JPH0572484U - Movable blackboard - Google Patents

Abstract

(57) [Summary] [Purpose] It is convenient because you can operate the switch to move the black and white body up and down on the spot without moving, in any position in front, left, right or center of the blackboard. [Structure] In a movable blackboard in which the blackboard main body 1 moves up and down by a motor 5, a control switch of the motor 5 is composed of a rotary bar 10 installed parallel to the lower end of the blackboard main body 1 which moves up and down.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a movable blackboard in which a blackboard body moves up and down.

[0002]

[Prior Art]

 The blackboard is mainly installed in the classroom. And at school, there are appropriate positions for teachers, teachers, students, students, and viewers, and there is a movable blackboard that can move up and down to match the blackboard. .

It is also known that this vertical movement mechanism is so-called electric using a motor as a drive source. As an example, as shown in FIG. 6 and FIG. However, the blackboard main body 1 has guide rods 2 on the left and right rear sides, and the guide rods 2 are inserted into a support box 4 fixed to the wall 3 side to enable vertical movement. Further, a motor 5 is built in the support box 4, and a gear 6 provided on the drive shaft of the motor 5 and a rack gear 7 provided on the back side of the blackboard body 1 are meshed with each other.

In this way, when the motor 5 is energized and is rotated in the forward direction so that the gear 6 rotates clockwise in the drawing, the blackboard body 1 is pushed up via the rack gear 7, and the gear 6 is rotated counterclockwise. The blackboard body 1 can be pushed down by turning it around.

A control circuit diagram of the motor 5 according to FIG. 8 is shown. The control switch 8 and the upper and lower limit switches 9 a and 9 b are arranged in the energizing circuit of the motor 5. The control switch 8 is composed of a push button switch and is provided at the lower corner of the blackboard body 1 as shown in FIG. In the illustrated example, the control switch 8 is composed of two push buttons for raising and lowering. When any one of them is pushed, the motor 5 is energized to move the blackboard body 1 and, for example, the support box 4 The upper and lower flanges of the blackboard body 1 come into contact with the limit switches 9a and 9b provided above and below, and the blackboard body 1 stops.

[0006]

[Problems to be solved by the device]

 As described above, in the conventional electrically-operated movable blackboard, the control switch 8 for the motor 5 is provided in the lower corner of the blackboard body 1 or on the wall or the like. If it is provided in the lower corner of the blackboard main body 1 in this way, even if the blackboard main body 1 rises, its position does not become so high, so that even a short person can operate it without any trouble. However, the blackboard uses the left and right sides of the board to the fullest extent, and if the end on the side opposite to the side where the control switch 8 is used is used, move the control switch 8 sideways to the position where it is. It has to move, which is extremely troublesome.

[0007]

[Means for Solving the Problems]

 The purpose of the present invention is to eliminate the inconvenience of the above-mentioned conventional example, and it is possible to operate the switch for moving the black and white body up and down on the spot without moving at any position in front of the blackboard, left and right, center, so it is convenient. To provide a movable blackboard.

In order to achieve the above object, the present invention comprises a movable blackboard in which a blackboard main body moves up and down by a motor, and a control switch of the motor is composed of a rotary bar provided parallel to the lower end of the blackboard main body. Alternatively, in the movable blackboard in which the blackboard main body moves up and down by the motor in the frame, the gist is that the control switch of this motor is composed of a rotating bar arranged in parallel with the lower end of the frame.

[0009]

[Action]

 According to the present invention, a rotating bar serving as a motor control switch is installed along the lower end of the blackboard body or the frame for accommodating the blackboard body, and the rotating bar can be moved in any of the left, right, center positions in front of the blackboard. It can be turned on-the-fly, and a switch can be put in by such turning operation.

[0010]

【Example】

 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. 1 is a front view showing an embodiment of a movable black plate of the present invention, FIG. 2 is a vertical sectional side view of the same as above, FIG. 3 is a control circuit diagram of a motor, and FIGS. The same components as those of the above are denoted by the same reference numerals.

Like the conventional example, the movable blackboard of the present invention has a blackboard body 1 having guide rods 2 on the left and right rear sides, and the guide rods 2 can be inserted into a support box 4 fixed to the wall 3 side to move up and down. Further, a motor 5 is built in the support box 4, and a gear 6 provided on a drive shaft of the motor 5 and a rack gear 7 provided on the back side of the blackboard body 1 are meshed with each other.

A control switch 8 and upper and lower limit switches 9a and 9b are arranged in the energizing circuit of the motor 5, and the limit switches 9a and 9b are provided above and below the support box 4, for example.

In the present invention, the rotating bar 10 is provided along the lower end of the blackboard body 1 and in parallel with the lower end. The rotary bar 10 forms the control switch 8 by rotating in the axial direction. Reference numeral 11 in the figure is a support bracket for such a rotating bar 10. The rotating bar 10 has a length almost equal to the entire length of the lower end of the blackboard body 1, but as shown in the drawing, a chalk box is provided at the center at the lower end of the blackboard body 1. When 12 is provided, the rotary bar 10 may be divided into two parts on the left and right.

Further, the relationship between the rotary bar 10 and the control switch 8 is that, for example, when the rotary bar 10 is turned to the back side, the motor 5 turns forward as a switch for ascending, and when it is turned to the front side, it descends. Turn on the motor 5 as a switch for reverse rotation.

In this way, when it is desired to raise the blackboard body 1, if the rotary bar 10 is turned to the inner side, the switch 5 is turned on to turn the motor 5 forward and the gear 6 forward to rotate the rack gear. The blackboard body 1 is pushed up via 7, and eventually the upper limit switch 9a is turned on to stop the blackboard body 1. If you want to lower the blackboard body 1, turn the rotation bar 10 to the front side, and the motor 5 reverses as a switch for lowering and the gear 6 reverses to rotate the blackboard body 1 via the rack gear 7. Is pushed up, and eventually the upper limit switch 9a is turned on to stop the blackboard body 1.

FIGS. 4 and 5 show a second embodiment of the present invention, in which two plates of front and rear blackboard bodies 1a and 1b are housed in a frame 13, and a sprocket provided on the upper part of the frame 13. A chain 15 for suspending the blackboard main bodies 1a and 1b is wound around 14, and the sprocket 14 is rotationally driven by the motor 5. When one of the blackboard main bodies 1a and 1b is located on the upper side and the other is located on the lower side, the upper and lower ends overlap each other to close the inside of the frame 13, and they are suspended by the chain 15 and serve as weights.

Also in the case of the present embodiment, the control circuit of the motor 5 is the same as that shown in FIG. 3, and the rotary bar 10 is provided along the lower end of the frame 13 in parallel with the lower end thereof. The point that the control switch 8 is formed by the rotation in the axial direction is the same as in the first embodiment.

When it is desired to raise the blackboard main body 1a, the rotary bar 10 is turned to the rear side, and this is used as a switch for raising, the motor 5 is normally rotated, the sprocket 14 is normally rotated, and the chain 15 is inserted. 1a rises, and at the same time, the blackboard body 1b descends. Eventually, the upper limit switch 9a is turned on and the blackboard main bodies 1a and 1b are stopped. If you want to lower the blackboard body 1a, turn the rotating bar 10 to the front side, and this will turn on as a lowering switch, and the motor 5 will reverse and the sprocket 14 will reverse and the blackboard body 1a will descend. At the same time, the blackboard main body 1b rises, and eventually the upper limit switch 9a enters and the blackboard main body 1a stops.

[0019]

[Effect of the device]

 As described above, the movable blackboard of the present invention is convenient because it can be operated by the switch to move the blackboard body up and down on the spot without moving in any position in front of the blackboard. Is.

[Brief description of drawings]

FIG. 1 is a front view showing a first embodiment of a movable blackboard according to the present invention.

FIG. 2 is a vertical cross-sectional side view of essential parts of a movable blackboard according to a first embodiment of the present invention.

FIG. 3 is a control circuit diagram of a motor.

FIG. 4 is a front view showing a second embodiment of the movable blackboard of the present invention.

FIG. 5 is a vertical sectional side view of a main part of a movable blackboard according to a second embodiment of the present invention.

FIG. 6 is a vertical sectional side view of a main part showing a conventional example.

FIG. 7 is a front view showing a conventional example.

FIG. 8 is a control circuit diagram of a motor.

[Explanation of symbols]

1, 1a, 1b ... Blackboard body 2 ... Guide rod 3 ... Wall 4 ... Support box 5 ... Motor 6 ... Gear 7 ... Rack gear 8 ... Control switch 9a, 9b ... Limit switch 10 ... Rotation bar 11 ... Support bracket 12 ... Choke box 13 ... Frame 14 ... Sprocket 15 ... Chain

Claims (2)

[Scope of utility model registration request] 1. A movable blackboard in which a blackboard main body moves up and down by a motor, wherein a control switch of this motor is constituted by a rotary bar provided parallel to the lower end of the blackboard main body which moves up and down. 2. A movable blackboard in which a blackboard main body moves up and down by a motor in a frame, wherein a control switch of the motor is constituted by a rotary bar provided parallel to the lower end of the frame.