JPH0245396Y2 - - Google Patents

Description

[Detailed explanation of the idea] "Industrial application field" The present invention relates to an axial tumbler lock.

"Prior Art" Currently, there are many types of locks in general use, one of which is known as an axial pin tumbler lock. This axial pin tumbler lock is relatively complex in design, and the key numbers for opening and closing the lock can be combined and varied in many ways.
Therefore, it can be attached to items that need to be locked to prevent theft, such as motorcycles, trunks, doors, and safes.

A conventional axial pin tumbler lock is shown in FIGS. 6 and 7. A conventional axial pin tumbler lock is generally composed of a key j, a case i, an upper ball base a, a lock shaft b, a lower ball base e, and a lock lever S, as shown in FIG.

The upper ball base a is disc-shaped, and the lock shaft b passes through the upper ball base a.
As a result, the upper ball base a is fixed near one end of the lock shaft b. Near the periphery of the outer end surface of the upper ball base a, a plurality of pinholes d pass through the inner end surface along the axis, and lock pins c of different lengths are fitted into each of these pinholes d. .

The lock shaft b is a cylindrical rod, and at one end protruding from the outer end surface of the upper ball base a, a recess n is formed in the outer peripheral surface of the lock shaft b along the axis of the lock shaft b. There is. On the other hand, a notch is formed from the vicinity of the longitudinal center of the lock shaft b to the other end on the opposite side to the end and parallel to both sides of the outer peripheral surface along the axis,
The cross section of this notch is approximately O-shaped. Furthermore, the free end of this notch (the end of the lock shaft b) is provided with a thread (threaded).

The lower ball base e has a hollow cylindrical shape. A lock shaft b can be provided coaxially through the opening of the lower ball base e. A plurality of pinholes f are formed along the axis at one end of the lower ball base e, penetrating to the vicinity of the other end, and lock pins h are fitted into these pinholes f together with a spring g. The upper lock pin c and the lower lock pin h are provided coaxially so that their corresponding end surfaces can come into contact with each other.
Further, a curved plate-shaped projection piece q is provided along the axis at the other end edge of the lower ball base e. A pinhole z communicating with the opening is formed on the outer peripheral surface near the protrusion q. Furthermore, a disc-shaped break block k having approximately the same radius as this end face is arranged on the end face of the lower ball base e on the protruding piece q side.

The break block k has an approximately O-shaped opening in the center and penetrating openings at both ends, into which the notch of the lock shaft b is fitted. Furthermore, a notch is partially formed on the outer circumferential surface of this block k along the circumference thereof. Thereby, when one end surface of the block k and one end surface of the lower ball base e are overlapped, the protruding piece q can be fitted loosely so as not to collide with the end surface of the break block k. Furthermore, due to the engagement between the protrusion q and the notch, the rotation angle (by the notch range pp) of the break block k fixed to the lock shaft b is limited.

The lock lever s is involved in locking and unlocking the axial tumbler lock, and is an elliptical member having a roughly O-shaped opening at a position offset from the axis. A portion of the lock shaft b protruding from the break block k is fitted into this opening. The fitted ends of the lock shaft b are tightened by a nut t, thereby preventing the break block k and the lock lever S from floating on the lock shaft b (preventing them from rattling).

The case i has a hollow cylindrical shape, and has a keyhole x in one end surface, and a pinhole penetrating the inner opening in the outer peripheral surface.

The key j consists of a grip part j-1 and a key part, and this key part has a hollow cylindrical shape as shown in FIG. 6A. A plurality of grooves (push pin ways) m along the axis are formed on the outer circumferential surface of the key part with different lengths of the grooves along the axis. Further, a convex portion v protruding from the outer circumferential surface toward the opening is provided.

Figure 7 shows upper ball base a and lower ball base e.
FIG. 3 is a cross-sectional view showing a state in which the case i is provided.

The upper ball base a and the lower ball base e are integrated together with the lock shaft b. That is, an upper ball base a and a lower ball base e are superposed coaxially with each other so that their respective pinholes d and f communicate with each other, and a lock shaft b is provided with the upper ball base a fixed to one end thereof. passes through the lower ball base e. The other end of the lock shaft b is fitted into the break block k.

One end of the upper ball base a inserted into the case i (the surface from which the end of the lock shaft b having the recess n protrudes) is arranged on the keyhole x side. The lower ball base e is fixed to the case i by a wedge-shaped pin r. Lower lock pin h
is pressed toward the upper ball base a by a spring g, so that one end protrudes from the upper ball base e and is partially inserted into the pinhole d of the upper ball base a. Also, the upper lock pin c
is pressed by the protruding part of the lower lock pin f and the key hole x
Projects outward.

Because of this structure, the upper ball base a and the lock shaft b cannot rotate within the case i. Because the lower ball base e
This is because it is fixed to the case i by the wedge-shaped pin r.

When the lock shaft b cannot rotate, the lock lever s also cannot rotate. As a result, the lock lever S can be attached to a recess (not shown) provided in the frame, etc.
When engaged, the axial tumbler lock is in the locked state.

Next, a method of releasing the conventional axial pin tumbler lock constructed as described above will be explained with reference to FIG.

First, insert the key part of key i into the keyhole x of case i. At this time, the convex portion v and the concave portion n are made to engage with each other. As a result, each upper lock pin c is inserted into the push pin way m. One end surface of this lock pin c is pressed by the bottom surface of the push pin way m. Furthermore, the pressed lock pin c
pushes and moves the corresponding lower lock pin h.

When the tip of the key j (the tip of the key part) collides with one end surface of the upper ball base a, all the lock pins c are pushed into the pinholes d. At the same time, all the lock pins h of the lower ball base e are pushed into the pinholes f.

In this way, the lock becomes unlocked.
That is, when key j is rotated at this point, upper ball base a fixed to lock axis b rotates in conjunction with the rotation of lock axis b (at this time, lower ball base e does not rotate). ). Further, the lock lever s rotates in conjunction with the rotation of the lock shaft b.

``Problems to be Solved by the Invention'' However, such an axial pin tumbler lock can be easily unlocked by a device known as a pick tool, which is owned by those skilled in the art, even without a specific key. As a result, anyone who owns a pick tool can easily unlock the lock, reducing the effectiveness of preventing theft.

An example of the pick tool is shown in FIG. This pick tool consists of upper and lower lock pins, the same number of steel pins, and a steel pin control ring. This steel pin control ring also controls the movement of the steel pin by locking the bolt and rubber packing.

FIGS. 10, 11 and 12 show how to use the retractable pick tool.

First, a steel pin r is inserted into each upper pinhole d of the manual method. And each upper lock pin c
Push and move the lower lock pin h into the pinhole f of the lower ball base e (see Figure 10).
Then rotate the pick tool left and right.

Since the spring g presses the lower lock pin h outward, when the lower lock pin h is coaxial with the corresponding upper lock pin c, the upper lock pin c is pressed by the lower lock pin h. Then, since the upper lock pin c pushes the corresponding steel pin r, the steel pin r retreats outward. However, since the retraction of the steel pin r is controlled by the steel pin control ring, the retraction speed of the steel pin r is extremely slow. Therefore, as shown in Fig. 12, when the tip of the lower lock pin h and the end surface of the lower ball base e are aligned by the retreat of one steel pin r (the upper lock pin c is pulled out from the lower ball base r) When the pick tool is removed at a time of
The protrusion can be suppressed by the end face.

In addition, since there is a possibility that there may be at least a small error in the size of each lock pin c, h and each pin hole d, f during production, the diameter of each pin hole d, f is generally smaller than the outer diameter of each lock pin c, h. is also set larger to account for errors.

For example, if the diameter of each pinhole d, f is 2.1 mm, the outer diameter of each lock pin c, h will be 2 mm, resulting in a gap of 0.1 mm. Then,
As shown in FIGS. 15A and 15B, when rotating left and right, the tip of the lower lock pin h is continuously pressed against the edge of the upper pinhole d, and the movement of the lower lock pin h is suppressed. However, as shown in FIG. 12, when the lower lock pin h has not yet reached the exit of the lower pin hole f, it continues to rise. In this way, when the tips of all the lower lock pins h are aligned at the same height as the end surface of the lower ball base e (see Fig. 11), the upper ball base a is rotated via the steel pin r to lock the axial tumbler lock. unlock.

FIG. 5 shows a pick tool of a different type (error type) from the above pick tool. This pick tool also has the same number of steel pins r' as lock pins.

To use this pick tool, first press the upper lock pin c with a steel pin r', and at the same time rotate this steel pin r' left and right. Next, when the upper lock pin c comes into contact with the outlet edge of the lower pin hole f, the inserted length of the steel pin r' is measured. Then, the same operation is performed for each lock pin c and f. This makes it possible to unlock the axial tumbler lock again using a pick tool with the steel pin r' reassembled based on the recorded data.

In view of the above circumstances, the present inventor provided a protrusion along the circumferential surface near the end along the axial direction of the lock pin (lower lock pin) of the lower ball base, and created a pin hole (lower pin hole) in the lower ball base. The above problem is solved by providing two parts with different diameters, a large diameter part and a small diameter part.

"Function" Lower ball base lock pin (lower lock pin)
A convex part is provided along the circumferential surface near the end along the axial direction, and the pinhole of the lower ball base (lower pinhole) is formed with a large diameter part and a small diameter part, and the diameter of this opening is The diameter is larger than the diameter of the pinhole on the upper ball base (upper pinhole),
In addition, the depth of the large diameter portion is smaller than the length along the axis from the tip of the lower lock pin to the inner wall of the convex portion, and the large diameter portion of the lower pinhole is formed between the convex portion of the lower lock pin and the upper lock pin. The small diameter part of the lower pinhole is formed so that the convex part of the lower lock pin and the upper lock pin can be inserted and slid into sliding contact, so the upper pinhole and the lower pinhole are coaxial. When communicating with
Both the upper lock pin and the lower lock pin can move between the upper pin hole and the lower pin hole, and when the upper pin hole and the lower pin hole communicate with each other with their axes shifted, the upper lock pin moves into the small diameter part of the lower pin hole. Otherwise, the convex portion of the lower lock pin will not be inserted into the small diameter portion of the lower pin hole.

Hereinafter, the present invention will be explained in detail based on examples.

Embodiment FIG. 1 shows an axial pin tumbler lock based on the present invention. The general structure is the same as that of the conventional one, and generally consists of a key, a case, an upper ball base, a lock shaft, a lower ball base, and a lock lever.

The upper ball base 2 is disk-shaped and is fixed near one end of the lock shaft. A plurality of pinholes 21 pass through the periphery of the outer end surface of the upper ball base 2 toward the inner end surface along the axis, and each of these pinholes 21 has a lock pin 3 of a different length. It's embedded.

The lower ball base 4 has a hollow cylindrical shape,
A lock shaft can be provided coaxially through the opening of the lower ball base. A plurality of pinholes 41 are formed along the axis at one end of the lower ball base, penetrating to the vicinity of the other end, and a lock pin (lower lock pin) 1 is fitted into these pinholes 1 together with a spring. There is. The upper lock pin 3 and the lower lock pin 1 are coaxially provided so that their corresponding end surfaces can come into contact with each other.

The lower lock pin 1 is a cylindrical rod, and a large-diameter disk-shaped convex portion (safety cam ring) 11 is coaxially provided on the circumferential surface near both ends of the rod along the axial direction. The end of the lower lock pin 1 located on the outside of this safety cam ring is connected to an outer small diameter portion 111,
The portion sandwiched between the two safety cam rings 11 is an inner small diameter portion 112 (see Fig. 1A).

The lower pinhole 41 is formed by coaxially communicating a large diameter part 411 opened at the end surface of the lower ball base 4 and a small diameter part having a bottom part. The small diameter portion has a diameter slightly larger than the diameter of the safety cam ring 11.

The diameter of the large diameter portion 411 is set to be sufficiently larger than the diameter of the small diameter portion.

The diameter of the upper pinhole 21 is slightly narrower than the diameter of the large diameter portion 411 of the lower pinhole 41.
The diameter of the small diameter portion is larger than that of the small diameter portion.

For example, if the thickness of the safety cam ring 11 is A, the depth of the large diameter part and the small diameter part is the depth of the large diameter part (from the end surface of the lower ball base 4 to the contact point of the large diameter part and the small diameter part). (distance to edge) is A+
0.1A, and the length (length along the axis) of the front end (outer small diameter portion 111) of the lower lock pin 1 is
It is set up to be 2A.

The large diameter portion 411 of the lower pinhole 41 has a diameter that allows the convex portion of the lower lock pin and the upper lock pin 3 to be inserted loosely, and the small diameter portion of the lower pinhole 41 has a diameter that allows the safety cam ring (convex Part) 1
1 and the upper lock pin 3 are inserted to form a diameter that allows sliding contact.

The axial pin tumbler lock configured as described above has the following effects.

For example, FIG. 3 is a cross-sectional view of the part where the upper ball base 2 and the lower ball base 4 are in contact with each other, and based on this diagram, it is possible to try to unlock the lock using a backward opening type pick tool. Explain that it is impossible.

Insert the steel pin r of the pick tool into each pinhole 41 by hand, push and move the upper lock pin 3, and remove the lower lock pin 1'.
Push it to near the bottom of the lower pinhole 41.
Next, rotate the pick tool left and right. As a result, when the upper ball base 2 slightly rotates left and right, the lower lock pin 1' is pressed by the spring 6 and moves in the lower pin hole 41 in the direction of the upper ball base 2. By its movement,
The position of the locking pin indicated by reference numeral 1 in the figure is reached.
At this time, the safety cam ring 11 collides with the edge 22' of the upper pinhole of the upper ball base 2. All lower lock pins 1 are connected in the same way, and upper pin holes 2
1, the front end of the lower lock pin 1 is inserted into the upper pin hole 21 of the upper ball base 2, so even if you continue to rotate the pick tool at this time, The upper pinhole 21 is locked to the lower lock pin 1, making it difficult to rotate the upper ball base 2. Therefore, it is difficult to unlock the axial pin tumbler lock using this pick tool.

FIGS. 4 and 5 are schematic illustrations of a case where a pick tool of a different type (error type) from the above-mentioned pick tool is used.

First, the upper lock pin 3 is pressed by the steel pin r', and at the same time, the steel pin r' is rotated left and right. Next, when the upper lock pin 3 contacts the exit edge of the lower pin hole 41, the inserted length of the steel pin r' is measured.
The lower lock pin 1 that has moved toward the bottom of the lock pin 1 is tilted slightly to the left or right by the rotation operation, so the safety cam ring 11 comes into contact with the edge of the small diameter opening of the lower pin hole 41. . Therefore, the upper lock pin 3 is prevented from moving by the lower lock pin 1 and cannot come into contact with the outlet edge of the lower pin hole 1. Even if the safety cam ring 11 is inserted into the small diameter part of the lower pinhole 41, the diameter of the upper pinhole 21 is smaller than the diameter of the large diameter opening 411 of the lower pinhole 41, so the upper lock pin 3 is inserted into the lower pinhole. It is inserted into the lower pinhole large diameter opening 411 without contacting the outlet edge of the pinhole 41. Therefore, it becomes difficult to unlock the axial pin tumbler lock.

"Effects of the Present Invention" As described above, the axial pin tumbler lock of the present invention has a lower ball-based lock pin (the lower lock pin 5 has a protrusion along the circumferential surface near the end along the axial direction). , the pinhole in the lower ball base (lower pinhole) is formed with a large diameter part and a small diameter part, and the diameter of this opening is larger than the diameter of the pinhole in the upper ball base (upper pinhole), and The depth of the large diameter portion is smaller than the length along the axis from the tip of the lower lock pin to the inner wall of the convex portion, and the large diameter portion of the lower pinhole is formed between the convex portion of the lower lock pin and the upper lock pin. can be inserted loosely, and the small diameter portion of the lower pinhole is formed so that the convex portion of the lower lock pin and the upper lock pin can be inserted and slid into sliding contact, so that the following effects are achieved.

That is, when the upper pinhole and the lower pinhole are coaxial and communicate with each other, the upper lock pin and the lower lock pin can both move between the upper pinhole and the lower pinhole, while the upper pinhole and the lower pinhole are connected to each other's axes. When the two pins are shifted and communicated, the upper lock pin is not inserted into the small diameter portion of the lower pin hole, or the convex portion of the lower lock pin is not inserted into the small diameter portion of the lower pin hole. Therefore, it is possible to prevent the lock from being easily unlocked by an unlocking device such as a pick tool.

[Brief explanation of drawings]

FIG. 1 is a diagram showing the configuration of an axial pin tumbler lock based on the present invention, and FIG.
Figure 1A is a diagram showing the configuration of the lower lock pin, Figure 1B is a partial cross-sectional view of the lower ball base, Figure 1-
1C is an enlarged view of the part surrounded by the broken line in FIG. 1-1B, FIG. 2-2A is a sectional view of the axial tumbler lock based on the present invention, and FIG. 2-2B is an axial view of the tumbler lock according to the present invention. 3 and 4 are cross-sectional views when a key is inserted into a tumbler lock, and FIGS. 3 and 4 are cross-sectional views when a pick tool is attached to an axial pin tumbler lock based on the present invention. FIG. 3 is a backward opening type pick tool. A cross-sectional view when using
Figure 4 is a cross-sectional view when using an error type pick tool, Figure 5 is an overall view of the error type pick tool, and Figure 6 is a cross-sectional view of the error type pick tool.
6A and 7 are diagrams for explaining the structure of a conventional axial pin tumbler lock,
Fig. 6 is a perspective view showing the overall configuration, Fig. 6A is a cross-sectional view in the width direction, Fig. 7 is a longitudinal sectional view, and Figs. 8 and 9 are inserting a key into a conventional axial pin tumbler lock. FIG. 8 is a vertical sectional view, FIG. 9 is a width sectional view, and FIGS. FIGS. 10 to 12 are cross-sectional views of the pin tumbler lock, and FIGS.
4 and 15 are cross-sectional views when using an error-type pick tool, and FIG. 13 is a perspective view showing the structure of the retractable-release type pick tool. 1... Lower lock pin, 11... Convex part (safety cam ring), 111... Front part (outer small diameter part), 2...
Upper ball base, 3... Upper lock pin, 4... Lower ball base, 41... Lower pin hole, 411...
...Large diameter part.

Claims (1)

[Claims for Utility Model Registration] An axial tumbler lock that has an upper ball base and a lower ball base, and these ball bases are provided with a plurality of pinholes and a plurality of lock pins that communicate with each other, The lock pin (lower lock pin) of the lower ball base is a cylindrical rod, and a disk-shaped convex portion is provided on the circumferential surface near the end along the axial direction thereof coaxially with the lower lock pin, and the lower lock pin is coaxial with the lower lock pin. The pinhole (lower pinhole) of the ball base opens on one end surface of the lower ball base and has a bottom, and from the opening to the bottom there are two parts with different diameters, a large diameter part and a small diameter part. and the diameter of the opening is larger than the diameter of the pinhole (upper pinhole) in the upper ball base, and the depth of the large diameter portion is from the tip of the lower lock pin to the inner wall of the convex portion. The large diameter portion of the lower pinhole has a diameter that allows the convex portion of the lower lock pin and the upper lock pin to be inserted loosely, and the length of the lower pinhole is smaller than the length along the axis of the An axial pin tumbler lock characterized in that the small diameter portion of the lower pinhole has a diameter that allows the convex portion of the lower lock pin and the upper lock pin to be inserted into and come into sliding contact with each other.