JP4620392B2 - Tabletop hood - Google Patents

Description

  The present invention relates to a table hood such as a laboratory hood that is used by being installed on a laboratory table in a laboratory or laboratory.

  As shown in Patent Document 1, a laboratory hood such as a fume hood or a draft chamber is provided on the experimental table so that toxic gas generated by the experiment does not diffuse into the room when a chemical experiment is performed on the experimental table. Are well known. Such a hood for a laboratory bench has an opening on the front surface, and a transparent elevator door is provided in the front opening so as to be movable up and down. And when performing a desk work, a raising / lowering door is raised and a front opening is open | released.

On the other hand, among the hoods for laboratory benches, for example, those having a large frontage (width) size include a left-right split type in which two or more elevator doors are attached in parallel to the front opening along the frontage direction. For example, in a laboratory hood where two elevator doors are provided in parallel in the frontage direction, an intermediate column is provided in the middle of the front opening, and the opposite side edge (inner edge) of the adjacent elevator door is the intermediate column. The outer edge is supported so as to be slidable along the two columns. The front opening is opened and closed by sliding each elevating door along each column.
Japanese Patent Laid-Open No. 10-43612 (FIG. 1-5)

  However, in the desktop hood with a split left and right door structure, an intermediate column is provided in the middle of the front opening, so when all the elevator doors are opened, the intermediate column is divided so that the front opening is divided into left and right. Be placed. The front end of the front opening is blocked in the middle by this intermediate strut, and it is not possible to perform desk work using the entire front opening direction.For example, equipment entry / exit work and experiment operation on the desk are restricted, and work There was a problem that efficiency decreased.

  An object of the present invention is to provide a tabletop hood that solves the above-described problems of the prior art, can perform desk work using the entire front opening direction, and can improve work efficiency. .

  In order to achieve the above object, the gist of the present invention is as follows.

[1] A plurality of elevating doors are arranged in parallel along the frontage direction at the front opening of the hood body installed on a work table such as a test bench, and the opposite side edges of the elevating doors adjacent to the frontage direction are A tabletop hood that is supported by an intermediate support mechanism so as to be vertically slidable, and that the front opening is opened and closed by raising and lowering the elevating door,
The intermediate support mechanism is
A fixing member provided on the upper side of the hood main body corresponding to the opposite side edge of the lift door;
It is supported by the fixing member so as to be vertically slidable in a state of being arranged along the vertical direction, and when it is slid downward, it moves into the front opening, and when it is slid upward, it is retractable from the front opening. Rails, and
A desk hood, wherein the opposite side edge of the elevating door is supported by the movable rail, and the movable rail is advanced / retracted with respect to the front opening as the elevating door is raised / lowered.

[2] The plurality of elevator doors arranged in parallel have first and second elevator doors, respectively.
The movable rail has first and second movable rails corresponding to the first and second lifting doors, respectively.
The opposing side edge of the first lifting door is fixed to the first movable rail, and the opposing side edge of the second lifting door is slidably supported along the vertical direction with respect to the second movable rail,
The first movable rail is slid upward with respect to the fixed member, the second movable rail is slid upward with respect to the fixed member, and the second lift door is moved upward with respect to the second movable rail. In the slid state, the first and second lifting doors are arranged to overlap in the front-rear direction in the upper part of the hood body,
The first movable rail is slid downward relative to the fixed member, the second movable rail is slid downward relative to the fixed member, and the second lift door is further downward relative to the second movable rail. The tabletop hood according to the preceding item 1, wherein the first and second elevating doors are arranged side by side so as to close the front opening when slid.

[3] A rotary shaft extending along the frontage direction is provided at a position above the lift door in the upper portion of the hood main body so as to be rotatable about its axis.
A door pulley is fixed to both ends of the rotating shaft, and a weight pulley is fixed to one end,
The upper and lower ends of the elevating door are respectively suspended by the wire wound on the door pulley, and the balance weight is suspended by the wire wound on the weight pulley,
3. The tabletop hood according to claim 1 or 2, wherein the lift door is configured to be held at a desired slide position by being balanced in weight between the lift door and the balance weight.

  [4] The support according to [3], wherein support columns are provided on both sides of the front surface of the hood main body, a hollow portion extending in the vertical direction is provided in the support column, and the balance weight is accommodated in the hollow portion so as to be movable up and down. Tabletop hood.

  [5] The tabletop hood according to item 3 or 4, wherein the balance weight is suspended from the weight pulley by a plurality of wires.

[6] A vent is provided in the upper side of the hood body,
6. The structure according to claim 1, wherein the vent is closed by the elevator door when the elevator door is raised, and the vent is opened when the elevator door is lowered. Tabletop food according to any of the above.

[7] The fixing member of the intermediate support mechanism includes a substrate fixed to the upper portion of the hood body, and a fixing rail fixed to the substrate in a state of being arranged along the vertical direction.
7. The tabletop hood according to any one of the preceding items 1 to 6, wherein the movable rail is supported so as to be slidable in the same direction in a state in which the length direction coincides with the fixed rail.

  According to the table hood of the invention [1], the opposite side edges of the elevator doors adjacent to each other in the frontage direction are supported by movable rails that can be moved forward / backward with respect to the front opening, and the front opening is opened by raising the elevator door. Because the movable rail is retracted from the front opening when the front opening is opened, there is no door support member such as a column in the middle when the front opening is opened, and the front opening is not interrupted in the middle. It is possible to perform the work on the desk while using the whole area in the frontage direction, and the work efficiency can be improved.

  According to the desktop hood of the invention [2], an upper and lower divided door structure in which two elevator doors are arranged in each row is adopted. That is, when the opening is closed, the elevator doors can be arranged up and down to sufficiently secure the closed area by the door, and the front opening can be formed correspondingly to improve the working efficiency. Further, when the door is opened, the two elevator doors are arranged so as to overlap each other in the upper part of the hood main body, and the occupied space (storage space) in the vertical direction of the elevator door can be reduced, so that the size can be reduced.

  According to the table hood of the invention [3], since the balance weight is provided only on one side of the lifting door, the number of balance weights can be reduced compared to the case where the balance weight is provided on both sides of the lifting door. In addition, the structure can be simplified, the assembly workability can be improved, and the cost can be reduced more reliably. And since the door pulley provided corresponding to the both sides of a raising / lowering door is connected with the rotating shaft, the door pulley of both sides can be rotated synchronously. Therefore, even if the balance weight is arranged only on one side, the hoisting / lowering operation can be performed with good balance between the door pulleys on both sides, and good operability can be maintained in the elevating door.

  According to the tabletop hood of the invention [4], since the balance weight is disposed in the support column of the hood body, it is not necessary to separately provide a balance weight installation place, and the balance weight structure is visually recognized from the outside. Therefore, a good appearance can be obtained and the aesthetic appearance can be improved.

  According to the desktop hood of the invention [5], since the balance weight is suspended by a plurality of wires, even if any wire is cut by any chance, the balance weight is removed by the remaining wires. It can be reliably suspended, and the balance weight can be prevented from falling, and hence the elevator door can be prevented from being inadvertently lowered.

  According to the tabletop hood of the invention [6], when the elevator door is lowered and the front opening is closed, an appropriate amount of outside air flows into the hood through the vent. Therefore, it is possible to prevent generation of unpleasant noise such as suction sound due to excessive negative pressure. Further, when the elevator door is raised and the front opening is opened, the vent is blocked, so that a large amount of outside air can be prevented from flowing into the hood, and the inside of the hood can be maintained at an appropriate negative pressure. For example, the outflow of toxic gas due to lack of negative pressure can be reliably prevented.

  According to the tabletop hood of the invention [7], the fixed rail is fixed to the hood main body via the substrate, and the movable rail is slidably supported on the fixed rail, so that the sliding operation of the movable rail is stabilized. As a result, the opening / closing operation of the elevating door can be performed smoothly.

  FIG. 1 is a perspective view showing a hooded experimental table to which a laboratory hood according to an embodiment of the present invention is applied. As shown in the figure, this hood for a laboratory bench (1) has a left and right divided door structure in which elevator doors (51) (52) are arranged in two rows in the frontage direction (width direction) on the front side and rear side. And the hood main body (2) installed on the experimental stand main body (10) is provided.

  The outer wall and inner wall of the hood body (2) are made of a thermosetting resin (phenolic resin) having excellent chemical resistance.

  The hood body (2) is provided with openings (21) and (21) on the front side and the rear side thereof, and is also provided with openings (22) and (22) on both sides. A curtain plate (25) is provided on the upper side of the front and rear opening (21) in the hood body (2), and the inside and outside of the hood body (2) are communicated with both sides of the curtain plate (25). A vent (26) is provided. The ceiling wall of the hood main body (2) is provided with a discharge port (27), and air in the hood main body (2) is provided by an exhaust means (not shown) such as an exhaust duct connected to the discharge port (27). Is exhausted and the inside of the hood is set to a negative pressure with respect to the outside air.

  Each side opening (22) of the hood body (2) is provided with a transparent side opening / closing door (23) slidable in the front-rear direction. By sliding the side opening / closing door (23) as appropriate, It is comprised so that both-side opening (22) can be opened and closed.

  Since the front hood and the rear hood of the experimental bench hood (1) of the present embodiment have substantially the same configuration, in the following description, the front side will be described as an example. .

  As shown in FIG. 2, both side walls of the hood main body (2) have an inner panel (31) and an outer panel (32) that are arranged in parallel at a distance. A front end panel (33) is provided between the panels (31) and (32) so as to close the front end thereof, and a partition panel (34) is provided rearwardly from the front end panel (33). ing. And the support | pillar (3) is formed of these four panels (31)-(34). A hollow portion (30) extending in the vertical direction is formed inside the support column (3).

  A U-shaped groove member (4) continuous in the vertical direction is fixed to the inner panel (31) of the support column (3), and the U-shaped groove of the groove member (4) has a long length. Two front and rear first and second rail grooves (41) and (42) are provided along the vertical direction.

  As shown in FIGS. 3 to 7, the upper middle portion of the hood body (2) supports opposing side edges (inner edges) of the elevator doors (51) and (52) adjacent in the width direction (frontage direction). An intermediate support mechanism (6) is provided.

  The intermediate support mechanism (6) includes a steel plate substrate (60) having a hat shape in cross section having a predetermined length. The upper end of the substrate (60) is fixed to a beam member (28) made of a square pipe steel plate provided on the upper front portion of the hood body (2) via a bracket (65), whereby a curtain plate (25 ) Along the vertical direction on the back side.

  The first fixed rails (611) and (611) are respectively fixed along the vertical direction on the front sides of both flanges of the substrate (60), and two pieces are provided along the vertical direction on the front side of the web. The second fixed rails (612) (612) are fixed in a parallel arrangement.

  The first and second fixed rails (611) and (612) have the first and second movable rails (621) and (622) in the same direction through the balls (66) with their length directions aligned. It is slidably supported.

  Note that locking means (not shown) for locking to the upper end portions of the movable rails (621) and 622 is provided at the lower end portions of the fixed rails (611) and (612), and the movable rails (621) and (622) are provided. ) Moves downward, the movable rails (621) and (622) are configured not to be pulled out (dropped) downward from the fixed rails (611) and (612) by the locking of the locking means.

  On the front side of each movable rail (621) (622), a door support member (631) (632) having a U-shaped cross section is fixed with the opening facing outward.

  Here, in this embodiment, a fixing member is comprised by a board | substrate (60) and a fixed rail (611) (612).

  On the other hand, the elevator doors (51) (52) arranged in two rows in the frontage direction are the first elevator door (51) arranged on the upper side when the opening is closed and the second elevator door (52) arranged on the lower side. ). Each door (51) (52) is a transparent plate (50) made of a rectangular plate glass, and an inner edge fixing frame fixed along side edges (inner edges) facing each other in an elevator door adjacent in the frontage direction. (51a) (52a) and outer edge fixing frames (51b) (52b) fixed along the outer edge as shown in FIG.

  And as shown in FIG.3 and FIG.4, the inner edge fixed frame (51a) (51a) of a 1st raising / lowering door (51) (51) is the 1st movable rail (621) (621) in the said intermediate support mechanism (6). ) Of the door support members (631) and (631). Furthermore, the inner edge fixing frames (52a) (52a) of the second elevating doors (52) (52) are fitted into the door support members (632) (632) of the second movable rails (622) (622), and the length is long. It is slidably supported in the vertical direction (vertical direction).

  Further, as shown in FIG. 2, the outer edge fixing frames (51a) (51a) of the first elevating doors (51) (51) are the first rail grooves in the both side supports (3) (3) of the hood body (2). (41) It is accommodated in (41) so as to be slidable in the vertical direction. Further, the outer edge fixing frames (52b) (52b) of the second elevating doors (52) (52) are slidable in the vertical direction in the second rail grooves (42) (42) of the both side columns (3) (3). Be contained.

  Thus, as shown in FIGS. 7 and 10, when the first elevating door (51) slides downward with respect to the first fixed rail (611) together with the first movable rail (621), the first elevating door (51) is disposed on the upper side of the front opening (21) together with the first movable rail (621). In this state, when the second elevating door (52) slides downward with respect to the second movable rail (622), and when the second movable rail (622) slides downward with respect to the second fixed rail (612). The second elevating door (52) is disposed in the lower region of the first elevating door (51), that is, in the lower part of the front opening (21), and the first and second elevating doors (51) (52). As a result, the front opening (21) is closed. At the time of closing, the movable rails (621) and (622) are moved downward together with the elevating doors (51) and (52) and are disposed in the front opening (21).

  As shown in FIGS. 5 and 8, when the first elevating door (51) slides upward with respect to the first fixed rail (611) together with the first movable rail (621), the first elevating door (51 ) Are arranged on the back side of the curtain plate (25) together with the first movable rail (621). In this state, when the second elevating door (52) slides upward with respect to the second movable rail (622), and further when the second movable rail (622) slides upward with respect to the second fixed rail (612). The second elevating door (52) is arranged on the back side of the curtain plate (25) so as to overlap the front side of the first elevating door (51). At the time of opening, the movable rails (621) and (622) are disposed on the back side of the curtain plate (25) together with the elevating doors (51) and (52) and retract from the front opening (21).

  As described above, the movable rails (621) and (622) are configured to advance / retreat with respect to the front opening (21) as the elevating doors (51) and (52) are moved up and down.

  In addition, as shown in FIG. 5, in the state which raised the 1st and 2nd raising / lowering door (51) (52) and has arrange | positioned on the back surface side of the curtain plate (25), the 1st and 2nd raising / lowering door (51). (52) closes the vent (26) of the curtain plate (25), and when the first and second elevating doors (51) and (52) are lowered as shown in FIG. The vent (26) of the plate (25) is opened so that the inside and outside of the hood communicate with each other through the vent (26).

  On the other hand, as shown in FIGS. 11 to 13, on the upper portion of the hood body (2), two rotating shafts (in the frontage direction) corresponding to the upper portions of the elevator doors (51) and (52) in each row ( 7) (7) is provided. Both the rotating shafts (7) and (7) are rotatably attached to the hood body (2) around the respective axis centers via a plurality of brackets (75) in a state of being arranged on the same axis.

  The inner multi-stage pulley (7a) is fixed to the end portion (inner end) on the intermediate support mechanism (6) side of both rotating shafts (7), and the end portion (outer end) on the support column (3) side is fixed. The outer multi-stage pulleys (7b) are respectively fixed.

  As shown in FIG. 3, the inner multi-stage pulleys (7a) (7a) are the first and second pulleys corresponding to the inner edge fixing frames (51a) (52a) of the first and second elevating doors (51) (52). (71a) (72a) is formed in combination, and both pulleys (71a) (72a) are configured to rotate integrally.

  Furthermore, the wire (75a) (75a) is provided in the 1st and 2nd pulley (71a) (72a) so that winding is possible, and the 1st and 2nd lifting door ( The upper end portions of the inner edge fixing frames (51a) and (52a) in 51 and 52 are suspended.

  As shown in FIGS. 14 to 16, the outer multi-stage pulleys (7 b) (7 b) are first and second corresponding to the outer edge fixing frames (51 b) (52 b) of the first and second elevating doors (51) (52). The second pulley (71b) (72b) and the third and fourth pulleys (73b) (74b) corresponding to the balance weight (8) described later are combined to form these pulleys (71b) (72b). (73b) and (74b) are configured to rotate together.

  Furthermore, the wire (75b) (75b) is provided in the 1st and 2nd pulley (71b) (72b) so that winding is possible, and the 1st and 2nd lifting door ( 51) The upper end part of the outer edge fixing frame (51b) (52b) in (52) is suspended.

  Here, the first pulleys (71a) (71b) of the inner multi-stage pulley (7a) and the outer multi-stage pulley (7b) are formed to have the same size, and the second pulleys (72a) (72b) are The same size is formed. Further, the first pulleys (71a) and (71b) are set to have a diameter of one half that of the second pulleys (72a) and (72b), and the winding and unwinding amount during rotation is the second. The pulleys (72a) and (72b) are adjusted to be half. Thereby, at the time of the door raising / lowering mentioned later, the 1st raising / lowering door (51) is comprised so that it may raise / lower at a speed of 1/2 with respect to the raising / lowering speed of the 2nd raising / lowering door (52).

  As shown in FIGS. 14 to 16, the balance weight (8) is suspended by a wire (76b) wound around the third pulley (73b) of the outer multi-stage pulley (7b). This balance weight (8) is arrange | positioned in the hollow part (30) of a support | pillar (3), and is comprised so that the inside of a support | pillar (3) may be raised / lowered by winding and unwinding of a pulley (73b).

  The weight of the balance weight (8) is configured to act in the opposite direction to the rotational direction in which the weight of the lift doors (51) and (52) acts, and the balance weight (8) and the lift door (51) ( 52) are balanced in terms of weight. Thereby, it is comprised so that a raising / lowering door (51) (52) may be hold | maintained in a desired raising / lowering position.

  Here, as shown in FIG. 16, the fourth pulley (74b) of the outer multi-stage pulley (7b) is provided with an auxiliary wire (77b), and this auxiliary wire (77b) is low in the balance weight (8). Connected with tension. As a result, even if the main wire (76b) is cut, the balance weight (8) is suspended by the auxiliary wire (77b). ) (52) can be prevented from being inadvertently lowered.

  Moreover, in this embodiment, when the main wire (76b) is cut by suspending the auxiliary wire (77b) at a position that is eccentric with respect to the balance weight (8), the balance weight (8) is tilted. Since it contacts the inner surface of (3), it can also be comprised so that it can grasp | ascertain easily from the exterior that the main wire (76b) was cut | disconnected.

  In the above description, the configuration on the front surface side in the experimental bench hood (1) of the present embodiment has been mainly described. However, as described above, in the hood (1) of the present embodiment, the configuration on the rear surface side. Is substantially the same as the configuration on the front surface side.

  In the laboratory bench hood (1) having the above configuration, when the front opening (21) is closed from the opened state as shown in FIGS. 8 and 11, the second lifting door (52) is held by hand. I will let you go down. As a result, as shown in FIGS. 9 and 12, the multi-stage pulleys (7a) and (7b) rotate in a direction to lower the elevating doors (51) and (52) as the second elevating door (52) is lowered. At this time, as described above, the first pulley (71a) corresponding to the first lifting door (51) with respect to the unwinding amount of the second pulley (72a) (72b) corresponding to the second lifting door (52). Since the unwinding amount of (71b) is adjusted to one half, the first lifting / lowering door (51) is lowered by its own weight at half the lowering speed than the lowering speed of the second lifting / lowering door (52). Go.

  Subsequently, the second movable rail (622) in the intermediate support mechanism (6) slides to the lower end of the second fixed rail (612) by the lowering of the lift doors (51) (52), and the second fixed rail (612). After the second movable rail (622) is prevented from descending, the second elevating door (52) slides downward with respect to the second movable rail (622). Even during this lowering, the first elevating door (51) is lowered with respect to the first fixed rail (611) together with the first movable rail (621), and the first elevating door (51) is the second elevating door ( 52) and descend at half the speed.

  Thus, as shown in FIGS. 10 and 13, when the second elevating door (52) is lowered to the lowest end, the upper half area of the front opening (21) is closed by the first elevating door (51). The remaining half of the area is closed by the second lift door (52), and the front opening (21) is fully closed.

  In the present embodiment, it is also possible to adopt a configuration in which an open region remains in the lower portion of the front opening (21) in a state in which it is fully closed by the elevating doors (51) and (52).

  On the other hand, when opening the front opening (21) from the closed state, the second elevating door (52) is lifted. As a result, the second elevating door (52) rises with respect to the second movable rail (622), and the multi-stage pulleys (7a) and (7b) wind up the elevating doors (51) and (52) with this rise. Rotate in the direction. Thus, the first elevating door (51) is wound up via the wires (75a) and (75b), and ascends at a half speed relative to the second elevating door (52).

  Subsequently, after the second elevating door (52) rises to the upper end of the second movable rail (622) due to the raising of the elevating door (51) (52), the second elevating door (52) is moved to the second movable rail. (622) and slides upward relative to the second fixed rail (612). Even during this ascent, the first elevating door (51) rises with respect to the first fixed rail (611) together with the first movable rail (621), and the first elevating door (51) becomes the second elevating door ( It rises at half the speed of 52).

  As shown in FIGS. 8 and 11, when the second lift door (52) is raised to the uppermost end, the second lift door (52) is moved to the first lift door (52) on the back side of the curtain plate (25). 51), the front opening (21) is fully opened.

  In this fully opened state, the first and second movable rails (621) and (622) are disposed on the back side of the curtain plate (25) together with the first and second elevating doors (51) and (52). Retracted from the opening (21). Therefore, it is possible to perform desk work such as loading / unloading of equipment and experimental operation using the entire area of the front opening (21).

  In the present embodiment, as described above, the first and second elevating doors (51) and (52) and the balance weight (8) are balanced in terms of weight. The doors (51) and (52) can be held at a desired lifted position, for example, can be held in a half-opened state, and it is possible to perform desktop work in that state.

  As described above, according to the laboratory bench hood (1) of the present embodiment, when the elevator doors (51) and (52) are raised to open the front opening (21), the middle of the front opening (21). There is no door support member such as a column in the part, and the work on the desk can be performed using the whole area of the front opening (21) in the frontage direction, and the work efficiency can be improved.

  In the state where the front opening (21) is closed, the elevator doors (51) (52) are supported in a stable state with sufficient strength by the movable rails (621) (622) and the door support members (631) (632). can do.

  Moreover, in this embodiment, since it employs an upper and lower divided door structure in which two elevator doors (51) (52) are arranged in each row, the elevator doors (51) ( 52) can be arranged up and down to sufficiently secure the closed area by the door, and the front opening (21) can be formed correspondingly, and the working efficiency can be further improved. Further, when the doors are opened, two vertical doors (51) and (52) are arranged so as to overlap each other on the back side of the curtain plate, so that the vertical space (storage space) in the vertical doors (51) and (52) can be reduced. Therefore, downsizing can be achieved.

  In addition, it is possible to reliably prevent a problem that the upper part of the door protrudes from above the hood when fully opened. That is, in an upper and lower single door structure in which the front opening is opened and closed by a single lifting door, the vertical dimensions of the lifting door and the front opening are substantially equal. For this reason, if the elevator door is to be securely stored in the upper part of the hood in the fully opened state, the vertical dimension of the upper part of the hood needs to be made larger than the vertical dimension of the front opening. Therefore, it is not preferable to actually adopt such a configuration. Therefore, normally, in the upper and lower single door structure, the upper and lower dimensions of the upper part of the hood are set smaller than the upper and lower dimensions of the front opening, and the upper part of the elevator door protrudes above the hood when fully opened. Adopted.

  On the other hand, in this embodiment, since the upper and lower split type door structure is adopted, the two elevator doors (51) and (52) are overlapped with each other in the fully opened state, so that the elevator doors (51) and (52) are overlapped. Since the vertical occupying space can be reduced, it can be securely stored in the upper portion of the hood, and the problem that the elevating doors (51) and (52) protrude from above the hood can be reliably prevented.

  Further, in this embodiment, the balance weight (8) is provided only on one side of each row of the lift doors (51) and (52). Thus, the number of balance weights (8) can be reduced, and the structure can be simplified, the assembly workability can be improved, and the cost can be reduced more reliably. Moreover, since the inner and outer multi-stage pulleys (7a) and (7b) provided corresponding to both ends of the elevating doors (51) and (52) are connected by the rotating shaft (7), both the multi-stage pulleys (7a) and (7b) are connected. ) Can be rotated synchronously. Therefore, even if the balance weight (8) is arranged only on one side, it is possible to perform the hoisting and lowering operation between the multi-stage pulleys (7a) and (7b) in a timely manner, and the elevating operation of the elevating doors (51) and (52). Can be done smoothly.

  Furthermore, in this embodiment, since the balance weight (8) is disposed inside the support (3) of the hood body (2), there is no need to separately provide a balance weight installation place and the balance weight is externally provided. Since the structure is not visually recognized, a good appearance can be obtained and the aesthetic appearance can be improved.

  Moreover, in this embodiment, since the balance weight (8) is suspended by the two wires of the main wire (76b) and the auxiliary wire (77b), the main wire (76b) is cut by any chance. Even if it is closed, the balance weight (8) can be reliably suspended by the auxiliary wire (77b), and the balance weight (8) can be dropped and eventually the elevator doors (51) (52) can be lowered inadvertently. Can be prevented.

  In the present embodiment, the vent (26) is provided above the front opening (21) of the hood body (2), and the elevating doors (51) (52) are raised to open the front opening (21). When the elevator doors (51) and (52) close the vent hole (26) and the elevator doors (51) and (52) are lowered to close the front opening (21), the vent hole ( 26) is opened, an appropriate amount of outside air flows into the hood through the vent (26) when the front opening (21) is fully closed. For this reason, it can prevent that the inside of a food | hood becomes a negative pressure too much in a fully closed state, for example, generation | occurrence | production of the unpleasant noises, such as a suction sound resulting from an excessive negative pressure, can be prevented. Further, when the front opening (21) is fully opened, the vent (26) is closed, so that a large amount of outside air can be prevented from flowing into the hood, and the inside of the hood can be maintained at an appropriate negative pressure. For example, leakage of toxic gas due to lack of negative pressure can be reliably prevented.

  In the above embodiment, the case where the present invention is applied to a tabletop hood in which two elevator doors are arranged in the frontage direction has been described as an example. However, the present invention is not limited thereto, and the present invention is not limited to this. Can also be applied to a tabletop hood in which three or more are arranged.

  Further, in the above-described embodiment, the case where the present invention is applied to an upper and lower split door structure in which two elevator doors are arranged in the vertical direction has been described as an example. The present invention can also be applied to a tabletop hood having a top and bottom single door type structure in which one directional elevator door is arranged one by one.

  In the above-described embodiment, the tabletop hood provided with openings on the front and rear surfaces is described as an example. However, the present invention is not limited thereto, and the present invention can be applied to a tabletop hood provided with an opening only on the front surface. it can.

  The tabletop hood of the present invention can be used as a laboratory, a laboratory draft chamber installed on a laboratory bench, a fume hood, or the like.

It is a perspective view which shows the food for test benches which is embodiment of this invention. FIG. 2 is a plan cross-sectional view of the periphery of the hood on one side of the hood, corresponding to a cross section taken along line XX of FIG. 1. It is a perspective view which shows the intermediate support mechanism periphery of the said hood. It is a top sectional view showing the intermediate support mechanism periphery of the hood. It is side surface sectional drawing which shows the intermediate support mechanism periphery of the said hood in a door full open state. It is side surface sectional drawing which shows the intermediate support mechanism periphery of the said hood in a door half open state. It is side surface sectional drawing which shows the intermediate support mechanism periphery of the said hood in a door fully closed state. It is the side view which modeled the surroundings of the raising / lowering door of a fully open state in the said food | hood. It is the side view which modeled the raising / lowering door periphery of a half-open state in the said hood. It is the side view which modeled the surroundings of the raising / lowering door of a fully closed state in the said hood. It is the perspective view which modeled the raising / lowering door periphery of the fully open state in the said hood. It is the perspective view which modeled the raising / lowering door periphery of the half-open state in the said hood. It is the perspective view which modeled the raising / lowering door periphery of a fully closed state in the said hood. It is a top view which shows the outer side multistage pulley periphery in the said hood. It is the YY sectional view taken on the line of FIG. It is the ZZ sectional view taken on the line of FIG.

Explanation of symbols

1 ... Food for test bench (table hood)
2 ... Hood main body 21 ... Front opening 26 ... Vent 3 ... Post 30 ... Hollow part 51, 52 ... Lift door 6 ... Intermediate support mechanism 60 ... Substrate (fixing member)
611, 612 ... Fixed rail (fixing member)
621, 622 ... movable rail 7 ... rotating shaft 71a, 72a, 71b, 72b ... pulley (door pulley)
73b, 74b ... pulley (weight pulley)
75a, 75b, 76b, 77b ... wire 8 ... balance weight

Claims (7)

A plurality of elevator doors are arranged in parallel along the frontage direction at the front opening of the hood body installed on a work table such as a test bench, and the opposite side edge of the elevator doors adjacent to the frontage direction is an intermediate support mechanism A tabletop hood that is slidably supported by the upper and lower doors so that the front opening is opened and closed by raising and lowering the elevating door,
The intermediate support mechanism is
A fixing member provided on the upper side of the hood main body corresponding to the opposite side edge of the lift door;
It is supported by the fixing member so as to be vertically slidable in a state of being arranged along the vertical direction, and when it is slid downward, it moves into the front opening, and when it is slid upward, it is retractable from the front opening. Rails, and
A desk hood, wherein the opposite side edge of the elevating door is supported by the movable rail, and the movable rail is advanced / retracted with respect to the front opening as the elevating door is raised / lowered. The plurality of elevator doors arranged in parallel have first and second elevator doors, respectively.
The movable rail has first and second movable rails corresponding to the first and second lifting doors, respectively.
The opposing side edge of the first lifting door is fixed to the first movable rail, and the opposing side edge of the second lifting door is slidably supported along the vertical direction with respect to the second movable rail,
The first movable rail is slid upward with respect to the fixed member, the second movable rail is slid upward with respect to the fixed member, and the second lift door is moved upward with respect to the second movable rail. In the slid state, the first and second lifting doors are arranged to overlap in the front-rear direction in the upper part of the hood body,
The first movable rail is slid downward relative to the fixed member, the second movable rail is slid downward relative to the fixed member, and the second lift door is further downward relative to the second movable rail. The table hood according to claim 1, wherein in the slid state, the first and second elevating doors are arranged side by side so as to close the front opening. A rotary shaft extending along the frontage direction is provided at a position above the elevator door in the upper portion of the hood main body so as to be rotatable around its axis.
A door pulley is fixed to both ends of the rotating shaft, and a weight pulley is fixed to one end,
The upper and lower ends of the elevating door are respectively suspended by the wire wound on the door pulley, and the balance weight is suspended by the wire wound on the weight pulley,
The tabletop hood according to claim 1 or 2, wherein the lift door is configured to be held at a desired slide position by being balanced in weight between the lift door and the balance weight.   4. A tabletop hood according to claim 3, wherein struts are provided on both sides of the front surface of the hood body, a hollow portion extending in the vertical direction is provided in the strut, and the balance weight is accommodated in the hollow portion so as to be movable up and down. .   The desktop hood according to claim 3 or 4, wherein the balance weight is suspended from the weight pulley by a plurality of wires. A vent is provided on the upper side of the hood body,
6. The structure according to claim 1, wherein the vent is closed by the elevator door when the elevator door is raised, and the vent is opened when the elevator door is lowered. Tabletop food according to any of the above. The fixing member of the intermediate support mechanism includes a substrate fixed to the upper portion of the hood main body, and a fixing rail fixed to the substrate in a state of being arranged along the vertical direction,
The tabletop hood according to any one of claims 1 to 6, wherein the movable rail is supported so as to be slidable in the same direction in a state where the length direction of the movable rail coincides with the fixed rail.

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