GB2328642A

GB2328642A - Dust extracting system for routing cutters

Info

Publication number: GB2328642A
Application number: GB9818437A
Authority: GB
Inventors: Juergen Loewe
Original assignee: Robert Bosch GmbH
Current assignee: Robert Bosch GmbH
Priority date: 1997-09-01
Filing date: 1998-08-24
Publication date: 1999-03-03
Anticipated expiration: 2018-08-24
Also published as: GB9818437D0; DE19738091C2; GB2328642B; DE19738091A1

Abstract

The invention relates to a dust-extracting system, particularly for routing cutters. having an extracting arrangement that acts upon a working region by means of a vacuum. Provision is made for an essentially funnel-shaped hollow body (1) with an aperture (1a) to be associated laterally with the working aperture (3) of a sole plate (2) in such a way that a space above the said working aperture (3) has the funnel-shaped hollow body (1) at least partially engaging round it.

Description

Dust-extracting system for routing cutters The invention relates to a dust-extracting system for routing cutters, which has the features mentioned in the pre-characterising clause of claim 1.

Prior art In working operations with routing cutters, dust and chips from the workpiece occur on a large scale, and these remain on the said workpiece because of its horizontal disposition, and thus impair the view of the cutting surface. It is before necessary, particularly when machining wood, to remove the chips and dust from the workpiece quickly and, as far as possible, completely.

Extracting devices are commonly known. Thus, DE-OS 44 07 436 describes a routing cutter in which the sole plate of the cutter is constructed as a hollow body and which has, at the working aperture, slots through which the dust and chips from the workpiece can be extracted. Extracting devices of this type are expensive from the production engineering point of view and therefore lead to high prices which are only justified and acceptable in the professional sphere of use. In the hobby or do-it-yourself enthusiast's field, on the other hand, there is a lack of dust-extracting systems which are suitable, effective and easy-to-fit but which remove dust and chips from the cutting surface in an effective manner and do not hinder the changing and fitting of cutting heads. For this purpose, plastic hoods are often provided which, for their part, have the disadvantage that they become coated with dust and chips because of electrostatic charges. Because of this, a clear field of view ofthe cutting surface is likewise not possible. Dust-extracting systems of this type which are attached afterwards also hinder the use of parallel stops or copying guides so that, frequently, either the application of the routing cutter is restricted or else it is necessary to dispense with the use of the dust-extracting system.

The object of the present invention is therefore to overcome the disadvantages of the prior art.

Advantages of the invention The dust-extracting system according to the invention for routing cutters, which has the features mentioned in claim 1, offers the advantage that it is of simple construction and produces a high suction power because of the geometrical shape.

The dust-extracting system according to the invention is simple to produce and consists, at most, of two parts, namely the dust-extracting nozzle and, optionally, the suction union. The dust-extracting system according to the invention can be attached afterwards to conventional routing cutters and can remain on the routing cutter during any necessary tool changes and the like.

The dust-extracting system according to the invention can be produced from a metallic casting material or from plastic. In either case, simple manufacture from just a few individual parts is possible.

Since, moreover, the extracting system is fitted laterally, a parallel stop on the routing cutter can be effectively clamped fast, without intermediate clamping of the extracting system being necessary. Slipping of the routing cutter during the cutting operation is thereby avoided. In a preferred refinement, a suction union is guided away upwards, so that a suction hose connected to the said suction union can more easily be guided with the latter over the workpiece.

Other advantageous refinements of the invention emerge from the remaining features which are mentioned in the subclaims.

Drawing The invention will be explained in greater detail below, in one exemplified embodiment, with the aid of the appertaining drawing, in which: figure 1 shows a plan view of a diagrammatic cross-section of a dust extracting system.

Description of the exemplified embodiment Figure 1 shows, in a plan view, a cross-section through a dust-extracting system according to the invention. Within the limits of the present description, an explanation is to be given only of those components which are essential to the invention. The structure and function of routing cutters are commonly known.

Around a working aperture 3 in the sole plate 2 of the routing cutter there is disposed, as the dust-extracting nozzle 7, an essentially fimnel-shaped hollow body 1. The hollow body 1 engages only partially round the working aperture 3.

The underside of the dust-extracting nozzle 7 is flattened, so that the said dustextracting nozzle 7 lies flat on the sole plate 2. The upper side of the dustextracting nozzle 7 may likewise be flattened, so that two faces which are orientated parallel with one another are formed. As a result, the view of the workpiece or cutting surface is essentially unrestricted.

An opening la in the dust-extracting nozzle 7 encompasses an angle of up to 1800, and in the example, of about 1200, of the working aperture 3. The front region la of the dust-extracting nozzle 7 is constructed in such a way that the radius of the working aperture 3 is kept clear. The aperture la is adapted in shape to the working aperture 3. A suction union 6 is disposed opposite the aperture la. A vacuum source can be connected to the suction union 6. When the vacuum source is connected, chips occurring in the region of the working aperture 3 are extracted radially via the aperture 1 a.

There is an angle of about 90" between the suction union 6 and the dust-extracting nozzle 7. According to other exemplified embodiments, which are not shown, the union 6 may also be in alignment with the dust-extracting nozzle 7, or be connected to the latter in an articulated manner. As a result of this, the connection with the vacuum source can be easily varied - depending upon the workpieces to be machined.

Attached to the dust-extracting nozzle 7 are two tongues 5 which are secured to the sole plate 2 by means of screws and screw threads 5a. Operation of the routing cutter is not hindered by the dust-extracting system according to the invention, since guide pillars 4 for the cutting head remain freely accessible.

Because of the lateral arrangement of the dust-extracting nozzle 7, handling of the routing cutter is not impaired. Thus, for example, it is possible to change tools without demounting the dust-extracting nozzle 7. Because the dust-extracting nozzle 7 is fixed on the sole plate 2 via the screwed connection 5, a change in position during use in the intended manner is ruled out. As a result of this, a high degree of safety is guaranteed.

Claims

Patent claims

1. Dust-extracting system, particularly for routing cutters, having an extracting arrangement that acts upon a working region by means of a vacuum, characterised in that an essentially funnel-shaped hollow body with an aperture is associated laterally with the working aperture of a sole plate in such a way that a space above the said working aperture has the funnel-shaped hollow body at least partially engaging round it.

2. Dust-extracting system according to claim 1, characterised in that an underside of the hollow body lies flat on the sole plate.

3. Dust-extracting system according to one of the preceding claims, characterised in that an angle of opening of the front aperture of the funnelshaped hollow body amounts to between 90" and 1800.

4. Dust-extracting system according to one of the preceding claims, characterised in that, for the purpose of forming a dust-extracting nozzle, the hollow body comprises a suction union which can be connected to the vacuum source.

5. Dust-extracting system according to one of claims 1 to 2, characterised in that a suction union is disposed opposite the front aperture.

6. Dust-extracting system according to claim 3, characterised in that the suction union is at an angle of about 900 to the funnel-shaped hollow body.

7. Dust-extracting system according to one of the preceding claims, characterised in that the suction union is disposed on the hollow body in an articulated manner.

8. Dust-extracting system according to at least one of the preceding claims, characterised in that the hollow body has at least one tongue via which the said hollow body can be secured to the upper side of the sole plate.

9. Dust-extracting system according to one of the preceding claims, characterised in that the hollow body consists of a metallic casting.

10. Dust-extracting system according to one of the preceding claims, characterised in that the hollow body consists of a plastic moulding.

11. Dust-extracting system substantially as herein described with reference to the accompanying drawing.