JPH0448296Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a pin tumbler lock that is locked in accordance with the protrusion of the pin and unlocked in accordance with the alignment of the pins on the butt plane, and in particular, This invention relates to a pin tumbler lock of a lock conversion type, which can make the dedicated key unusable and make another key usable when the dedicated key is lost.

[Prior Art] As is well known, a pin tumbler lock can be locked and unlocked using one type of special lock. The pin tumbler lock body has a notch on the outer edge of the key insertion opening of the casing, and pins of different lengths are accommodated in the pin holes of each row of the fixed cylindrical body and the rotating body inside the casing. There are some that consist of The special key for the cutting pin tumbler lock has pin pressing cam groove surfaces of different depths formed on the abutting plane of the fixed cylindrical body and the rotary body to enable pressing according to the dimensions of each pin mentioned above. It is something.

[Problems to be Solved by the Invention] However, in the prior art, if the special key is lost, the pin tumbler lock must be replaced with a new one. Particularly, if the key is stolen, the pin tumbler must be replaced as soon as possible because it loses its function as a pin tumbler lock from the standpoint of theft prevention. Therefore, there is a problem that not only the pin tumbler lock is wasted, but also the trouble of replacing the pin tumbler lock is required.

Therefore, this invention was made in view of the above-mentioned circumstances, and its purpose is to make the lost special key unusable and to make it possible to use another key, eliminating the need to replace the pin tumbler lock. Our goal is to provide convertible tumbler locks.

[Means for Solving the Problems] The feature of the pin tumbler lock according to the present invention for achieving the above object is that the at least one pin is shortened and a ball is interposed on the rotating surface side in the pin hole. and a first conversion key having a cam groove surface for pressing an operation pin similar to a cam groove surface for pressing an operation pin of the first key without having the protrusion for preventing coming off, and having the protrusion for preventing coming off. a second conversion key in which at least one operating pin pressing cam groove surface is formed to be different by one ball; and an operating pin pressing cam groove surface of the second conversion key having the retaining protrusion. and a second key having a similar cam groove surface for pressing the operation pin.

[Operation of the invention] When the lock is locked, the drive pin of the fixed cylindrical body engages with the through pin hole of the rotating body, thereby restraining the rotation of the rotating body. When the first key is inserted into the key insertion slot, the first operation pin pressing cam groove surface presses the operation pin and the drive pin, so the drive pin is retracted into the through pin hole. Thereby, the rotating body becomes rotatable, and when the rotating body rotates, the lock is unlocked.

Next, insert the first conversion lock into the key insertion slot,
After rotating the rotating body through the pin holes by an arbitrary number of rows, the first conversion key is pulled out. Since the first conversion key does not have a locking protrusion, it can be pulled out at any rotational position.

Next, insert the second change key again. Since the second variable key does not have a retaining protrusion, it can be inserted from a state that matches the arbitrary rotational position.
The cam groove surface for pressing one operation pin of the second conversion key is
Because of the one ball difference, the ball moves from one pin hole to the other. In this state, by rotating the second conversion lock, the rotating body is rotated to the initial position, and then the second conversion key is pulled out.

The pins in the other row of pin holes into which the balls have entered protrude into the key insertion slot by one ball. As a result, only the second key becomes usable, and the first key becomes unusable. That is, since the cam groove surface for pressing one operating pin of the second key is different by one ball, it can be inserted into the key insertion slot. The first key that is not set cannot be rotated.

[Embodiment of the invention] An embodiment of the invention will be described below with reference to FIGS. 1 to 9.

The key body 1 consists of a fixed cylindrical part 3 fixed inside the casing 2, and a rotating body 4 whose one end is rotatably inserted into the fixed cylindrical part 3.
A rotating surface 5 is formed between the fixed cylindrical body portion 3 and the fixed cylindrical body portion 3 .
The outer edge of the key insertion slot 10 on the front end side of the casing 1 has a notch 11, and the flange 12 on the rear end side is attached to a door or the like. Drive pins 19a to 19e of different lengths are accommodated in each of the bottomed pin holes 14a to 14e of the fixed cylindrical body 3, respectively, while being biased toward the rotating surface by springs 24. .

Further, operating pins 35a having different lengths are provided in each of the through pin holes 30a to 30e of the large diameter portion 40 of the rotating body 4.
.about.35e are accommodated in the pin holes 14a to 14a, respectively.
It is formed coaxially with 4e. As a result, each of the drive pins 14a to 14e enters into the through pin holes 30a to 30e and restricts rotation of the rotating body 4. The rear ends of the operating pins 35a to 35e are in contact with the edge 10a of the key insertion slot 10. One end A of the rotating body 4 is provided with a latch (not shown) that locks onto a receiver such as a door, so that it can be locked and unlocked.

In the figure, 41 is a shaft portion inserted into the hole 3A of the fixed cylindrical body portion 3, 42 is a guide portion on the tip side, and 43 is a guide portion 42.
This is the keyway formed in the

The dedicated first key 6 used in the key body 1 has an operation pin pressing cam groove surface 4 formed on the front end surface 52a.
4a to 44e and the notch 11 of the casing 1
a retaining protrusion 49 that engages with the rotating body 4;
A key pawl 50 that engages in the key groove 43 is formed. Here, each operation pin pressing cam groove surface 44a~
44e indicates each of the operation pins 3 as shown in FIG.
5a to 35e, the depth of each cam groove surface is adjusted to the depth of each of the operating pins 35a to 35e.
It is formed at a position corresponding to the length of 35e. The first key 6 has an operating section 53 in an operating section 52 having a hole 51.
is provided.

The feature of the key body 1 is that at least one drive pin 19b is connected to other drive pins 19a, 19.
It is formed to be shorter than c to 19e, and has a ball 29 interposed therebetween.

Another feature of the second key 7, similar to the first key 6, is that it has operation pin pressing cam groove surfaces 54a to 54e,
It has a retaining protrusion 59 and a key pawl 60. Here, the depth of the operation pin pressing cam groove surface 54b is formed to be one ball 29 deeper than the depth of the operation pin pressing groove 44b of the first key 6.

Further, the first conversion key 8 has operation pin pressing cam groove surfaces 61a to 6 formed at the same position and depth as the operation pin pressing cam groove surfaces 44a to 44e of the first key 6.
1e and a key pawl 66, but the first key 6
The retaining protrusion 49 is not formed.

Further, the second conversion key 9 has an operation pin pressing cam groove surface 67a formed at the same position and the same depth as the operation pin pressing cam groove surfaces 54a to 54f of the second key 7.
67f and a key pawl 72, but the protrusion 59 for preventing the second key 7 from coming off is not formed.

Next, a case where the lock body 5 is unlocked using the first key 6 will be explained.

As shown in FIG. 3, when the first key 6 is inserted into the key insertion slot 10, each operation pin 35 is inserted as shown in FIG.
Since the tips of a to 35e coincide with the rotating surface 5, the rotating body 4 can rotate and unlock.

Next, in this case where the first key 6 is lost, it is necessary to convert the structure of the lock body 1 using the first and second conversion keys 8 and 9 so that only the second key 7 can be used.

First, when the first conversion key 8 is inserted, as shown in FIG. 6, the operation pin pressing cam groove surfaces 61a to 6
1e is the same as the amount of retraction of each of the operating pin pressing cam groove surfaces 44a to 44e of the first key 6, so the tips of each drive pin 19a to 19e coincide with the rotating surface 5. Thereafter, the first conversion key 8 is operated to rotate the rotating body 4, and the pin axis position is changed as shown in FIG.

The first conversion key 8 is removed from this state, and the second conversion key 9 is inserted in its place. Unlike the first and second keys 6 and 7, the first and second variable keys 8 and 9 are not provided with retaining protrusions 49 and 59, so they can be pulled out and inserted from this state. . The operation pin pressing cam groove surface 67b of the second conversion key 9 is set back by the diameter of the ball 29 from the operation pin pressing cam groove surfaces 44b, 54b of the first key 6 and first conversion key 8. , the ball 2
9 moves into the through pin hole 30 as shown in the eighth figure.

Next, by rotating the second conversion key 9 in the opposite direction to the above, the state shown in FIG. 9 is achieved, and then when the second conversion key 9 is pulled out, only the second key 7 becomes usable.

That is, when the second key 7 is inserted, the rotating body 4 becomes rotatable and unlocked, as shown in FIG. Note that even if you try to insert the first key 6, the first key 6
is not inserted because it is obstructed by ball 29,
The first key 6 becomes disabled.

Conversely, the second key 7 can be replaced with the first key 6. This is because only the first key 6 can be made usable by replacing the second conversion key 9 with the first conversion key 8 and then performing the same procedure as above.

In the above embodiment, the drive pin 19b is illustrated and described as short, but it is also possible to use a short operation pin. In this case, the operation pin pressing cam groove surface may be configured according to the short dimension.

[Effect of the invention] As explained above, according to the invention, if the first key is lost or stolen, the lock structure is changed to immediately make the first key unusable and prevent the theft. Not only can this be prevented, but also the use of a different second key can be made possible. For this reason, there is no need to replace the pin tumbler lock as in the past,
It is highly practical as it eliminates the trouble of replacing the pin tumbler lock.

[Brief explanation of the drawing]

Figures 1 to 9 relate to an embodiment of a convertible pin tumbler lock according to the present invention, Figure 1 is an overall perspective view with a part of the lock body cut away, and Figure 2 is a drive of the lock body. A developed view schematically showing the arrangement of pins and operation pins, Fig. 3 is a sectional view of the first key inserted into the lock body, Figs. 4 A to C are perspective views of the tip side of each key,
FIG. 5 to FIG. 9 are explanatory diagrams for explaining the operation. DESCRIPTION OF SYMBOLS 1... Lock body, 2... Casing, 3... Fixed cylindrical body part, 4... Rotating body, 5... Rotating surface, 6... First key, 7... Second key, 8... First Conversion key, 9...
Second conversion key, 19a to 19e...drive pin,
29...Ball, 30a-30e...Through pin hole, 35a-35e...Operation pin.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A casing that has a notch on the outer edge of the key insertion slot, and a drive pin that is biased forward from the bottom of multiple rows of closed pin holes provided inside the casing and accommodates each drive pin. A rotating surface is formed between the fixed cylindrical part and the surface of the fixed cylindrical part, one end of which is rotatably inserted into the fixed cylindrical part. The lock body is composed of the pin and a rotating body housed coaxially,
A pin tumbler lock which is combined with a first key having a cam groove surface for pressing an operation pin and a projection for preventing removal on the outer circumferential end surface which can be inserted from the key insertion opening of the lock body, at least as described above. A ball interposed on the rotating surface side in the pin hole as a short length of one pin, and an operation pin pressing similar to the cam groove surface for pressing the operation pin of the first key without the retaining protrusion. a first conversion key having a cam groove surface for pressing the operating pin; a second conversion key having no retaining protrusion and having at least one operating pin pressing cam groove surface different from the ball by one ball; A key conversion type pin tumbler lock comprising a second key having a projection for preventing slippage and a cam groove surface for pressing the operation pin similar to the cam groove surface for pressing the operation pin of the second conversion key. . (2) In the device described in claim 1 of the utility model registration claim, the short pin is a drive pin,
A key conversion type pin tumbler lock, characterized in that a second conversion key and a cam groove surface for pressing an operation pin of at least one of the second keys are formed as deep as one ball.