JPH08284523A - Opening and closing device of upward opening door - Google Patents

Abstract

PURPOSE: To make it possible to efficiently resist the rapid rotation even for a heavy door and to enable the movement in the horizontal direction of the door smoothly over an extended period of time. CONSTITUTION: A damper 36 resisting rapid rotation is provided downward of a door 2 between the door 2 and a bracket 3. The damper 36, door 2 and bracket 3 are fixed to a downward place separated from a rotational joint place between the door 2 and bracket 32. Rolling bodies 37 and 37 rolling and contacting a side wall 1a of a box 1 are provided to both sides of the lower end of the bracket 32 in a rotatable manner.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for opening and closing an upper opening door, which is constructed such that a door having a front opening portion of a box closed is rotated upward to be horizontal and then moved to the back side of the box for storage. Regarding

[0002]

2. Description of the Related Art A conventional opening / closing device of this type is provided with a pair of guide rails extending in the front-rear direction, which are provided at the upper ends of the inner surfaces of both side walls of a box whose front surface is open, and movably provided on each guide rail. , A bracket that rotatably supports the upper end of the door, and the door with the front opening of the box closed is rotated upward until it becomes horizontal, and then moved to the back side of the box. It is designed to open the front opening of the. On the contrary, the front opening of the box is closed by pulling out the door housed in the box and rotating it downward.

By the way, when the door is closed and rotated, it is very dangerous if the door is rapidly rotated downward. Therefore, in the conventional opening / closing device, a cushioning means is provided between the bracket and the door for resisting rapid downward rotation of the door. For example, in the one disclosed in Japanese Utility Model Publication No. Sho 58-49674, a coil spring is arranged around the rotation axis of the bracket and the door, and the coil spring prevents rapid downward rotation of the door. ing.

[0004]

In the conventional opening / closing device described in the above publication, since the coil spring is arranged around the rotation shaft, only a small rotation moment is obtained as the rotation moment for the door. Therefore, when the weight of the door is relatively large, there is a problem in that it cannot be handled.

Of course, if a coil spring having a large wire diameter is used, it is possible to handle a door having a relatively large weight. However, if the wire diameter is increased, the diameter of the coil spring correspondingly increases. When the diameter of the coil spring increases, it is necessary to dispose the rotation axis of the bracket and the door at a large distance from the door to the back side of the box in order to avoid interference between the coil spring and the door. However, such an arrangement interferes with the top wall of the box when the door rotates. Such interference can be avoided by forming a recess in the top wall or forming a large gap between the door and the top wall, but doing so causes a problem that the appearance is deteriorated.

Therefore, the inventor of the present application uses, for example, a shock-absorbing means having a link mechanism, and one end and the other end of this shock-absorbing means are provided at positions apart from the pivot axis of the door and the bracket downward. I thought about connecting them. This is because a large rotation resistance force can be obtained with respect to the door. However, in this case, the large weight of the door acts on the lower end portion of the bracket, so that the bracket is deformed, and as a result, the smoothness of the movement of the door in the front-rear direction is gradually lost.

[0007]

The present invention has been made in consideration of the above circumstances, and the invention according to claim 1 is arranged at the upper end portions of the inner surfaces of both side walls of the box whose front portion is opened. A pair of guide rails extending in the front-rear direction, a pair of brackets movably supported by the respective guide rails, and rotatably supporting the upper end of the door closing the front opening of the box, and the bracket and the door. In the opening and closing device for an upper opening door, which has one end portion and the other end portion connected to each other and a buffering means for resisting a rapid downward rotation of the door, the bracket of the buffering means and the door The connecting portion is arranged below the pivotal connecting portion between the bracket and the door, and the front and rear side portions of the lower end portion of the bracket sandwiching the connecting portion of the cushioning means are rollingly contacted with the inner surface of the side wall of the box. It is characterized in that the rolling elements rotatably provided to. In this case, it is desirable that the bracket has a vertical flat plate portion along the inner surface of the side wall of the box, and the rolling elements be provided on both front and rear sides of the lower end portion of the vertical flat plate portion.

[0008]

In the invention according to claim 1, when the bracket is about to be deformed due to the weight of the door, the rolling element contacting the inner surface of the side wall of the box prevents this. Further, since the rolling element makes rolling contact with the inner surface of the side wall, the contact of the rolling element does not hinder the movement of the door in the front-rear direction. In the invention according to claim 2, since the vertical flat plate portion of the bracket extends along the inner surface of the side wall, the storage space inside the box can be effectively used. Moreover, the vertical flat plate portion is easily deformed due to the flat plate shape, but the rolling element prevents the deformation.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 1 to 3, reference numeral 1 indicates
A box having a rectangular parallelepiped shape with an opening on the front surface.
Is a door that opens and closes the front opening of the box 1. An opening / closing device 3 for the door 2 is provided between the box 1 and the door 2. In this case, the opening / closing devices 3 are provided as a pair on the left and right sides, but the left and right pairs are configured the same except that they are symmetrical. Therefore, only the opening / closing device 3 on one side will be described here.

A guide rail 31 extending in the front-rear direction of the box 1 is provided at the upper end of the inner surface of the side wall 1a of the box 1. A bracket 32 is movably supported on the guide rail 31 along the guide rail 31. The bracket 32 includes a vertical flat plate portion 32a extending along the side wall 1a of the box 1 and a horizontal flat plate portion 32b extending from the upper end of the vertical flat plate portion 32a along the top wall 1b of the box 1 and away from the side wall 1a. In addition, the retainer 3 is provided in the center of the surface of the vertical flat plate portion 32a facing the outside and slightly above.
3 is fixed. The retainer 33 is movably supported by the guide rail 31 via balls 34 such as steel balls, and thereby the bracket 32 is movably supported by the guide rail 31.

A slide hinge 35 is provided between the door 2 and the bracket 3. This slide hinge 35
Has a configuration similar to that of a known one, and
And a cup portion 35c rotatably connected to the main body portion 35a via an arm 35b, and the rotation center changes in accordance with the rotation angle. The main body portion 35a is fixed to the lower surface of the horizontal flat plate portion 32b of the bracket 32, and the cup portion 35c is fixed to the inner surface of the upper end portion of the door 2. The slide hinge 35 allows the door 2 to rotate freely on the bracket 32, and the upper end portion of the door 2 has the top wall 1b.
It is rotatably connected so as not to buffer.

A damper (buffer means) 36 having a link mechanism is provided between the door 2 and the bracket 32. The damper 36 has the same construction as that of a known one, and therefore its description is omitted, but it is constructed so as to resist the rapid rotation of the door 2 and rotate at a low speed. In this case, the damper 36 may be configured to resist only the downward rotation of the door 2 or may be configured to resist the upward and downward rotation of the door 2.
Further, the damper 36 has one end portion and the other end portion thereof so that the damper 36 can effectively resist the rapid rotation of the door 2.
The door 2 and the bracket 32 are each fixed to a position distant downward from a pivotal connection position.

At the lower end of the vertical flat plate portion 32a of the bracket 32, rolling elements 37, 37 that rotate about an axis extending in the vertical direction are provided at both front and rear sides thereof. As the rolling element 37, it is desirable to use a cylindrical roller as in this embodiment, but a sphere may be used. The rolling element 37 rolls and comes into contact with the side wall 1a as the bracket 32 moves in the front-rear direction. Reference numeral 38 is a guide roll, which rolls into contact with and supports the door 2 when the door 2 is moved to the back side of the box 1.

In the opening / closing device 3 having the above-described structure, when the door 2 is rotated downward, the bracket 32 receives a deforming force due to the weight of the door 2 transmitted through the damper 36. For example, the front and rear side portions of the bracket 32 are subjected to a torsional deformation force that moves inward and outward. The guide rail 31 is connected to the outer surface of the bracket 32, and the damper 36 is connected to the inner surface of the bracket 32, so that the guide rail 31 and the damper 36 move in the inner and outer directions of the box 1 (left and right directions in FIG. 3). ) Is away. Therefore, a force that pushes the bracket 32 outward is applied to the lower end of the bracket 32. However, these forces are supported by the side wall 1a of the box 1 via the rolling elements 37. Therefore, the deformation of the bracket 32 can be prevented. Therefore,
The door 2 can be smoothly moved in the front-rear direction for a long period of time.

Further, when the door 2 is moved to the back side of the box 1, if only one of the left and right sides of the door 2 is pushed, the door 2 is inclined and it becomes difficult to move smoothly. However, in the opening / closing device 3, the rolling element 37 prevents the door 2 from tilting, and the rolling element 37 guides the bracket 32 in the front-rear direction.
Therefore, the door 2 can be smoothly moved to the back side of the box 1.

Further, the bracket 3 is formed by the rolling elements 37.
Since the deformation of 2 can be prevented, a thin plate material can be used as the bracket 32, and the vertical flat plate portion 3
2a is used. By arranging the vertical flat plate portion 32a along the side wall 1a, the internal space of the box 1 can be effectively used.

[0017]

As described above, according to the first aspect of the invention, it is possible to effectively resist the downward rotation of the door and prevent the bracket from being deformed. The movement in the front-rear direction can be improved over a long period of time, and the rolling element guides the movement of the bracket in the front-rear direction, so that the door can be moved more smoothly in the front-rear direction. The effect is obtained. Also,
According to the second aspect of the invention, it is possible to effectively use the internal space of the box.

[Brief description of drawings]

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

FIG. 2 is a side view showing the embodiment with the door closed.

FIG. 3 is a view taken in the direction of arrow X in FIG.

[Explanation of symbols]

 1 Box 1a Side wall 2 Door 3 Opening / closing device 31 Guide rail 32 Bracket 35 Sliding hinge 36 Damper (buffer means) 37 Rolling element

Claims (2)

[Claims] 1. A pair of guide rails, which extend in the front-rear direction, are arranged at the upper ends of the inner surfaces of both side walls of the box whose front face is open, and each of the guide rails are movably supported by the guide rail. A pair of brackets for rotatably supporting the upper end of the door to be closed, and one end portion and the other end portion of the bracket and the door, respectively, and a cushioning means for resisting rapid downward rotation of the door. In the opening and closing device of the upper opening door provided with, the connecting portion of the bracket and the door of the buffer means is arranged below the pivotal connecting portion of the bracket and the door, and the connecting portion of the buffer means is An opening / closing device for an upper opening door, wherein rolling elements rollingly contacting an inner surface of a side wall of the box are rotatably provided on both front and rear sides of a lower end portion of the bracket sandwiched therebetween. 2. The bracket has a vertical flat plate portion along the inner surface of the side wall of the box, and the rolling elements are provided on both front and rear sides of a lower end portion of the vertical flat plate portion. The opening / closing device for opening the upper door according to item 1.