TW202031520A - Ink inhaler - Google Patents

Abstract

To provide an ink inhaler that can promote the inflow of air into an ink container section and enables the smooth outflow of ink. This ink inhaler is provided with: a main cylinder that has a reduced diameter section on an inner surface and that defines an ink container section to the rear of the reduced diameter section; a piston member that is arranged in a movable manner in a forward and rearward direction with respect to the main cylinder; a pipe that extends inside the main cylinder through the inside of the reduced diameter section and is held in a movable manner in the forward and rearward direction with respect to the piston member; and a fixed piece member that is fixed to the pipe at the rear of the reduced diameter section, wherein the main cylinder has, on the inner surface in front of the reduced diameter section, a forward inclined surface that is inclined in the axial direction and in the radial direction, or has a forward rib section that extends within a plane that includes the center axis of the main cylinder.

Description

Ink inhaler

Invention field

The invention relates to an ink inhaler used for writing instruments such as fountain pens.

Background of the invention

Conventionally, in writing instruments such as fountain pens, an ink inhaler is used. The ink inhaler sucks ink into the interior to accommodate the ink, and supplies the ink to the nib when writing. The ink inhaler has an ink accommodating part and an ink suction mechanism that sucks ink in the conventional ink accommodating part.

The ink suction mechanism generally has a mechanism for generating a negative pressure in the ink inhaler, and sucking ink using the difference in air pressure between the inside and outside of the ink inhaler. The method of generating negative pressure in the ink inhaler includes, for example, a push-pull type, a rotary type, a push type, etc. The push-pull type is to linearly operate the operating member at the rear to move the piston member connected to the front of the operating member to the rear. This causes negative pressure in the ink inhaler; the aforementioned rotary type is to rotate the operating member around the axis to move the piston member screwed with the operating member toward the rear, thereby generating negative pressure in the ink inhaler; the aforementioned pressing type is The piston member provided at the rear of the ink inhaler is pushed forward and opened, thereby generating negative pressure in the ink inhaler. Especially in the press type ink inhaler, compared with the push-pull type or rotary type ink inhaler, the length of the operating member can be reduced. Thereby, the ink inhaler of the same capacity can be miniaturized, or the ink inhaler of the same size can be made larger.

An ink suction device is disclosed in JP2017-209863A, which is provided with: an ink containing tube having a reduced diameter portion (inner section) and an ink containing chamber, a piston member arranged at the rear of the ink containing tube, and arranged in the ink containing tube The tube inside the cylinder and held by the piston member, and the block fixed to the tube.

In the conventional press type ink inhaler, sometimes the outflow of ink from the ink containing portion (ink containing chamber) to the nib does not proceed smoothly. In view of this reason, the inventors of this case have carefully reviewed and found that the conventional push-type ink inhaler has the following problems.

When the ink advances and passes through the reduced-diameter part to the nib, the air replaces the ink flowing out from the ink-accommodating part and flows into the ink-accommodating part through the reduced-diameter part. However, at this time, the air does not properly flow into the ink accommodating portion, which will hinder the smooth flow of ink from the ink accommodating portion. Upon further review of this issue, it was found that the air going to the ink containing portion was stagnated in front of the reduced diameter portion, hindering the inflow of the air into the ink containing portion.

Summary of the invention

The present invention is made in consideration of such problems, and its purpose is to provide an ink inhaler that can promote the inflow of air into the ink containing portion and allow the ink to flow out smoothly.

The ink inhaler of the present invention includes: a main cylinder with a reduced diameter portion on the inner surface, and an ink containing portion is defined behind the reduced diameter portion; a piston member arranged to be movable forward and backward relative to the main cylinder; The reduced diameter portion extends inside the main cylinder and is held to be movable back and forth relative to the piston member; and a fixed block member is fixed to the pipe at the rear of the reduced diameter portion, and the main cylinder is in the reduced diameter portion The front inner surface has a front inclined surface inclined to the axial direction and the radial direction, or has a front rib extending in a plane including the central axis of the main cylinder.

In the ink inhaler of the present invention, the main cylinder may have the front inclined surface, and the front inclined surface may have a groove extending in a plane including the central axis of the main cylinder.

In the ink inhaler of the present invention, the main cylinder may have a plurality of grooves arranged in the circumferential direction.

In the ink inhaler of the present invention, the width of the groove in the circumferential direction may decrease toward the front.

In the ink inhaler of the present invention, the main cylinder may have the front rib, In a cross-section orthogonal to the center axis, the front rib has a corner portion that faces the center axis.

In the ink inhaler of the present invention, the main cylinder may have the front rib, In the front parallel portion parallel to the center axis of the inner surface, the front rib includes a portion where the distance from the center axis along the radial direction becomes smaller as it goes to the rear.

In the ink inhaler of the present invention, the main cylinder may have a plurality of the front ribs arranged in the circumferential direction.

In the ink inhaler of the present invention, the interval between two adjacent front ribs in the circumferential direction may be 2.7 mm or more.

In the ink inhaler of the present invention, the main cylinder may have a rear rib extending in a plane including the central axis of the main cylinder on the inner surface of the ink containing portion.

In the ink inhaler of the present invention, the main cylinder may have a plurality of the rear ribs arranged in the circumferential direction.

In the ink inhaler of the present invention, the interval between two adjacent rear ribs in the circumferential direction may be 2.7 mm or more. Invention effect

According to the present invention, it is possible to provide an ink inhaler which can promote the inflow of air into the ink accommodating portion and smooth out the ink.

Detailed description of the preferred embodiment Hereinafter, an embodiment of the present invention will be described with reference to the drawings. Furthermore, in the drawings attached to this specification, for the convenience of illustration and easy understanding, the actual components are appropriately changed and the scale and the aspect ratio are exaggerated.

In addition, terms such as "parallel", "orthogonal", "same", etc., or the value of length or angle of the specific shape or geometrical conditions used in this manual and the degree of such degree are not in strict sense. To limit it, but to include the scope to the extent that the same function can be expected.

Figures 1 to 10 are diagrams for explaining one embodiment of the present invention. Among them, FIG. 1 is a cross-section showing the writing instrument 10 installed in the ink inhaler 20, FIG. 2 shows the ink inhaler 20 enlarged, and FIG. 3 shows the ink inhaler with its operating member 60 pushed forward to display the ink A cross-sectional view of the inhaler 20. In this embodiment, an example in which the writing instrument 10 is a fountain pen is described, but the writing instrument 10 is not limited to a fountain pen. In this specification, the direction in which the central axis A of the main cylinder 30 of the ink inhaler 20 extends (the longitudinal direction) is taken as the axis direction, and the direction orthogonal to the central axis A is taken as the radial direction, so as to surround the central axis A. The circumferential direction of is the circumferential direction. In addition, in the writing tool 10 and the ink inhaler 20, along the axial direction, the side of the writing surface (such as the lower side in FIG. 1) that is close to the paper surface during writing is the front, and the side away from the writing surface (such as the figure) The upper side in 1) is the rear.

The writing instrument 10 shown in FIG. 1 includes: a shaft barrel 11; a pen tip 12; and a pen tip support portion 13 that is located in front of the shaft barrel 11 and supports the pen tip 12. The shaft cylinder 11 is a member having a longitudinal direction along the central axis A, and has a cavity opening toward the front inside. In this embodiment, at least a part of the ink inhaler 20 is placed in the cavity of the barrel 11. The pen tip 12 is a member that forms handwriting on the writing surface by the ink supplied from the ink inhaler 20. The pen point support portion 13 has an ink circulation hole 14 and an air circulation hole 15 inside. The ink circulation hole 14 communicates with the pen tip 12 and functions as a passage for guiding the ink supplied from the ink inhaler 20 to the pen tip 12. The air circulation hole 15 extends substantially along the axial direction and opens in the vicinity of the pen tip 12. The air circulation hole 15 functions as a passage for guiding the outside air flowing in from the opening to the ink inhaler 20. An attachment portion 16 to which the ink inhaler 20 is attached is formed on the nib support portion 13. In this embodiment, the mounting portion 16 is configured as a rearward protruding portion, and the front end portion of the ink inhaler 20 is externally fitted into the mounting portion 16, and the ink inhaler 20 is detachably mounted on the nib support portion 13. In addition, it is not limited to this, and the mounting portion 16 may be configured as a groove opening at the rear, and the front end of the ink inhaler 20 is press-fitted into the mounting portion 16, whereby the ink inhaler 20 is mounted on the nib support portion 13. A male screw part is formed on the outer surface of the rear part of the pen point support part 13, and a corresponding female screw part is formed on the front inner surface of the barrel 11. Next, the female screw portion of the barrel 11 is screwed to the male screw portion of the nib support portion 13, and the barrel 11 is attached to the nib support portion 13.

The ink inhaler 20 of this embodiment is a push-type ink inhaler, and has an ink accommodating portion 21 inside to accommodate ink supplied by a conventional pen tip 12. The ink inhaler 20 includes: a main cylinder 30 that delimits the ink containing portion 21, a piston member 50 arranged to be movable back and forth relative to the main cylinder 30, a tube 70 held to be movable back and forth relative to the piston member 50, and fixed to The fixed block member 80 of the pipe 70. In the example shown in the figure, the ink inhaler 20 further has: a tail tube 40 installed at the rear of the main tube 30, an operating member 60 installed at the rear of the piston member 50, and a tube 70 that is loosely fitted behind the fixed block member 80 The movable block member 90. Hereinafter, each member constituting the ink inhaler 20 of this embodiment will be described in order.

The main cylinder 30 is a member having a substantially cylindrical shape, and has an inner surface 30a and an outer surface 30b extending in the axial direction. The inner surface 30a has a reduced diameter portion 31 with a reduced inner diameter. The reduced diameter portion 31 is an annular protrusion formed on the inner surface 30a along the circumferential direction. In particular, the reduced-diameter portion 31 is a protrusion whose inner surface 30a protrudes toward the central axis A. The ink containing portion 21 is formed behind the reduced diameter portion 31. A rear inclined surface 31a facing the ink accommodating portion 21 and inclined to the axial and radial directions is formed behind the top of the reduced diameter portion 31 closest to the central axis A, and in front of the top, a counter axis is formed The front inclined surface 31b inclined in the direction and the radial direction. The rear inclined surface 31a is a surface that extends toward the outer side in the radial direction as it goes to the rear, and the front inclined surface 31b is a surface that extends toward the outer side in the radial direction as it goes to the front.

On the outer surface 30b of the main cylinder 30, an uneven portion 36 is provided. One example of the uneven portion 36 includes a convex portion and/or a concave portion extending in the circumferential direction. The concavo-convex portion 36 serves as an anti-slip function when attaching and detaching the ink inhaler 20 to the mounting portion 16 of the nib support portion 13. That is, the user can easily and stably perform attachment and detachment to the pen point support portion 13 by holding the uneven portion 36.

At the rear of the main tube 30, a tail tube 40 is installed. The tail tube 40 is used to accommodate at least a part of the operating member 60. In the rear end opening 42 of the transition piece 40, a flange portion 44 protruding inward is formed, and the flange portion 44 abuts against a convex portion 64 of the operating member 60 described later in the open state of the operating member 60. The flange portion 44 may be one protrusion provided along the circumferential direction including the entire circumference, or may be a plurality of protrusions arranged dispersedly in the circumferential direction.

The piston member 50 has a convex flange portion 51 and a connecting convex portion 55 provided behind the convex flange portion 51. The convex flange portion 51 is located inside the main cylinder 30, and the outermost end in the radial direction of the convex flange portion 51 contacts the inner surface 30 a of the main cylinder 30 in a liquid-tight manner. Thereby, the ink containing portion 21 is defined as a space surrounded by the inner surface 30 a of the main cylinder 30 and the reduced diameter portion 31 and the convex flange portion 51 of the piston member 50. The convex flange portion 51 has a concave portion 53 recessed rearward from the front end surface 51a. The connecting convex portion 55 functions as a connecting portion that connects the piston member 50 to the operating member 60. The connecting convex portion 55 is provided with a hole 57 that is open at the rear. The piston member 50 has a through hole 59 communicating the recess 53 and the hole 57 on the central axis A. The pipe 70 is inserted into the through hole 59. That is, the inner diameter of the through hole 59 is larger than the outer diameter of the main body of the pipe 70, whereby the pipe 70 is held to be movable back and forth relative to the piston member 50. The hole 57 serves as an introduction portion when the tube 70 is inserted into the through hole 59 and defines a movable range when the tube 70 moves back and forth relative to the piston member 50. Furthermore, in order to ensure the smooth flow of ink or air between the ink containing portion 21 and the hole 57, the through hole 59 may also have a cut portion cut in the radial direction.

The operating member 60 is a member operated by the user when the piston member 50 is restricted from moving back and forth and the piston member 50 is moved back and forth with respect to the main cylinder 30. The operating member 60 has an opening on the front end surface, and has a connecting recess 62 fitted with the connecting protrusion 55 of the piston member 50. In the example shown in the figure, an engaging concave portion is provided on the side surface of the connecting concave portion 62, and an engaging convex portion corresponding to the engaging concave portion of the connecting concave portion 62 is provided on the side surface of the connecting convex portion 55. Then, the connecting convex portion 55 is inserted into the connecting concave portion 62, and the engaging convex portion of the connecting convex portion 55 engages with the engaging concave portion of the connecting concave portion 62, whereby the piston member 50 is connected to the operating member 60. The connecting convex portion 55 of the piston member 50 is attached to the connecting concave portion 62 in a liquid-tight manner so that the ink flowing into the hole 57 does not leak to the outside. The outer peripheral surface of the operating member 60 is provided with a convex portion 64 protruding to the outside in the radial direction. Between the main cylinder 30 and the convex portion 64, a potential energy imparting member 25 is arranged. In the example shown in the figure, the potential energy applying member 25 is a coil spring, and is inserted between the rear end of the main cylinder 30 and the front end of the convex portion 64 in a compressed state in the axial direction. Thereby, the operating member 60 serves as a member that imparts potential energy toward the rear to the main cylinder 30. The convex portion 64 abuts against the flange portion 44 of the transition piece 40 from the front in the open state of the operating member 60 (a state not pushed forward by the user). Therefore, the rear end of the movable range of the operating member 60 is defined by the flange portion 44.

The tube 70 is configured to extend in the main cylinder 30 through the reduced diameter portion 31. In either the open state (refer to FIG. 2) and the pressed state (the state pushed forward by the user, refer to FIG. 3) of the operating member 60, the front end portion 72 of the tube 70 is located in front of the reduced diameter portion 31. At the rear end 74 of the pipe 70, an enlarged diameter portion 76 is formed in which the main body of the pipe 70 expands in the radial direction. The outer diameter of the enlarged diameter portion 76 is larger than the inner diameter of the through hole 59 of the piston member 50. Furthermore, the outer diameter of the part other than the enlarged diameter portion 76 of the pipe 70 is smaller than the inner diameter of the through hole 59. Therefore, the tube 70 can be moved in the front-rear direction while being inserted into the through hole 59, and the enlarged diameter portion 76 is locked to the through hole 59 from the rear, and is positioned most forward with respect to the piston member 50. The inside of the tube 70 is hollow. Through the tube 70, a part closer to the front than the reduced diameter portion 31 of the main cylinder 30 is in communication with the hole 57 of the piston member 50. The material forming the tube 70 is not particularly limited, but a metal material such as a stainless steel material can be used as an example.

The fixing block member 80 fixes the pipe 70 behind the reduced diameter portion 31. In more detail, the fixed block member 80 is fixed to the outer surface of the pipe 70 in the rear of the reduced diameter portion 31. The fixed block member 80 is formed of an elastic material. As an example of this elastic material, fluorine rubber can be used. The fixed block member 80 has a blocking surface 82 at the front. In the example shown in the figure, the blocking surface 82 includes a surface that is inclined in the axial direction and the radial direction at intervals from the pipe 70 in the radial direction as it goes to the rear. When the pipe 70 and the fixed block member 80 move forward, the closing surface 82 abuts on the rear inclined surface 31 a of the reduced diameter portion 31 to close the reduced diameter portion 31.

The movable block member 90 is freely fitted into the pipe 70 in the rear of the fixed block member 80. That is, the movable block member 90 can move in the front-rear direction along the pipe 70 behind the fixed block member 80. The movable block member 90 is formed in a cylindrical shape as a whole, and a pipe 70 is inserted therein. The material forming the movable block member 90 is not particularly limited, and a metal material such as stainless steel can be used as an example.

In the above-mentioned ink inhaler 20 in the open state as shown in FIG. 2, by applying the potential energy member 25, the operating member 60 is given potential energy toward the rear. The convex portion 64 provided on the outer peripheral surface of the operating member 60 abuts against the flange portion 44 provided at the rear end opening 42 of the tail tube 40 from the front, thereby restricting the operating member 60 from moving further rearward. At this time, the piston member 50 connected to the operating member 60, the pipe 70 held by the piston member 50, the fixed block member 80 fixed to the pipe 70, and the movable block member 90 freely fitted to the pipe 70 are also located behind.

When sucking ink into the ink accommodating portion 21 of the ink inhaler 20, prepare an ink bottle or the like that stores the ink. With the ink inhaler 20 mounted on the nib support portion 13, make the nib 12 facing downward, and place the nib The supporting portion 13 is immersed in the ink until the ink circulation hole 14 and the air circulation hole 15 are located below the liquid surface of the ink.

In the state where the operation member 60 is facing upward, when the operation member 60 is pushed forward (downward) by, for example, the user's finger, it becomes a pushed state as shown in FIG. 3. When turning from the open state to the pressed state, as the operating member 60 moves forward, the piston member 50, the pipe 70, the fixed block member 80, and the movable block member 90 also move forward. In this movement, first, the closing surface 82 of the fixed block member 80 abuts on the rear inclined surface 31 a of the reduced diameter portion 31 to close the reduced diameter portion 31. Thereby, the pipe 70, the fixed block member 80, and the movable block member 90 stop. Furthermore, when the operating member 60 moves forward, the piston member 50 further moves forward. At this time, the air compressed in the ink containing portion 21 passes through the gap between the through hole 59 of the piston member 50 and the pipe 70 and flows out from the front end 72 of the pipe 70 through the hole 57 and the cavity in the pipe 70. The air flowing out of the tube 70 is discharged to the outside via the pen point support portion 13. Furthermore, if the through hole 59 of the piston member 50 has a cut portion cut in the radial direction, the air flow between the ink containing portion 21 and the hole 57 can be sufficiently ensured, so that the ink can be contained quickly and stably Part 21 of the air discharge.

In this state, for example, by releasing the finger of the user who has pushed the operating member 60 forward to release the pushing force applied to the operating member 60, the force exerted by the potential energy member 25 is applied to operate The member 60 retreats rapidly. Following this, the piston member 50 also retreats rapidly, and the pressure in the ink containing portion 21 becomes negative pressure. When the operating member 60 and the piston member 50 are further retracted, the enlarged diameter portion 76 provided at the rear end 74 of the pipe 70 is locked in the through hole 59 of the piston member 50, the pipe 70, the fixed block member 80 and the movable block member 90 and the piston The member 50 retreats together. When the closing surface 82 of the fixed block member 80 is spaced from the rear inclined surface 31a of the reduced diameter portion 31, the ink in the ink bottle passes through the nib support portion 13 due to the pressure difference between the inside and the outside of the ink containing portion 21 The reduced diameter portion 31 flows into the ink containing portion 21.

By repeating this, the ink is sucked into the ink containing portion 21. Furthermore, when the operating member 60 is pushed forward in a state where there is ink in the ink containing portion 21, a small amount of ink flows out from the ink containing portion 21 through the reduced diameter portion 31, but by the fixing block member 80 After the reduced diameter portion 31 is closed, the ink does not flow out of the ink containing portion 21, and the air existing in the upper part of the ink containing portion 21 flows out through the tube 70. After the inhalation of the ink into the ink inhaler 20 is completed, the barrel 11 is attached to the nib support portion 13, so that the writing instrument 10 becomes a state capable of writing.

FIG. 4 shows a state where the ink inhaler 20 is arranged with the pen tip 12 facing upward. In this state, due to the action of gravity, the tube 70 moves to the rear and the rear end 74 abuts against the lowest part (the rearmost part) of the connecting recess 62 of the operating member 60. The fixed block member 80 is largely retracted from the reduced diameter portion 31, and the reduced diameter portion 31 is in a communicating (non-occluded) state. The movable block member 90 is located at the lowest portion (rearmost portion) of the ink containing portion 21 and abuts against the piston member 50. In this embodiment, the outer diameter D _{90B of the} movable block member 90 is smaller than the inner diameter D _53A of the recess 53 of the piston member 50. Therefore, the movable block member 90 enters the recess 53 and abuts on the lowest part (the rearmost part) of the recess 53.

The writing using the writing instrument 10 is usually performed with the pen tip 12 facing downward and the longitudinal direction of the writing instrument 10 is inclined to the vertical direction (the direction of gravity). At this time, the central axis A of the ink inhaler 20 is also inclined to the vertical direction. FIG. 5 shows a cross-sectional view of the ink inhaler 20 in a state where the central axis A is inclined to the vertical direction. During the transition of the ink inhaler 20 from the state shown in FIG. 4 to the state shown in FIG. 5, the fixed block member 80 moves to the front by the action of gravity, whereby the ink in the ink containing portion 21 shrinks toward The diameter portion 31 is pushed out.

Especially when the ink in the ink containing portion 21 is reduced, even if the ink inhaler 20 is switched from the state shown in FIG. 4 to the state shown in FIG. 5, the ink will stay in the ink container due to the effect of surface tension. When the rear part of the placement part 21 does not move forward. In this embodiment, since the ink inhaler 20 has a movable block member 90, the movable block member 90 moves from the rear end of the ink containing portion 21 to the front, and the ink staying at the rear of the ink containing portion 21 moves toward The front is pushed out. In particular, if the outer diameter D _{90B of the} movable block member 90 is smaller than the inner diameter D _53A of the concave portion 53 of the piston member 50, as the movable block member 90 moves forward, the ink remaining in the concave portion 53 will also move toward The front is pushed out.

In the writing state shown in FIG. 5, since the central axis A of the ink inhaler 20 is inclined to the vertical direction, the fixed block member 80 contacts the inner surface 30a of the main cylinder 30 by gravity. When writing, ink is continuously supplied to the pen tip 12 from the ink accommodating portion 21 through the reduced diameter portion 31 and the ink circulation hole 14. As the ink in the ink containing portion 21 decreases, the pressure in the ink containing portion 21 becomes negative pressure. Therefore, due to the pressure difference between the inside and the outside of the ink containing portion 21, external air flows into the ink containing portion 21 through the air circulation hole 15 and the reduced diameter portion 31. At this time, the ink relatively moves downward and forward, and the air moves upward and backward from the ink.

At this time, in the conventional push-type ink inhaler, air may not flow properly into the ink containing portion, which hinders the smooth flow of ink from the ink containing portion. When the inventors of this case reviewed this problem, they realized that the movable block member would hinder the inflow of air into the ink containing portion.

In this embodiment, the inner diameter D _90A of the movable block member 90 is 1.5 times or more and 3.5 times or less the outer diameter D _70B of the pipe 70. Since the inner diameter D _90A is 1.5 times or more of the outer diameter D _70B , the movable block member 90 can move substantially downward relative to the fixed block member 80. That is, the center axis of the movable block member 90 can be moved largely downward relative to the center axis of the pipe 70. Thereby, the movable block member 90 can be used to push the ink relatively moving downward to the front. In addition, the size of the gap G1 between the upper portion of the movable block member 90 and the upper portion of the inner surface 30a of the main cylinder 30 becomes larger. Thereby, it is possible to effectively prevent the flow of air flowing into the ink containing portion 21 through the reduced diameter portion 31 from being obstructed by the movable block member 90. In addition, since the inner diameter D _90A is 3.5 times or less the outer diameter D _70B , it is possible to prevent the outer diameter D _{90B of} the movable block member 90 from being too large, thereby effectively suppressing the passage of the reduced diameter portion 31 into the ink containing portion 21 The flow of the inflowing air is obstructed by the movable block member 90.

Especially in this embodiment, the radial thickness T _{90 of the} movable block member 90 is the same as the radial thickness T ₈₀ in the rear end 84 of the fixed block member 80, or is greater than that in the rear end 84 of the fixed block member 80. The thickness T _{80 in} the radial direction is small. In this case, in the writing state shown in FIG. 5, the size of the gap G1 is larger than the gap between the upper part of the fixed block member 80 and the upper part of the inner surface 30a of the main cylinder 30. Therefore, the flow of the air flowing into the ink containing portion 21 through the reduced diameter portion 31 is blocked by the movable block member 90. Furthermore, the thickness T ₈₀ and the thickness T ₉₀ are fixed in the fixed block member 80 and the movable block member 90. The thickness T ₈₀ and the thickness T ₉₀ are defined as the outer diameters of the fixed block member 80 and the movable block member 90 and 1/2 of the difference in inner diameter.

Especially in this embodiment, when the fixed block member 80 and the movable block member 90 are positioned at the foremost position, when the central axis A is arranged parallel to the horizontal direction, the upper edge 94 of the front end 92 of the movable block member 90 is higher than the fixed block member 90. The upper edge 86 of the rear end 84 of the block member 80 is still low. In this case also in the writing state shown in FIG. 5, the size of the gap G1 is larger than the gap between the upper part of the fixed block member 80 and the upper part of the inner surface 30a of the main cylinder 30. Therefore, it is possible to more effectively prevent the flow of air flowing into the ink containing portion 21 through the reduced diameter portion 31 from being blocked by the movable block member 90.

Another problem is that, in the conventional push-type ink inhaler, the flow of ink from the ink accommodating portion to the nib may not proceed smoothly. According to the review of the inventors of the present case, the following reason has been obtained: when the ink advances and passes through the diameter-reducing portion to advance to the nib, the ink stays behind the diameter-reducing portion, hindering the outflow of the ink.

Fig. 6 shows a cross section corresponding to the VI-VI line in Fig. 5. In this embodiment, the main cylinder 30 has a rear rib 33 extending in a plane including the central axis A on the inner surface 30a of the ink containing portion 21. In particular, the main cylinder 30 has a plurality of rear ribs 33 arranged in the circumferential direction. More specifically, the plural rear ribs 33 are arranged at equal angular intervals (equal angular intervals) along the circumferential direction. The rear rib 33 is provided outside the movable range of the piston member 50 in the ink containing portion 21. In addition, the rear rib 33 is provided in the rear inclined surface 31a of the reduced diameter portion 31, outside the range where the blocking surface 82 of the fixed block member 80 abuts. When viewed from the central axis A, each rear rib 33 extends linearly in the axial direction. In addition, it is not limited to this, and each rear rib 33 may extend linearly in a direction inclined to the axial direction when viewed from the center axis A, or may extend in a curved shape when viewed from the center axis A.

Since the main cylinder 30 has such a rear rib 33, the ink in the ink accommodating portion 21 is guided to the reduced diameter portion 31 along the rear rib 33 in the writing state. In the writing state shown in FIG. 5, the lower part of the fixed block member 80 abuts the rear rib 33, and a gap G2 is formed between the lower part of the fixed block member 80 and the lower part of the inner surface 30a of the main cylinder 30. Therefore, the ink in the ink containing portion 21 can flow smoothly to the reduced diameter portion 31 through the gap G2. Thereby, it is possible to effectively suppress the accumulation of ink behind the reduced diameter portion 31.

In addition, in the conventional press type ink inhaler, the fixed block member 80 is attached to the inner surface 30a of the main cylinder 30, which hinders the movement of the fixed block member 80 to the reduced diameter portion 31. In this embodiment, the main cylinder 30 has such a rear rib 33, and a gap G2 is formed between the lower part of the fixed block member 80 and the lower part of the inner surface 30a of the main cylinder 30, so that the fixed block member 80 can be suppressed. Attached to the inner surface 30a of the main cylinder 30.

Furthermore, in the conventional push-type ink inhaler, the fixed block member 80 is a fixed block member 80 that fits into the boundary portion between the inclined surface 31a behind the reduced diameter portion 31 and the parallel portion 30a1 behind it, which sometimes hinders fixing When the block member 80 moves to the reduced diameter portion 31, the aforementioned rear parallel portion 30a1 is a portion of the inner surface 30a of the main cylinder 30 that is parallel to the central axis A. In this embodiment, the main cylinder 30 has such a rear rib 33. Therefore, the fixed block member 80 can also prevent the fixed block member 80 from being fitted into the boundary between the rear inclined surface 31a of the reduced diameter portion 31 and the rear parallel portion 30a1. The fixed block member 80 is stably guided to the reduced diameter portion 31.

In particular, in this embodiment, at least a part of the rear rib 33 is provided on the rear inclined surface 31 a of the reduced diameter portion 31. In this case, the ink in the ink accommodating portion 21 is more effectively guided to the reduced diameter portion 31 along the rear rib 33.

In particular, in the present embodiment, in the rear parallel portion 30a1, the rear rib 33 includes a portion where the distance from the center axis A along the radial direction becomes smaller as it goes to the front. In this case, in this part, the fixed block member 80 is induced to approach the center axis A as it advances forward. Therefore, the fixed block member 80 can be guided to the reduced diameter portion 31 more stably.

In the conventional press-type ink inhaler, air does not flow properly into the ink containing portion, which sometimes hinders the smooth flow of ink from the ink containing portion. When reviewing this subject, the inventors of the present invention obtained the following insight: The air in the accommodating part stays in front of the reduced diameter part, hindering the inflow of the air into the ink accommodating part.

FIG. 7A shows an example of the cross section corresponding to the line VII-VII of FIG. 5, and FIG. 7B shows another example of the cross section corresponding to the line VII-VII of FIG. 5. In particular, FIGS. 7A and 7B show the ink inhaler 20 in a cross section orthogonal to the central axis A. As shown in FIG. In this embodiment, the inner surface 30a of the main cylinder 30 in front of the reduced diameter portion 31 has a front inclined surface 31b inclined to the axial direction and the radial direction, or has a surface extending in a plane including the central axis A of the main cylinder The front rib 34.

In the example shown in FIG. 7A, the main cylinder 30 has a front rib 34. Especially in the example shown in the figure, the main cylinder 30 has a plurality of front ribs 34 arranged in the circumferential direction. More specifically, the plurality of front ribs 34 are arranged at equal angular intervals (equal angular intervals) along the circumferential direction. Each front rib 34 extends linearly in the axial direction when viewed from the central axis A. In addition, it is not limited to this, and each front rib 34 may extend linearly in a direction inclined to the axial direction when viewed from the center axis A, or may extend in a curved shape when viewed from the center axis A.

Since the main cylinder 30 has such a front rib 34, in the writing state, air (bubbles) advancing to the ink containing portion 21 is guided along the front rib 34 to the reduced diameter portion 31. Thereby, it is possible to prevent the air advancing to the ink containing portion 21 from staying in front of the reduced diameter portion 31, and to promote the inflow of the air into the ink containing portion 21. In addition, the ink flowing out of the ink containing portion 21 is guided to the nib support portion 13 along the front rib 34. Thereby, the outflow from the ink containing portion 21 of the ink can also be promoted.

The inventors postulate the principle of such an effect as follows. When the main barrel 30 has such a front rib 34, when the pen tip 12 is directed downward and the longitudinal direction of the writing instrument 10 is inclined to the vertical direction for writing, the front portion of the tube 70 and the inner surface 30a of the main barrel 30 The distance between them will become smaller. Here, the tensile force P of the ink caused by the surface tension T of the ink makes the distance between the tube 40 and the inner surface 30a be r, and the contact angle between the ink and the inner surface 30a is θ, expressed as: P=(2×T×cosθ)/r . Therefore, as the distance r between the tube 40 and the inner surface 30a becomes smaller, it can be presumed that the tensile force P of the ink increases.

Particularly in the example shown in the figure, in a cross section orthogonal to the central axis A, the front rib 34 has a corner 35 facing the central axis A. Since the front rib 34 has such a corner 35, the surface tension acting on the air bubble contacting the corner 35 will adhere to the inner surface 30a of the main cylinder 30 and restrain the air bubble from being trapped in the reduced diameter portion 31. Staying ahead.

Particularly in the example shown in the figure, in the front parallel portion 30a2 parallel to the central axis A in the inner surface 30a, the front rib 34 includes that the distance from the central axis A along the radial direction changes as it goes to the rear. Small part. In this case, in front of the reduced-diameter portion 31, the air advancing toward the ink containing portion 21 is guided to approach the central axis A along the front rib 34 as it advances rearward. Therefore, it is possible to more effectively prevent the air from staying in front of the reduced diameter portion 31.

In the example shown in FIG. 7B, the main cylinder 30 has a front inclined surface 31b. It is a surface extending obliquely to the axial direction and the radial direction toward the outside in the radial direction as it goes forward. The main cylinder 30 has such a front inclined surface 31b, whereby in the writing state, air (bubbles) advancing to the ink containing portion 21 is guided to the reduced diameter portion 31 along the front inclined surface 31b. Thereby, it is possible to prevent the air advancing to the ink containing portion 21 from staying in front of the reduced diameter portion 31, and it is possible to promote the inflow of the air into the ink containing portion 21. In addition, the ink flowing out from the ink containing portion 21 is guided to the nib support portion 13 along the front inclined surface 31b. Thereby, the outflow of ink from the ink containing portion 21 can also be promoted.

Particularly in the example shown in the figure, the front inclined surface 31 b has a groove 32 extending in a plane including the central axis A of the main cylinder 30. Especially in the example shown in the figure, the front inclined surface 31b has a plurality of grooves 32 arranged in the circumferential direction. More specifically, the plurality of grooves 32 are arranged at equal angular intervals (equal angular intervals) along the circumferential direction. Each groove 32 extends linearly in the axial direction when viewed from the central axis A. In addition, it is not limited to this, and each groove 32 may extend linearly in a direction inclined to the axial direction when viewed from the central axis A, or may extend in a curved shape when viewed from the central axis A.

Since the front inclined surface 31b has such a groove 32, air (bubbles) advancing to the ink containing portion 21 is guided along the groove 32 to the reduced diameter portion 31. As a result, the air advancing toward the ink containing portion 21 can be further suppressed from staying in front of the reduced diameter portion 31, and the inflow of the air into the ink containing portion 21 can be further promoted. In addition, the ink flowing out from the ink containing portion 21 is guided to the nib support portion 13 along the groove portion 32. Thereby, the outflow of ink from the ink containing portion 21 can be further promoted.

Especially in the example shown in the figure, the width of the groove 32 in the circumferential direction becomes smaller as it goes to the front. As a result, the capillary force in the groove 32 increases toward the front. Therefore, the ink flowing out of the ink containing portion 21 is sucked forward along the groove portion 32. In this way, the flow of ink from the ink containing portion 21 can be further promoted.

Furthermore, various changes can be added to the above-mentioned embodiment. Hereinafter, modifications will be described with reference to the drawings as appropriate. In the following description and the drawings used in the following description, the same symbols used for the corresponding parts in the above-mentioned embodiment are used for parts that are constructed in the same manner as the above-mentioned embodiment. And omit the repeated description.

FIG. 8 is a longitudinal cross-sectional view showing a modification of the ink inhaler 20, and FIG. 9 is a cross-sectional view corresponding to the line IX-IX of FIG. 8.

In this modification, the main cylinder 30 of the ink inhaler 20 has a plurality of front ribs 34. In particular, in the example shown in FIG. 9, the main cylinder 30 has four front ribs 34 arranged at equal angular intervals along the circumferential direction. That is, in the example shown in the figure, two front ribs 34 adjacent to each other in the circumferential direction are arranged at an angular pitch of 90 degrees to each other.

In the example shown in FIG. 9, each front rib 34 is arrange|positioned with the space|interval S1 along the circumferential direction. Here, the interval S1 refers to the length along the circumferential direction on the inner surface 30 a of the main cylinder 30. In this modification, the interval S1 is 2.7 mm or more. That is, the interval S1 between two front ribs 34 adjacent to each other in the circumferential direction is 2.7 mm or more.

When the interval S1 is 2.7 mm or more, a sufficient interval is ensured between the two adjacent front ribs 34, thereby suppressing air bubbles from being blocked between the two front ribs 34. That is, in the front portion of the reduced diameter portion 31, the retention of air bubbles is suppressed, and the flow of air bubbles is promoted. Thereby, it is possible to promote the outflow of ink generated from the ink containing portion 21 as the air bubbles move backward.

The interval S1 between two front ribs 34 adjacent in the circumferential direction is preferably 2.7 mm or more and 4.7 mm or less. When the interval S1 is 4.7 mm or less, when the longitudinal direction of the writing instrument 10 is inclined to the vertical direction, the distance between the front portion of the tube 70 and the inner surface 30a of the main cylinder 30 can be appropriately reduced. Therefore, the tensile force P of the ink due to the surface tension T of the ink can be effectively increased. In addition, the interval S1 is more preferably 3.3 mm or more and 3.7 mm or less.

Fig. 10 is a cross-sectional view corresponding to the line X-X in Fig. 8. In this modification, the main cylinder 30 of the ink inhaler 20 has a plurality of rear ribs 33. In particular, in the example shown in FIG. 10, the main cylinder 30 has five rear ribs 33 arranged at equal angular intervals along the circumferential direction. That is, in the example shown in the figure, two rear ribs 33 adjacent to each other in the circumferential direction are arranged with an angular pitch of 72 degrees.

In the example shown in FIG. 10, each rear rib 33 is arrange|positioned with the space|interval S2 mutually along the circumferential direction. Here, the interval S2 refers to the length of the inner surface 30a of the main cylinder 30 along the circumferential direction. In this modification, the interval S2 is 2.7 mm or more. That is, the interval S2 between two rear ribs 33 adjacent to each other in the circumferential direction is 2.7 mm or more.

When the interval S2 is 2.7 mm or more, a sufficient interval between the two adjacent rear ribs 33 can be ensured, and therefore, it is possible to suppress air bubbles from being blocked between the two rear ribs 33. That is, in the rear portion of the reduced diameter portion 31, the retention of air bubbles is suppressed, and the flow of air bubbles is promoted. Thereby, it is possible to promote the outflow of the ink generated from the ink containing portion 21 as the air bubbles move backward.

The interval S2 between two rear ribs 33 adjacent in the circumferential direction is preferably 2.7 mm or more and 4.7 mm or less. When the interval S2 is 4.7 mm or less, when the longitudinal direction of the writing instrument 10 is inclined to the vertical direction, the distance between the rear part of the tube 70 and the inner surface 30a of the main cylinder 30 can be appropriately reduced. Therefore, the tensile force P of the ink caused by the surface tension T of the ink can be effectively increased. Moreover, the interval S2 is more preferably 3.3 mm or more and 3.7 mm or less.

10: Writing tools 11: Shaft tube 12: Pen point 13: Pen point support part 14: Ink circulation hole 15: Air circulation hole 16: Mounting part 20: Ink inhaler 21: Ink accommodating part 25: Potential energy imparting member 30: Main tube 30a: inner surface 30a1: rear parallel portion 30a2: front parallel portion 30b: outer surface 31: reduced diameter portion 31a: rear inclined surface 31b: front inclined surface 32: groove 33: rear rib 34: front rib 35: corner 36: Concavo-convex part 40: Tail tube 42: Rear end opening 44: Flange part 50: Piston member 51: Convex flange part 51a: Front end surface 53: Concave part 55: Connecting convex part 57: Hole 59: Through hole 60: Operating member 62: connecting recessed portion 64: convex portion 70: pipe 72: front end 74: rear end 76: enlarged diameter portion 80: fixed block member 82: blocking surface 84: rear end 86: upper edge 90: movable block member 92: Front end 94: Upper edge A: Central axis D _53A : _Inner diameter of recess D _70B : Outer diameter of pipe D _90A : _Inner diameter of movable block member D _90B : Outer diameter of movable block member G1: Gap G2: Gap P: tensile force r: distance S1: interval S2: interval T ₈₀ : thickness in the radial direction of the rear end of the fixed block member T ₉₀ : thickness in the radial direction of the movable block member θ: contact angle

Fig. 1 is a diagram for explaining an embodiment of the present invention, and shows a cross section of a writing instrument incorporating an ink inhaler. Fig. 2 is an enlarged cross-sectional view showing the ink inhaler, particularly showing the ink inhaler in an open state. Fig. 3 is a cross-sectional view showing the ink inhaler with its operating member pushed forward. Fig. 4 shows the ink inhaler in a state where the pen tip faces upward. Fig. 5 is a cross-sectional view showing the ink inhaler in a state where the central axis is inclined to the vertical direction. Fig. 6 shows a cross section corresponding to the VI-VI line in Fig. 5. Fig. 7A shows an example of a cross section corresponding to the line VII-VII in Fig. 5. Fig. 7B shows another example of the cross section corresponding to the line VII-VII in Fig. 5. Fig. 8 is a cross-sectional view showing a modification of the ink inhaler. Fig. 9 is a cross-sectional view corresponding to the line IX-IX in Fig. 8. Fig. 10 is a cross-sectional view corresponding to the line X-X in Fig. 8.

13: Pen point support

14: Ink circulation hole

15: Air circulation hole

16: Installation Department

20: Ink inhaler

21: Ink receiving part

25: Grant Potential Energy Component

30: main tube

30a: inner surface

30a1: Rear parallel part

30a2: Front parallel part

30b: outer surface

31: Reduced diameter part

31a: rear inclined surface

31b: Front slope

33: rear ribs

34: front rib

36: Concave and convex part

40: tail tube

42: Rear end opening

44: flange

50: Piston component

51: convex flange

51a: Front face

53: recess

55: connecting convex

57: Hole

59: Through hole

60: Operating member

62: connecting recess

64: convex

70: pipe fittings

72: front end

74: rear end

76: Enlarging part

80: fixed block member

82: occluded surface

84: rear end

90: movable block member

92: Front end

A: Central axis

D _53A : The inner diameter of the recess

D _70B : Outer diameter of pipe fitting

D _90A : _Inner diameter of movable block member

D _90B : Outer diameter of movable block member

T ₈₀ : The thickness in the radial direction of the rear end of the fixed block member

T ₉₀ : The thickness of the movable block member in the radial direction

Claims (11)

An ink inhaler with: The main cylinder has a reduced diameter portion on the inner surface, and an ink containing portion is defined behind the aforementioned reduced diameter portion; The piston member is configured to be movable back and forth relative to the aforementioned main cylinder; The tube extends inside the main cylinder through the reduced diameter portion, and is held so as to be movable back and forth relative to the piston member; and The fixing block member is fixed to the pipe fitting behind the reduced diameter portion, The inner surface of the main cylinder in front of the reduced diameter portion has a front inclined surface inclined with respect to the axial direction and the radial direction, or has a front rib extending in a plane including the central axis of the main cylinder. The ink inhaler of claim 1, wherein the main cylinder has the front inclined surface, and the front inclined surface has a groove extending in a plane including the central axis of the main cylinder. The ink inhaler of claim 2, wherein the main cylinder has a plurality of the grooves arranged in the circumferential direction. The ink inhaler of claim 2 or 3, wherein the width of the groove in the circumferential direction decreases as it goes to the front. The ink inhaler of claim 1, wherein the main cylinder has the front rib, and in a cross-section orthogonal to the center axis, the front rib has a corner that faces the center axis. The ink inhaler of claim 1 or 5, wherein the main cylinder has the front rib, and in the front parallel portion parallel to the center axis of the inner surface, the front rib includes The distance between the aforementioned central axis in the radial direction will become smaller. The ink inhaler of claim 1 or 5, wherein the main cylinder has a plurality of the front ribs arranged in the circumferential direction. Such as the ink inhaler of claim 7, wherein the interval between two adjacent front ribs in the circumferential direction is 2.7 mm or more. The ink inhaler of claim 1, wherein the inner surface of the main cylinder has a rear rib extending in a plane including the central axis of the main cylinder on the inner surface of the ink containing portion. The ink inhaler of claim 9, wherein the main cylinder has a plurality of the rear ribs arranged in the circumferential direction. Such as the ink inhaler of claim 10, wherein the interval between two adjacent rear ribs in the circumferential direction is 2.7 mm or more.

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