JPH0236866Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a door opening/closing device for opening and closing an elevating type two-panel door provided, for example, in a draft chamber.

[Technical background of the invention and its problems]

Some draft chambers installed in chemical laboratories and the like have an opening at the front of the processing chamber provided in the draft chamber main body, and a door made of a glass plate or the like is provided in the opening so that it can be raised and lowered. When performing experimental processing in the processing chamber, the door is lowered to close the opening of the processing chamber, and when the operator prepares for the experiment and cleans up afterward, the door is raised to open the opening. That's what I do.

However, when using a lift-type door for the opening of the processing chamber, the ceiling of the room in which the draft chamber is installed is low or the ceiling has piping, making it impossible to increase the height of the draft chamber. When there is a limit to the space for storing the door raised above the draft chamber main body, the door is divided into an upper door and a lower door to form a two-door configuration. In other words, the door storage space (height) in the upper part of the draft chamber body can be reduced by half compared to the case of a single door.

Conventionally, in order to open and close the upper and lower doors of this two-door type, an upper door 3 and a lower door 4 are provided at the opening 2 of the draft chamber main body 1, as shown in FIGS. 1 to 3. Ropes 5, 5 are connected to both sides of each rope, and these ropes 5, 5 are wound around pulleys 6, 6 attached to the draft chamber body 1, and further weights (balance weights) 7, 7 is suspended and supported, and as the upper and lower doors 3 and 4 move up and down, the weights 7 and 7 move up and down while balancing the weight with the doors, thereby opening and closing both doors 3 and 4. A switchgear designed to do this is used.

However, in this door opening/closing device, the weights 7, 7 are connected and supported for each door 3 and lower door 4, so both doors 3, 4 are supported by the ropes 5, 5 and the weights 7, 7.
Due to this, it is not possible to move up and down together.
It is necessary to raise and lower both doors 3 and 4 individually to open and close them, which makes opening and closing the doors very troublesome. There is also a method in which a hook 8 is provided protruding from the lower edge of the lower door 4, and when the lower door 4 is raised, the upper door 3 is hooked onto the hook 8, but in this case, the lower door 4 is raised. During the opening and closing process, the weight of the upper door 4 is added, making it difficult to open and close the door smoothly, resulting in discomfort. This is both doors 3,
The same applies when closing 4. Furthermore, each door 3, 4
There is a problem in that two weights 7, 7 are required for each weight, and the number of weights increases overall.

[Purpose of invention]

This invention was made in view of the above circumstances, and 2.
To provide a door opening/closing device which facilitates opening/closing operations of an upper door and a lower door constituting a single-panel door, and reduces the number of weights used to raise and lower both doors.

[Summary of the idea]

The door opening/closing device of the present invention has two ropes connected to both ends of the upper door wrapped around a fixed pulley for the upper door, and then a weight is connected and supported, and the ropes are connected to both ends of the lower door. Two ropes are wound around a lower door pulley, which is a fixed pulley attached to the case, and a lower door pulley, which is a movable pulley attached to the weight. That is, the upper door and the lower door can be smoothly raised and lowered together using one weight.

[Example of idea]

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

Figures 4 to 11 show an embodiment in which the present invention is applied to a door opening/closing device for a draft chamber. Figure 4 is a front view of the draft chamber, and Figures 5 to 7 are cross-sectional views of the same. Front view, Figures 8 to 11
The figure shows the state in which the rope is wound.

In the figure, reference numeral 11 denotes a draft chamber main body with an opening 12 in the front part, 13 a processing chamber provided inside the draft chamber main body 11 facing the opening 12, and 14 an opening of the draft chamber main body 11. Part 1
An upper door 15 is provided at the upper part of the opening 12 so as to be movable up and down. The upper door 14 and the lower door 15 are horizontally long rectangles having the same length and width, and are formed using transparent glass plates so that the inside of the processing chamber 13 can be seen through. A door storage section 16 is provided in the upper part of the draft chamber body 11, located above the opening 12, in which the upper door 14 and the lower door 15 are stored when raised. In addition, in the figure, 17 is an exhaust duct for discharging the exhaust gas generated in the experimental processing inside the processing chamber 13 to the outside, 18 is a water tap provided in the processing chamber 13, and 1
9 is a gas valve.

Next, the door opening/closing device will be explained. 20 in the diagram
A, 20B are the first pulleys for the upper door, 21A, 21
B is a second pulley, 22A and 22B are first pulleys for the lower door, 23A and 23B are second pulleys, 24A and 24B are third pulleys, and 25 is a weight. Upper side of one end of the opening 12 of the draft chamber body 11 (upper side of one end of the door storage section 16)
is provided with first pulleys 20A, 20B for the upper door and first pulleys 22A, 22B for the lower door, and shafts 26, 26 supporting these pulleys 20A, 20B, 22A, 22B are connected to the draft chamber body 11. It is supported by supports 27, 27 attached to the ceiling. Upper door second pulleys 21A and 21B are provided above the other end of the opening 12 (upper part of the other end of the door storage section 16).
and second pulleys 23A and 23B for the lower door are provided,
Shafts 28, 28 supporting these pulleys 21A, 21B, 23A, 23B are connected to the draft chamber body 1.
It is supported by supports 29, 29 attached to the ceiling of 1. The third pulleys 24A, 24B for the lower door are provided below the second pulleys 23A, 23B for the lower door, and the shaft 30 supporting the third pulleys 24A, 24B is mounted on the upper surface of the weight 25. It is supported by attached supports 31, 31. The weight 25 is provided in a space on the other end side of the opening 12 so as to be movable up and down. In addition, 32A in the figure is the first rope for the upper door,
32B is also the second rope. The first rope 32A has one end connected and fixed to one edge of the upper door 14, and then pulled up to one end of the door storage section 16 and wrapped around the first pulleys 20A and 20B for the upper door. , pass it horizontally to the other end of the door storage section 16 and wrap it around the second pulley 21A for the upper door, and then pull it down further and connect and fix the other end to the fixed ring 34 attached to the top surface of the weight 25. . The second rope 32B is
After its one end is connected and fixed to the other end edge of the upper door 14, it is pulled up and wrapped around the first pulley 21B for the upper door, and further pulled down, and the other end is connected and fixed to the fixed ring 34 of the weight 25. Note that the other ends of the ropes 32A and 32B are tied together with a member 37. As a result, both ends of the upper door 14 are connected to the first and second ropes 3 connected to the weight 25.
It is supported by 2A and 32B. Further, the weight 25 is suspended and supported by ropes 32A and 32B. In this case, the first pulleys 20A, 20B for the upper door and the second
The pulleys 21A and 21B are fixed pulleys. moreover,
In the figure, 33A is the first rope for the lower door, and 33B is the second rope. The first rope 33A is
One end is connected and fixed to one end edge of the lower door 15, pulled up to one end of the door storage section 16, wrapped around the first pulleys 22A and 22B for the lower door, and then horizontally moved to the other end of the door storage section 16. , and wrap it around the second pulley 23A for the lower door, then lower it and wrap it around the third pulley 24A for the lower door attached to the weight 25, then pull it up and wrap the other end around the draft chamber main body. It is connected and fixed to a fixed ring 35 attached to the ceiling of No. 11. Second rope 33B
is connected and fixed at one end to the other end edge of the lower door 15, further pulled up, wrapped around the second pulley 23B for the lower door, lowered, wrapped around the third pulley 24B for the lower door, and then pulled up. It is connected and fixed to a fixed ring 35. Note that the other ends of the ropes 33A and 33B are tied together with a member 37. Thereby, both ends of the lower door 15 are supported by the first and second ropes 33A and 33B connected to the weight 25. In addition, the weight 25 is connected to the ropes 33A, 3
It is also suspended and supported by 3B. In this case, the first pulleys 22A, 22B and the second pulley 23 for the lower door
A, 23B are fixed pulleys, and the third pulley 24A,
24B becomes a movable pulley. In this way, upper door 1
4 and the lower door 15 are connected to one weight 25 which is a balance weight. In the figure, reference numerals 36 and 36 indicate rope guide rails provided at both ends of the opening 12.

Here, the relationship between the doors 14, 15 and the weight 25 will be described with reference to FIG. The upper door 14 rises to the door housing part 16 with a lifting distance h equal to the height of the upper door 14. Since the lower door 15 passes through the upper door 14 and rises to the door storage section 16, the vertical distance is 2 hours, which is twice its height. Looking at the support relationship between the upper door 14 and the weight 25, the upper door 14 supports the weight 25 via second pulleys 21A and 21B, which are fixed pulleys. In this case, the vertical distance of the upper door 14 is h
Therefore, the lifting distance of the weight 25 is also h based on the condition of a fixed pulley. Looking at the support relationship between the lower door 15 and the weight 25, the lower door 15 is connected to the second pulleys 23A and 23B.
In addition to the third pulleys 24A and 24B, which are movable pulleys.
The weight 25 will be supported via. In this case, since the moving distance of the lower door 15 is 2h, the moving distance of the weight 25 is h, which is half of 2h, based on the conditions of the movable pulley. Therefore, the weight 25 can be raised and lowered by a distance h to raise and lower the upper door 1 and the lower door 15. Further, the upper door 14 and the lower door 15 each have the same weight G. In relation to the upper door 14, the weight 25 requires the same weight G as the upper door 14 due to the condition of a fixed pulley. In addition, in relation to the lower door 15, a weight of 2G, which is twice the weight G of the lower door 15, is required due to the conditions of the movable pulley. Therefore, the weight W of the weight 25 is set to G+2G=3G, that is, three times the weight of each door, in order to raise and lower both doors 14 and 15 together and with the weight balanced. In this way, the upper door 14 and the lower door 15 are supported while maintaining their weight balance by one weight 25.

A case will now be described in which both doors 14 and 15 are raised to open the opening 12 of the draft chamber body 11. When both doors 14 and 15 close the opening 12, the upper door 1 is closed as shown in FIG.
4 is at the top of the opening 12, and the lower door 15 is at the top of the opening 12.
The weights are balanced with the weight 25 to maintain the lowered state and stop. Then, as shown in FIG. 6, when the operator pushes up the lower door 15 by applying force with his/her hand, the first
Then, the second ropes 33A, 33B move, and the weight 25 descends while being suspended from the ropes 33A, 33B via the third pulleys 24A, 24B for the lower door. When the weight 25 descends, the first and second ropes 32A and 32B for the upper door are pulled down and moved by the weight 25, so that the upper door 14 is moved by the rope 32.
It is pulled up by A and 32B and rises. When the lower door 15 is raised in this way, the upper door 14 is also raised together. In this case, the upper door 14 rises as the weight 25 descends, and there is no need to push the lower door 15 up by colliding with the upper door 14, so both doors 14 and 15 are moved together in the same way as a single door. It can be raised smoothly.
Further, the upper door 14 and the lower door 15 move upward smoothly without rattling at both left and right ends. Then, as shown in FIG.
During this time, the upper door 14 rises a distance h and enters the door storage section 16. The weight 25 descends within a distance h. This opens the opening 12 of the draft chamber body 11. Conversely, when the lower door 15 is lowered, the upper door 14 is also lowered together to close the opening 12. In this case, the weight 25
will rise.

Note that the present invention is not limited to the door of a draft chamber, but can be widely applied to devices that raise and lower the upper and lower doors.

[Effect of idea]

As explained above, the door opening/closing device of the present invention can smoothly raise and lower the upper and lower doors together, making it easy to open and close the two-panel door consisting of the upper and lower doors. The lower door can be raised and lowered using one common weight, and the number of weights can be minimized.

[Brief explanation of the drawing]

Figures 1 to 3 show a conventional door opening/closing device. Figure 1 is a schematic front view, Figures 2 and 3 are schematic side views, and Figures 4 to 12 are main views. This figure shows an example in which the invention is applied to a draft chamber. Figure 4 is a front view of the draft chamber, Figures 5 to 7 are cross-sectional views, and Figures 8 to 10 are cross-sectional views of the rope. FIG. 11 is a perspective view of the door, and FIG. 12 is an explanatory diagram showing the relationship between the door and the weight. DESCRIPTION OF SYMBOLS 11... Draft chamber main body, 12... Opening, 14... Upper door, 15... Lower door, 16... Door storage part, 20A, 20B... First pulley for upper door, 2
1A, 21B...Second pulley for upper door, 22A, 2
2B...First pulley for lower door, 23A, 23B...
Second pulley for lower door, 24A, 24B... Third pulley for lower door, 25... Weight, 32A, 32B... First and second rope for upper door, 33A, 33B...
...First and second ropes for the lower door.

Claims (1)

[Scope of utility model registration request] In a device for opening and closing an upper door and a lower door provided in an opening so as to be freely raised and lowered, a first pulley for the upper door and a first pulley for the lower door are respectively provided above one end side of the opening, A second pulley for the upper door and a second pulley for the lower door.
A third pulley for the lower door is provided on a weight disposed on the other end side of the opening so as to be movable up and down;
and a first rope for the upper door connected to one end of the upper door is passed between the first pulley for the upper door and the second pulley for the upper door and connected to the weight; A second rope for the upper door connected to the other end of the upper door is wound around the second pulley for the upper door and connected to the weight, and a first rope for the lower door connected to one end of the lower door is connected to the weight. A rope is stretched between the first pulley for the lower door, the second pulley for the lower door, and the third pulley for the lower door and fixed above the other end side of the opening, and A second rope for the lower door connected to the other end of the door is wrapped around the second pulley for the lower door and the third pulley for the lower door and fixed above the other end side of the opening. In the door opening/closing device, the weight has a weight three times the weight of each door.