JPH0477619B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a draft chamber that is provided with a two-stage elevating door in the open portion of the chamber body.

[Conventional technology]

Draft chambers used in research laboratories are used to carry out experiments in a laboratory built into the chamber body, and exhaust the gas generated by the experiments outdoors through the exhaust port. This opening is provided with a door for opening and closing. Since this door has good operability and space factor, it is often used that has an upper door and a lower door arranged at different levels in the front and back so that they can be raised and lowered.

Conventionally, the upper and lower doors provided in the open portion of the chamber body are supported by a mechanism using wires and weights so as to be able to rise and fall while maintaining weight balance. That is, wires for the upper and lower doors are each wrapped around pulleys and suspended on both sides of the open part of the chamber body, one end of each wire is connected to the upper end of both sides of each door, and each wire is A weight corresponding to the weight of the door is connected to the other end to support each door so that it can move up and down.

[Problem to be solved by the invention]

However, if the mechanism supports the upper and lower doors provided in the open part of the chamber body, two weights for the upper door and the lower door are raised and lowered on both sides of the open part in the chamber body. It is necessary to provide a passage for the passage, and a space for providing this passage is secured, which increases the size of the chamber body.

The present invention was made based on the above circumstances, and
To provide a draft chamber in which a mechanism for raising and lowering two upper and lower doors provided in an open part of a chamber body can be housed in a narrow space and the chamber body can be miniaturized.

[Means to solve the problem]

In order to achieve the above object, the draft chamber of the present invention has an open front part of the chamber main body, and an upper door and a lower door are disposed in the open part at different levels in the front and back so that they can be raised and lowered. , a mainspring spring is provided above the open part of the chamber body, the tip of the mainspring is pulled out downward and fixed to the lower door, and one end is fixed to the chamber main body above the open part of the chamber main body. A cable body is provided, and the cable body is lowered and supported from below and wrapped around a car provided on the upper door, and the other end of the cable body is fixed to the lower door. That is.

[Effect]

Based on this means, the following effects occur.
That is, the weight balance of the lower door and the upper door is maintained by the spring force of the mainspring, and by pushing up or pulling down the lower door, the mainspring spring and the cable body move, and both doors move up and down.

〔Example〕

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

Figures 2 through 4 show the entire draft chamber. In the figure, reference numeral 1 denotes a chamber body, and an open part 3 is formed in the front part of a laboratory chamber 2 provided inside the chamber body. Further, the chamber main body 1 is provided with an exhaust passage 4 and an exhaust port 5 for discharging the gas that was generated during the experiment conducted in the laboratory 2.
The gas is discharged outdoors through an exhaust duct (not shown) connected to the In addition, an air supply port 6 connected to an air supply duct (not shown) for supplying air to the laboratory 2, an external air supply section 7 and an internal air supply section 8 communicating with the air supply port 6, and an air supply port A damper 9 is provided for switching and selecting communication between the air supply section 6 and the air supply sections 7 and 8.

A door provided in the open portion 3 of the chamber body 1 and a mechanism for supporting the door so as to be movable up and down will be explained. As shown in FIGS. 1, 5 to 7, guide frames 1 are attached to the edges of both sides of the opening 3.
0 and 10 are provided vertically, and in the open part 3, a lower door 11 and an upper door 12 are vertically arranged in a stepped manner in the front and back, and are supported by guide frames 10, 10 so as to be movable up and down. In addition, a fixed window 1 is provided above the upper door 12.
3 is provided.

The lower door 11 and the upper door 12 are made of glass plates, as shown in FIGS.
is installed. Rollers 15, 15 are protruded from the respective frames 14, 14 of each door 11, 12, and these rollers 15, 15 are installed along the vertical direction on guide frames 10, 10 provided on both sides of the open portion 2, respectively. It is fitted in the formed guide grooves 16, 16 so as to be able to roll freely. Thereby, both sides of the lower doors 11 and 12 are held by the guide frames 10, 10 so as to be able to rise and fall freely. Note that there is a handle 1 on the lower edge of the lower door 10.
7 is installed.

As shown in FIGS. 1, 5, 8, 10, 12 and 13, balancer cases 18, 18 are provided directly above each guide frame 10, 10 in the chamber body 1. There are mainspring springs 19, 19, 19, 19 provided therein as weight balancers (hoisting devices), respectively. These mainspring springs 19, 19, 19, 19 are wound around reels 20, 20, 20, 20 which are rotatably supported on balancer cases 18, 18, and one end of the spring is attached to the reel 20, 20, 20, 20. The other end is vertically pulled out from the lower surface of the balancer cases 18, 18 to open the lower door 1.
Stay 2 attached to the upper end of both side frames 14, 14 of 1
1 and 21 with screws 28 and 28. In this case, the other ends of the mainspring springs 19, 19 are overlapped for each balancer case 18, 18, and the stay 2
Connect to 1 and 21. These mainspring springs 19,
19, 19, 19 have a hoisting force equivalent to the total weight of the lower door 11 and the upper door 12, and the lower door 1
When 1 is pushed up, the reel 20, 20, 20, 20 can be rotated to easily wind it up. In this way, the lower door 11 is suspended and supported by the mainspring springs 19, 19 so as to be able to rise and fall freely.

As shown in FIGS. 1, 9 to 11, chains 22, 22 for suspending and supporting the upper door 12 are provided inside each guide frame 10, 10 in the vertical direction. One end is a stay 2 attached to the upper end of the guide frame 10, 10.
3 and 23, and the other end is connected and fixed to stays 21 and 21 provided on both sides of the lower door 11.
In the upper door 12, stays 29, 29 are attached to the lower ends of the frames 14, 14 on both sides.
Sprocket wheels 24, 24 are rotatably provided. The chains 22, 22 are sprocket wheels 2 provided on both sides of the upper door 12.
4 and 24 from below and are engaged with each other. The combination of chains 22, 22 and sprocket wheels 24, 24 constitutes a movable pulley. In this way, the upper door 12 connects the chains 22, 2
2, it is suspended and supported so that it can be raised and lowered.

The balancer cases 18, 18 are provided at both ends of the damper 9 for switching the air supply passage, and the mainspring springs 1 stored in the balancer cases 18, 18
The damper 9 is driven in relation to the degree of hoisting of the lower door 11, ie, the degree of elevation of the lower door 11. FIG. 12 and FIG. 13 show the configuration. In other words, 25 is the mainspring 19,
A gear attached to the reel 20, 20 wound with 19, a gear rotated by meshing with the gear 25 of 26,
27 is a link operated by this gear 26 to drive the damper shaft 9a of the damper 9.

In the draft chamber configured in this manner, a lower door 1 for opening and closing the opening portion 2 of the chamber body 1 is provided.
1 and the operation of the upper door 12 are shown in FIGS.
This will be explained with reference to the figures.

First, when the opening part 2 of the chamber body 1 is closed, the lower door 11 and the upper door 12 are at their maximum lowered positions, as shown in FIGS. 1 and 14.

Then, as shown in Fig. 15, the operator
7 to push up the lower door 11, the mainspring springs 19, 19 move the reel 2 with their own spring force.
It is wound up with a length corresponding to the amount of rise of the lower door 11 while rotating at 0 and 20 degrees. Also, as the lower door 11 rises, the chains 22, 2 connected to the lower door 11
2 ends, the chains 22, 22 are pulled upwards and the sprocket wheels 24, 22 are pulled up.
The upper door 12 is raised via 24. Incidentally, as the chains 22, 22 move, the sprocket wheels 24, 24 provided on the upper door 12 rotate, so that the upper door 12 can be raised smoothly. In this way, the lower door 11 and the upper door 12 are suspended and supported by the mainspring springs 19, 19 and the chains 22, 22, and the weight balance is maintained by the mainspring springs 19, 19, so that they can be easily raised.

Further, as shown in FIG. 16, when the lower door 11 is raised to the uppermost position of the open portion 2, the upper door 12 is also raised to the uppermost position. In this case, if the moving distance for the lower door 11 is 1, then the moving distance for the upper door 12 is 0.5. In this way, the opening portion 2 of the chamber body 1 is opened.

In addition, when closing the opening part 2 of the chamber body 1, the operation described above is reversed.

Therefore, in the draft chamber of this embodiment, an upper door 11 and a lower door 12 for opening and closing the opening section 2 are provided.
Spring springs 19, 19 and chain 22,
22, and the weight balance of both doors 11, 12 is borne by the spring force of mainspring springs 19, 19. Therefore, the guide frames 10, 10 that slidably hold the upper door 11 and the lower door 12,
It is sufficient to form a space large enough to allow the mainspring spring 19 and chain 22 to pass through. This guide frame 1
The size of the space 0 and 10 is similar to the size of the space necessary to fit the side portions of the lower door 11 and the upper door 12 side by side. On the other hand, if a weight is used to maintain the weight balance of the door,
The guide frame is approximately twice the size of the guide frame 10 of this embodiment in order to secure both a part for passing the wire that suspends and supports the door and a part for lifting and lowering the weight as a guide frame. In other words, the size of the guide frame 10 of this embodiment is approximately 1/2 or less of the conventional size.

In this embodiment, a chain and a sprocket are used as the cables for suspending and supporting the upper door, but the present invention is not limited to the embodiment, and wires and pulleys may also be used.

〔Effect of the invention〕

As explained above, according to the draft chamber of the present invention, the weight balance of the lower door and the upper door, which open and close the opening of the chamber main body, is not based on a weight, but uses a spiral spring, so that the door can be raised and lowered. The space occupied by the mechanism is small, and the chamber body is significantly smaller than when a weight is used.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention; FIG. 1 is a perspective view showing the door of the draft chamber and its lifting/lowering mechanism, FIG. 2 is a front view showing the draft chamber, and FIG. 3 is a side sectional view of the same. Figure 4 is a sectional view of the same plane, Figure 5 is a front view showing the door and lifting mechanism, Figure 6 is a side view of the same, Figure 7 is a plan view of the same, Figures 8 and 9.
The figure is a front view showing the lifting mechanism, Figure 10 is a side view of the same, Figure 11 is a plan view of the same, Figures 12 and 13.
The figure is an enlarged view of the mainspring part.
4 to 16 are diagrams showing the operation of the door. 1... Chamber body, 2... Opening part, 10...
Guide frame, 11...lower door, 12...upper door,
19...Spring spring, 22...Chain, 24
...Sprocket wheel.

Claims (1)

[Claims] 1. In a draft chamber in which the front part of the chamber body is open and the upper door and the lower door are arranged at different levels in the front and back in this open part and can be raised and lowered, a mainspring spring is provided above the open part of the chamber body. , the tip of the mainspring spring is pulled out downward and fixed to the lower door, and a cable body with one end fixed to the chamber body is provided above the open part of the chamber body, and this cable body is pulled downward. It is lowered and wrapped around the car installed on the upper door while supporting it from below,
A draft chamber characterized in that the other end of the cable condition is fixed to the lower door.