WO2014109113A1

WO2014109113A1 - Buckle with key lock

Info

Publication number: WO2014109113A1
Application number: PCT/JP2013/079494
Authority: WO
Inventors: 高橋　義信
Original assignee: Ykk株式会社
Priority date: 2013-01-11
Filing date: 2013-10-31
Publication date: 2014-07-17
Also published as: TW201503848A; CN104902774B; TWI524855B; JP6185720B2; CN104902774A; JP2014133032A

Abstract

A buckle (1) comprises: a plug (2) and a socket (3), which are provided so as to be capable of being fitted to each other and separated from each other; and a key (4) which is a separate body from both the plug (2) and the socket (3). The plug (2) is provided with an elastically deformable elastic engagement piece (24). The socket (3) is provided with an engagement protrusion (37) which engages with the elastic engagement piece (24). The key (4) is provided with a key-side pressing section (45) which is inserted into a key hole (36) provided in the socket (3). The elastic engagement piece (24) is provided with an engagement piece-side pressing section (28) which can be pressed only by the key-side pressing section (45). The elastic deformation of the elastic engagement piece (24), which occurs when the engagement piece-side pressing section (28) is pressed, releases the engagement between the elastic engagement piece (24) and the engagement protrusion (37).

Description

Buckle with key lock

The present invention relates to a buckle with a key lock, and more particularly to promotion of thinning of the buckle with a key lock and improvement of operability.

Conventionally, a center release type buckle with a key lock structure is known. In such a buckle, the socket is provided with a pressure release piece for releasing the engaged state with the plug, and a rotor functioning as an eccentric cam is rotatably attached to the pressure release piece. A locking cover is slidably attached to the socket so as to cover the pressing release piece and the rotor. Therefore, this buckle is comprised by five components which consist of a key for rotating a plug, a socket, a rotor, a locking cover, and a rotor (for example, patent document 1).

In the buckle described in Patent Document 1, the locking cover slides according to the amount of rotation of the rotor, and is positioned at a position where it can be pressed together with the pressure release piece or a position where it cannot be pressed. And according to this buckle, when the plug and the socket are engaged, when the key is inserted into the rotor through the key hole of the locking cover and the rotor is rotated by the key operation, the rotor functions as an eccentric cam. Then, the locking cover slides to a position where it cannot be pressed while covering the pressing release piece. For this reason, since the pressing release piece cannot be pressed by being covered with the locking cover, the engagement between the socket and the plug cannot be released, and the buckle is in the key lock state.

Conversely, when the key inserted into the rotor is further rotated or rotated back in the opposite direction, the lock cover slides to a position where it can be pressed, and the key lock of the buckle is released. Thereafter, by pressing the locking cover together with the pressing release piece, the engagement between the plug and the socket is released, and the plug can be removed from the socket.

Also, as a buckle with a lock, there is also known a lock tumbler that substitutes the functions of both the rotor and the locking cover described above. Therefore, this buckle is comprised by 4 components which consist of a key for rotating a plug, a socket, a tumbler, and a tumbler (for example, refer patent document 2).

In the buckle of Patent Document 2, the engagement with the socket is released by pressing the engagement portion with the socket provided on the plug. Then, when the plug and the socket are engaged, the tumbler is rotated using the key, and the lock arm provided on the tumbler is positioned between the engagement portion of the plug and the inner wall surface of the socket. The engagement portion is blocked by the lock arm and cannot be pressed, the engagement between the plug and the socket cannot be released, and the buckle is in the key lock state.

On the other hand, when the key is further rotated or returned in the reverse direction, the lock arm moves to a position displaced from the engaging portion of the plug, and the engaging portion can be pressed and the key lock is released. By pressing the engaging portion of the plug, the engagement between the plug and the socket is released, and the socket can be removed.

No. 7-46166 US Pat. No. 4,930,324

However, the buckles described in

Patent Documents

1 and 2 have many components, so there is a limit to making the entire buckle thinner. Further, since the tumbler of Patent Document 2 is a part that is unitized as a key cylinder, the size of the part is large, and the number of parts is small compared to the buckle of Patent Document 1, but the overall size of the buckle is increased. There is a problem of doing.

In addition, according to the buckles described in

Patent Documents

1 and 2, in order to key lock the buckle, it is necessary to perform key operation using the key after the plug is inserted into the socket and engaged. On the other hand, when the plug is removed from the socket, the key lock must be once released by a key operation, and then the engagement between the plug and the socket must be released. As described above, when the key operation at the time of key lock or release thereof is included, there is a problem that it takes time to insert and remove the plug and the socket.

An object of the present invention is to provide a buckle with a key lock that can be thinned and has good operability.

The buckle with a key lock of the present invention includes a plug and a socket that are detachably provided, and a key that is separate from the plug and the socket, and either the plug or the socket is elastically deformed. An elastic engagement piece is provided, and the other of the plug and the socket is provided with an engagement portion that engages with the elastic engagement piece, and the key is provided with the key provided in the socket. A key-side pressing portion to be inserted into the hole is provided, and the elastic engagement piece is provided with an engagement piece-side pressing portion that is pressed only by the key-side pressing portion, and the engagement piece-side pressing portion is pressed. The elastic engagement piece and the engagement portion are disengaged due to elastic deformation of the elastic engagement piece.

According to the present invention, since there are three parts of the buckle, which are a plug, a socket, and a key, conventional parts such as a rotor, a locking cover, or a tumbler can be eliminated, and a reduction in thickness can be promoted.
Further, the plug and the socket are brought into an engaged state by the engagement between the pressing engagement piece and the engaging portion, but there is no method other than using a key to release such an engaged state. It cannot be released by external operations other than. In other words, the engagement operation performed by inserting the plug into the socket becomes the key lock operation as it is, and the key operation at the time of key lock can be made unnecessary. In addition, since the unlocking by the key is the operation for releasing the engagement as it is, there is no need to perform an operation for releasing the engagement again after the unlocking. Thereby, the operability of the buckle can be significantly improved.

In the buckle with a key lock of the present invention, the key is a rotary type provided with an insertion portion inserted into the key hole, and the insertion portion includes a shaft portion provided with a rotation center, and the shaft. The key-side pressing portion that protrudes from the outer periphery of the portion toward both sides in the radial direction, and the engagement piece-side pressing portion has a pressing surface that the key-side pressing portion rides on as the key rotates. The key-side pressing portion is provided with an inclined surface that comes into contact with an edge of the engagement piece-side pressing portion when riding on the pressing surface.
According to the present invention, not only the key is inserted into the key hole, but also the lock and engagement are released only when the key is rotated. Therefore, even if an object other than the key is inserted into the key hole to be released, it is difficult to release. , Security can be improved.
Furthermore, when releasing by the key operation, the key is rotated to ride the key side pressing part onto the pressing surface of the engaging one side pressing part. The key side pressing part is provided with an inclined surface, and this inclination is provided. Since the surface comes into contact with the edge of the engaging one-side pressing portion, the key-side pressing portion can smoothly run on the pressing surface accompanying the rotation of the key, and the operability of the key can be improved.

In the buckle with a key lock according to the present invention, the pressing surface is inclined from the distal end side to the proximal end side of the elastic engagement piece so as to come into contact with the key side pressing portion as the key rotates. It is characterized by being.
According to the present invention, when the elastic engagement piece is provided on the plug side, the key-side pressing portion is elastically engaged with the rotation of the key because the pressing surface of the engagement piece-side pressing portion is inclined. In addition to simply pressing the pressing surface to deform the piece, it also presses in the plug removal direction, and in addition to unlocking and releasing the plug, pushes the plug a predetermined amount against the socket The subsequent plug removal operation can be facilitated.

In the buckle with a key lock of the present invention, the rotation center of the key is shifted from the center in the width direction of the plug and the socket to one side in the width direction, and the inclined surface of the key side pressing portion is The engagement piece side pressing portion is in contact with a position shifted from the rotation center of the key to the other side in the width direction.
The key-side pressing portion protrudes in the radial direction with respect to the shaft portion serving as the rotation center, and is offset from the rotation center. For this reason, if the center of rotation of the key coincides with the center of the plug and socket in the width direction, the contact position between the key-side pressing portion and the elastic engagement piece is displaced from the center in the width direction, and the elastic engagement There is a possibility that the piece cannot be elastically deformed uniformly.
Therefore, in the present invention, the center of rotation of the key is shifted from the center in the width direction, and the key-side pressing portion is brought into contact with the elastic engagement piece at a position closer to the center in the width direction. Uneven deformation of the joint piece can be prevented, and the engagement between the elastic engagement piece and the engagement portion can be more reliably released.

The disassembled perspective view of the buckle which shows one Embodiment of this invention. FIG. 2 is a cross-sectional view showing a state before engagement of a plug and a socket constituting a buckle, as seen from an arrow II-II in FIG. The top view of the partial cross section which shows the buckle of the state which engaged the plug with the socket. It is sectional drawing which shows the buckle of the state which engaged the plug with the socket, and is the arrow line view seen from arrow IV-IV of FIG. The 1st figure for demonstrating the movement of the plug accompanying the key operation at the time of lock release. The 2nd figure for demonstrating the movement of the plug accompanying the key operation at the time of lock release. Sectional drawing which shows the buckle of the state by which key operation was complete | finished and the lock | rock was cancelled | released. The disassembled perspective view which shows the modification of this invention. Sectional drawing which shows the other modification of this invention.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
1 and 2, the buckle 1 is a center release type having a lock mechanism, and includes a plug 2 and a socket 3 that are detachable from each other, and a key 4 that is inserted into the socket 3, each of which is a synthetic resin. Consists of three parts. In other words, although the buckle 1 includes the key 4, no conventional parts such as a rotor, a locking cover, or a tumbler are used, and the thickness can be further reduced by reducing the number of parts. ing.

The plug 2 includes a grip portion 21 having a flat front surface 21A and a back surface 21B. The grip portion 21 is provided with an opening 22A that penetrates the front surface 21A and the back surface 21B, and a belt winding rod 22B is provided in the opening 22A along the width direction of the plug 2. The belt mounting portion 22 is configured by the opening 22A and the belt winding rod 22B. On both sides in the width direction of the grip portion 21, a pair of

guide pieces

23, 23 extending toward the socket 3 to be inserted and removed are provided. Further, an elastic engagement piece 24 located between the pair of guide pieces 23 is extended from the grip portion 21. A slit 25 is provided between the guide piece 23 and the elastic engagement piece 24.

The back surface 23A of the guide piece 23 is provided with a groove portion 26 that is continuous along the extending direction of the guide piece 23 (the same as the insertion / extraction direction with the socket 3). The groove portion 26 is adapted to engage with a protrusion 54 (see FIG. 3) provided in the socket 3, thereby preventing the plug 2 from being inserted into the socket 3 with the front and back sides different.

On the other hand, the surface 24A of the elastic engagement piece 24 is provided with a rectangular engagement recess 27 in a plan view. The engaging recess 27 includes an inclined surface 27A that is inclined so that the depth of the concave portion becomes deeper toward the distal end side in the insertion direction, and an engaging portion 27B that connects the edge of the inclined surface 27A and the surface 24A. Prepare.

Further, the distal end side of the elastic engagement piece 24 is an engagement piece side pressing portion 28 slightly bent toward the back surface 24B side. The engaging piece side pressing portion 28 is provided with a pressing surface 28A that is recessed in a fan shape from the distal end edge to the proximal end side. Therefore, the thickness of the elastic engagement piece 24 on the front end side is thin at the portion corresponding to the pressing surface 28A, and a key-side pressing portion 45 described later can easily ride on. The pressing surface 28A is inclined in accordance with the bent shape of the engaging piece side pressing portion 28, and is elastic so that the contact resistance with the key side pressing portion 45 increases as the key 4 rotates. The joining piece 24 is inclined from the distal end side toward the proximal end side.

The socket 3 is configured as a hollow part including a front wall 31 and a back wall 32 provided at intervals in the front and back directions, and a side wall 33 covering the outer periphery thereof. In the socket 3, an opening 34 used for insertion / extraction is provided on the side where the plug 2 is inserted / extracted. A rectangular cutout opening 35A is provided on the opposite side of the socket 3 from the opening 34, and a belt winding rod 35B is provided in the cutout opening 35A along the width direction of the socket 3. The notch opening 35A and the belt winding rod 35B constitute a belt mounting portion 35 on the socket 3 side.

The front wall 31 is provided with a key hole 36 penetrating the front surface 31A and the back surface 31B. The shape of the key hole 36 may be appropriately determined according to the shape of the key 4. In the present embodiment, the key hole 36 includes a round hole portion 36 A and square hole portions 36 B provided on both sides in the radial direction. . Here, with the buckle 1, the engagement between the plug 2 and the socket 3 cannot be released except by performing a key operation. For this reason, the front wall 31 of the socket 3 is not opened except for the key hole 36, and is not provided with an opening or the like that can press the elastic engagement piece 24 of the socket 3 in the engaged state from the outside. .

Furthermore, on the back surface 31B of the front wall 31, an engagement convex portion 37 is provided as an engagement portion protruding downward. The engaging convex portion 37 has an outer shape that can be accommodated in the engaging concave portion 27 of the plug 2, and includes an inclined surface 37A that is inclined in the same direction as the inclined surface 27A of the engaging concave portion 27, and an edge of the inclined surface 37A. An engagement portion 37B on the socket 3 side that makes the back surface 31B continuous is provided.

The key 4 includes an annular knob 41, an insertion part 42 provided integrally with the knob 41 and inserted into the key hole 36 of the socket 3, and also provided integrally with the knob 41 and the insertion part 42. And an abutting portion 43 that abuts against the front wall 31 when the is inserted into the key hole. The insertion portion 42 of the key 4 protrudes toward both sides in the radial direction from the outer periphery of the shaft portion 44 and the cylindrical shaft portion 44 inserted into the round hole portion 36A of the key hole 36, and is inserted into the square hole portion 36B. And a pair of key-side pressing portions 45. The key 4 inserted into the key hole 36 can be rotated clockwise with the axis center of the shaft portion 44 as the rotation center O1 (see FIG. 4). However, the shape of the key 4 is not limited to this, and any shape can be adopted as long as the key 4 can be rotated to press the pressing surface 28 A of the plug 2.

Each key-side pressing portion 45 is provided with an inclined surface 45A (see also FIG. 4) inclined in the same direction in the circumferential direction. Specifically, the inclined surface 45A is inclined in such a direction that the key side pressing portion 45 is tapered toward the tip in the insertion direction, and the key side pressing portion 45 as a whole has a rotation center O1 (see FIG. 5 and FIG. 6). With such an inclination, the inclined surface 45A comes into contact with the edge of the engaging piece side pressing portion 28 at an acute angle on the pressing surface 28A side.

The state where the plug 2 is inserted into the socket 3 will be described in detail with reference to FIGS.
In the socket 3, two guide ribs 51 parallel to the insertion / extraction direction of the plug 2 are provided between the front wall 31 and the back wall 32. The guide rib 51 enters the slit 25 when the plug 2 is inserted. A space between the guide rib 51 and the side wall 33 facing the width direction is a guide piece housing portion 52 into which the guide piece 23 of the plug 2 enters. The space between the pair of guide ribs 51 is an engagement piece housing portion 53 into which the elastic engagement piece 24 enters.

In the guide piece housing portion 52, the inner surface 32 A of the back wall 32 is provided with a continuous ridge portion 54 along the insertion / extraction direction, and as described above, provided on the ridge portion 54 and the guide piece 23 of the plug 2. The grooved portion 26 is engaged. Moreover, in the engagement piece accommodating part 53, the engagement recessed part 27 of the plug 2 is accommodated in the engagement convex part 37 of the socket 3, and

mutual engagement parts

27B and 37B engage.

Here, when the plug 2 and the socket 3 are in an engaged state, a slight gap (backlash) is generated between them in the insertion / extraction direction. In the case where the play is clogged when the plug 2 enters most, the tip of the elastic engagement piece 24 of the plug 2 comes into contact with the contact portion 53A in the opposite engagement piece housing portion 53 (state of FIG. 3). . On the other hand, when the backlash is clogged because the plug 2 is located closest to the pulling side, the engaging

portions

27B and 37B are engaged with each other, and the plug 2 is maintained so as not to come out of the socket 3 ( The state of FIG.

Inside the socket 3, around the key hole 36, contact portions 55 are provided at positions corresponding to the respective square hole portions 36 B of the key hole 36. The abutting portion 55 is located on the side opposite to the inclined surface 45A of the key 4 to be inserted, and when the key 4 is accidentally turned counterclockwise, the abutting portion 55 abuts on the key side pressing portion 45 to enter the key. 4 does not rotate.

At this time, the back side (elastic engagement piece 24 side) of the contact portion 55 on the side close to the elastic engagement piece 24 of the plug 2 is a part of the contact portion 53A with which the elastic engagement piece 24 contacts. . For this reason, since the plug 2 and the key 4 are in contact with the

contact portions

53A and 55, a higher strength is required. Accordingly, in the present embodiment, the outer shape of the tip of the elastic engagement piece 24 is a left-right asymmetric irregular shape provided with the inclined edge 24C, and the thickness between the

contact portions

53A and 55 is sufficient to correspond to the irregular shape. By providing the size, the strength between the

contact portions

53A and 55 is secured.

The square hole portion 36B of the key hole 36 communicates with a passing space on a turning locus through which the key-side pressing portion 45 passes as the key 4 rotates in the clockwise direction. In one of the passage spaces, a pressing surface 28A provided on the engagement one-side pressing portion 28 of the plug 2 is located, and immediately after the key 4 starts to rotate, the one key-side pressing portion 45 is inclined. The surface 45A comes into contact with the front end edge of the engagement piece side pressing portion 28, and then rides on the pressing surface 28A to press and deform the elastic engagement piece 24. A part of the inner wall of the other space is a contact portion 56 with which the other key side pressing portion 45 of the key 4 contacts, and the rotation angle of the key 4 is defined as 90 °.

In the key hole 36, the center position O2 of the key hole 36 is coaxial with the rotation center O1 of the key 4, and the center position O2 is based on the center C1 in the width direction common to the plug 2 and the socket 3 as shown in FIG. It is shifted to the right inside. With this configuration, in this embodiment in which the key-side pressing portion 45 that contacts the engagement-side pressing portion 28 is provided on the left side in FIG. 3 with respect to the centers O1 and O2, the key 4 is rotated. In doing so, the contact between the key-side pressing portion 45 and the engagement piece-side pressing portion 28 can be started at a position close to the center C1. For this reason, when the elastic engagement piece 24 is pressed by the key-side pressing portion 45, the pressing force transmitted from the key-side pressing portion 45 acts near the center C1 in the width direction of the elastic engagement piece 24. It is possible to prevent the engagement piece 24 from being greatly displaced from the center C1, and the engagement state is released and the plug is pushed out reliably.

However, actually, the contact position between the key-side pressing portion 45 and the elastic engagement piece 24 is slightly shifted to the left in FIG. 3 from the center C1. Therefore, in this embodiment in which the elastic engagement piece 24 is pressed by the key-side pressing portion 45 immediately after the key 4 is rotated, there is a possibility that the deformation state of the elastic engagement piece 24 is biased. That is, it is conceivable that the elastic deformation on the side opposite to the centers O1 and O2 across the center C1 is somewhat increased.

Therefore, in the present embodiment, the engagement concave portion 27 of the plug 2 and the engagement convex portion 37 of the socket 3 are provided such that the center C2 in the width direction is shifted to the left with respect to the entire center C1. Even when the elastic engagement piece 24 is biased and elastically deformed, the engagement state of the engagement recess 287 and the engagement protrusion 37 is more reliably released.

Hereinafter, the operation of the buckle 1 will be described with reference to FIGS.
First, as shown in FIG. 4, when the plug 2 is inserted into the socket 3, the elastic engagement piece 24 of the plug 2 comes into contact with the engagement convex portion 37 of the socket 3 as it is inserted, and the elastic engagement piece 24 is shown in the figure. It passes through the engaging projection 37 while being pressed downward. When the engaging portion 27B of the engaging concave portion 27 provided in the elastic engaging piece 24 passes the engaging portion 37B of the engaging convex portion 37, the elastic deformation of the elastic engaging piece 24 is restored, and the engaging

portion

27B and 37B engage with each other. This state is a state where the plug 2 and the socket 3 are engaged.

In this engaged state, the elastic engagement piece 24 cannot be pressed from the outside by manual operation or the like, so that the engagement between the plug 2 and the socket 3 cannot be released, and the plug 2 is removed from the socket 3. I can't. That is, when the plug 2 and the socket 3 are in the engaged state, the plug 2 is key-locked with respect to the socket 3, and the key lock operation using the key 4 is not necessary after the engagement.

Next, when the lock is released, the engagement is released, and the plug 2 is removed from the socket 3, the key 4 is inserted into the key hole 36 as shown in FIG. 4, and the key 4 is inserted as shown in FIG. Rotate clockwise. In this way, the inclined surface 45A provided on the key-side pressing portion 45 immediately after the rotation contacts the tip edge of the engaging piece-side pressing portion 28, rides on the pressing surface 28A, and presses the elastic engaging piece 24 downward. To do. The pressed elastic engagement piece 24 is elastically deformed, and the engagement concave portion 27 is detached from the engagement convex portion 37 at a relatively early stage of the rotation operation of the key 4 so that the mutual engagement is released.

Furthermore, as shown in FIG. 6, when the rotation operation of the key 4 is advanced to a predetermined angle, the elastic engagement piece 24 abuts against the back wall 32 of the socket 3 until the predetermined angle is reached, and the elastic engagement piece 24 is elastic. The deformation is stopped (FIG. 7). On the other hand, as the key 4 rotates, the key side pressing portion 45 and the inclined pressing surface 28A of the plug 2 still rub against each other, so that the pressing surface 28A has a plug as shown by a white arrow in the figure. A pressing force in the direction of pushing out 2 acts.

As a result, the plug 2 is pushed out to a predetermined position where it can be easily grasped as shown in FIG. Thereafter, the plug 2 is extracted. Thus, by inserting and rotating the key 4, not only the lock state of the plug 2 and the socket 3 is released, but also the mutual engagement state is released, and the plug 2 is pushed out by a predetermined amount. Operation is performed.

According to the above embodiment, the following effects can be obtained.
That is, since the buckle 1 is composed of three parts, that is, a plug 2, a socket 3, and a key 4, parts such as a conventional rotor, a locking cover, or a tumbler can be dispensed with, and a reduction in thickness can be promoted.

In the buckle 1, since the engaging operation performed by inserting the plug 2 into the socket 3 becomes the locking operation as it is, the key operation at the time of locking can be made unnecessary. Further, since the unlocking by the key 4 is the operation of releasing the engagement as it is, there is no need to perform an operation for releasing the engagement again after the unlocking. Thereby, the operability of the buckle 1 can be remarkably improved.

In the buckle 1, not only the key 4 is inserted into the key hole 36, but also the lock and engagement are released only after the key 4 is rotated. It can be difficult and security can be improved.

Further, when releasing by key operation, it is necessary to ride the key side pressing portion 45 of the key 4 on the engagement one side pressing portion 28. The key side pressing portion 45 is provided with an inclined surface 45A. Since 45A is in contact with the edge of the engagement one-side pressing portion 28, the key-side pressing portion 45 can smoothly run on the pressing surface 28A accompanying the rotation of the key 4, and the operability of the key 4 can be improved. it can.

In the buckle 1, since the pressing surface 28 A of the engagement piece side pressing portion 28 is inclined, the key side pressing portion 45 causes the elastic engagement piece 24 to be deformed as the key 4 rotates. In addition to unlocking and disengaging the plug 2, the plug 2 can be pushed out to the socket 3 by a predetermined amount. Subsequent extraction operation of the plug 2 can be facilitated.

In the buckle 1, the rotation center O 1 of the key 4 is shifted from the center C 1 in the width direction of the plug 2 and the socket 3, and the key side pressing portion 45 contacts the elastic engagement piece 24 at a position near the center C 1. Thus, the biased deformation of the elastic engagement piece 24 can be prevented, and the engagement between the engagement concave portion 27 on the plug 2 side and the engagement convex portion 37 on the socket 3 side can be more reliably released.

In addition, this invention is not limited to the said embodiment, The modification in the range which can achieve the objective of this invention is contained in this invention.
For example, in the above-described embodiment, the key 4 is a rotary type, but as shown in FIG. 8, it may be a plug-in type having a pair of key-side pressing portions 45. In this case, the key-side pressing portion 45 is provided with an inclined surface 45A so as to face the plug 2 side in the inserted state. As a structure on the socket 3 side, a key hole 36 is constituted by a pair of square hole portions 36B, and a key side pressing portion 45 is inserted into these square hole portions 36B. On the plug 2 side, the elastic engagement piece 24 is divided into left and right first and

second engagement pieces

241 and 242, and the engagement concave portion 27 and the pressing surface 28 A are also provided on the left and right first and second concave portions 271, respectively. 272 and first and second

pressing surfaces

281A and 282A. However, the engagement protrusion 37 of the socket 3 and the pressing surface 28A of the plug 2 are provided corresponding to the entire width direction of the elastic engagement piece 24. Other configurations are substantially the same as those in the above embodiment.

In such a modification, by inserting the key 4, the first and second engaging

pieces

241 and 242 are pressed by the inclined surface 45 A, and the first and second recessed

portions

271 and 272 and the engaging protruding portion 37 are pressed. The plug 2 is moved to the extraction side by a predetermined amount by the action of the inclined surface 45A and the first and second

pressing surfaces

281A and 282A. And in this modification, by having the 1st, 2nd engagement piece 241,242, unless these two sheets are pressed simultaneously, an engagement state is not cancelled | released, inserting the front-end | tip of a writing instrument etc., and inserting only one side. Security is high because it cannot be released by pressing. Moreover, since the opening area of the square hole part 36B can be made small to such an extent that the key side pressing part 45 can be inserted, insertion of such a writing instrument itself can be made difficult. The security engagement may be further improved by dividing the elastic engagement piece 24 into three or more parts so that the elastic engagement pieces 24 cannot be released unless they are pressed simultaneously.

In the above embodiment, the elastic engagement piece 24 is provided on the plug side. However, as shown in FIG. 9, such an elastic engagement piece 137 is provided on the socket 3 side, and the elastic engagement piece 137 is provided on the plug 2 side. An engaging portion 127 that engages with the combined piece 137 may be provided. In such a configuration, a pair of engaging pieces 124 on the plug 2 side having the engaging portion 127 are arranged in parallel (only one is shown in FIG. 9), and a key is inserted between them.

In the embodiment described above, the key 2 and the socket 3 can be released from the key lock and engagement by rotating the key 4, and the plug 2 is pushed out by a predetermined amount. Depending on the setting of the tilt angle, the lock and the engagement state may be simply released. For example, in the above-described embodiment, the pressing surface 28A is inclined. However, such an inclination is eliminated or the inclination direction is changed. In a configuration such as the modification shown in FIG. By eliminating the inclination of the inclined surface 45A of the portion 45 and the pressing surface 28A of the plug 2, the plug 2 is not pushed out. In such a configuration, the plug 2 whose key lock and engagement are released is manually pulled out from the beginning.

In the above-described embodiment, the rotation angle of the key 4 is defined as 90 °. However, even when the key 4 is configured to be rotatable by 360 °, for example, it is included in the present invention. How many times to define the rotation angle may be arbitrarily determined in the implementation.

The present invention relates to a buckle that prevents an opening lid from being easily opened when a packaging box for storing articles, an opening lid of a bag, or the like is closed using a belt and a buckle. Is preferably used.

DESCRIPTION OF SYMBOLS 1 ... Buckle, 2 ... Plug, 3 ... Socket, 4 ... Key, 24, 137 ... Elastic engagement piece, 28 ... Engagement piece side press part, 36 ... Key hole, 37 ... Engagement convex part which is an engagement part, 42 ... Insertion part, 44 ... Shaft part, 45 ... Key side pressing part, 45A ... Inclined surface, 28A ... Pressing surface, 127 ... Engagement part, C1 ... Center, O1 ... Center of rotation.

Claims

A plug (2) and a socket (3), which are detachably provided,
The plug (2) and the socket (3) consist of a separate key (4),
One of the plug (2) and the socket (3) is provided with an elastically deformable elastic engagement piece (24, 137),
The other of the plug (2) and the socket (3) is provided with an engagement portion (37, 127) that engages with the elastic engagement piece (24, 137),
The key (4) is provided with a key side pressing portion (45) to be inserted into a key hole (36) provided in the socket (3),
The elastic engagement piece (24, 137) is provided with an engagement piece side pressing portion (28) that is pressed only by the key side pressing portion (45).
The elastic engagement pieces (24, 137) and the engagement portions (37, 127) are formed by elastic deformation of the elastic engagement pieces (24, 137) when the engagement piece side pressing portion (28) is pressed. ) And the key lock buckle.
The buckle with a key lock according to claim 1,
The key (4) is a rotary type provided with an insertion portion (42) to be inserted into the key hole (36),
The insertion portion (42) includes a shaft portion (44) provided with a rotation center (O1), and the key side pressing portion (projected toward the both sides in the radial direction from the outer periphery of the shaft portion (44)). 45), and
The engagement piece side pressing portion (28) is provided with a pressing surface (28A) on which the key side pressing portion (45) rides as the key (4) rotates.
The key-side pressing portion (45) is provided with an inclined surface (45A) that comes into contact with an edge of the engagement piece-side pressing portion (28) when riding on the pressing surface (28A). Buckle with lock.
The buckle with a key lock according to claim 2,
The pressing surface (28A) is directed from the distal end side to the proximal end side of the elastic engagement piece (24) so as to come into contact with the key side pressing portion (45) as the key (4) rotates. Buckle with key lock, characterized by inclination.
In the buckle with a key lock according to claim 2 or claim 3,
The rotation center (O1) of the key (4) is shifted from the center (C1) in the width direction of the plug (2) and the socket (3) to one side in the width direction,
The inclined surface (45A) of the key side pressing portion (45) is shifted from the rotation center (O1) of the key (4) to the other side in the width direction, and the engagement piece side pressing portion (28). A buckle with a key lock, characterized by contact with