JP2004082431A - Writing utensil - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an ink writing utensil which securely prevents ink from leaking from a pen point without being influenced by the working precision of the pen point when the writing utensil is not used in a retracted posture, in the ink writing utensil with the pen point retractable into the pen point. <P>SOLUTION: This knock-type writing utensil A is structured of a hollow barrel 1, a cylindrical refill 3 which is movably arranged, inside the barrel 1, in its longitudinal direction and internally filled with ink with the open rear end part, a tip 7 fitted to the apex of the refill 3 integrally together with the refill 3 and a knock cam mechanism 11 which moves the pen point 5 at the apex of the tip 7 between a use position where the pen point 5 is protruded from an opening part 10 at the apex of the barrel 1 and a storage position where the pen point 5 is stored inside the barrel 1 and fixes the pen point 5 at the described positions 1 in the way that it can be set free. In addition, a plug 13 is provided which is brought into contact under pressure with the opening part 19 at the rear end of the refill 3 and seals the opening part 19, when the pen point 5 is set at the storage position. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a writing instrument containing ink therein. More specifically, the present invention relates to a writing implement having a structure in which a pen tip protrudes from a tip opening portion of a shaft only when the writing implement is used, and can be stored inside the shaft when the writing implement is not used.
[0002]
[Prior art]
In a writing instrument that stores ink in an ink storage section inside the shaft and supplies ink to the pen tip from the ink storage section, ink leakage when not in use is a problem. An example of a configuration employed in a ballpoint pen to prevent this will be described. As shown in FIG. 5 which is a longitudinal sectional view, the configuration of the pen tip is a tip 67 having an ink flow path 71 through which ink can flow out along a central axis, a point 61 which is a freely rotatable sphere, and It consists of a compression spring 73. The tip of the tip 67 is narrowed down so that the inside diameter is smaller than the diameter of the point 61, and a locking portion 69 is formed. Further, the compression spring 73 is arranged so as to urge the point 61 toward the leading end exit side of the ink flow path 71 and abut on the locking portion 69. Therefore, when the ball-point pen is not used, the point 61 is pressed against the inside of the locking portion 69 by the compression spring 73, so that ink is prevented from leaking from between the locking portion 69 and the point 61. .
[0003]
[Problems to be solved by the invention]
However, in the case of the above configuration, high processing accuracy is required to completely prevent ink leakage, and if the processing accuracy of the engagement portion of the pen tip is insufficient, ink leakage occurs. In addition, when the ballpoint pen is dropped, the locking portion may be damaged by an impact, and there is a problem that the ink leaks from between the point and the locking portion.
[0004]
The present invention has been made in view of the above-described conventional problems, and has as its object to provide a writing instrument that can reliably prevent ink from leaking from the pen tip without being affected by the processing accuracy of the pen tip. I have.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, a writing instrument according to the present invention has a hollow shaft, and is disposed so as to be movable in the longitudinal direction of the shaft inside the shaft, ink is stored inside, and a rear end portion is opened. A cylindrical refill, a tip integrally attached to the refill at the tip of the refill, and a use position where the tip of the tip protrudes from the tip opening of the shaft. And a writing instrument having an operating mechanism that moves between a storage position stored in the shaft and that is releasably fixed to these positions, wherein the pen tip is at the storage position. A configuration is provided in which a plug is pressed against the rear end of the refill and seals the rear end.
[0006]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, specific embodiments of the present invention will be described with reference to the drawings, but the present invention is not limited to the following examples, and various modifications are possible within the scope of the invention described in the claims. Which are also included in the scope of the present invention. In the following, for convenience of explanation, in the drawings, the pen tip direction will be described as the front or front, the direction opposite to the pen tip as the rear, the axial direction as vertical, and the direction perpendicular to the axial direction as horizontal. Does not limit the present invention at all.
[0007]
1 and 2 are overall longitudinal sectional views of a knock-type writing instrument A according to a specific embodiment of the present invention. FIG. 1 shows a state in which a pen tip is housed and fixed in a shaft. Reference numeral 2 denotes a state in which the pen tip projects from the tip of the shaft and is fixed.
[0008]
1 and 2 is a cylindrical refill 3 having a cylindrical shaft 1 having a narrowed tip and an ink storage portion 4 which extends in the shaft 1 in a vertical direction and stores ink. And The rear end of the refill 3 is an open opening 19. A known tip 7 is fixed to the tip of the refill 3, and a known tip 7 is inserted into and removed from the rear end of the shaft 1 through a shaft tip opening 10 which is an opening of the tip of the shaft 1. A knock bar 15 which comprises a knock bar front portion 15a and a knock bar rear portion 15b, which constitute the knock cam mechanism 11, is provided.
[0009]
The chip 7 has a thin hole (not shown) serving as a flow path for ink, as is well known, inside the tip 7. The tip of the tip 5 has a spherical point (also shown in the figure). ) Are rotatable and are arranged so as to be prevented from falling off. A spring 9, which is a compression coil spring, is arranged so as to surround the outer periphery of the chip 7, and one end of the spring 9 is received by the inner flange 2 projecting inward from the shaft 1 at a position slightly away from the tip of the shaft 1. The other end is in contact with the tip of the refill 3 to urge the refill 3 rearward.
[0010]
Reference numeral 11, although not shown in detail, presses the rear end of the knock bar 15 so that the pen tip 5 projects from the shaft tip opening 10 of the shaft 1 to be positioned and fixed. 1 shows a known knock-type cam mechanism 11 that can be used. The stopper 13 is fixed to the tip of the knock bar 15. An inner flange 25 projecting inward is formed at a position slightly away from the rear end of the shaft 1, an outer flange 27 is formed at an intermediate position of the knock bar 15, and a rear spring 17 which is a compression coil spring is formed. The two ends are received by them, and are attached so as to surround the front portion 15a of the knock bar 15. The rear spring 17 urges the knock bar 15 rearward, and the knock bar 15 is stopped by a stopper member 29 fixed to the rear end of the shaft 1.
[0011]
The aforementioned plug 13 forms a right circular cylinder having a height smaller than the diameter, and the diameter is longer than the diameter of the outer periphery of the opening 19 of the refill 3. The plug 13 is formed of a material that does not allow ventilation of outside air, and in this embodiment, is formed of rubber, which is an elastic body, but is not limited to an elastic body.
[0012]
The knock-type writing instrument A configured as described above operates as follows. In FIG. 1, the pen tip 5 at the tip of the tip 7 is housed inside the shaft 1 and is in the non-use position. The spring 9 and the rear spring 17 are in an extended state. At this time, the refill 3 is pushed rearward by the spring 9, and the opening 19 at the rear end of the refill 3 is pressed against the plug 13 fixed to the tip of the knock bar 15 to be sealed. Therefore, air cannot enter the ink storage portion 4 of the refill 3 from the opening portion 19, and the leakage of ink from the pen tip 5 is prevented.
[0013]
Next, by pushing the rear end of the knock bar 15, the plug 13 fixed to the tip of the knock bar 15 moves the refill 3 pressed against the plug 13 forward. Then, the refill 3 is moved forward by the known knocking cam mechanism 11 and is positioned and fixed at the use position. At this time, the spring 9 and the rear spring 17 are in a contracted state. In addition, the pen tip 5 is in a state of protruding from the shaft tip opening 10 of the shaft 1. When the knock bar 15 is released, the action of the rear spring 17 causes the knock bar 15 and the plug 13 to return to the positions before being pushed. FIG. 2 is a cross-sectional view of the knock-type writing instrument A showing the state at this time. Here, the opening 19 of the refill 3 and the plug 13 are located at a distance from each other, and since the opening 19 is open, air can enter the ink storage unit 4 and ink can be discharged from the pen tip. Become.
[0014]
Next, when the rear portion of the knock bar 15 is pushed again in the state of FIG. 2, the refill 3 is released from the use position by the action of the knock cam mechanism 11, and the refill 3 moves rearward by the force of the spring 9. It is positioned and fixed at the use position. Then, the opening 19 of the refill 3 is pressed against the plug 13 fixed to the tip of the knock bar 15 to be sealed (see FIG. 1). Therefore, air cannot enter the ink storage section 4 of the refill 3 from the opening 19, and ink leakage from the pen tip is prevented.
[0015]
3 and 4 are overall longitudinal sectional views of a rotary writing instrument B according to a specific embodiment of the present invention. FIG. 3 shows a state where the pen tip is housed and fixed in a shaft. Reference numeral 4 denotes a state in which the pen tip projects from the tip of the shaft and is fixed.
[0016]
The rotary writing instrument B in FIGS. 3 and 4 has a cylindrical shaft 31 with a narrowed tip, and a cylindrical refill 33 having an ink storage portion 34 that extends vertically in the shaft 31 and stores ink. And The rear end of the refill 33 is an open opening 49. A known tip 37 is fixed to the tip of the refill 33, and a known tip 37 is inserted into and removed from the rear end of the shaft 31 through a shaft tip opening 40, which is an opening at the tip of the shaft 31. A grip portion 51 constituting the rotary cam mechanism 41 is provided.
[0017]
Note that the tip 37, the pen tip 35, and the spring 39 are the same as the tip 7, the pen tip 5, and the spring 9 described above, respectively, and a description thereof will be omitted.
[0018]
Reference numeral 41 is not shown in detail, but by rotating the grip portion 51 in one direction, the pen tip 35 is projected and protruded from the shaft tip opening 40 at the tip of the shaft 31 to fix and fix the position. A known rotary cam mechanism 41 that can be positioned and fixed by being moved is shown. The plug 43 is received and fixed in a recess 51 a formed at the tip of the grip portion 51.
[0019]
An inclined cam 45 is formed at the tip of the grip portion 51, and a slider 47 that engages with the inclined cam 45 and moves back and forth in the axial direction is provided. The slider 47 has a cylindrical shape, and the rear end of the refill 33 is fitted inside the cylinder. The slider 47 is movable back and forth along a guide 53 extending in the longitudinal direction within the shaft 31 without rotating.
[0020]
The above-described plug 43 forms a right circular column having a height smaller than the diameter, and the diameter is longer than the diameter of the outer periphery of the opening 49 of the refill 33. Further, the plug 43 is formed of a material that does not allow ventilation of outside air, and in this embodiment, is formed of rubber which is an elastic body, but is not limited to the elastic body.
[0021]
The rotary writing implement B configured as described above functions as follows. In FIG. 3, the pen point 35 at the tip of the tip 37 is housed inside the shaft 31 and is in the non-use position. The spring 39 is in an extended state. At this time, the refill 33 is pushed rearward by the spring 39, and the opening 49 at the rear end of the refill 33 is pressed against the stopper 43 fixed to the tip of the grip 51. Therefore, since the refill 33 is in a sealed state, air cannot enter the ink storage portion 34 of the refill 33 from the open portion 49, and ink leakage from the pen tip 35 is prevented.
[0022]
Next, by manually rotating the grip portion 51 in one direction, the slider 47 moves forward by the action of the tilt cam 45 and is fixed at the front position. The refill 33 fitted and integrated with the slider 47 also moves forward and is positioned and fixed at the use position. At this time, the spring 39 is in a contracted state. FIG. 4 is a sectional view of the rotary writing instrument B showing the state at this time. Here, the opening 49 of the refill 33 is located at a position away from the plug 43 and the opening 49 is open, so that air enters the ink storage unit 34 and ink may come out of the pen tip. It becomes possible.
[0023]
Next, in the state of FIG. 4, when the grip portion 51 is rotated in the opposite direction to the above-described direction, the slider 47 moves rearward due to the operation of the rotary cam mechanism 41 and the force of the spring 39, and moves in the rear position. Fixed. The refill 33 fitted and integrated with the slider 47 is also released from the use position and moves rearward, and is positioned and fixed at the non-use position. The opening 49 of the refill 33 is pressed against the stopper 43 fixed to the tip of the grip 51 (see FIG. 3). Therefore, air cannot enter the inside of the refill 33 from the opening 49, and ink leakage from the pen tip is prevented.
[0024]
In the above description, a ballpoint pen has been described as an example, but the present invention is not limited to this. For example, the present invention can be applied to other writing instruments such as a marking pen and a felt-tip pen.
[0025]
【The invention's effect】
As is apparent from the above description, in the present invention, the plug comes into pressure contact with the opening of the refill only when the pen tip is housed and fixed inside the shaft. Therefore, the ink storage portion of the refill is sealed. Therefore, air cannot enter the refill and, therefore, does not leak from the pen tip. In a state where the pen tip protrudes from the shaft tip opening, the opening at the rear end of the refill is opened, and air enters the ink storage part, so that ink comes out from the pen tip. Therefore, there is no trouble in writing.
[Brief description of the drawings]
FIG. 1 is an overall longitudinal sectional view of a knock-type writing instrument A according to a specific embodiment of the present invention in a state where a pen tip 5 is stored and fixed.
FIG. 2 is an overall vertical cross-sectional view of a knock-type writing instrument A according to a specific embodiment of the present invention in a state where a pen tip 5 is projected and fixed.
FIG. 3 is an overall longitudinal sectional view of a rotary writing instrument B according to a specific embodiment of the present invention in a state where a pen tip 35 is stored and fixed.
FIG. 4 is an overall vertical cross-sectional view of a rotary writing implement B according to a specific embodiment of the present invention, with a pen tip 35 protruding and fixed.
FIG. 5 is a longitudinal sectional view of a known pen tip 70.
[Explanation of symbols]
A Knock-type writing instrument B Rotary-type writing instrument 1, 31 Shaft 2, 25, 32 Inner flange 3, 33 Refill 4, 34 Ink storage part 5, 35, 70 Nib 7, 37, 67 Tip 9, 39 Spring 10, 40 Shaft tip opening 11 Knock-type cam mechanism 13, 43 Plug 15 Knock rod 15 a Knock rod front 15 b Knock rod rear 17 Rear spring 19, 49 Openings 21, 61, 69 Points 23, 63, 69 Locking part 27 Outside Flange 29 retaining member 41 rotary cam mechanism 45 inclined cam 47 slider 51a recess 53 guide 71 ink flow path 73 compression spring

Claims (1)

A hollow shaft, a tubular refill arranged inside the shaft so as to be movable in the longitudinal direction of the shaft, containing ink therein, and having an open rear end; and a refill at a tip end of the refill. A tip that is integrally mounted with the tip, a tip position of the tip between a use position where the tip of the tip protrudes from the tip end opening of the shaft, and a storage position where the tip is stored in the shaft. And a writing implement having an operating mechanism for releasably fixing the pen tip to the rear end of the refill when the pen point is in the storage position, and sealing the rear end. A writing instrument comprising a stopper for stopping.

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