JP3040979U - Lock bracket - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To provide a highly convenient lock receiving member that can open a door without rotating a lever or a knob when locking is not required. SOLUTION: A strike box 20 into which the latch bolt is inserted by a protrusion of a latch bolt built into a lock body, and a strike 10 provided on the surface of the strike box 20 to engage and lock the latch bolt. Equipped with. A shield plate 31 for prohibiting the insertion of the latch bolt is provided in the strike box 20 so as to be switchable between a prohibited state and a released state for releasing the prohibition.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 According to the present invention, a locking box is provided by engaging a protrusion of an engaging member incorporated in a lock body with a strike box into which the engaging member is inserted, and engaging the engaging member provided on the surface of the strike box to lock the door. It relates to a lock bracket having a strike.

[0002]

[Prior art]

 Conventionally, doors equipped with locks have been used for general entrances and partitions in buildings and rooms such as warehouses, laboratories, and hospitals.

This type of lock is composed of, for example, a lock main body containing a dead bolt, a latch bolt, or a sickle metal, and a receiving metal fitting having a strike provided at a position facing the lock main body.

Then, by closing the door, the latch bolt is engaged with the strike and locked automatically by, for example, the protrusion of the latch bolt, while the knob or the lever is rotated to unlock the door. The door can be opened.

[0005]

[Problems to be solved by the device]

 By the way, it is not always good for the door to be locked when it is closed. For example, in a laboratory, hospital, warehouse, etc., when carrying laboratory equipment, medical equipment, products, etc. with both hands, move the door with your body etc. without operating the knobs and levers provided on the door. It is desirable that it can be opened by pushing.

However, in the above-mentioned conventional lock, when the lock is performed by the dead bolt as well as when the lock is automatically performed by the latch bolt, the lever, the knob, and the like must be manually operated to rotate. Without it, it has the problem that the door cannot be opened.

On the other hand, even if the door can be freely opened, it is required to be locked at night for safety reasons.

The present invention has been made in view of the above-mentioned conventional problems, and an object thereof is to provide a high convenience that a door can be opened without rotating a lever or a knob when locking is not necessary. It is to provide a lock bracket.

[0009]

[Means for Solving the Problems]

 In order to solve the above-mentioned problems, the lock bracket of the invention according to claim 1 is a strike box into which the engaging member is inserted by the protrusion of the engaging member housed in the lock body, and the strike box. In a metal fitting of a lock provided on the surface of the lock and having a strike for locking the door by engaging the engaging member, a prohibiting means for prohibiting the insertion of the engaging member is prohibited in the strike box. It is characterized by being provided so that it can be switched between a state and a release state in which the prohibition is released.

According to the above-mentioned invention, the prohibiting means is switched to the prohibiting state when the locking is not necessary. As a result, the prohibiting means is set in the prohibition state to prohibit the engagement member incorporated in the lock body from being inserted into the strike box through the strike.

As a result, even when the door is closed, the engagement member cannot be engaged with the strike, so that it cannot be locked. Therefore, the door can be opened by pressing the door without rotating the lever or knob. Therefore, for example, even when the user holds an object and both hands are closed, it is possible to easily push the door open with the body or the like.

On the other hand, when it is necessary to lock the lock, the prohibiting means is switched to a release state for releasing the prohibition. As a result, the prohibiting means is released, and the engaging member can enter the strike box through the strike. As a result, when it is necessary to lock the door, it can be locked as usual when the door is closed.

Further, the prohibition state and the release state in the prohibition means can be easily changed by switching at any time. Therefore, it is possible to provide a highly convenient lock receiving fitting that can open the door without rotating the lever or the knob when the lock is not required.

In order to solve the above-mentioned problems, the lock bracket of the invention according to claim 2 is the lock bracket of claim 1, wherein the prohibition means is such that the inside of the strike box is from the front side. It consists of a shield plate that is movable toward the bottom side and a biasing member that biases this shield plate toward the front side within the strike box. It is fixed at the position where it is locked on the back of the strike, and is formed so that the shield plate is at the fixed position where it is locked at the bottom of the strike box while resisting the bias of the biasing member in the above-mentioned released state. It is characterized by being.

According to the above invention, when the prohibiting means is in the prohibiting state, the shield plate biased to the front side by the biasing member is fixed at the position locked to the back surface of the strike. Therefore, the shield plate blocks the strike, and the engagement member built into the lock body is prohibited from being inserted into the strike box through the strike. As a result, even if the door is closed, it will not be locked.

On the other hand, when the prohibiting means is released, as a switching operation, for example, a driver or the like presses the shielding plate so that the shielding plate in the prohibited state resists the bias of the biasing member. Move to the bottom of the strike box with and lock it at that position to set it in the fixed position. This allows the engagement member to easily enter the strike box through the strike. Therefore, it can be locked as usual.

Further, when the shield plate is brought into the prohibited state again from the released state, the lock of the shield plate at the inner bottom of the strike box is released so that the shield plate can be easily moved by the biasing force of the biasing member. It can be returned to its original fixed position.

As a result, when it is not necessary to lock the lock, it is possible to provide a highly convenient lock receiving metal fitting that can surely open the door without rotating the lever or the knob. In this case, the structure is easy, the operability is good, the cost is low, and the appearance is good.

In order to solve the above problems, in the lock bracket of the invention according to claim 3, in the lock bracket of claim 2, the above-mentioned prohibition means is a strike box at the bottom of the strike box. Has a locking opening formed in the side wall of the strike box, and in the unlocked state, the shielding plate is rotated at the bottom of the strike box to lock the shielding plate in the locking opening and strike box. It is characterized in that it further comprises a locking means for preventing the movement to the front surface side of the above and locking the rotation at the locking opening of the above-mentioned shield plate.

According to the above invention, the prohibiting means has the locking opening formed in the side wall of the strike box at the bottom of the strike box. Therefore, in the release state, by rotating the shield plate at the bottom of the strike box, the shield plate is locked in the locking opening and prevented from moving to the surface side of the strike box. You can

Here, in this released state, the shield plate is locked by the locking means so as to be locked in rotation at its locking opening. Therefore, for example, even if the receiving bracket is vibrated when the door is closed, the shielding plate slides and rotates in the locking opening, and the locking of the shielding plate in the locking opening is released. I don't know.

As a result, in the released state, the shielding plate can be securely locked in the locking opening, and the released state can be maintained forever.

[0023]

[Embodiment of the invention]

 An embodiment of the present invention will be described below with reference to FIGS. 1 to 8.

The lock 1 to which the receiving metal fitting of the present embodiment is applied is, as shown in FIGS. 2 (a) and 2 (b), a lock main body 3 attached to a door 2 and, as shown in FIG. It is composed of a receiving metal fitting 4 which is provided at two opposing positions and is carved in a door frame, for example, not shown.

In the present embodiment, a single-open door is taken as the door 2 for explanation, and therefore the receiving fitting 4 is provided on the door frame, but the present invention is not limited to this, and for example, the door 2 can be used as both doors. When the door is opened, the bracket 4 can be attached to the other opposite door 2. Further, the door 2 is not necessarily limited to a hinged door, and may be a sliding door, for example.

Next, the lock body 3 of the present embodiment incorporates, for example, a latch bolt 5 as an engaging member protruding from the door 2. The engaging member is not limited to this, and the protruding member may be, for example, a dead bolt or a sickle metal.

The receiving bracket 4 will be described below. As shown in FIG. 3, the receiving metal fitting 4 of the present embodiment has a strike 10 and a strike box 20 in this order from the front surface side, like a general receiving metal fitting.

As shown in FIGS. 4 (a) and 4 (b), the strike 10 has an engaging opening 11 at the center, and engages with the latch bolt 5 protruding from the lock body 3 to cause the above-mentioned engagement. The lock 1 can be locked. Further, a latch sliding portion 12 is formed on the side surface of the strike 10 in order to prevent scratches and the like due to contact of the tip of the latch bolt 5 with the door frame when the door 2 is opened and closed. The strike 10 is not limited to this, and may be the strike 10 without the latch sliding portion 12.

On the other hand, as shown in FIG. 3, a shield plate 31 is provided inside the strike box 20 so as to be movable in the strike box 20 from the front surface side to the inner bottom side, and the shield plate 31. A coil-shaped spring 32 as an urging member for urging the above in the strike box 20 is housed.

When it is not necessary to lock the shielding plate 31, the spring 32 urges the shield plate 31 toward the surface of the strike box 20 in order to prevent the latch bolt 5 in the lock 1 from entering the strike box 20. The strike 10 is fixed at the position where it is locked on the back surface of the strike 10.

On the other hand, the shield plate 31 is formed so as to be in a fixed position where it is locked to the inner bottom portion of the strike box 20 against the bias of the spring 32 when it needs to be locked.

The structure of the shielding plate 31, the spring 32, and the strike box 20 as the above-mentioned prohibiting means will be described in detail. First, as shown in FIGS. 5 (a), 5 (b) and 5 (c), the shielding plate 31 has a substantially rectangular plate shape, and upper and lower ends thereof are stepped portions 31a and 31a having a slight step. ing. These step portions 31a, 31a have a depth substantially the same as the thickness of the strike 10. Further, in the shielding plate 31, the central plate portion 31b projecting to the front side in relation to the step portions 31a, 31a is formed in a rectangular shape and a size that can be loosely fitted in the engagement opening 11 of the strike 10. ing.

As shown in FIG. 5 (c), the central portion of the central plate portion 31 b has a circular recess 31 c, which can be inscribed in the spring 32 to fix the spring 32. It has become a thing.

Further, a + -shaped turning hole 31d is formed in the recess 31c so that the shielding plate 31 can be turned about the turning hole 31d by a Phillips driver (not shown). Has become.

Further, recesses 31e and 31e serving as locking means are provided on the upper right side and the lower left side of the shield plate 31 shown in FIG. 1B, respectively, to engage with the inner bottom of the strike box 20. In order to ensure the matching, a projection 25, which will be described later, can be inserted as a locking means of the strike box 20.

As shown in FIG. 3, the spring 32 has a coil shape and prohibits the latch bolt 5 from projecting into the strike box 20 when the door 2 is closed. Therefore, a sufficient biasing force is applied to the shield plate 31, while when the lock is not required, the shield plate 31 is pushed manually against the biasing force to push the shield plate 31 in the back of the strike box 20. It provides a biasing force that can be moved to the bottom.

The above-mentioned spring 32 is not necessarily limited to this. For example, the spring 32 can be configured by a leaf spring, and can also be configured by another urging member having elasticity. is there.

As shown in FIGS. 3 and 6A, 6B, and 6C, the above-mentioned strike box 20 has a rectangular parallelepiped box-shaped accommodating portion 21 for accommodating the latch bolt 5 that is projected and moved. ing.

The housing 21 is provided with the shielding plate 31 so as to be movable from the surface side of the strike box 20 to the inner bottom. Therefore, the inner dimension of the housing portion 21 is slightly larger than the outer dimension of the shield plate 31.

As shown in FIG. 6A, the right inner wall of the housing portion 21 is a thick wall whose upper and lower sides project inward, and the inner wall of the right inner wall on the upper side is further projected. As shown in FIG. 6B, a locking opening 22 is formed in the bottom.

On the other hand, as shown in FIG. 6A, the upper and lower sides of the right inner wall of the accommodation portion 21 are largely projected inward, whereas the left inner wall of the accommodation portion 21 is upward and downward. The side projects slightly inward. A locking opening 23 is formed in the lower inner bottom of the left inner wall.

That is, when the shield plate 31 is rotated around the rotation hole 31d at the bottom of the strike box 20, the lock plate 22 and the lock apertures 22 and 23 of the strike box 20 are provided. The shield plate 31 is rotatable by projecting from the right inner wall and the left inner wall.

In the present embodiment, the locking openings 22 and 23 are opened in both the right inner wall and the left inner wall of the housing portion 21, but the invention is not limited to this, and, for example, the engagement of the right inner wall. Only the stop opening 22 may be provided. However, it is more preferable to provide both of the locking openings 22 and 23 because the shield plate 31 can be held in the left-right balance with a good balance and can be held in the released state described later.

As shown in FIGS. 6 (a) and 6 (b), a small protrusion 2 is formed on the bottom surface 24 on the upper side of the right inner wall of the housing portion 21, that is, on the plane including the surface side edge of the locking opening portion 22. 5 is formed. The projection 25 is rotated around the shield plate 31 centering on the rotation hole 31d, the end of the shield plate 31 is locked to the bottom surface 24, and the movement of the cover 21 to the surface is blocked. In this case, the locking plate 31 is fitted in the recess 31e of the shield plate 31 so that the locking does not easily come off due to vibration or the like.

Further, as shown in FIGS. 6 (a) and 6 (c), an annular protrusion 26 is formed at the bottom of the accommodation portion 21, and the annular protrusion 26 is inscribed in the spring 32 and is in contact with the spring 3. 2 can be locked. That is, the spring 32 has, for example, a truncated cone shape.

The operation of the bracket 4 having the above structure will be described. First, the receiving bracket 4 is provided on the door 2 when it is not necessary to lock it, for example, when a laboratory instrument, a medical instrument, a product, or the like is moved with both hands in a laboratory, a hospital, a warehouse, or the like. It is possible to open the door 2 by pushing the door 2 with the body or the like without operating the knobs and levers. In this case, as a prohibited state for prohibiting the protrusion of the latch bolt 5, as shown in FIGS. 7 (a), (b) and FIG. 1 (a), the shield plate urged to the front side in the strike box 20. 31 is fixed at a position locked on the back surface of the strike 10.

As a result, the spring 32 urges the shield plate 31 toward the front side with a larger urging force than the protrusion force of the latch bolt 5, so that the latch bolt 5 remains inside the strike box 20 even when the door 2 is closed. It is not possible to move forward and to be engaged with the strike 10. As a result, since the lock 1 is not locked, as described above, the door 2 can be opened by pushing the door 2 with the body or the like.

On the other hand, in order to enable locking from the prohibition state in which the protrusion of the latch bolt 5 is prohibited, a plus driver (not shown) is provided in the + -shaped rotation hole 31d formed in the center of the shield plate 31. Abut and press to move the shield plate 31 to the deep part of the strike box 20 as shown in FIG. 8 (b), and then as shown in FIG. 8 (a) and FIG. 1 (b). , The shield plate 31 is rotated clockwise by the above Phillips driver. As a result, the upper right end of the shield plate 31 is projected from the locking opening 22 of the right inner wall of the accommodating portion 21 and is formed on the bottom surface 24 of the right inner wall by slightly weakening the pressing force of the shield plate 31. The concave portion 31e of the shielding plate 31 is fitted into the protruding projection 25.

As a result, the shielding plate 31 is in a state in which its movement toward the surface is locked by the bottom surface 24, and the easy rotation of the shielding plate 31 is prevented by the engagement of the recess 31e and the protrusion. To be done.

At the same time, the lower left portion of the shielding plate 31 projects into the locking opening 23 formed in the inner bottom of the lower left inner wall of the strike box 20, and is inserted into the locking opening 23. Are locked.

As a result, when the door 2 is closed, the latch bolt 5 is projected and moved as usual, whereby the lock 1 is locked. That is, this state is the released state in which the above-mentioned prohibited state is released.

As described above, in the receiving metal fitting 4 of the lock 1 of the present embodiment, the shielding plate 31 is switched to the prohibited state when it is not necessary to lock it. As a result, the shield plate 31 is prohibited, and the latch bolt 5 built in the lock body 3 is prohibited from being inserted into the strike box 20 through the strike 10.

As a result, even when the door 2 is closed, the latch bolt 5 cannot be engaged with the strike 10, so that it cannot be locked. Therefore, the door 2 can be opened by pressing the door 2 without rotating the lever or knob. Therefore, for example, even when the user holds an object and both hands are closed, it is possible to easily open the door 2 by pushing the door 2 with the body or the like.

On the other hand, when it is necessary to lock the screen, the shield plate 31 is switched to a release state in which the prohibition is released. As a result, the shield plate 31 is released, and the latch bolt 5 can enter the strike box 20 through the strike 10. As a result, when the door 2 needs to be locked, it can be locked as usual when the door 2 is closed.

Further, the prohibition state and the release state of the shielding plate 31 can be easily changed at any time by switching. Therefore, when there is no need for locking, it is possible to provide the highly convenient receiving bracket 4 for the lock 1 that can open the door 2 without rotating the lever or knob.

Further, in the receiving member 4 of the lock 1 of the present embodiment, when the shield plate 31 is in the prohibited state, the shield plate 31 urged to the front side by the spring 32 is attached to the back surface of the strike 10. It is fixed at the position locked by. Therefore, the shield plate 31 blocks the strike 10, and the latch bolt 5 built in the lock body 3 is prohibited from entering the strike box 20 through the strike 10. As a result, even if the door 2 is closed, it will not be locked.

On the other hand, when the shielding plate 31 is released, as a switching operation, for example, a driver or the like presses the shielding plate 31 so that the shielding plate 31 in the prohibited state is urged by the spring 32. It is moved to the inner bottom portion of the strike box 20 in a resisting state, and is locked to the fixed position by the bottom surface 24 of the right inner wall of the inner bottom portion of the strike box 20. As a result, the latch bolt 5 can easily enter the strike box 20 through the strike 10. Therefore, it can be locked as usual.

Further, when the shielding plate 31 is brought into the prohibited state again from this released state, the biasing force of the spring 32 is released by releasing the locking of the shielding plate 31 on the bottom surface 24 at the inner bottom portion of the strike box 20. Thus, the shield plate 31 can be easily returned to the original fixed position in the prohibited state.

As a result, it is possible to provide the highly convenient receiving bracket 4 for the lock 1 that can surely push and open the door 2 without rotating the lever or the knob when the locking is not necessary. In embodying the prohibition means, the structure can be made easy, the operability is good, the cost is low, and the appearance is good.

When embodying the prohibition means, a conventional product is used for the lock main body 3 and such a function can be provided by replacing only the bracket 4, so that the versatility and compatibility are improved. Can be high.

Further, the receiving metal fitting 4 of the lock 1 of the present embodiment has locking openings 22 and 23 formed in the side wall of the strike box 20 at the bottom of the strike box 20. Therefore, in the released state, the shield plate 31 is rotated at the inner bottom portion of the strike box 20 so that the shield plate 31 is engaged with the engagement openings 22 and 23 to the front surface side of the strike box 20. Can prevent movement.

Further, in this released state, the shield plate 31 is rotated by the recesses 31e formed in the shield plate 31 and the projection 25 formed on the bottom surface 24 in the locking openings 22 and 23. Locked. That is, the recess 31e of the shield plate 31 is locked in a state of being fitted into the protrusion 25 of the bottom surface 24.

Therefore, for example, even when the receiving fitting 4 receives vibration when the door 2 is opened and closed, the shield plate 31 slides and rotates in the engagement openings 22 and 23 to engage the shield plate 31. The locking at the openings 22 and 23 does not come off.

As a result, in the released state, the shielding plate 31 can be reliably locked to the locking openings 22 and 23, and the released state can be maintained forever.

[0065]

[Effect of the invention]

 As described above, in the lock bracket of the invention according to claim 1, the prohibition means for prohibiting the insertion of the engaging member in the strike box is switched between the prohibition state and the release state for releasing the prohibition. It is provided as possible.

Therefore, when it is not necessary to lock the lock, the prohibition means is switched to the prohibition state to prohibit the engagement member incorporated in the lock body from being inserted into the strike box through the strike.

As a result, even when the door is closed, for example, even when the user is holding an object and both hands are closed, it is possible to easily open the door by pushing with the body or the like.

On the other hand, when locking is required, the engaging member can enter the strike box through the strike by switching the prohibiting means to the release state for releasing the prohibition, and when the door is closed, the normal condition is generated. You can lock the street.

Further, the prohibition state and the release state in the prohibition means can be easily changed at any time by switching. Therefore, when there is no need for locking, there is an effect that it is possible to provide a highly convenient lock receiving fitting that can open the door without rotating the lever or knob.

As described above, the lock fitting of the invention according to claim 2 is the lock receiving tool according to claim 1, wherein the prohibiting means moves the inside of the strike box from the front side to the bottom side. It consists of a movable shield plate and an urging member that urges this shield plate toward the front side within the strike box. The shield plate is fixed to the locked position, and the shield plate is formed in a fixed position where it is locked to the bottom of the strike box in the released state against the bias of the biasing member. It is a thing.

Therefore, when the prohibiting means is in the prohibition state, the shield plate biased to the front side by the biasing member is fixed at the position locked to the back surface of the strike, and the shield plate strikes. Since it is closed, it will not be locked even if the door is closed.

On the other hand, when the prohibiting means is released, as the switching operation, the shielding plate in the prohibited state is moved to the bottom of the strike box against the bias of the biasing member, and its position is changed. To lock it in the fixed position. As a result, it can be locked as usual.

Further, when the shield plate is brought into the prohibited state again from the released state, the lock of the shield plate at the inner bottom of the strike box is released so that the shield plate can be easily moved by the biasing force of the biasing member. It can be returned to its original fixed position.

As a result, when it is not necessary to lock the lock, it is possible to provide a highly convenient lock receiving metal fitting that can surely open the door without rotating the lever or the knob. In this case, the configuration is easy, the operability is good, the cost is low, and the appearance is good.

As described above, the lock fitting of the invention according to claim 3 is the lock receiving tool according to claim 2, wherein the prohibiting means is provided on the side wall of the strike box at the bottom of the strike box. With the lock opening formed, the shield plate is rotated at the bottom of the strike box in the released state to lock the shield plate in the lock opening and the front side of the strike box. It further comprises locking means for preventing the movement of the lock plate from moving to the above position and for locking the rotation at the locking opening of the above-mentioned shielding plate.

Therefore, in the released state, by rotating the shield plate at the bottom of the strike box, the shield plate is locked in the locking opening and moved to the front side of the strike box. Can be stopped.

Further, in the released state, the shielding plate is locked by the locking means in the rotation at the locking opening. Therefore, even if the receiving bracket is vibrated when the door is closed, the shielding plate slides and rotates in the locking opening, and the locking of the shielding plate in the locking opening is released. Absent.

As a result, in the released state, the shielding plate is reliably locked in the locking opening, and at the same time, the released state can be maintained.

[Brief description of the drawings]

FIG. 1 shows a lock bracket according to an embodiment of the present invention, (a) is a perspective view showing a state in which a shield plate is in a prohibited state, and (b) is a shield plate. It is a perspective view which shows the state which is in a cancellation | release state.

2A and 2B show a lock body of the lock, in which FIG. 2A is a front view and FIG. 2B is a right side view.

FIG. 3 is an exploded perspective view showing a metal fitting of the lock.

FIG. 4 shows a strike of the above-mentioned receiving bracket,
(A) is a front view, (b) is a bottom view.

FIG. 5 is a view showing a shield plate of the receiving bracket, (a)
Is a plan view showing a part in section, (b) is a front view, (c)
Is a sectional view.

6A and 6B are views showing a strike box of the receiving metal fitting, where FIG. 6A is a front view, FIG. 6B is a side view, and FIG. 6C is a sectional view.

7A and 7B are views showing a prohibited state of the shielding plate in the lock fitting, wherein FIG. 7A is a front view and FIG. 7B is a sectional view.

8A and 8B are views showing a released state of the shielding plate in the lock fitting, wherein FIG. 8A is a front view and FIG. 8B is a sectional view.

[Explanation of symbols]

 1 lock 2 door 3 lock body 4 bracket 5 latch bolt (engaging member) 10 strike 11 engaging opening 20 strike box (prohibiting means) 22 locking opening 23 locking opening 25 protrusion (prohibiting means, locking means) 31 Shielding Plate (Prohibiting Means) 31d Rotating Hole 31e Recess (Prohibiting Means, Locking Means) 32 Spring (Biasing Member, Prohibiting Means)

Claims (3)

[Utility model registration claims] 1. A strike box into which the engaging member is inserted by the protrusion of the engaging member built into the lock body,
A lock receiving fitting provided on a surface of the strike box, the strike locking the door by locking the engaging member, and a prohibiting means for prohibiting the insertion of the engaging member in the strike box. However, the lock bracket is provided so that it can be switched between a prohibited state and a released state for releasing the prohibition. 2. The above-mentioned prohibiting means comprises a shield plate which is movable in the strike box from the front surface side to the inner bottom side.
It consists of an urging member that urges this shield plate toward the front side in the strike box, and the shield plate urged to the front side in the above-mentioned prohibited state is fixed at the position locked on the back surface of the strike. 2. The lock according to claim 1, wherein, in the released state, the shield plate is formed at a fixed position where it is locked to the inner bottom of the strike box against the bias of the biasing member. Brackets. 3. The above-mentioned prohibition means has a locking opening formed in the side wall of the strike box at the bottom of the strike box, and rotates the shielding plate at the bottom of the strike box in the released state. This prevents the movement of the shielding plate to the front surface side of the strike box by locking the shielding plate in the locking opening, and locks the rotation of the shielding plate in the locking opening. The lock bracket according to claim 2, wherein the lock bracket is provided.