Notepad

Abstract

To improve the running performance of a writing board.SOLUTION: A writing board 1 of the present invention includes a main board body 10 having a writable use surface located between two main longitudinal frames, and an auxiliary board body 30 which is foldably connected to the main board body 10 and has a writable use surface located between two auxiliary longitudinal frames. The main board body 10 includes a first caster portion 51 provided at the lower end of the main vertical frame of the two main vertical frames on the side to which the auxiliary board main body 30 is connected, and a second caster portion 52 provided at the lower end of the main vertical frame of the two main vertical frames on the side to which the auxiliary board body 30 is not connected. The auxiliary board body 30 has a third caster portion 53 provided at the lower end of the auxiliary vertical frame on the side opposite to the main board body 10 of the two auxiliary vertical frames.SELECTED DRAWING: Figure 8

Description

Technical Field

[0001] The present invention relates to a writing board such as a whiteboard, a copy board, a copy blackboard, etc.

Background Art

[0002] Currently, in meeting rooms and the like in many companies, writing boards such as whiteboards, copy boards, copy blackboards, etc. are used. Such writing boards are designed to be written on the board surface using volatile writing instruments. However, among such writing boards, in order to ensure a large number of writable pages, some have a board surface configured in a film shape, and new pages can be written by winding up this film. Although such a configuration can ensure a large number of writable pages, when it becomes necessary to write on a new page while referring to the content already wound up, the film has to be reciprocated many times.

[0003] As a writing board 500 that can solve the above problems, as shown in FIG. 13, there is one that includes a left board main body 501, a central board main body 502, and a right board main body 503 (see, for example, Patent Document 1). This writing board 500 is configured to be foldable at the boundary between the left board main body 501 and the central board main body 502 and at the boundary between the right board main body 503 and the central board main body 502. Therefore, when using the writing board 500, by arranging the left board main body 501 and the right board main body 503 on both sides of the central board main body 502, the usable surface can be enlarged.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] In the writing board 500 of Patent Document 1, casters are attached below the horizontal leg frames 524 provided on the left board main body 501, the central board main body 502, and the right board main body 503. Therefore, when changing the installation location of the writing board 500, the writing board 500 can be moved with the left board main body 501 and the right board main body 503 folded with respect to the central board main body 502.

[0006] In the writing board 500, the lengths of the two horizontal leg frames 524 provided at both ends of the central board main body 502 are substantially the same. Therefore, for example, when moving the folded writing board 500 to a space having a width substantially the same as the length of the horizontal leg frame 524 formed between the two installation members, as shown in Fig. 13(a), after arranging the longitudinal direction of the writing board 500 to be orthogonal to the opening of the space, as shown in Figs. 13(b) and 13(c), it is necessary to move the writing board 500 while maintaining the orthogonal state. Thus, there is a problem that the running performance of the writing board is very low.

[0007] Therefore, an object of the present invention is to provide a writing board that enables improvement of the running performance when moving in a folded state.

Means for Solving the Problem

[0008] The writing board according to the present invention includes a main board body having a writable use surface disposed between two main vertical frames, and an auxiliary board body foldably connected to the main board body and having a writable use surface disposed between two auxiliary vertical frames. The main board body has a connecting side caster portion provided at the lower end of the connecting side main vertical frame on the side where the auxiliary board body is connected among the two main vertical frames, and a non-connecting side caster portion provided at the lower end of the non-connecting side main vertical frame on the side where the auxiliary board body is not connected among the two main vertical frames. The auxiliary board body has an auxiliary caster portion provided at the lower end of the auxiliary vertical frame on the side opposite to the main board body among the two auxiliary vertical frames. The grounding width of the connecting side caster portion is different from the grounding width of the non-connecting side caster portion, and the grounding width of the auxiliary caster portion is smaller than the grounding width of the non-connecting side caster portion.

[0009] Accordingly, in the writing board according to the present invention, when moving the auxiliary board body in a folded state with respect to the main board body, since the auxiliary caster portion is disposed inside the grounding area between the connecting side caster portion and the non-connecting side caster portion, the folded auxiliary board body and the main board body are moved with the side having the smaller grounding width among the connecting side caster portion and the non-connecting side caster portion disposed forward, thereby improving the running performance of the writing board.

[0010] The writing board according to the present invention includes a main board body having a writable use surface disposed between two main vertical frames, and an auxiliary board body that is foldably connected to the main board body and has a writable use surface disposed between two auxiliary vertical frames. The main board body has a connecting-side caster portion provided at the lower end of the connecting-side main vertical frame on the side to which the auxiliary board body is connected among the two main vertical frames, and a non-connecting-side caster portion provided at the lower end of the non-connecting-side main vertical frame on the side to which the auxiliary board body is not connected among the two main vertical frames. The auxiliary board body has an auxiliary caster portion provided at the lower end of the auxiliary vertical frame on the side opposite to the main board body among the two auxiliary vertical frames. The grounding width of the connecting-side caster portion is different from the grounding width of the non-connecting-side caster portion, and in a state where the auxiliary board body is folded with respect to the main board body, the auxiliary caster portion is disposed inside a grounding region surrounded by the grounding portions of the connecting-side caster portion and the non-connecting-side caster portion.

[0011] Accordingly, in the writing board according to the present invention, when moving the auxiliary board body in a state of being folded with respect to the main board body, since the auxiliary caster portion is disposed inside the grounding region between the connecting-side caster portion and the non-connecting-side caster portion, the main board body with the folded auxiliary board body is moved with the smaller grounding width of the connecting-side caster portion and the non-connecting-side caster portion disposed forward, whereby the running performance of the writing board can be improved.

[0012] In the writing board according to the present invention, the connecting-side caster portion and the non-connecting-side caster portion each have two casters provided at both ends of a horizontal leg frame attached to the lower end of the main vertical frame.

[0013] As a result, in the writing board according to the present invention, since the connecting-side caster portion and the non-connecting-side caster portion have two casters provided at both ends of the horizontal leg frame, the grounding width of the connecting-side caster portion and the non-connecting-side caster portion becomes relatively large. Therefore, the stability when moving the auxiliary board body in a folded state with respect to the main board body is improved.

[0014] In the writing board according to the present invention, the horizontal leg frame has a mounting central portion to which the lower end of the main vertical frame is attached, and two mounting end portions respectively arranged on both longitudinal sides of the mounting central portion. The two mounting end portions are respectively arranged above the mounting central portion and support the caster on their lower surfaces.

[0015] As a result, in the writing board according to the present invention, when the caster is supported on the lower surface of the horizontal leg frame that extends linearly along the horizontal direction, the center of gravity of the entire writing board becomes high. On the other hand, by making the height of the mounting central portion that supports the lower end of the main vertical frame lower than the height of the mounting central portion to which the caster is attached, the center of gravity of the entire writing board can be lowered. Therefore, the writing board is less likely to tip over.

[0016] In the writing board according to the present invention, the grounding width of the connecting-side caster portion is smaller than the grounding width of the non-connecting-side caster portion, and the grounding width of the auxiliary caster portion is smaller than the grounding width of the connecting-side caster portion.

[0017] As a result, in the writing board according to the present invention, when the auxiliary board body is folded with respect to the main board body, the auxiliary caster portion can be surely arranged inside the grounding area surrounded by the connecting-side caster portion arranged in front of the main board body and the non-connecting-side caster portion arranged behind the main board body.

[0018] In the writing board according to the present invention, the auxiliary caster portion is composed of one caster attached to the lower end of the auxiliary vertical frame.

[0019] As a result, in the writing board according to the present invention, the number of components can be reduced as compared with the case where the auxiliary caster portion has two casters.

Brief Description of the Drawings

[0020]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Figure 12

Figure 13

Modes for Carrying Out the Invention

[0021] Hereinafter, the writing board according to the embodiment of the present invention will be described in detail with reference to the drawings.

[0022] (First Embodiment) As shown in FIG. 1, the writing board 1 of this embodiment has a main board body 10 and an auxiliary board body 30. At the boundary between the main board body 10 and the auxiliary board body 30, a connecting member 20 such as a hinge is attached in a direction symmetric to each other. Therefore, the auxiliary board body 30 is configured to be foldable with respect to the main board body 10.

[0023] Both the main board body 10 and the auxiliary board body 30 are plate-shaped members having a vertically long substantially rectangular shape. The lateral width of the main board body 10 is larger than the lateral width of the auxiliary board body 30. The width dimension of the main board body 10 is set to about 90 cm, and the width dimension of the auxiliary board body 30 is set to about 80 cm, which is larger than half of the width dimension of the main board body 10. The upper ends of the main board body 10 and the auxiliary board body 30 are arranged at a height of about 170 cm from the installation surface, for example, considering the physique of an average adult.

[0024] The main board body 10 has two main vertical frames 10a1, 10a2, an upper frame 10b1 and a lower frame 10b2 provided across the upper and lower ends of the two main vertical frames 10a1, 10a2, respectively, and a white board 10c. The two main vertical frames 10a1, 10a2, the upper frame 10b1 and the lower frame 10b2 are connected in a frame shape on the outer periphery of the main board body 10, and the white board 10c is arranged inside thereof.

[0025] Similarly, the auxiliary board body 30 has two auxiliary vertical frames 30a1 and 30a2, an upper frame 30b1 and a lower frame 30b2 that are respectively provided across the upper and lower ends of the two auxiliary vertical frames 30a1 and 30a2, and a whiteboard 30c. The two auxiliary vertical frames 30a1 and 30a2, the upper frame 30b1 and the lower frame 30b2 are connected in a frame shape at the outer peripheral part of the auxiliary board body 30, and the whiteboard 30c is arranged inside thereof.

[0026] Thus, in FIGS. 1 and 2, the main vertical frame 10a1 is arranged at the right end of the whiteboard 10c, and the main vertical frame 10a2 is arranged at the left end thereof. The auxiliary vertical frame 30a1 is arranged at the right end of the whiteboard 30c, and the auxiliary vertical frame 30a2 is arranged at the left end thereof. The whiteboards 10c and 30c each have a writable use surface on both the front and back surfaces. In the following description, the surface arranged on the front side in FIG. 1 is referred to as the front surface of the whiteboards 10c and 30c, and the surface arranged on the back side in FIG. 1 is referred to as the back surface of the whiteboards 10c and 30c.

[0027] The lower ends of the main vertical frames 10a1 and 10a2 of the main board body 10 are arranged below the lower ends of the lower frame 10b2 and the whiteboard 10c. A first caster part 51 (connected-side caster part 51) is provided at the lower end of the main vertical frame 10a1 (connected-side main vertical frame 10a1) on the side where the auxiliary board body 30 is connected among the two main vertical frames 10a1 and 10a2. A second caster part 52 (non-connected-side caster part 52) is provided at the lower end of the main vertical frame 10a2 (non-connected-side main vertical frame 10a2) on the side where the auxiliary board body 30 is not connected among the two main vertical frames 10a1 and 10a2.

[0028] The first caster part 51 has a horizontal leg frame 61 attached to the lower end of the main vertical frame 10a1, and two casters 61A respectively attached near both longitudinal ends of the horizontal leg frame 61. The horizontal leg frame 61 is attached so as to extend in a direction perpendicular to the lower frame 10b2.

[0029] The horizontal leg frame 61 has a mounting central portion 61a attached to the lower end of the main vertical frame 10a1, two inclined portions 61b that incline upward as going outward from both longitudinal ends of the mounting central portion 61a, and two mounting end portions 61c that extend outward from the outer ends of the inclined portions 61b respectively. The mounting central portion 61a and the two mounting end portions 61c are both plate-shaped portions arranged substantially horizontally, and the two mounting end portions 61c are arranged above the mounting central portion 61a. The two casters 61A are respectively attached to the lower surfaces of the mounting end portions 61c.

[0030] Similar to the first caster portion 51, the second caster portion 52 has a horizontal leg frame 62 attached to the lower end of the main vertical frame 10a2, and two casters 62A respectively attached near both longitudinal ends of the horizontal leg frame 62. The horizontal leg frame 62 is arranged to extend in a direction perpendicular to the lower frame 10b2.

[0031] The horizontal leg frame 62 has a mounting central portion 62a attached to the lower end of the main vertical frame 10a2, two inclined portions 62b that incline upward as going outward from both longitudinal ends of the mounting central portion 62a, and two mounting end portions 62c that extend outward from the outer ends of the inclined portions 62b respectively. The mounting central portion 62a and the two mounting end portions 62c are both plate-shaped portions arranged substantially horizontally, and the two mounting end portions 62c are arranged above the mounting central portion 62a. The two casters 62A are respectively attached to the lower surfaces of the mounting end portions 62c.

[0032] The lower end of the auxiliary vertical frame 30a1 of the auxiliary board body 30 is disposed below the lower ends of the lower frame 30b2 and the whiteboard 30c, and the lower end of the auxiliary vertical frame 30a2 is disposed at substantially the same height as the lower ends of the lower frame 30b2 and the whiteboard 30c. A third caster portion 53 (auxiliary caster portion 53) is provided at the lower end of the auxiliary vertical frame 30a1 on the side opposite to the main board body 10 among the two auxiliary vertical frames 30a1 and 30a2. The third caster portion 53 has one caster 63A attached to the lower end of the auxiliary vertical frame 30a1.

[0033] As shown in FIG. 3, the horizontal leg frame 61 of the first caster portion 51 and the horizontal leg frame 62 of the second caster portion 52 are provided substantially in parallel.

[0034] The two casters 61A, the two casters 62A, and the one caster 63A are each rotatably attached around a rotation axis along the vertical direction with respect to the horizontal leg frame 61, the horizontal leg frame 62, and the auxiliary vertical frame 30a1, and the direction in which the wheels rotate and move can be changed.

[0035] Therefore, the two casters 61A, the two casters 62A, and the one caster 63A can, for example, take a state in which the wheels rotate around an axis that is horizontal and parallel to the whiteboards 10c and 30c as shown in FIGS. 1 to 3, and can also take a state in which the wheels rotate around an axis that is horizontal and perpendicular to the whiteboards 10c and 30c as shown in FIG. 4.

[0036] The ground contact widths T1 of the first caster portion 51, T2 of the second caster portion 52, and T3 of the third caster portion 53 will be described with reference to FIG. 5.

[0037] In the present embodiment, in a state where the wheels of the casters 61A, 62A, and 63A are arranged substantially parallel to the whiteboards 10c and 30c (a state where the direction in which the wheels rotate and move is substantially parallel to the surfaces of the whiteboards 10c and 30c), with respect to the direction perpendicular to the surfaces of the whiteboards 10c and 30c, the width (maximum width) at which the first caster unit 51, the second caster unit 52, and the third caster unit 53 contact the installation surface is referred to as the ground contact width T1 of the first caster unit 51, the ground contact width T2 of the second caster unit 52, and the ground contact width T3 of the third caster unit 53.

[0038] As shown in FIG. 5(a), the ground contact width T1 of the first caster unit 51 is the maximum width of the ground contact portions of the two casters 61A, and specifically, it is the distance between the outer side surfaces of the wheels of the two casters 61A. Similarly, as shown in FIG. 5(b), the ground contact width T2 of the second caster unit 52 is the maximum width of the ground contact portions of the two casters 62A, and specifically, it is the distance between the outer side surfaces of the wheels of the two casters 62A. Also, as shown in FIG. 5(c), the ground contact width T3 of the third caster unit 53 is the maximum width of the ground contact portion of one caster 63A, and specifically, it is the distance between the outer side surfaces of the wheels of one caster 63A.

[0039] In the writing board 1 of the present embodiment, the ground contact width T1 of the first caster unit 51 is smaller than the ground contact width T2 of the second caster unit 52, and the ground contact width T3 of the third caster unit 53 is smaller than the ground contact width T2 of the second caster unit 52. Specifically, the ground contact width T1 of the first caster unit 51 is smaller than the ground contact width T2 of the second caster unit 52, and the ground contact width T3 of the third caster unit 53 is smaller than the ground contact width T1 of the first caster unit 51.

[0040] In the writing board 1 of the present embodiment, as described above, the auxiliary board main body 30 is foldably connected to the main board main body 10. Therefore, when the writing board 1 is in normal use (for example, when using the whiteboards 10c and 30c with a large use surface), the auxiliary board main body 30 is arranged substantially parallel to the main board main body 10 as shown in FIG. 1.

[0041] On the other hand, when moving the writing board 1, as shown in FIGS. 6 and 7, the auxiliary board main body 30 is folded with respect to the main board main body 10 such that the surface of the white board 10c faces the surface of the white board 30c in proximity. Thus, when moving the writing board 1, usually, with the auxiliary board main body 30 folded with respect to the main board main body 10, the first caster portion 51 of the main board main body 10 is arranged forward, and the second caster portion 52 is arranged rearward and then moved.

[0042] When the auxiliary board main body 30 is folded with respect to the main board main body 10, as shown in FIG. 8, the surface of the white board 10c of the board main body 10 and the surface of the white board 30c of the auxiliary board main body 30 are in a state of being substantially in contact. At this time, the third caster portion 53 is arranged closer to the second caster portion 52 than the center portion in the width direction of the main board main body 10 between the first caster portion 51 and the second caster portion 52. Thus, the third caster portion 53 is in the vicinity of the second caster portion 52 and is arranged inside the grounding width T2 of the second caster portion 52.

[0043] FIG. 8 shows the normal moving state of the writing board 1 (the state of moving in the right direction in FIG. 8), and the wheels of the two casters 61A, the two casters 62A, and the one caster 63A are arranged substantially parallel to the surfaces of the white boards 10c and 30c. As described above, since the grounding width T1 of the first caster portion 51 is smaller than the grounding width T2 of the second caster portion 52, the grounding area N (the area surrounded by the dashed-dotted line in FIG. 8) between the first caster portion 51 and the second caster portion 52 is a substantially trapezoidal area. The grounding area N is an area surrounded by the outer ends of the portions where the wheels of the two casters 61A are in contact with the installation surface respectively and the outer ends of the portions where the wheels of the two casters 62A are in contact with the installation surface respectively. Thus, in the state where the auxiliary board main body 30 is folded with respect to the main board main body 10, the third caster portion 53 is arranged inside the grounding area N between the first caster portion 51 and the second caster portion 52.

[0044] The operation when moving the writing board 1 will be described with reference to FIG. 9. Here, the case where the writing board 1 is moved to a space having a width substantially the same as the length of the horizontal leg frame 62 formed between two installation members will be described.

[0045] When moving the writing board 1, the ground contact width T1 of the first caster part 51 arranged in the front is smaller than the ground contact width T2 of the second caster part 52 arranged in the rear. Therefore, as shown in FIG. 9(a), even when the longitudinal direction of the writing board 1 is inclined with respect to the opening of the space, the front end portion of the writing board 1 can enter the space. Thereafter, as shown in FIGS. 9(b) and 9(c), by moving the writing board 1 while adjusting its orientation within the space, the entire writing board 1 can be moved into the space.

[0046] As described above, the writing board 1 of the present embodiment includes a main board body 10 having a writable use surface arranged between two main vertical frames 10a1 and 10a2, and an auxiliary board body 30 that is foldably connected to the main board body 10 and has a writable use surface arranged between two auxiliary vertical frames 30a1 and 30a2. The main board body 10 is a first caster part 51 that is a connection-side caster part provided at the lower end of the connection-side main vertical frame 10a1, which is the connection-side main vertical frame on the side where the auxiliary board body 30 is connected among the two main vertical frames 10a1 and 10a2, and a second caster part 52 that is a non-connection-side caster part provided at the lower end of the non-connection-side main vertical frame 10a2, which is the non-connection-side main vertical frame on the side where the auxiliary board body 30 is not connected among the two main vertical frames 10a1 and 10a2. The auxiliary board body 30 has a third caster part 53 that is an auxiliary caster part provided at the lower end of the auxiliary vertical frame 30a1 on the side opposite to the main board body 10 among the two auxiliary vertical frames 30a1 and 30a2. The ground contact width T1 of the first caster part 51, which is the connection-side caster part, is different from the ground contact width T2 of the second caster part 52, which is the non-connection-side caster part, and the ground contact width of the third caster part 53, which is the auxiliary caster part, is smaller than the ground contact width T2 of the second caster part 52, which is the non-connection-side caster part.

[0047] With such a configuration, when moving the auxiliary board body 30 in a folded state with respect to the main board body 10, since the third caster portion 53 is disposed inside the grounding region N between the first caster portion 51 and the second caster portion 52, the auxiliary board body 30 folded with the main board body 10 is moved with the first caster portion 51 having a smaller grounding width among the first caster portion 51 and the second caster portion 52 disposed forward, whereby the running performance of the writing board can be improved.

[0048] The writing board 1 of the present embodiment includes a main board body 10 having a writable use surface disposed between two main vertical frames 10a1 and 10a2, and an auxiliary board body 30 that is foldably connected to the main board body 10 and has a writable use surface disposed between two auxiliary vertical frames 30a1 and 30a2. The main board body 10 has a first caster portion 51 which is a connecting-side caster portion provided at the lower end of the main vertical frame 10a1 which is the connecting-side main vertical frame on the side where the auxiliary board body 30 is connected among the two main vertical frames 10a1 and 10a2, and a second caster portion 52 which is a non-connecting-side caster portion provided at the lower end of the main vertical frame 10a2 which is the non-connecting-side main vertical frame on the side where the auxiliary board body 30 is not connected among the two main vertical frames 10a1 and 10a2. The auxiliary board body 30 has a third caster portion 53 which is an auxiliary caster portion provided at the lower end of the auxiliary vertical frame 30a1 on the side opposite to the main board body 10 among the two auxiliary vertical frames 30a1 and 30a2. The third caster portion 53 which is the auxiliary caster portion is disposed inside a grounding region N surrounded by the grounding portion of the first caster portion 51 which is the connecting-side caster portion and the grounding portion of the second caster portion 52 which is the non-connecting-side caster portion.

[0049] With such a configuration, when moving the auxiliary board body 30 in a folded state with respect to the main board body 10, since the third caster portion 53 is disposed inside the grounding region N between the first caster portion 51 and the second caster portion 52, the auxiliary board body 30 with the main board body 10 folded can be moved with the first caster portion 51 having a smaller grounding width among the first caster portion 51 and the second caster portion 52 disposed forward, thereby improving the running performance of the writing board.

[0050] In the writing board 1 of the present embodiment, the first caster portion 51 and the second caster portion 52 each have two casters 61A, 62A provided at both ends of horizontal leg frames 61, 62 attached to the lower ends of the main vertical frames 10a1, 10a2.

[0051] With such a configuration, since the grounding widths of the first caster portion 51 and the second caster portion 52 are relatively large, the stability when moving the auxiliary board body 30 in a folded state with respect to the main board body 10 is improved.

[0052] In the writing board 1 of the present embodiment, the horizontal leg frames 61, 62 each have a mounting central portion 61a, 62a to which the lower ends of the main vertical frames 10a1, 10a2 are attached, and two mounting end portions 61c, 62c respectively disposed on both longitudinal sides of the mounting central portions 61a, 62a. The two mounting end portions 61c, 62c are respectively disposed above the mounting central portions 61a, 62a and support the casters 61A, 62A on their lower surfaces.

[0053] With such a configuration, when the casters 61A, 62A are supported on the lower surface of the horizontal leg frame extending linearly along the horizontal direction, the center of gravity of the entire writing board becomes high. On the other hand, by making the height of the mounting central portions 61a, 62a that support the lower ends of the main vertical frames 10a1, 10a2 lower than the height of the mounting central portions 61c, 62c to which the casters 61A, 62A are attached, the center of gravity of the entire writing board 1 can be lowered. Therefore, the writing board 1 is less likely to fall over.

[0054] In the writing board 1 of the present embodiment, the grounding width T1 of the first caster unit 51 which is the connecting side caster unit is smaller than the grounding width T2 of the second caster unit 52 which is the non-connecting side caster unit, and the grounding width T3 of the third caster unit 53 which is the auxiliary caster unit is smaller than the grounding width T1 of the first caster unit 51 which is the connecting side caster unit.

[0055] With such a configuration, when the auxiliary board main body 30 is folded with respect to the main board main body 10, the third caster unit 53 can be surely arranged inside the grounding area N surrounded by the first caster unit 51 arranged in front of the main board main body 10 and the second caster unit 52 arranged behind the main board main body 10.

[0056] In the writing board 1 of the present embodiment, the third caster unit 53 which is the auxiliary caster unit is composed of one caster 63A attached to the lower end of the auxiliary vertical frame 30a1.

[0057] With such a configuration, the number of parts can be reduced as compared with the case where the third caster unit 53 has two casters 63A.

[0058] (Second Embodiment) The main difference between the writing board 101 of the present embodiment and the writing board 1 of the first embodiment is that the writing board 1 has one auxiliary board main body 30 arranged on one side of the main board main body 10, while the writing board 101 has two auxiliary board main bodies 30, 130 arranged on both sides of the main board main body 10. In the configuration of the writing board 101 of the present embodiment, detailed description of the parts similar to the configuration of the writing board 1 is omitted.

[0059] As shown in FIG. 10, the writing board 101 of the present embodiment has a main board main body 10, an auxiliary board main body 30, and an auxiliary board main body 130. In the writing board 101, the configurations of the main board main body 10 and the auxiliary board main body 30 are the same as those of the writing board 1 of the first embodiment.

[0060] At the boundary between the main board body 10 and the auxiliary board body 130, a connecting member 120 such as a hinge is attached in a direction symmetric to each other. Therefore, the auxiliary board body 130 is configured to be foldable with respect to the main board body 10.

[0061] A second caster portion 52 is provided at the lower end of the main vertical frame 10a2 (connected side main vertical frame 10a2) on the side where the auxiliary board body 130 is connected among the two main vertical frames 10a1, 10a2. A first caster portion 51 is provided at the lower end of the main vertical frame 10a1 (non-connected side main vertical frame 10a1) on the side where the auxiliary board body 130 is not connected among the two main vertical frames 10a1, 10a2.

[0062] The auxiliary board body 130 is a plate-like member similar to the auxiliary board body 30, and has two auxiliary vertical frames 130a1, 130a2, an upper frame 130b1 and a lower frame 130b2 provided across the upper and lower ends of the two auxiliary vertical frames 130a1, 130a2, respectively, and a white board 130c. The two auxiliary vertical frames 130a1, 130a2, the upper frame 130b1 and the lower frame 130b2 are connected in a frame shape at the outer peripheral portion of the auxiliary board body 130, and the white board 130c is disposed inside thereof.

[0063] The lower end of the auxiliary vertical frame 130a1 of the auxiliary board body 130 is disposed below the lower ends of the lower frame 130b2 and the white board 130c, and the lower end of the auxiliary vertical frame 130a2 is disposed at substantially the same height as the lower ends of the lower frame 130b2 and the white board 130c. A third caster portion 153 is provided at the lower end of the auxiliary vertical frame 130a1 on the side opposite to the main board body 10 among the two auxiliary vertical frames 130a1, 130a2. The third caster portion 153 provided at the lower end of the auxiliary vertical frame 130a1 is the same as the third caster portion 53 provided at the lower end of the auxiliary vertical frame 30a1 of the auxiliary board body 30.

[0064] When moving the writing board 101, as shown in FIG. 11, the auxiliary board body 30 is folded with respect to the main board body 10 such that the surface of the white board 10c faces the surface of the white board 30c in proximity and opposition, and the auxiliary board body 130 is folded with respect to the main board body 10 such that the back surface of the white board 10c faces the back surface of the white board 130c in proximity and opposition. Thus, when moving the writing board 101, usually, with the auxiliary board body 30 and the auxiliary board body 130 folded with respect to the main board body 10, the first caster portion 51 of the main board body 10 is arranged forward, and it is moved in a state where the second caster portion 52 is arranged rearward.

[0065] In the writing board 101 of the present embodiment, regarding the main board body 10 and the auxiliary board body 30, similar to the first embodiment, the ground contact width T1 of the first caster portion 51 which is the connected side caster portion is different from the ground contact width T2 of the second caster portion 52 which is the non-connected side caster portion, and the ground contact width T3 of the third caster portion 53 which is the auxiliary caster portion is smaller than the ground contact width T2 of the second caster portion 52 which is the non-connected side caster portion. Specifically, the ground contact width T1 of the first caster portion 51 which is the connected side caster portion is smaller than the ground contact width T2 of the second caster portion 52 which is the non-connected side caster portion, and the ground contact width T3 of the third caster portion 53 which is the auxiliary caster portion is smaller than the ground contact width T1 of the first caster portion 51 which is the connected side caster portion.

[0066] Also, in the writing board 101 of the present embodiment, regarding the main board body 10 and the auxiliary board body 130, the ground contact width T2 of the second caster portion 52 which is the connected side caster portion is different from the ground contact width T1 of the first caster portion 51 which is the non-connected side caster portion, and the ground contact width T3 of the third caster portion 153 which is the auxiliary caster portion is smaller than the ground contact width T1 of the first caster portion 51 which is the non-connected side caster portion. Specifically, the ground contact width T2 of the second caster portion 52 which is the connected side caster portion is larger than the ground contact width T1 of the first caster portion 51 which is the non-connected side caster portion, and the ground contact width T3 of the third caster portion 53 which is the auxiliary caster portion is smaller than the ground contact width T1 of the first caster portion 51 which is the non-connected side caster portion.

[0067] FIG. 12 shows the normal moving state of the writing board 110 (the state of moving in the right direction in FIG. 12). The two casters 61A, the two casters 62A, and the one caster 63A are arranged such that their wheels are substantially parallel to the surfaces of the white boards 10c and 30c. As described above, since the ground contact width T1 of the first caster portion 51 is smaller than the ground contact width T2 of the second caster portion 52, the ground contact area N (the area surrounded by the dashed line in FIG. 12) between the first caster portion 51 and the second caster portion 52 is a substantially trapezoidal area. The ground contact area N is an area surrounded by the outer ends of the portions where the wheels of the two casters 61A are in contact with the installation surface respectively and the outer ends of the portions where the wheels of the two casters 62A are in contact with the installation surface respectively. Thus, in the state where the auxiliary board body 30 is folded with respect to the main board body 10, the third caster portion 53 is arranged inside the ground contact area N between the first caster portion 51 and the second caster portion 52, and the third caster portion 153 is arranged inside the ground contact area N between the first caster portion 51 and the second caster portion 52.

[0068] In the writing board 101 of the present embodiment, the same effects as those of the writing board 1 of the first embodiment can be obtained.

[0069] As described above, the embodiments of the present invention have been described. However, the configuration of the present embodiment is not limited to the above-described one, and various modifications are possible.

[0070] For example, in the above-described first embodiment, the ground contact width T1 of the first caster part 51, which is the connected-side caster part, is smaller than the ground contact width T2 of the second caster part 52, which is the non-connected-side caster part, and the ground contact width T3 of the third caster part 53, which is the auxiliary caster part, is smaller than the ground contact width T1 of the first caster part 51, which is the connected-side caster part. However, the present invention is not limited thereto. In the above-described first embodiment, when the ground contact width T1 of the first caster part 51, which is the connected-side caster part, is different from the ground contact width T2 of the second caster part 52, which is the non-connected-side caster part, and the ground contact width T3 of the third caster part 53, which is the auxiliary caster part, is smaller than the ground contact width T2 of the second caster part 52, which is the non-connected-side caster part, the same effect can be obtained. The same applies to the above-described second embodiment in this regard.

[0071] In the above-described first embodiment, the third caster part 53 is composed of one caster 63A attached to the lower end of the auxiliary vertical frame 30a1. However, the present invention is not limited thereto. The third caster part 53 may have a horizontal leg frame attached to the lower end of the auxiliary vertical frame 30a1 and two casters 61A respectively attached near both ends of the horizontal leg frame, similar to the first caster part 51 and the second caster part 52. The same applies to the third caster parts 53 and 153 of the above-described second embodiment in this regard.

[0072] In the above-described first embodiment, the horizontal leg frames 61 and 62 have two attachment end portions 61c and 62c that are arranged above the attachment central portions 61a and 62a and support the casters 61A and 62A on their lower surfaces. However, the present invention is not limited thereto. For example, the horizontal leg frames 61 and 62 may each extend along the horizontal direction (the attachment central portions 61a and 62a and the two attachment end portions 61c and 62c are at the same height), and the casters 61A and 62A may be attached below them. The same applies to the above-described second embodiment in this regard.

[0073] In the above-described first embodiment, the whiteboards 10c and 30c have writable use surfaces on both the front and back sides. However, they may have a writable use surface on only either the front or the back side. The same applies to the above-described second embodiment in this regard.

[0074] Other configurations can also be variously modified without departing from the spirit of the present invention.

Explanation of Reference Numerals

[0075] 1 Writing board 10 Board body 10a1 Main vertical frame (connected side main vertical frame; non-connected side main vertical frame) 10a2 Main vertical frame (non-connected side main vertical frame; connected side main vertical frame) 30 Auxiliary board body 30a1, 30a2 Auxiliary vertical frames 51 First caster part (connected side caster part; non-connected side caster part) 52 Second caster part (non-connected side caster part; connected side caster part) 53 Third caster part (auxiliary caster part) 61, 62 Horizontal leg frames 61a, 62a Mounting center parts 61c, 62c Mounting end parts 61A, 62A, 63A Casters 101 Writing board 130 Auxiliary board body 130a1, 130a2 Auxiliary vertical frames 153 Third caster part (auxiliary caster part) 163A Caster N Grounding area T1 Grounding width of the first caster part 51 T2 Grounding width of the second caster part 52 T3 Grounding width of the third caster part 53

Claims

1. A main board body having a writable use surface disposed between two main vertical frames, and an auxiliary board body having a writable use surface disposed between two auxiliary vertical frames and foldably connected to the main board body, wherein the main board body has a connecting side caster portion provided at a lower end of a connecting side main vertical frame on a side where the auxiliary board body is connected among the two main vertical frames, and a non-connecting side caster portion provided at a lower end of a non-connecting side main vertical frame on a side where the auxiliary board body is not connected among the two main vertical frames, the auxiliary board body has an auxiliary caster portion provided at a lower end of an auxiliary vertical frame on a side opposite to the main board body among the two auxiliary vertical frames, and a writing board, characterized in that a ground contact width of the connecting side caster portion is different from a ground contact width of the non-connecting side caster portion, and the ground contact width of the auxiliary caster portion is smaller than the ground contact width of the non-connecting side caster portion.

2. A main board body having a writable use surface disposed between two main vertical frames, and an auxiliary board body having a writable use surface disposed between two auxiliary vertical frames and foldably connected to the main board body, wherein the main board body has a connecting side caster portion provided at a lower end of a connecting side main vertical frame on a side where the auxiliary board body is connected among the two main vertical frames, and a non-connecting side caster portion provided at a lower end of a non-connecting side main vertical frame on a side where the auxiliary board body is not connected among the two main vertical frames, the auxiliary board body has an auxiliary caster portion provided at a lower end of an auxiliary vertical frame on a side opposite to the main board body among the two auxiliary vertical frames, a ground contact width of the connecting side caster portion is different from a ground contact width of the non-connecting side caster portion, and a writing board, characterized in that in a state where the auxiliary board body is folded with respect to the main board body, the auxiliary caster portion is disposed inside a ground contact area surrounded by a ground contact portion of the connecting side caster portion and a ground contact portion of the non-connecting side caster portion.

3. The writing board according to claim 1 or 2, characterized in that the connecting side caster portion and the non-connecting side caster portion each have two casters provided at both ends of a horizontal leg frame attached to a lower end of the main vertical frame.

4. The horizontal leg frame is a mounting central part to which the lower end of the main vertical frame is attached, and two mounting end parts respectively arranged on both longitudinal sides of the mounting central part, wherein the two mounting end parts are respectively arranged above the mounting central part and support the caster on their lower surfaces. The writing board according to claim 3, characterized in that.

5. the grounding width of the connecting-side caster part is smaller than the grounding width of the non-connecting-side caster part, and the grounding width of the auxiliary caster part is smaller than the grounding width of the connecting-side caster part. The writing board according to any one of claims 1 to 4, characterized in that.

6. the auxiliary caster part is composed of one caster attached to the lower end of the auxiliary vertical frame. The writing board according to any one of claims 1 to 5, characterized in that.

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