JPS585349B2 - magnetic tumbler lock - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention includes an inner cylinder that pivots within an outer housing, the inner cylinder having a key-receiving bore and at least one magnetic locking member, the locking member extending along its longitudinal axis. The present invention relates to a magnetic tumbler lock which is rotatable about an axis and whose key is provided with a magnet that cooperates with a magnetic tumbler.

Such a lock is known from German Patent No. 1,553,365.

In this known structure, the locking member is magnetized and
So the center line of magnetic flux extends along a straight line.

When the locking members approach each other in such a configuration, the locking members interact with each other;
Therefore, when the key is inserted, the locking member is not rotated to the correct unlocked position.

To overcome this problem, the distance between the locking members must be increased, but since the number of locking members arranged within a certain length of the inner cylinder is limited, the cooperating weight magnet The number of changes in the arrangement with respect to the member magnet is considerably small.In order to eliminate the drawbacks of this known structure, the present invention proposes that the weight magnet 1 (the reference numerals in the drawings are used hereinafter) and the groove 2a. The magnetic flux formed between the magnetic poles of the key locking member 2 rotating within the weight magnet and the locking member 2
It is magnetized so that at least a main portion thereof extends parallel to the rotation axis of the locking member 20, that is, to form a magnetic flux centered on the rotation axis of the locking member 20 having a substantially elliptical shape.

Such a configuration of the present invention has the following advantages.

(a) Due to the above-described orientation of the magnetic flux, there is no leakage of the magnetic flux, and the influence of the magnetic flux on the neighboring locking members 2 is significantly less than in the conventional structure.

The locking members can therefore be placed fairly close to each other and a large number of locking members can be accommodated in a lock of a certain length.

As a result, the number of key differences can be dramatically increased.

(b) Compared to the case where the magnetic flux is formed on one side of the rotating shaft as in, for example, JP-A-49-134500, the present invention arranges the magnetic flux on both sides of the rotating shaft, making the locking member smaller. be able to.

This is because, in the present invention, the entire surface of the locking member to be magnetized can be used to form the magnetic poles.

(e) Since a magnetic flux is formed around the rotation axis I-I, when the locking member rotates, the magnetic rotation is accompanied by a self-extracting action. Therefore, the sliding resistance with the inner circumferential wall of the groove 2a is The amount of rotation is small, and the rotational operation is smooth.

The invention will be explained in detail below with reference to embodiments of the structure according to the invention, which are illustrated in the accompanying drawings.

FIG. 1 schematically shows the arrangement of a weight magnet and a magnetic locking member in order to explain the present invention in detail.

FIG. 2 is a plan view of a plurality of weight magnets used in the structure according to the present invention.

FIG. 3 is a perspective view of several key magnets shown in FIG. 2.

FIG. 4 shows a plan view of the conical surface and of two embodiments of the other surfaces of the same key, as well as several possible arrangements of the weight magnets.

FIG. 5 shows an embodiment of the lock according to the present invention, and is a sectional view of the key inserted into the lock.

FIG. 6 is the same cross-sectional view as FIG. 5 with the key removed.

FIG. 1 is a perspective view of a locking member used in the lock shown in FIGS. 5 and 6. FIG.

FIG. 8 is a sectional view taken along line A--A in FIG. 5.

Figure 9 shows the position of the rotary locking member when the key is inserted into the lock.

Figure 10 shows the position of the locking member when the key is removed from the lock.

FIG. 11 is a cross-sectional view of the locking member.

Figure 1 shows the weight magnet 1 occupying a certain position on the key and the center line I.
The arrangement of the locking member 2, which is disposed within the lock so that the locking member can rotate around -I, is approximately the same as that shown in FIG.

As is clear from FIG. 1, the center line 3A of the magnetic flux extends along a curved curve VC across the body of the locking member, and extends at the south pole S in a direction perpendicular to the top surface of the locking member and parallel to the axis of rotation. The locking member 2 is magnetized such that it enters the upper surface and leaves the locking member body at the north pole N in a direction parallel to the direction in which it enters the south pole.

Furthermore, as seen in FIG. 1, the lower end of the weight magnet 1 is magnetized in the same way as the upper end of the locking member 2.

When the weight magnet 1 is held above the locking member 2 body in the position shown in FIG. 1, the north pole of the locking member body faces the south pole of the weight magnet, and the south pole of the locking member faces the south pole of the weight magnet, as shown in FIG. It is clear that the locking member body rotates about the rotation axis II until it faces the north pole of the weight magnet.

FIG. 1 further shows that the upper end of the weight magnet remote from the locking member 2 shown in FIG. and the south pole are arranged at desired positions independently of the north and south poles at the lower end of the weight magnet.

This upper end cooperates with a locking member (not shown) located above the weight magnet.

Of course, the positions of the north and south poles of this locking member are the same as the positions of the north and south poles at the upper end of the weight magnet in order to move this locking member to the correct position when the weight magnet faces the locking member. must be done.

FIG. 2 is a plan view showing the actual flow side of the weight magnet, where the positions of the north and south poles on the upper part of the weight magnet are shown by solid lines, and the lower part is shown by broken lines.

FIG. 3 is a perspective view of the actual flow side shown in FIG. 2, and shows an embodiment in which only one side is magnetized.

FIG. 4 shows many possible examples with the structure according to the invention.

The left side of FIG. 4 shows rows of weight magnets a, b, and c, and another row of weight magnets d, e, and f parallel to these rows.

The arrangement of the north and south poles of the six weight magnets on the side surface of the key shown on the left side of FIG. 4 may be in any desired pattern.

By magnetizing the weight magnet in the manner described above, this pattern becomes independent of the north-south north-south pattern of the weight magnet on the other side of the key, so that for the pattern on the left side of FIG. The same weight magnets are denoted by a' to f'.
This becomes the pattern in the center of the figure or the pattern on the right side in FIG. 4 indicated by the same weight magnets a'' to f''.

In fact, the position of the north and south poles of the locking member must correspond to the pole position of the weight magnet which cooperates with said locking member in order to place the locking member in the correct position when the key is inserted into the lock.

It is clear that in this way a particularly large number of combinations can be obtained with a relatively small number of locking elements.

One embodiment of a lock based on the principles of the present invention is shown in FIGS. 5-8.

The lock shown in these figures has an outer housing 4.

The inner cylinder 5 is rotatable within the housing about a longitudinal axis.

This cylinder has a keyhole 9 into which the key 3 is received.

Two parallel rows of holes 8, 10 are provided on either side of the keyhole, and the rotary locking member 2 is configured such that each locking member moves within a groove 2a shown in FIG. 8 about an axis of rotation independent of the other locking members. It is arranged to be rotatable, the axis of rotation coinciding with the longitudinal axis of the locking member.

As is clear from Figures 5 and 6, the axes of rotation of these locking members are all parallel to each other, and the axis of rotation of one row of locking members on one side of the keyhole is different from that of the other one on the other end of the keyhole. It is provided in the same plane as the axis of rotation of the locking members of the row.

As shown in Figure 7, each locking member is formed by a body having a regular cross-sectional shape, while having a groove in the free outer end of this body remote from the keyhole, this groove being perpendicular to the axis of rotation of the locking member. It is formed by a first surface 11 and a second surface 11A parallel to the rotation axis.

Two rows of locking members on one side of the keyhole cooperate with a bolt bar 6 extending parallel to the longitudinal axis of the lock.

Each bolt rod 6 is pressed by a plurality of springs 7 held between the inner cylinder 5 and the bolt rod 6.

Accordingly, the spring forces the bolt rod 6 into the outer housing 4 which is provided with two grooves 12 in which the outer parts of the bolt rod 6 are received.
Push outward in the direction of the inner circumference.

It is clear then that if the bolt rod 6 is retained in the slot 12 in the manner shown in FIG. 6, the inner cylinder 5 will not pivot relative to the outer housing 4.

When the key is removed from the keyhole, the interacting magnetic forces of the locking members cause them to rotate relative to each other, so that the positions of the locking members become irregular as shown schematically in FIG.

In this position of the locking member, the free end of the locking member is below the bolt rod as shown in FIG.
The bolt rod does not move inward and cannot rotate into the outer housing of the inner cylinder.

When the correct key 3 is inserted into the drilled hole and the correct weight magnet is opposed to the cooperating locking member, the locking member is rotated so that the second surface 11A of the locking member in each row forms the unit shown in FIG. A second surface 11A of two rows of locking members aligned in plane E-E, where they are on the same side of the keyhole.
face each other.

As shown in FIGS. 9 and 5, two rows of locking members on one side of the drilled hole into which the bolt rod is inserted due to the inclined wall of the slot 12 when the inner cylinder is turned by the key. A slot is formed between the free outer ends of.

The above arrangement of bolt rod and locking rod has many advantages.

The locking member has a simple shape and is easy to manufacture.

The formation of the slot 12 extending in the longitudinal direction of the housing 4 is not difficult.

When locked, rotation of the inner cylinder 5 into the outer housing 4 is prevented by the solid bolt rod 6 and not by a relatively weak locking member.Attempting to rotate the inner cylinder without using the correct key For example, the locking member is pressed against the bolt rod, but the locking member resists pressure loads better than shear loads.

Generally, magnetic components are made of materials with relatively low mechanical stiffness, and this material can sometimes fracture.

From the above, according to another feature of the invention, the locking member is fitted.

A first layer 21 is preferably made of copper, which has a long affinity with magnetic materials, and a second outer layer 22 is made of nickel, which has good mechanical properties such as wear resistance and low friction.

Although FIG. 11 shows the thickness of the layers with exaggerated dimensions for clarity, these layers are so thin that they add very little to the weight of the locking member.

[Brief explanation of the drawing]

FIG. 1 schematically shows the arrangement of a weight magnet and a magnetic locking member in order to explain the present invention in detail. FIG. 2 is a plan view of a plurality of weight magnets used in the structure according to the present invention. FIG. 3 is a perspective view of several key magnets shown in FIG. 2. FIG. 4 shows a plan view of the conical surface and two embodiments of other surfaces of the same key, as well as several possible arrangements of the weight magnets. FIG. 5 shows an embodiment of the lock according to the present invention, and is a sectional view of the key inserted into the lock. FIG. 6 is the same cross-sectional view as FIG. 5 with the key removed. FIG. 7 is a perspective view of a locking member used in the lock shown in FIGS. 5 and 6. FIG. FIG. 8 is a sectional view taken along line A--A in FIG. 5. Figure 9 shows the position of the rotary locking member when the key is inserted into the lock. Figure 10 shows the position of the locking member when the key is removed from the lock. FIG. 11 is a cross-sectional view of the locking member. 1... Key magnet, 2... Locking member, 3... Key, 4...
...outer housing, 5...inner cylinder, 6...bolt rod, 1...spring, 8...hole, 9 keyhole, 10...hole, 11
...First surface, 11A...Second surface, 12...Slot hole.

Claims (1)

[Claims] 1: an outer housing 4; an inner cylinder 5 which is rotatable within the outer housing 4 and has a keyhole 9 for receiving the key 3; It consists of at least two opposing magnetized locking members 2, which are accommodated in a locking manner, and a bolt rod 6 for making the inner cylinder 5 immovable relative to the outer housing when locked, and the bolt rod 6 when locked. It engages with the slot 12 of the outer housing 4, is fixed in position by the locking member 2, and is positioned astride the shear line, and when the key 3 is inserted into the keyhole 9 to unlock, the weight magnet 1 and the locking In a magnetic tumbler lock in which the magnetic poles of the members 2, 2 cooperate to rotate the locking members 2, 2, and the position of the bolt rod 6 is released, the weight magnet 1
The magnetic velocity formed by the magnetic poles of the weight magnet 1 and the locking member 2 curves and passes inside each of the weight magnet 1 and the locking member 2, and the shape as a whole is approximately approximated to an ellipse. The magnetic flux on both sides of the elliptical shape connecting the respective magnetic poles of the locking member 2 is
- The magnetic flux of the locking member 2 is magnetized by the weight magnet 1 so that the locking member 2 rotates around the rotation axis I-I. Magnetic tumbler lock. 2. The magnetic tumbler lock according to claim 1, wherein the locking member 2 is made of metal. 3. The magnetic tumbler lock according to claim 2, wherein the locking member 2 is coated with a nickel outer layer.