Coating implements with material supply – Including ball – roller or endless-belt tool – Ball
Reexamination Certificate
2002-01-14
2003-06-24
Huson, Gregory (Department: 3751)
Coating implements with material supply
Including ball, roller or endless-belt tool
Ball
C401S224000, C401S227000, C401S229000
Reexamination Certificate
active
06582144
ABSTRACT:
TECHNICAL FIELD
The present invention relates to a writing implement of a direct liquid type such as a ballpoint pen, a felt-tip pen or the like, further particularly to a writing implement having a temporary ink reserve part, between a tip and the ink tank, for adjusting a variation in pressure inside an ink tank.
BACKGROUND OF THE INVENTION
Conventionally, there has been provided a writing implement such as a ballpoint pen having a collector forming a temporary ink reserve part, between a tip and an ink tank, for adjusting a variation in pressure inside the ink tank.
An explanation will be given to a conventional writing implement of this kind in reference to an illustrated example.
FIG. 10
is a sectional side view of essential portions of a conventional ballpoint pen and
FIG. 11
is a sectional side view of a collector.
Around an outer periphery of the collector
100
, there are provided ink guide grooves
130
deposited from an ink tank
120
toward a tip
110
forming a writing end, air grooves
140
deposited from the tip
110
to the ink tank
120
so as not to intersect with the ink guide grooves
130
, and a number of temporary ink reserve grooves
150
formed to intersect with the ink guide grooves
130
and the air grooves
140
. A temporary ink reserve part is formed by the ink guide grooves
130
, the air grooves
140
, and the temporary ink reserve grooves
150
.
Further, at a center of the collector
100
there is provided an ink guide hole
160
penetrated from an end portion of the ink tank
120
to an end portion of the tip
110
. Further, the ink guide hole
160
is inserted with an ink guide core
161
to guide ink from the ink tank
120
to the tip
110
.
Further, the collector
100
is provided with a number of fins
170
provided to narrow intervals therebetween. Further, the temporary ink reserve groove
150
is formed by gaps between the fins
170
. Further, the ink guide grooves
130
and the air grooves
140
are formed to penetrate the fins
170
.
A further explanation will be given to the collector
100
as follows.
The temporary ink reserve groove
150
is formed by the gaps of a number of the fins
170
provided by the collector
100
.
Further, the ink guide groove
130
is formed to penetrate a number of the fins
170
from the ink tank
120
to the tip
110
, and communicates with the temporary ink reserve groove
150
and the ink tank
120
. Further, at an end portion of the ink guide groove
130
on the side of the tip
110
, there is provided a tip-side projecting portion
180
, and by the tip-side projecting portion
180
, the ink guide grooves
130
are prevented from directly communicating with outside of the ballpoint pen. Further, a rear end position of the collector
100
where the ink guide grooves
130
open to the ink tank
120
is made to constitute an air exchanging portion
135
where open airflows into the ink tank
120
. Further, a width of the ink guide groove
130
is formed to be narrower than a width of the temporary ink reserve groove
150
.
Further, the air groove
140
is formed to penetrate a number of the fins
170
from the tip
110
to the ink tank
120
, and communicates with the temporary ink reserve groove
150
and outside of the ballpoint pen. Further, at an end portion of the air groove
140
near the ink tank
120
, there is provided an ink-tank-side projecting portion
190
, and by the ink-tank-side projecting portion
190
, the air groove
140
is prevented from directly communicating with the ink tank
120
. Further, a width of the air groove
140
is formed to be wider than a width of the temporary ink reserve groove
150
.
Next, an explanation will be given to a function or the like of the collector
100
.
The ink inside the ink tank
120
is normally guided to the tip
110
by the capillary force of the ink guide core
161
inserted into the ink guide hole
160
.
Further, when the pressure inside the ink tank
120
increases relatively to the atmospheric pressure by a rise of temperature of ink or the like inside the ink tank
120
or by a variation in the atmospheric pressure, the ink inside the ink tank
120
is conducted through the ink guide groove
130
and reaches the temporary ink reserve groove
150
. Therefore, even when the pressure inside the ink tank
120
increases relatively to the atmospheric pressure by the variation in the pressure inside the ink tank
120
, the ink does not leak out from a front end of the tip
110
.
Further, when the pressure inside the ink tank
120
reduces relatively to the atmospheric pressure by consuming the ink inside the ink tank
120
, by temperature fall of ink or the like inside the ink tank
120
, or by the variation in the atmospheric pressure, the ink inside the temporary ink reserve groove
150
is conducted through the ink guide groove
130
and flows into the ink tank
120
to increase pressure inside the ink tank
120
. Therefore, even when the pressure inside the ink tank
120
reduces relatively to the atmospheric pressure by the variation in the pressure inside the ink tank
120
, the ink soaked in the ink guide core
160
cannot be drawn into the ink tank
120
.
Further, when the pressure inside the ink tank
120
reduces and an amount of ink inside the temporary ink reserve groove
150
is very little, the air outside the ballpoint pen is conducted through the air grooves
140
, the temporary ink reserve grooves
150
and the ink guide grooves
130
, flowing from the air exchanging portion
135
into the ink tank
120
to increase the pressure inside the ink tank
120
. Therefore, even when the pressure inside the ink tank
120
is reduced, the ink soaked in the ink guide core
161
cannot be drawn into the ink tank
120
.
In this way, the collector
100
achieves a function of stably supplying ink from the ink tank
120
to the tip
110
by adjusting a variation in pressure inside the ink tank
120
.
Meanwhile, when a total length of the above-described collector is extended, a capability of adjusting with regard to the variation in pressure inside the ink tank can be promoted. However, on the other hand, a distance from the front end of the tip to a rear end of the ink guide groove
130
is prolonged, and, when the front end of the writing implement is directed downwardly, head pressure applied to the front end of the tip is increased. Therefore, there poses a problem that the constitution operates adversely to leaking out of ink from the front end of the tip.
Conversely, when the total length of the collector is shortened, although ink can be prevented from leaking out from the front end of the tip, there poses, on the other hand, a problem that the capability of adjusting with regard to the variation in pressure inside the ink tank is reduced.
Therefore, there has been requested a writing implement of a direct liquid type in which, even when a total length of the collector is extended, the ink is not leaked out from a front end of a tip.
Hence it is an object of the invention described in claim
1
to provide a writing implement capable of preventing a pressure adjusting function from reducing while reducing head pressure applied to an ink guide core by disposing an air exchanging portion to a writing end rather than a position of a rear end of a temporary ink reserve part.
It is also an object of the invention described in claim 1 to provide a writing implement in which air is not hampered from flowing into an ink tank, and an ink solution communicates excellently with a temporary ink reserve part and which is provided with prompt response performance in adjusting pressure inside the ink tank.
Further, it is an object of the invention described in claim 1 to provide a writing implement for forming always stable head pressure by disposing the air exchanging portion always at a constant position and disposing the air exchanging portion firmly to a side of the writing end rather than the rear end portion of the temporary ink reserve groove.
Further, it is an object of the invention described in claim 4 to provide a writing implement forming
Kobayashi Takeshi
Matsumoto Kazuaki
Mutou Hiroyuki
Huson Gregory
Kubovcik & Kubovcik
Mitsubishi Pencil Kabushikikaisha
Prunner Kathleen J.
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