passing through the inner cylinder 3 in its axial direction.

Furthermore, as shown in FIG.
A plurality of (five in the illustrated embodiment) slots 6, 6 are formed along the axial direction of the slot. As shown in FIGS. 3 and 4, these slots 6, 6 pass through the inner cylinder 3 in the width direction (vertical direction in FIGS. 3 and 4) in proximity to the keyhole 5.

These slots 6, 6 are arranged alternately with narrow and wide slots in FIG.
As shown in FIGS. 1 and 3, a so-called disk tumbler 7 is accommodated in the narrower slots 6, 6 so as to be swingable in the width direction of the keyhole 5.

As shown in FIG. 3, this disk tumbler 7 is, for example, an elongated plate-shaped body, and a first spring hook 7a is attached to the side edge of one end (the upper end in FIG. 3), and the other end is A key groove engaging portion 7b is integrally formed in each of the key groove engaging portions 7b.

On the other hand, at the end of the slot 6 in which the disc tumbler 7 is housed, which is opposite to the keyhole 5 with respect to the disc tumbler 7 (the left end in FIG. 3), an inner cylinder 3 is inserted in the width direction of the keyhole. A penetrating spring storage hole 8 having a circular cross section is arranged in series, and a compressed spring is elastically loaded between a fixing pin 9 driven into an opening at one end of the spring storage hole 8 and the first spring hanging piece 7a. Due to the elasticity of the tumbler spring 11 as a coil spring, the disk tumbler 7 is urged in a direction in which one end (the upper end in FIG. 3) of the disc tumbler 7 engages in the tumbler locking groove 2.

The keyway engaging portion 7b is the disk tumbler 7
It is integrally provided at the other end of the main body on the side opposite to the spring hanging piece 7a, and most of it faces into the keyhole 5 (see FIG. 2). This keyway engaging portion 7b is formed by a cutout edge 12 formed as a result of interference between the keyhole 5 and the slot 6.
As a result, in the locked state where no duplicate key is inserted into the keyhole 5, the disc tumbler 7 stably maintains the position shown in the third figure.

On the other hand, the slots 6, 6 formed in the inner cylinder 3
For each of the wide ranges (see Figure 1),
As shown in FIGS. 1 and 4, a so-called magnetic tumbler 13 is housed in the keyhole 5 so as to be swingable in the width direction.

This magnet tumbler 13 is made of a magnet holder 1 made of a non-magnetic material, which is a rectangular parallelepiped that is elongated in the width direction of the keyhole 5, for example.
3a, a second spring hook 13b integrally coupled to the magnet holder 13a, and a locking piece 13c integrally formed to the second spring hook 13b. On the surface of the magnet holder 13a facing the keyhole 5, two tumbler magnets 1 are placed at a predetermined distance along its length.
4 and 14 are buried with their surfaces exposed. In order to embed the tumbler magnets 14, 14 in the magnet holder 13, for example, the tumbler magnets 14 are buried on the surface thereof.
When the tumbler magnet 14 is a rectangular parallelepiped or a cube as in the illustrated embodiment, an adhesive is interposed between the five sides excluding the surface and the inner surface of the recess to form a tumbler magnet. The magnet 14 is filled in the recessed portion, and the magnet is fixed by solidifying the adhesive. The direction of the main magnetic flux of this tumbler magnet will be described later in connection with that of the duplicate key, which will be described later.

Magnetic tumbler 13 configured as above
As shown in FIGS. 1 and 4, the magnet holder 13a is brought into sliding contact with the slot 6, and the end edge of the second spring hanging piece 13b is connected to the slot 6 as shown in FIG. It is slidably guided to the inner cylinder 3 by sliding in a narrow guide groove 6a. Then, the locking piece 13c is pushed into the tumbler locking groove 2 by the elasticity of the tumbler spring 11, which is a compression coil spring, elastically loaded between the stepped portion formed in the slot 6 and the second spring hooking piece 13b. It is biased in the direction of engagement. In the illustrated embodiment, in the locked state in which no duplicate key is inserted into the keyhole 5, the outer edge of the locking piece 13c comes into elastic contact with the bottom surface of the tumbler locking groove 2 due to the elasticity of the tumbler spring 11. 4. Keep the position shown stable.

In the composite cylinder 10 configured as described above, each of the plurality of disc tumblers 7, 7 and the magnetic tumblers 13, 13 housed in the slots 6, 6 of the inner cylinder 3, as shown in FIG. Each tumbler is biased in the opposite direction to an adjacent tumbler of the same type. In FIG. 1, reference numeral 15 indicates a thin cap that covers the outer end surface of the inner cylinder 3.

On the other hand, a key for unlocking the composite cylinder constructed as described above is constructed as shown in FIG. That is, in FIG. 5, reference numeral 16 indicates the entire key, and the key 16 is made of a non-magnetic material such as zinc alloy, and has a main body 17 having the same cross-sectional shape as the keyhole 5, and a length of the main body 17. The main bodies 17 are located at the same position in the direction and are spaced apart from each other at a constant distance.
The main body 17 has a plurality of pairs of key magnets 18, 18 (three pairs in the illustrated embodiment) embedded in the side surface of the main body 17, and a key groove 19 is formed in the side edge of the main body 17.

The positions of the pairs of key magnets 18, 18 in the longitudinal direction of the main body 17 are determined so that the main body 17 is aligned with the corresponding magnetic tumbler 13 when inserted into the keyhole 5, and the pairs of various magnets 18, 18 shall be set to be the same as that of the tumbler magnets 14, 14 in each magnetic tumbler 13.

In addition, in order to embed the key magnet 18 in the main body 17,
The tumbler magnet 14 in the magnet holder 13a (FIG. 4) may be the same as the tumbler magnet 14, or as in the embodiment shown in FIG. On the edge of the opening, for example, a small convex strip with a sawtooth cross section and a side facing the concave part perpendicular to the side surface of the main body is integrally formed, and a key magnet 1 is placed in the concave part.
8 may be filled and then fixed by crimping the small protrusions.

Furthermore, as shown in FIG. 6a, the key magnet 1
The magnetization direction of each magnet is appropriately set according to the key difference so that the main magnetic fluxes (magnetic fluxes substantially perpendicular to the magnetic pole faces of the magnets) of 8 and tumbler magnet 14 are substantially orthogonal to each other.

Further, the position of the keyway 19 (FIG. 5) in the longitudinal direction of the main body 17 is determined so that it aligns with the disc tumbler 7 when the main body 17 is inserted into the keyhole 5 (see FIG. 7). . In addition, depending on the formation position of the keyway engaging portion 7b of the disk tumbler,
Of course, there are cases where the depth of cut of the keyway 19 becomes zero, and it appears that there is no keyway.

[Effect]

In the composite tumbler lock according to one embodiment of the present invention configured as described above, in the locked state where a duplicate key is not inserted into the keyhole 5, the tumbler spring 1
1, one end of each of the disc tumblers 7, 7 and the magnetic tumblers 13, 13 is engaged in the tumbler locking groove 2 across the shear line, so that the inner cylinder 3 is rotated. Unable to do so, it remains locked.

When the duplicate key 16 is inserted into the keyhole 5, the inclined edge formed at its tip (FIG. 5) resists the elasticity of the tumbler spring 11 and pushes the key groove engaging portion 7b of the disk tumbler towards the side edge of the duplicate key. When the duplicate key 16 is fully inserted onto the edge, the keyway 19 and the keyway engaging portion 7b are aligned, and the elasticity of the tumbler spring 11 causes the latter to slide into the bottom of the former, as shown in FIG. I feel depressed. As a result, the edge of the disk tumbler 7 is aligned with the shear line.

At the same time, a pair of key magnets 18, 18 embedded in the side surface of the main body of the duplicate key 16 is inserted into the corresponding magnetic tumbler 1.
Consistent with 3. Then, as shown in FIGS. 6 and 8, magnetic attraction occurs between, for example, the N pole of each key magnet 18 temporarily fixed to the inner cylinder 3 via the main body 17, and from, for example, the S pole of the corresponding tumbler magnet. power,
In addition, the N pole receives magnetic repulsion, and the magnetic tumbler 1
3 moves in the direction of arrow a in FIG. 6a, and as a result, the edge of the locking piece 13c aligns with the shear line or moves inward from the shear line. The amount of movement of the magnetic tumbler 13 is uniquely determined by the combination of the magnetic force received from the key magnets 18, 18 and the elasticity of the tumbler spring 11.

As a result of the above, the inner cylinder 3 can be rotated relative to the outer cylinder 1, and by turning the duplicate key, the inner cylinder is rotated and a predetermined unlocking operation is performed.

When a different key than the duplicate key is inserted into the keyhole 5, one end of at least one disk tumbler 7 and/or magnetic tumbler 13 straddles the shear line, which of course prevents rotation of the inner cylinder. be.

In addition, as in the illustrated embodiment, the tumbler magnet 1
4 and key magnet 18 are arranged so that their main magnetic fluxes are substantially orthogonal to each other, the combination of magnetic flux directions in a magnet set consisting of one tumbler magnet 14 and one corresponding key magnet, that is, the magnet There are four different keys to move the tumbler in one direction, and in the case of six sets as in the example shown,
4 ⁶ = 4096 ways. Calculation of the number of key differences is not the gist of the present invention, and for example,
Since it is described in Publication No. 23031, detailed explanation will be omitted.

〔effect〕

As is clear from the above description, since the present invention combines a disc tumbler lock and a magnetic tumbler lock, it is physically difficult to simultaneously insert a picking tool for moving a disc tumbler into a narrow keyhole and a picking tool for a magnetic tumbler. physically impossible,
Therefore, picking can be completely prevented.

Furthermore, for the same reason, the number of key differences can be dramatically increased. In other words, in a magnetic tumbler consisting only of magnetic tumblers,
If you reduce the spacing between the magnetic tumblers in an attempt to increase the number of different keys, adjacent tumbler magnets or key magnets will interfere with each other and cause malfunctions, so in reality, the spacing between the magnets in the length (depth) direction of the keyhole cannot be made very small, and therefore the number of magnets cannot be increased, so the number of different keys cannot be increased. On the other hand, by disposing the disk tumbler between the magnetic tumblers as in the illustrated embodiment, it is possible to increase the number of different keys without worrying about the above-mentioned malfunction. For example, if the depth of the cut in the key groove is set to five levels, even a small composite tumbler lock like the one shown in the figure can have 5×5×4096=102400 different keys.

Furthermore, while the inner cylinder is rotating, the disc tumbler is restrained by the inner circumferential surface of the outer cylinder, and therefore the duplicate key cannot be pulled out. No need for a restraining device. That is, due to the principle of the magnetic tumbler lock, it is possible to pull out the duplicate key while the inner cylinder is rotating, and in this case, there is a risk that the door or the like will be left unlocked. To prevent this, conventional magnetic tumbler locks
The structure is similar in principle to the disk tumbler in the illustrated embodiment, and a locking pin (not shown) whose outer end is controlled by, for example, an inclined cam formed on the inner circumferential surface of the outer cylinder is provided on the cylinder side; For example, the tumbler of the present invention is configured such that an opening into which the inner end of the locking pin engages is provided on the side surface of the magnetic key so that the magnetic key can be pulled out only when the inner cylinder is in the locked and unlocked positions. Since there is no need for a lock in principle, the mechanism is not only simplified and manufactured, but also the strength of the key is increased because there is no opening for receiving the locking pin, and various other effects are achieved.

[Modification example]

Note that the present invention is not limited to the illustrated embodiments, and can be implemented with various modifications.

For example, a tumbler magnet and a key magnet may be arranged such that their respective principal magnetic fluxes are approximately parallel to each other.

Further, in the illustrated embodiment, the key magnets and tumbler magnets are arranged in two rows in the key width direction, but they may be arranged in one row, or if the dimensions of the key permit, three or more rows. You can also do this.

[Brief explanation of drawings]

1 is a vertical cross-sectional view along the line shown in FIG. 2 of a composite tumbler lock according to an embodiment of the present invention, FIG. 2 is a front view thereof, FIG. 3 is an enlarged cross-sectional view taken along the line shown in FIG. 1, and FIG. The figures are an enlarged cross-sectional view taken from the line shown in Fig. 1, Fig. 5 is a side view of the duplicate key, Fig. 6 is a line diagram for explaining the operation of the magnetic tumbler, and Fig. 7 is Fig. 3 showing the unlocked state. FIG. 8 is an enlarged cross-sectional view similar to FIG. 4 in the unlocked state. 1... Outer cylinder, 2... Tumbler locking groove, 3...
Inner cylinder, 5...Keyhole, 6...Slot, 7...Disc tumbler, 7b...Keyway engaging portion, 10...
Composite cylinder, 13...Magnetic tumbler, 14
... Tumbler magnet, 16 ... Duplicate key, 17 ... Main body, 18 ... Key magnet, 19 ... Keyway.

Claims (1)

[Scope of Claims] 1. An outer cylinder having a tumbler locking groove formed along the generatrix on its inner peripheral surface, and a non-magnetic material rotatably fitted into the inner hole of the outer cylinder and having a keyhole formed in the axial direction. The inner cylinder is guided along the axial direction of the inner cylinder so as to be swingable in its width direction in proximity to the keyhole, and one end is biased in a direction to engage the tumbler locking groove. In addition to arranging a group of tumblers consisting of a disc tumbler and a magnetic tumbler,
The disc tumbler has a keyway engaging part facing into the keyhole, and the magnetic tumbler has a compound cylinder equipped with a tumbler magnet in the part facing the keyhole, and a non-locking cylinder that is inserted into the keyhole of the inner cylinder. A main body made of a magnetic material, a key groove formed in a side edge of the main body that aligns with the key groove engaging portion, and a key in which a key magnet is embedded in a side edge that aligns with the tumbler magnet. When the duplicate key is inserted into the keyhole, the key groove of the duplicate key and the key groove engaging portion of the disk tumbler are engaged, and the key magnet of the duplicate key and the tumbler magnet of the magnetic tumbler are magnetically engaged. The composite tumbler lock is characterized in that the group of tumblers is moved by moving the edge of each tumbler within the shear line, thereby making the inner cylinder rotatable. 2. The composite tumbler lock according to claim 1, wherein the disc tumbler and the magnetic tumbler are arranged alternately. 3. The composite tumbler lock according to claim 1 or 2, wherein the main magnetic flux of the tumbler magnet and that of the key magnet intersect with each other at approximately right angles. 4. The composite tumbler lock according to claim 1 or 2, wherein the main magnetic flux of the tumbler magnet and that of the key magnet are substantially parallel to each other. 5. The composite tumbler lock according to any one of claims 1 to 4, characterized in that a plurality of the tumbler magnets and key magnets are provided in the key width direction. 6. The composite tumbler lock according to any one of claims 1 to 5, characterized in that the cut depth of the keyway is zero.