JP7220630B2 - writing instrument - Google Patents

Description

The present invention relates to writing instruments.

2. Description of the Related Art Conventionally, there has been known a rotary operation type writing instrument in which a writing body supported in a barrel is protruded and retracted from an opening at the front end of the barrel by rotating the head crown relative to the barrel around the axis of the barrel. (see Patent Document 1). Such a writing instrument has a quiet operation sound and excellent operational feeling because the retractable operation is realized by the internal rotation mechanism. On the other hand, in a rotary operation type writing instrument, generally, one hand grips the barrel, the other hand grips the crown of the head, and rotates relative to the barrel around the axis to perform the appearance and retraction operation of the pen. For this reason, there is room for improvement in operability, because it takes a little time to perform the projecting operation even when it is desired to write by quickly projecting the writing material.

On the other hand, for example, by pushing a knock member protruding outside from an opening at the rear end of the barrel forward into the barrel, the writing body supported in the barrel is protruded from the opening at the front end of the barrel. , a knock-type writing instrument is also known. A knock-type writing instrument can be operated quickly because it can be operated with one hand. , There is room for improvement in the feeling of operation, such as a clicking sound when knocking.

Japanese Patent Application Laid-Open No. 2007-320209

The present invention was invented in view of the above circumstances. That is, an object of the present invention is to provide a writing instrument that achieves both operability and operational feeling.

A writing instrument according to the present invention comprises a barrel,
A writing body supported by the barrel so as to be movable relative to the barrel in its axial direction, and rebounded backward by an elastic body arranged in the barrel, and having a pen tip appearing and disappearing from the front end of the barrel. and,
a middle cylinder provided with an elongated hole extending along the axial direction and an inward stepped portion formed behind the elongated hole, and arranged inside the axial cylinder;
a rotary body provided with a slit extending spirally around the axis, disposed in the shaft cylinder so as to be rotatable relative to the shaft cylinder about the axis, and housed inside the middle cylinder;
a pressing portion having a moving portion that moves in the elongated hole and the slit, the pressing portion being capable of relative movement in the axial direction with respect to the shaft cylinder, but restricted in relative rotation about the axis;
urging means for urging the rotating body in the axial direction with respect to the shaft cylinder to press the shoulder of the rotating body against the shoulder of the middle cylinder;
a crown attached to the rear end of the rotating body extending outward from the rear end of the middle cylinder;
The pressing portion can press against the barrel from the outside of the barrel,
a front end surface of the shoulder portion of the middle cylinder and a rear end surface of the shoulder portion of the rotating body are connected via high-viscosity grease,
A gap is formed between the head crown and the barrel, and when the pressing portion is advanced, the gap is reduced, and the front end surface of the shoulder portion of the middle barrel and the shoulder portion of the rotating body are separated. A writing instrument having a gap between the rear end surface and the

According to the writing instrument of the present invention, a simple retraction operation with one hand and a quiet and smooth retraction operation are realized, so that both operability and operational feeling are achieved, and further, from the state where the pen tip is protruding, is repulsed backward by the elastic body and the pen tip is retracted, high-viscosity grease interposed between the front end surface of the shoulder portion of the middle cylinder and the rear end surface of the shoulder portion of the rotating body, The urging means for urging the shoulder portion of the rotating body toward the shoulder portion of the middle cylinder causes the rotating body to rotate slowly, so that the impact on the writing body is alleviated, and the crown is synchronized with the rotating body. It rotates smoothly and you can enjoy the rotating motion, and when moving the pressing part forward, a gap is created between the front end face of the shoulder of the middle cylinder and the rear end face of the shoulder of the rotating body. Therefore, the pen tip can be protruded while rotating the rotating body without being affected by the grease.

1 is a schematic vertical cross-sectional view showing a writing instrument according to an embodiment of the present invention, in which the pen tip is immersed; FIG. FIG. 2 is a rear enlarged view of FIG. 1; FIG. 2 is a partially enlarged view of FIG. 1; 1 is a schematic vertical cross-sectional view showing a writing instrument according to an embodiment of the present invention, in which the nib protrudes; FIG. FIG. 5 is a rear enlarged view of FIG. 4; FIG. 2 is a schematic side view showing a middle cylinder of the writing instrument of FIG. 1; 7A is a front view of the rotating body of FIG. 1, and FIG. 7B is a front view of the rotating body of FIG. 4. FIG. 1, FIG. 8A is a longitudinal sectional view along line 7A-7A of FIG. 7A, and FIG. 8B is a longitudinal sectional view along line 7B-7B of FIG. 7B. Figure 8B is a schematic exploded view of the rotating body cut along line C of Figure 8B; 8B is an enlarged view showing the vicinity of the front end of the rotating body; FIG. 10A is an enlarged view showing the vicinity of the front end of the front wall portion of the rotating body; FIG. 10B is an enlarged view showing the vicinity of the front end of the rear wall portion of the rotating body; is. It is a figure for demonstrating the effect|action of the writing instrument of FIG. 1, and has shown the state in which the writing body was retracted in the barrel. It is a figure for demonstrating the effect|action of the writing instrument of FIG. 1, and has shown the state which the writing body is relatively moving to the front with respect to a barrel. It is a figure for demonstrating the effect|action of the writing instrument of FIG. 1, and has shown the state in which the writing body protruded from the barrel. It is a figure for demonstrating the effect|action of the writing instrument of FIG. 1, and has shown the state which the writing body is relatively moving back with respect to a barrel. It is a figure for demonstrating the effect|action of the writing instrument of FIG. 1, and is an enlarged rear view of the state which makes the writing body protrude from the barrel. It is a figure for demonstrating the effect|action of the writing instrument of FIG. 1, and is a partially enlarged view of the state which makes the writing body protrude from the barrel.

An embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

FIG. 1 is a schematic vertical cross-sectional view showing a writing instrument according to an embodiment of the present invention, in which the pen tip is immersed. However, the cursive 20 is shown in a side view. 2 is a rear enlarged view of FIG. 1, and FIG. 3 is a partially enlarged view of FIG. FIG. 4 is a schematic vertical cross-sectional view showing a writing instrument according to an embodiment of the present invention, with the pen tip protruding. However, as in FIG. 1, writing 20 is shown in side view. 5 is a rear enlarged view of FIG. 4. FIG. 6 is a schematic side view showing the inner cylinder of the writing instrument of FIG. 1; FIG. 7 is a schematic front view showing the rotating body of the writing instrument of FIG. 1, FIG. 7A is a front view of the rotating body of FIG. 1, and FIG. 7B is a front view of the rotating body of FIG. . 8 is a schematic longitudinal sectional view of the rotating body of the writing body of FIG. 1, FIG. 8A is a longitudinal sectional view along line 7A-7A of FIG. 7A, and FIG. 8B is a longitudinal sectional view along line 7B-7B of FIG. 7B. . 9 is a schematic exploded view of the rotating body cut along line 8C of FIG. 8. FIG. FIG. 9 is a schematic exploded view of the rotating body cut along line C of FIG. 8B. 10 is an enlarged view showing the vicinity of the front end of the rotor in FIG. 8B, FIG. 10A is an enlarged view showing the vicinity of the front end of the front wall of the rotor, and FIG. 10B is the vicinity of the front end of the rear wall of the rotor. is an enlarged view showing the.

As shown in FIGS. 1 and 7, the writing instrument 100 includes a barrel 10, a writing body 20 supported by the barrel 10, and a writing body 20 arranged in the barrel 10 and spirally arranged around an axis L of the barrel 10. It has a rotating body 30 provided with an extending slit 33s and a pressing portion 40 having a moving portion 41 that moves within the slit 33s. In the example shown in FIG. 1, the writing instrument 100 is a fountain pen, but it is not limited to this, and in other examples, it may be various writing instruments such as a ballpoint pen, a mechanical pencil, and a marker. As shown in FIG. 1, the writing body 20 is supported by the barrel 10 so as to be movable relative to the barrel 10 in the axial direction da. It is designed to appear and disappear from the part 10a.

As shown in FIG. 1 , the barrel 10 has a barrel body 13 and a middle barrel 11 disposed inside the barrel body 13 . As shown in FIG. 2, the middle cylinder 11 is formed with a long hole 12 extending along the axial direction da. FIG. 6 shows the middle cylinder 11 viewed from the left side of FIG. As shown in FIG. 2, the long hole 12 has a width that can accommodate the moving portion 41 of the pressing portion 40, and is provided symmetrically with respect to the axis L. As shown in FIG.

As shown in FIGS. 7 to 9, the rotating body 30 is a cylindrical member arranged in the barrel 10 so as to be rotatable about its axis L relative to the barrel 10 . The rotating body 30 has a cylindrical rotating body main body 33, and a front wall portion 31 and a rear wall portion 32 extending in opposition to each other and defining two slits 33s. The two slits 33s spirally extend from the rear end 33r of the rotary body 33 toward the front end 33f around the axis L (see FIG. 1) with a phase difference of 180° from each other. As shown in FIG. 8, each slit 33s extends forward (downward in FIG. 8) from the vicinity of the rear end 33sr of the slit 33s with a substantially uniform inclination.

On the other hand, each slit 33 s has a different inclination in a region near the front end 33 f of the rotating body main body 33 . FIG. 10A is an enlarged view showing the vicinity of the front end of the front wall portion 31 of the slit 33s of the rotor 30 shown in FIG. 8B. As shown in FIG. 10A, the front wall portion 31 has a bulging portion 31e that bulges rearward (to the right in FIG. 10A) near the front end 33sf of the slit 33s. As shown in FIG. 10A, the front wall portion 31 has an acute angle (0° <θ1<θ2<90°).

FIG. 10B is an enlarged view showing the vicinity of the front end of the rear wall portion 32 of the rotor 30 shown in FIG. 8B. As shown in FIG. 10B, the rear wall portion 32 of each slit 33s is formed with a detent portion 32e protruding forward in the vicinity of the front end. The rear wall portion 32 has a shape in which the angle formed by tangent lines SE3 and SE4 on the front and rear sides of the curved detent portion 32e and a vector directed rearward along the axial direction da changes from an obtuse angle θ3 to an acute angle θ4. have.

Returning to FIG. 1 , the rear end of the writing body 20 abuts against the pressing portion 40 so that the rearward relative movement of the writing body 20 with respect to the barrel 10 is restricted. The writing body 20 is urged rearward with respect to the barrel 10 by a coil spring 50 . As shown in the figure, the coil spring 50 includes a barrel-side engaging portion 14 provided on the inner surface of the barrel main body 13 and a writing-body side spring provided on the writing body 20 behind the barrel-side engaging portion 14 . It is arranged in a compressed state between the locking portion 22 and the.

As shown in FIG. 1 , the pressing portion 40 extends outward from the rear end of the barrel 10 and can be pressed forward from the outside of the barrel 10 . The pressing portion 40 is disposed in the middle cylinder 11 so as to pass through the rotor 30 in the axial direction da, and is movable relative to the shaft cylinder 10 in the axial direction da. The moving portion 41 of the pressing portion 40 penetrates both of the two slits 33 s of the rotating body 30 in the radial direction, and both ends of the moving portion 41 are positioned within the elongated holes 12 of the middle tube 11 . A rear end portion 35 of the rotating body 30 extends outside from the rear end of the middle cylinder 11, and a crown 34 having one projection 34a on the outer surface is attached to the rear end portion 35. As shown in FIG. The head crown 34 is fitted to the rear end of the rotating body 30 to restrict forward relative movement with respect to the rotating body 30 . As shown in FIG. 2, a gap SU1 is provided between a forward stepped portion 34b formed in the crown 34 and the rear end portion 10b of the barrel main body 13, and the crown 34 is forwardly facing. It can move forward until the stepped portion 34b and the rear end portion 10b of the barrel main body 13 come into contact with each other.

As shown in FIG. 2, the writing instrument 100 further includes a braking portion 60 that reduces the rotational speed of the rotating body 30 when it rotates about the axis L relative to the barrel 10 . The braking portion 60 includes a contact member 62 that contacts the rotating body 30 and a biasing means 61 that biases the contact member 62 against the shaft cylinder 10 in the axial direction da and presses it against the rotating body 30 . have. The contact member 62 is restricted from rotating relative to the shaft tube 10 around the axis L. As shown in FIG. The biasing means 61 is arranged in a compressed state between the barrel 10 (barrel main body 13 ) and the contact member 62 . That is, the biasing means 61 is arranged in front of the rotating body 30 and biases the contact member 62 from the front, so that the rotating body 30 is biased rearward of the barrel 10 via the contact member 62 . Thus, the shoulder portion 30a of the rotating body 30 is urged toward the shoulder portion 11a of the middle cylinder 11. As shown in FIG.

Although not shown, high-viscosity grease is applied between the shoulder portion 11a of the middle cylinder 11 and the shoulder portion 30a of the rotating body 30. As shown in FIG. This high-viscosity grease has a viscosity of 1000 mm ² /s or more and 10000 mm ² /s or less, and the biasing means 61 biases the shoulder 30 a of the rotating body 30 against the shoulder 11 a of the middle cylinder 11 . Thus, the rotational speed of the rotating body 30 can be damped. The shoulder portion 11a of the middle cylinder 11 protrudes radially at the intermediate portion of the middle cylinder 11, and the shoulder portion 30a of the rotating body 30 protrudes radially at the intermediate portion of the rotating body 30. As shown in FIG. The middle cylinder 11 and the rotating body 30 are formed with a large diameter in the front and a small diameter in the rear with the shoulder portion 11a and the shoulder portion 30a as a boundary. The biasing means 61 is a coil spring, and in a state in which the elastic force thereof is smaller than that of the coil spring 50 that biases the writing body 20 backward, the rearward stepped portion 15 provided on the inner surface of the barrel main body 13 and the contact member 62 , and when the pressing portion 40 is pressed forward, the pressing portion 40 and the writing body 20 are moved forward while the coil spring, which is the biasing means 61, contracts.

Further, as shown in FIG. 3, annular grooves 30c1 and 30c2 are formed in the center of the rear end surface 30b of the shoulder portion 30a of the rotor 30, and a stepped portion 30d is formed in the outer edge of the rear end surface 30b. . By filling the grooves 30c1 and 30c2 and the step portion 30d with grease, it is possible to prevent the grease from discontinuing. The grooves 30c1 and 30c2 have a V-shaped cross section to facilitate filling with grease. .1 mm deep and formed of concentric circles.

Furthermore, a storage recess 30e and a storage recess 30f for storing grease are formed on the outer surface of the rotor 30. A storage recess 30e formed in the large diameter portion of the rotor 30 and a storage recess 30e formed in the small diameter portion Since the grease is stored inside the concave portion 30f, the grease does not connect the inner surface of the middle tube 11 and the outer surface of the rotating body 30. As a result, the grease adhering to the outer surface of the rotating body 30 is prevented does not affect the rotation speed of the rotating body 30 . Since the grease that brakes the rotational speed of the rotating body 30 is limited to the grease between the shoulder portion 30a of the rotating body 30 and the shoulder portion 11a of the middle cylinder 11, the force that brakes the rotation of the rotating body 30 is is easy to set and stable. As a result, even if the grease applied to the inner wall surface of the slit 33 s to improve the slidability of the moving part 41 flows out to the outer surface of the rotating body 30 , it does not enter the inside of the storage recess 30 e of the rotating body 30 . Since the grease is stored, the grease does not affect the rotational speed of the rotor 30 .

Next, the operation of the writing instrument 100 as described above will be described with reference to FIGS. 9 and 11A to 11D. FIG. 9 is a schematic exploded view of the body of revolution, cut along line C of FIG. 8B, showing slits at 90 degree intervals on the centerline and 270 degrees of rotation; . 10 is an enlarged view showing the vicinity of the front end of the rotor in FIG. 8B, FIG. 10A is an enlarged view showing the vicinity of the front end of the front wall of the rotor, and FIG. 10B is the vicinity of the front end of the rear wall of the rotor. is an enlarged view showing the.

11A to 11D are diagrams for explaining the action of the writing instrument 100 of FIG. It is the figure which overlapped and showed the position of the long hole 12 of the middle cylinder 11. FIG. 11A shows a state in which the writing body 20 is retracted into the barrel 10, FIG. 11B shows a state in which the writing body 20 is moving forward relative to the barrel 10, and FIG. FIG. 11D shows a state in which the writing body 20 is moved rearward relative to the barrel 10. FIG.

Here, as shown in FIG. 11A, the description will be made with the state in which the pen point 21 of the writing body 20 is completely retracted into the barrel 10 as the initial state. In this initial state, the moving portion 41 of the pressing portion 40 is positioned at the rear end of each of the slit 33 s of the rotating body 30 and the long hole 12 of the middle tube 11 . This state is maintained by the coil spring 50 urging the writing body 20 backward against the barrel 10 .

In the writing instrument 100, when the pressing portion 40 is pressed forward against the barrel 10 with a force F (see FIG. 11B) from the state shown in FIG. 11A, the moving portion 41 presses the front wall portion 31 of the rotating body 30 forward. do. Due to this pressing force, opposite forces act on the front wall portion 31 and the moving portion 41 in directions perpendicular to the inclination of the front wall portion 31 . Therefore, these forces include a component in the axial direction da of the barrel 10 and a component in a direction orthogonal to the axial direction da. By the way, both ends of the moving part 41 are positioned in the elongated holes 12 of the middle cylinder 11 , so that they are restricted from rotating about the axis L relative to the middle cylinder 11 . Therefore, as shown in FIG. 11B , the moving portion 41 moves forward relative to the shaft tube 10 along the long hole 12 without rotating relative to the shaft tube 10 . As a result, the rotating body 30 is rotated counterclockwise relative to the barrel 10 as viewed from the rear, and the writing body 20 is moved forward relative to the barrel 10 while compressing the coil spring 50 . The head crown 34 is also rotated about the axis L relative to the barrel 10 as the rotating body 30 rotates relative to the barrel 10 (see FIG. 11B).

The force required to move the pressing portion 40 forward relative to the barrel 10 is the resultant force of the reaction force received by the moving portion 41 from the front wall portion 31 of the rotating body 30 and the biasing force of the coil spring 50. . Since the inclination of the front wall portion 31 of the rotating body 30 is constant until the moving portion 41 of the pressing portion 40 reaches the bulging portion 31 e of the rotating body 30 , the moving portion 41 moves from the front wall portion 31 of the rotating body 30 . The reaction force received by the portion 41 is substantially constant regardless of the relative positional relationship between the rotating body 30 and the pressing portion 40 . On the other hand, the biasing force of the coil spring 50 increases at a constant rate as the pressing portion 40 moves forward relative to the barrel 10 . As described above, the force required to move the pressing portion 40 forward relative to the barrel 10 increases at a constant rate. The coil spring, which is the urging means 61 that always urges the rotating body 30 rearward, operates when the force required to move the pressing portion 40 forward is minimal, that is, when the writing body 20 is in the barrel as shown in FIG. 11A. 10, when the pressing portion 40 is pressed forward with force F (see FIG. 11B) against the barrel 10, the moving portion 41 presses the front wall portion 31 of the rotating body 30 forward, While the coil spring, which is the biasing means 61, is contracted, the pressing portion 40 and the writing body 20 are advanced, and the pen tip 21 is protruded. At this time, as shown in FIGS. 12 and 13, the head crown 34 advances until the forward stepped portion 34b and the rear end portion 10b of the barrel main body 13 abut against each other, thereby creating a gap SU1 (see FIG. 13). 2) is eliminated, and a clearance SU2 corresponding to the clearance SU1 is formed between the shoulder portion 30a of the rotating body 30 and the shoulder portion 11a of the middle cylinder 11. As shown in FIG. As a result, when the pressing body 40 is pressed forward, the grease between the shoulder portion 30a of the rotating body 30 and the shoulder portion 11a of the middle cylinder 11 does not brake the rotation of the rotating body 30. It is easy to move the body 40 forward, and the operability is good.

When the moving portion 41 of the pressing portion 40 reaches the bulging portion 31e of the rotating body 30, the inclination of the front wall portion 31 of the rotating body 30 rises with respect to the axis L (see FIG. 10A). Therefore, the ratio of the component force acting to relatively rotate the rotating body 30 about the axis L with respect to the shaft tube 10 in the force acting on the front wall portion 31 of the rotating body 30 from the moving portion 41 decreases. . In other words, in order to continuously rotate the rotating body 30 relative to the barrel 10 around the axis L, it is necessary to apply a greater pressing force to the pressing portion 40 . That is, when the moving portion 41 of the pressing portion 40 reaches the bulging portion 31e of the rotating body 30, the user pressing the pressing portion 40 is provided with a heavy operational feeling.

Then, when the moving portion 41 of the pressing portion 40 gets over the top of the bulging portion 31e of the rotating body 30, the inclination of the front wall portion 31 becomes flatter with respect to the axis L (see FIG. 10A). Therefore, of the force acting on the front wall portion 31 of the rotating body 30 by the moving portion 41, the ratio of the component force acting to rotate the rotating body 30 relative to the shaft tube 10 around the axis L increases. . In other words, in order to continue rotating the rotating body 30 relative to the barrel 10 about the axis L, it is sufficient to apply a smaller pressing force to the pressing portion 40 . That is, when the moving portion 41 of the pressing portion 40 gets over the top of the bulging portion 31e of the rotating body 30, the user pressing the pressing portion 40 is provided with a light operational feeling. As described above, the user is provided with a click feeling just before the moving portion 41 of the pressing portion 40 is positioned at the front end 33sf of the slit 33s.

With this click feeling, the user perceives that the writing body 20 has moved relative to the barrel 10 to the frontmost position. Then, when the pressing force F acting on the pressing portion 40 is released, the writing body 20 is urged rearward with respect to the barrel 10 by the urging force of the coil spring 50 . As a result, the moving portion 41 of the pressing portion 40 is moved rearward relative to the barrel 10 and pressed against the rear wall portion 32 of the rotating body 30 (see FIG. 11C). At this time, the detent portion 3e of the rotating body is positioned at a position advanced clockwise around the axis L relative to the moving portion 41 as viewed from the rear. As described above, since a part of the detent portion 32e forms an obtuse angle θ3 with the vector directed rearward along the axial direction da (see FIG. 10B), the biasing force of the coil spring 50 causes the moving portion 41 to rotate. Even if the rear wall portion 32 of the body 30 is pushed rearward, the rotating body 30 is not rotated about the axis L relative to the barrel 10 .

By the above operation, the operation of projecting the writing body 20 from the front end of the barrel 10 is completed. Then, the user grips the barrel 10 and moves the barrel 10 as desired while bringing the pen tip 21 into contact with the paper surface to perform writing.

When writing is completed, the crown 34 is rotated clockwise relative to the barrel 10 by the user when viewed from behind. At this time, the rotating body 30 is rotated about the axis L relative to the barrel 10 together with the crown 34, and the detent portion 32e of the rotating body 30 presses the moving portion 41 of the pressing portion 40 forward against the barrel 10. . As a result, while the writing body 20 compresses the coil spring 50, the moving part 41 gets over the detent part 32e. After the moving part 41 gets over the detent part 32e, the writing body 20 is moved rearward relative to the barrel 10 by using the biasing force of the coil spring 50 as a driving force, and the pressing part 40 in contact with the writing body 20 moves toward the shaft. It is moved rearward relative to the cylinder 10 . Therefore, the user need not continue to rotate the crown 34 clockwise. When the pressing portion 40 moves relative to the barrel 10 , the moving portion 41 rotates the rotating body 30 clockwise relative to the barrel 10 as viewed from the rear, and rotates along the elongated hole 12 of the middle barrel 11 . It moves rearward relative to the cylinder 10 (see FIG. 11D). This relative movement continues until the moving portion 41 reaches the rear end 33sr of the slit 33s, thereby restoring the initial state shown in FIG. 11A.

Also, in the writing instrument 100, the rotational speed of the relative rotation of the rotating body 30 with respect to the barrel 10 around the axis L is reduced by the frictional force acting on the contact portion between the rotating body 30 and the contact member 62. FIG. That is, when writing with the writing instrument 100 is completed and the user rotates the crown 34 relative to the barrel 10 in a counterclockwise direction as viewed from the rear, the rotating body 30 moves along the shaft. It is rotated about the axis L relative to the cylinder 10 . When the moving part 41 of the pressing part 40 gets over the detent part 32e of the rotating body 30, the writing body 20 is moved backward relative to the barrel 10 by the biasing force of the coil spring 50 as described above. , the pressing portion 40 in contact with the writing body 20 rotates the rotating body 30 relative to the barrel 10 about the axis L and moves backward relative to the barrel 10 . During this relative movement, biasing means 31 biases the rotating body 30 rearward with respect to the barrel 10 and biases the shoulder portion 30a of the rotating body 30 toward the shoulder portion 11a of the middle cylinder 11; The grease between the shoulder portion 30a of the body 30 and the shoulder portion 11a of the middle tube 11 causes the rotating body 30 and the crown 34 attached to the rear end portion 35 of the rotating body 30 to move relatively slowly into the barrel 10. Since the pressing portion 40 relatively rotates about the axis L, the pressing portion 40 returns to the initial state shown in FIG. 1 relatively slowly. With a writing instrument such as a fountain pen, this appears to be a high-class rotating motion.

Note that the pen tip 21 of the writing instrument 20 can be protruded from the barrel 10 also by rotating the crown 34 relative to the barrel 10 around the axis L of the writing instrument 100 . In this case, in the initial state shown in FIG. 11A, when the head crown 34 is rotated counterclockwise about the axis L with respect to the barrel 10 as viewed from the rear, the moving portion 41 moves toward the rear wall portion 32 of the rotating body 30. It moves forward in the elongated hole 12 of the middle tube 11 by the force received from. As a result, the writing body 20 moves forward relative to the barrel 10 while compressing the coil spring 50 , and the nib 21 gradually protrudes from the barrel 10 . Thus, when the writing body 20 is protruded from the front end of the barrel 10 by rotating the crown 34 , the rear wall portion 32 of the rotating body 30 presses the moving portion 41 . Therefore, here, unlike the case of the pressing operation of the pressing portion 40 described above, interaction between the front wall portion 31 of the rotating body 30 and the moving portion 41 does not occur.

Immediately before the moving portion 41 of the pressing portion 40 reaches the front end 33sf of the slit 33s of the rotating body 30, the moving portion 41 climbs over the detent portion 32e. As a result, as described above, even if the moving portion 41 pushes the rear wall portion 32 of the rotating body 30 rearward due to the biasing force of the coil spring 50, the moving portion 41 moves rearward relative to the barrel 10. There is nothing to lose. That is, the pen point 21 of the writing body 20 is stably maintained in a state of protruding from the barrel 10 . When writing is finished and the pen tip 21 of the writing body 20 is retracted into the barrel 10, the procedure is the same as that described with reference to FIGS. 11C and 11D, so description thereof will be omitted here.

Further, the rotating body 30 can be rotated from the outside of the barrel 10 via the crown 34, and when the rotating body 30 is rotated relative to the barrel 10 around the axis L, the moving portion 41 of the pressing portion 40 moves. When the rotating body 30 is moved relative to the barrel 10 in the axial direction da and the pressing portion 40 is pushed forward with respect to the barrel 10 , the rotor 30 rotates about the axis L relative to the barrel 10 . As a result, the pen tip 21 of the writing body 20 can be moved to the barrel 10 by both the forward pressing operation of the pressing portion 40 with respect to the barrel 10 and the rotating operation about the axis L of the rotating body 30 via the crown 34 . can protrude from

Further, the rotating body 30 has a front wall portion 31 and a rear wall portion 32 extending oppositely to each other to define a slit 33s, the front wall portion 31 bulging rearward in the vicinity of the front end 33sf of the slit 33s. It has a protruding bulging portion 31e. As a result, when the pressing portion 40 is pushed forward with respect to the barrel 10 and the pen tip 21 of the writing body 20 is projected from the barrel 10, the user is provided with an appropriate click feeling.

That is, according to the writing instrument 100 of the present invention, the writing body 20 can be quietly and smoothly projected and retracted from the barrel 10 by a simple one-handed operation. A quiet and smooth operation feeling is provided when the body 20 is projected and retracted from the barrel 10.例文帳に追加Furthermore, when the writing body 20 is projected and retracted from the barrel 10, especially when the writing body 20 is retracted into the barrel 10 and the rear end 33sr of the slit 33s abuts against the moving part 41, a strong impact is applied to the writing body. Since this is effectively suppressed, the risk of ink splashing from the pen tip 21 is reduced.

Further, when the writing body 20 is retracted into the barrel 10, the pushing portion 40 is protruded at the rear end of the barrel 10 corresponding to the retraction operation of the pen tip 21 performed in front of the barrel 10. will be This protruding operation is performed at a slow speed due to the presence of the biasing means 31, and along with this, the crown 34 disposed behind the barrel 10 also rotates slowly. For these reasons, the operations of both members can be easily recognized visually, and the user can easily perceive the functional characteristics. Further, the outer peripheral surface of the crown 34 protruding from the barrel 10 may be knurled or diamond cut. In this case, when the crown 34 moves (rotates), the crown 34 reflects light in various directions, thereby obtaining a decorative effect, and the processing also functions as a slip prevention for the crown 34. Therefore, the rotation operation becomes easier.

In addition, the braking portion 60 includes a contact member 62 that contacts the rotating body 30 and a biasing means 61 that biases the contact member 62 against the shaft cylinder 10 in the axial direction da and presses it against the rotating body 30 . have. As a result, the contact member 62 is pressed against the rotating body 30 with a constant pressing force, so that a constant frictional force can be stably applied to the rotating body 30 .

Furthermore, in the writing instrument 100, the biasing means 61 is arranged in front of the rotating body 30, and the contact member 62 is pressed against the rotating body 30 from the front. It is easy to secure a space for 60, and the degree of freedom in designing the braking portion 60 is high. That is, it is easy to set the material of the contact member 62 and the spring constant of the biasing means 61 that determine the frictional force acting on the rotating body 30 as desired.

Note that the biasing means 61 is not limited to a coil spring. For example, a member that provides a desired elastic force such as an O-ring made of rubber or elastomer may be employed as the biasing means and placed in the gap between the barrel 10 and the rotating body 30 .

In the above description, an example in which the pressing portion 40 protrudes rearward from the rear end of the barrel 10 is shown. (shown in the figure) function as a pressing portion, that is, a so-called clip slide type configuration may be used. Alternatively, the writing instrument may be configured as a so-called side-knock type in which an operation portion that can be pressed in the radial direction of the barrel 10 is provided on the side surface of the barrel 10 . In this case, an appropriate mechanism is adopted for converting the pushing force of the operating portion in the radial direction of the barrel 10 into a force in the axial direction da of the barrel 10 .

10 barrel 10a opening 10b rear end 11 middle barrel 11a shoulder 12 long hole 13 barrel main body 14 barrel side locking portion 15 rearward stepped portion 20 writing body 21 pen tip 22 writing body side locking portion 30 rotating body 30a Shoulder portion 30b Rear end surfaces 30c1, 30c2 Groove 30d Stepped portions 30e, 30f Storage recess 31 Front wall portion 31e Swelling portion 32 Rear wall portion 32e Detent portion 33 Main body of rotor 33f Front end of main body of rotor 33r Rear end of main body of rotor 33s Slit 33sf Slit front end 33sr Slit rear end 34 Crown 34a Projection 34b Forward stepped portion 35 Rear end portion 40 Pressing portion 41 Moving portion 50 Coil spring 60 Braking portion 61 Biasing means (coil spring)
62 contact member 100 writing instrument SE1, SE2, SE3, SE4 tangential lines SU1, SU2 gap

Claims (1)

an axle tube;
A writing body supported by the barrel so as to be movable relative to the barrel in its axial direction, and rebounded backward by an elastic body arranged in the barrel, and having a pen tip appearing and disappearing from the front end of the barrel. and,
a middle cylinder provided with an elongated hole extending along the axial direction and an inward stepped portion formed behind the elongated hole, and arranged inside the axial cylinder;
a rotary body provided with a slit extending spirally around the axis, disposed in the shaft cylinder so as to be rotatable relative to the shaft cylinder about the axis, and housed inside the middle cylinder;
a pressing portion having a moving portion that moves in the elongated hole and the slit, the pressing portion being capable of relative movement in the axial direction with respect to the shaft cylinder, but restricted in relative rotation about the axis;
urging means for urging the rotating body in the axial direction with respect to the shaft cylinder to press the shoulder of the rotating body against the shoulder of the middle cylinder;
a crown attached to the rear end of the rotating body extending outward from the rear end of the middle cylinder;
The pressing portion can press against the barrel from the outside of the barrel,
a front end surface of the shoulder portion of the middle cylinder and a rear end surface of the shoulder portion of the rotating body are connected via high-viscosity grease,
A gap is formed between the head crown and the barrel, and when the pressing portion is advanced, the gap is reduced, and the front end surface of the shoulder portion of the middle barrel and the shoulder portion of the rotating body are separated. A writing instrument having a gap between the rear end surface and the

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