Note: Descriptions are shown in the official language in which they were submitted.
REMOVABLE ABRASIVE SLEEVE FOR A NAIL CARE DEVICE
The invention is related to manicure or pedicure accessories, namely to nail
care devices, such as hand nail files.
There are known similar replaceable abrasives for the nail care devices,
among which the closest are the following. There is a nail file containing a
metal
working plate, one or both sides of which have areas with an abrasive element.
The
abrasive element is replaceable and intended for single use only. The
replaceability
of the abrasive element is achieved by the fact that on one of its sides is
applied an
adhesive layer and by means of this layer the abrasive element is connected to
the
io working plate (UA Patent 122100 U, published on December 26, 2017). The
disadvantage of such an abrasive element is the lack of reliability of its
fixation on
the working plate only by means of an adhesive layer applied to one side of
the
abrasive element, and the possibility of shifting of the abrasive element
during
operation due to lack of mechanical fixation on the working plate. In this
case, the
reliability of fixation for such an abrasive element will depend on the
quality of the
adhesive layer and the strength of its adhesion to the surface of the working
plate,
which, in turn, will complicate the peeling of the abrasive element when
replacing it.
The prototype is a removable abrasive sleeve of the device for nail care,
described in UA Patent 118314 U, published on July 25, 2017. The sleeve
according
to the prototype contains a base in the form of a flat or flat-oval tube, the
surface of
which has an abrasive working part. The base provides the ability to quickly
put on
the working plate by moving the working plate into the cavity of the tube of
the
base, followed by its removal after wear of the abrasive working part and
replacement with a new abrasive sleeve. The abrasive working part is made in
the
form of an abrasive cloth mounted on the base by gluing. The disadvantage of
this
solution is the insufficient strength of the base, the integrity of which can
be
damaged during the use of the device for nail care, for example, when it
breaks,
which reduces the reliability of the removable abrasive sleeve and the
possibility of
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injury to the treated nail surface. Bonding of the abrasive cloth over the
entire
surface of the base, especially in the rounded flat or flat-oval tube, as well
as the
lack of damping of the abrasive working part of the nail care device in the
design of
the prototype can lead to the reduction of reliability and safety of the
removable
abrasive sleeve.
The invention is based on the increasing the reliability and safety of use of
the
removable abrasive sleeve of the device by increasing the strength of the base
and
the reliability of the bonding of the abrasive cloth with the surface of the
base.
The problem is solved by mean of that in the removable abrasive sleeve of the
lo nail care device, which contains a base in the form of a flat or flat-
oval tube, the
surface of which has an abrasive working part, according to the invention, the
abrasive working part is formed by an abrasive cloth bonded to the flat
surface,
where the base is formed by a folded cloth of sheet material, the edges of
which are
fastened together overlapping each other to form flat surfaces on both sides
of the
base.
The base in the form of a flat or flat-oval tube, the surface of which has an
abrasive working part, allows the installation of a removable abrasive sleeve
on a
rigid core (for example, in the form of a flat elongated rectangular plate
with
rounded edges) of the nail care device by wearing a flat or flat-oval rigid
core along
its length. Whereas, the formation of the abrasive working part of the
abrasive cloth
bonded to the flat surface of the base, allows increasing the reliability of
the
bonding of the abrasive cloth to the surface of the base due to their contact
on a flat
surface over its entire area. The formation of the base of the rolled cloth of
sheet
material, the edges of which are overlapped with the formation of flat
surfaces on
both sides of the base, allows to increase the tensile strength of the base,
and
reduces and eliminates possible error when connecting the edges of the rolled
base
cloth, which increase the reliability of the entire base and simplify its
manufacture,
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as well as improve the reliability and safety of use of a removable abrasive
sleeve
mounted on a rigid core.
According to one of the preferred embodiments of the invention, the abrasive
cloth is bonded to the flat surface of the base with an adhesive, which
increases the
reliability of the connection and simplifies the manufacture of a removable
abrasive
sleeve.
According to another preferred embodiment of the invention, the abrasive cloth
is
bonded to the flat surface of the substrate by a layer of elastic material,
such as
ethylene vinyl acetate (EVA), glued simultaneously to the surface of the
substrate
io and the reverse surface of the abrasive cloth, which also increases the
reliability of
the microporous structure of the cell type elastic material, which gives
better
penetration of the adhesive, as well as provide additional damping of the
abrasive
work surface in contact with the nail when using a nail care device with a
removable
abrasive sleeve, which further increases the safety of the removable abrasive
sleeve.
When using a layer of elastic material, its thickness should be within 0.5-1.5
mm,
because tests have shown that the thickness less than the specified interval
leads to
virtually no damping effect, and the thickness greater than the specified
interval
significantly impairs the stiffness and evenness of the abrasive work surface.
According to another preferred embodiment of the invention, the abrasive cloth
is
bonded to the flat surface of the base and additionally bonded to the opposite
flat
surface of the base, which increases the durability of the removable abrasive
sleeve
by using both sides of the base when operating the nail care device.
According to yet another preferred embodiment of the invention, the cloth made
of
cellulose material is used for a base. In this case, the inner surface of the
base tube
is coated with a layer of polymer coating made of polyethylene, applied in an
amount 8-12 g/m2 at a density cellulose material cloth within 40-60 g/m2. This
further improves the reliability of fixing the base on the metal rigid core of
the nail
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care device by contacting the polymer coating of the inner surface of the base
with
the metal surface of the core and thereby preventing the base from slipping
out of
the nail care device. It was experimentally determined that the layer of
polymer
coating of polyethylene in the amount of 8-12 g/m2 at a density of cellulose
material
cloth within 40-60 g/m2 allows to provide the necessary reliability of fixing
of a
removable abrasive sleeve as well as the easy removal of used sleeve from a
core by
its rupture.
According to another preferred embodiment of the invention, the thickness of
the abrasive cloth should be at least 0.2 mm. When testing the proposed
materials
1.0 for the base and abrasive cloth, it was found that the use of
abrasive cloth with a
thickness of less than 0.2 mm can lead to accidental damage from a relatively
small
effort, for example, when wearing a removable abrasive sleeve on the rigid
core of
the nail care device.
The following are examples of removable abrasive sleeve and its use with a
device
for nail care, illustrated by the following drawings:
- Fig. 1, showing a plan view of a removable abrasive
sleeve,
- Fig. 2, showing section A-A on Fig. 1 according to one embodiment of the
invention,
- Fig. 3, demonstrates view b on Fig. 2,
- Fig. 4, showing view B on Fig. 2,
- Fig. 5, showing section A-A on Fig. 1 according to another embodiment of
the invention,
- Fig. 6, demonstrates view b on Fig. 5,
- Fig. 7, showing view B on Fig. 5,
- Fig. 8, showing section A-A on Fig. 1 according to yet another embodiment
of the invention,
- Fig. 9, demonstrates view b on Fig. 8,
- Fig. 10, showing view B on Fig. 8,
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- Fig. 11, showing section A-A on Fig. 1 according to yet another
embodiment of the invention,
- Fig. 12, demonstrates view b on Fig. 11,
- Fig. 13, showing view B on Fig. 11.
These examples and images do not limit other possible embodiments of the
removable abrasive sleeve according to the invention, but only explain its
essence.
Removable abrasive sleeve for a nail care device (Fig. 2-4) contains a base
(1)
in the form of a flat or flat-oval tube, the surface of which has an abrasive
working
part (2). The base (1) is formed by a folded cloth (3) of sheet material, the
edges of
which (4) and (5) are fastened together to form flat surfaces (6) on both
sides of the
base (1). The cellulose material cloth (3), such as kraft paper with a density
in the
range of 40-60 g/m2 is used for the base (1). On the surface of the cloth (3),
which
forms the inner surface of the base tube (1), is applied a layer of polymer
coating -
polyethylene. The amount of such a polymer coating of polyethylene for the
cloth
(3) is in the range of 8-12 g/m2. Alternatively, the base (1) can be made
entirely of
polyethylene.
The abrasive working part (2) is formed by an abrasive cloth (7) bonded to the
flat surface (6) of the base (2) by an adhesive. The thickness of the abrasive
cloth is
0.2 mm. As one embodiment (Fig. 5-7), the abrasive cloth (7) is bonded to the
flat
surface (6) of the base (2) by a layer of elastic material (8), for example,
ethylene
vinyl acetate (EVA). The layer of elastic material (8) is glued simultaneously
to the
surface of the base (1) and to the reverse surface of the abrasive cloth (7).
According
to yet another embodiment (Fig. 8-10), the abrasive cloth (7) is bonded to the
flat
surface (6) of the base (2) and additionally bonded to the opposite flat
surface (6) of
the base (2). According to yet another embodiment (Fig. 11-13), the abrasive
cloth
(7) is bonded to the flat surface (6) of the base (2) by a layer of elastic
material (8)
and additionally bonded to the opposite flat surface (6) of the base (2) also
by a
layer of elastic material (8). For these embodiments can be used an abrasive
cloth
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(7) of the same grain size or different grain size on different flat surfaces
(6) of the
base (2). The thickness of the layer of elastic material (8) is in the range
of 0.5-1.5
mm, for example, 1 mm.
The above-described removable abrasive sleeve mounted on the rigid core of
the nail care device (not shown in the figures, but it is clear that it may be
in the
form of a flat metal work plate with rounded edges, or a plate of rectangular
or
other cross section) can be used as manicure or pedicure tool. Before use, the
removable abrasive sleeve is mounted on a rigid core by putting it on. During
operation, the sleeve is held on a rigid core without additional mechanical
fastening
or other means, such as adhesive bonding and the like. This fixation of the
sleeve to
the nail care device is achieved due to the tight fit of the base (1) on the
rigid core.
This ensures easy and free installation of the sleeve without excessive
effort. Then
the flat surface (6) of the base (2) with the abrasive cloth (7) is placed
parallel to the
surface of the nail and nail care is performed by contact of the abrasive
working part
(2) with the nail. The layer of elastic material (8) when used allows
softening the
contact of the abrasive working part (2) with the nail and increasing the
safety and
convenience of working with the device for nail care. Removal of the removable
abrasive sleeve is carried out by tearing (rupturing) the base cloth (1) by
applying a
certain force to it. In the case of using a removable abrasive sleeve with an
abrasive
cloth (7) located on both flat surfaces (6) of the base (2) alternately use
each
abrasive working part (2) or a flat surface (6) with an abrasive working part
(2) of the
desired grain size.
Such a removable abrasive sleeve can be made of a certain length, the size of
the rigid core of the device for nail care, or in the form of a roll
containing parts
divided by the weakened areas of material, obtaining after the torn off a
removable
abrasive sleeve of the desired length.
Thus, the claimed the invention provides an increase in the strength of the
base and the reliability of the bonding of the abrasive cloth to the surface
of the
base.
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