JP3133953B2 - Pullout prevention lock - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lock for a cylinder, and more particularly to a lock for preventing the cylinder from being pulled out by screwing a screw into a key groove of the cylinder lock to remove the screw.

[0002]

2. Description of the Related Art In general, a conventional pull-out / break prevention lock is proposed in which a hard cap 7 having substantially the same diameter as an outer cylinder is attached to the front of an inner cylinder 6 of a cylinder lock 5 as shown in FIGS. It had been. A key groove 8 is formed in the hard cap 7 to prevent the hard cap 7 from being broken by aiming at the key groove 8 and the contact surface between the inner cylinder and the outer cylinder. In addition, the hard cap 7 also prevented breakage due to forsaw. Further, the hard cap 7 prevents the screw thread from being crushed and prevented from being screwed in, against the breaking method in which a screw is screwed into the key groove 8 and the screwed screw is pulled out with a bar or the like.

FIGS. 8 and 9 show another conventional example. In this embodiment, the entire inner cylinder 9 is made of a hard member. In such a configuration, even if an attempt is made to screw a screw into the keyway 8a for breaking, since the entire inner cylinder 9 is made of a hard member, even if an attempt is made to screw a screw from the keyway 9a, the screw is not used. The mountain is crushed and cannot be screwed.

[0004]

However, in the above-described conventional pull-out / break prevention lock shown in FIGS. 6 and 7, since the thickness of the hard cap 7 is limited, screws having a pitch larger than the thickness of the hard cap must be used. When the screw is inserted, the screw can be screwed from the keyway 8 over the cap 7,
There is a possibility that the cylinder may be pulled out and broken by pulling out the screwed screw with a bar or the like. Further, even in an example in which the entire inner cylinder is made of a hard member as shown in FIGS.
When the screw is hammered into the key groove, the hammered screw is deformed and bites into the key groove portion of the inner cylinder, and as a result, the cylinder may come off.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-described conventional disadvantages, and to screw a screw into a keyway of an inner cylinder,
An object of the present invention is to provide a pull-out breakage lock in which a cylinder does not come off even when struck.

[0006]

According to the present invention, there is provided a pull-out / break prevention lock according to the present invention, wherein an inner cylinder having a keyway formed of a hard member, an outer cylinder rotatably supported by the inner cylinder, A cylinder lock provided with a regulating means for regulating and controlling the rotation,
In the keyway portion of the inner cylinder, at least the front of the inner cylinder
From the back by a distance longer than the pitch width of the screw
In the depth direction from the going part and in the longitudinal direction of the inner cylinder
Expand the keyway on both sides along the way and fit the screw
That is, an unfolded portion is provided.

[0007] The expanding portion may be formed in a key width direction of the key groove.
In the middle position of

As described above, according to the pullout prevention lock according to the present invention, the cylinder cannot be pulled out even if the screw is driven into the inner cylinder of the cylinder lock.

[0009]

An embodiment of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a cross-sectional view showing a pull-out breaking prevention lock of the present invention, and FIG. 2 is a front view showing the pull-out breaking prevention lock. Here, the pullout destruction prevention lock 10 is attached to the keyway 1.
1 is formed of an inner cylinder 12 and an outer cylinder 13 on which the inner cylinder 12 is rotatably supported.

[0010] The inner cylinder 12 is made of a hard member, and even if a screw or the like is screwed into the key groove 11, the screw thread is crushed. In this embodiment, the keyway 11 is formed to have substantially the same dimensions as the key from the front side to the depth of H,
The central portion 11a deeper than that expands to both sides. H
Are formed with a size of about 2 to 5 mm, which is larger than the pitch of a normal thread. The depth of the rear end 11b with which the tip of the key is engaged is again approximately the same as that of the key.

The regulating means for regulating and controlling the rotation of the inner cylinder 12 comprises a driver pin and a tumbler pin urged by a spring into a pin hole (not shown) formed through the outer cylinder 13 and the inner cylinder 12. A pin tumbler method may be used, or a lever tumbler method or a disk tumbler method may be used.

Next, the effects of the pull-out / break prevention lock 10 configured as described above will be described. First, when a screw is to be screwed into the key groove 11 of the inner cylinder 12 in order to pull out and break the inner cylinder 12, the thread is crushed by the key groove 11 made of a hard member, and the screw cannot be screwed. Further, since the depth H of the key groove 11 is longer than the pitch width of a normal screw, it is not possible to cross the key groove 11 between the thread pitches.

Further, when the screw is driven into the key groove 11, the width of the screw to be fitted is H, and the screw is not fitted at the far end. Therefore, even if the screw is pulled out in this state, there is no danger of the cylinder being pulled out and broken. As described above, the pull-out destruction prevention lock of this embodiment cannot be pulled out and broken by the screw. FIG.
As shown by an imaginary line, when the key 18 is inserted into the key groove 11, the entrance and the rear end of the inner cylinder 12 are normal key grooves, so that the inserted key 18 does not rattle.

FIG. 3 is a cross-sectional view of an inner cylinder showing another embodiment of the pull-out / break prevention lock, FIG. 4 is a front view showing a state in which a cap of the inner pipe is removed, and FIG. It is a front view which shows the state which attached the cap. Here, the inner cylinder 14 of the present embodiment has a key groove 15 and an expanded portion 15a formed over the entire length on both sides thereof. When the key 16 is inserted into the key groove 15 as shown in FIG. 4, the expanding portion 15a is located at the middle of the key 16 in the width direction. Therefore, since both ends 16a and 16b in the width direction of the key 16 guide the inserted key with the normal key groove width, there is no backlash.

As shown in FIG. 3, a cap 17 made of a hard member is mounted on the front surface of the inner cylinder 14. The cap 17 has a key groove 17 a having substantially the same shape as the key groove 15.
Are formed at the same position. Therefore, only the key groove 17a appears on the front surface of the inner cylinder 14. The thickness W of the cap 17 is longer than a normal thread pitch.

In the pull-out / break prevention lock configured as described above, first, when the screw is screwed in to pull out the cylinder, the pitch of the thread is smaller than the thickness W of the cap 17, so that the thread is formed by the key groove 17a. It collapsed,
I can't screw it in.

Further, even if the cylinder is pulled out by tapping a screw through the key groove 17a and pulling out the screw, the screw thread of the screw bites into the widened portion.
Can not be fitted Te, stick width eating is threaded the thickness
Since the width of the inner cylinder 14 is narrow, there is no possibility that the inner cylinder 14 comes off. On the other hand, conventionally, there was a risk that the cylinder would come off because the thread would bite over the entire length of the inner cylinder. Figure thus
As in the embodiment shown in FIG. 1 and FIG.
At least the pitch width of the screw for pulling out and breaking from the front of the inner cylinder
A longer distance from the depth to the depth direction, and
Expand the keyway on both sides along the longitudinal direction of the inner cylinder
The screw for pulling out and breaking into the keyway of the inner cylinder
To prevent the cylinder from coming off.

Incidentally, the present invention is not limited to the above-described embodiment, and various design changes can be made based on the technical idea of the present invention.

[0019]

As described above in detail, according to the lock for preventing pull-out and destruction according to the present invention, the inner cylinder in which the key groove of the hard member is formed, and the outer cylinder in which the inner cylinder is rotatably supported. When,
A cylinder lock provided with a regulating means for regulating and controlling the rotation of the inner cylinder, wherein a small amount of
At least the pitch width of the screw for pulling out and breaking from the front of the inner cylinder
A longer distance in the depth direction from the depth part, and
The keyway is expanded on both sides along the longitudinal direction of the inner cylinder.
In addition, since the widened portion that does not fit with the screw is provided, the width of the screwed-in thread is small, and there is no possibility that the cylinder will be pulled out.

Since the enlarged portion of the key groove is a portion which is located a predetermined distance from the front of the inner cylinder, even if the screw is to be screwed from the key groove, it is larger than the pitch of the screw thread. Can not get over and screw in, can not pull out the cylinder.

The widened portion of the key groove is formed in a direction corresponding to a key width of the key groove.
Since the middle position in direction, both ends in the width direction becomes to being pressed by normal key groove width, normal lock, in unlocking operation, the inserted key is not be rattling.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a pullout prevention lock according to the present invention.

FIG. 2 is a front view showing the pullout prevention lock.

FIG. 3 is a sectional view of an inner cylinder showing another embodiment of the pullout prevention lock.

FIG. 4 is a front view showing a state where a cap of the inner cylinder is removed.

FIG. 5 is a front view showing a state in which the cap for the pullout prevention lock is attached.

FIG. 6 is a front view showing an example of the conventional pullout break prevention lock.

FIG. 7 is a side view of the pullout break prevention lock.

FIG. 8 is a front view showing another embodiment of the pullout prevention lock.

FIG. 9 is a cross-sectional view showing another embodiment of the pullout prevention lock.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Pullout prevention lock 11 Keyway 11a Central part 11b Back end part 12 Inner cylinder 13 Outer cylinder 14 Inner cylinder 15 Key groove 15a Expanding part 16 Key 16a, 16b Both ends 17 Cap 17a Key groove 18 Key

Claims (2)

(57) [Claims] An inner cylinder formed with a key groove of a hard member ;
An inner cylinder rotatably supported by an outer cylinder, and a cylinder lock provided with a regulating means for regulating and controlling the rotation of the inner cylinder, wherein at least a portion of the inner cylinder at a key groove portion of the inner cylinder is provided.
It is longer than the pitch width of the screw for pulling out and breaking from the front
In the depth direction from the depth of the part and the longitudinal direction of the inner cylinder
Expand the keyway on both sides along the direction
An anti-pull breakable lock characterized by having an expanded portion that does not fit . 2. An enlarged portion in a key width direction of a key groove.
2. The device according to claim 1, wherein the device is at an intermediate position.
Pull-out breaking lock.