JPH0249321Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Technical Field of the Invention> The present invention relates to a disk tumbler lock that is applied to, for example, a vending machine.

<Background of the invention> Conventionally, this type of lock has an inner cylinder inserted into an outer cylinder, a side bar between the two cylinders that fixes or releases the inner cylinder from the outer cylinder, and a large number of disks loaded into the inner cylinder. When each disk is rotated by a set amount by operating the key, the side bar comes off the outer cylinder and the inner cylinder rotates. However, in conventional disk tumbler locks, a retainer is interposed between adjacent disks to prevent the disks from rotating together, and a disk return mechanism is provided in the inner cylinder, so that when the key is removed, each disk is is being restored to its original state. A lock of such a conventional structure has a complicated structure and takes time to assemble, and in particular, the ratio of the retainer to the disk is large, which reduces the number of disks and affects the setting of the number of different keys.

<Purpose of the invention> The present invention focuses on rotating a disk with a key having a spiral groove in the axial direction, and achieves a simplified structure and a significant increase in the number of keystrokes. Another object of the present invention is to provide a novel disk tumbler lock that completely prevents picking and is effective in preventing key duplication by arbitrarily setting irregular spiral grooves.

<Description of Embodiments> The outer cylinder 1 of the disc tumbler lock has a cylindrical shape with an open rear surface, the face plate 11 has a circular key hole 12 into which a key shaft fits, and a part of the side bar is formed on the inner surface. A concave groove 13 with which the inner cylinder 2 is engaged is formed along the cylinder axis direction, and the inner cylinder 2 is fitted into the outer cylinder 1.

The inner cylinder 2 has a cylindrical shape with an open front, and a receiving hole 21 on the bottom having a conical bottom surface into which a key tip fits.
A mounting shaft 22 is provided on the outer surface of the bottom wall to protrude from the outer cylinder 1, and a locking rod 23 is fixed to the shaft. A groove 1 of the outer cylinder 1 is formed on the cylinder wall of the inner cylinder 2.
A slit 24 having approximately the same width and length as that of the side bar 3 is formed in the slit 24 and the groove 13.
are engaged. The side bar 3 is a round shaft with a thickness that fits between the slit 24 and the groove 13, and is supported by the outer circumferential surface of a disk 4 in the inner cylinder 2, which will be described later. and is fixed to the outer cylinder 1. Inside the inner cylinder 2, there are a plurality of disks 4.
are stacked and loaded, a circular keyhole 41 is opened in the center of each disk 4, and protrusions 42, 42a are provided facing each other on the diameter line of the inner circumference of the keyhole 41,
On the diameter line of the outer periphery of the disk 4, recesses 43, 43a are formed that are aligned in series and engage the side bar 3 when a key 5, which will be described later, is inserted into a fixed position.

As shown in FIG. 6, the key used in the above lock is a round key with a diameter that fits the outer cylinder face plate 11 and the keyholes 12, 41 of each disk 4.
The protrusion 4 of the disk 4 is provided on the outer periphery of the key shaft 51.
Two spiral disc grooves 52, 52a that are engaged with the disc grooves 2, 42a are formed along the axial direction and 180 degrees out of phase with each other. The entire length of the operating grooves 52, 52a may be a spiral with a constant pitch or an irregular shape, or an arbitrary waveform, a continuation of a waveform and a straight line, etc.
The recesses 43, 43 of each disk 4 are arbitrarily set so that the recesses 43, 43a of the disk 4 are aligned in series when the key is inserted into the fixed position as shown in FIG.
a is set by the position of the corresponding operating groove 52, 52a.

However, in the locked state, as shown in FIGS. 1 and 2, the slit 24 of the inner cylinder 2 fits into the groove 1 of the outer cylinder 1.
3, rotation of the inner cylinder 2 is prevented by the engagement of the side bar 3. At this time, the recesses 43, 43a of each disk 4 are displaced from each other, and the bearing surface 44 on the outer periphery of the disk is prevented from rotating by the engagement of the side bar 3. 3 and maintains a locked state. At this time, in the keyhole 12, the protrusions 42, 42a of each disk 4 protrude from the entire circumference toward the center of the hole.

Now, when inserting the key 5 into the keyhole 41 of each disk 4 for unlocking, the protrusion 42 of the disk 4,
42a sequentially engages with the operating grooves 52, 52a, and the protrusions move relative to the operating grooves 52, 52a in response to insertion of the key, so that each disk 4 rotates in unison. When the key tip 53 fits into the receiving hole 21 at the bottom of the inner cylinder and the key is inserted into the fixed position, the recesses 43 and 43a of each disc 4 are aligned and the side bar 3 is aligned as shown in FIG. is engaged to release the fixation of the inner cylinder 2 from the outer cylinder 1, and when the key is turned in this state, the disc 4, side bar 3, and inner cylinder 2 rotate together, locking the locking rod 23, This will unlock the door.

In the embodiment shown in the drawings, two protrusions 42 are provided in the inner hole 41 of each disk 4, but in practice, each disk 4 has one protrusion 42, and the inner cylinder When loading, by arranging the protrusions of adjacent disks alternately above and below, or to the left and right in relation to the operating groove of the key, a complex key difference can be constructed, and even if there is only one protrusion, By combining this disk and two disks within the range of the total number of disks, it is possible to set a more complex and larger number of key differences.

<Configuration and Effects of the Invention> As described above, in the present invention, a plurality of discs 4 are stacked and loaded into the inner cylinder 2 in order to restrict the side bars between the inner and outer cylinders, and each disc 4 has a A circular keyhole 4 with a disc operating groove formed in the key that fits the key.
1, and a protrusion 42 that fits into the operating groove on the inner surface of the keyhole.
A recess 43 is formed on the outer periphery of the disk so that the keys are aligned in a line when the key is inserted into the fixed position, and each disk is rotated by the operating groove of the key. By arbitrarily setting the increase/decrease or the shape of the key operating groove, an unlimited number of different keys can be realized, and it is difficult to duplicate the key, which is effective for crime prevention. Moreover, since each disk is rotated by the engagement of the protrusion with the operating groove of the key, the present invention eliminates the need for a retainer and a disk return mechanism as in conventional locks, thus making the lock more compact. ,
It has excellent practical effects by simplifying the structure, such as simplifying the structure.

[Brief explanation of the drawing]

Figure 1 is a cross-sectional view of the disk tumbler lock of the present invention.
Figure 2 is a sectional view taken along the line A-A in Figure 1, Figure 3 is a sectional view showing the operating status of Figure 2, Figure 4 is a front view of the disk, and Figure 5 shows the relationship between the disk group and the key. The perspective view shown in FIG. 6 is a front view of the key. 1...Outer cylinder, 2...Inner cylinder, 3...Side bar,
4... Disc, 41... Keyhole, 42... Button,
43... recess, 5... key, 52... disk operating groove.

Claims (1)

[Scope of utility model registration request] An outer cylinder 1, an inner cylinder 2 loaded into the outer cylinder, an inner cylinder,
A side bar 3 disposed between the outer cylinders 1 and 2 to fix or release the inner cylinder from the outer cylinder; and a plurality of discs 4 stacked and loaded in the inner cylinder 2 to restrict the clutching operation of the side bars 3. with each disk 4
This disc tumbler lock has a circular keyhole 41 with a protrusion 42 in its inner hole and a recess 43 in its outer circumferential surface into which a side bar engages.