JP2003129710A - Cylinder lock - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cylinder lock in which a locking-unlocking key is difficult to conduct a duplication and a wrong unlocking operation is impossible. SOLUTION: The two groups of tumbler groups 6 in which pairs of tumbler pins 5 are arranged in the longitudinal direction of a plug 2 are arrayed to the plug 2 so that the tumbler pins 5 belonging to the different groups are arranged alternately in the longitudinal direction of the plug 2. The tumbler groups 6 and 6 of the two groups are disposed in linear symmetry to a center line in the cross direction of a key inserting groove 8. One tumbler row in either one tumbler group 6 is arranged at a place where the crossed angle θof a tumbler group 11 in the other tumbler group 6 is divided, and the key inserting group 8 is provided with V-shaped projecting sections 10 projecting on the narrow width surface 9 side of the locking-unlocking key 3.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a cylinder lock.

[0002]

2. Description of the Related Art Generally, it is effective to form a code forming recess from a direction inclined by a predetermined angle with respect to a side surface of a locking / unlocking key in order to make it difficult to copy the locking / unlocking key using a copying machine or the like. As a cylinder lock using such a locking / unlocking key, it is disclosed in Japanese Utility Model Laid-Open No. 62-14956.
The one described in Japanese Patent No. 1 is known. In this conventional example, a plug that is rotatably inserted into a plug case is configured by arranging two tumbler rows that advance and retract toward the corners of the key insertion groove.

[0003]

However, in the above-mentioned conventional example, since the tip of the tumbler pin is individually projected into the key insertion groove when the key is not inserted, a wire or a rod-shaped tool is used. It has a drawback that the illegal unlocking operation used is relatively easy.

The present invention has been made to solve the above drawbacks, and an object of the present invention is to provide a cylinder lock in which it is difficult to duplicate a locking / unlocking key and an unauthorized unlocking operation is impossible.

[0005]

According to the present invention, the object is to insert a plug 2 into a plug case 1 so as to be rotatable, and to the plug 2, a locking / unlocking key to be inserted into the plug 2. 2 of the tumbler group 6 in which a pair of tumbler pins 5 that advance and retreat at different angles with respect to the wide surface 4 of 3 and whose axis center lines 5a intersect on the rotation center axis 2a of the plug 2 are arranged in the longitudinal direction of the plug 2. The groups are arranged so that the tumbler pins 5 belonging to different groups in the longitudinal direction of the plug 2 are alternately arranged by giving an urging force from the plug case 1 side toward the center of the plug 2 to the plugs 2. A cylinder lock which allows the rotation of the plug 2 by locating the end of the tumbler pin 5 on the rotation boundary surface 7 between the plug case 1 and the plug 2 when the lock key 3 is inserted. 6 and 6 are key insertion Together are disposed symmetric with respect to 8 the width direction center line of said one of the tumblers group 6
One of the tumbler rows is arranged at a position that divides the intersection angle θ of the tumbler pair 11 in the other tumbler group 6, and
The key insertion groove 8 projects toward the narrow surface 9 side of the locking / unlocking key 3,
V-shaped protrusion 1 that also serves as a guide rail for the locking / unlocking key 3
This is achieved by providing a cylinder lock provided with 0.

In the plug 2, tumbler pairs 11 belonging to different tumbler groups 6 are alternately arranged in the longitudinal direction of the plug 2. The tumbler pin 5 of each tumbler pair 11 has an axis center line 5
When the locking and unlocking key 3 is not inserted, as shown in FIG. 3, for example, the tumbler pin is mounted via the drive pin 18 attached to the plug case 1 as shown in FIG. Plug 2 given to 5
Due to the urging force in the central direction, the tip of the plug 2 pops out on or near the rotation center axis 2a of the plug 2 and the key insertion groove 8
Project inside. In the protruding state of the tumbler pin 5, the end of the tumbler pin 5 on the plug case 1 side does not coincide with the rotation boundary surface 7 between the plug 2 and the plug case 1, and the rotation of the plug 2 is prohibited.

As shown in FIG. 4, when the authentic locking / unlocking key 3 is inserted into the key insertion groove 8, each tumbler pin is formed in the key code forming recess 19 which is opened toward the protruding direction of the tumbler pin 5 into the key insertion groove 8. The tip of 5 abuts and the other end is located on the rotation boundary surface 7 between the plug 2 and the plug case 1, and the rotation of the plug 2 is allowed. The locking / unlocking key 3 used for such a cylinder lock is provided with a key code forming concave portion 19 that is inclined at a predetermined angle with respect to the wide surface 4, and further the projection 10 is fitted to the narrow surface 9. Since the guide groove is provided, it is difficult to duplicate the locking / unlocking key 3 using the copying machine.

In addition to the V-shaped protrusion 10 narrowing the space for inserting a wire or a rod-shaped tool, the front side tumbler pair 11 protruding from different directions is connected to the rear tumbler pair 11. To block the access route of
It is impossible to illegally unlock the cylinder lock by inserting the above tool into the key insertion groove 8 and operating each tumbler pin 5.

The cylinder lock has a plug 2 rotatably inserted into a plug case 1, and the plug 2 is different from the wide surface 4 of the locking / unlocking key 3 inserted in the plug 2. Of the tumbler pins 5 that move forward and backward at different angles, and the axis center line 5a intersects on the rotation center axis 2a of the plug 2, and apply a biasing force to each tumbler pin 5 from the plug case 1 side toward the plug 2 center direction. Of the tumbler pin 5 is arranged in the rotation boundary surface 7 between the plug case 1 and the plug 2 when the authentic locking / unlocking key 3 is inserted into the plug 2 and the rotation of the plug 2 is allowed. Cylinder lock, wherein said at least one tumbler pair 11
Is driven by the drive pin 12 which is held by the locking / unlocking key 3 and pushes out the floating ball 13 which is movable in the thickness direction of the locking / unlocking key 3, and the moving direction of the floating ball 13 following the movement of the floating ball 13. It can be configured to include the driven pin 14.

A tumbler pin 5 which is biased toward the center of the plug 2 is mounted on the plug 2. The tumbler pins 5 are arranged in the longitudinal direction of the plug 2 with two shaft center lines 5a intersecting on the rotation center shaft 2a of the plug 2 as a pair.
Make up.

When the authentic locking / unlocking key 3 is inserted into the key insertion groove 8, as described above, each tumbler pin 5 is inserted into the key code forming recess 19 which is opened in the protruding direction of the tumbler pin 5 into the key insertion groove 8. Since the tip end abuts, the tumbler pin 5 is pushed out to the plug case 1 side, and the other end is positioned on the rotation boundary surface 7 between the plug 2 and the plug case 1, and the rotation of the plug 2 is allowed.

According to this structure, the arbitrary tumbler pair 11 in the tumbler group corresponds to the floating ball 13 held by the locking / unlocking key 3 and moves toward the center of the plug 2 to push out the floating ball 13. 1
2 and a driven pin 14 pushed out to the plug case 1 side by the movement of the floating ball 13. Whether the ends of the drive pin 12 and the driven pin 14 on the plug case 1 side coincide with the rotation boundary surface 7 between the plug case 1 and the plug 2 and whether the rotation of the plug 2 is permitted or not is determined by the floating ball 13 in the unlocked state. Determined by the position of
Since the floating ball 13 can be freely moved by the locking / unlocking key 3 alone, the position of the floating ball 13 at the time of unlocking cannot be reproduced by a copying machine or the like and cannot be duplicated.

The cylinder lock described above is a locking / unlocking key 3 for locking / unlocking a cylinder lock in which a plug 2 having a plurality of tumbler pins 5 is rotatably inserted in a plug case 1, and is a key insertion groove of the plug 2. Blade part 1 inserted in 8
5 is a bottomed ball accommodating hole 16 formed in a direction orthogonal to the wide surface 4 of the blade portion 15, and the ball accommodating hole 1
6 is provided with a ball access hole 17 that is formed in a direction oblique to the wide surface 4 from the side opposite to the open surface and communicates with the ball receiving hole 16, and a spherical floating hole is provided in the ball receiving hole 16. The locking / unlocking key 3 in which the ball 13 is movably accommodated can be used.

In this case, not only is it difficult to duplicate the key because the floating ball 13 is mounted, but the following advantages are obtained because the ball access hole 17 and the ball accommodating hole 16 are not arranged in a straight line. is there. FIG. 6 is an explanatory view showing a case where the ball access hole 17 and the ball accommodating hole 16 are arranged in a straight line, and the drive pin 12 corresponding to the drive pin 12 and the driven pin 14 is attached to the plug case 1. As shown in FIG. 6A, with the locking / unlocking key 3 inserted in the key insertion groove 8 of the plug 2, the ball accommodating hole 16 faces the driven pin 14, and the ball access hole 17 has the driving pin 12. Since the compression spring that biases the drive pin 18 on the drive pin 12 side is stronger than the driven pin 14 side, the drive pin 18
Drive pin 12 urged toward the center of rotation of the plug 2 by the
Enters the ball access hole 17 and pushes the floating ball 13 to the opposite side. In order to move the driven pin 14 entering the ball accommodating hole 16 against the urging force of the driven side drive pin 18 and push out the floating ball 13, the urging force of the drive pin 18 corresponding to the driven pin 14 is applied to the drive pin. It is necessary to make it weaker than the biasing force of the drive pin 18 corresponding to 12, and after that, when the plug 2 is rotated 180 °, as shown in FIG.
The ball access hole 17 corresponds to the driven pin 14, and the ball housing hole 16 corresponds to the drive pin 12. In this state, the floating ball 13 cannot be stopped at the proper position by being pushed by the driven pin 14, and the ends of the drive pin 12 and the driven pin 14 are separated from the rotation boundary surface 7 between the plug 2 and the plug case 1. It is not possible to rotate the plug 2 by shifting it.

On the other hand, in the case of the above configuration, even if the plug 2 is rotated by 180 ° or another angle, the drive pin 12 and the driven pin 14 face the drive pin 18 at a position other than the initial rotation position. Since it does not occur, the reverse of the biasing force does not occur, and the above-mentioned problem does not occur.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION A cylinder lock is formed by rotatably inserting a plug 2 into a plug case 1 as shown in FIGS. The plug 2 has a cylindrical shape, and a key insertion groove 8 extending in the rotation center direction of the plug 2 is formed in the central portion thereof. The key insertion groove 8 has a substantially rectangular cross section that matches the general cross-sectional shape of the blade portion 15 of the locking / unlocking key 3 described later, and the narrow surface corresponding surfaces 8a, 8a ′ of the locking / unlocking key 3 are V-shaped.
A letter-shaped protrusion 10 is provided. Further, as shown in FIG. 3, the key insertion groove 8 is formed at a position where the center 8b is eccentric from the rotation center of the plug 2 by an offset amount δ.

A plurality of tumbler pins 5 are mounted on the plug 2. Each tumbler pin 5 has a large diameter portion 5b and a small diameter portion 5
It is a stepped pin having a circular cross section with c, and has a truncated cone-shaped sensing portion 5d at the tip of the small diameter portion 5c. These tumbler pins 5 are movably accommodated in a tumbler insertion hole 20 formed in the plug 2 in a posture in which the sensing portion 5d faces the key insertion groove 8 so that the shaft center line 5a passes through the rotation center of the plug 2. Will be placed. The tumbler insertion hole 20 is a stepped hole corresponding to the large diameter portion 5b and the small diameter portion 5c of the tumbler pin 5, and the tumbler pin 5 is a step formed at the boundary between the large diameter portion 5b and the small diameter portion 5c. Part for tumbler insertion hole 2
By abutting the step portion on the 0 side, the amount of protrusion into the key insertion groove 8 is regulated.

The tumbler pins 5 are arranged in the plug 2 according to the following rules. First, the two tumbler pins 5 and 5 are arranged in an arbitrary plane orthogonal to the rotation center of the plug 2. As described above, these two tumbler pins 5 have the shaft center line 5a passing through the rotation center shaft 2a of the plug 2 and belonging to the same plane, so that the shaft center line 5a is on the rotation center shaft 2a of the plug 2. A pair of these two tumbler pins 5 intersect each other and are arranged at a predetermined pitch in the direction of the rotation center axis 2a of the plug 2, that is, in the longitudinal direction of the plug 2 at a pitch p to form a tumbler group 6. In this embodiment, the tumbler pair 11 has a shaft center line 5a.
Is composed of a pair of tumbler pins 5 having an intersection angle θ of 135 °, and one of the tumbler pins 5 advances and retreats orthogonally from one of the locking and unlocking key wide surface corresponding surfaces 8c of the key insertion groove 8, and the other tumbler pin 5 The lock / unlock key 3 is advanced / retreated at an inclination angle of 45 ° from the side of the narrow surface 8a of the locking / unlocking key 3 toward the center of the plug 2 of the key insertion groove 8 with respect to the wide surface 8c ′ of the wide surface.

The cylinder lock of the present invention is constructed by disposing a plurality of the tumbler groups 6 in the plug 2. In this embodiment, in the plug 2, two tumbler groups 6 having the same intersection angle θ in the tumbler pair 11 and the same pitch p between the tumbler pairs 11 are arranged on the center line in the width direction of the key insertion groove 8. Tumbler group 6 arranged in line symmetry with respect to one another
The tumbler pins 5 are arranged at positions that divide the intersection angle θ of the other tumbler group 6. Further, as shown in FIG. 2, the tumbler groups 6 of these two groups are arranged so as to be displaced by a half pitch in the longitudinal direction of the plug 2, so that in the longitudinal direction of the plug 2, different tumbler groups are arranged at every half pitch. The tumbler pairs 11 belonging to 6 are arranged. In order to show the relationship between the tumbler groups 6, in FIG. 2, the sweep surface by the axis center lines 5a, 5a of the tumbler pair 11 belonging to one tumbler group 6 is designated by reference numeral 6A, and the tumbler pair 11 belonging to the other tumbler group 6 is shown.
The sweep surface by the axis center lines 5a, 5a of 6 is denoted by reference numeral 6B, and the surface formed by the axis center line 5a of the tumbler pin 5 belonging to one tumbler group 6 is denoted by reference numeral 6A 'and the other tumbler is shown in FIG. Tumbler pin 5 belonging to group 6
The surface formed by the axis center line 5a is designated by reference numeral 6B '.

On the other hand, the plug case 1 has the plug 2
A drive pin insertion hole 1a communicating with each tumbler insertion hole 20 is formed. The drive pin insertion hole 1a and the tumbler insertion hole 20 are arranged in a straight line so as to face each other, and the drive pin 18 is inserted into the drive pin insertion hole 1a. The drive pin 18 is the large-diameter portion 5 of the tumbler pin 5.
It is a cylindrical body having substantially the same diameter as b, and is urged toward the center of the plug 2 by the compression spring 21.

With the above structure, the tumbler pin 5 in the plug 2 is pushed by the drive pin 18 and protrudes into the key insertion groove 8 when the locking / unlocking key 3 described later is not inserted into the key insertion groove 8. As shown in FIG. 3, in the projecting state, the tips of the sensing portions 5d are mutually connected to the rotation center shaft 2a of the plug 2.
The dimensions of the step are appropriately determined so that they make contact with each other. When the tumbler pin 5 projects into the key insertion groove 8, the tip of the drive pin 18 enters the plug 2 beyond the rotation boundary surface 7 between the plug 2 and the plug case 1, so that the rotation boundary surface 7 is driven by the drive pin 18. It is closed and the plug 2 cannot be rotated. From this state, the tumbler pin 5 on the front side closes the access path to the tumbler pin 5 on the rear side even if the tumbler pin 5 is operated by using a rod-shaped or wire-shaped tool to illegally unlock the cylinder lock. Therefore, the unlocking operation becomes very difficult.
In addition, since the V-shaped protruding portion 10 is provided on the narrow surface corresponding surface 8a of the locking / unlocking key 3 near the center of the plug 2,
It is impossible to insert a tool from the area, and from the opposite area, that is, the narrow surface corresponding surface 8a ′ near the peripheral edge of the plug 2, the tumbler pair 11 of one tumbler group 6 is inserted.
Since it is not possible to access the tumbler pin 5 at a position that divides the intersection angle θ between them, it is not possible to perform unauthorized unlocking using a jig.

The locking / unlocking key 3 used for the cylinder lock is shown in FIG. 1 (b). The locking / unlocking key 3 has a blade portion 15 having a grip portion 3a at its tip. The blade portion 15 is a flat-plate key having a rectangular cross-sectional shape, and the narrow surface 9 has a V-shaped guide groove 15 into which the protrusion 10 of the plug 2 can be fitted.
a is formed. As shown in FIGS. 1 and 4, the blade portion 1
5, a plurality of key code forming concave portions 19 are provided by dimple processing, and each key code forming concave portion 19 faces the end surface of the sensing portion 5d of the tumbler pin 5 when inserted into the key inserting groove 8 of the plug 2. , Has an axis center coinciding with the axis center line 5a of each tumbler pin 5. It is difficult to form the guide groove 15a on the narrow surface 9 of the blade with a copying machine having a normal precision, and a key code forming concave portion which is opened in an oblique direction with respect to the wide surface 4 of the blade portion 15 is formed. Since it is generally difficult to accurately copy 19 with a copying machine, it is difficult to duplicate the locking / unlocking key 3.

When the blade portion 15 of the locking / unlocking key 3 configured as described above is inserted into the key insertion groove 8 of the plug 2,
The tumbler pin 5 is fitted in each key code forming recess 19, and the tumbler pin 5 moves from the initial position to the position corresponding to the depth of the key code forming recess 19 toward the plug case 1. When the depth of the key code forming recess 19 matches the type of the corresponding tumbler pin 5, that is, when the inserted locking / unlocking key 3 is authentic, as shown in FIG. The tip of the diameter portion 5b is located on the rotation boundary surface 7 between the plug 2 and the plug case 1, and the rotation of the plug 2 is allowed. On the other hand, when the depth of the key code forming concave portion 19 is too deep, the drive pin 18 is rotated by the rotation boundary surface 7.
, And if the key code formation recess 19 is too shallow,
The tumbler pin 5 closes the rotation boundary surface 7 and prohibits the rotation of the plug 2.

In this embodiment, the key code forming recess 19 is provided at the intersection of the center line in the width direction and the center line in the thickness direction of the blade portion 15 so that it can be used even when the blade portion 15 is turned upside down. On the other hand, two pieces having the same shape are formed at point symmetrical positions.

Further, as shown in FIG. 5, the blade portion 15 is provided with a ball accommodating hole 16 and a ball access hole 17 corresponding to any one of the tumbler pairs 11, and the ball accommodating hole 16 has a spherical floating ball. 13 is movably accommodated. The ball accommodating hole 16 has the blade portion 15
Is a circular hole opened in a direction orthogonal to the wide surface 4 of the above, and is provided with a bottom wall 16a made of a cone, and the opening end is caulked to prevent the floating ball 13 from falling off. The floating ball 13 can be used even when the blade portion 15 is turned upside down, like the key code forming recess 19 described above, the floating ball 13 is pointed with respect to the intersection of the width direction center line and the thickness direction center line of the blade portion 15. Two pieces are arranged at symmetrical positions.

On the other hand, the plug 2 has the ball receiving hole 16 described above.
The driven pin 14 and the drive pin 12 are arranged facing each other and the ball access hole 17, respectively. These driven pins 14
The drive pin 12 and the drive pin 12 are stepped pins having the large diameter portions 14a and 12a and the small diameter portions 14b and 12b like the tumbler pin 5 described above, and the drive pin 18 on the plug case 1 side.
Is urged toward the center of the plug 2 via. Further, the spring force of the compression spring 21 for urging the drive pin 18 toward the center of the plug 2 is the pushing force of the driving pin 12 to the driven pin 14 side of the floating ball 13,
It is set so as to be larger than the pushing down force of the floating ball 13 by the driven pin 14.
In the state where 2 is facing the ball access hole 17 and the driven pin 14 is facing the ball accommodating hole 16, the floating ball 13 is always held at a position floating from the bottom wall 16 a of the ball accommodating hole 16. The floating amount of the floating ball 13 in this state can be managed by either the locking / unlocking key 3 or the drive pin 12 side.
In order to control the floating amount of the floating ball 13 on the side, a reference portion for restricting the floating amount of the floating ball 13 is provided at the opening end of the ball accommodating hole 16, and when the floating ball 13 receives a pushing force from the drive pin 12, It is performed so as to float until it contacts the reference portion. The management on the drive pin 12 side is the drive pin 1
The protrusion amount of 2 is controlled by the step portion of the tumbler insertion hole 20.

Therefore, in this embodiment, when the locking / unlocking key 3 is not inserted, the drive pin 1
2 and the driven pin 14 are urged toward the center of the plug 2 by the drive pin 18, and the drive pin 18 moves toward the plug 2
The rotation of the plug 2 is prohibited to close the rotation boundary surface 7 between the plug case 1 and the plug case 1. As shown in FIG. 5, when the locking / unlocking key 3 is inserted, the drive pin 12 enters into the ball housing hole 16 from the ball access hole 17 and pushes up the floating ball 13 by a predetermined amount. In this state, the end portions of the driven pin 14 and the drive pin 12 on the plug case 1 side coincide with the outer peripheral surface of the plug 2, and the rotation boundary surface 7 between the plug 2 and the plug case 1 is opened to allow the rotation of the plug 2. To do.

As described above, the locking / unlocking key 3 provided with the floating ball 13 moving in the ball accommodating hole 16 is extremely difficult to copy by the copying machine, and
As shown in this embodiment, when the floating ball 13 is set to project from the general surface (the wide surface 4 in this embodiment) of the blade portion 15 in the unlocked state, the floating state is imitated and copied. Since the locking / unlocking key 3 duplicated by the processing machine cannot be inserted from the key insertion groove 8, duplication by the copying machine becomes impossible.

[0029]

As is apparent from the above description, according to the present invention, it is possible to make a copy of the locking / unlocking key and an unauthorized unlocking operation impossible.

[Brief description of drawings]

FIG. 1 is a diagram showing the present invention, in which (a) is a perspective view of a cylinder lock showing the arrangement of tumbler pins, and (b) is a perspective view of a locking / unlocking key.

FIG. 2 is a sectional view of a cylinder lock.

FIG. 3 is a sectional view taken along line 3A-3A in FIG.

FIG. 4 is a sectional view corresponding to FIG. 3, showing a state in which a genuine locking / unlocking key is inserted.

5 is a sectional view taken along line 5A-5A in FIG.

6A and 6B are explanatory views showing a state in which a ball accommodating hole and a ball access hole are arranged in a straight line, FIG. 6A shows an unlocked state, and FIG. 6B shows a state rotated by 180 °.

[Explanation of symbols]

1 plug case 2 plugs 2a Rotation center axis 3 Lock / Unlock Key 4 wide surface 5 tumbler pins 5a axis center line 6 tumblers 7 rotation boundary 8 key insertion groove 9 narrow surface 10 Projection 11 tumbler pair 12 drive pins 13 floating balls 14 Driven pin 15 Blade part 16 ball hole 17 ball access hole θ crossing angle

Claims (2)

[Claims] 1. A plug is rotatably inserted into a plug case, and the plug is moved forward and backward at different angles with respect to a wide surface of a locking / unlocking key inserted in the plug, and the shaft center Two tumbler groups, in which pairs of tumbler pins whose lines intersect on the rotation center axis of the plug, are arranged in the longitudinal direction of the plug, so that the tumbler pins belonging to different groups in the longitudinal direction of the plug are alternately arranged The tumbler pin end is located on the rotation boundary between the plug case and the plug when a genuine locking / unlocking key is inserted into the plug to allow rotation of the plug. In the cylinder lock, the two tumbler groups are arranged line-symmetrically with respect to the center line in the width direction of the key insertion groove, and one tumbler row in any one of the tumbler groups. Is
It is arranged at a position that divides the crossing angle of the tumbler pair in the other tumbler group, and projects into the narrow surface side of the locking and unlocking key in the key insertion groove,
A cylinder lock with a V-shaped protrusion that doubles as a guide rail for the locking / unlocking key. 2. When the locking / unlocking key is not inserted into the key insertion groove, the two tumbler pins forming the tumbler pair make the tips of the sensing parts contact each other on the central axis of rotation of the plug and the key insertion groove. The cylinder lock according to claim 1, which projects inward.