Note: Descriptions are shown in the official language in which they were submitted.
The present invention relates to a writing or painting
instrument provided with a fibrous point-tuft, and more
partlcularly to one provided with a novel holder for shaping the
fibrous point-tuft into a desired form having a desired
noncircular cross-section.
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Hereinbelow, the writing instrument means a so-called
writing brush, while painting instrument means an instrument for
applying manicure (or pedicure) liquid or the like.
Hitherto, writing or painting instruments have been
provided with a fibrous point-tuft a cross-section of which is a
noncircular shape, for example such as a hand-like shape, and
there has been a problem in that it is difficult to manufacture
1 shapes of such point-tufts into a noncircular form in cross-
section. Namely, a point-tuft having a circular shape in its
cross-section can be easily manufactured, and substantially does
not suffer from deformation in use. In contrast with this, a
point-tuft having a noncircular cross-section requires some
2~ measures for preventing deformation in use since it is not
possible to shape up its figure through a simple binding
operation thereo~. As a result, such point-tuft having a
noncircular cross-section makes its manufacturing operation
complex and increases the production costs thereof. Further, in
case that the instrument requires an air escaping aperture which
is provided in a certain portion of the shaft of the instrument,
the instrument b~comes more complex in construction. various
attempts to resolve these problems have been made over the years
but without success.
3U The present invention resolves the above problems
inherent in the conventional writing or painting instrument by
providing a writing or painting instrument in which a point-tuft
is held by a tubular holder provided with a front end opening
having a desired shape, which holder has at least one groove in
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its peripheral wall over the full length thereof in its
longitudinal direction.
The holder may be substantially made of any materials,
such as, metal or plastic, provided that the materials are
suitably selected in consideration of various properties thereof
!i such as a resistance to ink or paint liquid.
The opening of the holder may take any shape into which
shape the point-tuft is shaped in its cross-section. The holder
of the present invention is suitable especially for point-tuft
having a noncircular cross-section, but naturally may be employed
with a point-tuft having a circular cross-section.
The holder is essentially tubular, and may be provided
with a boss in its rear portion for facilitating mounting thereof
l~i in the writing or painting instrument.
A bore of the holder may have a constant cross-section
over a full length of the holder, or may have various cross-
sections throuyhout the bore. For example, the bore of the
holder may be so constructed that the front end opening thereof
has a substantially s~uare cross-section which is gradually
changed lnto a clrcular cross-section toward a rear opening of
the bore. It is also possible to vary the cross-section of the
bore in a manner that the area of the bore gradually increases
2~ toward the rear end opening of the holder.
The holder may be provided with at least one groove in
its outer peripheral wall over a full axial length of the holder
to conduct air escaping. It ls possible to establish the number,
3U shape and position of the grooves as is deemed proper.
In case that ink or paint liquid contained in the
writing or painting instrument is fed to the point-tuft, it is
thought best to feed to the point-tuft from the rear end opening
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of the holder by the use of a conventional means. However, it is
also possible to feed the ink or paint liquid to the point-tuft
through an opening provided in a peripheral wall of the holder if
necessary.
The point-tuft to be held by the holder of the present
invention may be made of any materials, such as, natural bristle,
synthetic bristle, etc.
Thus according to one aspect thereof the present
invention provides a writing or painting instrument comprising:
(a) a point-tuft; (b) a tubular holder for said polnt-tuft having
a front end portion and rear end portion; (c~ means for feeding
liquid to and through said holder from said rear end portion to
said front end portion; (d) said point-tuft being held in said
front end portion and pro;ecting from the front end portion for
use; (e) said front end portion of said holder having an opening
of a cross-section differing in shape from the cross-sectional
shape of the point-tuft, 50 as to deformably hold said point-
tuft; and (f) at least one groove in the outer peripheral wall of
said holder extending longitudinally along said holder to allow
for the passage of air. Sultably said front end opening of said
holder takes a substantially rectangular shape in cross section,
said r~ctangular shape being provided with outwardly expanded
arc-like minor sides. Desirably a bore of said holder gradually
increases in cross-sectional area from a front end of sald holder
2~ to a rear end o~ the same.
In another aspect thereof the present inventlon
provides a writing or painting instrument comprising: (a) a
point-tuft; (b) a tubular holder for said point-tuft having an
3~ opening at a front end portion thereof to receive and hold aid
point-tuft with the interior walls of the holder embracing and
shaping said point-tuft; (c) means for feeding liquid through
said holder and into said point-tuft for writing; and (d) said
holder having in its outer periphery at least one groove
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extending longitudinally along said holder.
The present invention will be further illustrated by
way of the accompanying drawing in which:
Fig. 1 is a perspective view of the holder for holding
the point-tuft of the writing or palnting instrument of the
present invention; and
FigO 2 is a central longitudinal sectional vlew of a
-~ writing brush provided with the holder of the present invention
shown in Fig. 1.
In Fig. 1, the reference character "A" denotes a holder
made of a synthetic resin, which holder "A" is capable of
1~ ~ embracing and shaping a point-tuft of the writing brush into a
flat shape and to hold such a point-tuft therein. The holder "A"
is constructed of a main body 1 having a circular pipe shape and
is provided with a boss 2 in its rear portion. The raference
numeral 3 denotes a bore for receiving a fibrous point-tuft to
2U hold the same and passes through the holder "A" in a longitudinal
direction. A cross-sectional shape of the bore 3 of the holder
"A" may be similar to that of the front end opening of the bore
3. Namely, the bore 3 may be constant in cross-sectional shape
and size throughout the holder "A".
2~
In the outer periphery of the holder "A", there are
provided four grooves 4 which are equally spaced in a
circumferential direction of the holder ~A~ and extend throughout
the holder ~A~ to conduct air escaping. The number of the
3~ grooves 4 may be at least one, and may be selec~ed by the user as
deemed necess~ry.
In the embodlment shown in ~ig. 1, both a main body 1
of the holder "A" and the boss 2 are cylindrical, i.e., have
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circular cross-sections. ~owever, it is also possible that they
take flat, ellipsoidal, rectangular or other shapes in cross-
section, conforming to the cross-sectional shape of the bore 3.
It is na-turally possible that the shape of a front end
opening portion of the bore 3 may be freely modified according to
a desired shape of the polnt-tuft 5 of the instrument. For
example, in case that such front end opening portion takes a
triangular shap~, a rectangular shape or a elliptic shape, the
polnt-tuft 5 will be caused to -take a cross-sectional shape
similar to such front end opening portion of the bore 3.
Fig. ~ is a central cross-sectional view of the writing
brush employing the holder "A" shown in Fig. 1.
The point-tuft 5 held in the bore 3 of the holder "A"
is received in a front sha*t 6 of the writing brush together with
the holder "A", which front shaft 5 is threadably connected to a
front end of a main body 7 of the writing brush, so that the
point-tuft 5 ts deformably held to the front end of the writing
brush while maintaining a certain flat cross-sectional shape.
Ink received ln a reservoir 8 inside the main body 7 is fed to
the poin~-tufk 5 from an opening 9 of a rear end of the holder
"A" through a sultable valve mechanism.
A means for mounting the holder "A" on the instrument
2~ and a means for feeding the ink or palnt liquid to the point-tuft
5 may be constructed of conventional means normally employed in
the conventional writing or painting lnstrument.
Since the writing or painting instrument o~ the present
3~ invention is provided with the above novel construction of the
holder "A", lt is possible to easily shape up the point-tuft 5
lnto any desired shape, for example such as a flat rectangular
cross-sectional shape, while the holder "A" having such
construction may be very easily manufactured, and the grooves 4
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acting as air escaping means are also easily formed in the holder
"A".
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