EP0080784A1

EP0080784A1 - Mouth-piece for device for grit-blasting with suction-remove

Info

Publication number: EP0080784A1
Application number: EP82201522A
Authority: EP
Inventors: Veluwse Industriele- en Handelsbelangen Stichting; Bouko Wilhelm Timmer
Original assignee: Individual
Current assignee: STICHTING VELUWSE INDUSTRIELE- EN HANDELSBELANGEN; Timmer Bouko Wilhelm
Priority date: 1981-12-01
Filing date: 1982-11-30
Publication date: 1983-06-08
Also published as: NL8105426A

Abstract

Mouth-piece for grit-blasting device with suction-remove, which mouth-piece comprises a member 6 preferably annular of cylindrical, that for example can be attached to or with the help of clamping means fixed onto the inlet 2 of a suction channel 3 of a grit-blasting device; that in this annular member around the inlet, is placed a wreath 11 of serried hair or one or more brushes. That inside the wreath of hair a deformable member 14 like a cylindrical bellows with one or more constrictions has been placed.

Description

The inveniton relates to a mouth-piece for a device like a grit-blasting device with suction-remove, which mouth-piece consists of a member preferably annular or cylindrical, that has been fastened, or by means of clamps has been connected, to the inlet of a suction channel of a grit-blasting device and in this annular part around the central orifice a wreath of hair or one of more brushes has been placed.
Generally known is the technique of sand-blasting articles. Under great force sand is spouted or blasted against an object, which causes undesired particles to be removed from the surface. Sand-blasting technique has been develloped further. At this moment most of the devices used, utilize a suction-device, to directly suck away the material which has been used to blast with. This removal is of great importance because when sand of other materials, with which can be blasted efficiently, are regularely inhaled, it will in time cause damage to a persons" health.
At present a generally known technique is, that by means of the suction mouth of the grit-blasting device the stream of grit material is directed onto the surface of the object and removed from the object through the same mouth; such a device is known as a grit-blasting device with suction-remove or a "suction-grit-blasting device". It has the advantage, that when the suction mouth has a wreath of hair or brushes or has been closed by other means, all the material which has been blasted onto the object together with the surface particles, which have been loosened from it, will be sucked away before they can come into the surrounding air and therefore cannot become detrimental to the health. An extra advantage is, that the grit can be recaptured, cleaned and re-used, which is of an economical interest, because the present used grit has a greater effectiveness but is more expensive than the sand, which had been generally used and which is always available.
Suction-grit-blasting devices are very usefull to grit-blast flat surfaces; However when edges or rough surfaces have to be grit-blasted, then the brushes around the suction mouth will not remain completely closed.
The aim of the invention is a mouth-piece with which it is possible to grit-blast edges and surfaces on which there are ribbons, by means of a suction grit-blasting device while the grit cannot escape through the crefice between the hairs or brushes.
This aim of the invention has been attained by inserting a deformable piece, for example a cylindrical case, inside the wreath of hair around the inlet orifice. With this piece, it is possible to grit-blast edges, because when the brushes no longer form an air-tight surrounding of the inlet, the deformable piece will serve as a tight sleeve.
By preference the deformable piece is a bellows with one or more annular grooves or constrictions. The outlet of the bellows is pliable and for this reason will be better adaptable to edges. Therefore, the deformable piece is preferably made of an elastic material, such as rubber, leather of plastic, and should be slightly conical to obtain the best flow of the sucked off grit material.
By means of the drawings the invention will be explained. In the drawings are:

Fig. 1 a cross-section of the mouth-piece on the outlet of a sucktion-gritblasting device;
Fig. 2 a side view of the mouth-piece as shown in figure 1, placed on-the edge of an object to be grit-blasted.

Figure 1, the cross-section, shows a mouth-piece 1 clamped onto the suction inlet orifice 2 of the suction channel 3 of a grit-blasting device. The suction channel 3 encompasses an elbow piece 4 to which is connected a flexible hose (not shown in the drawings). In the elbow piece 4 a nozzle 5 is fixed through which the grit material can be blown under high pressure.
The mouth-piece consists of an annular member 6, which is double walled and in which, between the outer wall 7 and the inner wall 8, two annular brushes 9 and 10 can be clamped. The annular component 6 is made out of plastic, which makes the walls slightly deformable, so that the brushes can be better fastened into it, The brushes 9 and 10 consist of hairs, which are fastened into an annular metalic clamp 12.
The inner wall 8 of the annular component 6 has a rim 13 which points towards the inside and against which one end of a deformable member or bellows 14 can be fastened by means of a clamping ring 15. The deformable component or bellows 14 has two constrictions 16 and 17.
In figure 2 is shown, how the bellows takes over the function of the wreath of hair when an edge 18 of an object 19 has to be grit-blasted. The hair 11 of the brushes will be separated at two places due to the edge 18 of the object 19. This causes a crevice 20, which will be so large that the grit can easily escape. By pressing the mouth-piece firmly against the edge 18, the deformable component of bellows 14 will try to envellope the edge 18. Through the very small remaining opening 21 hardly any grit will escape because the suction force of the suction-gritblasting device is normally large enough to minimize the loss.

Claims

1. Mouth-piece, for example, for a gritblasti.ng device with sucktion-remove, which mouth-piece comprises a member (6) preferably annular or cylindrical, that for example can be attached to or with the help of clamping means fixed onto the inlet of a suction channel (3) of a grit-blasting device and that in this annular member (6) around the inlet, is placed a wreath of serried hair or one or more brushes, characterized by, that around the inlet, inside the wreath of hair (9, 10) a deformable member (14), like a cylindrical bellows, has been placed.

2. Mouth-piece according to claim 1, characterized by, that the deformable member (14) is a bellows with one or more constrictions (16, 17).

3. Mouth-piece according to one of the clains 1 or 2, characterized by, that the deformable member (14) has been made of a pliable material, such as rubber, leather of plastic.

4 Mout-piece according to one of the claims 1, 2 or 3, characterized by, that the deformable member (14) is slightly conical.

5. Mouth-piece according to one of the caims 1, 2, 3 or 4, characterized by, that inside the annular of cylindrical member (14), near the inlet opening, a rim (13) pointing towards the inside has been made,-in such a way that the deformable member (14) can be fixed in place by means of a clamping ring (15).