JPH02279882A - Disc-tumbler lock key - Google Patents

Abstract

PURPOSE:To reduce the cost of manufacture as well as make the miniaturizing process easier for a disc-tumbler lock by a method in which a ward plate with a key hole having wards is put in at least one place in disc-housing grooves of an inner cylinder separately provided. CONSTITUTION:In an inner cylinder 4, grooves 5 are arranged with a given pitch in the axial direction, and discs 6 are set in the other grooves exclusive of at least one in such a way as to push them up by spring. A ward plate 8 having a key hole having ward corresponding to the cross section of a key 1 on its center, having an outside shape matching the grooves 5, is formed by punching process. The plate 8 is set in the vacant grooves of the cylinder 4, and the cylinder 4 is inserted into the outer cylinder 3. Since the front key hole of the cylinder 4 is sufficient to have an oblong form without ward, the key can be easily and cheaply obtained even for small-size ones.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to improvements in disc tumbler locks.

[Conventional technology]

In a disc tumbler lock, the key hole in the inner cylinder,
Alternatively, it is well known to provide a protrusion (hereinafter referred to as a ward) inside the inner cylinder that serves as an obstacle to the key, so that only the key that passes through the protrusion can operate the protrusion.

[Problem to be solved by the invention]

However, the inner cylinder is generally made of turned metal or a die-cast molded product, and the key hole ward or inner ward is molded integrally with the inner cylinder, resulting in a complicated shape, which causes the following problems. occurs.

First, if the disk tumbler lock is to be used, for example, as a data theft prevention lock for a computer, it is necessary to make the disk tumbler lock very small. However, since the ward itself is originally small,
If this becomes smaller as locks become smaller, for example, when processing an inner cylinder with a key hole size of about 4.4" x 1.5 mm, the precision of the molding will have to be very strict. required and prone to molding defects.

Second, since it is necessary to manufacture various inner cylinders for different shapes of the wards of the keyhole, manufacturing costs are high and it is also disadvantageous in terms of inventory management.

The present invention has been made to solve these problems, and aims to reduce the size of the lock, facilitate the processing of keyhole wards, and reduce costs.

[Means to solve the problem]

In the disc tumbler lock of the present invention, for example, as shown in FIG. The disk 6 is inserted into at least one groove 5 out of a group of grooves 5 provided for inserting the disk 6 therein.

[Effect]

In this case, only the key 1 passing through the keyhole 10 of the ward plate 8 can be operated.

〔Effect of the invention〕

In the disc tumbler lock of the present invention, a ward plate 8 having a key hole 10 with a ward 9 is formed separately from the inner cylinder 4, and this is inserted into the groove 5 in the inner cylinder 4. When forming the inner cylinder 4 by metal sawing or die-casting, it is no longer necessary to provide the wards 9 integrally with it, so that the inner cylinder 4 can be easily formed into a simple shape without the wards 9 and miniaturized. be able to.

In addition, when the ward plate 8 is arranged in the inner cylinder 4 in this way, it is effective in preventing picking with a wire or the like as a means of breaking the lock, and the key hole opened on the front side of the inner cylinder 4 is intentionally equipped with a ward plate. Since there is no need to add 9, it is also effective in preventing duplicate keys from being made.

Furthermore, the ward plate 8 itself can be machined into various types easily and inexpensively by the same punching process as the disk 6.

Further, as long as various types of ward plates 8 are manufactured in this way, the inner cylinder 4 only needs to be made of one type having a keyhole shape without wards, and can be provided at a very low cost.

〔Example〕

A first embodiment of the disc tumbler lock according to the present invention
This will be explained based on the drawings to FIG.

In Figure 1, 1 is a key with a notch 2 on only one side, 3
4 is an outer cylinder, and 4 is an inner cylinder inserted concentrically into the outer cylinder 3. These inner and outer cylinders 4 and 3 are each formed by metal sawing or die-casting in the conventional manner.

Inside the inner cylinder 4, nine discs 6 are arranged in a row in the direction of the cylinder axis at predetermined intervals, and discs 6 are inserted into seven of the grooves 5 so that all of them are pushed upward by a spring 7. (See FIGS. 3 and 5). Ward plates 8 are inserted into the remaining two empty grooves 5.

The groove 5 into which the word plate 8 is inserted utilizes an empty groove in the groove 5 into which the disk 6 is inserted. That is, the number of different keys for a disc tumbler lock using a key l with indentations on one side as shown in the illustrated example is generally determined by the type of disc 6 (the type of increments on the key) being n! If the number of inclusions is r, then nF (
However, since we have to exclude cases where the notches are flat (combinations where only the notches of the same depth are the key), the number of different keys that can be used in practice is slightly smaller than this. Therefore, several of the grooves 5 provided for assembling the disk 6 in the inner cylinder 4 are vacant, and the word plate 8 can be inserted into the vacant grooves 5 by using these vacant grooves 5.

The above-mentioned ward plate 8 is formed by punching or the like in the same manner as the disk 6, and has an outer shape matching the shape of the groove 5 as shown in FIG. It is formed to pass through a key hole 10 having a diameter, and is always incorporated into the inner cylinder 4 in a retracted state.

In order to incorporate the ward plate 8 into the inner cylinder 4 in this way, the key hole 11 opened on the front side of the inner cylinder 4 is connected to the ward plate 8.
It is sufficient to form it into a simple rectangular shape without any.

[Another example]

In the above embodiment, the ward plate 8 has key holes 10 of the same shape in the first groove 5 and the seventh groove 5 closest to the front side of the inner cylinder 4, respectively. However, the installation position and the number of installations can be arbitrary.

Furthermore, two or more types of ward plates 8 can be combined. For example, in the case of the shape of the keyhole sword 9 shown in the example, it is also possible to combine two ward plates 8, one having the shape shown in FIG. 6(al) and the other having the shape shown in FIG. 6(b). can.

Furthermore, as in the above embodiment, only one side of the key 1 is notched 2.
The present invention is not limited to a type of disc/tumbler lock in which the disc 6 is pulled downwards by attaching a key 1, but can also be applied to a type of disc/tumbler lock in which notches 2 are made on both sides of the key 1 and the disc 6 is pulled upwards or downwards. .

[Brief explanation of drawings]

1 to 5 show an embodiment of the disc tumbler lock according to the present invention, FIG. 1 is a vertical side view showing the state where the key is inserted, and FIG. Figure 3 is a cross-sectional view taken along the n-line in Figure 1, and Figure 4 is a cross-sectional view taken along the
The figure is a sectional view taken along the line IV--IV in FIG. 1, and FIG. 5 is a longitudinal sectional view showing the key with the key removed. FIG. 6(1) fb) is a front view of a ward plate showing another embodiment of the present invention. 1...Key, 3...Outer cylinder, 4...Inner cylinder, 5...Groove, 6...Disk, 8...Ward plate, 9... Ward, 10...Keyhole. Figure Figure Figure

Claims (1)

[Claims] (1) In a disc tumbler lock consisting of concentric inner and outer cylinders 4 and 3, and a disc 6 inserted into a groove 5 arranged in the inner cylinder 4 in the direction of the axis of the cylinder, a ward 9 is attached. A disc tumbler characterized in that a ward plate 8 having a key hole 10 is constructed separately from the inner cylinder 4, and the ward plate 8 is placed in at least one groove 5 of the group of grooves 5. Tablet.