JPH10266177A - Lock and sluice gate thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lock and door structure, by which load required for opening and closing and driving a door can be reduced and in which structure can be simplified without limiting the height direction of a ship. SOLUTION: The lock 1 has the first sluice gate 2 and the second sluice gate 3 being installed at a regular interval and having the same constitution. The first sluice gate 2 has a door housing section 6 installed at a specified distance in a waterway so as not to get trouble in navigating ships, a door 5 freely projected and retreated to and from the door housing section 6, and a projecting-retreating device to and from the door housing section 6 of the door 5, and the inside is hollowed and an opening is formed to an underside in the door 5, and the projecting-retreating device is composed of an exhaust mechanism discharging air in the door 5 and an air-supply mechanism 7 forwarding air into the door 5 from the opening.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lock which does not require a large load for opening and closing the lock, and which does not limit the height of a navigating ship, and a lock thereof.

[0002]

2. Description of the Related Art Conventionally, locks for adjusting the water level for navigating ships in canals or waterways having a large difference in water level include wire rope winding type gates (hereinafter referred to as winding type gates).
There is a hydraulic cylinder drive type miter gate (hereinafter, referred to as miter gate). In the rewind type gate, a gate-shaped mount is provided over both banks of the waterway, a winch is arranged on the mount, and the winch is used to raise or lower the gate. On the other hand, two miter gates are located on both sides of the canal.
Gates of single doors are arranged, and these gates are rotated outwardly of the side wall by a hydraulic cylinder so as to close at an angle toward the upstream side.

[0003]

However, the above-mentioned rewind gate has a problem in that a winch is provided above the waterway, so that there is a limit in the height direction of a ship trying to navigate the waterway. There is. In addition, the miter gate has a problem that a large-diameter hydraulic cylinder must be used because the load for driving the gate to open and close is large, and the gate itself becomes very large. In addition, the above-described gate has a problem in that various members are exposed on the waterway and on both banks, and thus the landscape may be impaired, and further, there is a problem that the appearance is poor.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and can reduce the load required for opening / closing drive of a sluice gate. Another object of the present invention is to provide a lock and its lock that are simple and do not impair the scenery.

[0005]

In order to achieve the above object, a lock according to the present invention has a door with a hollow inside, an exhaust mechanism for exhausting air in the hollow, and air supply to the hollow. An air supply mechanism is provided. And, from the air supply mechanism, the water gate is raised or erected by blowing air toward the opening provided on the lower surface of the door to close the water channel,
Further, the air sent into the opening of the door is discharged by the exhaust mechanism, and the water gate is lowered or tilted to open the water channel.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first lock according to the present invention is a lock having a plurality of locks on a waterway for adjusting the water level in a canal or a waterway having a difference in water level, and is a hindrance to a navigating ship. A door storage unit provided at a predetermined distance in the waterway so that there is no door, a door that can freely enter and exit the door storage unit, and a device for entering and exiting the door storage unit of the door, Is hollow and has an opening on the lower surface, and the access device comprises an exhaust mechanism for discharging air from the door and an air supply mechanism for feeding air into the door from the opening.

A second lock according to the present invention is a lock having a plurality of locks on a waterway in order to adjust a water level in a canal or a waterway having a difference in water level. An upright holding step portion of a door provided at a distance, a door pivotally supported on both sides sandwiching the upright holding step portion, and an up / down device for the door, wherein the inside of the door is hollow and opens at the lower surface. In addition, the undulating device includes an exhaust mechanism for discharging air from the door and an air supply mechanism for feeding air into the door from the opening.

According to the above arrangement, to close the door of the floodgate, air is sent from the air supply mechanism to the opening of the door. When air supply to the hollow inside the door is started, water in the door is pushed to the outside by this air supply, and buoyancy is given to the door by the air filling the inside, and the door rises or rises, and the waterway Closes. Then, in order to open the door of the floodgate, the air inside the door that is in a floating or standing state is exhausted by an exhaust mechanism. When the air is exhausted from the inside of the door, the water enters the door instead of the air, and therefore falls or tilts due to the water that has entered the inside of the door and the weight of the door, and the water channel opens. In this way, the drive related to opening and closing the water channel only needs to send air into the opening of the door or exhaust air from the opening of the door,
There is no need to load the door itself.

In the above-mentioned second lock, if necessary, a shaft for pivoting the door up and down may be provided at a position eccentric toward the upright holding step. Thus, when the door is tilted when opening the water channel, the door can always be tilted in the same direction.

In each of the first and second locks, if necessary, a partition plate for partitioning the inside of the door into upper and lower portions is provided, and an upper portion thereof is formed as a sealed air chamber. An exhaust pipe communicating from the outside may be connected to the lower part, and in this way, the weight of the door in water,
The light is reduced by the buoyancy of the air in the air chamber, and the amount of air sent to the lower part can be reduced. Therefore, the door can be raised or raised quickly.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of a lock and its lock according to the present invention will be described below with reference to the drawings. FIG. 1 shows a schematic configuration of a lock according to a first embodiment of the present invention. FIG. 2 is a diagram illustrating the structure of the door according to the first embodiment. FIG. 3 is a partial detailed view of the water gate of the first embodiment. FIG. 4 shows a schematic configuration of a lock according to a second embodiment of the present invention. FIG. 5 is a diagram illustrating the structure of the door according to the second embodiment. In the following description, FIG.
The left side of the paper is described as upstream of the waterway, and the right side of the paper is described as downstream of the waterway.

First, the configuration of the lock according to the first embodiment will be described. As shown in FIGS. 1 (a) and 1 (b), the lock 1 adjusts the water level in order to make the ship S navigate in a waterway having a large water level difference, and moves from the upstream side to the downstream side at a predetermined distance from the waterway. A first floodgate 2 and a second floodgate 3 are provided. The first floodgate 2 and the second floodgate 3 have the same configuration. Hereinafter, the configuration of the first floodgate 2 will be described in detail on behalf of the first floodgate 2.

The first floodgate 2 has a door 5 for opening and closing the waterway, and a door storage portion 6 provided in the waterway so as not to hinder the navigation of the ship S.
And an access device including an air supply mechanism and an exhaust mechanism for moving the door 5 into and out of the door storage section 6, a pipe 8 connected upstream and downstream across the first floodgate 2, and opening and closing the pipe 8. And a valve 9 that operates. And the door storage section 6
In order to store the door 5 when the channel is in an open state, the bottom of the channel, for example, the bottom surface is dug down, and is constituted by opposed upstream side wall surfaces 6a and downstream side wall surfaces 6b.
A door receiving portion 6c is provided at an opposing position below the a and 6b.
The upper end of the upstream side wall surface 6a and the upper end of the downstream side wall surface 6b of the door storage portion 6 are made higher than the bottom of the water channel in order to prevent earth and sand or mud from entering the dug portion.

The door 5 has a configuration as shown in FIGS. 2 (a) and 2 (b). That is, the door 5 has a hollow shape opened downward, and the interior thereof is the partition plate 1 in this example.
0 defines an upper hollow chamber 5a and a lower hollow chamber 5b. The upper hollow chamber 5a is hermetically closed, while the lower hollow chamber 5b is supplied with air from an air supply mechanism 7 described later, which constitutes an access device. The lower hollow chamber 5b
As shown in the figure, for example, an exhaust pipe 11 drawn from the upper surface of the door 5 is provided on the upper surface of the door 5 from the partition plate 10 through the upper hollow chamber 5a in order to discharge the internal air. . An exhaust valve 13 is connected to the exhaust pipe 11 via a hose 12. This is the exhaust mechanism that constitutes the access device. Further, the door 5 is provided with watertight rubbers 14 on both sides and a lower part on both sides of the upstream surface and the downstream surface for reliably stopping water when the water channel is closed.

That is, the upper hollow chamber 5a of the door 5 is hermetically sealed in such a manner that a predetermined volume is secured in advance with respect to the weight of the door 5 in order to make the door 5 float quickly. As a result, the amount of air sent into the lower hollow chamber 5a can be reduced, so that the time for floating the door 5 can be reduced.

An air supply mechanism 7 for sending air to the door 5 described above.
Is configured as shown in FIG. The air supply mechanism 7
A compressor 15 provided on one shore is provided, and air is sent from the compressor 15 through the air supply pipe 16 to the underwater door storage unit 6. Further, the air supply mechanism 7 includes an outer pipe 17 fixed to the bottom surface of the door storage unit 6.
And an inner pipe 18 to which the air supply pipe 16 is connected. Each of the outer pipe 17 and the inner pipe 18 is provided with notches 17a and 18a, which are air supply holes, in the axial direction of the peripheral surface. The outer tube 17 is provided in a state where the notch 17a is open upward.

The inner tube 18 has both ends in the axial direction connected to the outer tube 1.
7 is pivotally supported on both wall surfaces of the shaft end.
A pinion 18b protrudes from one wall surface of the shaft end of the outer tube 17 and is provided on a peripheral surface of the protruding portion. This pinion 18b
As shown in FIG. 3, is engaged with a rack 19 that moves up and down with respect to the bottom of the door storage unit 6 by another external drive mechanism. That is, the air supply mechanism 7 rotates the inner tube 18 with respect to the outer tube 17 by the rack 19 and the pinion 18b, thereby moving the notch 18a of the inner tube 18 to the upper position or the lower position as shown in FIG. It is moved to the position.

Next, the operation of the lock 1 having the above configuration will be described.
This will be described below. In FIG. 1, the upstream of the first floodgate 2 is A
The section between the first floodgate 2 and the second floodgate 3 is defined as section B, and the downstream of the second floodgate 3 is defined as section C. For example, when the ship S navigates from the C section to the A section in a water channel in which the water levels of the A section and the B section are the same and the water level of the C section is lower than the water levels of the A and B sections. Operates the lock 1 as follows.

First, each door 5 of the first floodgate 2 and the second floodgate 3
5 is lifted to block each of the A to C compartments. In order to lift the door 5 and close the sluices 2 and 3, the exhaust valve 1 of the door 5
3 is closed, and the notch 18a of the inner tube 18 is set at the lower position as shown in FIG. 3C, the compressor 15 is operated, and a space formed in advance by the inner tube 18 and the outer tube 17 is formed. After the air is accumulated in the inner pipe 18, the rack 19 is driven to rotate the pinion 18 b to rotate the inner pipe 18.
Is turned upward. In this way, a large amount of air previously accumulated in the space formed by the inner pipe 18 and the outer pipe 17 is suddenly introduced into the lower hollow chamber 5b of the door 5 which is in contact with the door receiving portion 6c and is settled. The air supplied from the compressor 15 is then supplied to the inner pipe 1.
8 through the notch 18a and the notch 17a of the outer tube 17,
It is sequentially fed into the lower hollow chamber 5b of the door 5. The air sent into the lower hollow chamber 5b in this manner pushes the water filled in the lower hollow chamber 5b of the door 5 out of the door 5 and fills the water, causing the door 5 to float. After the door 5 floats, the rack 19 is turned so that the notch 18a of the inner pipe 18 faces downward.
And the compressor 15 is stopped.

At this time, the upper part of the door C is brought into contact with the door contact member 6d provided on both banks by the water pressure from the B section having a high water level, and the water-tight rubber 14 of the C section is respectively pressed. It comes into contact with the door storage part 6 and the upper part of the downstream side wall surface 6b, and completely blocks the B section and the C section. Next, the valve 9 of the pipe 8 connected between the sections B and C is opened. When this valve 9 is opened, water in section B, which is higher than section C,
The water flows until the water level of the plot and the plot C reach the same level. Then, in order to open the second floodgate 3, the exhaust valve 13 of the door 5 is opened, and the air in the lower hollow chamber 5b is evacuated. Thereby, the door 5
The buoyancy is reduced, and due to the water that has entered the lower hollow chamber 5b instead of air and the weight of the door 5, it sinks down until it comes into contact with the door receiving portion 6c, and is opened. Thereafter, ship S is advanced from section C to section B.

Further, after the ship S advances from the section C to the section B, the respective parts are driven as described above so as to close the second floodgate 3 again. Next, in order to advance the ship S from the section B to the section A, at the first floodgate 2 which is now closed, the valve 9 is opened, and after the water levels of the section A and the section B become the same level, Open the first floodgate 2. Then, after the first floodgate 2 is opened, the ship S is advanced from the section B to the section A, and the first and second floodgates 2 and 3 are both opened in a state where the boat S has advanced to the section A.

As described above, in the lock 1 of the present embodiment, air is sent into the lower hollow chamber 5b of the door 5 so as to float, so that a load for opening and closing the door 5 is significantly increased as compared with the conventional case. It can be made smaller and the door storage
Since various members for driving the opening and closing of the door 5 are provided on the bottom surface of the door, there are few members exposed on both banks and on the waterways, and the view is not spoiled. Since it is used, there is no need to worry about oil leakage unlike the hydraulic type. Further, when the door 5 is lifted, a large amount of air previously accumulated in the space formed by the inner pipe 18 and the outer pipe 17 is sent to the lower hollow chamber 5b at a stretch, and subsequently,
Since the air from the compressor 15 is sequentially sent, the time required for the door 5 to float can be reduced.

Next, a lock according to a second embodiment of the present invention will be described. As shown in FIGS. 4A and 4B, the lock 21
Has a first floodgate 22 on the upstream side and a second floodgate 23 on the downstream side provided at a predetermined distance in the waterway. First,
The second floodgates 22 and 23 have the same configuration. Hereinafter, the configuration of the first floodgate 22 will be described in detail.

The first sluice gate 22 is provided on the upstream side and the downstream side which are opposed to each other, and the doors 25, 25 which are inclined in a direction away from each other when the water path is open, and the closed state of the water path of the doors 25, 25. At this time, an upright holding step 26 for supporting the doors 25, 25 to hold the doors 25, 25 in an upright state, and a door receiving portion 26a for receiving the doors 25, 25 when the doors 25, 25 are tilted. ,
An undulating device including an air supply mechanism 27 for raising and lowering the doors 25 and 25 and an exhaust mechanism is provided. These components are different from those of the first embodiment.
A valve 29 is provided.

The door 25 has a configuration as shown in FIGS. 5 (a) and 5 (b). That is, the door 25 has a hollow shape opened downward, and the inside thereof is divided into an upper hollow chamber 25a and a lower hollow chamber 25b by a partition plate 30 in this example. Same, but
The shape of the lower part is semicircular, and a cutout portion 25c is provided in a part of the semicircular shape, and the lower part of the door 25 is biased in the direction in which the door 25 should be tilted at both ends of the channel width. The first embodiment differs from the first embodiment in that the eccentric shaft 25c is provided at each of the two shores at different positions.

In addition, the point that the upper hollow chamber 5a is sealed, the exhaust pipe 31, the hose 32, the exhaust valve 33, and the watertight rubber 34 are the same as in the first embodiment. Since the air supply mechanism 27 has the same configuration as that of the first embodiment, the description is omitted here.

Next, the operation of the lock 21 having the above configuration will be described below. In FIG. 1, a section A is located upstream of the first floodgate 22, a section B is located between the first floodgate 22 and the second floodgate 23, and a section C is located downstream of the second floodgate 23. And, for example, in a water channel in which the water level of the A section and the B section is the same, and the water level of the C section is lower than the water levels of the A and B sections,
When the ship S sails from the section C to the section A, the lock 21 is operated as follows.

First, the doors 25, 25 on the upstream side of the first floodgate 22 and the second floodgate 23 are erected, and the sections A to C are shut off. Here, the door 2 on the upstream side in the second floodgate 23
The reason for raising the 5 is to secure watertightness by the water pressure received on the door 25.

Then, in order to raise the door 25 and close the sluice, the exhaust valve 33 of the door 25 is used as in the first embodiment.
Is closed and the notch 18a of the inner pipe 18 is set at the lower position as shown in FIG. 3C, the compressor 15 is operated, and the space is formed in advance by the inner pipe 18 and the outer pipe 17. After the air is stored, the rack 19 is driven to rotate the pinion 18b to rotate the inner tube 18, and the cutout 18a of the inner tube 18 is turned upward. By doing so, the inner tube 1
A large amount of air previously accumulated in the space formed by the outer tube 8 and the outer tube 17 is sent into the lower hollow chamber 25b of the door 25 which is in contact with the door receiving portion 26c and is tilted, and is subsequently sent in a large amount. , The air supplied from the compressor 15 is
Through the notch 18a of the inner tube 18 and the notch 17a of the outer tube 17, the liquid is sequentially fed into the lower hollow chamber 25b of the door 25.
In this manner, the door 25 is filled with air in the lower hollow chamber 25b, rotates around the eccentric shaft 25d, and stands up.
Thereafter, the rack 19 is operated so that the notch 18a of the inner pipe 18 faces downward, and the compressor 15 is stopped.

The door 25, which has been rotated upright about the eccentric shaft 25d, comes into contact with the upright holding step 26 and stops rotating. Next, a pipe 8 connected between section B and section C
After the valve 9 is opened and the water levels in the sections B and C are set to the same level, the exhaust valve 33 of the door 25 is opened to open the second floodgate 23, and the air in the lower hollow chamber 25b is evacuated. Thereby, the buoyancy of the door 25 is reduced, the door 25 is tilted about the eccentric shaft 25d, and the door 25 is opened. Thereafter, ship S is advanced from section C to section B.

Further, after the ship S advances from the section C to the section B, the respective parts are driven as described above so as to close the second floodgate 23 again. Next, in order to advance the ship S from the section B to the section A, at the first floodgate 22, which is now closed,
After the valve 9 is opened and the water levels of the section A and the section B become the same level, the first floodgate 22 is opened. And the first floodgate 22
, The ship S is advanced from the section B to the section A, and the first and second floodgates 22 and 23 are both opened in a state where the ship S has advanced to the section A.

As described above, in the lock 21 of the second embodiment, air is sent into the lower hollow chamber 25b of the door 25 in the same manner as in the first embodiment, and the lock 21 rotates about the eccentric shaft 25d and stands up. As a result, the same function and effect as those of the first embodiment can be obtained, and the number of members exposed on both banks and waterways is smaller than that of the first embodiment. Is good.

The air supply mechanism 7, 27 used for the locks 1, 21 of the present invention has an outer pipe 17 and an inner pipe 18, and when the air supply operation is stopped, the outer pipe 17 peripheral surface. The notch 18a provided in the axial direction of the inner pipe 18 is directed downward with respect to the notch 17a provided in the upper axial direction of the inner pipe 18, and the inner pipe 18 rotates during the air supply operation to cut out the outer pipe 17. Since the notch 18a of the inner tube 18 is aligned with the position of the portion 17a, soil and mud entering from the notch 17a of the outer tube 17 supply air with the notch 18a of the inner tube 18 facing downward. For example, air is blown out from the notch 18a of the outer tube 17 by air, so that these notches 17a, 18a can be stably operated without being clogged with earth and sand or mud. In addition, a valve that opens only in the air supply direction may be provided on the cutout portion 18a of the outer pipe 18, and the inner pipe 17, the pinion 18b, the rack 19, and the like may be omitted.

In the above-described first embodiment, the lock of claim 4 is applied to the lock 1 according to claim 1, and in the second embodiment, the lock 21 of claim 3 is applied to the lock 21 according to claim 3. Although the water gate of claim 4 is applied, the first and second embodiments may be modified such that a partition plate is omitted in place of claim 4, and the shaft of claim 2 may be eccentric. Instead, the door may be tilted by another mechanism or member provided at the center of the center of gravity.

The lock of the present invention is not limited to the first and second embodiments, and various modifications are possible. For example,
In the lock 1 of the first embodiment, the door storage portion 6 is provided between the upstream side wall portion 6a and the downstream side wall portion 6b formed by dug the bottom of the waterway. In such a case, the upstream side wall and the downstream side wall may be provided on the bottom of the water channel, and the door storage section may be provided here. At that time, since earth and sand and mud do not enter the door storage section 6 as in the first embodiment, it is not necessary to provide a mud guard for this purpose.
Further, in order to rotate the inner pipe 18, the rack 19 and the pinion 18b are both used in the first and second embodiments. For example, a gear train may be used instead of the rack 19, The rotation drive shaft may be directly connected to the inner tube 18 and rotated.

Although the doors 5 and 25 in the first and second embodiments have the upper hollow chambers 5a and 25a provided therein for the above-described reason, they may be omitted. In that case, in order to open and close the water channel in the same time as in the first and second embodiments, compressed air or the like may be sent to the air sent into the hollow inside the door. In addition, all the operations of the lock described above can be operated remotely, whereby the opening and closing of the water channel can be performed smoothly, and the navigation of the ship can be performed smoothly. Furthermore, by making the upper end of the door 5 curved or pointed, the waterway can be closed more quickly without receiving water resistance when ascending.

[0037]

As described above, in the lock according to the present invention, in order to close the waterway, air is blown into the opening of the door, and the buoyancy causes the door to rise or stand up. Since the air is discharged from the opening and the door sinks or tilts due to the water that has entered the opening and the weight of the door, it is not necessary to apply a large load to the door itself as in the conventional hydraulic cylinder driven miter gate, Therefore, the structure can be made simple and simple, and the exposure of various members on both banks and on waterways can be suppressed. There is no additional restriction, and for opening and closing the door,
Since air is used, there is no need to worry about oil leakage unlike the hydraulic type.

Further, the water gate of the present invention has a hollow inside which is open downward, so that the weight of the door itself can be reduced. In addition, by providing a closed air chamber above the hollow inside, the water gate can be submerged. The weight of the door is reduced by the amount of the buoyancy of the air chamber, and the amount of air sent to the lower part when the gate is closed can be reduced. Therefore, the closing operation of the door can be performed quickly, and the load applied to the door can be reduced.

[Brief description of the drawings]

FIG. 1 shows a lock according to a first embodiment of the present invention, wherein (a)
Is a side view, and (b) is a plan view.

FIGS. 2A and 2B show a door applied to the lock according to the first embodiment of the present invention, wherein FIG. 2A is a perspective view and FIG. 2B is a cross-sectional view taken along line CC of FIG.

3 (a) is a perspective view, FIG. 3 (b) is a view showing a rack and a pinion, and FIG.
FIG. 3 is a sectional view taken along line AA of FIG.

FIG. 4 shows a lock according to a second embodiment of the present invention, wherein (a)
Is a side view, and (b) is a plan view.

FIGS. 5A and 5B show a door applied to a lock according to a second embodiment of the present invention, wherein FIG. 5A is a perspective view and FIG. 5B is a cross-sectional view taken along line CC of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Lock 2 First floodgate 3 Second floodgate 5 Door 5a Upper hollow chamber 5b Lower hollow chamber 6 Door storage section 6a Upstream side wall surface 6b Downstream side wall surface 7 Air supply mechanism 10 Partition plate 13 Exhaust valve 15 Compressor 17 Outer pipe 17a Notch 18 Inner pipe 18a Notch 21 Lock 22 First floodgate 23 Second floodgate 25 Door 25a Upper hollow chamber 25b Lower hollow chamber 25c Cutout section 25d Tilt eccentric shaft 26 Upright holding step 27 Air supply mechanism 30 Partition plate 33 Exhaust valve

Claims (4)

[Claims] 1. A lock having a plurality of locks on a waterway for adjusting a water level in a canal or a waterway having a difference in water level, wherein a lock is provided at a predetermined distance in the waterway so as not to hinder a navigating ship. A door storage unit provided at a distance, a door capable of freely entering and exiting the door storage unit, and a device for entering and exiting the door storage unit of the door, wherein the door is hollow and has an opening on a lower surface, The lock is characterized in that the access device comprises an exhaust mechanism for discharging air from the door, and an air supply mechanism for feeding air from the opening into the door. 2. A lock having a plurality of sluice gates on a waterway for adjusting a water level in a canal or a waterway having a difference in water level, wherein a lock provided at a predetermined distance in the waterway is held upright. A step part, a door pivotally supported on both sides sandwiching the standing holding step part, and a device for raising and lowering the door, wherein the door is hollow and an opening is provided on the lower surface, and Is a lock comprising an exhaust mechanism for discharging air from the door and an air supply mechanism for feeding air from the opening into the door. 3. The lock according to claim 2, wherein a shaft pivotally supporting the door so as to be able to move up and down is provided at a position eccentric toward the upright holding step. 4. A door, wherein a partition plate for partitioning the inside of the door into upper and lower parts is provided, an upper part of the door is a sealed air chamber, and an exhaust pipe communicating from outside is connected to a lower part. Item 5. A lock applied to the lock according to any one of Items 1 to 3.