EP1348497A2 - Bottom tray for a safety workbench - Google Patents

Abstract

The tray (6) is installed under the workbench, which has drainage holes. It has a flat floor (7) which slopes down to a drain (9) in one corner. There are sharp folds (10) at the edges of the floor and there are side walls (8) which may slope and are curled over (11) at the top to make vertical outer walls (14). There may be narrow horizontal surfaces (13) at the top of each side wall.

Description

The invention relates to a floor pan for arrangement in the lower section of a work space a safety cabinet.

Floor trays for safety cabinets are required to hold amounts of material such as liquids from the work area. These quantities of material come from the worktop in the work area via air intake slots or slots in the worktop area into the floor pan.

The disadvantage of such floor trays is that small amounts of material are contained in the floor tray collected, do not flow to a collection area by themselves. By bombing the floor pan can create a drainage direction for the quantities of material. This Arching the floor pan requires additional, costly and time-consuming Operations. The results obtained regarding the flow of liquids are also not satisfactory. Bombing also creates stress in the component, which lead to undefined "bending states" of the floor pan.

Another possibility for the production of floor trays with a defined collection area is the deep drawing of sheet metal. Such deep-drawn floor trays are in small quantities very expensive, and the high tool and machine costs are not economically viable.

The object of the invention is accordingly with a floor pan for safety cabinets to provide a defined collection area, which can be produced inexpensively in small quantities is. There should be as few additional and complex work steps as possible.

This problem is solved with the floor pan according to claim 1 and the method according to claim 12. The preferred embodiments and process variants are the respective See subclaims.

The floor pan according to the invention has a floor area surrounded by side walls in the deepest area of which there is a collection area, the floor area at least partially sloping towards the collection area and being the height the side walls tapering towards the collection area in the direction of the collection area takes.

The floor area of a floor pan according to the invention can therefore also run horizontally Have floor area sections. At least one floor area section is in the direction of inclined the collection area. The floor area can also be designed in steps.

In order to ensure an even flow of material, it is advisable in Substantially the entire area of the floor area sloping towards the collecting area, preferably continuously falling, inclined. The height of the side walls therefore increases accordingly continuously towards the collection area. In such a case there is advantageously the gathering area in a corner of the floor area. From this collection area, the collected liquid can be removed very easily. The liquid can be removed by hand from the Collection area can be eliminated, or the liquid can drain the collection area through a drain leave with an opening in the floor area. The drain opening can take various forms to have. It can be elongated, circular or any other shape imaginable. A closable drain line can also be arranged at the outlet.

In another embodiment according to the invention, the bottom area can point in the direction of one of its side edges or part of its side edges be inclined. It is also preferred here the slope is continuous. In this case, the collection area is in the area an edge of the floor area of the floor pan.

The collecting area can also be located essentially in the middle of a side edge of the bottom area are located. The side wall adjacent to the collecting area is then divided into two side wall sections that run from the corners of the side wall towards the collection area. In such an embodiment, the height of the side wall sections in each case Towards the collection area. The inclination is preferably continuous again, so that the height of the side wall sections also increases continuously. The maximum height of the side wall is thus in the middle of it, where the side wall sections meet, while the minimum height of the side wall is formed at the side end.

As mentioned, according to the invention the height of the side walls tapering towards the collecting area increases to. So not all side walls of the floor pan have a changing height exhibit. It is therefore possible for at least one side wall or a side wall section has a substantially constant height over its length. It is then expedient to do so this side wall adjoining floor area section in a horizontal plane.

In order to save space and material, the floor area is expediently only as much as is currently required inclined to the horizontal direction to ensure sufficient fluid drainage. An angle of inclination between 0.5 ° and 10 °, especially between 1 and 3 °, is recommended. The side walls can form an angle of 90 to 150 ° to the floor area, whereby an angle between 120 to 140 ° is preferred.

The mounting of the floor pan in a safety workbench can basically be done in the state of the Technology done in the usual way. The ones remote from the floor area run accordingly Top edges of the side walls are expedient essentially in one plane, in particular in one essentially horizontal level.

The floor pan seals the work area downwards. For sealing the floor pan in The conventional sealing materials are expediently used in the safety workbench.

In order to seal the floor pan in the corners, the front edges are close together bordering side walls or side wall sections connected together, expedient welded.

The invention also includes a method for manufacturing the floor pan. The floor pan by bending the side walls from a sheet metal in such a way that the bending edges, which side edges of the floor area correspond to the floor pan, at an angle to the upper edges of the side walls run, so that when folding the surrounding area Side walls or side wall sections, each increasing in the direction of the collection area Height arise.

The advantage of the manufacturing process is that only simple and inexpensive tools and Machines are required. The unwound floor pan according to the invention is made from sheet metal cut out. The cutting out can be done, for example, either by punching or using today's very inexpensive and flexible laser cutting. Especially that Laser cutting is suitable for small quantities because there are no additional tool costs in contrast to punching. Folding can be done with a conventional folding bench or press can be executed.

Floor trays according to the invention can thus be inexpensive and simple in small quantities getting produced.

In order to save material, the floor pan can be essentially made from one rectangular sheet can be cut out. Preferably serves as the starting material for the invention Process a slightly trapezoidal sheet.

To simplify the manufacturing process of a floor pan according to the invention, before folding the side walls in areas of adjacent side walls or side wall sections cut-outs from the sheet, hereinafter called gusset. The gussets are basically in the corners of the processing of the floor pan. is the gathering area in the area between two side wall sections, gussets can also be cut in the middle of side walls. The collection area of the finished floor pan is therefore located in the central area of the corresponding side edge of the floor area.

The side walls are preferably at an angle of 90 to 150 °, in particular 120 to 140 °, folded to the floor area. Reasons for this are, among other things, that the material quantities easier to catch and easier to lead to the collection area.

The upper area of the floor pan is preferably designed like conventional floor tubs, to be able to fit them into safety cabinets according to the state of the art. Therefore the sheet in the area of the upper side walls of the floor pan, for example Appropriately along the upper edges of the floor pan as seen from the floor area to the outside folded.

As one of the last work steps, the sheet metal edges of adjacent side walls and / or sheet metal areas bent to the outside connected to one another, expediently welded.

The invention is explained in more detail below with reference to drawings.

Fig. 1 shows schematically a safety workbench with a built-in invention Floor pan in side view.

Fig. 2 shows schematically the developed floor pan of FIG. 1 in the Top view of how it is cut out of a sheet.

3 shows schematically the floor pan according to the invention from FIG. 1 in an isometric view View.

FIG. 4 schematically shows the floor pan according to the invention from FIG. 1 in a front view.

Fig. 5 shows schematically the floor pan according to the invention of Fig. 1 in a side view.

Fig. 6 shows schematically the floor pan according to the invention of Fig. 1 in plan view.

The safety workbench 1 shown in FIG. 1 essentially corresponds to a conventional one Safety workbench 1, as described for example in DE 44 41 784 C2. A frame 2 encloses a work area 3, in which samples can be processed. On the The front of the safety workbench 1 (in the figure on the left) is the work area 3 above a working opening is accessible, which can be closed with a windscreen. During the Processing samples in the work area 3 and cleaning the worktop 4 can be minor Amounts of material through air intake slots 5 in the worktop 4 or slots between Worktop sections fall or flow into the underlying floor pan 6. The air intake slots 5 are required to circulate air inside the workbench. The floor pan 6 has dimensions such that it can be fitted into the frame 2. It is important that the floor pan 6 seals the work area 3 from below, so that no materials can escape from the safety cabinet 1. Preferably located the collection area 9 of the floor pan 6 on the long side of the working opening, thus by hand if necessary, remaining stocks of the material quantities are pushed towards the collecting area 9 can. The upper edges 11 of the side walls 8 lie in a horizontal plane, so that the Worktop 4 can be used flat on the floor pan 6. The barrier 16 of the floor pan 6 is flush with the worktop 4, as shown in Fig.1 and in the state the technology is common.

The starting point for the production of the floor pan 6 is a corrosion-resistant sheet, whereby a brushed stainless steel sheet is preferable. This sheet material has the advantage that the liquids and amounts of material collected in the floor pan 6 drain off well leaves. The sheet also has a film coating for protection during processing. The Foil is only completely removed after completion of the floor pan 6.

The sheet is a flat development of a floor pan 6 according to the invention, as in Fig. 2 is cut out. Advantageously, the settlement from the sheet metal cut out with a laser. This process is inexpensive for small quantities and very flexible with regard to the shapes to be cut out.

Therefore, laser cutting is ideally suited to the required recesses with each different sizes from the corners of the flat development of the floor pan 6 to to cut. These recesses, hereinafter called gusset 12, are made with it when folding the side walls 8, sheet metal material does not overlap on the end faces of the side walls 8 and to then weld the end faces of the side walls 8 flush. The Lengths of the end faces of the side walls 8 thus essentially correspond to the lengths of the Sides of the gusset 12. The length of the end faces of the side walls 8 is determined on the one hand about the height of the side walls 8 and the other about the angle to be included between the floor area 7 and the side walls 8. The height of the run-up to the drain Side walls 8 increases in the direction of the collecting area 9, so that the collecting area 9 is at the lowest point of the floor area 7. It follows here that the end faces the side walls 8 are the longest in close proximity to the collection area 9 and the end faces of the side walls 8 that are farthest from the collection area 9 are the shortest. The smallest gussets 12 are thus furthest away from the collecting area 9 and are the largest closest to collection area 9. From the requirement of continuously increasing height of the side walls 8 in the direction of the collecting area 9 results in the example shown that the Bending edges 10, which correspond to the side edges of the base region 7 of the base tray 6, run obliquely apart from the later upper edges 11 of the side walls 8.

On the side walls 8 there are at least two further rectangular approaches each only result from further folding. So you're on the unwound, cut out Sheet metal, as shown in Fig. 2, basically not yet recognizable, but to a single one rectangular approach fused. The first rectangular approach is to use a horizontal one Frame with horizontal frame surfaces 13 to create the tub. The second rectangular extension 14, which is bent at right angles to the horizontal frame surface 13, serves to connect the floor pan 6 flush with the frame 2 of the safety workbench 1. On the later rear side wall 8 of the floor pan 6 close to the vertical Approach 14 two more right-angled approaches, which form a kind of hook after folding. On the later front side wall 8 follow the approach for the horizontal frame surface 13 still another four right-angled approaches, which after folding a barrier 16 with create a final fold for hooking. This barrier 16 prevents liquids easily get out of the work area 3. 5, this folded barrier 16 is of the side recognizable as an inverted U-shaped approach. The last chamfered area of the barrier 16, which forms an end fold, can be used to hook and seal the floor pan 6 serve in the safety workbench 1.

For better understanding, the edges along which the edge is folded are marked with a in FIG dashed line.

To attach the floor pan 6 to the frame 2 of the safety workbench 1 are in the Approach for the vertical side wall 14 holes 15 attached through which suitable fasteners can be performed. The vertical side walls 14 have lower end edges, which run essentially horizontally in the finished floor pan 6.

The end faces of the neighboring rectangular approaches are in the corners welded together.

A larger hole, which serves as a collection area 9, is located on the extended one Line direction of the tip of the largest gusset 12, i.e. in one of the corners of the bottom region 7 the finished floor pan 6.

3 illustrates an isometric view of a floor pan 6 according to the invention in the finished state assembled condition. The floor pan 6 has a collection area 9, which is used here as an outlet is formed with a hole-shaped opening in the left front corner with respect to the work opening the safety workbench 1. As with the left and rear side wall 8 in 3, the bending edges 10 run obliquely to the upper edges 11 of the side walls 8. The horizontal frame surfaces 13 are narrower than on the end faces of the floor pan 6 here on the long sides. Overall, the frame surface 13 has a substantially rectangular Contour, as they also have conventional floor trays.

4 and 5 show the different angles of inclination of the base area 7 opposite the horizontal in the longitudinal and transverse directions of the floor pan 6.

In FIG. 6, the bottom area 7 is inclined with the top edges 11 of the side walls 8 Bending edges 10 clearly shown again. The essentially rectangular contour of the The frame area comes into its own in this view.

COVERS LIST

1

Safety Cabinet

2

frame

3

working space

4

countertop

5

air sucking

6

floor pan

7

floor area

8th

Side wall

9

collecting area

10

bending edge

11

Top edge of a side wall

12

gore

13

Horizontal frame area

14

Vertical sidewall

15

drilling

16

barrier

Claims (16)

Floor pan (6) for arrangement in the lower section of the work space (3) of a safety workbench (1) which has a floor area (7) surrounded by side walls (8), in the deepest area of which there is a collection area (9),
characterized in that the bottom area (7) is at least partially inclined towards the collecting area (9) and that the height of the side walls (8) running towards the collecting area increases towards the collecting area (9). Floor pan (6) according to claim 1,
characterized in that essentially the entire surface of the bottom area (7) has an incline falling towards the collecting area (9). Floor pan (6) according to claim 1 or 2,
characterized in that the bottom area (7) is continuously inclined and the height of the side walls (8) increases continuously towards the collecting area (9). Floor pan (6) according to one of claims 1 to 3,
characterized in that the collection area (9) is located in a corner of the floor area (7). Floor pan (6) according to one of claims 1 to 3,
characterized in that the bottom region (7) is inclined towards one of its side edges or part of its side edges. Floor pan (6) according to one of claims 1 to 5,
characterized in that the base region (3) is inclined to the horizontal direction with an inclination angle of 0.5 ° to 10 °, in particular 1 ° to 3 °. Floor pan (6) according to one of claims 1 to 6,
characterized in that the side walls are bent at an angle of 90 to 150 °, in particular 120 to 140 °, to the floor area (7). Floor pan (6) according to one of claims 1 to 7,
characterized in that the upper edges (11) of the side walls (8) remote from the base region (7) run essentially in one plane, in particular in a substantially horizontal plane. Floor pan (6) according to one of claims 1 to 8,
characterized in that end edges of adjoining side walls (8) or side wall sections are welded together. Floor pan (6) according to one of claims 1 to 9,
characterized in that the collecting area (9) is designed as a drain and in particular as an opening in the bottom area (7). Floor pan (6) according to one of claims 1 to 10,
characterized in that a closable drain line is arranged at the outlet. Method for producing a floor pan (6) according to one of Claims 1 to 11,
characterized in that it is produced by folding the side walls (8) out of a sheet metal, such that the bending edges (10), which side edges of the base region (7) correspond to the base tray (6), obliquely to the top edges (11) of the side walls (8) run so that when folding, the side walls (8) or side wall sections surrounding the bottom area (7) are formed, each with a height increasing in the direction of the collecting area (9). Method according to claim 12,
characterized in that gussets (12) are cut from the sheet metal in the region of adjacent side walls or side wall sections before the side walls (8) are folded. A method according to claim 12 or 13,
characterized in that the side walls (8) are bent at an angle of 90 to 150 °, in particular 120 to 140 °, to the floor area (7). Method according to one of claims 12 to 14,
characterized in that the sheet in the area of the upper side walls of the floor pan (6) along the upper edges (11) of the floor pan (6) from the floor area (7) are bent outwards. Method according to one of claims 12 to 15,
characterized in that the sheet metal edges of adjacent side walls (8) and / or sheet metal areas which are bent outwards are welded to one another.

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