JP2012024954A - Blackboard device, and connector used for the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable the mechanical strength of a folded part of a pipe to be fully exhibited.SOLUTION: Gripping surfaces 36 are formed in the shape of U in cross section to grip a surface 37 to be gripped of a second joint 35 at connecting ends 33 of a pair of first joints 30. The gripping surfaces 36 of the first joint 30 and the surface 37 to be gripped of the second joint 35 are each formed radially from the center at a constant pitch and are formed in meshing surfaces 50 which can be meshed with each other. While the gripping surfaces 36 of the first joint 30 and the surface 37 to be gripped of the second joint 35 are meshed with a desired angle, the second joint 35 is gripped between the one pair of first joints 30. Each of the first joint 30 and the second joint 35 is inserted into either a vertical protruding part 6 or a first horizontal protruding part 7, so that the second joint 35 can be fixed to the first joint 30 in a state where a predetermined angle is maintained.

Description

  The present invention relates to a blackboard device that includes a projection device and a screen, and that can project an image from the projection device onto the screen, and a connector used therefor.

  A blackboard device has been developed in which a screen is provided on a blackboard, and an image can be projected on the screen by a projector (see Patent Document 1). For example, in the blackboard device 90 shown in FIG. 20, a screen 94 is developed on the front surface of the blackboard 91, and an image projected from the projector PJ suspended above the blackboard 91 via the arm 95 in front of the blackboard 91 is It is displayed on the screen 94. In addition to deploying a screen on a blackboard fixed to the wall surface of the room as a blackboard, a screen on the board is also applied to a mobile board that can be moved by a caster as a self-supporting blackboard or whiteboard. A mobile board has been developed that can be expanded and projected with a projector (see Patent Document 2). For example, in the blackboard device 90B shown in FIG. 21, a screen 94 is developed on the front surface of a whiteboard 91B that can be moved by a caster 93, and the projector is suspended through an arm 95 protruding forward from above the whiteboard 91B. An image from the PJ is displayed on the screen 94. Hereinafter, these are collectively referred to as a blackboard device.

JP 2010-155401 A JP 2003-341289 A

  In such a blackboard device, a structure for fixing the projector, such as an arm, is essential. In general, a projector has a certain amount of weight and is preferably fixed to the ceiling because it can project more brightly by being provided above the observer's head. However, since the fixing work to the ceiling is troublesome, in the above-described blackboard apparatus, the projector is previously fixed above the blackboard or whiteboard (hereinafter also referred to as “board”). However, in order to stably support a projector having a heavy weight, sufficient mechanical strength is required, so that the supporting structure becomes larger and heavier, such as a thicker and larger pipe for supporting. It was not easy to realize a blackboard device that was easy to move.

  In particular, when the projector is fixed to the upper surface of the board, the fixing structure is relatively easy. However, in this method, as shown in the blackboard devices 90C and 90D shown in FIGS. There is a problem that the brightness of the image projected by the projector PJ is halved by reflection, and the image is also shaken when the mirror 92 is shaken by vibration or the like, and the image quality is lowered.

  For this reason, as shown in FIGS. 20 and 21, it is bright and high to adopt a system in which the projector itself is fixed in a posture that protrudes in front of the board and is directly projected from the projector onto the screen developed on the board. This is advantageous in terms of providing quality images.

  However, this method requires a structure in which the projector is suspended in front of the board, and there is a problem that a mechanical support structure is not easy. In particular, the metal pipe that realizes the support structure is bent in a complicated manner, so the pipe is fixed with screws etc., but the strength at the bent part of the pipe may be insufficient, and sufficient mechanical strength There has been a demand for a structure that can hold the projector with the right angle.

  The present invention has been made to solve such conventional problems. A main object of the present invention is to provide a blackboard device and a connector used therefor that can sufficiently maintain the mechanical strength of a bent portion of a pipe.

Means for Solving the Problems and Effects of the Invention

  According to the blackboard device according to the first aspect of the present invention, the main blackboard 1, the projection device PJ for projecting an image on the main surface of the main blackboard 1, and the projection device PJ of the main blackboard 1 A blackboard device including a fixing pipe 5 for fixing upward, wherein the fixing pipe 5 includes a vertical protrusion 6 protruding upward from an upper part of the main blackboard 1 and the vertical protrusion 6. And a first horizontal protrusion 7 that is bent in a horizontal posture and fixes the projection device PJ to the tip, and the blackboard device further includes the vertical protrusion 6, the first horizontal protrusion 7, And a pair of first joints 30 each having an insertion end 34 to be inserted into either the vertical protrusion 6 or the first horizontal protrusion 7. And either the first horizontal protrusion 7 or the vertical protrusion 6 on the other The first joint 30 and the second joint 35 are the opposite edges of the insertion end 34, respectively, and the first joint 30 and the second joint 35 are provided. A connection end 33 for connecting the two joints 35 is provided, and the second joint 35 is sandwiched between the pair of first joints 30 at the connection surface 33 so as to be sandwiched between the pair of first joints 30. Each of the pair of first joints 30 is provided with a holding surface 36 for holding the held surface 37 at the connection end 33, and the pair of first joints. In the state where 30 is joined, in order to pinch the pinched surface 37 of the second joint 35 at the connecting end 33, the pinching surface 36 is formed in a U shape in cross section, First jo The pinching surface 36 of the joint 30 and the pinched surface 37 of the second joint 35 are formed at a constant pitch radially from the center, and are formed on a mating surface 50 that can mesh with each other. In a state where the sandwiching surface 36 of the first joint 30 and the sandwiched surface 37 of the second joint 35 are meshed at a desired angle, the pair of first joints 30 is connected to the second joint 35. The first joint 30 and the second joint 35 are respectively inserted into either the vertical projecting portion 6 or the first horizontal projecting portion 7, and the second joint 35 is connected to the first joint 30. And can be fixed while maintaining the predetermined angle. As a result, a structure for bending and fixing the fixed pipe can be held very easily in a state bent at a desired angle, and a support structure that can be bent while exhibiting sufficient mechanical strength is realized.

  Moreover, according to the blackboard apparatus which concerns on a 2nd side surface, the said meshing surface 50 can be formed in cross-sectional view uneven | corrugated strip or a saw blade shape. Thereby, the resistance against rotation and twisting can be exhibited by the contact surface formed in a concave-convex shape or a saw blade shape on the meshing surface.

  Further, according to the blackboard device according to the third aspect, the open end edge 43 of the vertical protrusion 6 and / or the first horizontal protrusion 7 connected to the connection end 33 of the connector 9 is formed in a hollow cylindrical shape. The connecting end 33 of the connecting tool 9 can be formed into a rod shape that can be inserted into the hollow cylindrical shape, and the contact surface between the hollow cylindrical shape and the rod shape can be formed into an uneven strip. As a result, the rod shape inserted into the hollow cylindrical shape is prevented from rotating on the inner surface of the hollow cylindrical shape by the concave and convex ridges, and can sufficiently exhibit the resistance to the twisting direction of the fixed pipe, and these are securely held in a connected state. The advantage that it can be fixed is obtained.

  Furthermore, according to the blackboard device according to the fourth aspect, the vertical projecting portion 6 and the first horizontal projecting portion 7 are formed in a pipe shape having an open edge, and the pipe-shaped opening edge. The first concave and convex portions 41 each having a gear shape in section are formed on the inner surface of 43, and the outer surfaces of the insertion ends 34 of the first joint 30 and the second joint 35 are in mesh with the first concave and convex portions 41. The second uneven strip 42 can be formed. Thereby, at the connection interface between the pipe-shaped opening end edge and the insertion end, the situation of rotating after the connection can be effectively prevented with a simple structure, and a stable support structure can be obtained.

  Furthermore, according to the blackboard device according to the fifth aspect, the vertical protrusion 6 is arranged on the back side of the main blackboard 1 and protrudes not only from above but also from below the main blackboard 1. Furthermore, the lower end of the vertical protrusion 6 is provided with a second horizontal protrusion 8 that protrudes on the opposite side of the protrusion direction of the first horizontal protrusion 7, and the second horizontal protrusion A weight WT that can be balanced with the weight of the projection device PJ fixed to the tip of the first horizontal protrusion 7 can be fixed to the tip of the portion 8. This allows the projection device to be balanced by placing a weight on the opposite side with the projection device that is a heavy object protruding forward from the upper side of the main blackboard. It will be advantageous.

  Furthermore, according to the blackboard device according to the sixth aspect, the vertical protrusion 6 can be pivotably fixed on the back surface of the main blackboard 1. Thereby, it becomes possible to swing the projection apparatus in front of the main blackboard, and there is an advantage that the projection apparatus can be positioned to the side and placed in the storage state when not in use.

  Furthermore, according to the blackboard device according to the seventh aspect, the fixed pipe 5 can be formed in a columnar shape. This provides an advantage that the user can easily hold and rotate the fixed pipe by hand.

  Furthermore, according to the blackboard device according to the eighth aspect, the fixed pipe 5 is formed in a hollow shape, and the first joint 30 and the second joint 35 each form a space therein, and In a state where the vertical projecting portion 6 and the first horizontal projecting portion 7 are connected via the connector 9 constituted by the first joint 30 and the second joint 35, the hollow shape of the fixed pipe 5 and the The internal space of the first joint 30 and the second joint 35 can be configured to communicate with each other. As a result, when the fixing pipes for fixing the projection apparatus are fixed in a bent state, the hollow spaces are communicated with each other via the coupling tool. It can be inserted. As a result, the electric wiring of the projection apparatus via the fixed pipe is possible, the cable and harnesses are not exposed to the outside, the appearance can be refreshed, and the trouble due to wiring trouble and catching can be avoided. In particular, the ability to simplify the electrical connection between the projection apparatus and a signal source such as a personal computer in an educational institution is extremely advantageous from the viewpoint of improving usability.

  Furthermore, according to the blackboard device according to the ninth aspect, at one edge of the first joint 30 and the second joint 35 provided with the sandwiching surface 36 and the sandwiched surface 37 for connecting to each other. A semicircular protrusion that is formed in a semicircular shape and protrudes from the tips of the first joint 30 and the second joint 35, and radially from a substantially circular center of the semicircular protrusion. The meshing surface 50 is formed, and the first joint 30 and the sandwiched surface 37 of the second joint 35 and the sandwiched surface 37 are engaged with each other by a semicircular projecting portion. Inserting the pinching surface 36 and the pinched surface 37 of the joint 30 and the second joint 35 into the pipe-shaped end edges of the vertical projecting portion 6 and the first horizontal projecting portion 7, respectively, while maintaining the connected state Can be fixed. As a result, the connecting pipes can be securely fixed to each other in a bent posture while having a simple structure, and an advantage that a heavy object such as a projection device of a blackboard device can be stably held can be obtained.

  Furthermore, according to the blackboard device according to the tenth aspect, the pair of first joints 30 can be formed in different shapes. In this way, by forming the first joint asymmetrically and forming one of the first joints in a large size, it is possible to increase the continuous molding portion in the connection portion with the fixed pipe and the second joint, and to increase the rigidity.

  Furthermore, according to the blackboard device according to the eleventh aspect, one of the pair of first joints 30 is a first sub-joint 31, the other is a second sub-joint 32, and The insertion end 34 side is formed in a size of a semicircle or more in a cross-sectional view, and the insertion end 34 side of the second sub-joint 32 is formed in a size of a semicircle or less in a cross-sectional view. In a state where the sub joint 31 and the second sub joint 32 are joined to form the first joint 30, the first sub joint 31 is configured such that the insertion end 34 of the first joint 30 is substantially circular in a cross-sectional view. In addition, the insertion end 34 side of the second sub-joint 32 is formed in a complementary manner, and the connection end 33 side of the first sub-joint 31 is substantially L-shaped. On the other hand, the connection end 33 side of the second sub-joint 32 is formed in a substantially flat plate shape, and the first sub-joint 31 and the second sub-joint 32 are joined together, By overlapping the substantially flat plate shape of the second sub-joint 32 on the substantially L-shape of the one sub-joint 31, the connection end 33 having a U-shaped cross-sectional view can be formed. Accordingly, the insertion of the first sub-joint and the second sub-joint can be facilitated, the insertion end 34 side can be formed in a circular shape, and the connection end 33 side can be formed in a U-shape in cross-sectional view. By forming one sub-joint larger than the second sub-joint, it is possible to increase the rigidity against torsion and the like. In addition, the first sub-joint formed to have a semi-circular cross section can easily hold a wiring cable or the like at the time of assembly, and an advantage of improving workability can be obtained. In particular, in the configuration in which the first joint is divided into two in the vertical direction, it is difficult to hold the cables when they are inserted into the first joint if they are equally divided left and right. Therefore, as described above, by making the first sub-joint larger than a semicircle, it is easy to hold the cables in the first sub-joint even before joining, and there is an advantage that it is easy to set the cable during assembly work. It is done.

  Furthermore, according to the blackboard device according to the twelfth aspect, the screen body 4 is further arranged on the main surface of the main blackboard 1, and the projection device PJ is arranged on the main surface of the main blackboard 1. An image can be projected onto the screen body 4 thus formed. Thereby, the projection image of the projection device can be clearly displayed on the screen body.

  Furthermore, according to the blackboard device according to the thirteenth aspect, the screen body 4 is of a winding type and can be developed on the main blackboard 1 and can be wound up and stored when not in use. Thereby, since the screen body can be wound and stored when not in use, there is an advantage that it can be efficiently used when writing on the main blackboard.

  Furthermore, according to the blackboard device according to the fourteenth aspect, the blackboard device further includes a moving body 10 slidably connected along the main surface of the main blackboard 1, and the screen body 4 includes: The screen body 4 is provided on the moving body 10 and can be developed at a desired position on the main surface of the main blackboard 1. Thereby, the position which arrange | positions a screen body to a main blackboard can be adjusted freely, the arrangement position of a screen body can be changed according to the board writing etc. of a main blackboard, and the advantage which can improve usability is acquired.

  Furthermore, according to the blackboard device according to the fifteenth aspect, the main blackboard 1 can be fixed to the wall surface WL. Thereby, the folding structure of the fixed pipe can be easily realized even in the fixed blackboard.

  Furthermore, the blackboard device according to the sixteenth aspect further comprises a frame body 2 that holds the main blackboard 1 in a self-supporting state, and a movable caster 3 that is fixed to the lower surface of the frame body 2. Can do. Thereby, in a movable self-supporting blackboard apparatus, the fixing structure of connection pipes can be simplified.

  Furthermore, according to the blackboard device according to the seventeenth aspect, the vertical protrusion 6 is arranged on the back side of the main blackboard 1 and protrudes not only from above but also from below the main blackboard 1. Furthermore, the lower end of the vertical protrusion 6 is provided with a second horizontal protrusion 8 that protrudes on the opposite side of the protrusion direction of the first horizontal protrusion 7, and the second horizontal protrusion The caster 3 can be fixed to the portion 8. Thereby, in a movable self-supporting blackboard apparatus, the fixing structure of connection pipes can be simplified.

  Furthermore, according to the blackboard device according to the eighteenth aspect, the main blackboard 1 can be a whiteboard.

  Furthermore, according to the connection tool according to the nineteenth aspect, there is provided a connection tool 9 for connecting the first fixed pipe and the second fixed pipe, which is either the first fixed pipe or the second fixed pipe. A pair of first joints 30 having an insertion end 34 inserted into one of them, and a second joint 35 having an insertion end 34 inserted into either the second fixed pipe or the first fixed pipe. Each of the first joint 30 and the second joint 35 is provided with a connecting end 33 for connecting the first joint 30 and the second joint 35 at an edge opposite to the insertion end 34, respectively. The second joint 35 includes a sandwiched surface 37 on an opposing surface so that the second joint 35 is sandwiched between the pair of first joints 30 at the connection end 33, and the pair of first joints 30 is connected to the connection end 33. 3, each of which includes a sandwiching surface 36 for sandwiching the sandwiched surface 37, and the pair of first joints 30 are joined to each other at the connection end 33. In order to sandwich the sandwiched surface 37 of the two joints 35, the sandwiching surface 36 is formed in a U shape in cross section, and the sandwiching surface 36 of the first joint 30 and the second joint 35 are The sandwiched surfaces 37 are formed radially at a constant pitch from the center, and are formed on the meshing surfaces 50 that can mesh with each other. The sandwiched surface 36 of the first joint 30 and the second joint 30 The pair of first joints 30 are sandwiched between the pair of first joints 30 in a state where the sandwiched surfaces 37 of the 35 are meshed with each other at a desired angle. Respectively, They are respectively inserted into either the pipe or the second fixed pipe, the second joint 35 can be fixably configuration while maintaining the predetermined angle with respect to the first joint 30. As a result, a structure for bending and fixing the fixed pipe can be held very easily in a state bent at a desired angle, and a support structure that can be bent while exhibiting sufficient mechanical strength is realized.

  Furthermore, according to the connecting tool according to the twentieth aspect, the connecting end 33 of the connecting tool 9 is connected to the connecting end 33 of the connecting tool 9 of the first fixed pipe and / or the second fixed pipe. The hollow cylindrical opening end edge 43 can be inserted into a bar shape, and the contact surface between the hollow cylindrical shape and the bar shape can be formed on an uneven surface. As a result, the rod shape inserted into the hollow cylindrical shape is prevented from rotating on the inner surface of the hollow cylindrical shape by the concave and convex ridges, and can sufficiently exhibit the resistance to the twisting direction of the fixed pipe, and these are securely held in a connected state. The advantage that it can be fixed is obtained.

  Furthermore, according to the connector according to the twenty-first aspect, the first fixed pipe and the second fixed pipe are formed in a pipe shape having an open end edge, and the pipe-shaped open end edge 43 is A first concave and convex strip 41 having a gear shape in cross section is formed on the inner surface, and a second meshed with the first concave and convex strip 41 is formed on the outer surface of the insertion end 34 of the first joint 30 and the second joint 35. Asperities 42 can be formed. Thereby, at the connection interface between the pipe-shaped opening end edge and the insertion end, the situation of rotating after the connection can be effectively prevented with a simple structure, and a stable support structure can be obtained.

  Furthermore, according to the connecting tool according to the twenty-second aspect, the end edge is a hollow cylindrical opening end edge 43, and the first concave and convex portion 41 having a gear shape in section is formed on the inner surface in the extending direction. A connecting tool 9 for connecting fixed pipes, which is made of a cylindrical metal having a hollow inside, is bent at a predetermined angle, and is inserted into the fixed pipe at both ends. The insertion end 34 has an outer diameter that can be inserted into the inner surface of the opening edge 43, and the outer surface of the insertion end 34 includes the first uneven strip 41 and the teeth. The 2nd uneven | corrugated strip 42 to match | combine can be formed in an extension direction. This makes it easy to connect the fixed pipes in a bent state by using a connector that is bent in advance, and meshes the second concavo-convex strip of the insertion end with the first concavo-convex strip of the fixed pipe. Thus, it is possible to obtain a strong connection structure in which rotation on the connection surface is prevented and rigidity in the twisting direction is increased. In particular, the cylindrical pipe has the highest rigidity in the rotation direction, and the effect of further increasing the strength of the metal pipe can be expected due to the fact that the side surface is provided with the ridges along the extending direction.

  Furthermore, according to the connector according to the twenty-first aspect, the bending angle can be approximately 90 °. As a result, it is possible to easily realize the bending of the fixed pipe having a substantially right angle, which is frequently used, and to increase the rigidity against torsion.

It is a perspective view of the blackboard apparatus which concerns on Example 1 of this invention. In FIG. 1, it is a perspective view which shows the state which turned the vertical protrusion part. It is the side view which looked at the blackboard apparatus of FIG. 1 from the side. It is the top view which looked at the blackboard apparatus of FIG. 1 from the upper surface. In FIG. 4, it is a top view which shows the state which turned the vertical protrusion part. It is a perspective view which shows the fixed pipe part of the blackboard apparatus of FIG. It is an enlarged view which shows the coupling tool which connects the fixed pipes of FIG. 8A (a) is a schematic view of the connector of FIG. 7 as viewed from above, and FIG. 8 A (b) is a schematic view of the connector of FIG. 7 as viewed from the right side. FIG. 8B is a front view, FIG. 8B (b) is a front view, FIG. 8B (c) is a bottom view, and FIG. 8B (d) is a left side view. 8B (e) is a right side view, and FIG. 8B (f) is a rear view. It is a disassembled perspective view of the coupling tool of FIG. It is the disassembled perspective view which looked at FIG. 9 from the back side. FIG. 11 (a) is a front view, FIG. 11 (b) is a front view, FIG. 11 (c) is a bottom view, and FIG. 11 (d) is a left side view. 11 (e) is a right side view, and FIG. 11 (f) is a rear view. FIG. 12 (a) is a front view, FIG. 12 (b) is a front view, FIG. 12 (c) is a bottom view, and FIG. 12 (d) is a left side view. 12 (e) is a right side view, and FIG. 12 (f) is a rear view. FIG. 13 (a) is a front view, FIG. 13 (b) is a front view, FIG. 13 (c) is a bottom view, FIG. 13 (d) is a left side view, and FIG. FIG. 13E is a right side view, and FIG. 13F is a rear view. It is a perspective view which shows the coupling tool which concerns on a modification. It is a top view of the coupling tool shown in FIG. It is an external appearance perspective view which shows the blackboard apparatus which concerns on Example 2. FIG. It is a perspective view which shows the state which accommodates a projection apparatus in FIG. It is a schematic cross section of FIG. It is a perspective view which shows the blackboard apparatus which concerns on Example 3. FIG. It is a schematic diagram which shows the blackboard apparatus which can project an image on a screen with a projector. It is a schematic diagram which shows the blackboard apparatus which can project an image with a projector on a self-supporting white board. It is a schematic diagram which shows the system which fixes a projector on the board upper surface, reflects it with a mirror, and projects on a board surface. It is a schematic diagram showing a system in which the projector is fixed in a posture protruding from the front of the board and projected directly onto the screen developed on the board from the projector.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. However, the embodiment described below exemplifies a blackboard device and a connector used therefor for embodying the technical idea of the present invention, and the present invention is a blackboard device and a connector used therefor. Is not specified as below. In addition, the member shown by the claim is not what specifies the member of embodiment. In particular, the dimensions, materials, shapes, relative arrangements, and the like of the constituent members described in the embodiments are not intended to limit the scope of the present invention only to the description unless otherwise specified. It's just an example. Note that the size, positional relationship, and the like of the members shown in each drawing may be exaggerated for clarity of explanation. Furthermore, in the following description, the same name and symbol indicate the same or the same members, and detailed description thereof will be omitted as appropriate. Furthermore, each element constituting the present invention may be configured such that a plurality of elements are constituted by the same member and the plurality of elements are shared by one member, and conversely, the function of one member is constituted by a plurality of members. It can also be realized by sharing. In addition, the contents described in some examples and embodiments may be used in other examples and embodiments.
Example 1

  A blackboard device according to Embodiment 1 of the present invention will be described with reference to FIGS. In these drawings, FIG. 1 is a perspective view of the blackboard device 100 according to the first embodiment of the present invention, FIG. 2 is a perspective view showing a state in which the vertical protrusion 6 is turned in FIG. 1, and FIG. 4 is a plan view of the blackboard device 100 as viewed from above, FIG. 5 is a plan view of the blackboard device 100 as viewed from above, and FIG. 6 is a perspective view showing a fixed pipe portion of the blackboard device 100 of FIG. 1, FIG. 7 is an enlarged view showing a connector 9 for connecting the fixed pipes of FIG. 6, and FIG. 8A (a) is a connector 9 of FIG. 8A (b) is a schematic view of the connector 9 of FIG. 7 viewed from the right side, and FIG. 8B is a six-face view of the connector 9 of FIG. ) Is a front view, FIG. 8B (b) is a front view, FIG. 8B (c) is a bottom view, FIG. 8B (d) is a left side view, and FIG. 8B (e) is a right side view. B (f) is a rear view, FIG. 9 is an exploded perspective view of the connector 9 of FIG. 7, FIG. 10 is an exploded perspective view of FIG. 9 viewed from the rear side, and FIG. 11 (a) is a front view, FIG. 11 (b) is a front view, FIG. 11 (c) is a bottom view, FIG. 11 (d) is a left side view, and FIG. 11 (e). Is a right side view, FIG. 11 (f) is a rear view, FIG. 12 is a six-side view of the second sub-joint 32, FIG. 12 (a) is a front view, and FIG. 12 (b) is a front view. 12 (c) is a bottom view, FIG. 12 (d) is a left side view, FIG. 12 (e) is a right side view, and FIG. 12 (f) is a rear view. FIG. 13 (a) is a front view, FIG. 13 (b) is a front view, FIG. 13 (c) is a bottom view, FIG. 13 (d) is a left side view, and FIG. (E Is a right side view, FIG. 13 (f) is a rear view, respectively. The blackboard device 100 shown in these drawings includes a frame body 2, a main blackboard 1 fixed to the frame body 2, a moving body 10 that is slidably connected along the main surface of the main blackboard 1, A screen body 4 that can be rolled up from the moving body 10, a projection device PJ for projecting an image on the screen body 4, and a fixing pipe 5 for fixing the projection device PJ above the main blackboard 1. I have. The fixed pipe 5 is fixed to the vertical protrusion 6 (corresponding to the first fixed pipe) that is pivotally fixed to the frame body 2, and is fixed so as to extend horizontally from the upper end of the vertical protrusion 6. The first horizontal protrusion 7 (corresponding to the second fixed pipe) for fixing the second horizontal protrusion fixed horizontally so as to extend in the opposite direction to the first horizontal protrusion 7 from the upper end of the vertical protrusion 6 Part 8. In particular, the vertical protruding portion 6 has an upper end protruding upward from the upper portion of the main blackboard 1 and a lower end protruding downward from the lower portion of the main blackboard 1. The vertical protrusion 6, the first horizontal protrusion 7, and the second horizontal protrusion 8 are each fixed by a connector 9. The frame body 2 is a framework for fixing the main blackboard, and is composed of a metal square or the like. A caster 3 is fixed to the lower surface of the frame body 2. The caster 3 is a wheel that can rotate in a horizontal plane, whereby the frame body 3 can be moved freely.

  The blackboard device 100 according to the first embodiment can project the information of the video source supply device connected to the blackboard device 100 onto the screen body 4 or the blackboard by the projection device PJ. Further, by operating the projected screen with a video source supply device capable of detecting a position, the operation is reflected on the screen via the video source supply device. The blackboard device 100 according to the first embodiment will be described below. In the present specification, the front side where the contents described in the blackboard device 100 can be visually recognized is referred to as “front”, and the back side of the blackboard device is referred to as “rear”.

  The blackboard device 100 according to the first embodiment includes a main blackboard 1 that is held in a vertical posture, and a moving body 10 that is connected to the main blackboard 1 so as to be movable along the main surface of the main blackboard 1, that is, the front surface. The movable body 10 shown in the figure is movable in the horizontal direction (left and right direction of the main blackboard 1) in a vertical posture (up and down direction of the main blackboard 1) so as to form a space between the front surface of the main blackboard 1 and It has a rod-shaped handle portion 11. The user can move the moving body 10 in the right direction by pulling or pushing the handle portion 11 in the right direction in the blackboard device 100 in the state of FIGS. Similarly, the mobile body 10 can be moved leftward by pressing the mobile body 10 leftward. That is, the moving body 10 is freely positioned in the horizontal direction within the width of the main blackboard 1.

  The moving body 10 includes an upper surface sliding plate 13 that can slide along the end surface of the main blackboard 1. The upper surface sliding plate 13 is connected to the handle portion 11 and interlocks with the handle portion 11. Accordingly, the upper surface sliding plate 13 moves substantially horizontally along the end of the main blackboard 1 as the handle portion 11 moves substantially horizontally. Further, a placing shelf portion 16 is fixed to the lower end of the handle portion 11. The storage shelf 16 can mount a personal computer PC that supplies video information to a projection device PJ that can project an image on the front side of the main blackboard 1. Accordingly, when the handle portion 11 is moved horizontally, the personal computer PC placed on the placing shelf portion 16 is also moved horizontally together with the handle portion 11 and can be moved laterally along the front surface of the main blackboard 1. As shown in FIG. 2, when the storage shelf 16 is opened from a state where the door is closed, the back surface of the door becomes a table, and a personal computer PC or the like can be placed thereon. The storage rack 16 is provided with various interfaces for connecting to the personal computer PC. Examples of such connection interfaces include a D-SUB terminal and HDMI terminal for video signals, an audio input terminal, a LAN connection terminal for network connection, a service outlet for power supply, and the like. Further, it is preferable that a cable such as a LAN cable or an HDMI cable is provided in advance on the shelf 16 so that the connection with the personal computer PC can be performed smoothly.

Furthermore, the blackboard device 100 includes a screen body 4 that can be disposed on the front surface of the main blackboard 1. The screen body 4 is a projection screen that can project a screen projected from the projection device PJ. The screen body 4 is connected to the moving body 10, and more specifically, a fixed end is attached to the handle portion 11 and interlocked with the handle portion 11. The screen body 4 in FIGS. 1 and 2 is a winding type. When disposing the screen body 4 on the main blackboard 1, the user first moves the handle portion 11 of the moving body 10 in the lateral direction, stops it at a desired position, and then pulls out the free end of the screen body 4. Thus, the screen body 4 can be disposed at a desired position on the front surface of the main blackboard 1.
(Projector PJ)

  As the projection device PJ fixed to the first horizontal protrusion 7, a projector that mainly projects an image can be used. Also, a video source supply device for supplying a video source by connecting to a projector is disposed on the shelf 16. As such a video source supply device, a personal computer PC is preferable. However, the video source supply device is not indispensable. For example, a video source built in the projection device or a video source supply device integrated with the projection device can be used. For example, a projection apparatus that stores a presentation file in a semiconductor memory, inserts it into a projector, and switches and displays the presentation file can display an image without preparing a separate image source supply device. In this specification, the video includes not only a still image but also a moving image. Further, a speaker or the like can be appropriately added to the projection device or the video source supply device. In this example, a pointing device such as a light pen, a digitizer, or a mouse can be used. Furthermore, the video source supply device and the projection device are electrically connected, but the communication means is not particularly limited, and for example, serial or parallel connection such as USB, LAN, IEEE 1339 or the like can be used. Moreover, it is good also as a wireless system not only in a wire connection. As a wireless system, an existing communication system such as a wireless LAN, RF, infrared communication, or optical communication can be used as appropriate. Further, the present invention is not limited to the exchange of information between the video source supply device and the projection device, and the power supply may be wireless or battery-driven. The wireless system is preferable because it eliminates connection cords and cables or reduces the number of cables, and is easy to handle.

  Further, the fixed position of the projection device PJ in the first horizontal protrusion 7 is set so that the focus can be made on the screen body 4 developed on the main blackboard 1. That is, the length of the first horizontal projection is selected according to the size of the projected image and the focal length of the projection device, and the projection device is fixed to the tip of the first horizontal projection. This is preferable because the user can use the projector immediately without turning on the power of the projector without adjusting the focus of the projector, and the troublesome adjustment can be eliminated.

A well-known device can be used as the projection device PJ. In the example shown in the figure, the projection device PJ is disposed on the front surface of the screen body 4 and directly projected onto the screen body 4. However, a reflective projector can also be used. In this case, the projector is fixed to the upper surface of the main blackboard, the image is reflected by the reflector fixed to the first horizontal protrusion, and the image is displayed on the screen body developed on the main blackboard. When a reflective projector is used, there is an advantage that the projector can be stably held by being fixed to the upper surface of the main blackboard without being suspended. On the other hand, when a mirror, which is a reflector, vibrates, there is a drawback that the image is easily shaken and the amount of light is relatively reduced. In either case, it is preferable to provide an angle adjustment mechanism that can adjust the projection direction of the projector PJ. The angle adjustment mechanism can include a swivel mechanism that adjusts the vertical elevation angle and the horizontal direction.
(Main Blackboard 1)

  The main blackboard 1 is a board having a main surface on which a board can be written, and a user can perform board writing using chalk or the like. Moreover, magnetic bodies, such as a magnet, can be adsorb | sucked by using metal. In addition to the so-called blackboard drawn using chalk, a whiteboard drawn using markers or the like can be used for the main blackboard 1. Thus, in this specification, “blackboard” is used as a concept including a whiteboard. When a whiteboard is used, it is possible to directly project the image of the projection device onto the whiteboard without providing a screen body separately. Even when a blackboard is used, if a necessary contrast is obtained, an image can be directly projected on the main blackboard without using a screen body. Furthermore, the screen body is not limited to a retractable storage type. Alternatively, a display device may be employed instead of or in addition to the screen body. As the display device, a large-screen liquid crystal display, a plasma display, an organic EL, an FED such as an SED, and other thin display units can be employed. The display device may be movably disposed on the main surface of the main blackboard 1. With this configuration, data from the video source supply device can be directly displayed on the display device without using a projection device separately. Alternatively, instead of the display device, a flat so-called white board may be used. Moreover, you may provide the auxiliary | assistant apparatus accommodating part which can accommodate these display apparatuses and whiteboards at the time of non-use. The auxiliary device storage section is provided in a door pocket shape on the main surface of the main blackboard 1, for example. In addition, the blackboard can be used effectively by using the front of the door-like auxiliary device storage section as a blackboard.

The main blackboard 1 has a rectangular plate shape, and in the example shown in the figure, is a horizontally elongated rectangle. The main blackboard 1 has a blackboard paint applied on the front surface so that characters and figures can be written and erased, and is a colored coated plate on which letters and figures can be written with chalk. Further, as described above, a white plate on which characters and figures can be written with erasable ink can be used. Further, a magnet can be attached to the front surface of the main blackboard 1. The main blackboard 1 to which the magnet is attached is obtained by mixing metal powder into the blackboard paint or by making the plate surface made of metal. As the metal powder to be contained in the blackboard paint, iron powder can be used, and the metal plate surface is preferably made of steel or iron enamel from the viewpoint of resistance.
(Screen body 4)

  The screen body 4 connected to the moving body 10 is a curtain for projecting characters and images. As the screen body 4, a publicly known one can be adopted, which is a translucent or opaque screen. In addition, a touch screen having an input function capable of directly touching the screen body with a finger or a light pen and transmitting the touched position as a signal to a computer can be used. Characters and figures such as tool pictures may be printed in advance on the surface of the screen body. For example, a tool box in which frequently used functions are arranged as icons can be provided on a part of the screen body. Alternatively, these tool boxes can be realized by software, and a drawing tool such as an eraser or a pen can be realized by using a function of presentation software installed in a personal computer PC.

  Moreover, the screen body 4 of FIG. 1, FIG. 2 is a screen which can be wound up as mentioned above. The screen body 4 urges the winding shaft in the winding direction around the winding shaft. The user can unfold the screen body 4 by pulling out the free end side in the horizontal direction with respect to the fixed end side of the screen body 4 in the winding state against the urging force. The development amount of the screen body 4 can be set arbitrarily.

  Further, a part of the screen body 4 can be maintained in an unfolded state. The winding shaft of the screen body 4 is connected to the second end corresponding to the fixed end of the screen body 4 (the left end in the viewing direction of the blackboard device 100), and the right end corresponding to the other end of the screen body 4 Is the free end. In the example shown in the figure, the left end of the screen body 4 and the winding shaft are connected and fixed, and the screen body 4 assumes a state of being wound in a roll shape as a basic posture. Then, the screen body 4 is unfolded by pulling the right end of the screen body 4 out of the winding shaft and moving it in the horizontal direction. As a result, the amount of expansion of the screen body 4 can be set freely according to the amount of drawing of the screen body 4. The blackboard device 100 according to the first embodiment can move the moving body 10 horizontally with respect to the main blackboard 1 and can open and close the screen body 4 in the horizontal direction with reference to the position where the main blackboard 1 is positioned. The amount of deployment can be set freely.

The blackboard device 100 according to the first embodiment may include a handle lock mechanism that substantially fixes the relative position between the handle portion 11 and the main blackboard 1. The handle lock mechanism includes a handle lock receiving body fixed to the main blackboard 1 and a handle lock engaging body fixed to the moving body 10. In the blackboard device 100, the movable body 10 is moved horizontally with respect to the main blackboard 1 by operating the handle portion 11 so that the handle lock engaging body and the handle lock receiving body 71 can be brought close to each other. When the user locks the handle lock locking body 72 and the handle lock receiving body 71, the independent horizontal movement of the moving body 10 can be suppressed, and the handle portion 11 and the members connected thereto are in a non-moving state. A push lock or the like can be suitably used as such a handle lock mechanism. The handle lock mechanism is not limited to a single one, and a plurality of handle lock mechanisms may be provided.
(Moving object 10)

The moving body 10 has a handle portion 11 that is arranged in a vertical posture away from the front surface of the main blackboard 1. The user of the blackboard device 100 can hold the handle portion 11 and pull or push it left and right. The handle portion 11 according to the first embodiment has a long and narrow bar shape, and has a length corresponding to the short side of the main blackboard 1 and takes a posture substantially parallel to the short side.
(Handle part 11)

  Further, the handle portion 11 is fixed in a posture that is separated from the front surface of the main blackboard 1 and floated on the front surface, and a storage space is provided in a gap between the handle portion 11 and the main blackboard 1. The blackboard apparatus 100 can arrange the screen body 4 in the storage state in this storage space. The screen body 4 can be stored in the storage space while being separated from the handle portion 11 of the moving body 10.

  The handle portion 11 provided with a storage space and separated from the main blackboard 1 is easily gripped by the user. Specifically, since the user of the blackboard device 100 can put his hand in the storage space and can firmly grip the outer peripheral surface of the handle portion 11, the handle portion 11 is easy to operate. In addition, the handle portion 11 that is spaced apart from the screen body 4 positioned in the storage space places a hand in the gap between the handle portion 11 and the screen body 4 even in the storage state where the screen body 4 is thickest. The handle portion 11 can be firmly gripped. The moving body 10 that can grip the outer peripheral surface of the handle portion 11 is preferable because it easily transmits the user's force. Further, the shape and thickness of the outer periphery of the handle portion 11 are assumed to be easily grasped by the user. For example, the handle portion 11 may have various shapes, for example, by making the cross-sectional shape of the handle portion 11 circular or rectangular, or by providing a concave portion along the shape of the finger in a part of the moving body 10. Further, the handle portion 11 in the vertical posture can be gripped at an arbitrary position in the vertical direction. That is, it is easy to use because the user can reach the handle portion 11 without depending on the height of the user.

  The moving body 10 is made of a sturdy material because it is connected to the placing shelf 16 and the screen body 4 and is loaded. The handle portion 11 is made of a molded product such as metal or synthetic resin, or a combination thereof. The material of the handle portion 11 is preferably steel or reinforced plastic. The material of the upper sliding plate 13 can be the same as that of the handle portion 11. Since the upper surface sliding plate 13 molded from the same material as the handle portion 11 can have the same expansion coefficient, it is possible to reduce the damage caused by the connecting portion. Further, the movable body 10 can be integrally molded to increase the bending strength. Alternatively, it is possible to reduce the total amount of the blackboard device as a structure in which the moving body is made of different materials and connected.

  Alternatively, the handle portion 11 may be hollow, and the wiring of the projection device PJ may be inserted into the hollow handle portion 11. As a result, the cable can be stored neatly as will be described in detail later. Alternatively, a dedicated cable storage body may be connected to the moving body, the wiring of the projection device PJ may be stored in the cable storage body, and interlocked with the moving body. The cable housing is provided in a vertical posture, that is, substantially parallel to the handle portion 11, and has an insertion hole penetrating in the vertical direction through which the wiring can be inserted. Accordingly, the wiring of the projection device PJ placed above can be inserted from the upper end to the lower end of the cable housing, and the wiring drawn out on the lower side can be connected to the video source supply device. As a result, it is possible to reduce the exposure of the auxiliary device mounted on the upper and lower sides of the main blackboard 1, that is, the projection device PJ and the video source supply device PC, thereby avoiding damage. In addition, tangling and hooking of the wiring can be prevented. In particular, entanglement of the code can be avoided by moving the video source supply device such as the personal computer PC integrally with the movable screen body 4.

  The power cord DC shown in FIG. 1 and the like is extended from the placing shelf 16 and connected to an external power source to supply power to the personal computer PC and the projector PJ. The power cord DC is preferably a telescopic type, for example, a curled cord. Extendable power cord DC is easy to adjust the length. In addition, the curl cord has the shortest overall length in the contracted state and is stretched according to the required amount, so that the overall length can be limited to the minimum necessary. Moreover, the total length of the power cord DC can be reduced by arranging the socket into which the plug is inserted close to the blackboard device 100. Alternatively, the power cord DC may be a winding type. The blackboard device 100 using the power cord DC as a winding type can draw out or wind the power cord DC according to the amount of movement of the moving body 10. The blackboard device 100 that can adjust the length of the cord can be conveniently used with fewer wires to be exposed.

The blackboard device 100 may further include another accessory device. As the accessory device, an electric device or an apparatus that does not need to supply power can be used. Examples of the electric device include an electric cleaner, a scanner, a sensor, a printer, and a computer. Non-electrical equipment includes a drawer-type storage box that stores equipment such as chalk, pens, and a blackboard eraser, and a hook that can stop materials. In addition, the blackboard device according to the first embodiment may be provided with these accessory devices in advance, and is used to include a state in which the accessory device is equipped. Since the blackboard device 100 equipped with the accessory device can fix the accessory device at a position corresponding to the characteristics of the accessory device in advance, the initial setting of the accessory device can be omitted.
(Fixed pipe 5)

  The fixed pipe 5 can be a metal hollow cylindrical pipe. The fixed pipe 5 is fixed to the back surface of the main blackboard 1 so as to be rotatable about the vertical protrusion 6 as a rotation axis. As a result, as shown in FIGS. 1 to 2, 4, and 5, the first horizontal protrusion 7 can be turned, and the position of the projection device PJ can be moved from the front of the main blackboard 1 to the side. That is, when the projection apparatus is used, the projection apparatus PJ is positioned at the use position as shown in FIGS. That is, the projection device PJ fixed to the tip of the first horizontal protrusion 7 is separated from the main blackboard 1 as much as possible by setting the first horizontal protrusion 7 to be substantially perpendicular to the main surface of the main blackboard 1. Thereby, the image projected from the projection device PJ can be displayed on the screen body 4 developed on the main blackboard 1.

  When the projection apparatus is not used, the projection apparatus PJ is positioned at the storage position as shown in FIGS. That is, the first horizontal protrusion 7 is rotated so as to be in a posture substantially parallel to the main surface of the main blackboard 1. As a result, the projection device PJ does not protrude from the main blackboard 1, and the projection device PJ does not get in the way. Further, if necessary, the screen body 4 can be wound up and stored in the moving body 10 so that a large area of the main blackboard 1 can be used for board writing or the like.

  Thus, by making the projection device PJ retractable, it is possible to project the projection device PJ only during use, and to switch to the retracted state when not in use, thereby improving the usability of the blackboard device. In particular, by retracting the projection device PJ above or behind the main blackboard 1, children and students can be prevented from being mischievous in education, and an accident in which the projection device PJ falls from the head of the teacher or children due to an earthquake or the like can be avoided. This is preferable from the viewpoint of safety.

  The fixed pipe may be provided with a lock mechanism for holding the fixed pipe so as not to rotate at the use position and the storage position. The locking mechanism, for example, pushes the vertical protrusion by the progress of the screw to impede rotation, or provides a protrusion that protrudes in a spring manner with respect to the vertical protrusion, and corresponds to the use position and the storage position. A known configuration for temporarily stopping the rotation, such as opening a projection hole for housing the projection and inserting the projection into the projection hole to inhibit the rotation, can be used as appropriate.

By making the fixed pipe 5 cylindrical in this way, in addition to being easy to rotate around the outer periphery of the vertical protrusion 6 as a rotation axis, the user can easily hold the vertical protrusion 6 and the operability is excellent. In addition, the cylindrical outer shape is superior in rigidity to torsion as compared to square bars and the like, and has an advantage that the reinforcing effect is enhanced because the connecting portions are provided with concave and convex stripes to be described later along the extending direction. can get. In addition, by making the inside a hollow pipe, it becomes possible to store the cables inside, which is advantageous in terms of the handling of the cables.
(Weight WT)

  As shown in FIGS. 3 and 6, the fixed pipe 5 is bent in an S shape when viewed from the side. In particular, the first horizontal protruding portion 7 fixed in the bent posture at the upper end of the vertical protruding portion 6 and the second horizontal protruding portion 8 fixed in the same bent posture at the lower end of the vertical protruding portion 6 are opposite to each other. It is configured to protrude. A weight WT corresponding to the weight of the projection device PJ is disposed at the tip of the second horizontal protrusion 8. With this configuration, even when a heavy projection device is used, it is possible to avoid a situation in which the blackboard device becomes unbalanced and unstable or easily tilts forward when the projection device is moved to the use position. Further, by providing the caster 3 at the lower end of the second horizontal protrusion 8, the heavy weight WT can be supported by the installation surface of the blackboard device, and the stability is increased.

The weight of the weight WT is determined according to the weight of the projection device PJ and the fixed position on the second horizontal protrusion 8. For example, when the second horizontal protrusion is longer than the first horizontal protrusion and the weight is fixed to the tip of the second horizontal protrusion, a weight that is lighter than the projection device can be used. Preferably, the lengths of the second horizontal protrusion and the first horizontal protrusion are substantially equal, and the weight of the weight is substantially equal to that of the projection device. Thereby, the weights are arranged in a balanced manner so that the user can easily turn the fixed pipe 5 and can use the blackboard device in a balanced manner regardless of the position of the projection device. A metal block or the like can be suitably used for the weight.
(Connector 9)

As described above, the fixed pipe 5 includes the vertical projecting portion 6 and the first horizontal projecting portion 7 and the second horizontal projecting portion 8 fixed in a bent posture at the upper and lower sides thereof. The vertical protrusions 6, the first horizontal protrusions 7, and the second horizontal protrusions 8 are each fixed by a connector 9. As shown in FIGS. 7 to 13, the connector 9 includes a pair of first joints 30 and a second joint 35 sandwiched between the first joints 30. Each of the first joint 30 and the second joint 35 includes an insertion end 34 to be inserted into either the vertical protrusion 6 or the first horizontal protrusion 7, and the end opposite to the insertion end 34 is The connection end 33 is connected to the second joint 35 or the first joint 30. In this example, the first joint 30 is inserted into the first horizontal protrusion 7 and the second joint 35 is inserted into the vertical protrusion 6. Of course, on the contrary, it goes without saying that a configuration in which the second joint is inserted into the first horizontal protrusion and the first joint is inserted into the vertical protrusion can be similarly employed.
(Connection end 33)

The second joint 35 is formed with a sandwiched surface 37 on the opposing surface so that the second joint 35 is sandwiched between the pair of first joints 30 at the connection end 33. On the other hand, each of the pair of first joints 30 includes a sandwiching surface 36 for sandwiching the sandwiched surface 37 at the connection end 33. Further, as shown in FIG. 8A (a), in a state where the pair of first joints 30 are joined, the pinching surface 36 of the second joint 35 is sandwiched between the coupling ends 33, so Is formed in a U-shape in a sectional view. Further, the insertion end 34 provided on the opposite side of the coupling end 33 in a state where the sandwiched surface 37 of the second joint 35 is sandwiched between the sandwiching surfaces 36 of the pair of first joints 30 is shown in FIG. As shown in FIG. 10, it is inserted into the opening edge 43 of the vertical protrusion 6 and the first horizontal protrusion 7 and fixed. In this state, a fixing member for fixing the connecting tool, the vertical protruding part, and the first horizontal protruding part, such as a pin and a screw, is added so that the connecting tool does not fall off from the vertical protruding part and the first horizontal protruding part. You can also
(Insertion end 34)

The insertion ends 34 of the first joint 30 and the second joint 35 are each formed in a rod shape, and are inserted into the hollow cylindrical opening end edges 43 opened at the end edges of the vertical projecting portion 6 and the first horizontal projecting portion 7, respectively. Is done. Here, the contact surface between the hollow cylindrical shape and the rod shape is formed in an uneven strip. By forming in this way, the rod shape inserted into the hollow cylindrical shape is prevented from rotating on the inner surface of the hollow cylindrical shape by the irregularities, and the first horizontal protrusion 7 rotates due to the weight of the projection device PJ and the like. Can be avoided. In addition, the formation of the uneven surface adds resistance to the direction of twisting of the fixed pipe, and, like the above-described fixed pipe, coupled with the fact that the outer shape is cylindrical and the rigidity against twisting is increased, A secondary effect is also obtained in that the strength is improved by the projections and depressions.
(First sub-joint 31, second sub-joint 32)

  The first joint 30 shown in FIGS. 8A to 12 is divided into two parts, and is constituted by a pair of a first sub-joint 31 and a second sub-joint 32. In this example, the first sub-joint 31 and the second sub-joint 32 are formed asymmetrically. Specifically, the insertion end 34 side of the first sub-joint 31 is formed in a size of a semicircle or more in a cross-sectional view, and the insertion end 34 side of the second sub-joint 32 is a size of a semi-circle or less in a cross-sectional view. Is formed. In a state where the first sub-joint 31 and the second sub-joint 32 are joined to form the first joint 30, the first sub-joint is formed so that the insertion end 34 of the first joint 30 is substantially circular in a sectional view. 31 and the insertion end 34 side of the 2nd subjoint 32 are each formed complementarily.

  Moreover, in this example, the connection end 33 side of the first sub-joint 31 is formed in an L-shape in which a portion where the holding surface 36 is formed is stepped. On the other hand, the second sub-joint 32 is formed so that the connecting end 33 side has a substantially flat plate-like portion where the holding surface 36 is formed. By doing so, the first sub-joint 31 and the second sub-joint 32 are joined, and the flat shape of the second sub-joint 32 is overlapped with the L-shape of the first sub-joint 31, As shown in FIG. 8A (a), a connecting end 33 having a U-shaped cross-sectional view can be formed. By forming the first sub-joint 31 larger than the second sub-joint 32 in this way, it is possible to expect an effect of increasing the rigidity by increasing the number of continuous forming portions in the connecting portion with the fixed pipe 5 and the second joint 35. In addition, the first sub-joint 31 formed to have a cross section of a semi-circle or more can easily hold a wiring cable or the like at the time of assembly, and an advantage of improving workability can be obtained. In particular, in the configuration in which the first joint is divided into two in the vertical direction, it is difficult to hold the cables when they are inserted into the first joint if they are equally divided left and right. Therefore, as described above, by making the first sub-joint 31 larger than a semicircle, it is possible to easily hold the cables in the first sub-joint 31 even before joining, and it is easy to set the cable during assembly work. Is obtained.

In addition, although not shown in figure, it is also possible to comprise a 1st subjoint and a 2nd subjoint in the same shape. In this way, according to the configuration in which the first joint is bifurcated symmetrically, the first sub-joint and the second sub-joint can be formed using the same mold or the like, and the manufacturing cost can be reduced. There is an advantage that work efficiency can be improved.
(Uneven strip)

The opening edge 43 of the vertical protrusion 6 and the first horizontal protrusion 7 is formed in a pipe shape as described above. On the inner surface of the pipe-shaped opening edge 43, as shown in FIG. 9, a first uneven strip 41 having a gear shape in section is formed in the extending direction of the connecting pipe. On the other hand, the insertion end 34 of the first joint 30 and the second joint 35 has an outer diameter that can be inserted into the inner surface of the opening edge 43, and the outer surface of the insertion end 34 is meshed with the first ridges 41. The second ridges 42 are also formed in the extending direction. Such a meshing structure of the first ridges 41 and the second ridges 42 prevents the connecting tool 9, the first horizontal protrusion 7 and the vertical protrusion 6 from rotating on the connection surface as described above. The In addition to this, in the state where the first sub-joint 31 and the second sub-joint 32 are joined, the second uneven strip 42 is formed along the circumference of the cylinder at the insertion end 34 of the first joint 30 after joining. If this insertion end 34 is inserted into the opening edge 43, the effect that the first sub-joint 31 and the second sub-joint 32 are fixed in a joined state by the meshing with the first uneven strip 41 is also obtained. In other words, it is not necessary to fix the first sub-joint and the second sub-joint in advance with screws, etc., and in addition to extremely high work efficiency, the fixing structure of these first sub-joint and second sub-joint is Since it can be omitted, the shapes of the first sub-joint and the second sub-joint can be simplified, which contributes to a reduction in manufacturing cost.
(Angle adjustment mechanism)

The connecting end 33 includes an angle adjustment mechanism that sets and fixes the first joint 30 and the second joint 35 at a desired angle. The angle adjustment mechanism will be described based on the exploded view of FIG.
(Dental surface 50)

  An engagement surface 50 is provided at the connection end 33 of the connector 9. That is, the sandwiching surface 36 of the first joint 30 and the sandwiched surface 37 of the second joint 35 are respectively formed on the meshing surface 50. Each toothed surface 50 is formed radially from the center at a constant pitch, and can be held in a state where no positional deviation occurs by engaging with the other toothed surfaces 50. In other words, the connecting portion between the first joint 30 and the second joint 35 is a tooth between the interdigitated surfaces 50 provided on the sandwiching surface 36 of the first joint 30 and the sandwiched surface 37 of the second joint 35. Rotation is prevented by the combination, and it can be fixed in a state maintained at a predetermined angle. With such a configuration, the structure for bending and fixing the fixed pipe 5 can be held very easily in a state bent at a desired angle, and the support structure can be bent while exhibiting sufficient mechanical strength. Is realized. As a result, a plurality of metal pipes are bent at a desired angle using straight metal pipes that are easy to form, without forming metal pipes that require sufficient mechanical strength in advance. Since it can be easily connected in a state and has sufficient connection strength, there is an advantage that a support structure suitable for supporting a heavy object such as a projection apparatus can be easily realized.

  More specifically, as shown in FIGS. 9, 10, etc., a semicircular first semicircular protruding portion 38 is protruded from the tip of the first joint 30. The outer surface of the semicircular protrusion is formed in a chamfered shape, and the inner surface side is a sandwiching surface 36 having a U-shape in cross section. Further, on the holding surface 36, first tooth engagement surfaces 51 are formed radially from a substantially circular center. On the other hand, a semicircular second semicircular protrusion 39 is also protruded from the tip of the second joint 35. The second semicircular protruding portion 39 has both side surfaces which are substantially parallel flat surfaces, and a second engagement surface 52 is formed radially from a substantially circular center as a sandwiched surface 37 here.

  These toothing surfaces 50 are formed so as to be able to mesh with each other. In particular, each tooth surface 50 has a constant pitch, that is, the radiation angle has a constant value, and the tooth surfaces 50 can be overlapped with each other and can be held so as not to be displaced in the overlapped state. Moreover, the rotational position at the time of superposition, that is, the angle formed by the first joint 30 and the second joint 35 can be arbitrarily set. For this reason, the user holds the pinched surface 37 of the second joint 35 with the pinched surface 36 of the first joint 30 in a state where the tooth joint surfaces 50 of the first joint 30 and the second joint 35 are overlapped at a desired angle. Then, by inserting the insertion end 34 into the opening end edge 43 of the fixed pipe 5, the fixed pipe 5 can be fixed in a contacted state at a desired angle. In this structure, the fixed pipes can be reliably fixed in a bent state, the structure is extremely simple, and the inclination angle can be easily set and changed, which is ideal as a support structure for heavy objects. In this way, the fixed pipe 5 can be constructed as shown in FIG. 6 and the like by connecting the vertical protrusion 6, the first horizontal protrusion 7, and the second horizontal protrusion 8 in a bent posture.

  In the examples of FIGS. 9 and 10, the meshing surface 50 is formed in a cross-sectional uneven strip. In particular, it is preferable that the cross-sectional shape is provided with a vertical surface because resistance in the rotation direction can be exhibited. However, the shape is not limited to the concave and convex stripes, and may be a saw blade shape, a triangular shape, other polygonal shapes, a chamfered rectangular shape, or the like. Alternatively, a plurality of bosses, cylindrical protrusions, and the like may be provided uniformly to form a complementary male mold and female mold for matching. In any case, it is preferable to provide a vertical wall surface in order to resist the rotation direction of the toothed surfaces. On the other hand, for example, in applications that prohibit rotation in one direction but allow rotation in the opposite direction, allow the rotation in one direction, such as making the shape of the toothed surface a vertical triangle in cross section. It is also possible to employ a detent or a detent structure that prohibits rotation to the other side.

In this way, the sandwiching surface 36 and the sandwiched surface 37 are engaged with each other, and the insertion surface of the connecting tool and the fixed pipe opening edge 43 is an uneven surface, and any rotation in a substantially orthogonal plane is performed. By adopting a configuration that also prevents this, sufficient resistance to rotation and torsion is exhibited in the connection structure between the fixed pipes, and stable connection with increased mechanical strength is maintained. In particular, when it is necessary to bend a metal pipe in terms of structure, it is necessary to take care to bend the metal pipe so that sufficient strength can be exhibited after bending. On the other hand, in this embodiment, by using a straight metal pipe and using a dedicated connector for the bent part, the structure can be simplified and the reliability in terms of strength can be increased. . In addition, by effectively combining the ridges and toothed surfaces, the assembly work can be simplified, but the connection strength can be sufficiently exerted, so it can be applied to structures that can be constructed by connecting metal pipes. The range is wide and beneficial.
(Cord insertion slot 45)

  Furthermore, the connection structure of the connection pipes using such a connection tool also has a secondary effect that it can be used for wiring using a hollow fixed pipe. In other words, harnesses and cables such as power supply lines and signal lines are indispensable particularly for electric appliances such as projectors for blackboard devices. In recent years, wireless signal transmission is also being used, but priority connection is advantageous from the viewpoint of security, communication speed, reliability, cost, and the like. However, in the case of priority connection, the handling of cables becomes a problem. Particularly in the structure having a movable part such as the projection apparatus PJ that is pivotable as in this embodiment, the cables also move together as it moves. For this reason, if the cables are left exposed, the cables may be entangled with each other, or may come into contact with or rub against other members, which may cause damage or disconnection. In addition, it is not preferable for users to be bothered by cables. Especially in a blackboard device used in educational institutions, children and students may catch their feet and hands on the cables. It can be said that it is preferable not to be exposed to the outside as much as possible.

In this embodiment, while using a hollow fixed pipe, the connecting tool also has a cord insertion port 45 communicating with the internal space of the fixed pipe, so that the cables can be connected from one fixed pipe to the connecting tool. The advantage is that it can be guided to other fixed pipes. For example, in the example of FIGS. 9 and 10, the insertion end 34 of the first joint 30 and the second joint 35 is hollow, and the first semicircular protrusion 38 of the first joint 30 has a U-shaped cross-sectional view. By opening the U-shaped bottom surface at the connection end 33 and opening the cord insertion port 45 on the side facing the first joint 30 at the second semicircular protrusion 39 of the second joint 35. Cables can be guided from the vertical protrusion 6 to the first horizontal protrusion 7 through these openings. As a result, the cables can be stored inside the fixed pipe, and the user can make the blackboard device extremely easy to handle without worrying about the handling of the cables by not exposing the cables to the outside. In addition, by wiring the power supply line and signal line of the projection apparatus PJ in advance via a fixed pipe, the user is freed from the troublesome work of wiring.
(Modification)

  Moreover, it is not always necessary for the coupler to include an angle adjusting mechanism. When the bending angle is determined, it is possible to use a coupler molded in a bent state in advance. The perspective view of FIG. 14 and the plan view of FIG. 15 show a connector 9B according to such a modification, omitting the angle adjustment mechanism. This connector 9B is also a cylindrical metal pipe having a hollow inside, and is formed in a state where the whole is bent in advance at a predetermined angle. In this example, it is a folding joint bent at about 90 °. Moreover, the edge of both sides is made into the insertion end 34B, and the outer diameter is made small once to insert in the opening edge 43 of a fixed pipe. Similarly to the above, the insertion end 34B also has a second concavo-convex ridge 42 that meshes with the first concavo-convex ridge 41 formed in the extending direction on the outer surface of the insertion end 34B. Since the connecting tool 9B omits the angle adjusting mechanism, the structure is extremely simple and the advantage that the manufacturing cost can be reduced is obtained. Further, since the structure is simple, the mechanical strength is higher than that of the example of FIG. 7 and the like, and the reliability is also excellent. In particular, it is easy to connect the fixed pipes in a bent state, and in addition, by engaging the second uneven strip 42 of the insertion end 34B with the first uneven strip 41 of the fixed pipe, It is possible to obtain a strong connection structure that prevents rotation and increases rigidity in the twisting direction. In particular, cylindrical pipes are more rigid in the direction of rotation than square bars, etc. In addition, the effect of further increasing the strength of metal pipes can be expected due to the fact that the side surfaces are provided with irregularities along the extension direction. .

As described above, by configuring with a connector having only the bent portion as a separate member, the bulk of the member can be reduced compared to a configuration in which the fixed pipe itself is bent, which is advantageous in terms of transportation and storage. The fixed pipe is preferably made of aluminum. Thereby, the 1st uneven | corrugated strip 41 can be easily formed by an extrusion process. The fixed pipes are all cylindrical in the above example, but if sufficient rigidity against torsion can be secured, prismatic pipes or polygonal cross sections can be used. It is. In this sense, in this specification, the pipe is not limited to a columnar shape or a cylindrical shape.
(Example 2)

  In the above example, the self-supporting blackboard device that can be moved by the caster 3 has been described. However, the present invention is not limited to such an example, and can also be applied to a blackboard fixed to a wall surface. Such an example is shown in FIGS. 16 to 18 as a second embodiment. In these drawings, FIG. 16 is an external perspective view of the blackboard device 200, FIG. 17 is a perspective view showing a state in which the projection device PJ is stored in FIG. 16, and FIG. 18 is a schematic sectional view of FIG. The blackboard device 200 shown in these drawings includes a main blackboard 1 fixed to a wall surface WL, a moving body 10 connected in a slidable manner along the main surface of the main blackboard 1, and winding from the moving body 10. A screen body 4 that can be expanded in a formula, a projection device PJ for projecting an image on the screen body 4, and a fixing pipe 5B for fixing the projection device PJ above the main blackboard 1 are provided. In the example shown in this figure, the fixed pipe 5B includes a vertical protrusion 6B protruding from the upper surface of the main blackboard 1, and a first horizontal protrusion 7 fixed so as to extend horizontally from the upper end of the vertical protrusion 6B. ing.

  In a wall-mounted blackboard, it is not always necessary to provide a fixed pipe turning structure, and a fixed-type blackboard may be used. However, it is also possible to add a turning function to such a fixed blackboard device. In this case, since the projection device that is swung and positioned in the lateral direction may come into contact with the wall surface, it is desirable to add a structure that prevents the projection device from contacting the wall surface. For example, the rotation angle of the projection device is limited so that the projection device cannot be rotated until it contacts the wall surface, or a cushioning material such as a cushion is provided at the contact position between the projection device and the wall surface. For example, the corner of the projection device is covered with a cushion, or an impact absorbing sheet is stuck on the wall surface. Alternatively, as shown in FIGS. 16, 17, and 18, a recess OS is partially provided on the wall surface WL so that the projection apparatus PJ can be stored while being swung to the side surface, and the storage space for the projection apparatus PJ is provided. May be formed. With this configuration, the projection device PJ can be stored in the wall surface WL when not in use, and the opening portion of the recess OS can be covered with a cover or a lid as necessary. It is preferable. However, even if the projection apparatus is not completely housed as shown in FIGS. 17 and 18 or the like, even if it is retracted to the vicinity of the wall surface, the use of the main blackboard is prevented as a minimum when it is not in use. Can function well.

In this case, by omitting a weight or the like protruding from the lower surface of the blackboard, it is possible to eliminate the need to provide a recess on the wall surface below the blackboard. In other words, in the wall-mounted blackboard device, there is no risk of falling as in the case of a self-supporting blackboard device. Therefore, a weight for balancing with the projection device is basically unnecessary, and thus the weight is fixed. There is no need to provide a member such as a second horizontal protrusion for the purpose.
(Example 3)

  Furthermore, not only the blackboard apparatus provided with such a turning mechanism, but also a blackboard apparatus that does not have a turning function, the present invention can be suitably used in order to easily construct a support structure for the projection apparatus. Such an example will be described as a third embodiment with reference to FIG. The blackboard device 300 shown in this figure includes a main blackboard 1 fixed to a plane, a moving body 10 connected in a slidable manner along the main surface of the main blackboard 1, and a winding type from the moving body 10. An unfoldable screen body 4, a projection device PJ for projecting an image on the screen body 4, and a fixing pipe 5 </ b> C for fixing the projection device PJ above the main blackboard 1 are provided. In the example shown in this figure, as the fixed pipe 5C, in addition to the vertical protrusion 6C protruding from the upper surface of the main blackboard 1 and the first horizontal protrusion 7C fixed to extend horizontally from the upper end of the vertical protrusion 6C. The lower end of the vertical protrusion 6C extends to the upper side of the main blackboard 1 and has a short length that does not reach the main blackboard 1. On the other hand, a third horizontal portion 7D that extends horizontally along the upper end of the main blackboard 1, and its It is composed of a fourth horizontal portion 7E that is bent so as to protrude forward of the main blackboard 1 at the edge, and a second vertical portion 7F that extends vertically along the surface of the main blackboard 1 at the edge. The The vertical protrusion 6C, the first horizontal protrusion 7C, the third horizontal part 7D, the fourth horizontal part 7E, and the second vertical part 7F are fixed to the respective connection interfaces using the above-described connectors. Further, the fixed pipe 5 </ b> C is fixed to the moving body 10 provided with the winding screen body 4. Further, the lower end of the second vertical portion 7F is fixed to the placing shelf portion 16. As described above, the storage shelf 16 can be mounted with a personal computer PC that supplies video information to the projection device PJ.

  Since the second vertical portion 7F is disposed on the front surface of the main blackboard 1, the user grasps the second vertical portion 7F by hand, and the moving body 10 fixed to the fixed pipe 5C, that is, the screen provided on the moving body 10 is secured. The body 4, the projection device PJ, the personal computer PC, etc. can be moved together. That is, the second vertical portion 7F functions as the handle portion 11. The moving body 10 placed at a desired position by the handle 11 does not change the relative distance from the projection device PJ, and thus can correctly display an image at any position. In addition, preferably, the projection device PJ is arranged so as to be located at the approximate center of the screen body 4 in a state where the screen body 4 is unfolded, so that the projection image can be displayed using the entire screen.

  In addition, cables such as a signal line for sending a video signal from the personal computer PC to the projector PJ and a power cable for supplying driving power to the projector are arranged inside the fixed pipe 5C so that the cables are not exposed. It becomes possible to put together.

  In this example, the bent portions are all about 90 °. By doing in this way, the setting of a bending angle becomes easy, and the angle adjustment function shown in FIG. 14 etc. other than the connection tool 9 which concerns on Example 1 shown in FIG. It is also possible to use a connector 9B.

  The blackboard device of the present invention and the connector used therefor can be suitably applied to a self-supporting whiteboard equipped with casters, a school blackboard, an overhead projector, and the like.

DESCRIPTION OF SYMBOLS 100, 200, 300 ... Blackboard apparatus 1 ... Main blackboard 2 ... Frame body 3 ... Caster 4 ... Screen body 5, 5B, 5C ... Fixed pipe 6, 6B, 6C ... Vertical protrusion part 7, 7C ... First horizontal protrusion part 7D ... 3rd horizontal part 7E ... 4th horizontal part 7F ... 2nd vertical part 8 ... 2nd horizontal protrusion 9, 9B ... Connecting tool 10 ... Moving body 11 ... Handle part 13 ... Upper surface sliding plate 16 ... Placement rack part 30 ... 1st joint 31 ... 1st subjoint 32 ... 2nd subjoint 33 ... Connection end 34, 34B ... Insertion end 35 ... 2nd joint 36 ... Nipping surface 37 ... Nipped surface 38 ... 1st semicircle protrusion Portion 39 ... Second semicircular protrusion 41 ... First uneven strip 42 ... Second uneven strip 43 ... Opening edge 45 ... Cord insertion port 50 ... Intergrated surface 51 ... First toothed surface 52 ... Second toothed Surface 90, 90B, 90C, 90D ... Blackboard device 91 ... Blackboard 91B ... Whiteboard De 92 ... mirror 93 ... caster 94 ... screen 95 ... arm DC ... power cord PC ... video source supply device (a personal computer)
PJ ... Projector
WT ... Wait WL ... Wall OS ... Recess

Claims (23)

Main blackboard (1),
A projection device (PJ) for projecting an image on the main surface of the main blackboard (1);
A fixing pipe (5) for fixing the projection device (PJ) above the main blackboard (1);
A blackboard device comprising:
The fixed pipe (5)
A vertical protrusion (6) protruding upward from the upper part of the main blackboard (1);
A first horizontal protrusion (7) that is bent in a horizontal posture from the vertical protrusion (6) and fixes the projection device (PJ) at the tip;
Consists of
The blackboard device further includes a connector (9) for connecting the vertical protrusion (6) and the first horizontal protrusion (7),
With
The connector (9) is
A pair of first joints (30) having an insertion end (34) inserted into either the vertical protrusion (6) or the first horizontal protrusion (7);
A second joint (35) having an insertion end (34) inserted into either one of the first horizontal protrusion (7) or the vertical protrusion (6);
Consists of
The first joint (30) and the second joint (35) are respectively connected to the first joint (30) and the second joint (35) at the end opposite to the insertion end (34). It has a connecting end (33),
The second joint (35) includes a sandwiched surface (37) on an opposing surface so as to be sandwiched between the pair of first joints (30) at the connection end (33),
Each of the pair of first joints (30) includes a sandwiching surface (36) for sandwiching the sandwiched surface (37) at the connection end (33), and the pair of first joints (30). In the state where the first joint (30) is joined, in order to sandwich the sandwiched surface (37) of the second joint (35) at the connecting end (33), the sandwiching surface (36) , Formed in a U-shaped cross-sectional view,
The sandwiching surface (36) of the first joint (30) and the sandwiched surface (37) of the second joint (35) are radially formed from the center at a constant pitch and can be engaged with each other. Formed on the toothed surface (50),
The pair of first joints in a state where the sandwiching surface (36) of the first joint (30) and the sandwiched surface (37) of the second joint (35) are engaged at a desired angle. (30) nipping the second joint (35) between the first joint (30) and the second joint (35), respectively, the vertical protrusion (6) or the first horizontal protrusion (7) A blackboard device, wherein the second joint (35) is fixed in a state of maintaining the predetermined angle with respect to the first joint (30). A blackboard device according to claim 1,
A blackboard device, wherein the toothing surface (50) is formed in a cross-sectional uneven shape or a saw-tooth shape. A blackboard device according to claim 1 or 2,
The opening edge (43) connected to the connection end (33) of the connector (9) of the vertical protrusion (6) and / or the first horizontal protrusion (7) has a hollow cylindrical shape, and the connection A blackboard device characterized in that the connecting end (33) of the tool (9) has a rod shape that can be inserted into the hollow cylindrical shape, and a contact surface between the hollow cylindrical shape and the rod shape is formed in an uneven strip. . A blackboard device according to claim 3,
The vertical protrusion (6) and the first horizontal protrusion (7) are formed in a pipe shape having an open end, and the inner surface of the pipe-shaped open end edge (43) is a cross-sectional view. A gear-shaped first irregularity strip (41) is formed,
The outer surface of the insertion end (34) of the first joint (30) and the second joint (35) is formed with a second uneven strip (42) that meshes with the first uneven strip (41). Blackboard device characterized by. A blackboard device according to any one of claims 1 to 4,
The vertical protrusion (6) is disposed on the back side of the main blackboard (1), and extends so as to protrude not only above the main blackboard (1) but also from below.
Furthermore, at the lower end of the vertical protrusion (6), it comprises a second horizontal protrusion (8) that protrudes on the opposite side to the protrusion direction of the first horizontal protrusion (7),
A weight (WT) that can be balanced with the weight of the projection device (PJ) fixed to the tip of the first horizontal protrusion (7) is fixed to the tip of the second horizontal protrusion (8). A blackboard device characterized by comprising A blackboard device according to claim 5,
A blackboard device, wherein the vertical protrusion (6) is pivotally fixed on the back of the main blackboard (1). A blackboard device according to any one of claims 1 to 6,
A blackboard device, wherein the fixed pipe (5) is formed in a cylindrical shape. A blackboard device according to any one of claims 1 to 7,
The fixed pipe (5) is configured in a hollow shape,
Furthermore, the first joint (30) and the second joint (35) each form a space inside,
In a state where the vertical protrusion (6) and the first horizontal protrusion (7) are connected via the connector (9) configured by the first joint (30) and the second joint (35). The blackboard device, wherein the hollow shape of the fixed pipe (5) and the internal space of the first joint (30) and the second joint (35) communicate with each other. A blackboard device according to claim 8,
The first joint (30) and the second joint (35) are formed in a semicircular shape at one edge provided with a sandwiching surface (36) and a sandwiched surface (37) for connection to each other. The first joint (30) and the second joint (35) are provided with semicircular protrusions protruding from the tips of the first and second joints (35). Surface (50) is formed,
In the pinched surface (36) and the pinched surface (37) of the first joint (30) and the second joint (35), the first joint (30 ) And the sandwiched surface (36) and the sandwiched surface (37) of the second joint (35) are inserted into the pipe-shaped end edges of the vertical projecting portion (6) and the first horizontal projecting portion (7), respectively. A blackboard device characterized by being fixed while maintaining a connected state. A blackboard device according to claim 9,
The blackboard device, wherein the pair of first joints (30) are formed in different shapes. A blackboard device according to claim 10,
One of the pair of first joints (30) is a first sub-joint (31), the other is a second sub-joint (32),
The insertion end (34) side of the first sub-joint (31) is formed in a size of a semicircle or more in a sectional view,
The insertion end (34) side of the second sub-joint (32) is formed in a size of a semicircle or less in a sectional view,
In the state where the first sub-joint (31) and the second sub-joint (32) are joined to form the first joint (30), the insertion end (34) of the first joint (30) is viewed in cross-section. The insertion end (34) side of the first sub-joint (31) and the second sub-joint (32) are respectively formed in a complementary manner so as to be substantially circular in
Further, the connection end (33) side of the first sub-joint (31) is formed in a substantially L shape,
On the other hand, the connection end (33) side of the second sub-joint (32) is formed in a substantially flat plate shape,
In a state where the first sub-joint (31) and the second sub-joint (32) are joined, the substantially flat plate shape of the second sub-joint (32) in a substantially L shape of the first sub-joint (31). A blackboard device characterized by being formed so as to form a connecting end (33) having a U-shaped cross-sectional view by overlapping the two. The blackboard device according to any one of claims 1 to 11, further comprising:
A screen body (4) that can be arranged on the main surface of the main blackboard (1),
The projection device (PJ)
A blackboard device configured to project an image on the screen body (4) disposed on a main surface of the main blackboard (1). A blackboard device according to claim 12,
A blackboard device, wherein the screen body (4) is of a winding type and can be deployed on the main blackboard (1), and can be wound up and stored when not in use. The blackboard device according to claim 13, further comprising:
A movable body (10) connected in a slidable state along the main surface of the main blackboard (1),
The screen body (4) is provided on the moving body (10), and the screen body (4) is configured to be unfoldable at a desired position on the main surface of the main blackboard (1). Blackboard device characterized by. A blackboard device according to any one of claims 1 to 14,
A blackboard device, wherein the main blackboard (1) is fixed to a wall surface. The blackboard device according to any one of claims 1 to 15, further comprising:
A frame body (2) for holding the main blackboard (1) in an independent state;
A movable caster (3) fixed to the lower surface of the frame body (2);
A blackboard device comprising: A blackboard device according to claim 16,
The vertical protrusion (6) is disposed on the back side of the main blackboard (1), and extends so as to protrude not only above the main blackboard (1) but also from below.
Furthermore, at the lower end of the vertical protrusion (6), it comprises a second horizontal protrusion (8) that protrudes on the opposite side to the protrusion direction of the first horizontal protrusion (7),
A blackboard device comprising a caster (3) fixed to the second horizontal protrusion (8). A blackboard device according to any one of claims 1 to 17,
A blackboard device, wherein the main blackboard (1) is a whiteboard. A connecting tool for connecting the first fixed pipe and the second fixed pipe,
A pair of first joints (30) having an insertion end (34) inserted into either the first fixed pipe or the second fixed pipe;
A second joint (35) having an insertion end (34) inserted into either the second fixed pipe or the first fixed pipe;
With
The first joint (30) and the second joint (35) are respectively connected to the first joint (30) and the second joint (35) at the end opposite to the insertion end (34). It has a connecting end (33),
The second joint (35) includes a sandwiched surface (37) on an opposing surface so as to be sandwiched between the pair of first joints (30) at the connection end (33),
Each of the pair of first joints (30) includes a sandwiching surface (36) for sandwiching the sandwiched surface (37) at the connection end (33), and the pair of first joints (30). In the state where the first joint (30) is joined, in order to sandwich the sandwiched surface (37) of the second joint (35) at the connecting end (33), the sandwiching surface (36) , Formed in a U-shaped cross-sectional view,
The sandwiching surface (36) of the first joint (30) and the sandwiched surface (37) of the second joint (35) are radially formed from the center at a constant pitch and can be engaged with each other. Formed on the toothed surface (50),
The pair of first joints in a state where the sandwiching surface (36) of the first joint (30) and the sandwiched surface (37) of the second joint (35) are engaged at a desired angle. (30) sandwich the second joint (35) between each other, the first joint (30) and the second joint (35) are respectively inserted into either the first fixed pipe or the second fixed pipe And the second joint (35) is configured to be fixable with the predetermined angle maintained with respect to the first joint (30). The connector according to claim 19, wherein
The connection end (33) of the connection tool is inserted into the hollow cylindrical opening edge (43) of the first fixed pipe and / or the second fixed pipe connected to the connection end (33) of the connection tool. A connecting tool characterized in that it has a bar shape, and the contact surface between the hollow cylindrical shape and the bar shape is formed in an uneven strip. The connector according to claim 20, wherein
The first fixed pipe and the second fixed pipe are formed in the shape of a pipe having an open end, and the inner surface of the pipe-shaped open end edge (43) is a first concavo-convex in the shape of a gear in cross section. Article (41) is formed,
The outer surface of the insertion end (34) of the first joint (30) and the second joint (35) is formed with a second uneven strip (42) that meshes with the first uneven strip (41). A connector characterized by. In order to connect the fixed pipes (5), in which the end edge is a hollow cylindrical opening edge (43), and the inner surface thereof is formed with a first concavo-convex gear (41) in the direction of extension in the extending direction. Connecting tool (9B),
It is made of a cylindrical metal with a hollow inside, and the whole is bent at a predetermined angle,
At both ends, it is provided with insertion ends (34) for insertion into the fixed pipe (5),
The insertion end (34) has an outer diameter that can be inserted into the inner surface of the opening edge (43), and the outer surface of the insertion end (34) meshes with the first ridges (41). A coupling tool (9B), wherein the second uneven strip (42) is formed in the extending direction. A connector (9B) according to claim 22,
The connector (9B), wherein the bending angle is approximately 90 °.

Images