JPH0220790B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cylinder in which a key guide and a plug are separately connected in front of a key.

The key guide and plug of a conventional pin cylinder are integrated, with a key guide part 2a and a plug part 3a formed by cutting a round bar, and a key hole 6a formed by broaching, as shown in Fig. 1. be.

For this reason, if a duplicate key was lost, it was necessary to replace the entire cylinder in order to make the previous duplicate key unusable. However, if the cylinder is equipped with a master key, the replacement cylinder must also be unlockable with the same master key, which is difficult to obtain.

In the cylinder of the present invention, by separating the key guide and plug and connecting them with a joint, the key guide part can be replaced, and the key guide part can be replaced with a key guide part having a different keyhole cross-sectional shape. This allows the old duplicate key to be invalidated and replaced with a new duplicate key.

An object of the present invention is to provide this type of "variable cylinder in a narrow sense" as described above. That is, the present invention, as detailed below, manufactures the key guide 2 and the plug 3 separately,
The key guide 2 and the plug 3 are integrally connected by a joint S, so that only the key guide 2 can be replaced when a conventional duplicate key is invalidated and replaced with a new duplicate key. In this way, the present invention aims to provide a "variable cylinder in a narrow sense" that is inexpensive and has a simplified manufacturing process.

Embodiments of the present invention illustrated in the drawings will be described below. First, the first embodiment of the present invention shown in FIGS. 2 to 5 will be described.

(Description of the first embodiment) In the drawings, 1 is an outer cylinder, 2 is a key guide, and 3 is a key guide.
4 is a plug, and 4 is a widened convex portion on the bottom surface forming a joint S of the key guide 2. 5 is the widened recess on the bottom of the plug 3, 6 is the keyhole of the key guide 2,
7 is the keyhole of the plug 3. As shown in FIGS. 4 and 5, conceivable embodiments include a case where both side surfaces of the convex portion 4 and the concave portion 5 have stepped portions, and a case where sloped surfaces are formed.

In the first embodiment, the convex portion 4 and the concave portion 5 fit into each other to form a joint S, thereby joining the outer cylinder 1 and the plug 3. In this way, the convex portion 4 does not come out of the concave portion 5, and the key guide 2 and the plug 3 are integrally connected within the outer cylinder 1.

In the first embodiment, by disassembling the outer cylinder 1 and the plug 3 and then removing the protrusion 4 from the recess 5, the key guide 2 having a different shape of the keyhole 6 can be replaced.

(Description of Second Embodiment) Next, the second embodiment shown in FIGS. 6 to 12 will be described.

In the drawing, 11 is an outer cylinder, 12 is a key guide,
13 is a plug, the front part of which is a large diameter part. This large diameter portion is provided to provide sufficient space for the ball through hole 17 of the coupling ball 14. 14
15 is the coupling ball, 15 is the convex part of the key guide 12,
16 is a ball recess that receives the coupling ball 14 of the key guide protrusion 15; 17 is a ball through hole that receives the ball 14 of the plug 13; 18 is a key for replacing the key guide; 19 is a keyhole of the key guide 12;
20 is a ball recess for receiving the ball 14 of the outer cylinder 11, and 21 is a notch on the key guide replacement key 18 that matches the notch on the duplicate key 22. 23 is a keyhole of the plug 13. (Refer to Figures 10 and 11) In the second embodiment, as the joint S in the first embodiment, the key guide 12 is connected to the coupling ball 14 as described above.
This is the one that is combined with the plug 13.

The operation of the second embodiment will be explained below.

When the pin cylinder is in use, as shown in FIG. combined.

Next, the operation for replacing the key guide 12 is performed as follows.

First, insert the key guide replacement key 18 into the keyholes 19 and 23.

The key guide replacement key 18 has the same notch 21 as the duplicate key 22, as shown in FIG. 11, and does not have the handle portion 25 and shoulder 24 of the duplicate key 22. Further, its cross-sectional shape may match that of the duplicate key 22, or may be common to the shapes of the keyholes 19a, 19b, and 19c of different key guides 12 as shown in FIG. However, if the notches of the duplicate key 22 and the key guide replacement key 18 match, the key guide replacement key 18 must be replaced each time the key guide 12 is replaced for reasons described later, which is not practical.

When the key guide replacement key 18 is rotated from the position shown in FIG. 8 as shown in FIG.
It comes into contact with 0.

When the key guide 12 is pulled out by hand in the state shown in FIG. The key guide 12 can be pulled out by hand. When the key guide 12 is pulled out in this manner, the key guide 12 can be pulled out along with the key guide replacement key 18 as shown in FIG.

At this time, the key guide replacement key 18 is notched 2
1 is engaged with a tumbler bottle (not shown) in the plug 13, so it does not move and only the key guide 12 can be pulled out. Even if an attempt is made to pull out the key guide 12 using the duplicate key 22, the key guide 12 will collide with the shoulder 24 of the duplicate key 22 and cannot be pulled out. [At this time, the duplicate key 22 also cannot move because its notch is engaged with the tumbler pin. After removing the key guide 12, leave the key guide replacement key 18 in the state shown in FIG. 9, and insert another key guide 12 using the key guide replacement key 18. At this time, ball 1
When the key guide 2 is pulled out, the balls 4 and 14 fall out of the ball recess 20, but when inserting another key guide 12 again, the balls 14 and 1 must be inserted in advance.
4 into the ball recess 20 and then quickly insert another key guide 12.

Then, the protrusion 15 of the key guide 12 is connected to the plug 1.
When the key guide replacement key 18 is fitted into the recess 3, the key guide replacement key 18 may be reversely rotated from the state shown in FIG. 9 to the state shown in FIG. At this time, the ball 14 is connected to the ball through hole 17 and the ball recess 16 of the key guide 12.
The key guide 12 and the plug 13 are then connected to each other again.

As described above, in the second embodiment, the key guide 12 can be replaced without disassembling the outer cylinder 11 and the plug 13.

As shown in FIG. 13, in a "variable cylinder in a narrow sense," the shapes of the keyholes 7 and 23 of the plugs 3 and 13 are simpler than the shapes of the keyholes 4 and 19 of the key guides 2 and 12. is common. With this configuration, it becomes possible to manufacture a variable cylinder at low cost.

(Operations and Effects of the Present Invention) Since the present invention has the above-described configuration, its operation and effects can be summarized as follows.

Compared to conventional broaching of round rods of the same diameter, the round rods of the same diameter that form the plugs 3 and 13 and the key guide part 12 can be separated to form a "variable cylinder in a narrow sense." In addition to reducing material costs, the manufacturing process is also simplified.

Only the key guides 2 and 12 are made of forged wood, and different key guides 2 and 1 are attached to one plug 3 and 13.
Since the two can be combined, it is possible to provide a low-priced lock because the key difference can be removed only by changing the cross-sectional shape of the key as a "variable cylinder in a narrow sense."

By using a hard metal material only for the key guide part, it exhibits great resistance against breakage of the drill.

When the key guide 12 and the plug 13 are connected by the connecting ball 14 as in the second embodiment, the key guide 12 can be freely replaced using the key guide replacement key 18 without disassembling the lock structure. Therefore, the existing duplicate key can be invalidated and replaced with a new duplicate key at any time.

[Brief explanation of drawings]

Figure 1: Perspective view of a conventional pin cylinder. Second
Figure: An exploded perspective view of the first embodiment of the present invention. Figure 3: Figure 2 - sectional view. FIG. 4: An exemplary sectional view of the joint S. FIG. 5: An exemplary sectional view of the joint S. FIG. 6: An exploded perspective view of the second embodiment of the present invention. FIG. 7: Horizontal sectional view of the second embodiment. Figure 8: Figure 7 - cross-sectional view,
Indicates the cylinder is in use. FIG. 9: FIG. 7 - sectional view showing a state in which the key guide 12 can be removed. FIG. 10: A perspective view when the key guide 12 is pulled out using the key guide replacement key 18. FIG. 11: A perspective view of the key guide replacement key 18. Figure 12 a, b, c: Key guides 2, 12
FIG. 3 is an explanatory diagram of the shape relationship between the keyholes 19a, 19b, 19c and the key guide replacement key 18. Figure 13:
Key holes 4, 19 of key guides 2, 12 and plug 3,
13 is an explanatory diagram of the shape of the keyholes 7 and 23. Figures 2 to 5, 1... Outer cylinder, 2... Key guide, 3... Plug, 4... Protrusion, 5... Recess, 6
... Keyhole of key guide 2, 7 ... Keyhole of plug 3, Figures 6 to 9, 11 ... Outer cylinder, 12 ... Key guide, 13 ... Plug, 14 ... Connection ball,
15...Protrusion of key guide 12, 16...Protrusion 1
No. 5 recess for ball, 17...Ball through hole, 18
...Key guide replacement key, 19...Keyhole of key guide 12, 20...Ball recess of outer cylinder 11, 2
1...Key guide replacement key 18 notch (11th
), 22... Duplicate key (Figure 10), 23... Keyhole of plug 13, 24... Shoulder (Figure 10),
25...handle portion (Fig. 10).

Claims (1)

[Claims] 1. A lock characterized in that a plug 3 and a key guide 2, which are manufactured separately, are joined together by a joint S, so that the key guide 2 can be replaced with respect to the plug 3. A cylinder that combines a key guide and a plug as separate parts. 2. The cylinder according to claim 1, which uses a joint S that is fitted into the convex part 4 of the key guide 2 and the concave part 5 of the plug 3 so as not to slip out. 3 Outer cylinder 11, plug 13, key guide 12 having convex portion 15, plug 13 and key guide 1
2 and a coupling ball 14 for coupling the key guide 12 with the convex part 15 of the key guide 12.
6, ●The plug 13 has a ball through hole 17 for receiving the ball 14; ●The outer cylinder 11 has a ball recess 20; ●When the key guide 12 and the plug 13 are operating as a lock, The coupling ball 14 is connected to the key guide 12
It is located astride the ball recess 16 of the convex part 15 and the ball through hole 17 of the plug 3, and connects the key guide 12 and the plug 13 together. When replacing the key guide 12, The key guide 12 is rotated together with the plug 13, the ball through hole 17 is brought into contact with the ball recess 20 of the outer cylinder 11, the key guide 12 is pulled out, and the connecting ball 14 is connected to the ball through hole 17 and the ball of the outer cylinder 11. A cylinder in which a key guide and a plug are separately combined in a lock, characterized in that the cylinder is configured to be positioned astride a recessed part 20.