JPH11190132A - Movable baseboard device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a movable baseboard device which can surely prevent drop of a small load through blockage of a gap under a movable fence and makes mounting and removal at each opening/closing of the movable fence unnecessary. SOLUTION: A winding part 31 is mounted to the lower part of a first gate post 21 of a movable fence 2 for opening/closing a carrying-in/out gate 'G' of an elevating stage 1 of an elevator for construction, and a baseboard sheet 32 delivered from this winding part 31 and a restricting wire 33 are attached to a door pull post 232 at a movable end of a fence body 23. The baseboard sheet 32 is extended so that it blocks a gap between the fence body 23 and the elevating stage 1, and the restricting wire 33 is extended along the lower back of the fence body 23. The winding part 31 is provided with a lock mechanism for restricting rotation of a baseboard sheet winding drum when a tensile force in the delivery direction acts only on the baseboard sheet 32 of the baseboard sheet 32 and the restricting wire 33.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a clearance below a movable fence for opening and closing a carry-in / out gate on a stage, for example, in a lift stage of a construction elevator for vertically transporting workers and materials in civil engineering and construction work. TECHNICAL FIELD The present invention relates to a technique for preventing materials from falling down.

[0002]

2. Description of the Related Art A construction elevator for vertically transporting workers and materials in a construction work or the like has a lifting stage 1 as shown in FIG. 6, for example. The elevating stage 1 is moved up and down along a truss-like column standing on a foundation.
The left and right sides and the back side of the luggage loading space on the upper side are surrounded by a fixed fence (handrail) not shown, and the front side is a carry-in / out gate G which can be opened and closed by the movable fence 2. The movable fence 2 is fixed to first and second gate columns 21 and 22 erected at predetermined intervals on the left and right near the front edge of the floor surface of the lifting stage 1 and the first gate column 21. And a fence main body 23 which expands and contracts with the second gate post 22. Also,
The fence main body 23 has a fixed column 231 fixed to the first column 21 and a puller that can be locked on the second column 22 and can move on the floor of the elevating stage 1 via the free casters 234. A stretchable lattice body 233 is formed between the pillar 232 and a plurality of rods 233a, which are connected by crossing each other through a plurality of connection pins 233b (see FIG. 7) in a rhombic pattern.

[0003] That is, in the above elevator, when materials necessary for construction are loaded into the loading space S on the lifting stage 1, the fence main body 23 as shown by a chain line in FIG.
Is extended, and the pull-up post 232 is locked to the second gate post 22, thereby closing the carry-in / out gate G, thereby lifting and lowering the lift stage 1 in a state where loads and workers are prevented from falling down.

[0004]

However, there is a certain gap S between the lower end of the movable fence 2 having the above-mentioned structure and the floor surface of the lifting stage 1. Particularly, in the case of the structure shown in FIG. Each rod 233a is tilted as the eye-shaped lattice 233 is stretched, so that the movable fence 2 is pushed and contracted to the first gate post 21 side and the loading / unloading gate G is opened. The gap S increases. For this reason, a small load may fall from this gap S,
Therefore, conventionally, as shown in FIG. 7, in order to prevent a small load W from dropping from the gap S, the movable fence 2
After the loading / unloading gate G is closed, the lightweight scaffolding board 24 and the like are temporarily installed inside the movable fence 2 as a substitute for the baseboard. It is necessary to install or remove the board 24 and the like, and sometimes the operator forgets to install the lightweight scaffold board 24.

The present invention has been made in view of the above-mentioned circumstances, and the technical problem thereof is that the gap S below the movable fence 2 is closed so that a small load W can be reliably dropped. It is an object of the present invention to provide a movable baseboard that can be prevented and does not need to be installed or removed every time a material is carried into or taken out of the stage 1.

[0006]

Means for Solving the Problems The technical problems described above are:
This can be effectively solved by the present invention. That is, the movable skirting device according to the present invention includes a winding portion attached to a lower portion of the first gate post of the movable fence, and a lower end portion of the fence main body of the movable fence unrolled from the winding portion and a floor surface. A strip-shaped baseboard sheet that extends so as to close the gap and has an extended end connected to the movable end of the fence main body, and the winding unit is a tube that can be attached to a lower portion of the first gate post. And a skirting board winding drum which is rotatably provided in the cylindrical case and is urged in a rotating direction for winding the skirting sheet. According to this configuration, when the fence body of the movable fence is extended and closed, the baseboard sheet is fed out from the winding unit along with this,
Further, when the fence body is pressed and contracted toward the first gate post side in this state and opened, the skirting sheet is automatically wound on the skirting sheet winding drum in the winding section. For this reason, the baseboard sheet always exists so as to close the gap under the fence body, and the baseboard sheet winding drum built in the winding section is urged in the winding direction of the baseboard sheet. The baseboard sheet is stretched under a predetermined tension on the lower side of the fence body to effectively prevent an object from passing through the gap.

[0007] As a more preferable configuration added to the movable baseboard apparatus of the present invention, a wire winding drum provided at an upper end portion of a cylindrical case of a winding section, and a width which is unwound from the wire winding drum. A restraining wire extending above the wood sheet and along a lower portion of the fence body and having a tip connected to the movable end of the fence body; and a skirting board winding drum having a width in a state where the wire winding drum is stopped. When receiving the rotational force in the unwinding direction of the wood sheet, the rotation of the skirting sheet winding drum is restricted, and when the wire winding drum and the skirting sheet winding drum simultaneously receive the rotating force in the same direction, A lock mechanism for releasing the restraint is provided.

According to this configuration, when the fence body is expanded and contracted (open / closed), the wire winding drum and the baseboard sheet winding drum that are urged in the winding direction move with respect to the movement of the movable end of the fence body. Accordingly, the constraining wire and the baseboard sheet are rotated in the feeding direction or the winding direction via the constraining wire and the baseboard sheet, respectively, so that the constraining wire and the baseboard sheet are fed or wound together with expansion and contraction of the fence body. Also, for example, if the baseboard sheet is pulled in the unwinding direction by being pressed by an object that is going to pass through the gap between the fence body and the floor surface, the baseboard sheet winding drum causes the baseboard sheet to be fed out. At this time, the wire take-up drum is in a non-rotational state due to the urging force in the take-up direction and the tension of the restraining wire, so the lock mechanism operates in the unwinding direction of the baseboard sheet take-up drum. The rotation is constrained, so that the baseboard sheet is not fed out, and the baseboard sheet reliably prevents the movement of the object trying to pass through the gap.

[0009]

FIG. 1 shows a mounted state of a movable skirting device according to a preferred embodiment of the present invention. Reference numeral 1 denotes a construction for vertically transporting workers and materials in building construction. Reference numeral 2 denotes a movable fence that opens and closes a carry-in / out gate G on the front side of the luggage loading space on the lift stage 1. The movable fence 2 includes first and second gate posts 21 and 22 erected at predetermined intervals on the left and right near the front edge of the floor surface of the elevating stage 1, similarly to FIG. 6 described above, The fence main body 23 is fixed to the first gate post 21 and extends and contracts with the second gate post 22. Also,
The fence body 23 is connected to the first
A fixed pillar 231 fixed by 31a and a puller that can be locked to the second gate post 22 via a locking fitting 232a and can move left and right on the floor surface of the elevating stage 1 via a free caster 234. It has a structure in which a stretchable lattice body 233 is formed by connecting a large number of rods 233a with a plurality of connecting pins 233b (see FIG. 5) to cross each other between the pillars 232 in a rhombic manner.

The movable baseboard 3 according to one embodiment of the present invention is mounted on the movable fence 2 having the above configuration. As shown in the schematic horizontal cross-sectional view of FIG. 2, the movable baseboard device 3 includes a winding unit 31 attached via a clamp 35 to a lower part of the first portal 21 in the movable fence 2.
And a strip-shaped baseboard which is fed out from the winding section 31 and whose feeding ends 32a and 33a are connected via a clamp 36 and a connection fitting 37 to a pull post 232 which is a movable end of the fence body 23. A sheet 32 and a restraining wire 33;
A stopper 34 is provided near the feeding ends 32a, 33a to limit the winding amount of the baseboard sheet 32 and the restraining wire 33. The baseboard sheet 32 unwound from the winding section 31 is connected to the fence main body 23.
The restraining wire 33 is stretched along the lower back surface of the fence main body 23 so as to close a gap S between the lifting stage 1 and the lower back side of the fence body 23.

As shown in the vertical sectional view of FIG. 3, the internal structure of the winding unit 31 is a cylindrical case 310 and a baseboard sheet winding unit that is built in the cylindrical case 310 and winds the baseboard sheet 32. A wire winding drum 314 for winding the drum 313 and the restraining wire 33;
And a lock mechanism 318 for restraining the rotation of the thirteen in the feeding direction or releasing the restrained state.

More specifically, the cylindrical case 310 includes a cylindrical case body 310A, a cap member 310B screwed to the upper end thereof, and a bottom member 310C screwed to the lower end thereof. Become. Case body 310
A is a slit-shaped baseboard sheet integrally provided with a clamp 35 for fixing the winding portion 31 to a lower portion of the first gate post 21 of the movable fence 2 and extending in one axial direction (up and down) in the circumferential direction. An outlet 310a is opened. In addition, the outer peripheral wall of the cap member 310B forming the storage space for the wire winding drum 314 has a wire outlet 310 at a position substantially corresponding to the baseboard sheet outlet 310a.
b has been established. The stopper 34 attached to the baseboard sheet 32 and the vicinity of the feeding ends 32a and 33a of the restraining wire 33 is connected to the baseboard sheet feeding port 310.
a and a size that cannot pass through the wire outlet 310b, thereby restricting the winding amount of the baseboard sheet 32 and the restraining wire 33.

On the inner periphery of the upper end wall of the case body 310A,
A cylindrical non-rotating inner cylinder 311 is provided concentrically and integrally, and a non-rotating fixed shaft 312 extending vertically upward is provided concentrically and integrally with the bottom member 310C. The baseboard sheet winding drum 313 has a cylindrical shape, and the inner periphery of the upper end thereof is connected to the inner cylinder 31 via a bearing 313a.
1 is rotatably supported on the outer periphery of the upper end small diameter portion 311a, and the lower end inner periphery is connected to the fixed shaft 3 via a bearing 313b.
12 is rotatably supported on the outer periphery of the lower end thereof, and a disc-shaped guide flange 313c is formed to project from the outer periphery of the lower end. A bearing flange 313d is formed at a position appropriately lower than the lower end wall 311b of the inner cylinder 311 in the inner peripheral space of the baseboard sheet winding drum 313, and the upper end of the fixed shaft 312 is It protrudes upward through the inner circumference of the bearing flange 313d.

The wire winding drum 314 is provided on both sides in the axial direction.
A cylindrical bobbin having a flat bobbin shape having a disc-shaped guide flange 314a for preventing turbulence
10 is disposed in the inner peripheral space of the cap member 310B. The shaft of the wire winding drum 314 is rotatably supported at its upper end by a rotating shaft 315 rotatably supported by the shaft of the cap member 310B via a bearing 315a.

A first spiral spring 316 that urges the baseboard sheet winding drum 313 in the rotating direction is built in the space below the bearing flange 313d in the inner peripheral space of the baseboard sheet winding drum 313. Have been. That is, the first spiral spring 316 is provided so as to surround the outer periphery of the fixed shaft 312, one end is fixed to the fixed shaft 312, and the other end is fixed to the baseboard sheet winding drum 313. On the other hand, in the inner peripheral space of the inner cylinder 311, a second spiral spring 317 that urges the wire winding drum 314 in the winding rotation direction via the rotating shaft 315 is incorporated. That is, the second spiral spring 317 is provided so as to surround the outer periphery of the rotating shaft 315, and has one end thereof.
, And the other end is fixed to the inner cylinder 311.

The lock mechanism 318 is a non-rotating inner cylinder 3
11, a fixed gear 318A formed on the lower end wall, a rotating gear 318B rotatably disposed on a bearing flange 313d of the baseboard sheet winding drum 313, and an axial direction between the fixed gear 318A and the rotating gear 318B. The floating gear 318C is movably disposed, and includes an engagement pin 318D which is screwed into a plurality of circumferential positions of the baseboard sheet winding drum 313 and whose leading end is engaged with the floating gear 318C. The lower end of the rotating shaft 315 of the wire winding drum 314 is rotatably penetrated into a shaft hole formed in the shaft center of the fixed gear 318A and a shaft hole formed in the shaft center of the floating gear 318C. , Are rotatably mounted on the rotating gear 318B.

[0017] The upper mesh surface 318 ₃ of the floating gear 318C
As shown in the perspective view of FIG. 4, the gear has a shape having a large number of teeth extending radially about the axis, the meshing surface 318 ₁ of the fixed gear 318A meshable with the tooth, and the floating gear engagement surface 318 _{and second} interlockable rotary gear 318B which in the lower engagement surface 318 ₄ 318C are also respectively similarly formed.

As shown in FIG. 4, on the outer circumferential surface of the floating gear 318C, the cam grooves 318 ₅ in the circumferential direction a plurality of locations corresponding to the screwing position of the engaging pin 318D in baseboards sheet take-up drum 313 is formed ing. Each cam groove 318 ₅
The engagement pins 318 extend at an inclination angle such that the end of the baseboard sheet winding drum 313 in the winding rotation direction becomes lower, and project from the inner periphery of the baseboard sheet winding drum 313.
It is slidably engaged with the tip of D. This engagement pin 3
Engaging portion by 18D and the cam grooves 318 _5, the axial (vertical) of the floating gear 318C in the circumferential direction relative displacement of core print sheet take-up drum 313 and the wire winding drum 314 as it has the effect of converting the movement That is, the floating gear 318C
Is held in the non-rotation state, the engagement pin 318D
Move in the circumferential direction, the floating gear 318C
Is moved upward or downward to mesh with the rotating gear 318B or the fixed gear 318A.

In the baseboard sheet 32, reinforcing wires 322 are provided at both ends (upper and lower edges) in the width direction of an elongated strip-shaped sheet body 321 by bag sewing. One end of the baseboard sheet 32 in the longitudinal direction is fixed to the baseboard sheet take-up drum 313 in the above-described take-up section 31 and is wound around the outer periphery thereof, and the other end in the longitudinal direction is the case body of the cylindrical case 310. It is fed out from the baseboard sheet feeding port 310a of the base 310A to the outside, and as shown in FIG.
And a connecting fitting 37 integrated with the connecting member. Similarly, the restraining wire 33 has one end in the longitudinal direction fixed to the wire winding drum 314 in the winding portion 31 and is wound around the outer periphery thereof, and the other end in the longitudinal direction is the cap member 31 of the cylindrical case 310.
0B is fed out from the wire outlet 310b,
It is connected to the connection fitting 37.

Hereinafter, the movable baseboard device 3 having the above-described configuration will be described.
Will be described together with the operation of the movable fence 2. First, the movable fence 2 opens the loading / unloading gate G on the front side of the elevating stage 1, that is, as shown by a solid line in FIG.
In a state where the puller pillars 232 of the movable end are unevenly distributed toward the first gate pillar 21 side, the baseboard sheet 32 and the restraining wire 33 of the movable baseboard apparatus 3 are
Most of it is wound around the baseboard sheet winding drum 313 and the wire winding drum 314 in the winding section 31.

Next, when loading of building materials and the like into the luggage loading space on the elevating stage 1 is completed, the pull post 232 of the movable fence 2 is pulled to the right in the figure as shown by a dashed line in FIG. The fence main body 23 is extended, and the pull post 232 is connected to the second gate post 2 through the locking metal 232a.
2, the carry-in / out gate G of the elevating stage 1 is closed. At this time, as the pull post 232 moves toward the second gate post 22 side, the baseboard sheet 32 and the restraining wire 33 attached to the lower portion of the pull post 232 are taken up by the winding section. It is paid out from 31.

In the process of unwinding the baseboard sheet 32 and the restraining wire 33, the baseboard sheet winding drum 313 and the wire winding drum 31 in the winding section 31 are moved by the tension.
4 is rotated in the unwinding direction, and along with this, the first spiral spring 316 is subjected to torsional deformation between the skirting sheet winding drum 313 and the non-rotating fixed shaft 312, and is charged to accumulate. The second spiral spring 317 undergoes torsional deformation and is charged between the rotating shaft 315 that rotates integrally with the drum 314 and the non-rotating inner cylinder 311.

In the above-mentioned feeding process, the floating gear 318C of the lock mechanism 318 is located on the lower side in its movable range, is separated from the fixed gear 318A through a small gap, and rotates at the lower end of the rotary shaft 315.
It is in the state of being engaged with. Therefore, the floating gear 318
C is rotated integrally with the wire winding drum 314 via the rotating gear 318B and the rotating shaft 315, and the skirting sheet winding drum 313 on the outer periphery thereof is also moved at a constant speed with the wire winding drum 314 by feeding out the restraining wire 33. due to the rotation, the cam grooves 318 ₅ formed on the floating gear 318C,
Engagement pin 318D provided on baseboard sheet winding drum 313
Does not change. Therefore, the floating gear 318C is held in mesh with the rotating gear 318B, and the wire winding drum 314, the rotating shaft 315, the rotating gear 318B, the floating gear 318C, and the baseboard sheet winding drum 313 are fed out as an integral body. Rotate in the direction.

As shown by a dashed line in FIG. 1, the fence main body 23 of the movable fence 2 is extended and its pull post 23
5A, in the closed state of the carry-in / out gate G by locking the second gate 22 to the second gate post 22, the baseboard sheet 32 fed out from the take-up section 31 is connected to the fence main body 23 as shown in FIG. From the lower back side of the (grating body 233), the first spiral spring 3 is closed so as to close the gap S between itself and the elevating stage 1.
It is in a state of being stretched with an appropriate tension by the urging force of 16. Further, the restraining wire 33 on the baseboard sheet 32 is stretched along the lower back surface of the fence main body 23 (the lattice body 233) with an appropriate tension by the urging force of the second spiral spring 317. is there.

Here, the cargo W having a height shorter than the gap S between the upper surface thereof and the fence main body 23 is placed on the elevating stage 1.
When the cargo W moves toward the outside of the elevating stage 1 and tries to pass through the gap S for some reason, the cargo W
3B, the baseboard sheet 32 is pressed toward the outside of the gap S, so that a force in the feeding direction is applied to the baseboard sheet 32, and the baseboard sheet of the winding unit 31 shown in FIG. The winding drum 313 tries to rotate in the feeding direction.
On the other hand, since the above-described force in the feeding direction is not applied to the restraining wire 33 stretched along the lower back surface of the fence body 23, the wire winding drum 314 is caused by the urging force of the second spiral spring 317. In a stopped state,
Therefore, the rotating gear 318B and the floating gear 318C meshing therewith are also in a stopped state.

[0026] When the angular displacement in the rotational direction feeding is baseboards sheet take-up drum 313 in this state, relatively pushes up this integrated therewith of engaging pins 318D is toward the end of the lower side of the cam groove 318 ₅ While moving. That is, the floating gear 318C is pushed up along with the circumferential direction relative displacement of the cam grooves 318 ₅ and the engaging pin 318D, mesh with the meshing surfaces 318 ₂ with its lower engagement surfaces 318 ₄ rotating gear 318B is released the upper engagement surface 318 ₃ are engaged surface 318 ₁ and meshing of the fixed gear 318A with. Fixed gear 31
8A is a non-rotating inner cylinder 3 integral with the case body 310A.
Because it was formed in 11, are locked rotation of the floating gear 318C is by being engaged therewith, baseboards sheet take-up drum through the engagement portion between the cam grooves 318 ₅ and the engaging pin 318D The rotation in the feeding direction of 313 is also locked. Therefore, when the baseboard sheet 32 is pressed and displaced toward the outside of the gap S by the load W, the baseboard sheet 32 is immediately restrained, and the movement of the load W to the outside of the gap S is prevented.

Further, as shown by the dashed line in FIG. 1, when the carry-in / out gate G is closed, the lock of the pull post 232 with respect to the second gate post 22 is released, and the fence main body 23 is compressed to carry out the carry-out. In the process of opening the entrance gate G, with the movement of the pull post 232 to the first gate post 21 side,
The baseboard sheet 32 and the restraining wire 33 are automatically wound on the baseboard sheet winding drum 313 and the wire winding drum 314 that rotate in the winding direction by the urging forces of the first and second spiral springs 316 and 317, respectively. Taken. At this time, the baseboard sheet 32 and the restraining wire 33 described above are used.
Gear 318C is the same as the rotation gear 3
18B, the wire winding drum 314,
The rotating shaft 315, the rotating gear 318B, the floating gear 318C, and the baseboard sheet winding drum 313 rotate in the winding direction like an integral body.

Also, for example, immediately before the fence main body 23 is opened, the floating gear 318C of the lock mechanism 318 is pushed up to fix the fixed gear 31 as described above.
8A, the baseboard sheet winding drum 31
3 is locked in the feeding rotation direction, the baseboard 232 is moved to the first gate post 21 side when the loading / unloading gate G is opened. When the up drum 313 rotates in the winding direction by the urging force of the first spiral spring 316 is provided, integral therewith engaging pins 318D moves toward the end portion of the higher side of the cam groove 318 _5, its The floating gear 318C is pushed down by the reaction force, and the meshing state with the fixed gear 318A is released, and the floating gear 318C is meshed with the rotating gear 318B. Therefore, the locked state by the lock mechanism 318 is released, and the baseboard sheet winding drum 313 and the wire winding drum 314 perform the winding operation of the baseboard sheet 32 and the restraining wire 33.

The movable baseboard device of the present invention can be mounted not only on the movable fence having the above-mentioned rhombic lattice, but also on a movable fence having another structure. Also, various changes can be made to the detailed structure of the winding section in the movable baseboard device.

[0030]

According to the movable baseboard apparatus of the present invention, the baseboard sheet is unwound or taken up by the take-up section following the opening and closing operation of the fence main body. Unlike the case of using as a baseboard, there is no need to temporarily install or remove the fence main body each time the fence body is opened and closed. Further, in a state where the fence body is closed, the baseboard sheet fed from the winding unit is stretched so as to close the gap on the lower side of the fence body, so that the object passes through the gap to the outside of the stage. Falling can be effectively prevented. And this effect is that when the restraining wire stretched along the lower part of the fence body does not receive the force in the feeding direction and only the baseboard sheet receives the force in the feeding direction, the feeding of this baseboard sheet is performed. Providing the locking mechanism for restraining the operation enables more reliable performance.

[Brief description of the drawings]

FIG. 1 is a schematic configuration explanatory view showing a mounted state of a movable baseboard device according to an embodiment of the present invention.

FIG. 2 is a schematic horizontal sectional view of the baseboard device of the embodiment.

FIG. 3 is a schematic vertical sectional view showing an internal structure of a winding section in the baseboard device of the embodiment.

FIG. 4 is a perspective view showing a part of a lock mechanism of a winding section in the baseboard device of the embodiment.

FIG. 5 is an explanatory diagram showing a luggage drop prevention operation by the baseboard device of the embodiment.

FIG. 6 is an explanatory view showing an elevating stage of a construction elevator not having the movable baseboard device of the present invention.

FIG. 7 is an explanatory view showing a conventional method of preventing a load from falling.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Elevating stage (floor surface) 2 Movable fence 21 First gate post 22 Second gate post 23 Fence main body 232 Pull post (movable end) 3 Movable baseboard device 31 Winding unit 310 Cylindrical case 313 Baseboard sheet winding Drum 314 Wire winding drum 318 Lock mechanism 32 Baseboard sheet 33 Restraining wire

Claims (2)

[Claims] 1. A first and second gate post standing upright on a floor surface at a predetermined interval; and a movable end fixed to the first gate post and expanded and contracted between the second gate post and the movable end. A fence main body that can be locked to the second gate post; a winding unit attached to a lower part of the first gate post; and a fence fed out of the winding unit and A strip-shaped baseboard sheet that extends so as to close between the lower end of the main body and the floor surface and has an extended end connected to the movable end of the fence main body, wherein the winding unit includes the first winding unit. A cylindrical case attachable to a lower part of the gate post, and a baseboard sheet winding drum rotatably provided in the cylindrical case and urged in a rotation direction for winding the baseboard sheet. Characteristic movable baseboard device. 2. The fence body according to claim 1, further comprising: a wire winding drum provided at an upper end portion of the cylindrical case of the winding portion; A restraining wire extending along a lower portion and having a leading end connected to a movable end of the fence body; and Lock mechanism that restricts the rotation of the baseboard sheet winding drum when receiving the rotation force and releases the restriction when the wire winding drum and the baseboard sheet winding drum simultaneously receive rotational forces in the same direction. And a movable baseboard device comprising: