JPH0794199B2 - Blackboard equipment - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a blackboard device in which a blackboard can be turned upside down so that both sides of the blackboard can be used.

[Prior Art] As this type of blackboard device, there is known a blackboard device in which a blackboard is reversibly disposed inside a frame body in which left and right side frame members are joined by an upper frame member and a lower frame member. However, the conventional one is
The central portions of both ends of the blackboard are pivotally attached to the vertical central portions of the side frame members of the frame body. In this blackboard device, the upper end of the frame body is hinged to the wall surface, and the frame body and the blackboard are normally used while being attached to the wall surface. When it is desired to use the back surface of the blackboard, the blackboard is sufficiently separated from the wall surface by rotating the frame body forward, and then the blackboard is inverted.

[Problems to be Solved by the Invention] However, in such a configuration, since the upper edge of the blackboard and the upper end of the frame material are close to each other, the frame body is located at a position substantially vertical from the vertical use position. If it is not turned up to, the blackboard cannot be turned over without interfering with the wall surface.
Therefore, it is necessary for the operator to bear about half of the total weight of the blackboard and the frame, and a large one requires a great deal of labor. Further, in such a device, if one side of the frame is gripped and operated, the frame is apt to be twisted and deformed by its own weight, and it may be difficult to smoothly rotate the blackboard.

In addition, when turning the blackboard upside down, such a device causes the turning locus of the blackboard to protrude above the hinged position of the frame body, so if it is installed in a room with a low ceiling, the ceiling will be an obstacle. It is possible that the blackboard cannot be flipped.

In order to solve such a problem, a frame has been developed in which the lower end portion of the frame is hinged to the wall surface. However, in such a structure, it is essential to lock the frame at the use position. Therefore, it is difficult to simplify the structure, and if the lock is accidentally released, the blackboard may fall forward.

The present invention aims to eliminate all such problems.

[Means for Solving the Problems] In order to achieve the above-mentioned object, the present invention has a common sense structure that has been taken for granted in the past, that is, the central portions of both ends of the blackboard are arranged in the vertical direction of the frame. It is an abolition of the structure of pivoting in the center.

That is, the blackboard device according to the present invention is one in which the blackboard is reversibly arranged inside the frame, the frame is arranged along the wall surface, and the upper end portion thereof is on the wall surface side. The blackboard is made to have a butterfly, and the blackboard has surfaces for use on the front and back sides, and the central portions of the left and right ends of the blackboard are pivotally attached to the side frame members of the frame body. The pivotal position with respect to the frame is set below the vertical center of the frame so that the blackboard can be inverted at a position lower than the hinge height of the frame. . That is, in the present invention, the trajectory drawn by the turning end of the blackboard at the time of reversing is set so as not to protrude above the hinge height of the frame.

To prevent twisting deformation of the frame particularly effectively,
The upper ends of the left and right side frame members are connected to each other by the upper frame member, and the lower ends are connected to each other by the lower frame member, and the space formed between the upper frame member and the upper edge of the blackboard is reinforced. It is recommended that the face material be rigidly installed.

In order to make the area of the blackboard as large as possible, with respect to the frame of the blackboard, the blackboard can be turned over without interfering with the fixed surface while the frame is rotated forward by 45 °. It is good to set the pivot position.

When it is desired to further reduce the operating force, a spring mechanism that stores an elastic repulsive force in the extending direction between the lower end of the side frame member of the frame and the fixing member located above this lower end. Should be installed.

The blackboard referred to in this specification includes not only a narrowly defined chalk blackboard but also so-called whiteboards and bulletin boards. That is, examples of the use surface of this blackboard include painted finish, enamel finish, and bulletin board specifications. Both the front and back sides do not have to have the same specifications.

[Operation] With such a structure, a height difference between the upper edge of the blackboard and the upper end of the frame is larger than that of the conventional one.
Therefore, even if the frame is not rotated to a position close to horizontal, the blackboard can be turned upside down without colliding with the fixed surface by rotating it to the middle thereof.

When rotating the frame from the vertical suspension posture to the front,
In the first half area of rotation, the frame has a suspended form,
The gravity acting on the frame and the blackboard has a strong tendency to be supported by the wall surface via the hinge, so that the biasing force for rotating the frame can be relatively small. Therefore, it is possible to change the front and back of the blackboard with less effort than that of the conventional one in which the blackboard cannot be inverted unless the frame is rotated to be approximately horizontal.

Further, if the turning biasing force may be small in this way, the twisting force acting on the frame body when biasing and rotating one side of the frame body becomes small. Therefore, if the frame body has the same rigidity, the degree of twist of the frame body becomes smaller than that of the conventional one, and the blackboard can be smoothly inverted.

Moreover, since the blackboard rotates at a position lower than the hinged position of the frame, even if the blackboard is installed in a room with a low ceiling, the blackboard does not interfere with the ceiling and cannot rotate.

Further, since the upper end of the frame is hinged to the wall surface, there is no risk of the frame falling forward even if no special lock is applied at the use position.

[Embodiment] An embodiment of the present invention will be described below with reference to the drawings.

As shown in FIGS. 1 and 2, this blackboard device has a blackboard 2 which is reversibly arranged inside a frame body 1.

The frame body 1 is arranged along the wall surface 3, and the upper end portion 1a of the frame body 1 is hinged to the wall surface 3 via the hinge 11.
Left and right side frame members 12 having a U-shaped cross-section with an open side, and a rectangular pipe-shaped upper frame member 13 connecting the upper ends of the frame members 12 on both sides.
And a circular pipe-shaped lower frame member 14 connecting the lower ends of the both side frame members 12 to each other. Upper frame material 13 and upper edge of blackboard 2
A reinforcing surface material 15 is rigidly installed in the space S formed between the reinforcing surface material 15 and 2a. The reinforcing surface member 15 is made of sheet metal whose peripheral edge is bent in the direction of the wall surface 3. The upper edge 15a of the reinforcing surface member 15 is attached to the upper frame member 13, and the left and right side edges 15b are attached to the side frame member 12, respectively. It is firmly attached due to etc.

The blackboard 2 has usage surfaces 21 and 22 on both front and back sides, and a frame 23 on the periphery thereof. The vertical center portions 2b at the left and right ends of the blackboard 2 are attached to the side frame members 12 of the frame body 1 by a shaft 24
It is pivotally connected through. The pivotal position P of the blackboard 2 with respect to the frame 1 is set below the vertical center N of the frame 1. Specifically, the frame 1 is
Even if the blackboard 2 is moved in a state of being rotated about 40 ° forward (see the frame 1 shown by the dashed line in FIG. 2), the blackboard 2
It is set at a position such that a safe distance L can be secured between the wall surface 3 and the wall surface 3 to avoid a collision. Even if the frame 1 is rotated up to this angle, the rotation trajectory Q of the blackboard is
It will be located lower than the hinge attachment position R of.

In addition, inside the frame body 1, the upper edge 2a and the lower edge 2c of the blackboard 2 are
There is provided a stopper 4 which elastically slidably contacts with and holds the blackboard 2 in a use position. That is, these stoppers 4
Is a circular pipe-shaped auxiliary horizontal bar 16 installed between the side frame members 12,
It is made of an elastic material that is fitted around the outer circumference of 17. Further, the spring mechanism 5 that stores the elastic repulsive force in the extension direction is interposed between the lower end 12a of the side frame member 12 of the frame 1 and the fixing member 31 located above the lower end 12a. I have set up. The spring mechanism 5 includes a cylinder 51 whose lower end is pivotally attached to the lower frame member 14, a rod 52 which is housed in the cylinder 51 so as to be capable of projecting and retracting, and whose tip is pivotally attached to the fixing member 31, and the inside of the cylinder 51. And a spring (not shown) for urging the rod 52 in the protruding direction. As shown in FIG. 3, the spring mechanisms 5 are arranged inside the left and right side frame members 12, respectively. It should be noted that the spring mechanism 5 is attached such that the pivoting position a of the spring mechanism 5 with respect to the frame member 1 is slightly smaller than the pivoting position b of the fixing member 31 at the use position where the frame body 1 is attached to the wall surface 3. It is preferable to set the size M so that it is located closer to the wall surface 3. This is because the frame pair 1 can be held in the use position by utilizing the extension force of the spring function 5. In this embodiment, when the spring mechanism 5 is in the most extended state,
The frame 1 is set so as to project forward by 45 ° with respect to the wall surface 3 (see the frame 1 shown by the broken line in FIG. 2).

With such a structure, a height difference between the upper edge 2a of the blackboard 2 and the upper end 1a of the frame 1 is larger than that of the conventional one. Therefore, even if the frame body 1 is not rotated to a position close to the horizontal, the blackboard 2 can be turned upside down without colliding with the wall surface 3 by rotating it about 40 ° forward.

When the frame 1 is rotated forward from the vertical suspension posture, the frame 1 is suspended in the first half region of rotation, that is, in the region up to about 45 °. Since the gravity acting on the frame 1 and the blackboard 2 has a strong tendency to be supported by the wall surface 3 via the hinge 11, the rotational biasing force is relatively small. Therefore, it is possible to change the front and back of the blackboard 2 with much less labor than the conventional one in which the blackboard cannot be inverted unless the frame is rotated substantially horizontally. Particularly, in this embodiment, since the spring mechanism 5 assists the forward rotation of the frame body 1, the operation can be performed with a minimum effort. If the spring mechanism 5 is provided in the positional relationship shown in FIG. 3, the spring mechanism 5 biases the frame body 1 in a direction in which the frame body 1 can be stably held in the use position in the vertical use position. Therefore, no special locking mechanism is required to prevent wobbling.

Further, as described above, if the urging force when rotating the frame 1 may be small, the twisting force that acts on the frame 1 when urging and rotating one side of the frame 1 is small. Become. Therefore, if the frame body has the same rigidity, the degree of twist of the frame body 1 becomes smaller than that of the conventional frame body, and the blackboard 2 can be turned over more smoothly. Even when the spring mechanism 5 assists the turning operation of the frame body 1 as in the present embodiment, the required biasing force may be small, so that the spring mechanism 5 is provided only on one side of the frame body 1. Will be enough.

Moreover, since the blackboard 2 rotates at a position lower than the hinged position R of the frame 1, no matter how low the ceiling (not shown) is installed in the room, the blackboard 2 interferes with the ceiling and rotates. The problem of being unable to move does not occur.

It should be noted that the user of the blackboard may have both painted finish, both enamel finish, and both may have bulletin board specifications.
The front side use surface and the back side use surface may have different specifications.

The present invention also includes a blackboard device that does not have a spring mechanism.

EFFECTS OF THE INVENTION Since the present invention has the above-described configuration, the blackboard can be inverted without rotating the frame body close to horizontal. Therefore, it is possible to change the front and back of the blackboard with less effort than the conventional one. Further, according to the present invention, since the urging force required to rotate the frame is small, even if the frame is urged to rotate on one side, the frame does not twist. It can be effectively suppressed. Therefore, the blackboard can be turned over smoothly. Further, according to the present invention, since a space is formed between the upper edge of the blackboard and the upper end of the frame body, it is easy to take reinforcement measures to increase the rigidity of the frame body by utilizing the space. Therefore, the twisting deformation of the frame body can be effectively prevented in combination with the decrease in the rotational biasing force.

For example, if a reinforcing surface material is rigidly provided in the space formed between the upper frame member and the upper edge of the blackboard as in the above-described embodiment, the rigidity of the frame body is dramatically increased by the minimum weight increase. It is possible to improve.

Moreover, according to the present invention, since the turning locus of the blackboard at the time of reversing does not protrude above the hinged position with respect to the wall surface of the frame body, the blackboard can be reliably placed even in a room with a low ceiling. Can be inverted. Then, when the ceiling is low, it is possible to hinge the upper end of the frame to the uppermost part of the wall surface. In that case, the vertical dimension of the blackboard can be maximized by setting the blackboard so that it can be inverted at the position where the frame is rotated 45 ° forward.

In addition, the upper edge of the blackboard is usually set at a height position that the user can reach by reaching, so if the frame needs to be rotated near horizontal as in the conventional case. However, according to the present invention, it is possible to invert the blackboard at an optimum height position that does not require stretching.

In addition, the frame body has its upper end hinged to the wall surface, and since the frame body and the blackboard are hung at the use position, it seems that the lower end of the frame body is hinged. There is no danger of falling forward.

Furthermore, if a spring mechanism that stores an elastic repulsive force in the extension direction is provided between the lower end of the side frame member of the frame body and the fixing member located above the lower end, It is possible to further reduce the operation force applied from the outside, and it is possible to easily deal with an apparatus having a large blackboard.

[Brief description of drawings]

1 is a front view, FIG. 2 is a side view, and FIG. 3 is a side sectional view showing an enlarged portion of a spring mechanism. 1 …… Frame, 1a …… Top part 2 …… Blackboard, 2b …… Center part 3 …… Wall surface 4 …… Lower frame material 5 …… Spring mechanism 21, 22 …… Use surface 12 …… Side frame material , 12a ...... Lower end part 13 ...... Upper frame material, 15 ...... Reinforcing surface material 31 ...... Fixing member, N ...... Vertical center P ...... Pivot position, Q ...... Rotation locus R ...... Pivot position , S ... space

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-2-31708 (JP, A) Actually developed 52-44837 (JP, U)

Claims (7)

[Claims] 1. A blackboard device in which a blackboard is provided inside a frame so as to be reversible, wherein the frame is arranged along a wall surface, and an upper end portion thereof is hinged to the wall surface side. The blackboard has a use surface on both front and back sides, and is pivotally attached to the side frame of the frame at the center of both left and right ends of the blackboard. A blackboard device characterized in that a position is set to be lower than a vertical center of the frame body and the blackboard can be inverted at a position lower than a hinge height of the frame body. 2. A frame body in which upper ends of left and right side frame members are joined together by an upper frame member and lower ends thereof are joined together by a lower frame member, and the upper frame member and the upper edge of the blackboard are joined together. The blackboard device according to claim 1, wherein a reinforcing surface material is rigidly provided in a space formed therebetween. 3. The pivoting position of the blackboard with respect to the frame is set so that the blackboard can be turned over without interfering with the wall surface while the frame is rotated forward by 45 °. The blackboard device according to claim 1 or 2, characterized in that: 4. A spring mechanism, which stores an elastic repulsive force in the extending direction, between the lower end of the side frame member of the frame body and the fixing member located above the lower end. The blackboard device according to claim 1, 2 or 3. 5. The blackboard device according to claim 1, wherein the surface of the blackboard used is painted finish. 6. The blackboard device according to claim 1, wherein the blackboard has a enamel finish. 7. A blackboard device according to claim 1, wherein the blackboard has a bulletin board specification.