JP2008144522A - Locking mechanism - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a locking mechanism in which it is difficult to align checking members with normal positions by illegal operation. <P>SOLUTION: This locking mechanism has a rotary member, a housing for rotatably storing the rotary member and a plurality of baffles stored in at least the rotary member, and locking and unlocking by advancing and retreating the plurality of baffles in the direction orthogonal to a shear line. The locking mechanism has a storage space orthogonal to the advancing-retreating direction of the baffle by straddling the housing and the rotary member, and is constituted so that a lock plate for constituting a part of the baffles is stored in the storage space, and the lock plate can rock while crossing with the shear line by abutting on at least two other baffles, and a surface orthogonal to the advancing-retreating direction of the baffles of the lock plate, coincides with the shear line in unlocking. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a locking mechanism and a lock, and more particularly to a locking mechanism that suppresses unauthorized unlocking (picking).

As a lock provided with a locking mechanism for suppressing unauthorized unlocking, for example, in Patent Document 1, a pair of left and right side bar accommodation holes is provided in a plug, and two lock pin accommodation holes on the left and right sides are opposite to the key insertion holes. The base plate of the pair of left and right side bars is fitted into the slits in the bottom wall of the side bar receiving hole, and the key is removed, and the tip of the side bar is fixed by the bias of the leaf spring. A side bar type cylinder locking device is disclosed in which the rotation restraint of the plug with respect to the fixed case is performed at two positions on the left and right sides.
JP 2000-314250 A (Claim 1, paragraphs 0008 to 0009, FIG. 1)

  In the cylinder lock of Patent Document 1, when locking, a pair of left and right side bars protrudes from a rotatable plug in a direction perpendicular to the lock pin, and the side bars engage with the locking recesses of the fixed case to rotate the plug. Is restrained. When a key is inserted for unlocking and the lock pins are aligned at regular positions, the rotation of the plug is released by the side bar escaping into the side bar receiving hole formed in each lock pin. Thus, unauthorized unlocking is suppressed by releasing the rotational restraint by the sidebar only when all the lock pins are in the proper positions.

However, the cylinder lock of Patent Document 1 has room for improvement in that it does not include a means for making it difficult to align each lock pin with a normal position by an unauthorized operation.
In order to solve this problem, an object of the present invention is to provide a locking mechanism in which it is difficult to align a locking member such as each lock pin in a proper position by an unauthorized operation.

  The present invention includes a rotating member, a housing that rotatably accommodates the rotating member, and at least a plurality of stopping members that are housed in the rotating member, and the plurality of stopping members are positioned at the boundary between the rotating member and the housing. A locking mechanism that locks and unlocks the door by moving it forward and backward in a direction substantially perpendicular to the shear line and intersecting the shear line is assumed.

  The feature of the present invention based on this premise is that the housing and the rotating member are straddled and the housing space is provided substantially perpendicular to the advancing and retreating direction of the restraining member, and the housing space accommodates a lock plate constituting a part of the restraining member. The surface of the lock plate can be swung while abutting at least two other stop members and intersecting the shear line. When unlocked, the surface substantially perpendicular to the advancing and retreating direction of the stop member of the lock plate may coincide with the shear line.

  In one embodiment of the present invention, the housing is provided with spring biasing means for biasing the lock plate toward another restraining member that abuts the lock plate.

  In another embodiment, the spring urging means is a coil spring, and a contact member that contacts the lock plate is provided at a portion where the coil spring faces the lock plate.

  In another embodiment, the restraining member includes a plurality of under pins and a plurality of driver pins, and the under pins and the driver pins are disposed in a direction perpendicular to the rotation axis of the rotating member.

  In another embodiment, the restraining member includes a plurality of disks having insertion holes through which the keys are inserted, and the plurality of disks are arranged in a direction perpendicular to the rotation axis of the rotating member.

  In another embodiment, the restraining member includes a plurality of cord pins and a plurality of under pins, and the cord pins and the under pins are disposed in a direction parallel to the rotation axis of the rotating member.

  In the present invention, the lock plate is accommodated in the accommodating space extending between the rotating member and the housing so as to be able to swing while abutting at least two restraining members and intersecting the shear line. A plane substantially perpendicular to the advancing / retreating direction of the member is adapted to match the shear line.

  On the other hand, when locked, the surface of the locking plate that is substantially perpendicular to the advancing and retracting direction of the locking member does not coincide with the shear line, and swings in contact with at least two other blocking members in the accommodation space. It is possible to cross the shear line. Therefore, when the stop member is moved in order to unlock it illegally, the lock plate swings and intersects the shear line to prevent the rotation member from rotating.

  In other words, for the purpose of unauthorized unlocking, even if an attempt is made to match the shear line by applying a force in the direction in which the rotating member rotates, the locking member prevents the rotating member from rotating. It becomes difficult to detect that the sword is aligned with the shear line. This makes it difficult to align the stop member with the correct position by an unauthorized operation.

  Further, in the present invention, since the lock plate has a thickness, the displacement of the restraining member from the normal position is enlarged. Therefore, when trying to match the lock plate to the shear line by an unauthorized operation, the position of the stop member must be simultaneously and strictly adjusted to the normal position. This also makes it difficult to align the stop member with the proper position by an unauthorized operation.

  In the aspect in which the housing is provided with a spring urging means for urging the lock plate toward the other restraining member, the lock plate is pressed against the restraining member by the spring urging means, so that the lock plate is surely followed by the movement of the restraining member. Can be made.

  A coil spring can be suitably used as the spring urging means. Further, if a contact member that contacts the lock plate is provided in a portion where the coil spring faces the lock plate, the coil spring can be reliably contacted to the lock plate by the contact member.

  In a mode in which the restraining member includes a plurality of under pins and a plurality of driver pins, and the under pins and the driver pins are provided in a direction perpendicular to the rotation axis of the rotating member, the locking mechanism of the present invention is suitable for a so-called pin tumbler lock. Applicable.

  In a mode in which the restraining member includes a plurality of discs having insertion holes through which a key is inserted, and the plurality of discs are provided in a direction perpendicular to the rotation axis of the rotating member, the locking mechanism of the present invention is a so-called disc tumbler lock. It can be suitably applied to.

  In a mode in which the restraining member includes a plurality of cord pins and a plurality of under pins, and the cord pins and the under pins are provided in a direction parallel to the rotation axis of the rotating member, the locking mechanism of the present invention is suitable for a so-called 80,000 lock lock. Applicable to.

<First Embodiment>
The locking mechanism according to the present invention will be described with reference to the accompanying drawings.
In this embodiment, the locking mechanism according to the present invention is applied to the pin tumbler lock 10, and FIG. 1 schematically shows the state of the locking mechanism when the key K is inserted into the pin tumbler lock 10 and unlocked. It is sectional drawing.

  The pin tumbler lock 10 includes a columnar rotary member 2 having a keyhole 4 and a housing 3 that rotatably accommodates the rotary member 2, and a shear line SL is located at the boundary between the rotary member 2 and the housing 3. Further, the restraining member 5 of the pin tumbler lock 10 includes an under pin 51, a driver pin 52 and a lock plate 6. Furthermore, an accommodation space 7 that spans the rotating member 2 and the housing 3 and accommodates the lock plate 6 is provided. Further, the lock plate 6 is spring-biased toward an underpin 51 that contacts the lock plate 6 by a coil spring 8 that is a spring biasing means. In other words, the lock plate 6 is urged by the coil spring 8 toward the rotating shaft.

  The rotating member 2 has a key hole 4 extending in a direction parallel to the rotation axis (hereinafter referred to as a rotation axis direction X), and a direction orthogonal to the rotation axis of the rotation member 2 from the key hole 4 (hereinafter referred to as a diameter direction Y). And a plurality of underpin holes 11 that slidably accommodate the underpins 51. A plurality of driver pin holes 12 that can communicate with the underpin hole 11 and slidably receive the driver pin 52 extend in the diameter direction Y in the housing 3. That is, the advancing / retreating direction of the under pin 51 and the driver pin 52 is the diameter direction Y.

  The lock plate 6 is a plate-like member that can come into contact with two adjacent under pins 51. The length of the lock plate 6 in the rotation axis direction X is greater than the minimum distance between two adjacent under pins 51, more preferably greater than the distance between the central axes of the two under pins 51. Further, the width of the lock plate 6 is substantially the same as or slightly larger than that of the underpin 51.

  The accommodation space 7 in which the lock plate 6 is accommodated is provided in a direction substantially orthogonal to the advancing / retreating direction of the under pin 51 and the driver pin 52 and parallel to the rotation axis direction X. The accommodation space 7 is formed so that the lock plate 6 is completely accommodated on the rotating member 2 side. That is, the dimension in the diameter direction Y of the accommodation space 7 on the rotating member 2 side (hereinafter referred to as the depth of the accommodation space 7) is greater than the dimension in the diameter direction Y of the lock plate 6 (hereinafter referred to as the thickness of the lock plate 6). Is also formed large. The length and width of the accommodation space 7 are slightly larger than the lock plate 6. As a result, the lock plate 6 can swing while intersecting the shear line SL in the accommodating space 7 extending over the rotating member 2 and the housing 3.

  An abutting member 9 is provided at a portion of the coil spring 8 that biases the lock plate 6 that faces the lock plate 6. In the present embodiment, the driver pin 52 also serves as the contact member 9, but the contact member 9 may have a shape different from that of the driver pin 52. By urging the lock plate 6 toward the under pin 51 in this way, the lock plate 6 can be pressed against the under pin 51 to reliably follow the movement of the under pin 51. Further, by providing the contact member 9, the coil spring 8 can be reliably contacted. Note that the driver pins 52 (two on the left side in FIG. 1) that do not contact the lock plate 6 are also spring-biased toward the under pins 51.

  As shown in FIG. 1, when the key K is inserted into the keyhole 4, the boundary between the driver pin 52 and the under pin 51 that is not in contact with the lock plate 6 matches the shear line SL. Further, the boundary between the surface A substantially perpendicular to the diameter direction Y of the lock plate 6 and the contact member 9 (driver pin 52) coincides with the shear line SL. That is, the restraining member 5 is in a state of leaving the shear line SL. Thereby, the rotation member 2 becomes rotatable with respect to the housing 3, and the pin tumbler lock 10 is unlocked. Here, in order to smoothly rotate the rotating member 2, the surface A of the lock plate 6 that matches the shear line SL is preferably a surface having the same curvature as the outer peripheral surface of the rotating member 2.

FIG. 2 is a cross-sectional view schematically showing the locked state of the pin tumbler lock 10.
When the key K (not shown) is removed from the keyhole 4, the driver pin 52 and the contact member 9 advance toward the shear line SL and intersect as shown in FIG. As a result, the rotation of the rotating member 2 with respect to the housing 3 is prevented, so that the pin tumbler lock 10 is locked. At this time, the lock plate 6 is separated from the shear line SL and is in contact with the underpin 51.

  Next, with reference to FIG. 3, the effect which the locking mechanism of this invention makes unauthorized unlocking difficult is demonstrated. FIG. 3 is an enlarged view of the lock plate 6 and its surroundings. When the pin tumbler lock 10 is locked, the left underpin 51a is pushed in the diametrical direction Y by an unauthorized operation. Represents a state.

When the left underpin 51a is pushed in the diameter direction Y, the lock plate 6 that is in contact with the underpin 51a swings in the accommodation space 7 and intersects the shear line SL, so that the rotating member 2 rotates relative to the housing 3. Stop movement.
That is, even if the underpin 51a coincides with the shear line SL by an unauthorized operation of pressing the underpin 51a while applying a force in the direction in which the rotating member 2 rotates, the rotating member 2 does not slightly move. For this reason, a clue to know that the underpin 51a matches the shear line SL cannot be obtained from the outside, and it becomes difficult to align the underpin 51a, in other words, the stop member 5 to the proper position by an unauthorized operation.

  Further, as shown in FIG. 3, the positional deviation Da between the apexes Ta and Tb of the two under pins 51a and 51b is expanded to the positional deviation Db because the lock plate 6 has a thickness. Accordingly, if the positions of the two under pins 51 are slightly shifted, the lock plate 6 prevents the rotation member 2 from rotating relative to the housing 3. The underpins 51a and 51b must be precisely and simultaneously aligned with the normal positions. This also makes it difficult to align the stop member 5 with the proper position by an unauthorized operation.

  That is, not only the case where the underpins 51 are aligned with the shear line SL one by one, but also when all the underpins 51 are simultaneously moved by an unauthorized operation to try to unlock them by matching the shear line SL for a moment, the underpins 51 Therefore, it is difficult to align the stop member 5 with the proper position by an unauthorized operation.

  In general, when the a and 51b misalignment of the two under pins 51 is small, there is a possibility that the pin tumbler lock 10 may be pry open by forcibly turning the rotating member 2. However, in the present invention, since the rotation of the rotating member 2 is also prevented by the lock plate 6, it is difficult to perform unauthorized unlocking. In this case, it is preferable to make the side surface S of the lock plate 6 orthogonal to the rotational direction of the rotating member 2 flat. Thereby, since the side surface S is in surface contact with the side wall of the accommodating space 7 in a wide range, it is difficult to pry open the rotating member 2 by applying a force when unlocking it.

<Second Embodiment>
A second embodiment in which the locking mechanism according to the present invention is applied to a disc tumbler lock 20 will be described with reference to FIGS. The present embodiment is the main difference from the first embodiment in that the restraining member 5 is constituted by a disk 53. In the following description, a part of the description overlapping the first embodiment is omitted.

  FIG. 4 is an exploded perspective view for explaining main components of the disc tumbler lock 20. The disk tumbler lock 20 includes a rotating member 2 having a key hole 4, a housing 3 that rotatably accommodates the rotating member 2, and a plurality of disks that are accommodated in the rotating member 2 so that a part of the key hole 4 is exposed. 53. Furthermore, it has an accommodating space 7 that spans the rotating member 2 and the housing 3 and accommodates the lock plate 6. Further, the housing 3 is provided with a coil spring 8 that urges the lock plate 6 toward the key hole 4 and an abutting member 9 provided at a portion where the coil spring 8 faces the lock plate 6.

  The disk 53 is a vertically long plate-like member provided with an insertion hole 21 through which the key K is inserted, and the long side 22 can advance and retreat along a direction substantially orthogonal to the rotation axis direction X of the rotating member 2. is there. Further, the short side 26 of the disk 53 extends in a direction substantially orthogonal to the long side 22. Further, the disk 53 has a protrusion 23 on the long side 22 and is housed together with a spring 25 in a disk hole 24 provided in the rotating member 2. The disk 53 is urged by a spring 25 in contact with the rotating member 2 and the protrusion 23 in a direction away from the rotating shaft along a diameter direction Y substantially perpendicular to the rotating shaft direction X of the rotating member 2. It can slide in the hole 24.

  The storage space 7 is provided so that the disk 53 biased by the spring 25 can enter when locked. The accommodation space 7 is formed such that the depth on the rotating member 2 side is larger than the thickness of the lock plate 6, and the depth on the housing 3 side is smaller than the thickness of the lock plate 6. (See FIGS. 5 and 6) The entire depth of the accommodation space 7 is larger than the thickness of the lock plate 6, and the lock plate 6 can swing in the accommodation space 7.

  FIG. 5 is a cross-sectional view schematically showing the state of the locking mechanism when the disc tumbler lock 20 is unlocked. However, the illustration of the spring 25 is omitted. When the key K is inserted into the key hole 4, the disk 53 is moved toward the rotating shaft against the spring 25 and retracts from the accommodating space 7, and is against the shear line SL located at the boundary between the rotating member 2 and the housing 3. When the boundary between the short side 26 of the disk 53 and the surface A perpendicular to the advancing / retreating direction of the lock plate 6 and the boundary of the abutting member 9 is matched, unlocking is performed.

  When the key K is removed from the state of FIG. 5, as a result of the disk 53 and the lock plate 6 advancing and crossing toward the shear line SL by the bias of the spring 25, the disk tumbler lock 20 is locked as shown in FIG. It will be in the state. The length of the disk 53 in contact with the lock plate 6 in the diameter direction is set to such a length that the lock plate 6 does not contact the receiving space 7 even in the locked state. When in this state, the lock plate 6 can swing in the accommodation space 7.

FIG. 7 is an enlarged view of the periphery of the lock plate 6 and shows a state in which one disk 53a that is in contact with the lock plate 6 is illegally moved toward a normal position at the time of unlocking.
As shown in FIG. 7, when the disk 53a is moved in the direction opposite to the arrow indicating the diameter direction Y, that is, toward the rotation axis of the rotating member 2, the lock plate 6 swings while intersecting the shear line SL, The rotation member 2 is prevented from rotating with respect to the housing 3.
As a result, as in the first embodiment, it is difficult to align the stop member 5 with the proper position by an unauthorized operation.

As described above, the example in which the locking mechanism according to the present invention is applied to the disc tumbler lock 20 has been described. However, it is also possible to modify the locking mechanism.
For example, instead of the configuration in which the lock plate 6 intersects the shear line SL at the time of locking, the lock plate 6 can be completely accommodated in the accommodation space 7 on the housing 3 side and the disk 53 can intersect the shear line SL.
Alternatively, instead of the configuration in which the disk 53 enters the housing space 7 when locked, the disk 53 can be withdrawn from the housing space 7 when locked. In this configuration, for example, the boundary between the disk 53 and the lock plate 6 is unlocked so as to coincide with the shear line SL, and the lock plate 6 or the abutting member 9 is locked by intersecting the shear line SL.

<Third Embodiment>
With reference to FIGS. 8-10, 3rd Embodiment which applied the locking mechanism based on this invention to the 80,000 lock | rock 30 is described. The present embodiment is different from the first embodiment in that the restraining member 5 includes a cord pin 54 and an underpin 55, and the restraining member 5 moves in a direction parallel to the insertion direction of the key K. Is the main difference. In the following description, a part of the description overlapping the first embodiment is omitted.

  FIG. 8 is an exploded perspective view showing main components of the 80,000 lock 30. The 80,000 lock 30 includes a rotating member 2, a shell 31 having a key hole 4, and a fixed plug 32, and a housing 3 that rotatably accommodates the rotating member 2, and a part thereof exposed to the key hole 4. A plurality of cord pins 54 and under pins 55 provided on the rotating member 2 and a restraining member 5 constituted by the lock plate 6 are provided. The cord pin 54 and the underpin 55 can advance and retreat in a direction parallel to the rotation axis direction X of the rotating member 2.

  The 80,000 lock 30 further includes an accommodation space 7 that spans the fixed plug 32 and the rotary member 2 of the housing 3 and accommodates the lock plate 6. The fixed plug 32 is provided with a coil spring 8 that urges the under pin 55 toward the cord pin 54, and an under pin that abuts the lock plate 6 and serves as the abutment member 9 at a portion where the coil spring 8 faces the lock plate 6. 55 is located. The shear line SL of the 80,000 lock 30 is located at the boundary between the rotating member 2 and the fixed plug 32. Further, the underpin 55 is formed to a length that allows the tip portion to be exposed in the accommodation space 7 when the 80,000 lock 30 is in the locked state.

  The plurality of code pins 54 extend from the key hole 4 side of the rotating member 2 in the rotation axis direction X, pass through the rotating member 2, and slide into the code pin holes 33 arranged on the same circumference around the rotation axis. It is stored movably. The key K has a key groove 56 provided in the rotation axis direction X of the rotary member 2 at a position corresponding to each code pin 54. When the key K is inserted into the key hole 4, the code pin 54 faces the shear line SL. The rotary member 2 moves in the rotation axis direction X. The plurality of under pins 55 are slidably accommodated in an under pin hole 34 that extends in the rotation axis direction X so as to face the code pin hole 33, and are attached to the code pin 54 by a spring 35 that is accommodated together. Be forced.

The lock plate 6 has an arc shape along the circumference where the code pin 54 is disposed, and has a size capable of coming into contact with the two adjacent under pins 55 and the code pins 54.
The accommodating space 7 is substantially orthogonal to the rotational axis direction X of the rotating member 2, and the lock plate 6 is completely accommodated on either the rotating member 2 side or the fixed plug 32 side as in the first embodiment. It is formed as follows. Accordingly, the lock plate 6 can swing while intersecting the shear line SL in the accommodation space 7.

  FIG. 9 is a perspective view schematically showing a state where the key K is inserted into the 80,000 lock lock 30 and unlocked, and the lock plate 6, the under pin 55 and the code pin 54 that come into contact with the lock plate 6 are shown. Is indicated by a solid line, and the rotating member 2 is indicated by an imaginary line. In addition, illustration of the code pin 54, the underpin 55, the key K, the shell 31, and the fixed plug 32 other than this is abbreviate | omitted.

  When the 80,000 lock 30 is unlocked, the two cord pins 54 are in contact with the lock plate 6. Further, a plane A that is substantially orthogonal to the advancing and retreating direction of the underpin 55 of the lock plate 6 and a boundary between the underpin 55 and the shear line SL. Further, the boundary between the code pin 54 and the underpin 55 other than this not shown also coincides with the shear line SL. Thereby, the rotating member 2 can be rotated with respect to the housing 3.

  When the key K is removed from the state of FIG. 9, the underpin 55 urged by the coil spring 8 enters the shear line SL and is locked by being crossed. At this time, the lock plate 6 is accommodated in the accommodation space on the rotating member 2 side. 7 is completely accommodated (not shown).

  FIG. 10 is a perspective view schematically showing a state in which the cord pin 54a is pushed in the rotational axis direction X toward the shear line SL by an unauthorized operation when the 80,000 lock 30 is locked. is there. As shown in FIG. 19, when the code pin 55 a is moved in the rotation axis direction X, the lock plate 6 swings while intersecting the shear line SL, thereby preventing the rotation member 2 from rotating relative to the housing 3. As a result, as in the first embodiment, it is difficult to align the stop member 5 with the proper position by an unauthorized operation.

  Furthermore, since the lock plate 6 has an arc shape, the surface A that is substantially perpendicular to the advancing / retreating direction of the underpin 55 is inclined with respect to the shear line SL in the accommodating space 7 as shown in FIG. Is possible. As a result, the misalignment of the two under pins 55 is further enlarged, and it becomes more difficult to align the stop member 5 with the normal position by an unauthorized operation.

As described above, the locking mechanism according to the present invention has been described based on the embodiment, but the present invention is not limited to this and can be implemented with various modifications.
For example, the abutting member 9 can be omitted and the coil spring 8 can be brought into direct contact with the lock plate 6. In this case, the shear line SL is configured to coincide with the boundary between the lock plate 6 and the restraining member 5 in contact therewith. Alternatively, the number of coil springs 8 can be reduced in the first and second embodiments, or another type of spring such as a leaf spring can be used instead of the coil spring 8. As a result, the number of parts of the pin tumbler lock 10 can be reduced.

Furthermore, the storage space 7 and the lock plate 6 can be provided at two or more locations, and the lock plate 6 can be brought into contact with three or more stop members 5.
Further, if the contact surface of the restraining member 5 and the contact member 9 with the lock plate 6 is a curved surface such as a convex bent surface or a curved surface toward the lock plate 6, the lock plate 6 becomes the contact surface. It is preferable because it moves smoothly along the axis and swings smoothly.

Sectional drawing when the locking mechanism of 1st Embodiment is unlocked. Sectional drawing when the locking mechanism of 1st Embodiment is locked. The lock plate of 1st Embodiment and the enlarged view of the circumference | surroundings. The disassembled perspective view showing the main components of the locking mechanism of 2nd Embodiment. Sectional drawing when the locking mechanism of 2nd Embodiment is unlocked. Sectional drawing when the locking mechanism of 2nd Embodiment is locked. The lock plate of 2nd Embodiment and the enlarged view of the circumference | surroundings. The disassembled perspective view showing the main components of the locking mechanism of 3rd Embodiment. The perspective view which represents typically the state by which the locking mechanism of 3rd Embodiment was unlocked. The perspective view showing a mode when the locking mechanism of 3rd Embodiment is improperly operated.

Explanation of symbols

2 Rotating member 3 Housing 4 Key hole 5 Stopping member 6 Lock plate 7 Storage space 8 Coil spring (spring urging means)
9 Contact member 11 Under pin hole 12 Driver pin hole 24 Disc hole 26 Disc side 33 Code pin hole 34 Under pin hole 51 Under pin 52 Driver pin 53 Disc 54 Code pin 55 Under pin 56 Key groove A Lock plate surface SL Shear line

Claims (6)

A rotating member; a housing that rotatably accommodates the rotating member; and at least a plurality of restraining members that are accommodated in the rotating member.
In the locking mechanism that locks and unlocks the plurality of restraining members by advancing and retreating in a direction substantially orthogonal to a shear line located at the boundary between the rotating member and the housing and intersecting the shear line,
A housing space extending across the housing and the rotating member and substantially perpendicular to the advancing and retracting direction of the restraining member;
A lock plate constituting a part of the restraining member is housed in the housing space,
The lock plate can swing while abutting at least two other restraining members and intersecting the shear line,
A locking mechanism characterized in that when unlocking, a surface of the lock plate substantially perpendicular to the advancing / retreating direction of the restraining member coincides with the shear line.   The locking mechanism according to claim 1, wherein the housing includes a spring urging unit that urges the lock plate toward the other restraining member that contacts the lock plate.   The locking mechanism according to claim 2, wherein the spring biasing means is a coil spring, and a contact member that contacts the lock plate is provided at a portion where the coil spring faces the lock plate. The restraining member comprises a plurality of under pins and a plurality of driver pins,
The rotating member has a keyhole extending along the rotation axis;
A plurality of underpin holes extending from the keyhole in a direction perpendicular to the rotation axis and penetrating the rotating member and slidably storing the underpin;
The housing includes a plurality of driver pin holes that extend so as to be able to communicate with the under pin holes in a direction perpendicular to the rotation axis and slidably accommodate the driver pins.
4. The device according to claim 1, wherein when unlocked, a boundary between the under pin and the driver pin coincides with the shear line, and at least two of the under pins abut against the lock plate. 5. Locking mechanism. The restraining member comprises a plurality of disks having insertion holes through which the keys are inserted,
The rotating member has a keyhole extending along the rotation axis;
A plurality of disk holes extending from the key hole in a direction perpendicular to the rotation axis and penetrating the rotation member and slidably storing the disk;
The disk can be moved back and forth in the accommodating space;
The side of the disc that intersects the direction perpendicular to the rotation axis of the disc coincides with the shear line when unlocked, and at least two discs abut against the lock plate. The locking mechanism according to any one of the above. The restraining member includes a plurality of cord pins and a plurality of under pins,
The rotating member includes a plurality of code pin holes extending in a direction parallel to the rotating shaft and penetrating the rotating member to slidably store the code pin.
The housing includes a keyhole extending in a direction parallel to a rotation axis of the rotating member;
A plurality of underpin holes that extend in a direction parallel to the rotation shaft so as to face the code pin holes and slidably accommodate the underpins,
A portion of the cord pin is exposed in the keyhole;
4. The device according to claim 1, wherein, when unlocked, a boundary between the cord pin and the under pin coincides with the shear line, and at least two of the cord pins abut against the lock plate. 5. Locking mechanism.

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