Abstract
An industrial brush to remove material, of the type known as bowl
headed, consisting of a rotating tool which is connected by means
of an upper nut (3) to pins or bolts protruding from portable machines
. This brush has a bowl shaped head (2) connected o the said nut (3)
and a set of metal wire s or bristles (8) that come from the interior
of the bowl shaped head and extend to form a hollow tubular space,
either cylindrical or trunco-conical, which open out as a form of
barrier when the brush rotates.
Claims
1. Industrial brush, of the type which are composed of a bowl shaped
head (2, 6) with a central hole (7) in order to receive a nut (3)
that enables the securing of the brush to the drive machine that it
is connected to, which has a set of steel wire bristles (8) arranged
below the bowl shaped head (2, 6) and appropriately secured to the
interior (10) of the body of the brush, with these bristles usually
being established in a cylindrical or trunco-conical shape in their
rest position, and opening outwards slightly when the brush is in
movement, in its working position, which is characterised in that
the ends of a set of relatively flexible thin plates (4) are secured
to the bowl shaped head (2, 6), with these plates extending towards
the exterior, outside and over the bristles, and preferably occupying
the whole of the side surface formed by the said bristles in the rest
position of the brush, in that these thin plates (4) open out and
rise when the brush is in movement, forming a physical barrier that
protects the machine operator not only from fragments of the brush
bristle filaments but also from the material removed from the work
piece by the brush.
2. Industrial brush, in accordance with claim 1, characterised
in that the position of the thin plates (4), in their open condition,
take the approximate shape of a continuous circular crown.
3. Industrial brush, in accordance with claim 1, characterised
in that the position of the thin plates (4), in their open condition,
take the approximate shape of a discontinuous circular crown
4. Industrial brush, in accordance with claim 1, in which the thin
plates (4) are preferably trapezoidal in shape.
5. Industrial brush, in accordance with claim 1, characterised
in that the thin plates (4) form the free ends of a body (9) arranged
between the outer body (2) of the brush and the inner body (10).
Description
DESCRIPTION
Purpose of the Invention This invention relates to an industrial
brush of the type which have wire bristles and are used to remove
material from work surfaces. Some of these bushes are of a specific
shape based on a bowl-shaped head inside which the wire bristles
are secured and protrude outwards, forming a hollow cylindrical
or trunco-conical shape.
[0001] The bowl-shaped heads of these brushes have a nut at their
base, by means of which they can be connected to a rotating tool
responsible for providing the rotation to the brush so it can be
used as a tool.
[0002] In units of this type, when rotation of the tool takes places,
unwanted projections are caused both of pieces of the filament of
the wire bristles and of the material which is continually removed
by the brush. These projected particles are dangerous for the integrity
of machine operators handling the tools, especially and particularly
for their eyes.
[0003] As far as is known, there is no record of technical solutions
aimed. at safeguarding machine operators from this type of possible
aggressions.
[0004] Therefore, the basic purpose of this invention is to provide
an industrial brush that prevents any particle thrown out by the
tool from causing injury to operators who are handling portable
tools, and especially their eyes.
[0005] In order to put this objective into practice, the invention
claims an industrial brush of the bowl head type, in which a set
of thin plates or leaves are arranged and secured by one of their
ends to the bowl, with their sides and free end extending towards
the bristles of the brush.
[0006] These thin plates are made of a material provided with a
certain flexibility, for instance a suitable plastic material, so
that when the brush is in the rest position, they are situated over
the bristles, covering the side surface formed by them.
[0007] When the brush is operated by the portable machine in question,
the revolving speed causes the thin plates to be raised due to the
centrifugal force, taking on the shape of a circular crown, contained,
approximately, in a plane that will be perpendicular to the axis
of the brush, thus forming a physical barrier that prevents the
particles thrown out by the brush from reaching unprotected parts
of the machine operator's body.
[0008] The ends of the thin plates can either be secured to the
outer surface of the bowl shaped head, i.e. on its visible part,
or otherwise in its interior, in the space provided between the
inner side of the bowl shaped head and the concealed surface if
the bristles.
[0009] In the same way, the ends of these thin plates could be
connected to ring-shaped items, with the ring in turn being situated,
according to its diameter, on the exterior or in the interior of
the bowl shaped head. This possibility, although less economical
that the previous one, offers the added advantage that the thin
plates, together with the said ring, can be exchangeable or replaced
by other if they should become unusable for any reason.
[0010] The thin plates can also be placed in the brush in the same
brush manufacturing operation, for example by placing them at the
same time as the wire bristles.
[0011] The plan view shape of the thin plates can be any that technique
suggests--square, rectangular, trapezoidal, in the shape of a circular
sector, etc., with the most appropriate being adopted in each case.
[0012] The thin plates can overlap. each other in the folded position,
so that when they are extended, in their working position, they
occupy the whole of the circular crown shape that they establish.
[0013] The thin plates might, on the other hand, not be overlapping
each other, but providing gaps when the brush is n operation, a
factor that does not interfere in the effectiveness of the protective
screen that they form, because the revolutions at which these machines
work prevents any particles from passing through.
[0014] All these and other details of the invention can be seen
on the accompanying sheets of drawings, on which the following are
represented:
[0015] FIG. 1 is a symmetric elevation view of a brush, in accordance
with one solution of the invention, shown in the rest position.
[0016] FIG. 2 is a plan view of the brush in accordance with the
invention, shown in the operating position.
[0017] FIG. 3 is an elevation view of the brush, shown as a cross
section along the line I-I in FIG. 2.
[0018] FIG. 4 is an elevation view of the brush, shown as a cross
section along the line II-II in FIG. 2.
[0019] Looking now at FIG. 1, we can observe the brush (1) with
the bowl shaped head (2), from inside which the wire bristles (8)
start and protrude out through the lower area (6) of the said bowl
shaped head.
[0020] The bowl shaped head has the upper nut (3) for its inter-connection
with the rotating machine responsible for providing the rotation
movement to the brush (1) The thin plates (4) come from the bowl
shaped head (2, 6) and in this rest position, they are arranged
over the bristles (8), as illustrated.
[0021] When the brush turns, FIG. 2, the flexibility that the thin
plates (4) are provided with makes them take the position shown,
for example, due to the centrifugal force. In the case shown, as
a result of the plan shape of the thin plates, some gaps (5) are
created between each two plates, although these gaps do not mean
any diminishing of the formation of the barrier, due to the high
revolutions at which these kind of brushes rotate, which makes it
impossible for particles to pass through these gaps.
[0022] In FIGS. 3 and 4 we can observe the purpose of the invention
more clearly, with the thin plates (4) in their folded position
in FIG. 3, and in their open position when turning (M) of the brush
takes place by means of the application in the hole (7) in the nut
(3) of the appropriate portable tool.
[0023] The thin plates (4) preferably form part of a body or casing
(9) connected between the outer (2) and inner (10) casings of the
brush itself, as can be observed in FIG. 3.
[0024] The inner space (11) is where the wire bristles (8) are
received and suitably fixed to the inner casing (10) in a known
manner. |