JP2022131670A - Pressurizing writing instrument - Google Patents

Abstract

To provide a pressurizing writing instrument capable of easily recognizing whether or not a pressurizing mechanism for applying pressure to ink in a refill is operating.SOLUTION: A pressurizing writing instrument 10 includes a barrel 20, a refill 30 arranged in the barrel 20 and having an ink containing cylinder 33 filled with ink, a pressurizing mechanism 50 that applies pressure to the rear end of the ink by retracting the refill 30, and a first display portion 91 that indicates the operating state of the pressurizing mechanism 50.SELECTED DRAWING: Figure 1

Description

The present invention relates to a pressurized writing instrument.

2. Description of the Related Art Conventionally, among writing instruments such as ball-point pens, pressurized writing instruments capable of applying pressure to ink filled inside are known. Patent Document 1 describes a refill filled with ink in a barrel, a holder annularly mounted on the rear end side of the refill, and a sealing member (valve, etc.) such as an O-ring annularly mounted on the outer peripheral surface of the holder and a cylinder that covers the holder from the rear and holds the holder so that it can move back and forth. A pressure writing instrument is disclosed.

Japanese Patent No. 5558908

With conventional pen pressure type writing instruments, the user cannot know whether or not the pressure mechanism that applies pressure to the ink in the refill is operating during writing.

SUMMARY OF THE INVENTION The present invention has been made in consideration of such points, and provides a pressurized writing utensil that can easily recognize whether or not a pressurizing mechanism that applies pressure to ink in a refill is operating. intended to

The pressurized writing instrument according to the present invention comprises:
an axle tube;
a refill disposed within the barrel and having an ink reservoir filled with ink;
a pressurizing mechanism that applies pressure to the trailing edge of the ink by retracting the refill;
and a first display section for indicating an operating state of the pressurizing mechanism.

In the pressurized writing instrument according to the present invention,
The first display unit is
a first window formed in the barrel;
A first marker disposed in the barrel and moving back and forth integrally with the refill may be included.

In the pressurized writing instrument according to the present invention,
The first marker may be visible from the outside of the barrel through the first window portion when the pressure mechanism is operating.

In the pressurized writing instrument according to the present invention,
a retracting mechanism for retracting the tip of the refill from the front end opening of the barrel;
A second display section for indicating an operating state of the retraction mechanism may be further included.

In the pressurized writing instrument according to the present invention,
The second display unit is
a second window formed in the barrel;
A second marker disposed in the barrel and moving back and forth integrally with the refill may be included.

In the pressurized writing instrument according to the present invention,
The second marker is
visible from the outside of the shaft cylinder through the second window when the tip protrudes from the front end opening and the pressure mechanism is not in operation,
The tip may not be visible from the outside of the barrel through the second window when the tip protrudes from the front end opening and the pressurizing mechanism is operating.

According to the present invention, it is possible to provide a pressurized writing utensil that can easily recognize whether or not a pressurizing mechanism that applies pressure to ink in a refill is operating.

FIG. 1 is a diagram showing an example of a pressurized writing instrument according to an embodiment of the present invention, showing the appearance of the pressurized writing instrument in a state in which a ballpoint pen tip is retracted. FIG. 2 is a longitudinal sectional view showing a pressurized writing instrument. FIG. 3 is an enlarged view of a part of the pressurized writing instrument. FIG. 4 is a perspective view showing a cylinder member of the pressurizing mechanism of the pressurized writing instrument. FIG. 5 is a diagram showing a switching mechanism of the pressurizing mechanism in the pressurizable state. FIG. 6 is a diagram showing the switching mechanism in a non-pressurizable state. FIG. 7 is a perspective view showing a switching member of the switching mechanism. FIG. 8 is a perspective view showing a switching member of the switching mechanism. FIG. 9 is a perspective view showing part of a tubular member of the switching mechanism. FIG. 10 is a perspective view showing part of the switching mechanism in a pressurizable state. FIG. 11 is a perspective view showing a part of the switching mechanism in a non-pressurizable state. FIG. 12 is a diagram showing the first display section and the second display section in an immersed state. FIG. 13 is an enlarged view showing a portion of the pressure writing instrument in the protruded state. 14 is a diagram showing the first display section and the second display section in the state of FIG. 13. FIG. FIG. 15 is a diagram for explaining the operation of the pressurizing mechanism. 16 is a diagram showing the first display section and the second display section in the state of FIG. 15. FIG. FIG. 17 is a diagram for explaining the operation of the pressurizing mechanism. 18 is a diagram showing the first display section and the second display section in the state of FIG. 17. FIG. FIG. 19 is a diagram for explaining the operation of the pressurizing mechanism. 20 is a diagram showing the first display section and the second display section in the state of FIG. 19. FIG.

An embodiment of the present invention will be described below with reference to the drawings. In the drawings attached to this specification, for the convenience of illustration and ease of understanding, the scale, length-to-width ratio, etc. are appropriately changed and exaggerated from those of the real thing.

In addition, terms such as "parallel", "perpendicular", "identical", length and angle values, etc. that specify shapes and geometric conditions and their degrees used in this specification are strictly It shall be interpreted to include the extent to which similar functions can be expected without being bound by the meaning.

In this specification, the direction in which the central axis A of the writing instrument extends (longitudinal direction, vertical direction in a vertical cross-sectional view) is the axial direction da, the direction orthogonal to the axial direction da is the radial direction, and the direction along the circumference around the central axis A Let the direction be the circumferential direction. In addition, along the axial direction da, the side closer to the surface to be written, such as a paper surface, is defined as the front side, and the side away from the surface to be written is defined as the rear side. That is, the pen tip side is the front, and the side opposite the pen tip is the rear. In the radial direction, the side closer to the central axis A is defined as the inner side, and the side away from the central axis A is defined as the outer side.

FIG. 1 is a view showing an example of a pressurized writing instrument 10 according to an embodiment of the present invention, showing an appearance of the pressurized writing instrument 10 in a state in which a ballpoint pen tip is retracted. FIG. 2 is a longitudinal sectional view showing the pressure writing instrument 10 of FIG. FIG. 3 is an enlarged view of a part of the pressurized writing instrument 10. As shown in FIG. In particular, FIG. 3 shows an enlarged view of the retractable mechanism 40 and the pressure mechanism 50 of the pressurized writing instrument 10 .

In this embodiment, an example in which the pressurized writing instrument 10 is a ballpoint pen will be described. The pressurized writing instrument 10 includes a barrel 20 , a refill 30 , a retractable mechanism 40 and a pressurizing mechanism 50 . In the pressurized writing instrument 10 of the present embodiment, the pressure mechanism 50 applies pressure to the rear end surface of the ink contained in the refill 30 to increase the amount of ink ejected from the pen tip of the pressurized writing instrument 10. Let As a result, the density and width of the handwriting formed using the pressurized writing instrument 10 are increased.

The barrel 20 has a front shaft 21 , a grip member 25 arranged to surround the outer peripheral surface of the front shaft 21 , and a rear shaft 26 connected to the rear end portion of the front shaft 21 . The front barrel 21 is a member having a substantially cylindrical shape, and has a front end opening 23 in which the tip of a ball-point pen tip 34 to be described later can be retracted. The grip member 25 is made of an elastic member such as rubber or elastomer, and is intended to be gripped by the user's fingers when writing with the pressure writing instrument 10 . The rear shaft 26 is a member having a substantially cylindrical shape and arranged behind the front shaft 21 . The rear shaft 26 is connected to the front shaft 21 by attaching the front end portion of the rear shaft 26 to the rear end portion of the front shaft 21 . As an example, a female threaded portion formed on the inner periphery of the front end portion of the rear shaft 26 is screwed into a male threaded portion formed on the outer periphery of the rear end portion of the front shaft 21, whereby the rear shaft 26 is It is connected to the front shaft 21 . The inner surface of the rear shaft 26 is provided with a protrusion that protrudes inward, and the forward facing surface of the protrusion forms an abutment portion 27 with which a stepped portion 74 of a cylinder member 70, which will be described later, abuts. A rearward facing surface of the projecting portion forms a receiving portion 28 for receiving an elastic member 43, which will be described later. The rear shaft 26 has, at its rear end, a rear end opening 29 into which a tubular member 59, which will be described later, is inserted so as to be able to move back and forth. Such front shaft 21 and rear shaft 26 are made of resin, for example.

The rear axle 26 is formed with a first window portion 91a and a second window portion 92a. The first window portion 91a is part of the first display portion 91, which will be described later, and the second window portion 92a is part of the second display portion 92, which will be described later. The first window portion 91a and the second window portion 92a are through holes penetrating the rear shaft 26 along the radial direction. In the example shown in FIG. 1, the second window portion 92a is arranged in front of the first window portion 91a. Note that the second window portion 92a is not limited to this, and may be arranged behind the first window portion 91a. Details of the first display portion 91 and the second display portion 92, and details of the first window portion 91a and the second window portion 92a will be described later.

A clip 12 is attached to the outer surface of the rear axle 26 . The clip 12 is configured such that an arbitrary member (paper, cloth, etc.) can be sandwiched between the clip 12 and the outer surface of the rear axle 26 . Clip 12 is provided rotatably about axis 14 with respect to rear shaft 26 . The axis 14 extends so as to be positioned at a twist with respect to the central axis A. As shown in FIG. More specifically, the axis 14 extends in a direction orthogonal to a straight line parallel to the central axis A. A resilient member 18 is arranged in a compressed state between a portion of the clip 12 located behind the axis 14 and the outer surface of the rear shaft 26 . Thereby, the front end of the clip 12 is pressed against the outer surface of the rear axle 26 . A coil spring, for example, can be used as the resilient member 18 . The clip 12 has, at its front end portion, an engaging portion 16 to which an engaging portion 75 of the cylinder member 70 described below is engaged. In the present embodiment, by locking the locking portion 75 to the locked portion 16 , the protruding state of the ball-point pen tip 34 from the front end opening 23 can be fixed. Further, by releasing the locking of the locking portion 75 to the locked portion 16 , the protruding state of the ball-point pen tip 34 from the front end opening 23 can be cancelled. That is, in the present embodiment, the clip 12 also functions as a mechanism for fixing and releasing the projecting state of the ball-point pen tip 34 from the front end opening 23 .

The refill 30 is arranged inside the barrel 20 . The refill 30 of this embodiment includes an ink containing cylinder 33 containing ink and a ballpoint pen tip 34 attached to the front end of the ink containing cylinder 33 . The ink container tube 33 is a member having a tubular shape extending in the front-rear direction. The ink containing cylinder 33 contains ink inside. The ink containing cylinder 33 is made of resin, for example.

As the ink, any ink that can be used for writing instruments, such as oily ink, water-based ink, gel ink, and thermochromic ink, can be used without particular limitation. Among these inks, low-viscosity inks with a shear rate of 1.92 (sec ⁻¹ ) under an environment of 20° C. and an ink viscosity of 5000 (mPa·s) or less have a large increase or decrease in ink discharge amount due to pressurization. Since the density, width, etc. of the handwriting change greatly due to pressure, it can be suitably used for the writing instrument of the present embodiment. As an example, a thermochromic ink can be used as the ink. The thermochromic ink may be a reversible thermochromic ink. Reversible thermochromic inks are those that change from a colored state to a colored state by heating, and change from a colored state to a colored state by cooling. Various reversible thermochromic inks, such as a heat color development type that changes from a color development state to a color disappearance state, or a color memory retention type that exhibits a specific color in a specific temperature range and changes color depending on temperature, can be used alone or They may be used in combination. For example, an ink containing a reversible thermochromic microcapsule pigment can be used as a reversible thermochromic ink.

An ink follower may be arranged in the ink reservoir tube 33 behind the ink. The ink follower prevents the ink from leaking out from the ink containing cylinder 33 and suppresses drying of the ink. An ink follower is placed in contact with the trailing edge of the ink. When the ink is consumed and the trailing edge of the ink moves forward, the ink follower follows the trailing edge of the ink and moves forward. As such an ink follower, for example, a grease-like member can be used.

Ballpoint pen tip 34 has a ball. The ball is held within a ball holding chamber provided at the front end of ballpoint pen tip 34 . Ink adheres to the ball in the ball holding chamber, and when writing is performed, the ink adhered to the ball is transferred to the surface to be written by rotating the ball in contact with the surface to be written such as a paper surface. A rear end portion of the ballpoint pen tip 34 is inserted into a front end portion of the ink containing cylinder 33 , whereby the ballpoint pen tip 34 is attached to the ink containing cylinder 33 .

Next, the pressurizing mechanism 50 will be described. 2 and 3, the pressurizing mechanism 50 includes a piston member 60, a cylinder member 70, a first sealing member 81, a second sealing member 82, a third sealing member 83, a switching a mechanism 90;

The piston member 60 is arranged in the barrel 20 at the rear of the refill 30 so as to be movable back and forth. The piston member 60 has a through hole extending in the front-rear direction. The piston member 60 has an inner surface 61 defining this through hole and an outer surface 63 defining the outer shape of the piston member 60 . The outer surface 63 has a first large diameter portion 63a and a first small diameter portion 63b located behind the first large diameter portion 63a. Both the first large diameter portion 63a and the first small diameter portion 63b have a cylindrical shape whose central axis coincides with the central axis A, and the first large diameter portion 63a is larger than the diameter of the first small diameter portion 63b. also has a large diameter. An outer stepped portion 63c is formed between the first large diameter portion 63a and the first small diameter portion 63b. In the illustrated example, the outer stepped portion 63c is an inclined surface that is inclined with respect to both the axial direction da and the radial direction. In particular, the outer stepped portion 63c is a slanted surface directed radially inward from the front to the rear. A rear end opening 65 is formed at the rear end of the piston member 60 . The rear end opening 65 communicates the inside and the outside of the piston member 60 . A first concave portion 63d in which the first seal member 81 is arranged is formed in the first large diameter portion 63a. A second concave portion 63e in which the second sealing member 82 is arranged is formed in the first small diameter portion 63b. Both the first recess 63d and the second recess 63e extend annularly in the circumferential direction.

The piston member 60 has a through hole 67 connecting the inner surface 61 and the outer surface 63 between the first recess 63d and the second recess 63e. The through hole 67 communicates the inside and the outside of the piston member 60 . In the illustrated example, the through hole 67 is provided in the first small diameter portion 63b. Specifically, the through hole 67 is provided in the first small diameter portion 63b between the outer stepped portion 63c and the second recessed portion 63e. The through hole 67 extends radially. The through hole 67 may be provided in the first large diameter portion 63a between the first concave portion 63d and the outer stepped portion 63c, or may be provided in the outer stepped portion 63c.

The piston member 60 further has a collar portion 69 arranged in front of the first large diameter portion 63a. The collar portion 69 has an outer diameter larger than the diameter (outer diameter) of the first large diameter portion 63a. The collar portion 69 has a first receiving portion 63f, which is a surface facing rearward. The first receiving portion 63f receives the elastic force of the elastic member 55 in cooperation with a second receiving portion 71d of the cylinder member 70, which will be described later.

The collar portion 69 is engaged with the refill holding member 51 . The refill holding member 51 is a member that holds the refill 30 . The rear end of the refill holding member 51 is inserted into the collar portion 69 and fixed to the collar portion 69 . The rear end of the refill 30 is inserted into the front end of the refill holding member 51 and fixed to the refill holding member 51 . Thereby, the refill 30 can move back and forth integrally with the piston member 60 .

A first marker 91 b and a second marker 92 b are provided on the outer surface of the refill holding member 51 . The first marker 91b is part of the first display section 91, which will be described later, and the second marker 92b is part of the second display section 92, which will be described later. The first marker 91b and the second marker 92b are provided so as to be visually distinguishable from the surrounding portions of the markers 91b and 92b. For example, the first marker 91b and the second marker 92b are provided by printing on the outer surface of the refill holding member 51 using ink having a color different from that of the portions surrounding the markers 91b and 92b. In the examples shown in FIGS. 2 and 3, the markers 91b and 92b both have annular shapes extending in the circumferential direction. The first marker 91b and the second marker 92b may have the same color, or may have different colors. In the example shown in FIGS. 2 and 3, the second marker 92b is arranged forward of the first marker 91b. Note that the second marker 92b is not limited to this, and may be arranged behind the first marker 91b.

FIG. 4 is a perspective view showing the cylinder member 70. FIG. In FIG. 4, the cylinder member 70 is shown cut along a plane passing through the center axis A. As shown in FIG. In the example shown in FIGS. 2 and 3, the cylinder member 70 is arranged in the barrel 20 so as to be movable back and forth. The cylinder member 70 is arranged radially outside the piston member 60 so as to surround the piston member 60 . The cylinder member 70 has a through hole extending in the front-rear direction. The cylinder member 70 has an inner surface 71 that defines this through hole and an outer surface 73 that defines the outer shape of the cylinder member 70 . The inner surface 71 has a second large diameter portion 71a and a second small diameter portion 71b located behind the second large diameter portion 71a. The second large-diameter portion 71a and the second small-diameter portion 71b both have a cylindrical shape whose central axis coincides with the central axis A, and the second large-diameter portion 71a is larger than the diameter of the second small-diameter portion 71b. also has a large diameter. An inner stepped portion 71c is formed between the second large diameter portion 71a and the second small diameter portion 71b. In the illustrated example, the inner stepped portion 71c is an inclined surface that is inclined with respect to both the axial direction da and the radial direction. In particular, the inner stepped portion 71c is a slanted surface that extends radially inward from the front to the rear. The inner stepped portion 71c faces the outer stepped portion 63c of the piston member 60 along the axial direction da. A space S surrounded by the outer stepped portion 63c, the inner stepped portion 71c, the outer surface 63 of the piston member 60, and the inner surface 71 of the cylinder member 70 is formed between the outer stepped portion 63c and the inner stepped portion 71c.

The inner surface 71 has a second receiving portion 71d located forward of the second large diameter portion 71a. The second receiving portion 71d is a surface facing forward. An elastic member 55 is arranged between the first receiving portion 63f of the piston member 60 and the second receiving portion 71d of the cylinder member 70. As shown in FIG. The second receiving portion 71d receives the elastic force of the elastic member 55 in cooperation with the first receiving portion 63f. A coil spring, for example, can be used as the resilient member 55 .

A stepped portion 74 is formed on the outer surface 73 of the cylinder member 70 . The stepped portion 74 is a rearward facing surface of the outer surface 73 of the cylinder member 70 . The stepped portion 74 contacts the contact portion 27 of the rear shaft 26 when the cylinder member 70 moves rearward due to the elastic force of the elastic member 43 which will be described later. This restricts further rearward movement of the cylinder member 70 .

An outer surface 73 of the front end portion of the cylinder member 70 is provided with a locking portion 75 that can be locked to the locked portion 16 of the clip 12 . The locking portion 75 is formed of a protruding portion that protrudes radially outward from the outer surface 73 . When the cylinder member 70 moves forward and the locking portion 75 is positioned forward of the locked portion 16 , the locking portion 75 is locked to the locked portion 16 . This restricts the rearward movement of the cylinder member 70 .

Cylinder member 70 has a forward end 77 and a rearward end 79 . The front end 77 can contact the flange portion 69 (first receiving portion 63f) of the piston member 60 when the elastic member 55 is compressed. An intermediate portion of the piston member 60 is positioned within the through hole of the cylinder member 70 . A flange portion 69 of the piston member 60 is positioned forward of the front end 77 of the cylinder member 70 . A rear end opening 65 of the piston member 60 is positioned rearward of a rear end 79 of the cylinder member 70 .

A rear end 79 of the cylinder member 70 is provided with a recess 79a. The recess 79a is provided on the inner surface 71 from the rear end 79 toward the front. The recess 79a has a cylindrical shape with a central axis that coincides with the central axis A. As shown in FIG. A groove portion 79b is further provided in the concave portion 79a. The groove portion 79b is a portion in which a part of an engaging portion 57b of an engaging member 57, which will be described later, is arranged. The groove portion 79b is a groove formed radially outward from the outer periphery of the recess portion 79a. Both the recess 79 a and the groove 79 b open at the rear end 79 of the cylinder member 70 . The cylinder member 70 may be provided with a plurality of grooves 79b. When viewed from the axial direction da, the plurality of grooves 79b may be arranged at equal angular intervals. In the example shown in FIGS. 2-4, the cylinder member 70 has two grooves 79b. The two grooves 79b are arranged with an angular interval of 180 degrees from each other when viewed from the axial direction da.

Both the first sealing member 81 and the second sealing member 82 are members that seal between the outer surface 63 of the piston member 60 and the inner surface 71 of the cylinder member 70 . In particular, the first seal member 81 seals between the piston member 60 and the cylinder member 70 in front of the outer stepped portion 63 c of the piston member 60 . Also, the second seal member 82 seals between the piston member 60 and the cylinder member 70 behind the inner stepped portion 71 c of the cylinder member 70 . The first seal member 81 is arranged in the first recess 63 d of the piston member 60 , and the second seal member 82 is arranged in the second recess 63 e of the piston member 60 . Both the first sealing member 81 and the second sealing member 82 are elastic bodies extending over the entire circumference. For example, an O-ring is used as the elastic body. The radial diameter of the first sealing member 81 is larger than the radial diameter of the second sealing member 82 .

The third seal member 83 is arranged behind the piston member 60 and configured to seal the rear end opening 65 of the piston member 60 . In this embodiment, at least the portion of the third seal member 83 that contacts the rear end opening 65 is made of an elastic material such as rubber or elastomer. Alternatively, for example, an elastic body may be arranged around the rear end opening 65 of the piston member 60, and the third seal member 83 may be formed of a hard member. In the illustrated example, the third seal member 83 is fixed to the switching member 85 of the switching mechanism 90 .

The switching mechanism 90 is a mechanism for switching the pressurizing mechanism 50 between a pressurizable state and a pressurizable state. 5 is a diagram showing the switching mechanism 90 in the pressurization possible state, and FIG. 6 is a diagram showing the switching mechanism 90 in the pressurization impossible state. 7 and 8 are perspective views showing the switching member 85. FIG. FIG. 9 is a perspective view showing part of the tubular member 59. As shown in FIG. In FIG. 9, the cylindrical member 59 is shown cut along a plane passing through the central axis A. As shown in FIG.

The pressurizable state refers to a state in which pressure is applied to the trailing edge of the ink by the pressurizing mechanism 50 when the refill 30 is retracted during writing. In addition, the non-pressurizable state refers to a state in which pressure is not applied to the trailing edge of the ink by the pressure mechanism 50 during writing. More specifically, the non-pressurizable state refers to a state in which the pressure mechanism 50 does not apply pressure to the trailing edge of the ink even if the refill 30 receives a backward force due to writing pressure during writing. The pressurization disabled state may be a state in which the pressure mechanism 50 does not apply pressure to the trailing edge of the ink because the refill 30 is prevented from retreating. The pressurization disabled state is not limited to this, and may be a state in which pressure is not applied to the trailing edge of the ink by the pressurizing mechanism 50 even when the refill 30 is retracted. In this embodiment, the switching mechanism 90 includes an engaging member 57 , a switching member 85 and a tubular member 59 .

The engaging member 57 is a member that cooperates with the switching member 85 to allow or prevent the refill 30 from retreating. The engagement member 57 is fixed to the rear end of the piston member 60 . The engaging member 57 is immovable with respect to the piston member 60 in the axial direction da, the radial direction, and the circumferential direction. Therefore, the engaging member 57 moves integrally with the piston member 60 inside the barrel 20 . The engaging member 57 has a body portion 57a and an engaging portion 57b. The body portion 57a is an annular member extending in the circumferential direction around the central axis A (see FIGS. 10 and 11). In this embodiment, the engagement member 57 is fixed to the piston member 60 by fixing the main body portion 57a to the rear end portion of the piston member 60 . The body portion 57a is arranged within the recess 79a of the cylinder member 70 . This restricts the forward movement of the piston member 60 with respect to the cylinder member 70 .

The engaging portion 57b protrudes radially outward from the outer periphery of the body portion 57a. The engaging member 57 may have a plurality of engaging portions 57b. A part of the front side of each engaging portion 57 b is arranged in the corresponding groove portion 79 b of the cylinder member 70 . Therefore, circumferential movement of the engaging member 57 with respect to the cylinder member 70 is restricted. The engaging member 57 has the same number of engaging portions 57b as the number of groove portions 79b. Each engaging portion 57b is provided at a position corresponding to the position of each groove portion 79b. The plurality of engaging portions 57b may be arranged at equal angular intervals when viewed from the axial direction da. In the example shown in FIGS. 2-4, the engaging member 57 has two engaging portions 57b. The two engaging portions 57b are arranged with an angular interval of 180 degrees from each other when viewed from the axial direction da. The engaging portion 57b further protrudes rearward from the body portion 57a. In the pressurizable state, when the engaging member 57 is retracted with the retraction of the refill 30, a part of the rear side of the engaging portion 57b is positioned inside a first groove portion 85d of the switching member 85, which will be described later. become.

The switching member 85 is arranged behind the engaging member 57 inside the barrel 20 . The switching member 85 has a substantially cylindrical shape with a central axis that coincides with the central axis A. As shown in FIG. The switching member 85 has a stepped portion 85a on its inner surface. The third seal member 83 is held by the stepped portion 85 a , thereby restricting the rearward movement of the third seal member 83 with respect to the switching member 85 . A flange portion 85b is provided at the front end portion of the switching member 85 and protrudes radially outward. The collar portion 85b has a receiving portion 85c. The receiving portion 85c is a rear facing surface of the collar portion 85b. The receiving portion 85c receives the elastic force of the elastic member 87 in cooperation with a second receiving portion 59b of the cylindrical member 59, which will be described later.

A first groove portion 85 d is provided at the front end of the switching member 85 . In the pressurizable state, when the engaging member 57 is retracted with the retraction of the refill 30, the rear part of the engaging portion 57b of the engaging member 57 is positioned within the first groove portion 85d. Become. Therefore, the first groove portions 85d are provided in a number and arrangement corresponding to the number and arrangement of the engaging portions 57b of the engaging member 57. As shown in FIG. Also, the first groove portion 85d has a shape and size that can accommodate a portion of the rear side of the engaging portion 57b. In the example shown in FIGS. 5 and 7, the first groove portion 85d radially extends from the outer circumference of the front end portion of the through hole that penetrates the switching member 85 in the front-rear direction. The switching member 85 may have a plurality of first grooves 85d. When viewed from the axial direction da, the plurality of first grooves 85d may be arranged at equal angular intervals. In the illustrated example, the switching member 85 has two first grooves 85d. The two first grooves 85d are arranged with an angular interval of 180 degrees from each other when viewed from the axial direction da.

A second groove portion 85 e is provided on the outer surface of the switching member 85 . The second groove portion 85e includes a first portion 85e1 extending in the axial direction da and a second portion 85e2 extending in the circumferential direction from the rear end of the first portion 85e1. The switching member 85 may have a plurality of second grooves 85e. When viewed from the axial direction da, the plurality of second grooves 85e may be arranged at equal angular intervals. In the illustrated example, the switching member 85 has two second grooves 85e. The two second grooves 85e are arranged with an angular interval of 180 degrees from each other when viewed from the axial direction da.

A tubular member 59 is engaged with the rear end portion of the cylinder member 70 . The tubular member 59 has a substantially cylindrical shape with a central axis that coincides with the central axis A. As shown in FIG. The tubular member 59 is arranged radially outside the rear end portion of the cylinder member 70 , the engaging member 57 and the switching member 85 . The tubular member 59 is engaged with the outer surface 73 at the rear end of the cylinder member 70 , thereby fixing the tubular member 59 relative to the cylinder member 70 . The tubular member 59 has a first receiving portion 59a and a second receiving portion 59b. The first receiving portion 59a is a surface of a stepped portion formed on the outer surface of the cylindrical member 59 facing forward. An elastic member 43 is arranged between the receiving portion 28 of the rear axle 26 and the first receiving portion 59 a of the tubular member 59 . The resilient member 43 may be arranged in a compressed state between the receiving portion 28 and the first receiving portion 59a. The first receiving portion 59 a receives the elastic force of the elastic member 43 in cooperation with the receiving portion 28 . A coil spring, for example, can be used as the resilient member 43 .

The rear end portion of the cylindrical member 59 is provided with an inner flange portion 59c protruding inward. The second receiving portion 59b is a surface of the inner collar portion 59c facing forward. An elastic member 87 is arranged between the receiving portion 85 c of the switching member 85 and the second receiving portion 59 b of the tubular member 59 . The resilient member 87 may be arranged in a compressed state between the receiving portion 85c and the second receiving portion 59b. The second receiving portion 59b receives the elastic force of the elastic member 87 in cooperation with the receiving portion 85c. A coil spring, for example, can be used as the resilient member 87 .

The tubular member 59 has a convex portion 59d. The convex portion 59d is a portion that protrudes radially inward from the inner collar portion 59c. The convex portion 59 d is located inside the second groove portion 85 e of the switching member 85 . Therefore, the protrusions 59 d are provided in a number and arrangement corresponding to the number and arrangement of the second grooves 85 e of the switching member 85 . The tubular member 59 may have a plurality of protrusions 59d. When viewed from the axial direction da, the plurality of protrusions 59d may be arranged at equal angular intervals. In the examples shown in FIGS. 5, 6 and 9-11, the tubular member 59 has two projections 59d. The two protrusions 59d are arranged with an angular interval of 180 degrees from each other when viewed from the axial direction da.

A knock body 45 is fixed to the rear end portion of the switching member 85 . The knock body 45 is a member that the user touches when performing the retracting operation of the pen tip in the pressurized writing instrument 10 . When the user presses the knock body 45 forward, the pen point of the pressurized writing instrument 10 appears and disappears from the front end opening 23 . The knock body 45 has a forward protrusion 46 at its front end. The forward protrusion 46 is inserted into the switching member 85 from the rear end of the switching member 85 . The forward protrusion 46 is press-fitted into the switching member 85, whereby the switching member 85 and the knock body 45 are fixed with respect to each other. In this state, the knock body 45 is immovable with respect to the switching member 85 in the axial direction da, the radial direction, and the circumferential direction. Therefore, the switching member 85 moves integrally with the knock body 45 .

FIG. 10 is a perspective view showing part of the switching mechanism 90 in the pressurizable state, and FIG. 11 is a perspective view showing part of the switching mechanism 90 in the non-pressurizable state. 10 and 11, the engaging member 57 is shown in its entirety, while the switching member 85, the tubular member 59 and the knock body 45 are shown cut along a plane passing through the central axis A. FIG. 10 and 11, illustration of members other than the engaging member 57, the switching member 85, the cylindrical member 59 and the knock body 45 is omitted.

A part of the front side of the engaging portion 57b of the engaging member 57 is arranged in the corresponding groove portion 79b of the cylinder member 70 . This restricts the circumferential movement of the engaging member 57 with respect to the cylinder member 70 . Further, the cylindrical member 59 is fixed to the cylinder member 70, and movement of the cylindrical member 59 in the circumferential direction with respect to the cylinder member 70 is restricted. Therefore, the engaging member 57 does not substantially move in the circumferential direction with respect to the tubular member 59 . Here, "substantially no movement" means no movement other than minute movement due to "play" that may be formed between members. Further, the forward protruding portion 46 of the knock body 45 is press-fitted into the switching member 85, whereby the switching member 85 and the knock body 45 are fixed to each other. That is, the switching member 85 moves integrally with the knock body 45 . When the user rotates the knocking body 45 around the central axis A, the knocking body 45 and the switching member 85 rotate relative to the engaging member 57 and the cylindrical member 59 . In this embodiment, when the user rotates the knock body 45 around the central axis A, the pressurizing mechanism 50 (switching mechanism 90) can be switched between a pressurizable state and a pressurizable state. is.

As shown in FIG. 10, when the circumferential position of the engaging portion 57b of the engaging member 57 coincides with the circumferential position of the first groove portion 85d of the switching member 85, the tubular member 59 is The circumferential position of the convex portion 59d and the circumferential position of the first portion 85e1 of the second groove portion 85e of the switching member 85 match. In other words, when the engaging portion 57b and the first groove portion 85d overlap when viewed in the axial direction da, the convex portion 59d and the first portion 85e1 overlap when viewed in the axial direction da. At this time, the pressurizing mechanism 50 (switching mechanism 90) enters a pressurizing state. As described above, the engagement member 57 moves integrally with the piston member 60 . In the pressurizable state, the engaging portion 57b can enter the first groove portion 85d when the refill 30 is retracted due to writing pressure during writing. Also, the convex portion 59d can enter the first portion 85e1 of the second groove portion 85e. As a result, in the pressurizable state, the refill 30 can be sufficiently retracted when writing pressure is applied to the refill 30 during writing.

As shown in FIG. 11, when the circumferential position of the engaging portion 57b of the engaging member 57 and the circumferential position of the first groove portion 85d of the switching member 85 do not match, the cylindrical member 59 The circumferential position of the convex portion 59d and the circumferential position of the first portion 85e1 of the second groove portion 85e of the switching member 85 do not match. In other words, when the engaging portion 57b and the first groove portion 85d do not overlap when viewed in the axial direction da, the convex portion 59d and the first portion 85e1 do not overlap when viewed in the axial direction da. At this time, the pressurizing mechanism 50 (switching mechanism 90) is in a non-pressurizing state. In the non-pressurizable state, the circumferential position of the engaging portion 57b does not match the circumferential position of the first groove portion 85d. The portion 57b cannot enter the first groove portion 85d. In addition, since the circumferential position of the convex portion 59d and the circumferential position of the first portion 85e1 do not match, when the refill 30 moves backward due to the writing pressure during writing, the convex portion 59d does not move to the first portion. It is not possible to enter 85e1. As a result, in the non-pressurizable state, the refill 30 cannot fully retract when writing pressure is applied to the refill 30 during writing.

The pressurized writing instrument 10 of this embodiment includes a first display section 91 that indicates the operating state of the pressurizing mechanism 50 . The first display unit 91 provides a first display when the pressure mechanism 50 is operating, and provides a second display different from the first display when the pressure mechanism 50 is not operating. The first display portion 91 includes a first window portion 91a and a first marker 91b. In this embodiment, in the first display, at least part of the first marker 91b is visible from the outside of the barrel 20 through the first window portion 91a (see FIGS. 18 and 20), and the second display , the first marker 91b is not visible from the outside of the barrel 20 through the first window portion 91a (see FIGS. 12, 14 and 16). Note that specific aspects of the first display and the second display are not limited to this. For example, in the first display, the first marker 91b is not visible from the outside of the barrel 20 through the first window portion 91a, and in the second display, at least a portion of the first marker 91b is visible through the first window portion. It may be visually recognized from the outside of the barrel 20 via 91a. As another example, in the first display, a first color is visually recognized on the first display portion 91, and in the second display, a second color different from the first color is displayed on the first display portion 91. may be viewed.

The first window portion 91a is formed in the barrel 20 (rear barrel 26). The first window portion 91 a may be formed in the front shaft 21 . The first window portion 91a is a through hole penetrating the front shaft 21 along the radial direction. The first marker 91b is arranged inside the barrel 20 and moves back and forth integrally with the refill 30 . In the example shown in FIGS. 2 and 3, the first marker 91b is provided on the outer surface of the refill holding member 51. As shown in FIGS. Note that the first marker 91b is not limited to this, and the first marker 91b may be provided on another member that moves back and forth integrally with the refill 30 . The first marker 91b is provided so as to be visually distinguishable from the surrounding portion of the first marker 91b. For example, the first marker 91b is provided by printing on the outer surface of the refill holding member 51 using ink having a color different from the color of the portion surrounding the first marker 91b. In the illustrated example, the first marker 91b has an annular shape extending in the circumferential direction.

The first marker 91b may or may not be visually recognized from the outside of the barrel 20 through the first window portion 91a depending on its position. Specifically, when the first window portion 91a and the first marker 91b overlap, the first marker 91b is visible from the outside of the barrel 20 through the first window portion 91a. On the other hand, when the first window portion 91a and the first marker 91b do not overlap, the first marker 91b is not visible from the outside of the barrel 20 through the first window portion 91a. In the illustrated example, when the refill 30 moves back and forth so that the front-rear position of the first window portion 91a and the front-rear position of the first marker 91b at least partially coincide with each other, the first marker 91b is visually recognized from the outside of the barrel 20 through the first window portion 91a. For this reason, it is preferable that at least a portion of the barrel 20 (rear barrel 26) around the first window portion 91a is not see-through.

The pressurized writing instrument 10 of this embodiment further includes a second display section 92 that indicates the operating state of the retraction mechanism 40 . When the tip of the refill 30 protrudes from the front end opening 23 of the barrel 20 in a state where the pressurizing mechanism 50 is not operating, the second display section 92 performs the first display, indicating that the tip of the refill 30 is When it does not protrude from the front end opening 23 of the barrel 20, a second display different from the first display is provided. The second display portion 92 includes a second window portion 92a and a second marker 92b. In this embodiment, in the first display, at least part of the second marker 92b is visible from the outside of the barrel 20 through the second window portion 92a (see FIG. 14), and in the second display, the The second marker 92b is not visible from the outside of the barrel 20 through the second window portion 92a (see FIG. 12). Note that specific aspects of the first display and the second display are not limited to this. For example, in the first display, the second marker 92b is not visible from the outside of the barrel 20 through the second window portion 92a, and in the second display, at least a portion of the second marker 92b is visible through the second window portion. It may be visually recognized from the outside of the barrel 20 via 92a. As another example, in the first display, the first color is visually recognized in the second display portion 92, and in the second display, the second color different from the first color is displayed on the second display portion 92. may be viewed. In this embodiment, as will be described later, when the tip of the refill 30 protrudes from the front end opening 23 of the barrel 20, the pressurizing mechanism 50 operates so that the display on the second display portion 92 is displayed. Be changed.

The second window portion 92a is formed in the barrel 20 (rear shaft 26). The second window portion 92 a may be formed in the front shaft 21 . The second window portion 92a is a through hole penetrating the front shaft 21 along the radial direction. The second marker 92b is arranged inside the barrel 20 and moves back and forth integrally with the refill 30 . In the example shown in FIGS. 2 and 3, the second marker 92b is provided on the outer surface of the refill holding member 51. As shown in FIG. Note that the second marker 92b is not limited to this, and the second marker 92b may be provided on another member that moves back and forth integrally with the refill 30 . The second marker 92b is provided so as to be visually distinguishable from the surrounding portion of the second marker 92b. For example, the second marker 92b is provided by printing on the outer surface of the refill holding member 51 using ink having a color different from the color of the portion surrounding the second marker 92b. In the illustrated example, the second marker 92b has an annular shape extending in the circumferential direction.

The second marker 92b may or may not be visually recognized from the outside of the barrel 20 through the second window portion 92a depending on its position. Specifically, when the second window portion 92a and the second marker 92b overlap, the second marker 92b is visible from the outside of the barrel 20 through the second window portion 92a. On the other hand, when the second window portion 92a and the second marker 92b do not overlap, the second marker 92b is not visible from the outside of the barrel 20 through the second window portion 92a. In the illustrated example, when the refill 30 moves back and forth so that the front-rear position of the second window portion 92a and the front-rear position of the second marker 92b at least partially coincide with each other, the second marker 92b is visually recognized from the outside of the barrel 20 through the second window portion 92a. Therefore, it is preferable that at least a portion of the barrel 20 (rear barrel 26) around the second window portion 92a is not transparent.

In this embodiment, the first marker 91b and the second marker 92b are provided on the same member (refill holding member 51). Therefore, the first marker 91b and the second marker 92b are integrally moved back and forth. Not limited to this, the first marker 91b and the second marker 92b may be provided on different members. In this case, the first marker 91b and the second marker 92b may operate independently from each other. The first marker 91b and the second marker 92b may have the same color, or may have different colors.

In the example shown in FIGS. 2 and 3, in the example shown in FIG. 1, the second window portion 92a is arranged in front of the first window portion 91a, and the second marker 92b is located in front of the first marker. 91b is located forward. Alternatively, the second window portion 92a may be arranged behind the first window portion 91a, and the second marker 92b may be arranged behind the first marker 91b. For example, the first window portion 91 a may be provided on the front axle 21 and the second window portion 92 a may be provided on the rear axle 26 . The first window portion 91a may be provided close to the pen tip. For example, the first window portion 91 a may be provided forward of the grip member 25 . A user often writes while looking at the vicinity of the pen tip. Therefore, when the first window portion 91a is provided close to the pen tip, the user can visually recognize the first display portion 91 without significantly moving the line of sight.

Here, as shown in FIG. 3, D1 is the distance between the center of the width of the first window portion 91a along the axial direction da and the center of the width of the second window portion 92a along the axial direction da. do. Also, let D2 be the distance between the center of the width of the first marker 91b along the axial direction da and the center of the width of the second marker 92b along the axial direction da. In this embodiment, distance D1 is greater than distance D2. Therefore, when the first marker 91b and the second marker 92b are integrally moved back and forth, the timing at which the first marker 91b is visually recognized through the first window portion 91a and the timing at which the second marker 92b is viewed through the second window portion 92a. It doesn't match the timing of being visually recognized through. The details of the timing at which the first marker 91b and the second marker 92b are visually recognized will be described later.

Next, the retractable mechanism 40 of the pressurized writing instrument 10 will be described. In addition, the display of the first display section 91 and the second display section 92 related to the appearing/withdrawing operation of the pen tip will also be described. 2 and 3 show the pressurized writing instrument 10 in a state in which the ball-point pen tip 34 is retracted (retracted state). FIG. 12 is a diagram showing the first display section 91 and the second display section 92 in an immersive state. FIG. 13 shows the pressurized writing instrument 10 in a state where the ball-point pen tip 34 protrudes (protruded state). FIG. 14 is a diagram showing the first display section 91 and the second display section 92 in the projected state. The retractable mechanism 40 includes a clip 12 , an elastic member 43 , a knock body 45 and a cylinder member 70 . In particular, the retractable mechanism 40 includes the locked portion 16 of the clip 12 , the resilient member 43 , the knock body 45 and the locking portion 75 of the cylinder member 70 .

In the immersion state in which the pressing mechanism 50 is not operating, the first display section 91 performs the second display, and the second display section 92 performs the second display. As shown in FIGS. 2, 3 and 12, in the immersed state, the first marker 91b does not overlap the first window portion 91a, and the first marker 91b is positioned through the first window portion 91a. Not visible. Also, the second marker 92b does not overlap the second window portion 92a, and the second marker 92b is not visible through the second window portion 92a.

In the pressurized writing instrument 10 in the immersed state shown in FIGS. 1 and 3, when the user presses the knock body 45 forward, the tubular member 59 and the cylindrical member 59 and A cylinder member 70 fixed to the tubular member 59 moves forward. As a result, the piston member 60 , the refill holding member 51 fixed to the piston member 60 , and the refill 30 held by the refill holding member 51 move forward via the elastic member 55 . As a result, the tip of the ballpoint pen tip 34 protrudes forward from the front end opening 23 . At this time, when the locking portion 75 of the cylinder member 70 contacts the locked portion 16 of the clip 12 , the locking portion 75 lifts the locked portion 16 against the elastic force of the elastic member 18 . while moving forward. When the locking portion 75 moves further forward than the locked portion 16, the locked portion 16 contacts the outer surface of the barrel 20 (rear shaft 26) due to the resilience of the resilient member 18. As shown in FIG. When the user releases the forward pressure of the knock body 45 in this state, the cylinder member 70 is urged rearward by the resilient force of the resilient member 43 . At this time, when the engaging portion 75 of the cylinder member 70 comes into contact with the engaged portion 16 of the clip 12 from the front, the engaging portion 75 is engaged with the engaged portion 16, so that the cylinder member 70 is moved backward. movement is restricted. As described above, as shown in FIG. 13, the pressurized writing instrument 10 can be brought into the projecting state.

In the protruding state in which the pressure mechanism 50 is not operating, the first display portion 91 performs the second display, and the second display portion 92 performs the first display. As shown in FIGS. 13 and 14, in the protruded state, the first marker 91b is located forward of the first window 91a, and the first marker 91b is positioned through the first window 91a. Not visible. On the other hand, the second marker 92b overlaps the second window portion 92a, and the second marker 92b is visually recognized through the second window portion 92a. Therefore, by visually recognizing the second display portion 92, the user can determine whether the pressurized writing instrument 10 is in the recessed state or the projected state.

When the user presses the rear end of the clip 12 toward the barrel 20 (rear barrel 26) of the pressurized writing instrument 10 in the projecting state shown in FIG. It rotates about the axis 14 against the force. As a result, the engaged portion 16 of the clip 12 moves away from the barrel 20 . When the distance between the end of the locked portion 16 on the barrel 20 side and the barrel 20 becomes larger than the projection height of the locking portion 75 of the cylinder member 70 from the outer surface of the barrel 20, the resilient member 43 , the cylinder member 70 moves rearward. At this time, the cylinder member 70 pushes the engaging member 57 rearward, thereby causing the piston member 60 fixed to the engaging member 57, the refill holding member 51 fixed to the piston member 60, and the refill holding member 51 to move. The held refill 30 moves backward. As a result, the tip of the ballpoint pen tip 34 is retracted into the barrel 20 through the front end opening 23 . When the stepped portion 74 of the cylinder member 70 comes into contact with the contact portion 27 of the rear shaft 26, further rearward movement of the cylinder member 70 is restricted. As described above, the pressurized writing instrument 10 can be brought into the retracted state as shown in FIGS. Note that the specific configuration of the retractable mechanism 40 is not limited to the mechanism described above.

Next, a pressurizing method by the pressurizing mechanism 50 will be described with reference to FIGS. 13 and 15 to 20. FIG. In addition, the display of the first display section 91 and the second display section 92 related to the pressurizing operation by the pressurizing mechanism 50 will also be described. 15, 17 and 19 are diagrams for explaining the operation of the pressurizing mechanism 50. FIG. 16, 18 and 20 are diagrams showing the first display section 91 and the second display section 92 in the states of FIGS. 15, 17 and 19, respectively.

When the tip of the refill 30 protrudes from the front end opening 23 of the barrel 20 and the pressure mechanism 50 is not operating, the first display section 91 displays the second display, and the second display section 92 displays the first display. is displayed. That is, as shown in FIG. 14, in the first display portion 91, the first marker 91b is not visible through the first window portion 91a. On the other hand, in the second display portion 92, the second marker 92b is visible through the second window portion 92a.

In the present embodiment, as described above, the user rotates the knock body 45 around the central axis A to switch the pressurizing mechanism 50 (switching mechanism 90) between the pressurizable state and the pressurizable state. It is possible to switch with . In the pressurizable state (see FIGS. 5 and 10), when the user presses the pen tip, more specifically the ball of the refill 30, against a writing surface such as paper for writing, the writing pressure pushes the refill. 30 is pushed rearward relative to the barrel 20 , and the piston member 60 moves rearward against the elastic force of the elastic member 55 . At this time, the outer step portion 63c of the piston member 60 also moves rearward. That is, the outer stepped portion 63 c moves toward the inner stepped portion 71 c of the cylinder member 70 .

In the pressurizable state, the circumferential position of the engaging portion 57b of the engaging member 57 coincides with the circumferential position of the first groove portion 85d of the switching member 85, and the convex portion 59d of the cylindrical member 59 is aligned. The circumferential position coincides with the circumferential position of the first portion 85e1 of the second groove portion 85e of the switching member 85 . At this time, when the engaging member 57 retreats toward the switching member 85, the engaging portion 57b enters the first groove portion 85d. Also, the convex portion 59d enters the first portion 85e1 of the second groove portion 85e. Therefore, the retraction of the refill 30 is not hindered.

Thereafter, as shown in FIG. 15, the rear end of the piston member 60 contacts the third seal member 83, and the rear end opening 65 of the piston member 60 is sealed by the third seal member 83. As shown in FIG. At this time, a pressure chamber C sealed by the first sealing member 81, the second sealing member 82 and the third sealing member 83 is formed. The pressure chamber C includes a space behind the ink follower in the ink containing cylinder 33, an internal space of the piston member 60, a through hole 67 of the piston member 60, and a space between the outer stepped portion 63c and the inner stepped portion 71c. A formed space S is included. The space S and the through hole 67 communicate with each other through the gap between the outer surface 63 of the piston member 60 and the inner surface 71 of the cylinder member 70 .

At this time, by moving the second marker 92b rearward with respect to the second window portion 92a, as shown in FIGS. Only a portion of the rear side of the second window portion 92a is visible. At this time, in the first display portion 91, the first marker 91b is located forward of the first window portion 91a. Therefore, the first marker 91b is not visible through the first window portion 91a. That is, the first display section 91 performs the second display.

As the refill 30 moves further rearward, the outer stepped portion 63c of the piston member 60 comes closer to the inner stepped portion 71c of the cylinder member 70, as shown in FIG. At this time, the third seal member 83 moves backward against the elastic force of the elastic member 87 . When the outer stepped portion 63c approaches the inner stepped portion 71c, the volume of the space portion S is reduced. That is, the volume of the pressurization chamber C is reduced. During this time, the pressure chamber C is sealed by the first seal member 81, the second seal member 82 and the third seal member 83, so the air inside the pressure chamber C is pressurized. In other words, the pressure inside the pressurization chamber C rises. Due to the increased pressure inside the pressure chamber C, the trailing edge of the ink is pressed via the ink follower. Therefore, the amount of ink ejected from the pen tip of the pressurized writing instrument 10 increases.

At this time, by moving the second marker 92b further rearward with respect to the second window portion 92a, as shown in FIGS. , through the second window portion 92a. On the other hand, by moving the first marker 91b rearward, the first marker 91b becomes visible in a part of the front side of the first window portion 91a. That is, the first display section 91 performs the first display.

As the refill 30 moves further rearward, the outer stepped portion 63c of the piston member 60 approaches the inner stepped portion 71c of the cylinder member 70 further. As a result, the volume of the space S is further reduced, and accordingly the volume of the pressurizing chamber C is further reduced. When the resilient member 55 is further compressed, the flange portion 69 (first receiving portion 63f) of the piston member 60 comes into contact with the front end 77 of the cylinder member 70, as shown in FIG. At this time, the pressure inside the pressurizing chamber C becomes the highest. When the collar portion 69 of the piston member 60 comes into contact with the front end 77 of the cylinder member 70, the piston member 60 stops moving backward.

At this time, as the first marker 91b moves further rearward, the first marker 91b is visible in the entire first window portion 91a on the first display portion 91, as shown in FIGS. will be That is, the first display section 91 performs the first display.

When the user releases the pen tip from the writing surface, the resilient force of the resilient member 87 causes the piston member 60 to move forward together with the switching member 85 and the third seal member 83 . Further, the piston member 60 moves forward with respect to the cylinder member 70 due to the elastic force of the elastic member 55 . At this time, the rear end of the piston member 60 is separated from the third seal member 83, the sealing of the rear end opening 65 of the piston member 60 is released, and the internal space of the piston member 60 is communicated with the atmosphere. Therefore, the pressure on the trailing edge of the ink is also released. That is, the pressurized writing instrument 10 returns to the state shown in FIG. This suppresses ink from flowing out from the pen tip when the ball is not pressed against the writing surface.

At this time, as the first marker 91b moves forward, the first marker 91b becomes invisible through the first window portion 91a on the first display portion 91, as shown in FIG. That is, the first display section 91 performs the second display.

In the present embodiment, in the first display portion 91, the first marker 91b is visible from the outside of the barrel 20 through the first window portion 91a when the pressure mechanism 50 is operating. Accordingly, the user can grasp the operating state of the pressurizing mechanism 50 by visually recognizing the first display portion 91 .

Further, in the present embodiment, the second marker 92b in the second display portion 92 is axially displayed through the second window portion 92a when the retraction mechanism 40 is in operation and the pressure mechanism 50 is not in operation. It is visible from the outside of the cylinder 20, and is not visible from the outside of the barrel 20 through the second window portion 92a when the retraction mechanism 40 is operating and the pressure mechanism 50 is operating. In this case, by combining the first display portion 91 and the second display portion 92, the operation state of the pressure mechanism 50 and the operation state of the retraction mechanism 40 can be easily grasped.

As described above, when the tip of the refill 30 protrudes from the front end opening 23 of the barrel 20 and the pressure mechanism 50 is not operating, the first display portion 91 is displayed as shown in FIG. The second display is performed, and the second display section 92 performs the first display. Even in the non-pressurizable state (see FIGS. 6 and 11), when the user presses the pen tip, more specifically the ball of the refill 30, against a writing surface such as paper for writing, the pressurizable state Similarly, the refill 30 is pushed rearward relative to the barrel 20 by the writing pressure, and the piston member 60 moves rearward against the elastic force of the elastic member 55 .

In the non-pressurizable state, the circumferential position of the engaging portion 57b of the engaging member 57 and the circumferential position of the first groove portion 85d of the switching member 85 do not match. In addition, the circumferential position of the convex portion 59d of the tubular member 59 and the circumferential position of the first portion 85e1 of the second groove portion 85e of the switching member 85 do not match. At this time, even if the engaging member 57 retreats toward the switching member 85, the engaging portion 57b does not enter the first groove portion 85d. Also, the convex portion 59d does not enter the first portion 85e1 of the second groove portion 85e. In other words, when the engaging portion 57b of the engaging member 57 contacts the front end of the switching member 85, the refill 30 and the engaging member 57 stop moving backward. As a result, the switching member 85 prevents the refill 30 and the engaging member 57 from retreating.

In this case, the rear end of the piston member 60 does not contact the third seal member 83 and the rear end opening 65 of the piston member 60 is not sealed by the third seal member 83 . Therefore, since the pressure chamber C is not formed, the ink is not pressed. In this case, the amount of ink ejected from the pen tip of the pressure writing instrument 10 does not change. However, writing with the pressurized writing instrument 10 is possible even in this state.

At this time, since the refill holding member 51 is also prevented from retreating together with the refill 30, the display on the first display portion 91 and the second display portion 92 remains unchanged from the state shown in FIG. That is, the first display section 91 performs the second display, and the second display section 92 performs the first display. Specifically, in the first display portion 91, the first marker 91b is not visible through the first window portion 91a. On the other hand, in the second display portion 92, the second marker 92b is visible through the second window portion 92a.

The first display unit 91 provides a first display when the pressure mechanism 50 is operating, and provides a second display when the pressure mechanism 50 is not operating. Specifically, in the first display portion 91, when the pressure mechanism 50 is operating, the first marker 91b is displayed through the first window portion 91a as shown in FIGS. visible. On the other hand, when the pressure mechanism 50 is not operating, the first marker 91b is not visible through the first window portion 91a, as shown in FIG. Therefore, by visually recognizing the first display portion 91, the user can easily grasp whether or not the pressing mechanism 50 is operating. Note that when the pressurizing mechanism 50 is operating refers to a state in which the pressurizing mechanism 50 applies pressure to the ink in the refill 30 from behind.

The pressurized writing instrument 10 of the present embodiment includes a barrel 20, a refill 30 having an ink storage barrel 33 disposed in the barrel 20 and filled with ink, and a rear end of the ink by retracting the refill 30. and a first display section 91 that indicates the operating state of the pressure mechanism 50 .

According to such a pressurized writing instrument 10, the user can easily grasp whether or not the pressurizing mechanism 50 is operating by visually recognizing the first display portion 91. FIG. In particular, the first display unit 91 performs a first display when the pressure mechanism 50 is operating, and performs a second display different from the first display when the pressure mechanism 50 is not operating. In this case, the user can easily determine whether or not the pressing mechanism 50 is operating by visually checking whether the first display portion 91 is displaying the first display or the second display. can grasp.

Further, when the pressurizing mechanism 50 includes a switching mechanism 90 for switching the pressurizing writing instrument 10 between the pressurizing state and the pressurizing non-pressurizing state, whether the pressurizing writing instrument 10 is in the pressurizing state or the pressurizing non-pressurizing state is performed. It may be difficult for the user to grasp the state during writing. In the pressurized writing instrument 10 of the present embodiment, when the first display unit 91 displays the first display during writing, the pressurized writing instrument 10 is in a pressurizable state, and the pressurizing mechanism 50 operates. It can be seen that On the other hand, when the first display unit 91 displays the second display during writing, it can be seen that the pressurizing mechanism 50 is not operating and the pressurizing writing instrument 10 is in the non-pressurizing state.

In the pressurized writing instrument 10 of the present embodiment, the first display portion 91 includes a first window portion 91a formed in the barrel 20, and a first marker arranged in the barrel 20 and moving back and forth integrally with the refill 30. 91b and

According to such a pressurized writing instrument 10, the display on the first display section 91 can be changed by moving the refill 30 due to the writing pressure during writing. Therefore, it is not necessary to arrange an additional member for changing the display of the first display portion 91 . This makes it possible to change the display of the first display section 91 with a simple configuration.

In the pressurized writing instrument 10 of this embodiment, the first marker 91b is visible from the outside of the barrel 20 through the first window 91a when the pressurizing mechanism 50 is operating.

According to such a pressurized writing instrument 10, the user can easily grasp that the pressurizing mechanism 50 is operating.

The pressurized writing instrument 10 of this embodiment further includes a retraction mechanism 40 that retracts the tip of the refill 30 from the front end opening 23 of the barrel 20, and a second display section 92 that indicates the operating state of the retraction mechanism 40. .

According to such a pressurized writing instrument 10, the user can easily grasp whether or not the tip portion of the refill 30 protrudes from the front end opening portion 23 by visually recognizing the second display portion 92. can. In particular, the second display portion 92 displays the first display when the tip of the refill 30 protrudes from the front end opening 23, and displays the first display when the tip of the refill 30 does not protrude from the front end opening 23. A second display different from is performed. In this case, the user can determine whether the tip of the refill 30 protrudes from the front end opening 23 by visually checking whether the second display 92 is displaying the first display or the second display. can be easily grasped.

In the pressurized writing instrument 10 of the present embodiment, the second display portion 92 includes a second window portion 92a formed in the barrel 20, and a second marker arranged in the barrel 20 and moving back and forth integrally with the refill 30. 92b, and

According to such a pressurized writing instrument 10, the display on the second display section 92 can be changed by moving the refill 30 due to the writing pressure during writing. Therefore, it is not necessary to arrange an additional member for changing the display of the second display section 92 . This makes it possible to change the display of the second display section 92 with a simple configuration.

In the pressurized writing instrument 10 of the present embodiment, the second marker 92b is positioned at the second window when the tip of the refill 30 protrudes from the front end opening 23 of the barrel 20 and the pressurizing mechanism 50 is not in operation. 92a from the outside of the barrel 20, the front end of the refill 30 protrudes from the front end opening 23 of the barrel 20, and the second window 92a is visible when the pressurizing mechanism 50 is in operation. Therefore, it is not visible from the outside of the barrel 20 .

According to such a pressurized writing instrument 10, not only the display of the first display section 91 but also the display of the second display section 92 is changed according to the operation of the pressurization mechanism 50. Whether or not it is operating can be more easily grasped.

10 Pressurized writing implement 12 Clip 14 Axis 16 Engaged portion 18 Resilient member 20 Axle tube 21 Front shaft 23 Front end opening 25 Grip member 26 Rear shaft 27 Contact portion 28 Receiving portion 29 Rear end opening 30 Refill 33 Ink storage Cylinder 34 Ballpoint pen tip 43 Resilient member 45 Knock body 46 Front projecting portion 50 Pressure mechanism 51 Refill holding member 55 Resilient member 57 Engaging member 57a Body portion 57b Engaging portion 59 Cylindrical member 59a First receiving portion 59b Second Receiving portion 59c Inner collar portion 59d Protruding portion 60 Piston member 61 Inner surface 63 Outer surface 63a First large diameter portion 63b First small diameter portion 63c Outer stepped portion 63d First concave portion 63e Second concave portion 63f First receiving portion 65 Rear end opening 67 Through hole 69 Collar 70 Cylinder member 71 Inner surface 71a Second large diameter portion 71b Second small diameter portion 71c Inner stepped portion 71d Second receiving portion 73 Outer surface 74 Stepped portion 75 Locking portion 77 Front end 79 Rear end 79a Concave portion 79b Groove portion 81 First seal member 82 Second seal member 83 Third seal member 85 Switching member 85a Stepped portion 85b Collar portion 85c Receiving portion 85d First groove portion 85e Second groove portion 85e1 First portion 85e2 Second portion 87 Repulsive member 90 Switching mechanism 91 First display portion 91a First window portion 91b First marker 92 Second display portion 92a Second window portion 92b Second marker A Central axis C Pressure chamber S Space da Axial direction

Claims (6)

an axle tube;
a refill disposed within the barrel and having an ink reservoir filled with ink;
a pressurizing mechanism that applies pressure to the trailing edge of the ink by retracting the refill;
A pressurized writing instrument, comprising: a first display portion for indicating an operating state of the pressurizing mechanism. The first display unit is
a first window formed in the barrel;
2. The pressurized writing instrument according to claim 1, further comprising a first marker disposed within said barrel and moving back and forth integrally with said refill. 3. The pressurized writing instrument according to claim 2, wherein the first marker is visible from the outside of the barrel through the first window when the pressurizing mechanism is operating. a retracting mechanism for retracting the tip of the refill from the front end opening of the barrel;
The pressurized writing instrument according to any one of claims 1 to 3, further comprising a second display section for indicating an operating state of the retraction mechanism. The second display unit is
a second window formed in the barrel;
5. The pressurized writing instrument according to claim 4, further comprising a second marker disposed within said barrel and moving back and forth integrally with said refill. The second marker is
visible from the outside of the shaft cylinder through the second window when the tip protrudes from the front end opening and the pressure mechanism is not in operation,
6. The pressurized writing instrument according to claim 5, wherein said tip protrudes from said front end opening and is not visible from the outside of said barrel through said second window when said pressurizing mechanism is operating. .

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