JP7704573B2 - Writing board - Google Patents

Description

The present invention relates to writing boards such as whiteboards, copy boards, and copy blackboards.

Currently, many companies use writing boards known as whiteboards, copy boards, copy blackboards, etc. in their conference rooms. These writing boards are designed so that writing can be done on the board surface using a non-volatile writing implement, but some of these writing boards have a film-like board surface in order to ensure a large number of pages on which writing can be done, and new pages can be written on by rolling up this film. Although such boards can ensure a large number of pages on which writing can be done, if it becomes necessary to write on a new page while looking at the contents that have already been rolled up, the film must be rolled back and forth many times.

As shown in FIG. 13, a writing board 500 that can eliminate the above-mentioned problems includes a left board body 501, a center board body 502, and a right board body 503 (see, for example, Patent Document 1). This writing board 500 is configured so that it can be folded at the boundary between the left board body 501 and the center board body 502 and at the boundary between the right board body 503 and the center board body 502. Therefore, when using the writing board 500, the usable surface can be increased by arranging the left board body 501 and the right board body 503 on both sides of the center board body 502.

JP 2003-254891 A

In the writing board 500 of Patent Document 1, casters are attached to the lower part of the horizontal leg frames 524 provided on the left board body 501, the center board body 502, and the right board body 503. Therefore, when changing the installation location of the writing board 500, the writing board 500 can be moved with the left board body 501 and the right board body 503 folded relative to the center board body 502.

In the writing board 500, the two horizontal leg frames 524 provided at both ends of the central board body 502 are approximately the same length. Therefore, for example, when moving the folded writing board 500 into a space having a width approximately the same as the length of the horizontal leg frame 524 formed between two installation members, as shown in FIG. 13(a), it is necessary to position the writing board 500 so that its longitudinal direction is perpendicular to the opening of the space, and then move the writing board 500 while maintaining the perpendicular state, as shown in FIG. 13(b) and FIG. 13(c). Thus, there is a problem in that the running performance of the writing board is very low.

The object of the present invention is to provide a writing board that improves running performance when moved in a folded state.

The writing board according to the present invention comprises a main board body having a writable surface disposed between two main vertical frames, and an auxiliary board body foldably connected to the main board body and having a writable surface disposed between two auxiliary vertical frames, the main board body having a connecting side caster part 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 part 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 having an auxiliary caster part 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 ground width of the connecting side caster part and the ground width of the non-connecting side caster part being different, and the ground width of the auxiliary caster part being smaller than the ground width of the non-connecting side caster part.

As a result, in the writing board according to the present invention, when the auxiliary board body is moved in a folded state relative to the main board body, the auxiliary caster parts are positioned inside the ground contact area between the connecting caster parts and the non-connecting caster parts, so that the main board body with the folded auxiliary board body is moved in a state in which the connecting caster part or the non-connecting caster part with the smaller ground contact width is positioned forward, thereby improving the running performance of the writing board.

The writing board according to the present invention comprises a main board body having a writable surface disposed between two main vertical frames, and an auxiliary board body foldably connected to the main board body and disposed between two auxiliary vertical frames, the main board body having a writable surface, the main board body having a connecting side caster part 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 part 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 having an auxiliary caster part provided at the lower end of the auxiliary vertical frame on the opposite side to the main board body among the two auxiliary vertical frames, the ground contact width of the connecting side caster part and the ground contact width of the non-connecting side caster part being different, and the auxiliary caster part being disposed inside the ground contact area surrounded by the ground contact part of the connecting side caster part and the ground contact part of the non-connecting side caster part when the auxiliary board body is folded relative to the main board body.

As a result, in the writing board according to the present invention, when the auxiliary board body is moved in a folded state relative to the main board body, the auxiliary caster parts are positioned inside the ground contact area between the connecting caster parts and the non-connecting caster parts, so that the main board body with the folded auxiliary board body is moved in a state in which the connecting caster part or the non-connecting caster part with the smaller ground contact width is positioned forward, thereby improving the running performance of the writing board.

In the writing board according to the present invention, the connecting caster portion and the non-connecting 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.

As a result, in the writing board according to the present invention, the connecting caster section and the non-connecting caster section have two casters provided at both ends of the horizontal leg frame, so the contact width of the connecting caster section and the non-connecting caster section is relatively large. This improves stability when moving the auxiliary board body in a folded state relative to the main board body.

In the writing board of the present invention, the horizontal leg frame has a central mounting portion to which the lower end of the main vertical frame is attached, and two mounting end portions disposed on either side of the central mounting portion in the longitudinal direction, and each of the two mounting end portions is disposed above the central mounting portion and supports the casters on its underside.

As a result, in the writing board of the present invention, when casters are supported on the underside of a horizontal leg frame that extends linearly along the horizontal direction, the center of gravity of the entire writing board becomes high. However, by making the height of the central mounting part that supports the lower end of the main vertical frame lower than the height of the central mounting part where the casters are attached, the center of gravity of the entire writing board can be lowered. This makes it less likely for the writing board to tip over.

The writing board according to the present invention is characterized in that the ground contact width of the connecting caster part is smaller than the ground contact width of the non-connecting caster part, and the ground contact width of the auxiliary caster part is smaller than the ground contact width of the connecting caster part.

As a result, in the writing board according to the present invention, when the auxiliary board body is folded relative to the main board body, the auxiliary caster parts can be reliably positioned inside the contact area surrounded by the connecting caster parts located in front of the main board body and the non-connecting caster parts located behind the main board body.

The writing board according to the present invention is characterized in that the auxiliary caster section is composed of one caster attached to the lower end of the auxiliary vertical frame.

As a result, the writing board of the present invention can reduce the number of parts compared to when the auxiliary caster part has two casters.

1 is a perspective view of the appearance of a writing board 1 according to a first embodiment of the present invention; FIG. 2 is a front view of the writing board 1 of FIG. FIG. 2 is a plan view of the writing board 1 of FIG. 2 is a perspective view showing the configuration of a first caster portion 51, a second caster portion 52, and a third caster portion 53 of the writing board 1 of FIG. 1. 2 is a side view for explaining the ground contact widths of a first caster portion 51, a second caster portion 52, and a third caster portion 53 of the writing board 1 of FIG. 1. FIG. 2 is a perspective view of the appearance of the writing board 1 of FIG. 1 in a folded state. FIG. 2 is a front view of the writing board 1 of FIG. 1 in a folded state. FIG. 2 is a plan view of the writing board 1 of FIG. 1 in a folded state. 2A to 2C are diagrams illustrating the operation of moving the writing board 1 in FIG. 1 in a folded state. FIG. 11 is an external perspective view of a writing board 101 according to a second embodiment of the present invention. FIG. 11 is a perspective view of the appearance of the writing board 101 in FIG. 10 in a folded state. FIG. 11 is a plan view of the writing board 101 of FIG. 10 in a folded state. 11A and 11B are diagrams illustrating the operation of moving a conventional writing board 500 in a folded state.

The writing board according to an embodiment of the present invention will be described in detail below with reference to the drawings.

First Embodiment
1, the writing board 1 of this embodiment has a main board body 10 and an auxiliary board body 30. A connecting member 20 such as a hinge is attached to the boundary between the main board body 10 and the auxiliary board body 30 in a symmetrical orientation. Therefore, the auxiliary board body 30 is configured to be foldable relative to the main board body 10.

The main board body 10 and the auxiliary board body 30 are both plate-like members having a vertically elongated, approximately rectangular shape. The width of the main board body 10 is greater than the width of the auxiliary board body 30. The width of the main board body 10 is set to approximately 90 cm, and the width of the auxiliary board body 30 is set to approximately 80 cm, which is greater than half the width of the main board body 10. The upper ends of the main board body 10 and the auxiliary board body 30 are positioned at a height of, for example, approximately 170 cm from the installation surface, taking into account the average adult physique, etc.

The main board body 10 has two main vertical frames _10a1 , _10a2 , an upper frame _10b1 and a lower frame _10b2 respectively provided across the upper and lower ends of the two main vertical frames 10a1, _10a2 , and a whiteboard _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 whiteboard 10c is disposed inside thereof.

Similarly, the auxiliary board main body 30 has two auxiliary vertical frames _30a1 , _30a2 , an upper frame _30b1 and a lower frame _30b2 respectively provided across the upper and lower ends of the two auxiliary vertical frames _{30a1, 30a2 ,} and a whiteboard 30c. The two auxiliary vertical frames _30a1 , _30a2 , the upper frame _30b1 and the lower frame _30b2 are connected in a frame shape on the outer periphery of the auxiliary board main body 30, and the whiteboard 30c is disposed inside thereof.

1 and 2, the main vertical frame _10a1 is disposed at the right end of the whiteboard 10c, and the main vertical frame _10a2 is disposed at its left end. The auxiliary vertical frame _30a1 is disposed at the right end of the whiteboard 30c, and the auxiliary vertical frame 30a2 is disposed at its left end. The whiteboards 10c, 30c each have a writable usable surface on both the front and back sides. In the following description, the surface disposed on the front side in FIG. ₁ is referred to as the front side of the whiteboard 10c, 30c, and the surface disposed on the rear side in FIG. 1 is referred to as the back side of the whiteboard 10c, 30c.

The lower ends of the main vertical frames _10a1 , _10a2 of the main board body 10 are disposed lower than the lower ends of the lower frame _10b2 and the whiteboard 10c. A first caster portion ₅₁ (connecting side caster portion 51 ₎ is provided at the lower end of the main vertical frame _10a1 (connecting side main vertical frame _10a1 ) of the two main vertical frames _10a1 , 10a2 to which the auxiliary board body 30 is connected. A second caster portion 52 (non-connecting side caster portion 52) is provided at the lower end of the main vertical frame _10a2 (non-connecting side main vertical frame _10a2 ) of the two main vertical frames 10a1, _10a2 to which the auxiliary board body 30 is not connected.

The first caster portion 51 has a horizontal leg frame 61 attached to the lower end of the main vertical frame _10a1 and two casters 61A attached near both longitudinal ends of the horizontal leg frame 61. The horizontal leg frame 61 is attached to the lower frame _10b2 so as to extend vertically.

The horizontal leg frame 61 has a central mounting portion 61a attached to the lower end of the main vertical frame 10a- ₁ , two inclined portions 61b that incline upward as they move outward from both longitudinal ends of the central mounting portion 61a, and two mounting end portions 61c that extend outward from the outer ends of the inclined portions 61b. The central mounting portion 61a and the two mounting end portions 61c are both plate-like portions that are disposed substantially horizontally, and the two mounting end portions 61c are disposed above the central mounting portion 61a. The two casters 61A are attached to the lower surfaces of the mounting end portions 61c.

Like 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 attached near both longitudinal ends of the horizontal leg frame 62. The horizontal leg frame 62 is disposed so as to extend vertically relative to the lower frame _10b2 .

The horizontal leg frame 62 has a central mounting portion 62a attached to the lower end of the main vertical frame 10a ₂ , two inclined portions 62b that incline upward as they move outward from both longitudinal ends of the central mounting portion 62a, and two mounting end portions 62c that extend outward from the outer ends of the inclined portions 62b. The central mounting portion 62a and the two mounting end portions 62c are both plate-like portions that are disposed substantially horizontally, and the two mounting end portions 62c are disposed above the central mounting portion 62a. The two casters 62A are attached to the lower surfaces of the mounting end portions 62c.

The lower end of the auxiliary vertical frame 30a1 of the auxiliary board main body ₃₀ is disposed lower than 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 approximately the same height as the lower ends of the lower frame 30b2 and the whiteboard 30c. Of the two auxiliary vertical frames _30a1 , _30a2 , the auxiliary vertical frame 30a1 on the opposite side to the main board main body ₁₀ is provided at the lower end with a third caster portion 53 (auxiliary caster portion 53). The third caster portion 53 has one caster 63A attached to the lower end of the auxiliary vertical frame _30a1 .

As shown in FIG. 3, the horizontal leg frame 61 of the first caster section 51 and the horizontal leg frame 62 of the second caster section 52 are arranged substantially parallel to each other.

The two casters 61A, the two casters 62A and the one caster 63A are respectively attached so as to be freely rotatable around rotation axes aligned vertically 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.

Therefore, the two casters 61A, the two casters 62A, and the one caster 63A can be in a state where the wheels rotate around an axis that is horizontal and parallel to the whiteboards 10c and 30c, as shown in Figures 1 to 3, and can also be in a state where the wheels rotate around an axis that is horizontal and perpendicular to the whiteboards 10c and 30c, as shown in Figure 4.

The ground contact width T1 of the first caster portion 51, the ground contact width T2 of the second caster portion 52, and the ground contact width T3 of the third caster portion 53 are explained with reference to FIG. 5.

In this embodiment, when the wheels of the casters 61A, 62A, 63A are arranged approximately parallel to the whiteboards 10c, 30c (the direction in which the wheels rotate and move is approximately parallel to the surface of the whiteboards 10c, 30c), the widths (maximum widths) at which the first caster portion 51, the second caster portion 52, and the third caster portion 53 come into contact with the installation surface in a direction perpendicular to the surface of the whiteboards 10c, 30c are referred to as the ground contact width T1 of the first caster portion 51, the ground contact width T2 of the second caster portion 52, and the ground contact width T3 of the third caster portion 53.

The ground contact width T1 of the first caster part 51 is the maximum width of the ground contact part of the two casters 61A, specifically the distance between the outer surfaces of the wheels of the two casters 61A, as shown in FIG. 5(a). Similarly, the ground contact width T2 of the second caster part 52 is the maximum width of the ground contact part of the two casters 62A, specifically the distance between the outer surfaces of the wheels of the two casters 62A, as shown in FIG. 5(b). Furthermore, the ground contact width T3 of the third caster part 53 is the maximum width of the ground contact part of one caster 63A, specifically the distance between the outer surfaces of the wheels of one caster 63A, as shown in FIG. 5(c).

In the writing board 1 of this embodiment, 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, and the ground contact width T3 of the third caster portion 53 is smaller than the ground contact width T2 of the second caster portion 52. In detail, 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, and the ground contact width T3 of the third caster portion 53 is smaller than the ground contact width T1 of the first caster portion 51.

In the writing board 1 of this embodiment, the auxiliary board body 30 is foldably connected to the main board body 10 as described above. Therefore, when the writing board 1 is in normal use (for example, when the whiteboards 10c, 30c are used with a large usable surface), the auxiliary board body 30 is positioned approximately parallel to the main board body 10 as shown in FIG. 1.

In contrast, when the writing board 1 is moved, the auxiliary board body 30 is folded relative to the main board body 10 so that the surface of the whiteboard 10c faces closely to the surface of the whiteboard 30c, as shown in Figures 6 and 7. In this way, when the writing board 1 is moved, it is usually moved with the auxiliary board body 30 folded relative to the main board body 10, the first caster portion 51 of the main board body 10 positioned forward, and the second caster portion 52 positioned rearward.

When the auxiliary board body 30 is folded relative to the main board body 10, as shown in FIG. 8, the surface of the whiteboard 10c of the board body 10 and the surface of the whiteboard 30c of the auxiliary board body 30 are in substantial contact with each other. At this time, the third caster portion 53 is positioned between the first caster portion 51 and the second caster portion 52, closer to the second caster portion 52 than to the center portion in the width direction of the main board body 10. In this way, the third caster portion 53 is positioned near the second caster portion 52 and inside the ground contact width T2 of the second caster portion 52.

Figure 8 shows the normal movement state of the writing board 1 (moving to the right in Figure 8), where the wheels of the two casters 61A, the two casters 62A, and the one caster 63A are arranged approximately parallel to the surface of the whiteboard 10c, 30c. As described above, since the ground contact width T1 of the first caster part 51 is smaller than the ground contact width T2 of the second caster part 52, the ground contact area N (area surrounded by a dashed line in Figure 8) between the first caster part 51 and the second caster part 52 is an approximately trapezoidal area. The ground contact area N is an area surrounded by the outer ends of the parts where the wheels of the two casters 61A are in contact with the installation surface and the outer ends of the parts where the wheels of the two casters 62A are in contact with the installation surface. In this way, when the auxiliary board body 30 is folded relative to the main board body 10, the third caster portion 53 is positioned inside the ground contact area N between the first caster portion 51 and the second caster portion 52.

The operation of moving the writing board 1 will be described with reference to FIG. 9. Here, we will explain the case where the writing board 1 is moved into a space having a width approximately equal to the length of the horizontal leg frame 62 formed between two installation members.

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

As described above, the writing board 1 of this embodiment includes the main board body 10 having a writable surface disposed between the two main vertical frames _10a1 , _10a2 , and the auxiliary board body 30 having a writable surface disposed between the two auxiliary vertical frames _30a1 , _30a2 , which is foldably connected to the main board body 10. The main board body 10 has a first caster portion 51 which is a connecting side caster portion provided at a lower end of the main vertical frame _10a1 which is a connecting side main vertical frame on the side to which the auxiliary board body 30 is connected among the two main vertical frames _10a1 , _10a2 , and a second caster portion 52 which is a non-connecting side caster portion provided at a lower end of the main vertical frame 10a2 which is a non-connecting side main vertical frame on the side to which the auxiliary board body ₃₀ is not connected among the two main vertical frames _10a1 , _10a2 . The auxiliary board body 30 is connected to the two auxiliary vertical frames _30a1 , 30a2. The third caster portion 53 is an auxiliary caster portion provided at the lower end of the auxiliary vertical frame 30a ₁ on the opposite side of the main board body 10 of the _two caster portions 30a and 30b ...

With this configuration, when the auxiliary board body 30 is moved in a folded state relative to the main board body 10, the third caster portion 53 is positioned inside the ground contact area N between the first caster portion 51 and the second caster portion 52. Therefore, by moving the main board body 10 with the folded auxiliary board body 30 with the first caster portion 51, which has the smaller ground contact width of the first caster portion 51 and the second caster portion 52, positioned forward, the running performance of the writing board can be improved.

The writing board 1 of this embodiment includes a main board body 10 having a writable surface disposed between two main vertical frames _10a1 , _10a2 , and an auxiliary board body 30 having a writable surface disposed between two auxiliary vertical frames _30a1 , _30a2 , which is foldably connected to the main board body 10. The main board body 10 has a first caster portion 51 which is a connecting side caster portion provided at a lower end of the main vertical frame _{10a1 which} is a connecting side main vertical frame on the side to which the auxiliary board body 30 is connected among the two main vertical frames _10a1 , _10a2 , and a second caster portion ₅₂ which is a non-connecting side caster portion provided at a lower end of the main vertical frame _10a2 which is a non-connecting side main vertical frame on the side to which the auxiliary board body 30 is not connected among the two main vertical frames 10a1, _10a2 . The auxiliary board body 30 is connected to the two auxiliary vertical frames _30a1 , 30a2. The auxiliary vertical frame 30a has a third caster portion 53 which is an auxiliary caster portion provided at the lower end of the auxiliary vertical frame 30a ₁ on the opposite side of the main board body 10 among _{the two} caster portions 30a 1 and 30b. The third caster portion 53 which is an auxiliary caster portion is disposed inside a ground contact area N surrounded by the ground contact portion of the first caster portion 51 which is the connecting side caster portion and the ground contact portion of the second caster portion 52 which is the non-connecting side caster portion.

With this configuration, when the auxiliary board body 30 is moved in a folded state relative to the main board body 10, the third caster portion 53 is positioned inside the ground contact area N between the first caster portion 51 and the second caster portion 52. Therefore, by moving the main board body 10 with the folded auxiliary board body 30 with the first caster portion 51, which has the smaller ground contact width of the first caster portion 51 and the second caster portion 52, positioned forward, the running performance of the writing board can be improved.

In the writing board 1 of this 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 .

With this configuration, the contact width of the first caster portion 51 and the second caster portion 52 is relatively large, improving stability when the auxiliary board body 30 is moved in a folded state relative to the main board body 10.

In the writing board 1 of this embodiment, the horizontal leg frames 61, 62 each have a central mounting 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 arranged on both longitudinal sides of the central mounting portions 61a, 62a, and the two mounting end portions 61c, 62c are each arranged higher than the central mounting portions 61a, 62a and support the casters 61A, 62A on their undersides.

With this configuration, the center of gravity of the entire writing board becomes high when the casters 61A, 62A are supported on the lower surface of the horizontal leg frame extending linearly along the horizontal direction, but by making the height of the mounting center parts _61a , 62a supporting the lower ends of the main vertical frames 10a1, _10a2 lower than the height of the mounting center parts 61c, 62c to which the casters 61A, 62A are attached, it is possible to lower the center of gravity of the entire writing board 1. This makes it less likely for the writing board 1 to tip over.

In the writing board 1 of this embodiment, the ground contact width T1 of the first caster part 51, which is the connecting side caster part, is smaller than the ground contact width T2 of the second caster part 52, which is the non-connecting 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 connecting side caster part.

With this configuration, when the auxiliary board body 30 is folded relative to the main board body 10, the third caster portion 53 can be reliably positioned inside the contact area N surrounded by the first caster portion 51 located in front of the main board body 10 and the second caster portion 52 located behind the main board body 10.

In the writing board 1 of this embodiment, the third caster portion 53, which is the auxiliary caster portion, is composed of one caster 63A attached to the lower end of the auxiliary vertical frame _30a1 .

With this configuration, the number of parts can be reduced compared to when the third caster section 53 has two casters 63A.

Second Embodiment
The writing board 101 of this embodiment differs from the writing board 1 of the first embodiment mainly in that the writing board 1 has one auxiliary board body 30 arranged on one side of the main board body 10, whereas the writing board 101 has two auxiliary board bodies 30, 130 arranged on both sides of the main board body 10. Note that detailed description of parts of the configuration of the writing board 101 of this embodiment that are similar to the configuration of the writing board 1 will be omitted.

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

A connecting member 120 such as a hinge is attached to the boundary between the main board body 10 and the auxiliary board body 130 in a symmetrical orientation. Therefore, the auxiliary board body 130 is configured to be foldable relative to the main board body 10.

A second caster portion 52 is provided at the lower end of the main vertical frame _10a2 (connecting side main vertical frame _10a2 ) to which 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-connecting side main vertical frame _10a1 ) to which the auxiliary board body 130 is not connected among the two main vertical frames _10a1 , _10a2 .

The auxiliary board main body 130 is a plate-like member similar to the auxiliary board main body 30, and has two auxiliary vertical frames _130a1 , _130a2 , an upper frame _130b1 and a lower frame 130b2 respectively provided across the upper and lower ends of _{the two auxiliary vertical frames 130a1, 130a2 , and} a whiteboard 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 periphery of the auxiliary board main body 130, and the whiteboard 130c is disposed inside thereof.

The lower end of the auxiliary vertical frame _130a1 of the auxiliary board main body 130 is disposed lower than the lower ends of the lower frame _{130b2 and} the whiteboard _130c , and the lower end of the auxiliary vertical frame 130a2 is disposed at approximately the same height as the lower ends of the lower frame _130b2 and the whiteboard 130c. Of the two auxiliary vertical frames 130a1, _130a2 , the auxiliary vertical frame 130a1 on the opposite side to the main board main body ₁₀ is provided with a third caster portion 153 at its lower end. 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 main body 30.

When the writing board 101 is moved, as shown in FIG. 11, the auxiliary board body 30 is folded relative to the main board body 10 so that the surface of the whiteboard 10c faces closely to the surface of the whiteboard 30c, and the auxiliary board body 130 is folded relative to the main board body 10 so that the back surface of the whiteboard 10c faces closely to the back surface of the whiteboard 130c. In this way, when the writing board 101 is moved, it is usually moved with the auxiliary board body 30 and the auxiliary board body 130 folded relative to the main board body 10, with the first caster portion 51 of the main board body 10 positioned forward and the second caster portion 52 positioned backward.

In the writing board 101 of this embodiment, the main board body 10 and the auxiliary board body 30 are similar to the first embodiment in that the ground contact width T1 of the first caster part 51, which is the connecting side caster part, and the ground contact width T2 of the second caster part 52, which is the non-connecting side caster part, are different, 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-connecting side caster part. In detail, the ground contact width T1 of the first caster part 51, which is the connecting side caster part, is smaller than the ground contact width T2 of the second caster part 52, which is the non-connecting 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 connecting side caster part.

In addition, in the writing board 101 of this embodiment, the main board body 10 and the auxiliary board body 130 have a ground contact width T2 of the second caster part 52, which is the connecting side caster part, and a ground contact width T1 of the first caster part 51, which is the non-connecting side caster part, and the ground contact width T3 of the third caster part 153, which is the auxiliary caster part, is smaller than the ground contact width T1 of the first caster part 51, which is the non-connecting side caster part. In detail, the ground contact width T2 of the second caster part 52, which is the connecting side caster part, is larger than the ground contact width T1 of the first caster part 51, which is the non-connecting 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 non-connecting side caster part.

Figure 12 shows the normal movement state of the writing board 110 (moving to the right in Figure 12), where the wheels of the two casters 61A, the two casters 62A, and the one caster 63A are arranged approximately parallel to the surface of the whiteboard 10c, 30c. As described above, since the ground contact width T1 of the first caster part 51 is smaller than the ground contact width T2 of the second caster part 52, the ground contact area N (area surrounded by a dashed line in Figure 12) between the first caster part 51 and the second caster part 52 is an approximately trapezoidal area. The ground contact area N is an area surrounded by the outer ends of the parts where the wheels of the two casters 61A are in contact with the installation surface and the outer ends of the parts where the wheels of the two casters 62A are in contact with the installation surface. In this way, when the auxiliary board body 30 is folded relative to the main board body 10, the third caster portion 53 is positioned 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 positioned inside the ground contact area N between the first caster portion 51 and the second caster portion 52.

The writing board 101 of this embodiment provides the same effects as the writing board 1 of the first embodiment.

The above describes an embodiment of the present invention, but the configuration of this embodiment is not limited to the above, and various modifications are possible.

For example, in the first embodiment, the ground contact width T1 of the first caster part 51, which is the connecting side caster part, is smaller than the ground contact width T2 of the second caster part 52, which is the non-connecting 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 connecting side caster part, but this is not limited to the above. In the first embodiment, the same effect can be obtained when the ground contact width T1 of the first caster part 51, which is the connecting side caster part, is different from the ground contact width T2 of the second caster part 52, which is the non-connecting 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-connecting side caster part. This point is also the same for the second embodiment.

In the first embodiment, the third caster portion 53 is configured with one caster 63A attached to the lower end of the auxiliary vertical frame 30a- ₁ , but is not limited thereto. The third caster portion 53 may have a horizontal leg frame attached to the lower end of the auxiliary vertical frame 30a- ₁ and two casters 61A attached to the vicinity of both ends of the horizontal leg frame, similar to the first caster portion 51 and the second caster portion 52. The same applies to the third caster portion 53, 153 of the second embodiment.

In the first embodiment, the horizontal leg frames 61, 62 are arranged above the central mounting parts 61a, 62a and have two mounting ends 61c, 62c that support the casters 61A, 62A on their undersides, but this is not limited to the above. For example, the horizontal leg frames 61, 62 may each extend along the horizontal direction (the central mounting parts 61a, 62a and the two mounting ends 61c, 62c are at the same height), and the casters 61A, 62A may be attached below them. This is also true for the second embodiment.

In the first embodiment, the whiteboards 10c and 30c have writable surfaces on both the front and back sides, but they may have writable surfaces on only the front or back side. This is also true for the second embodiment.

Other configurations may also be modified in various ways without departing from the spirit of the present invention.

1 Writing board 10 Board body 10a ₁ Main vertical frame (connecting side main vertical frame; non-connecting side main vertical frame)
10a ₂ main vertical frame (non-connecting side main vertical frame; connecting side main vertical frame)
30 Auxiliary board body _30a1 , _30a2 Auxiliary vertical frame 51 First caster portion (connecting side caster portion; non-connecting side caster portion)
52 Second caster part (non-connecting side caster part; connecting side caster part)
53 Third caster part (auxiliary caster part)
61, 62 Horizontal leg frames 61a, 62a Mounting central portion 61c, 62c Mounting end portion 61A, 62A, 63A Caster 101 Writing board 130 Auxiliary board main body 130a ₁ , 130a ₂ Auxiliary vertical frame 153 Third caster portion (auxiliary caster portion)
163A Caster
N Ground contact area T1 Ground contact width of first caster portion 51 T2 Ground contact width of second caster portion 52 T3 Ground contact width of third caster portion 53

Claims (6)

a main board body having a writable use surface disposed between two main vertical frames;
an auxiliary board body foldably connected to the main board body and having a writable usable surface disposed between two auxiliary vertical frames;
The main board body has a connecting side caster portion provided at a lower end of a 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 a lower end of a 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 a lower end of the auxiliary vertical frame that is on the opposite side to the main board body out of the two auxiliary vertical frames,
A writing board characterized in that the ground contact width of the connecting side caster parts and the ground contact width of the non-connecting side caster parts are different, and the ground contact width of the auxiliary caster parts is smaller than the ground contact width of the non-connecting side caster parts. a main board body having a writable use surface disposed between two main vertical frames;
an auxiliary board body foldably connected to the main board body and having a writable usable surface disposed between two auxiliary vertical frames;
The main board body has a connecting side caster portion provided at a lower end of a 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 a lower end of a 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 a lower end of the auxiliary vertical frame that is on the opposite side to the main board body out of the two auxiliary vertical frames,
The ground contact width of the connecting side caster part is different from the ground contact width of the non-connecting side caster part,
A writing board characterized in that, when the auxiliary board body is folded relative to the main board body, the auxiliary caster parts are positioned inside the grounding area surrounded by the grounding parts of the connecting side caster parts and the grounding parts of the non-connecting side caster parts. The writing board according to claim 1 or 2, characterized in that the connecting side caster part and the non-connecting side caster part each have two casters provided at both ends of a horizontal leg frame attached to the lower end of the main vertical frame. The horizontal leg frame is
a central mounting portion to which the lower end of the main vertical frame is attached;
and two mounting end portions disposed on either side of the mounting central portion in the longitudinal direction,
4. The writing board according to claim 3, wherein the two mounting ends are disposed above the mounting center portion and support the casters on their lower surfaces. The ground contact width of the connecting side caster part is smaller than the ground contact width of the non-connecting side caster part,
5. The writing board according to claim 1, wherein the ground contact width of the auxiliary caster portion is smaller than the ground contact width of the connecting caster portion. The writing board according to any one of claims 1 to 5, characterized in that the auxiliary caster portion is composed of one caster attached to the lower end of the auxiliary vertical frame.

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