JP2017114088A - Intrusive writing instrument - Google Patents

Abstract

Provided is a retractable writing instrument that can make a retractable mechanism simple and can reliably avoid damage to the pen nib even when a drop impact is applied with the nib side facing downward in the pen nib immersion state. A retracting mechanism includes a movable member, a knock member, a first locking hole, a second locking hole, and a biasing member. The movable member 4 is connected to the cursive body 3. Knock member 5 is accommodated inside movable member 4 so as to be movable in the front-rear direction. A locking claw portion 43 having a radial elasticity is formed on the side wall of the movable member 4. In the pen tip immersion state, the locking claw portion 43 is engaged with the first locking hole 23. In a state where the forward pressing of the knock member 5 is released in the pen tip immersion state, the radially inward displacement of the locking claw portion 43 is restricted by the restriction wall portion 54 of the knock member 5. [Selection] Figure 1

Description

The present invention relates to a retractable writing instrument.

In this kind of retractable writing instrument, for the purpose of avoiding damage to the pen tip when a drop impact is applied with the pen tip side facing down, the writing body is accommodated in the shaft cylinder so as to be movable in the front-rear direction, The projectile that urges the writing body backward is accommodated in the shaft cylinder, and the writing body is moved forward against the rear urging of the projectile body so that the pen tip of the writing body is moved to the shaft cylinder. A retractable writing instrument provided with a retractable mechanism for projecting from the front end hole, wherein an annular elastic body is disposed in the shaft cylinder, and an annular weight body is disposed in the front-rear direction behind the elastic body in the shaft cylinder The cursive body penetrates the inner hole of the elastic body and the inner hole of the weight body, and the weight body collides with the elastic body at the time of impact, so that the elastic body swells in the radial direction. A retractable writing instrument is disclosed, characterized in that an elastic body can be sandwiched between the outer surfaces of the writing body. There.

JP2012-232484A

The retractable writing instrument of Patent Document 1 is configured to utilize the fact that the weight body bulges the elastic body in the radial direction. Therefore, when a relatively weak impact is applied, the elastic body does not sufficiently bulge and deform. Since a sufficient force for holding the cursive object is not generated, the protrusion of the pen tip may not be sufficiently avoided.

The present invention solves the above-mentioned conventional problems, and can make the protruding and retracting mechanism simple, and can damage the pen tip even when a drop impact is applied with the pen tip immersed in the pen tip immersion state. It is intended to provide an in / out type writing instrument that can be reliably avoided. In the present invention, “front” refers to the pen tip side, and “rear” refers to the opposite side. In the present invention, the pen tip protruding state refers to a state in which the pen tip protrudes from the front end of the shaft cylinder, and the pen tip immersive state refers to a state in which the pen tip is immersed inside the shaft cylinder.

1st invention of this application is the axial cylinder 2, the writing body 3 accommodated in the axial cylinder 2 so that a movement in the front-back direction was carried out, and it accommodated in the axial cylinder 2 and attached the writing body 3 to back. A projecting state of the pen point 31 of the writing body 3 from the front end hole 21 of the shaft cylinder 2 by moving the writing body 3 forward against the rearward biasing of the projecting body 6 A retractable writing instrument including a movable member 4 accommodated in the shaft cylinder 2 so as to be movable in the front-rear direction, and in the movable member 4 in the front-rear direction. A knock member 5 that is movably accommodated and projects rearward from the rear end hole 22 of the shaft cylinder 2, a first locking hole 23 formed in a side wall of the shaft cylinder 2, and the first engagement Between the second locking hole 24 formed in the side wall of the shaft cylinder 2 in front of the stop hole 23, and the movable member 4 and the knock member 5. And a biasing member 7 that biases the knock member 5 rearward. The movable member 4 includes a front side wall part 41 and a cylindrical part 42 that is connected to the rear side of the front side wall part 41. The writing body 3 is connected to the front surface of the front side wall portion 41, and a locking claw portion 43 having a radial elasticity is formed on the outer surface of the side wall of the cylindrical portion 42. The portion 43 is configured to be able to be immersed in the cylindrical portion 42, and the knock member 5 includes a sliding cylindrical portion 51 and a knocking portion 52 that is connected to the rear of the sliding cylindrical portion 51, A sliding cylinder part 51 is accommodated in the cylindrical part 42 of the movable member 4 so as to be slidable in the front-rear direction, and the locking claw part 43 can be inserted into an intermediate part of the side wall of the sliding cylinder part 51. Through-hole 53 is formed, and a regulating wall portion 54 is formed on the side wall of the sliding cylinder portion 51 in front of the through-hole 53 so that the pen tip is immersed. In the state, the knock portion 52 protrudes rearward from the rear end hole 22 of the shaft cylinder 2, and in the pen tip immersion state, the locking claw portion 43 is engaged with the first locking hole 23, and the pen In the tip protruding state, the locking claw portion 43 is engaged with both the second locking hole 24 and the through hole 53, and in the transition process between the pen tip immersion state and the pen tip protruding state, The locking claw portion 43 is displaced inward in the radial direction by pressure contact with the inner surface of the side wall of the shaft tube 2 and is inserted into the through-hole 53 so as to press the knock member 5 forward in the pen tip immersion state. In the state in which the locking claw portion 43 is released, the restriction wall portion 54 of the knock member 5 is positioned radially inward of the locking claw portion 43, and displacement of the locking claw portion 43 inward in the radial direction is restricted. It is characterized by becoming.

The retractable writing instrument 1 according to the first aspect of the present invention can adopt a simple structure for the retractable mechanism by adopting the above-described configuration, and even when a drop impact is applied with the nib side facing downward in the pen nib immersion state. Can be reliably avoided.

According to a second invention of the present application, in the first retractable writing instrument 1, the locking claw portion in which the protruding and retracting mechanism is disposed radially outward of the second locking hole 24 and the pen tip protrudes. The release part 26 comprised so that 43 can be pressed to radial inside is provided, It is characterized by the above-mentioned.

The retractable writing instrument 1 according to the second aspect of the present invention can easily release the pen tip protruding state by adopting the form.

The retractable writing instrument of the present invention can have a simple structure for the retractable mechanism, and can reliably avoid damage to the pen tip even when a drop impact is applied with the pen tip side facing downward in the pen tip immersion state.

It is a longitudinal cross-sectional view which shows the pen tip immersion state of embodiment of this invention. It is a longitudinal cross-sectional view which shows the state which pushed the knock member ahead in the nib immersion state of FIG. It is a longitudinal cross-sectional view which shows the state of the transition process between the nib immersion state of FIG. 1, and a nib protrusion state. It is a longitudinal cross-sectional view which shows the pen tip protrusion state of FIG. It is a principal part perspective view of the axial cylinder of FIG. It is a perspective view of the movable member of FIG. It is a perspective view of the knock member of FIG. FIG. 2 is an exploded view of FIG. 1.

An embodiment of the present invention is shown in FIGS.
The retractable writing instrument 1 according to the present embodiment includes a shaft cylinder 2, a writing body 3 that is accommodated in the shaft cylinder 2 so as to be movable in the front-rear direction, and is accommodated in the shaft cylinder 2 and the writing body 3 is moved backward. The nib 31 of the writing body 3 is pushed from the front end hole 21 of the shaft cylinder 2 by pressing forward the bullet body 6 (for example, compression coil spring) which always urges, and the knock part 52 which protrudes from the rear end of the shaft cylinder 2. And a haunting mechanism for haunting.

The shaft tube 2 has a front end hole 21 penetrating in the front-rear direction at the front end. A first locking hole 23 and a second locking hole 24 formed in front of the first locking hole 23 are formed in the rear side wall of the shaft cylinder 2. The first locking hole 23 is formed to have a length in the front-rear direction larger than that of the second locking hole 24. A guide groove 28 (see FIG. 8) extending in the front-rear direction is formed on the inner surface of the rear side wall of the shaft cylinder 2.

-Release part On the side wall of the shaft cylinder 2, one end of a leg part 25a having flexibility in the radial direction is fixed. On the inner surface of the other end of the leg portion 25a, a protrusion-shaped release portion 26 protruding radially inward is formed. The release portion 26 is located radially outward of the second locking hole 24. The leg portion 25a constitutes a clip portion, and the release portion 26 constitutes a ball portion of the clip portion. In the present embodiment, the tail plug 25 formed integrally with the leg portion 25 a is fixed to the rear end opening of the shaft tube 2. In addition to this, the leg portion 25a may be integrally formed on the outer surface of the side wall of the shaft tube 2.

-Cursive body The cursive body 3 is a ballpoint pen refill, and a ballpoint pen tip is attached as a pen tip 31 to the front end of the ink storage tube. The ballpoint pen tip has a ball rotatably held at the front end of the tip body. Inside the ink storage tube, ink (water-based or oil-based ink) and a follower (for example, a high-viscosity fluid) filled at the rear end of the ink and moving forward as the ink is consumed are stored. A connecting portion 33 (for example, a recess) is formed on the rear end surface of the writing body 3 (for example, the rear end surface of the ink storage tube or the rear end surface of the tail plug fixed to the rear end portion of the ink storage tube).

-Bullet body The bullet body 6 comprises a compression coil spring. The front end of the bullet body 6 is locked to the contact portion 27 on the inner surface of the front end portion of the shaft cylinder 2, and the rear end of the bullet body 6 is locked to the shoulder portion 32 on the outer surface of the writing body 3.

Extrusion mechanism The retracting mechanism includes the movable member 4, the knock member 5, the first locking hole 23 on the side wall of the shaft tube 2, the second locking hole 24 on the side wall of the shaft tube 2, and biasing Member 7.

-Movable member The movable member 4 is accommodated in the rear part of the shaft cylinder 2 so as to be movable in the front-rear direction. The movable member 4 is composed of a bottomed cylindrical body whose front side is closed and opened rearward, and is obtained by a synthetic resin molded body. The movable member 4 includes a front side wall portion 41 and a cylindrical portion 42 that is integrally connected to the rear side of the front side wall portion 41. A guide protrusion 45 (see FIG. 6) extending in the front-rear direction is integrally formed on the outer surface of the tubular portion 42 of the movable member 4. The guide protrusion 45 slides in the guide groove 28 in the front-rear direction. A longitudinal groove 47 (see FIG. 8) extending in the front-rear direction is formed on the inner surface of the cylindrical portion 42 of the movable member 4.

Locking claw portion A locking claw portion 43 having a radial elasticity is integrally formed on the outer surface of the side wall of the tubular portion 42. The locking claw portion 43 is configured to be able to be immersed in the cylindrical portion 42. On the side wall of the cylindrical portion 42, a slit 44 is provided in a radial direction so as to surround the locking claw portion 43, and an elastic piece having a radial elasticity is formed. That is, the locking claw portion 43 is formed on the outer surface of the elastic piece and can be displaced inward in the radial direction with respect to the side wall of the cylindrical portion 42. On the radially outer surface of the locking claw portion 43, an inclined surface 43a (tapered surface or curved surface that approaches the axis of the shaft cylinder 2 as it goes forward) is formed. The inclined surface 43 a can contact the front inner surface of the first locking hole 23 and can contact the front inner surface of the second locking hole 24. The rear surface of the locking claw 43 can be locked to the rear inner surface of the first locking hole 23, and can be locked to the rear inner surface of the second locking hole 24.

A connected portion 46 (for example, a convex portion) that can be connected to the connecting portion 33 at the rear end portion of the writing body 3 is integrally formed on the front surface of the front side wall portion 41. The connected portion 46 is connected to the connecting portion 33 of the cursive body 3. In addition, the connection part 33 of the rear-end part of the said writing body 3 may be formed by a convex part, and the to-be-connected part 46 formed in the front surface of the said front side wall part 41 may be formed by a recessed part. As a connection structure between the connecting portion 33 and the connected portion 46, a structure (for example, screwing, engagement, etc.) in which the connection state is not released by a strong impact in the front-rear direction such as a drop impact is adopted.

-Knock member The knock member 5 is formed of a bottomed cylindrical body that is opened forward and closed on the rear side, and is obtained by a synthetic resin molded body. The knock member 5 includes a sliding cylinder portion 51 accommodated in the cylindrical portion 42 of the movable member 4 so as to be slidable in the front-rear direction, and a knock portion 52 provided continuously behind the sliding cylinder portion 51. With. In the pen tip immersion state, the knock portion 52 protrudes rearward from the rear end hole 22 of the shaft tube 2. A through-hole 53 through which the locking claw 43 can be inserted into an intermediate part of the side wall of the sliding cylinder part 51 (a position behind the front end of the sliding cylinder part 51 and forward of the rear end of the sliding cylinder part 51). Is formed. A regulating wall portion 54 is formed on the side wall of the sliding cylinder portion 51 in front of the through hole 53. A longitudinal rib 55 (see FIG. 7) extending in the front-rear direction is integrally formed on the outer surface of the side wall of the sliding cylinder portion 51. The vertical rib 55 is slid into the vertical groove 47 on the inner surface of the movable member 4. The outer diameter of the sliding cylinder portion 51 is formed larger than the inner diameter of the rear end hole 22 of the shaft cylinder 2, and the outer diameter of the knock section 52 is smaller than the inner diameter of the rear end hole 22 of the shaft cylinder 2.

Energizing member The energizing member 7 is disposed between the movable member 4 and the knock member 5. The knock member 5 is urged rearward with respect to the movable member 4 by the urging member 7. The biasing member 7 is made of, for example, a compression coil spring. The front end of the biasing member 7 is locked to the rear surface of the front side wall portion 41 of the movable member 4, and the rear end of the biasing member 7 is locked to the inner wall of the knock member 5 (inner wall of the knock portion). The The resilient force of the biasing member 7 is smaller than the resilient force of the resilient body 6 that biases the writing body 3 backward.

-Pen tip protruding process In the pen tip immersion state, the locking claw portion 43 is engaged with the first locking hole 23 (Fig. 1). When the knock portion 52 is pushed forward against the rearward urging of the urging member 7 from the pen tip immersion state, the knock member 5 first moves forward with respect to the movable member 4, and the front end of the knock member 5 Is brought into contact with the inner wall of the movable member 4 (the rear surface of the front side wall 41 of the movable member 4) (FIG. 2). At this time, the through hole 53 on the side wall of the knock member 5 is positioned radially inward of the locking claw portion 43.

Thereafter, when the knock member 5 is further pressed forward against the rear urging force of the projectile 6, the inclined surface 43 a of the locking claw 43 comes into contact with the front end edge of the first locking hole 23. In accordance with the forward movement of the knock member 5, the movable member 4 is moved forward, and the cursive body 3 is moved forward accordingly. As the movable member 4 moves forward, the locking claw portion 43 is pressed radially inward by the side wall of the shaft tube 2 and gradually displaced radially inward, so that the locking claw portion 43 is placed inside the movable member 4. It is inserted and inserted into the through hole 53. At this time, the engagement state between the locking claw portion 43 and the first locking hole 23 is released (FIG. 3).

Thereafter, when the knock member 5 is further pushed forward against the rear urging of the projectile 6, the locking claw 43 is inserted into the through hole 53 as the movable member 4 moves forward. The latching claw portion 43 moves forward. When the locking claw portion 43 reaches a position radially inward of the second locking hole 24, the locking claw portion 43 is displaced radially outward, and the locking claw portion 43 becomes the second locking hole. 24 is engaged. As a result, the pen tip protrudes (FIG. 4). In the pen tip protruding state, at the time of writing, the rear surface of the locking claw portion 43 is locked to the inner surface of the second locking hole 24, the backward movement is restricted by the writing body 3, and the pen tip protruding state is maintained. . In addition, in the pen tip protruding state, the front surface of the locking claw portion 43 is locked to the inner surface of the through hole 53.

-Canceling the pen tip protruding state When the outer surface of the leg 25a is pressed radially inward in the pen tip protruding state, the releasing portion 26 is displaced radially inward and inserted into the second locking hole 24. Is done. Thereafter, when the release portion 26 contacts the radially outer surface of the locking claw portion 43 and the release portion 26 presses the locking claw portion 43 radially inward, the locking claw portion 43 is displaced radially inward. Then, it is immersed in the movable member 4. When the locking claw portion 43 is immersed in the movable member 4, the engagement state between the locking claw portion 43 and the second locking hole 24 is released. When the engagement state between the locking claw portion 43 and the second locking hole 24 is released, the movable member 4 is moved rearward by the rearward urging of the elastic body 6, and accordingly the writing body 3 is moved rearward. Move (Fig. 3). After that, the locking claw portion 43 is engaged with the first locking hole 23, and the rear surface of the locking claw portion 43 is locked to the inner surface of the first locking hole 23 by the rear urging of the elastic body 6. The pen tip immersion state is maintained (FIG. 1).

In the pen tip immersion state at the time of a drop impact, the locking claw portion 43 is engaged with the first locking hole 23. When the forward pressing of the knock member 5 is released in this state (FIG. 1), the regulating wall portion 54 on the side wall of the knock member 5 is positioned radially inward of the locking claw portion 43, and the locking claw Displacement of the portion 43 inward in the radial direction is restricted. Thus, when a drop impact is applied with the pen tip 31 in the pen tip immersion state, the state in which the locking claw portion 43 is locked in the first locking hole 23 is maintained, and the movable member 4 is moved forward. As a result, it is possible to reliably avoid the pen tip 31 from protruding from the front end hole 21 of the shaft tube 2.

In the retractable writing instrument 1 of the present embodiment, the retracting mechanism is accommodated in the shaft cylinder 2 so as to be movable in the front-rear direction, and accommodated in the movable member 4 so as to be movable in the front-rear direction. A knock member 5 that protrudes rearward from the rear end hole 22 of the shaft cylinder 2, a first locking hole 23 formed in the side wall of the shaft cylinder 2, and the first locking hole 23. A second locking hole 24 formed in the side wall of the front shaft cylinder 2, and a biasing member 7 disposed between the movable member 4 and the knocking member 5 and biasing the knocking member 5 backward. The movable member 4 includes a front side wall part 41 and a cylindrical part 42 connected to the rear side of the front side wall part 41, and the cursive body 3 is connected to the front surface of the front side wall part 41. A locking claw portion 43 having a radial elasticity is formed on the outer surface of the side wall of the cylindrical portion 42, and the locking claw portion 4 The knock member 5 includes a sliding cylinder portion 51 and a knock portion 52 that is connected to the rear of the sliding cylinder portion 51, and the sliding member A cylindrical portion 51 is accommodated in the cylindrical portion 42 of the movable member 4 so as to be slidable in the front-rear direction, and a through-hole through which the locking claw portion 43 can be inserted in an intermediate portion of the side wall of the sliding cylindrical portion 51. A hole 53 is formed, a regulating wall portion 54 is formed on the side wall of the sliding cylinder portion 51 in front of the through-hole 53, and the knock portion 52 is located behind the rear end hole 22 of the shaft cylinder 2 in the pen insertion state. In the pen tip immersion state, the locking claw portion 43 is engaged with the first locking hole 23, and in the pen tip protruding state, the locking claw portion 43 is engaged with the second locking hole. 24 and the penetrating hole 53 are engaged, and the transition between the pen tip immersing state and the pen tip protruding state is excessive. Thus, the locking claw portion 43 is displaced inward in the radial direction by pressure contact with the inner surface of the side wall of the shaft tube 2 and is inserted into the through-hole 53 so that the knocking member 5 is moved forward in the pen tip immersion state. In the state where the pressure is released, the restriction wall portion 54 of the knock member 5 is positioned radially inward of the locking claw portion 43, and the displacement of the locking claw portion 43 inward in the radial direction is restricted. In addition, the retracting mechanism can be simplified, and damage to the nib can be reliably avoided even when a drop impact is applied with the nib side facing downward in the nib immersion state.

In the retractable writing instrument 1 according to the present embodiment, the retracting mechanism is arranged radially outward of the second locking hole 24 and the locking claw portion 43 in the protruding state of the pen tip is radially inward. By providing the release portion 26 configured to be pressable, the pen tip protruding state can be easily released.

DESCRIPTION OF SYMBOLS 1 Retractable writing instrument 2 Shaft cylinder 21 Front end hole 22 Rear end hole 23 First locking hole 24 Second locking hole 25 Tail plug 25a Leg part 26 Release part 27 Contact part 28 Guide groove 3 Writing body 31 Pen tip 32 shoulder portion 33 connecting portion 4 movable member 41 front side wall portion 42 cylindrical portion 43 locking claw portion 43a inclined surface 44 slit 45 guide protrusion 46 connected portion 47 longitudinal groove 5 knock member 51 sliding cylinder portion 52 knock portion 53 Through-hole 54 Restriction wall 55 Vertical rib 6 Bullet 7 Energizing member

Claims (2)

A shaft cylinder, a writing body accommodated in the shaft cylinder so as to be movable in the front-rear direction, a projecting body accommodated in the shaft cylinder and biasing the writing body rearward, and a rear side of the projecting body A retractable writing instrument provided with a retracting mechanism that causes the pen tip of the cursive body to protrude from the front end hole of the shaft cylinder by moving the cursive body forward against the biasing force,
The haunting mechanism is
A movable member housed in the shaft cylinder so as to be movable in the front-rear direction;
A knock member housed in the movable member so as to be movable in the front-rear direction and projecting rearward from a rear end hole of the shaft cylinder;
A first locking hole formed in a side wall of the shaft tube;
A second locking hole formed in the side wall of the shaft cylinder in front of the first locking hole;
An urging member disposed between the movable member and the knock member and urging the knock member backward;
The movable member includes a front side wall part and a cylindrical part connected to the rear side of the front side wall part, the cursive body is connected to a front surface of the front side wall part, and an outer surface of the side wall of the cylindrical part. A locking claw portion having a radial elasticity is formed, and the locking claw portion is configured to be immersible inside the cylindrical portion,
The knock member includes a sliding cylinder part and a knock part connected to the rear of the sliding cylinder part, and the sliding cylinder part slides in the front-rear direction inside the cylindrical part of the movable member. A through hole into which the locking claw portion can be inserted is formed in the middle portion of the side wall of the sliding cylinder portion,
A regulating wall portion is formed on the side wall of the sliding cylinder portion in front of the through hole,
In the pen tip immersion state, the knock portion protrudes rearward from the rear end hole of the shaft tube,
In the pen tip immersion state, the locking claw portion is engaged with the first locking hole,
In the pen tip protruding state, the locking claw portion is engaged with both the second locking hole and the through hole,
In the transition process between the pen tip immersion state and the pen tip protruding state, the locking claw portion is displaced inward in the radial direction by pressure contact with the inner surface of the side wall of the shaft tube and is inserted into the through hole. ,
In the state where the forward pressing of the knock member is released in the pen tip immersion state, the restriction wall portion of the knock member is positioned radially inward of the locking claw portion, and the radial direction of the locking claw portion An intrusive writing instrument characterized in that inward displacement is restricted. 2. The disengaging mechanism includes a release portion that is arranged radially outward of the second locking hole and configured to be able to press the locking claw portion in a pen tip protruding state radially inward. The haunting type writing instrument described.

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