JPH0468931B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a device for rotatably supporting a rotating board such as a blackboard or bulletin board.

[Conventional technology]

Conventionally, in order to effectively utilize both the front and back sides of a blackboard, etc., devices have been provided that support such a blackboard so that it can rotate around a predetermined axis (see Utility Model Application Publication No. 81933/1983). etc.).

An example is shown in FIG. In the figure, reference numeral 101 denotes a pair of support bodies disposed on the front side and back side of the figure. Both support bodies 101 are connected by a crosspiece or the like extending in a direction perpendicular to the figure, and the heads of both support bodies 101 are The blackboard 102 can be rotated around the horizontal axis connected to it.
is installed. According to such a device,
By rotating the blackboard 102 around the horizontal axis and turning it over, the blackboard 102 can be turned over without turning the entire support device.
Both sides of 02 can be used.

[Problem to be solved by the invention]

In the above device, in order to rotate the blackboard 102, the entire support device must be separated from the wall 103 by a predetermined distance l (more specifically, 1/2 or more of the height of the blackboard 102). Therefore, in the case of a fixed type support device, a large space must be provided between the support device and the wall, which tends to get in the way even when a blackboard or the like is placed vertically. On the other hand, in the case of a mobile support device as shown in the figure,
Although the blackboard or the like can be brought close to the wall 103 in a vertical state, it is necessary to move the entire support device to the above position when rotating the blackboard, which makes the work extremely troublesome.

In view of these circumstances, the present invention aims to provide a support device that allows a rotating board such as a blackboard to be turned over without any inconvenience while it is installed on a wall or placed in a position close to a wall. purpose.

[Means to solve the problem]

The present invention provides a rotary plate support device for supporting a rotary plate on a main body installed in an upright state so that the rotary plate can be moved into and out of contact with the main body and rotatable around a horizontal axis. a first link rotatably attached to the first link; a second link rotatably attached to the first link; and a predetermined portion on the second link and a predetermined portion of the main body. and a third link connecting the second part to the third link.
A rotary plate is attached to a portion of the link that moves approximately horizontally so as to be rotatable about a horizontal axis.

[Effect]

In the above configuration, the support mechanism is moved to separate the rotary plate from the main body, and in this state, the rotary plate is rotated and turned over, and then the back side of the rotary plate is made usable by moving it closer to the main body and storing it again.

Furthermore, in the above device, most of the vertical load due to the rotary plate's own weight is supported by the third link,
The rotating plate moves smoothly in the horizontal direction (approach/separate direction).

〔Example〕

A first embodiment of the present invention will be described based on FIGS. 1 to 5.

The illustrated blackboard support device includes two main body frames 1 made of angle iron and a support mechanism 2.
It is fixed in a symmetrical position.

The support mechanism 2 includes a pair of flat plate-shaped first links 21 and a second link 22, and a pair of third links 23 made of square pipes on the left and right sides,
The first link 21 and the second link 22 have the same shape,
They have the same dimensions. One end of each first link 21 is rotatably attached to the main body frame 1 via a pin 3, and one end of the second link 22 is rotatably attached to the other end via a pin 4. It is being

The third link 23 has its upper end and lower end connected to a predetermined intermediate portion of the second link 22 and the lower end of the main body frame 1 via pins 5 and 6, respectively, and rotates about the pin 6. There is a handle 23 at the top of the side for operation.
A is provided. Further, the lower portions of the third links 23 are connected to each other by a reinforcing frame 23b.

The mounting position using the pins 5 and 6 is such that when the third link 23 rotates, the first and second links 22 and 23 are bent into a mountain shape, and the second
The lower end of the link 22 is set so as to draw a locus as shown by the dashed line in FIG. That is, in this structure, the lower end of the second link 22 is horizontally spaced apart from the main body frame 1 up to a certain point, and thereafter moves in an upward curve. .
Then, the second link 22 that performs such a movement
Both sides of a blackboard 7 are attached to the lower end of the board.

The mounting structure of this blackboard 7 is shown in FIG. Blackboard 7
A slot 7a is provided in the center of both sides of the mounting member 8, and a mounting member 8 having a protruding pin 8a is fixed in the slot 7a. On the other hand, a through hole is provided at the lower end of the second link 22,
With the pin 8a inserted into this through hole,
The second link 22 and the blackboard 7 are connected by screwing a screw 9 onto the pin 8a from the outside. This structure allows the blackboard 7 to rotate around a horizontal axis connecting the lower ends of the second links 22 (as indicated by the two-dot chain line in FIG. 1).

On the other hand, a locking mechanism 10 as shown in FIG. 5 is provided at a predetermined portion of the main body frame 1. This lock mechanism 10 includes a shaft 11 that is pivotally supported by both main body frames 1, a handle 12 and a lock member 13 that are integrally fixed to this shaft 11.
The lock member 13 has a notch 13a of a predetermined shape. On the other hand, a predetermined portion of the third link 23 is provided with a protrusion 23c that protrudes inward of the device, and when the blackboard 7 is in the storage position (FIGS. 2 and 3), which will be described later, the shaft 11 rotates to connect the protrusion 23c and notch 13a.
When the blackboard 7 is engaged with the blackboard 7, the blackboard 7 is locked.

In addition, cushion rubber 14 is provided at the upper end of the main body frame 1 and on the front side of the reinforcing frame 23b, and the cushion rubber 14 contacts the back surface of the blackboard 7 in the stored state.
is installed.

Next, the operation of this support device will be explained.

First, in the stored state (FIGS. 2 and 3) in which the blackboard 7 is close to the main body frame 1, in contact with the cushion rubber 14, and is locked by the locking mechanism 10 (FIGS. 2 and 3), the blackboard 7
can be used.

From this state, turn the shaft 11 of the lock mechanism 10 to remove the lock member 13 from the protrusion 23c, then grasp the handle of the blackboard 7 and rotate the third link 23 to the right in FIG. The lower end of the link 22 (pin 8a) of No. 2 moves horizontally, and the blackboard 7 moves forward (to the right in Figure 1).
is drawn out. At this time, most of the vertical load due to the weight of the blackboard 7 itself is dispersed into a force that compresses the third link 23, so the rotation of the third link 23, that is, the horizontal movement of the blackboard 7 It is performed smoothly with only a slight external force.

On the other hand, if such horizontal movement continues and the support point of the blackboard 7 (i.e. pin 8a) moves from the horizontal movement area to the area where it moves diagonally upward (first
(two-dot chain line in the figure), the force acting on the blackboard 7 to return it to the main body 1 due to its own weight causes the blackboard 7 to
The drawer is limited to approximately the position shown in FIG. Then, in this position, the back side of the blackboard 7 can be used by turning the blackboard 7 180 degrees around the pin 8a, pushing it into the main body 1, and locking it again.

As described above, in this support device, the blackboard 7 is once pulled out from the main body frame 1, and the blackboard 7 is held in this state.
Since the blackboard 7 is turned upside down, both sides of the blackboard 7 can be used while being directly installed on the wall W as shown in the figure, without having to move the entire device far from the wall W as in the conventional case. Furthermore, even if the entire device is made movable, it can be used at a position close to the wall W without any inconvenience.

Moreover, according to the support mechanism 2, most of the load caused by the blackboard 7 is supported by the third link 23, so the bending load, etc. applied to the base end of the first link 21 is extremely small, and the support mechanism 2 The overall deflection is suppressed, the simple structure with fewer members reduces the burden on strength, and the horizontal movement of the blackboard 7 becomes smooth.

Furthermore, since the support point of the blackboard 7 traces the trajectory shown by the dashed-dotted line in Figure 1, the movement in the horizontal direction is regulated by the weight of the blackboard 7, so there is no risk of overextension even without providing a stopper. , the blackboard 7 can be safely pulled out. Further, since the amount of rotation of the third link 23 when pulling out the blackboard 7 is small, the user can pull out the blackboard 7 with a small amount of operation without making any exaggerated movements.

Note that the entire device is structured upside down, that is, the first link 21 and the second link 22 are bent in a valley shape, and the second link 22 and the upper part of the main body frame 1 are bent in the third direction. Even if the structure is such that they are connected by links 23, the blackboard 7 can be moved in the horizontal direction in the same way. However, in this case, the trajectory of the support point of the blackboard 7 is upside down from the dashed line in FIG. 1, and ultimately draws a downward curve, so the weight of the blackboard 7 does not act in the direction to restrict its movement. Therefore, in this case, it is necessary to provide a stopper (for example, connecting the blackboard 7 and the main body frame 1 with a chain) to restrict the movement.

The other device side will be explained based on FIGS. 6 and 7. Here, a support frame (support member) 30 is connected to a window frame-shaped main body frame 31 fixed to a wall W via a support mechanism 32. A blackboard 7 is supported. In addition, in the figure, 30a is a handle fixed to the support frame 30, 14 is a cushion rubber, 1
5 is pollination.

The support mechanism 32 includes a first cross link 321 and a second cross link 322 of the same size on the left and right sides, and the central portions of these links 321 and 322 are rotatably connected to each other by a pin 34. 1st
The upper ends of the cross link 321 and the second cross link 322 are rotatably connected to the upper part of the support frame 30 and the upper part of the main body frame 31 via pins 35, respectively, and the lower ends of the links 321 and 322 are
Pins 32a and 32b are provided, respectively.
On the other hand, vertical slots 31a and 30b are formed in the lower part of the inner surface of the main body frame 31 and the lower part of the outer surface of the support frame 30, respectively, and the pins 32a and 32b slide into these slots 31a and 30b. Possibly inserted.

Further, a gas spring 36 is attached to the upper part of the main body frame 1 so as to be rotatable around its upper end, and a piston rod 3 of this gas spring 36 is attached.
6a is connected to a predetermined portion of the second cross link 322.

Even in such a structure, the first cross link 321 and the second cross link 322 rotate in different directions while the gas spring 36 expands and contracts, and the pins 32a and 32b at the lower ends of the first cross link 321 and the second cross link 322 rotate in different directions.
By sliding within 1a and 30b, the blackboard 7 moves toward and away from the main body frame 31 in the horizontal direction together with the support frame 30. Moreover, since the blackboard 7 is rotatable about the shaft 33 relative to the support frame 30, the support frame 30 can be moved from the storage position indicated by the two-dot chain line in FIG. By pulling out the blackboard 7 until the blackboard 7 is pulled out, turning the blackboard 7 180 degrees at this position, and pushing it in again, both sides of the blackboard 7 can be used.

Further, since a force is applied by the gas spring 36 in the direction in which the gas spring 36a protrudes, that is, in the direction in which the blackboard 7 approaches the main body frame 31, the blackboard 7 can be used in a stable state in the storage position. be able to.

Next, a third embodiment will be described based on FIG. 8. The support mechanism 37 in this embodiment includes a downward rotation link 371 and a regulation link 372, and the lower end of the downward rotation link 371 (the left end in the position indicated by the solid line in FIG. The support frame 30 for the blackboard 7 is attached to the upper end so as to be rotatable about a horizontal axis.

One end of the regulation link 372 is rotatably connected to a predetermined portion of the downward rotation link 371 via a pin 40, and the other end is provided with a pin 37a. On the other hand, vertical slots 38a are formed on both inner surfaces of the main body frame 38, and the pin 37a is slidably fitted into the slots 38a. The pin 38a hits the lower edge of the slot 39a, thereby restricting the downward rotation of the downward rotation link 371 (as shown).

Further, the above-mentioned gas spring (biasing means) 36 is rotatably attached to the lower part of the main body frame 39, and the piston rod 36a is connected to the link 372.
The downward rotation link 371 is connected to a predetermined portion of the blackboard 7 by this gas spring 36.
is urged in a direction approaching the main body frame 38.

Even in such a structure, the downward rotation link 371 rotates downward, and the regulating link 372 is interlocked with it, causing the gas spring 36 to contract, so that the blackboard 7 resists the biasing force of the gas spring 36. and the support frame 30 is the main body frame 3
8 horizontally and downwardly. Therefore,
By rotating the support frame 30 and the blackboard 7 together at this separated position, the blackboard 7 can be turned over. Also, instead of rotating the support frame 30, the second
As in the embodiment, the blackboard 7 may be rotated relative to the support frame 30.

Another example of the device will be explained based on FIG. 9. Here, the same main body frame 41 and support frame 3 as above are shown.
0 and a pair of left and right arms (upward rotating members) 42
It is connected with. This arm 42 is bent approximately in a horizontal position, and its upper end (the left end in the solid line position in the figure) is rotatably attached to the upper part of the main body frame 41 via a pin 43, and its lower end is rotatably attached to the upper part of the main body frame 41. A support frame 30 is rotatably attached. Further, a gas spring (supporting means) 36 is rotatably connected to an intermediate portion of the main frame 41, and a piston rod 36a of the gas spring 36 is rotatably connected to a predetermined portion of the arm 42 via a pin 44. has been done.

Even in such a structure, when the arm 42 rotates around the pin 43, the blackboard 7 and the support frame 30 are separated horizontally and upwardly from the main body frame 41. In this spaced position, the piston rod 36a is moved by the gas spring 36.
Since the arm 44 is pushed in the direction in which it protrudes, that is, in the upward direction, this force supports the support frame 30 and the blackboard 7 in the deployed position. That is, this structure has the advantage that the above effects can be obtained with a simple structure consisting only of the gas spring 36 and the arm 44. Moreover, by bending the arm 42 as described above, the force of the gas spring 36 can be applied in a direction in which the blackboard 7 approaches the main body frame 41 in the storage position shown by the two-dot chain line in the figure.

Note that the rotating board in the present invention is not limited to a blackboard.
It can be applied to boards that use both the front and back sides, such as bulletin boards. In the other device example described above, the blackboard 7 may be rotated about a vertical axis with respect to the support frame 30.

〔Effect of the invention〕

As described above, in the present invention, the device main body and the rotary plate are connected by a support mechanism, and the rotary plate moves toward and away from the main body at least horizontally, and rotates about an axis in the vertical direction. Therefore, even when the main body is installed on a wall or in a position close to a wall, the rotary plate can be easily turned over when separated from the main body.

Moreover, in the present invention, the vertical load due to the rotary plate's own weight is almost supported by the third link, and although the structure is simple, the strength burden on the entire support mechanism is reduced, and the rotation This has the effect of allowing the board to move smoothly in the horizontal direction.

[Brief explanation of the drawing]

FIG. 1 is a side view showing the expanded state of the blackboard support device in the first embodiment of the present invention, FIG. 2 is a side view showing the device in the stored state, and FIG. 3 is a front view of the device. Figure 4 is a cutaway front view of the blackboard mounting structure in the same device, Figure 5 is a perspective view of the locking mechanism in the same device, Figure 6 is a side view of a blackboard support device in another example of the device, and Figure 7 is the same device. 8 is a side view of a blackboard support device in another device example, FIG. 9 is a side view of a blackboard support device in another device example, and FIG. 10 is a side view of a conventional blackboard support device. . 1, 31, 38, 41...Main frame, 2,
32, 37...Support mechanism, 7...Blackboard (rotary board),
21...first link, 22...second link,
23...Third link, 30...Support frame, 36...
...gas spring (biasing means and supporting means),
321...First cross link, 322...Second cross link, 371...Downward rotation link (downward rotation member), 372...Regulation link (regulation member), 4
2...Arm (upward rotating member).

Claims (1)

[Claims] 1. In a rotating plate support device for supporting a rotating plate on a main body installed in an upright state so that the rotating plate can be moved into and out of contact with the main body and can be rotated around a horizontal axis,
A first link rotatably attached to the main body about a horizontal axis, a second link rotatably attached to the first link, and a predetermined portion on the second link. and a third link connecting the body to a predetermined portion of the main body, and a rotary plate is attached to a portion of the second link that moves approximately horizontally so as to be rotatable about a horizontal axis. A support device for a rotating plate.