JPH0216238B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] This invention relates to an improvement in a capsule-press type writing instrument.

[Conventional technology]

Conventionally, in a cat press type writing instrument, a lid piece that can be opened and closed is provided at the tip of the barrel where the pen tip goes in and out, and this lid piece is opened and closed in conjunction with the advancing and retracting operation of the pen tip to open and close the tip of the barrel. It has been proposed to be configured to seal.

[Problem to be solved by the invention]

However, in the above conventional writing instruments,
There are problems in that the opening/closing mechanism of the lid piece is complicated and failures are likely to occur, a reliable seal cannot be expected, the ink tends to evaporate when not in use, and the useful life of the writing instrument is short.

The present invention has been made to solve the above-mentioned conventional problems, and has a simple configuration that enables reliable sealing, prolongs the useful life of cartridges, etc. containing ink, and The purpose of the present invention is to provide a cat press type writing instrument that is less likely to malfunction.

[Means to solve the problem]

The first gist of the present invention is a cartridge press type writing instrument in which a cartridge having a pen tip is housed in a barrel so as to move forward and backward, and the pen tip moves in and out from the tip of the barrel according to the advance and retreat operations. A sealing magnetic fluid is loaded into the passage, and permanent magnet pieces are arranged around the magnetic fluid.

Further, the second gist of the invention is that a cartridge having a pen tip is housed in the barrel so as to be freely advanced and retracted;
In a cap press type writing instrument in which the pen tip moves in and out from the tip of the barrel by clicking the extrusion member, a magnetic fluid for sealing is loaded into the pen nib entrance/exit passage, and a permanent magnet piece is arranged around the magnetic fluid. In addition, a magnetic fluid for sealing is also loaded into the insertion passage of the push-out member formed at the rear end of the shaft cylinder, and permanent magnet pieces are arranged around the magnetic fluid.

Further, the third gist of the present invention is that a cartridge having a pen tip is housed in the barrel so as to be freely advanced and retracted;
In a cat press type writing instrument in which the pen tip moves in and out of the tip of the barrel according to the movement of the pen, a sealing magnetic fluid is loaded into the pen tip entry/exit passage, and a permanent magnet piece is arranged around the magnetic fluid. ,
A recessed portion provided with advancing and retreating means for advancing and retracting the permanent magnet piece in response to the advancing and retreating operations of the cartridge, and having a passage cross-sectional area enlarged in a portion corresponding to the forward position of the permanent magnet piece in the entrance/exit passage of the pen tip. At the same time, when the magnet piece advances, the magnetic fluid is accommodated in the recess, and an opening for retracting the pen tip is formed in the center thereof, and when the magnet piece moves backward, the magnetic fluid is accommodated in the recess. The magnetic fluid is arranged so as to be led out of the recess and close the opening.

[Effect]

According to the configuration described in the first summary above, when the writing instrument is used, the pen tip penetrates the magnetic fluid and becomes ready for writing, and when the writing instrument is not used,
The passage in and out of the pen tip is sealed by the magnetic fluid.

Further, according to the configuration described in the second gist above, when the writing instrument is used, the pen tip penetrates the magnetic fluid and becomes ready for writing, and when the writing instrument is not used, the pen tip entrance/exit passage is made of the magnetic fluid. In addition to being sealed by the fluid, a seal is also provided by the magnetic fluid between the extrusion member that advances and retreats the cartridge and the insertion passage formed at the rear end of the barrel.

Further, according to the configuration described in the third gist, when the pen tip and the permanent magnet piece move forward in response to the advancing and retreating operations of the cartridge, the magnetic fluid loaded in the entrance/exit passage of the pen tip is accommodated in the recess. An opening is formed in the center of the magnetic fluid, and the pen tip is inserted through this opening to enable writing. Further, when the pen tip and the permanent magnet piece retreat in accordance with the retracting operation of the cartridge, the magnetic fluid is drawn out from the recess, the opening is closed, and the passage in and out of the pen tip is sealed by the magnetic fluid. It turns out.

〔Example〕

1 and 2 show an embodiment of a cartridge-type writing implement according to the present invention, in which 1 is a barrel, and 2 is a cartridge having a pen tip 21, and this cartridge 2 can be moved back and forth into the barrel 1. is housed in. The cartridge 2 is biased rearward by a compression spring 3 fitted inside the front part of the barrel 1, and in response to a knock operation of a push-out member 4 provided at the rear end of the barrel 1. The pen tip is configured so that it enters and exits through a pen tip entry/exit passage 11 formed at the tip of the barrel 1. A ring-shaped permanent magnet piece 5 is fixed to the pen nib entrance/exit passage 11, and a magnetic fluid 6 is charged on the inner surface of the permanent magnet piece 5. The magnetic fluid 6 is a colloidal solution in which colloid-sized ferromagnetic powder such as magnetite is dispersed in a stable state in a non-volatile or non-volatile solvent such as polyphenyl ether, alkylnaphthalene, phosphate ester, etc. This solution itself apparently behaves as if it were magnetic. The magnetic fluid 6 is held at the tip of the barrel 1 by the magnetic force of the magnet piece 5, and seals the pen tip entrance/exit passage 11.

Further, the insertion passage for the extrusion member 4 formed at the rear end of the shaft cylinder 1 may be sealed with a conventional sealing mechanism such as a rubber seal, but in this embodiment, a permanent magnet is attached to the inner surface of the insertion passage. While the piece 50 is fixed, a magnetic fluid 60 is loaded onto the inner surface of the magnet piece 50, thereby sealing the insertion passage.

In the above configuration, when the writing instrument is not in use, the pen tip 21 is attached to the barrel 1 as shown in FIG.
The pen tip entrance/exit passage 11 is accommodated in the magnetic fluid 6.
Since the cartridge is sealed by
is completely isolated from the outside air. Therefore, evaporation of the ink within the cartridge 2 is reliably prevented.
In addition, when using the writing instrument, by knocking the push-out member 4, the cartridge 2 is advanced and the pen tip 21 penetrates the magnetic fluid 6, as shown in FIG. The pen tip 21 is made to protrude from. The resistance when the pen tip 21 penetrates the magnetic fluid 6 is extremely small because the magnetic fluid 6 is made of liquid, and the above-mentioned forward and backward operations can be performed with a very light force. The magnetic fluid 6 through which the pen tip 21 has penetrated in this manner is held at the tip of the barrel 1 by the magnetic force of the magnet piece 5, while surrounding the pen tip 21. In addition,
The push-out member 4 is configured to be locked in the state shown in FIG. 1 and the state shown in FIG. 2 each time the push-out member 4 is moved forward or backward by being knocked, and since this mechanism is well known, a detailed explanation will be omitted. .

When the insertion passage of the push-out member 4 is sealed with the magnetic fluid 60 as described above, this part is reliably sealed in the same manner as the pen tip entrance/exit passage 11, and the knocking operation can be performed with a lighter force. It has the advantage of being able to

Note that it is desirable that the outer surface of the pen tip 21 be formed to be smooth so that magnetic fluid is less likely to adhere thereto. Further, the magnet piece 5 does not necessarily need to be formed as a single ring-shaped piece, and a plurality of divided magnet pieces may be arranged around the pen tip entrance/exit passage 11. In this case, the magnet piece 5 The inner surface of the piece may be covered with a ring member made of a magnetic material such as an iron plate, and the magnetic fluid 60 may be loaded into the inner surface of this ring member.

3 and 4 show a second embodiment of the cartridge press type writing instrument according to the present invention, in which a cartridge 2 is held in the barrel 1 while being accommodated in the inner barrel 7. FIG. A tip plug 8 serving as a pen tip entry/exit passage is fixed to the inner surface of the tip end of the barrel 1, and a sliding tube 9 is fitted onto the tip plug 8. The inner cylinder 7 has a flange 71 formed at its rear end, a stopper 72 and a protrusion 73 on its inner surface, and is biased rearward by a compression spring 31 that presses the flange 71. .

A stopper 81 is provided on the outer surface of the rear end of the tip plug 8.
A step 82 is formed near the center on the inner surface of the tip plug 8, and a recess 83 with an enlarged passage cross-sectional area is formed in front of the step 82. The tip end of the tip plug 8 is fixed to the inner surface of the tip end of the shaft tube 1. Further, the sliding tube 9 has a stopper 91 and a projection 92 corresponding to the projection 73 of the inner cylinder 7 formed on the outer surface of the rear end thereof, and a stepped portion 93 formed on the inner surface of the central portion.
A permanent magnet piece 5 that holds the magnetic fluid 6 is fixed to the inner surface of the tip. And the inner cylinder 7
and the sliding tube 9, the cartridge 2, which will be described later.
An advancing/retracting means for advancing and retracting the permanent magnet piece 5 according to the advancing/retracting operation of the permanent magnet piece 5 is constructed. Also,
A compression spring 32 is disposed on the rear outer surface of the inner cylinder 7 to bias the inner cylinder 7 rearward. Further, the insertion passage for the push-out member 4 formed at the rear end of the shaft cylinder 1 is sealed by a permanent magnet piece 50 and a magnetic fluid 60 as in the first embodiment.

When using this writing instrument, the push-out member 4 provided at the rear of the barrel 1 is knocked, and the inner barrel 7 and cartridge 2 are moved forward. As the inner cylinder 7 and the cartridge 2 move forward, the protrusion 92 on the outer surface of the sliding tube 9 is pressed forward by the protrusion 73 on the outer surface of the inner tube 7, and the sliding tube 9 moves forward within a certain range, and the shaft tube 1 It comes into contact with the inner surface of the tip and stops. When the sliding tube 9 moves forward, the magnet piece 5 also moves forward, and the magnetic fluid 6 moves forward to form the concave portion 83 of the tip plug 8.
contained within. As the magnetic fluid 6 spreads outward, an opening is formed in the center of the magnetic fluid 6 through which the pen tip 21 advances and retreats.

When the push-out member 4 is further knocked, the protrusion 73 of the inner cylinder 7 climbs over the protrusion 92 of the sliding tube 9, and the inner cylinder 7 and the cart storage 2 move forward. Then, the pen tip 21 of the cartridge 2 passes through the opening of the magnetic fluid 6 and protrudes from the tip of the barrel 1, resulting in the state shown in FIG. 4. In this case, with the proximal end of the nib 21 in contact with the stepped portion 82 of the nib 8 and the stopper 72 of the inner cylinder 7 in contact with the rear end surface of the sliding tube 9, the pushing member 4 is It is locked by an external locking mechanism.

Moreover, when the writing instrument is not in use, if the locking state of the push-out member 4 is released, the compression springs 31, 32
The inner cylinder 7 and the cartridge 2 move rearward due to the urging force, and the pen tip 21 is housed in the barrel 1. After the pen tip 21 passes through the opening of the magnetic fluid 6, the protrusion 92 or stopper 91 of the sliding tube 9 is pushed backward by the protrusion 73 of the inner cylinder 7, and the sliding tube 9 is moved back. As the sliding tube 9 retreats, the magnetic fluid 6 moves backward in the tip 8 and is led out of the recess 83, and as a result, it gathers toward the center and closes the opening, as shown in FIG. As shown in FIG. 2, a tip plug 8 disposed at the tip of the shaft cylinder 1 is sealed.

As described above, the pen tip 21 is advanced and retreated with the magnetic fluid 6 accommodated in the recess 83 of the tip stopper 8 and its center open, so that the pen tip 21 and the magnetic fluid 6 do not come into contact with each other. Therefore, there is no possibility that the magnetic fluid 6 will adhere to the pen tip and move.

Note that the magnetic force of the magnet piece 5 causes the magnetic fluid 6 to
In order to hold the tip stably in the tip plug 8,
It is desirable to form the magnetic material from a magnetic material such as iron. Further, the cartridge 2 and the inner cylinder 7 are connected together,
If these are configured to move forward and backward as one, the compression spring 32 that biases the cartridge 2 rearward can be omitted. Further, in the above embodiment, an example was explained in which the cartridge 2 is advanced or retreated by operating the push-out member 4, but the cartridge 2 may be advanced or retreated by rotating the shaft cylinder. .

〔Effect of the invention〕

As explained above, the present invention makes it possible to reliably seal the tip of the barrel with a simple configuration by sealing the nib entry/exit passage with magnetic fluid in a cat press type writing instrument. It has the advantage that evaporation is effectively prevented, the useful life of the writing instrument can be maintained for a long time, there are fewer failures, and the cartridge can be moved forward and backward with light force.

In addition, in a case of a cartridge type writing instrument in which the pen tip moves in and out according to the push-out member's knob operation, when the insertion passage of the push-out member formed at the rear end of the barrel is sealed with magnetic fluid, the above-mentioned insertion This has the advantage that the passage can be reliably sealed and the knock operation can be performed with less force.

In addition, the permanent magnet piece is moved forward and backward in accordance with the advance and retreat operations of the cartridge, and the magnetic fluid is advanced and retreated, so that when the magnet piece moves forward, the magnetic fluid is accommodated in the recess formed in the nib entrance/exit passage. In this way, when an opening is formed in the center of the magnetic fluid through which the pen tip advances and retreats, it is possible to prevent the pen tip from coming into contact with the magnetic fluid when the pen tip is moved in and out. This has the advantage of preventing the magnetic fluid from adhering to the pen tip and moving.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view showing a first embodiment of the capsule-press type writing instrument according to the present invention, FIG. 2 is a cross-sectional view showing the usage state of the writing instrument, and FIG. 3 is a second embodiment of the capsule-press type writing instrument according to the present invention. A cross-sectional view showing an example, and FIG. 4 is a cross-sectional view showing the usage state of this writing instrument. 1... Shaft tube, 2... Cartridge, 4... Extrusion member, 5, 50... Permanent magnet piece, 6, 60...
Magnetic fluid, 7... Inner cylinder (advancing/retracting means), 8... Tip plug (pen tip entry/exit passage), 9... Sliding tube (advancing/retracting means),
11... Pen nib entrance/exit passage, 21... Pen nib, 83
...Concavity.

Claims (1)

[Scope of Claims] 1. In a cartridge press type writing instrument in which a cartridge having a pen tip is housed in a barrel so as to be freely advanced and retracted, and the pen tip moves in and out from the tip of the barrel according to the movement of the cartridge, the cartridge has a pen tip in and out passage. A cap press type writing instrument, characterized in that a magnetic fluid for sealing is loaded and a permanent magnet piece is arranged around the magnetic fluid. 2. In a cartridge press type writing instrument in which a cartridge having a pen tip is housed in a barrel so as to be freely advanced and retractable, and the pen tip moves in and out from the tip of the barrel by operating a push-out member, a sealing part is provided in the pen nib entrance/exit passage. A magnetic fluid is loaded, a permanent magnet piece is arranged around the magnetic fluid, and a sealing magnetic fluid is also loaded into the insertion passage of the extrusion member formed at the rear end of the shaft cylinder. A cat press type writing instrument characterized by having a permanent magnet piece placed around the fluid. 3. In a cartridge press type writing instrument in which a cartridge having a pen tip is housed in a barrel so as to move forward and backward, and the pen tip moves in and out from the tip of the barrel according to the movement of the cartridge, a magnetic fluid for sealing is provided in the nib entrance/exit passage. A permanent magnet piece is provided around the magnetic fluid, and an advancing/retracting means is provided for advancing and retracting the permanent magnet piece in response to the advance/retreat operation of the cartridge, and a permanent magnet piece is provided in the entrance/exit passage of the pen tip. A recess with an enlarged passage cross-sectional area is formed in a portion corresponding to the forward position of the magnet piece, and a magnetic fluid is accommodated in the recess when the magnet piece moves forward, and an opening for advancing and retracting the pen is formed in the center of the recess. formed,
A cap press type writing instrument characterized in that the magnetic fluid is arranged so that the magnetic fluid is led out of the recess and the opening is closed in accordance with the retreating movement of the magnet piece.