Note: Descriptions are shown in the official language in which they were submitted.
ti5
The present invention relates to a brush-like writing
instrument (hereinafter referred to as writing instrument) which
ls suitable for writing or applying a liquid having higher vis-
cosity (hereinafter referred to as a specific liquid) such as ink
or paint mainly composed of a pigment, of large or heavy part-
lcles, ink or paint having higher viscosity, a quick-dry ink or
paint, a lubricating oil, adhesives or a cosmetic liquid.
Hitherto, since the specific liquid is viscous and/or
is liable to quick-drying due to solvents, the usual type of
writing instrument cannot be used without certain modifications
or improvements. That is, the specific liquid is liable to clog
in an ink passage, or at an opening end of the ink reservoir. It
is, therefore, neccssary to improve, for example, the flow of the
specific liquid for evaporation during storage and use thereof.
The present invention provides a writing instrument
which smoothly supplies a specific liquid to the top part of pen
or brush without clogging of the liquid flow during use.
The present invention also provides a writing instru-
ment which has a safeguard to prevent accidental movement of the
knocking part and supply of the specific liquid to the top part
of the instrument during transport, storing and handling thereof.
According to the first aspect of the present invention
there is provided a writing instrument for specific liquid which
has an air introducing passage for the required amount of air
from the exterior of the instrument by a sucking action of a
valve body/position. Suitably the air introducing passage com-
prises a clearance, a longitudinal groove, a lateral groove, an
annular groove, a cross groove, an ink conduit and ink outlets.
According to the second aspect of the present invention
there is provided a writing instrument for a specific liquid
which has a liquid passage for supplying the liquid at all times
-- 1 --
A
1 ~ 91 ~t,~i
from an ink reservoir to a brush point through a liquid supply
cylinder in which the liquid reservoir provided multiple llquld
passage holes longitudinally elongated and spaced apart from each
other, and the liquid supply cylinder located between the reser-
volr and a brush point, provides liquid outlets at a peripheralwall thereof, so that at least one of the holes and outlets may
always be aligned to let the llquid through. Suitably three lon-
gitudinally elongated liquid passage holes are provided.
According to a third aspect of the present invention
there is provided a writing instrument for a specific liquid com-
prising a liquid reservoir having a valve box/cylinder, a mouth
element and mouth piece member, in which a liquid reservoir is
connected with mouth element interposed with a packing havlng a
concave portion which forms a cavity adjacent to a wall surface
of the packing groove. Suitably the packing is in a doughnut-
like shape.
According to the fourth aspect of the present invention
there is provided a writing instrument for a specific liquid hav-
ing a cap over a brush point, said cap being adapted to detach
from the brush point and insert into a concave portlon of an
upper portion of a shaft sleeve so that a lower end of the cap
may be placed on an upper end of an lnk bottle or piston stem
thereby supplementlng knocklng movement.
In the accompanying drawings which illustrate an embod-
lment of the present invention, Fig.s 1-7 show the writing
instrument containing the specific liquid in a cartridge, and
Fig. 8 shows the writing instrument containing the specific
liquid in the body thereof, liquid being supplied to the top by
virtue of a piston means. In particular:
Fig. l is a longitudinal sectional view through the
brush-like writlng lnstrument of the present invention;
t;5
Fig. 2 is an exploded perspective view of the same;
Fig. 3 is a cross-sectional view taken along the line
A-~ of Fig. l;
Fig. 4 is a longitudinal view of the brush-like writing
instrument in a condition that a knocking operation thereof is
completed;
Fig. 5 is a longitudinal sectional view of the brush-
like writing instrument in a condition that the knocking opera-
tion is completely released; and
Fig. 6 is a longitudinal sectional view of the writing
instrument in a condltion that the knocking operation thereof is
stopped halfway.
Fig. 7 is a cross-sectional view taken along the line
B-B of Fig. l; and
Fig. 8 is a longitudinal sectional view of the writing
instrument which contalns specific liquid in the body thereof
according to the present invention.
In order to overcome above first drawbacks the writing
instrument according to the present invention, there is to pro-
vide several improvements for easily feeding the specific liquid
to the brush point as stated below. (l) The writing instrument
provides air-introducing passages which forcedly introduce air
from the exterior of the instrument so as to smoothly supply the
specific liquid from the storage part thereof to the top of the
brush point without causing the specific liquid at a passage in
the writing instrument. (2) The writing instrument also provides
a specific liquid passage which comprises longitudinally elon-
gated liquid passage holes and outlets in a peripheral wall ofcylinder, and the relative positions between the holes and out-
1~6,~1~t~`~
lets being so arranged that at least one of the holes and outletsmay be aligned to let the llquid through at any angle of rota-
tlon. ~3) The writing instrument further provides a sealing
means comprising a packing at the rear end of the piston rod or
openiny of the liquid bottle in order to seal an opening of the
llquid bottle or the passage hole in a position rod or stem. In
the packing a concave portion is provided so that a gap may be
formed when it is placed on the packing groove.
Furthermore, in the writing instrument according to the
present invention there is to provide a means for forcedly feed-
ing the specific liquid which has a safeguard against leaking of
the specific liquid from the writing instrument during storage,
shipping and use as stated below. (4) The writing instrument
provides a guard such as cap, to the brush point which is capable
of being removed and fixed into the rear concave end of the writ-
ing instrument, having sufficient length to be attached to the
top of the knocking part, which is located below the rear face of
the writing instrument, so that knocking part may be extended.
Thus, the brush point of the writing instrument is cov-
ered, for example, with the cap when it is not in use, and a
knocking to feed the specific liquid is not available since the
knocking point is not extended over the rear end of the instru-
ment. The cap is taken off from the top of the brush point whenthe writing instrument is in use, and is fixed to the concave
part of the rear end of the writing instrument so as to be used
for feeding the liquid.
The present invention is now explained in detail with
reference to the accompanying drawings, in which all four fea-
tures are present in the writing instrument.
In the embodiment of the present invention, a mouth-
piece member of a hard plastic material has a thick sleeve-like
portion 1 and a thin sleeve-like portion 2 integrally connected
?ti5
to the thick sleeve-like portion l through a first step portion
3. In an inner surface of the thin sleeve-like portion 2 of the
mouthpiece member 4, there are provided four cross-wise longitu-
dinal grooves 5 each of which extend from an upper edge of the
t,hln sleeve-like portion 2 to the vicinity of a lower edge of the
same. In the first step portion 3, there are provided four lat-
eral grooves 5' each of which extends from the longitudinal
groove 5 to the vicinity of an outer periphery of the first step
portion 3, in an inner periphery of which step portion 3 is pro-
vided an annular groove 6. A brush point of the writing instru-
ment is formed from a plurality of thermo-plastic filaments
bundled into a tuft and an upper end of the thus formed tuft is
melted to form a brush point 9 provided with a flange portion 8
at its upper and outer periphery as a mounting means thereof. A
thin diameter ink guide hole 7 having a reverse-conical shape is
also formed in a center portion of the brush point 9 so that the
ink guide hole 7 extends from an upper end of the brush point 9
to approximately a middle portion of the brush point 9. The thus
formed brush po,int 9 is dropped into the thin sleeve-like portion
2 of the mouthpiece member 4 so that its flange portion 8 is
inserted into the ann~lar groove 6 of the mouthpiece member 4.
Thereafter, a disc-like plate 10 of a hard plastic material and
having outer diameter of the same size as the inner diameter of
the thick sleeve-like portion l of the mouthpiece member 4, is
placed on the first step portlon 3 of the mouthpiece members 4.
In a central portion of the disc-like plate lO, there is provided
an ink passage hole 11 communicating with the ink guide hole 7 of
the brush point 9. In a lower surface of the disc-like plate 10,
there are provided an annular groove 12 having the ink passage
hole 11 as its center and a cross groove 13 which faces the lat-
eral grooves 5 of the mouthpiece member 4 after the disk-like
plate 10 ls installed, and which cross groove 13 is connected to
the annular groove 12 at its outer ends and to the ink passage
hole 11 at its center. In an upper surface of the disc-like
plate 10, there is integrally provided a short sleeve-like inser-
tion portion 14 which has the ink passage hole ll as its center.
-- 5
~ t;~
An ink conduit 16 of a hard plastic material is provided with aclosed upper end and an open lower end so that it acts also as a
valve stem or a piston rod. In opposite side walls of the upper
end portlon of the ink conduit 16, there are provided two ink
outlets 17. In a top surface of the upper end portion of the ink
conduit 16, an inserting projection 18 is integrally provided.
In an outer periphery of a lower end of the ink conduit 16, there
is integrally provided a seat portion 20 which has a reverse
dish-like shape and is provided with an outwardly extending
flange 19. The thus formed ink conduit 16 is dropped into the
thick sleeve-like portion 1 of the mouthpiece member 4 to seat
its seat portion 20 on the disc-like plate 10 so that a lower
portion of the ink conduit 16 is inserted into the sleeve-like
insertion portion 14 of the disc-like plate 10 so that its inner
hole 12 communicates with the ink passage hole 11 of the disc-
like plate 10. A shaft sleeve 24 of a thin metal tube is pro-
vided with a male screw thread 23 in an outer peripheral surface
of a lower portion thereof, both upper and lower ends of which
sleeve 24 are open. Thls shaft sleeve 24 is connected to the
mouthpiece member 4 through a threadable connection between the
male screw thread 23 and a female screw thread 25 provided in an
inner surface of the thick sleeve-like portion 1 of the latter,
so that a lower end edge 26 of the shaft sleeve 24 urges an upper
surface of the flange 19 of the ink conduit 16 to flxedly hold
the disc-like plate 10 and the ink conduit 16 in place so that
the brush point 9 is held so as to point downward by the disc-
like plate 10 and so that the ink conduit 16 is held to point
upwardly. In such a condition, a clearance is provided between
the outer peripheral surface of the brush point 9 and the inner
peripheral surface of the thin sleeve-like portion 2 of the
mouthpiece member 4. A pipe-like mouth element 29 of a plastic
material has a tapered small diameter and short length portion in
its front portion and a second step portion 28 in an inner
peripheral surface of its middle portion. In an upper surface of
the second step portion 28 of the mouth element 29, there is pro-
vided a packing groove 30 which is open radially and upwardly and
~ t;5
in which groove 30 is inserted a doughnut-like packing 31 having
a concave portion 33 which forms a cavity 32 adjacent to a wall
surface of the packing groove 30 when the packing 31 is inserted
into the packing groove 30. A valve box/cylinder 39 of a plastic
material is provided with an outwardly extending flange 35 in an
outer periphery ln the vicinity of a lower edge thereof, a valve
seat 36 in an inner peripheral surface of a middle portion
thereof, three longitudinally elongated ink passage holes 37 in a
peripheral wall of an upper half thereof, which holes 37 are
spaced apart from each other, and a guide hole 38 in a top wall
thereof, respectively. In this valve boxtcylinder 39 is inserted
a valve body/piston 42 which is provided with an insertion hole
40 in a center portion of its lower surface and a guide rod 41 in
its upper surface, respectively. The valve bodyJpiston 42 is in
slidable contact with an inner peripheral surface of an upper
half of the valve box/cylinder 39 in its outer peripheral surface
while guided by the guide hole 38 of the valve box/cylinder 39 in
its guide rod 41, to allow the valve body/piston 42 to move up
and down in the valve box/cylinder 39. A coil spring 43 is
20 mounted around the guide rod 41 of the valve body/piston 42 in
the valve box/cylinder 39 so that the coil spring 43 imparts an
upward force to each of the valve box/cylinder 39, the packing
31, the mouth element 29 and an ink bottle 45. At this time, the
valve box/cylinder 39 has been dropped in the mouth element 29
and seated on the second step portion 28 of the mouth element 29,
while the ink bottle 45 formed of a thin metal tube, provided
with a closed upper portion and a male screw thread 44 in an
outer peripheral surface of its open lower end portion and con-
tains, for example, a gold or silver color ink therein is con-
nected to the mouth member 29 through a threadable connectionbetween the male screw thread 44 of the ink bottle 45 and a
female screw thread 46 provided in an inner surface of the mouth
element 29 so that a lower end edge of the thus connected ink
bottle 45 urges an upper surface of the outwardly extending
flange 35 of the valve box/cylinder 39 to have a lower surface of
the valve box/cylinder 39 brought into firm contact with an upper
i5
surface of the packing 31 inserted in the packing groove 30 of
the upper surface of the second step portion 28 of the mouth
element 29. Further, the thus assembled ink bottle 45 iS inser-
ted into the shaft sleeve 24 so that the ink conduit 16 is inser-
ted lnto a lower opening of the mouth element 29 to have an outerperipheral surface of its middle portion brought into firm con-
tact with an inner peripheral surface of the packing 31 and to
have its inserting projection 18 inserted into the insertion hole
40 of the valve body/piston 42. Thereafter, a ring-like edge
reinforcing member 47 is fixedly inserted in the upper opening of
the shaft sleeve 24 to prevent the ink bottle 45 from being with-
drawn from the shaft sleeve 24. A cap 49 of a plastic material
for use in covering the brush point 9 has a size and shape to be
detachably inserted into the thin sleeve-like portion 2 of the
mouthpiece member 4 and the cap 49 can be detachably inserted
into the upper portion of the shaft sleeve 24. A tail plug 50
which is removed in use is firmly inserted into the upper end of
the shaft sleeve 24 so that an inner end of the tail plug 50
abuts against the upper end of the ink bottle 45.
Thus, in use, the user of the writing instrument first
removes the tail plug 50 and the cap 49 attached to the mouth-
piece member 4 from the writing instrument and then the thus
removed cap 49 is lnserted lnto a concave portion 51 in the upper
25 end of the shaft sleeve 24 so that a lower end of the cap 49 ls
placed on the upper end of the lnk bottle 45. When the cap 49 is
knocked downward by the user, all of the ink bottle 45, the valve
box/cylinder 39, the packing 31 and the mouth element 29 are
moved downward agalnst the upward force imparted to them by the
coll spring 4 3. At the beginning of such downward movement of
the cap 49, external air is introduced into a space under a lower
surface of the valve body/piston 42 by sucking action of the
valve body~piston 42 through the clearance 9', the longitudinal
grooves 5, the lateral grooves 5', the annular groove 12, the
cross groove 13, the ink conduit 16 and the ink outlets 17. When
such downward movement of the cap 49 is further continued, the
A
l~S~l~t.5
space under the lower surface of the valve body/piston 42 is fur-
ther increased in volume to finally communicate with the inner
space of the bottle 45 when the ink outlets 17 is brought into
open to the inner space of the ink bottle 45 above the valve seat
36, so that a part of the ink contained in the ink bottle 45 is
replaced wlth the thus introduced external air and flows downward
into the space under the lower surface of the valve body/piston
42 through the ink passage holes 37. When the knocking action of
the cap 49 mentioned above is resolved, all the ink bottle 45,
the valve box/cylinder 39, the packing 31 and the mouth element
29 are moved upwardly under the upward force imparted to them by
the coil spring 43. In such upward movement thereof, when the
lower end edge of the ink passage hole 37 is at the level of the
bottom surface of the valve body/piston 42, the tank in the space
under the valve body/piston 42 is transferred into the ink
conduit 16 through the ink outlets 17. Namely, when the knocking
operation and its releasing operation of the cap 49 are
alternately repeated, the ink contained in the bottle 45 is grad-
ually replaced with the external air to be fed to the brush point
9 through the ink conduit 16 and the ink guide hole 7 of the
brush point 9 so that the brush point 9 is wet with the thus fed
ink.
As described above, the upper half of the brush point 9
ls inserted into the thin sleeve-like port~on 2 of the mouthpiece
member 4 to have its upper flange portion 8 seated in the annular
groove 6 of the thin sleeve-like portion 2 of the mouthpiece mem-
ber 4, while the clearance is provided between two surfaces one
of which is the outer peripheral surface of a portion of the
brush point 9 which portion exists in the thin sleeve-like por-
tion 2 of the mouthpiece member 4 and the other of which two sur-
faces is the inner peripheral surface of the thin sleeve-like
portion 2 of the mouthpiece member 4, so that the brush point 9
is held bendable within the thin sleeve-like portion 2 of the
mouthpiece member 4.
g _
