JPH0659256B2 - Supporting device for rotating plate - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for rotatably supporting a rotating plate such as a blackboard or a bulletin board.

[0002]

2. Description of the Related Art Conventionally, in order to effectively utilize both front and back surfaces of a blackboard or the like, there has been proposed a device which supports such a blackboard or the like so as to be rotatable about a predetermined axis.

For example, in Japanese Utility Model Laid-Open No. 52-44837, a holder is attached to an attachment body so as to be rotatable about a horizontal axis, and a blackboard or the like is pivotally attached to an intermediate portion of the holder so as to be rotatable. In addition, a coil spring for urging the holding body in the developing direction is provided, and a locking tool for switching the holding body to a fixed state and a released state is provided. According to such a device, by switching the locking tool to the unlocked state and deploying the holding body,
This holder can be held in the expanded state by the elastic force of the coil spring, and a blackboard or the like can be used in this state.

[0004]

In the above device, since the coil spring for urging the holding body in the developing direction is provided, the holding body is held against the urging force of the coil spring in order to hold the holding body in the closed state. A locking device is required to secure the body in the closed position. This locking tool not only increases the initial cost of the device, but also has the disadvantage that the operation of opening and closing the holding body is troublesome.

In view of such circumstances, the present invention has a simple structure and can keep the rotary plate closed to the main body side without using a special locking tool and the like. It is an object of the present invention to provide a device that is easy to operate and deploy.

[0006]

According to the present invention, there is provided a rotary plate for supporting a rotary plate on a main body installed in an upright state so that the rotary plate can be brought into contact with and separated from the main body and can be rotated. In the supporting device, an upper end portion is attached to the main body so as to be rotatable about an axis parallel to the rotational axis direction of the rotary plate, and a rotary member is attached to the lower end portion so that the rotary plate is rotatable. A portion rotatably attached to the main body about an axis parallel to the rotation axis direction of the rotary plate, and the other end portion to an intermediate portion of the rotation member and an axis parallel to the rotation axis direction of the rotation plate. And an expansion / contraction member having elastic force in the extension direction at all times. The expansion / contraction member and the rotation member are connected to each other in a closed position. From the straight line connecting the rotation center axis of the rotation member with respect to the main body and the rotation center axis of the expansion and contraction member with respect to the main body It is obtained by setting the position shifted in the overhang direction opposite to the direction of the rotating member.

The "intermediate part" of the rotating member does not necessarily mean the midpoint of a line segment connecting both ends of the rotating member, but indicates an appropriate position between the both ends. To do.

[0008]

According to the above construction, by rotating the rotating member in the direction in which the lower end of the rotating member is separated from the main body, the expanding member holds the rotating member in the expanded state by the extension force of the elastic member. It can be used by rotating the rotating plate. vice versa,
From this state, the rotary plate can be returned to the storage position by rotating the rotary member in the direction in which the lower end of the rotary member approaches the main body. At this time, since the expandable member is connected to the intermediate portion of the rotating member in the closed position at a position displaced in the direction opposite to the bulging direction with respect to the straight line connecting both rotating center axes of the main body, The elastic force of the expansion / contraction member in the extension direction acts as a force for moving the rotating member in the closing direction, and thus the rotating member and the rotating plate are held in the closed state.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to the drawings.

The illustrated blackboard support device includes a pair of left and right body frames 41 made of chevron steel, and both body frames 41.
Are fixed to the wall W in a standing state extending in the vertical direction at positions aligned with each other in the depth direction of the drawing.

As shown in FIG. 2, the blackboard 7 is fixed in a supporting frame 30, and the supporting frame 30 is provided with a pair of left and right (a pair of front and rear in FIG. 1) arms (rotating members) 42. It is connected to the body frame 41.

The arm 42 is formed in a substantially doglegged shape so that its middle portion projects in a direction opposite to the projecting direction (counterclockwise direction in FIG. 1).
Is attached to the main body frame 41 via a pin 43 so as to be rotatable about a horizontal axis, and the support frame 30 is attached to the lower end (right end in the solid line position in FIG. 1).
Is attached via a pin 45 so as to be rotatable about a horizontal axis.

A head end (lower end) of a gas spring (extension member) 36 is rotatably mounted around a horizontal axis at an intermediate portion of the main body frame 41, and a tip of a piston rod 36a of the gas spring 36 is attached. The (upper end) is connected to the bent portion of the middle portion of the arm 42 via a pin 44 so as to be rotatable about a horizontal axis. That is, the tip of the piston rod 36a is connected to a position in the arm 42 that is displaced in a direction opposite to the direction in which the arm 42 extends (counterclockwise direction in FIG. 1) with respect to the straight line connecting the pins 43 and 37 at the closed position. Has been done.

The gas spring 36 is conventionally known and is provided between the main body frame 41 and the support frame 30 in a state where it always has an elastic force in the extension direction.

In FIG. 1, reference numeral 14 denotes a cushion rubber which comes into contact with the blackboard 7 in the closed position.

Next, the operation of this device will be described.

First, in the state where the support frame 30 is close to the main body frame 1 and the blackboard 7 is in contact with the cushion rubber 14 (two-dot chain line state in FIG. 1), the tip of the piston rod 36a of the gas spring 36 is Since the arm 42 is connected to a position displaced inward (left side in FIG. 1) from a straight line (generally vertical line) connecting the pins 43 and 37, the elastic force of the gas spring 36 in the extension direction causes the arm 42 to move. Figure 1
It acts as a force to rotate in the clockwise direction. Therefore,
In this state, the elastic force of the gas spring 36 causes the support frame 30 and the blackboard 7 to move in the direction in which the blackboard 7 is pressed against the cushion rubber 14 (closed direction) without providing a special locking mechanism such as a locking tool. ), The blackboard 7 is fixed in the closed position indicated by the chain double-dashed line in FIG.

From this state, when the support frame 30 or the like is gripped and the arm 42 is rotated in the developing direction (counterclockwise direction in FIG. 1) against the elastic force of the cushion rubber 14, the gas spring 36 is temporarily turned. Although it contracts, when it exceeds a certain point, it starts to expand, and the elastic force of the gas spring 36 in the extending direction is switched to a force for rotating the arm 42 in the deploying direction. Due to this force, the arm 42 is held in a substantially horizontal deployed position as shown by the solid line in FIG. Therefore, in this state, the support plate 30 can be used by turning it around the pin 45 and turning it over.

As described above, in this device, not only the gas spring 36 is used for holding the expanded position, but also the piston rod 36a of the gas spring 36 is formed in the middle portion of the arm 42 rather than the straight line connecting the pins 43 and 37. Since it is also used for holding the closed position by connecting the support plate 30 and the blackboard 7 to the closed position without connecting a special locking mechanism by connecting them in a position displaced in the direction opposite to the projecting direction. Can be held at. In addition, during the unfolding operation and the closing operation, the lock
There is no need for an operation to switch the release.

The rotating plate in the present invention is not limited to the above blackboard, but can be applied to a plate using both front and back surfaces such as a bulletin board. Further, in the above embodiment, the structure in which the rotary plate is rotated about the horizontal axis has been shown, but the present invention can be applied to the structure in which the blackboard 7 is rotated about the vertical axis in the same manner as above.

[0021]

As described above, according to the present invention, the rotating member is elastically moved in the extension direction of the extending member by devising the connecting position of the expansion member and the rotating member. Since it can be fixed at both the expanded position and the closed position, it is not necessary to specially provide the lock mechanism for holding the closed position, and therefore the initial cost of the device can be reduced. Further, by eliminating the operation of the lock mechanism and the like, there is an effect that the closing operation and the expanding operation can be performed more easily.

[Brief description of drawings]

FIG. 1 is a side view showing an embodiment of the present invention.

FIG. 2 is a perspective view of the blackboard and its support frame in the above embodiment.

[Explanation of symbols]

 7 Blackboard 36 Gas Spring (Expansion / contraction member) 37 Pin (Center of rotation of expansion / contraction member with respect to main body) 41 Body frame 42 Arm (Rotation member) 43 Pin (Center of rotation of rotation member with respect to main body) 44 Pin (Expansion / contraction) (Connecting position of the member and the rotating member)

Claims (1)

[Claims] 1. A support device for a rotary plate for supporting a rotary plate on a main body installed in an upright state such that the rotary plate can be brought into contact with and separated from the main body, and is rotatable. A rotating member that is rotatably mounted around an axis parallel to the rotating shaft direction of the rotating plate, and has a lower end portion to which the rotating plate is rotatable, and a rotating shaft of the rotating plate at one end of the main body. Is mounted rotatably around an axis parallel to the direction, and the other end is rotatably connected to an intermediate portion of the rotary member in an axial direction parallel to the rotary axis direction of the rotary plate, and An expanding / contracting member having an elastic force in the extension direction, and a connecting position between the expanding / contracting member and the rotating member is a rotation center axis of the rotating member with respect to the main body and a main body with the rotating member in the closed position. The direction of extension of the rotating member should not be greater than the straight line connecting the center axis of rotation of the elastic member with respect to A support device for a rotating plate, characterized in that it is set in a closed position.