JPH055945Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is intended to provide a side-open draft chamber having side and front observation doors.

[Prior Art] Conventionally, this type of device is as follows.

In most laboratories and schools, a fume hood chamber and a laboratory table are installed adjacent to each other, and for chemical experiments, etc., preparations are often made on the laboratory table, and then the experiment is carried out in the fume hood chamber.

In such a case, it is preferable that the working surfaces of the experimental bench and the draft chamber are continuous. Therefore, the heights of the working surfaces of the experimental bench and the draft chamber should be the same, and the sides of the draft chamber should be aligned. There is a side-opening type draft chamber that has a certain portion opened upwards from the height of the work surface, and has an observation door on the side that can be freely raised and lowered in the opening.

In this way, when the side observation door is raised, the work surface of the experiment table and the draft chamber are continuous, making the work of the experimenter easier.

Normally, in a draft chamber, the front observation door is supported at the left and right edges by concave guide rails provided in the vertical direction on the inside front part of both sides of the main body, and the left and right edges are supported by balance weights and wires of the same weight as the observation door. It is tied with a rope and can move up and down freely.

A support guide mechanism is essential because the inside of the draft chamber is under negative pressure during operation, and pressure is applied to the observation door from the outside.

Therefore, assuming that the front observation door is raised and lowered,
Instead of opening the sides completely, it is necessary to either support the front observation door by leaving a guide rail on a part of the front side as a pillar, or use a special front observation door support method. Become.

However, the former method is not preferable because the remaining pillars become an obstacle to the work.

FIG. 1 is a perspective view of the latter 11.

The disadvantages of this are shown in Figure 2.
Supported part 11A1 of the left frame of the front observation door 11A
protrudes upward for a long time.

This supports the upper part of the observation door at a sufficient distance in order to withstand the pressure when the front observation door is lowered and to keep the observation door vertically raised and lowered.
1 will stand out when rising.

[Problem to be solved by the invention] In the conventional technology, in order to prevent this protruding state from occurring, the height of the upper part B of the draft chamber should be made sufficiently high relative to the height A of the opening of the draft chamber. The total height of the draft chamber may be increased to ensure a sufficient supported portion 11A1, but in any case, the ceiling height of the room in which the draft chamber is installed must be sufficient.

The present invention overcomes the latter drawback, and the size of the opening and the size of its upper part are almost equal, and when the total height is low or the same total height so that nothing protrudes even when the observation door is raised, a larger opening is created. The purpose is to provide a side-open draft chamber that obtains the following characteristics.

[Means for Solving the Problems] In order to achieve the above object, the present invention is as follows.

In other words, the present invention is a side-open type draft chamber that has an opening on one or both of the front and side surfaces of the draft chamber main body, and the observation door moves up and down through the opening. Alternatively, it has a guide fixed to the upper part of both openings, a first stage slide part arranged perpendicularly to the guide so as to be able to rise and fall freely, and a cylindrical shape that can freely rise and fall with respect to the first stage slide part. This is a side-open draft chamber in which the second stage slide part is connected to the front observation door, the front observation door is indirectly supported via the first stage slide part, and is configured to be freely raised and lowered. .

[Effect] I will explain it along with the effects.

[Example of idea] Examples will be described with reference to the drawings.

FIG. 3 is a front view of a side-open draft chamber A with one left side open according to the present invention, FIG. 4 is a left side view, and FIG. 5 is a perspective view of essential parts from the left front.

In FIG. 5, the front panel 2 and side panel 3 are removed.
The slide column 5 is shown in its fully extended state.

1 is the side plate, 1A is the guide rail, 5A is the fixed guide, 5B is the first slide part, 5C is the second slide part, 7 is the back board, 7A is the guide rail on the back, 8 is the lower stand, 9 is the ceiling, 9A is exhaust duct, 1
0 is a falling wall.

The front observation door 4 and the left observation door 6 are connected by a wire rope (not shown) via a balance weight (not shown) of equal weight and a pulley (not shown).

Details of the guide rail 7A on the back side are omitted.

FIG. 6 is a perspective view of the structure of the slide column.

The fixed guide 5A is a bag-shaped pillar having a cross-sectional shape with the middle of one long side of a rectangle cut out, and is fixed vertically to the inner side of the front end of the descending wall 10.

The U-shaped partial guides 5A1 at both inner ends of this fixed guide serve as guides through which a sliding member 5B1 of the first stage slide section, which will be described later, can move in the vertical direction.

5A2 and 5A3 are stoppers that define the upper and lower limits of the first stage slide portion.

The first stage sliding part 5B is a member having an H-shaped cross section and having a length approximately equal to that of the fixed guide 5A. The first stage slide part 5B has a notch 5B3 to avoid interference with the fixed guide when descending, and similarly, the second stage slide part 5B has a notch 5B3 to avoid interference with the fixed guide when descending.
Since C also descends relative to the first slide section, a notch 5B4 is formed in the first slide section 5B to avoid interference with the second slide section.

Of the four pointed ends, two are fitted over the entire surface of the sliding tool 5B1 that fits into the guide 5A1 of the fixed guide and makes the slide smooth, and similarly, sliding tools 5B2 are attached to the other two pointed ends. , and fits into the guide 5C1 of the second stage sliding section to smoothly slide.

The second stage sliding part 5C is a cylindrical member with almost the same length as the fixed guide 5A, 5C1 is a guide into which the slider 5B2 is fitted, 5C2 is a part to which the front observation door is joined, and 5C3 is a part for side observation. The concave grooves 5C4 and 5C5 that serve as guides on the front edge side of the door are projections that contact the first slide section and cause it to move simultaneously when the second slide section moves by a predetermined amount or more.

In this way, the first-stage slide section is supported by the fixed guide for approximately half of its total length, and the second-stage slide section is similarly supported by the first-stage slide section, making it possible to obtain a stroke that is approximately equal to its entire length. Since there is a sufficient support distance, it is possible to sufficiently withstand negative pressure even when connected to the front observation door.

The side observation door of the present invention is supported only by a guide rail 7A provided on the back plate 7.

Since the second stage sliding portion moves together with the front observation door, the front edge of the side observation door is not supported when the front observation door is raised.

However, if the front observation door is raised, air flows into the draft chamber from the space created by its movement, so no pressure is applied to the side observation door.

Also, when both the front and side observation doors are lowered, pressure is naturally applied to the side observation door, but at this time, the second slide section is also lowered at the same time, so this groove 5C3 is used for side observation. The leading edge of the door can fit and withstand pressure.

In this example, the opening is on the left side, but it is of course possible to open on the right side or open on both sides using the technology of the present invention.

Further, the shapes of the fixed guide, the first slide portion, and the second slide portion are not limited to the above embodiments.

Further, the function of the sliding device may be replaced by other means such as rollers.

[Effects of the invention] Since the present invention is configured as described above, it produces the following effects.

According to the present invention, the overall height of the side-open draft chamber can be reduced, making it possible to install it even in laboratories with lower ceiling heights than conventional ones.

[Brief explanation of drawings]

FIG. 1 is a perspective view of the conventional device, FIG. 2 is a perspective view of the front observation door in the conventional device, FIG. 3 is a front view of the side-open draft chamber of the present invention, and FIG. 4 is a left side view. FIG. 5 is a perspective view of the main parts from the front left, and FIG. 6 is a perspective view of the structure of the slide column. A... Side open draft chamber, 1...
Side plate, 1A...Guide rail, 2...Front plate, 3
...Side plate, 4...Front observation door, 5...Slide column, 5A...Fixed guide, 5B...1st slide section, 5C...2nd slide section, 6...Left observation door , 7... Back plate, 7A... Guide rail, 8
...Lower stand, 9...Ceiling, 9A...Exhaust duct, 1
0... Falling wall.

Claims (1)

[Scope of utility model registration request] In a side-open type draft chamber that has an opening on one or both of the front and side surfaces of the draft chamber body, and the observation door moves up and down through the opening, It has a guide fixed at the top, a first stage slide part arranged perpendicularly to the guide so as to be vertically movable, and a cylindrical second stage slide part that can freely rise and fall with respect to the first stage slide part. A side-open draft chamber characterized in that the front observation door is connected to the front observation door, the front observation door is indirectly supported via a first stage slide part, and the side surface opening type draft chamber is capable of being freely raised and lowered.