[0001] 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.
[0002] 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.
[0003] 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.
[0004] 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.
[0005] 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.
[0006] 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.
[0007] 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.
[0008] 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.
[0009] 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.
[0010] 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.
[0011] 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.
[0012] 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.
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).