JP2502369Y2 - Pin tumbler lock - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a pin tumbler lock, and more particularly to a pin tumbler lock having a large crime prevention effect that makes it difficult to duplicate a duplicate key.

[Prior Art] As is well known, a pin tumbler lock is composed of a lock body and a key for locking and unlocking the lock body.

The pin tumbler lock has a casing having a cutout portion on the outer edge of the key insertion opening, a fixed cylindrical body portion and a rotating portion provided in the casing, and the tip end extends from the rotating portion to reach the inside of the key insertion opening. A pin is formed in the pin hole of each row of the fixed cylindrical portion and the rotating portion, and a key claw receiver is formed on the outer surface of the tip of the guide protrusion.

Also, the key has a cylindrical insertion portion that is inserted into the key insertion opening. A pin pressing cam groove surface that presses the pin and a retaining projection that engages with the notch are formed on the outer peripheral surface of the distal end of the cylindrical insertion portion. A key claw that engages with the key claw receiver is formed on the inner peripheral surface of the cylindrical insertion portion. The key is formed by providing a pin pressing cam groove surface on the key material.

Thus, when unlocking, first, the lock retaining projections of the keys are engaged with the notches of the casing, and the key claws are engaged with the key claw receivers. Insert into the key claw insertion port. At this time, the pin pressing cam groove surface of the key presses the pin, so that the rotating portion becomes rotatable. In this state, the key body is unlocked by rotating the key and rotating the rotating portion.

[Problems to be solved by the invention] By the way, in recent years, because the keying technology has been developed, if the inner diameter of the cylindrical insertion part of the key material matches that of a regular key, the key body There was a problem that the duplicate key could be easily duplicated just by looking at. That is, since a pipe having a cylindrical shape is generally cut and used as the cylindrical insertion portion of the key material, the duplication key can be easily duplicated by cutting the pin pressing cam groove surface on the cut pipe outer peripheral surface. Met. For this reason, the effectiveness of the crime prevention effect was impaired.

Therefore, as shown in FIG. 10 of Japanese Patent Publication No. 49-9677, there is a pin tumbler lock in which a rotary shaft has two auxiliary grooves in addition to a key claw receiver. The key used for this purpose can be easily duplicated with a pipe as in the prior art, because two inward ribs may be provided on the inner peripheral surface of the pipe in addition to the key claw. Further, as shown in Japanese Utility Model Publication No. 56-38123, there is a pin tumbler lock in which pins are dually implanted inside and outside, but the key used for this is to cut the cam groove surface for pin pressing inside and outside the pipe. Therefore, none of them could be expected to have a sufficient crime prevention effect.

Therefore, the present invention has been made in view of the above situation,
It is an object of the present invention to provide a pin tumbler lock having a crime prevention effect by making it difficult to copy.

[Means for Solving the Problems] A lock main body of a pin tumbler lock according to the present invention includes a casing having a cutout portion at an outer edge of a key insertion opening, a fixed cylinder portion provided in the casing, and the fixed body. A rotating portion that is rotatably provided with respect to the tubular portion, a guide protrusion that extends from the rotating portion and has a tip end side inside the key insertion opening, and pin holes in each row of the fixed tubular portion and the rotating portion. Each of the drive pins and the operation pin accommodated in the above, and a key claw receiver whose outer surface of the leading end of the guide projection is notched. Also, the key is provided with a pin pressing cam groove surface and a retaining projection on the outer peripheral end surface of the cylindrical insertion portion which is guided by the guide protrusion and can be inserted into the key insertion opening, and the inner peripheral surface has the above-mentioned structure. It is composed of a key having a key claw that engages with the key claw receiver.

A plurality of first engaging portions that project in a convex shape at different intervals in the circumferential direction and have different axial lengths are formed on the outer peripheral surface of the guide protrusion of the lock main body. The inner peripheral surface of the portion is provided with a large number of second engaging portions which are recessed at intervals in the circumferential direction and which have an axial depth corresponding to the respective first engaging portions. It is characterized by that.

[Operation of the device] When the cylindrical insertion portion of the key is inserted into the key insertion opening of the lock body,
The retaining projection is engaged with the notch, and at this position, the key claw can be engaged with the key claw receiver. Along with this, each of the second engaging portions on the inner peripheral surface of the key engages with each of the first engaging portions on the outer peripheral surface of the guide protrusion of the lock main body, which engages with each of the second engaging portions. The cylindrical insertion part of the key enters the lock body to the position where the directional length and the axial depth come into contact with each other. At that position, each pin is pushed to the unlocking position by the pressing cam surface on the outer peripheral surface of the key, the rotating portion is rotatable, and the key can be unlocked.

[Embodiment] An embodiment of the present invention will be described below with reference to FIGS. 1 to 3.

The lock main body 1 of the pin tumbler lock is composed of a casing 4 having a cutout portion 3 at the outer edge of the key insertion opening 2, a fixed cylindrical body portion 5 and a rotating body 6 provided in the casing 4.

Drive pins 8 having different lengths are housed in the bottomed pin holes 7 of the fixed cylindrical body portion 5 while being biased in a protruding direction by springs 9.

The rotary body 6 is composed of a rotary portion 10 having one end rotatably inserted into the fixed cylindrical body portion 5 and a guide protrusion 11, and the guide protrusion 11 extends from the rotary portion 10. The tip side reaches the inside of the key insertion opening 2 and a key claw receiver 12 is formed.
The operation pins 14 having different lengths are housed in the through-pin holes 13 of the large-diameter portion 10a of the rotating portion 10 respectively. The through pin holes 13 are formed coaxially with the pin holes 7 ... Of the fixed cylindrical body portion 5.

As a result, as shown in FIG.
.. penetrates into the through pin holes 13 and blocks the rotation of the rotating portion 10. The rear ends of the operation pins 14 are in contact with the edge portion 2a of the key insertion opening 2. A latch (not shown) that engages with a receiving member such as a door is attached to one end 6a of the rotating body 6 so that it can be locked and unlocked.

On the other hand, the key 15 used for the upper main body 1 has a cylindrical insertion portion 16 into which the guide protrusion 11 is inserted, and the cylindrical insertion portion 16 is inserted into the key insertion opening 2. It is a thing. On the outer peripheral end surface of the cylindrical insertion portion 16, a pin pressing cam groove surface 17 ...
And a protrusion 18 for retaining, and a key claw 19 on the inner peripheral surface.
Is provided. The pin pressing cam groove surface 17 presses the rear end surface of the operation pin 14, and the retaining projections.
Reference numeral 18 is to be engaged with the notch 3. Further, the key claw 19 is engaged with the key claw receiver 12.

The feature of the above configuration is that a large number of first engaging portions 20 are formed on the outer peripheral surface of the guide protrusion 11, and the first engaging portion is formed on the inner peripheral surface of the cylindrical insertion portion 16 of the key 15. Multiple second engaging 20
The point is that the engaging portion 21 is provided.

More specifically, for example, as shown in FIG. 2, six first engaging portions 20 can be formed in a convex shape, and the axial lengths L thereof are preferably different from each other. The first engaging portion 20 is
As shown in FIGS. 1 and 3, the guide projections 11 can be projected on the outer peripheral surface in a substantially star shape at intervals in the circumferential direction.

Further, the six second engaging portions 21 can be formed in a concave shape corresponding to the first engaging portions 20, and the contour shape and the axial depth S thereof are the contour shapes of the respective first engaging portions 20. And axial length L
It corresponds to. This second engaging portion 21 is shown in FIGS.
As shown in the drawing, the inner surface of the cylindrical insertion portion 16 is recessed at intervals in the circumferential direction.

 Next, the operation will be described.

The cylindrical insertion portion 16 of the key 15 is inserted into the key insertion opening 2 of the lock body 1. At this time, the retaining projection 18 engages with the notch 3, the key claw 19 engages with the key claw receiver 12, and the second engaging portions 21 ... Each first with
Engages with the engaging portions 20.

At this time, since the pin pressing cam groove surface 17 of the key 15 presses the rear end of the operation pin 14, the drive pin 8 is pressed by the operation pin 14. As a result, the drive pin 8 retracts from the state shown in FIG. 1 into the pin hole 7. Therefore, the rotating portion 10 becomes rotatable, and when the key 15 is rotated, the rotating portion rotates 10 times and is unlocked.

By the way, the formation position, the contour shape, and the depth S of the second engaging portions 21 ... Of the key 15 respectively correspond to the first engaging portion 20.
The key 15 cannot be inserted into the key insertion slot 2 unless the formation position, contour shape, and length L match with.

Thus, in the case of the prior art, the duplication key can be easily duplicated by the pipe by specifying the formation position and the depth of the pin pressing cam groove surfaces 17 ... In contrast to the second embodiment in the present embodiment. Joint part 21
The duplicate key cannot be duplicated unless the formation position, contour shape, and depth are specified.

In the above embodiment, the position of each engaging portion, the contour shape,
The depth, the number, etc. can be changed in various ways.

[Effects of the Invention] As described above, according to the present invention, a large number of first protrusions having different axial lengths are formed on the outer peripheral surface of the guide protrusion of the lock body so as to protrude in a circumferential direction at intervals. The engaging portion is formed, and the inner peripheral surface of the cylindrical insertion portion of the key is recessed at intervals in the circumferential direction at which it engages corresponding to each of the first engaging portions, thereby forming an axial depth. Since a large number of second engaging portions having a height are provided,
It was difficult to duplicate the duplicate key just by looking at the key body. In particular, since it is necessary to specify the contour shapes of the second engaging portions so as to match a large number of first engaging portions and perform three-dimensional curved surface processing, it is possible to duplicate using a conventional pipe. lost. Moreover, since the depths in the axial direction are also made to coincide with each other, it is possible to make duplication extremely difficult and enhance the effectiveness of the crime prevention effect.

[Brief description of drawings]

1 to 3 relate to an embodiment of the present invention, FIG. 1 is an overall perspective view with a part cut away, and FIG. 2 is a partial sectional view showing the relationship between the first and second engaging portions, FIG. 3 is a cross-sectional view showing a state where a key is inserted in the lock body. 1 ... Lock body, 2 ... Key insertion port, 3 ... Notch, 4 ...
Casing, 5 ... Fixed cylinder part, 8 ... Drive pin,
10 …… Rotating part, 11 …… Guide protrusion, 14 …… Operating pin, 15…
… Key, 16 …… cylindrical insertion part, 17 …… Pin pressing cam groove surface,
18: retaining projection, 19: key claw, 20: first engaging portion, 21: second engaging portion, L ... length, S ... depth

Claims (1)

(57) [Scope of utility model registration request] 1. A casing having a cutout portion at an outer edge of a key insertion opening, a fixed cylindrical body portion provided in the casing, a rotating portion rotatably provided with respect to the fixed cylindrical body portion, A guide protrusion extending from the rotating portion and reaching the inside of the key insertion opening at the tip side, drive pins and operation pins housed in the pin holes of each row of the fixed cylinder portion and the rotating portion, and an outer surface of the guide protrusion tip. A lock main body is composed of a notched key claw receiver, and a pin pressing cam groove surface and a stopper are provided on an outer peripheral end surface of a cylindrical insertion portion which is guided by the guide protrusion and can be inserted into the key insertion opening. In a pin tumbler lock that is provided with a projection for use and a key provided with a key claw that engages with the key claw receiver on the inner peripheral surface, a circumferential interval is provided on the outer peripheral surface of the guide projection. Forming a large number of first engaging portions protruding in a convex shape and having different axial lengths And a plurality of second engaging members having an axial depth that are recessed at circumferentially spaced intervals that engage with the respective first engaging portions on the inner peripheral surface of the cylindrical insertion portion. Pin tumbler lock characterized by having a joint.