JP7273633B2 - 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 utensil realizes retraction operation by an internal rotation mechanism, and can be operated with a quiet operation sound, so that the operation feeling is excellent. On the other hand, in a rotary operation type writing instrument, generally, the barrel is gripped with one hand, the crown of the head is gripped with the other hand, and the pen is rotated about the axis relative to the barrel to move the pen in and out. For this reason, it is difficult to perform a quick appearing and disappearing operation, and the appearing and disappearing operation takes some time, so there is room for improvement in operability.

On the other hand, for example, by pushing a knock member protruding outside from the opening at the rear end of the barrel forward into the barrel, the writing body supported in the barrel is moved from the opening at the front end of the barrel. Retractable, retractable writing implements are 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.

In addition, many of the above-described writing instruments with a knock-type or rotary extension structure form a extension structure by combining precision parts inside the barrel. For example, a writing instrument placed on a desk rolls If it falls on the floor or the like, depending on the material of the floor, the barrel may be distorted, deformed, or damaged, which may affect the delivery structure.

On the other hand, many common writing instruments have a clip as a function of pinching and fixing them in a pocket of clothes, a notebook or a pencil case. It is configured so as to prevent the writing instrument from being damaged or scratched due to the dropping of the writing instrument. In addition, even if the clip is not provided, as in Patent Document 2, a protrusion is provided on the outer surface of the barrel to prevent rolling, and as in Patent Document 3, the end of the writing instrument has a structure that prevents it from rolling. A structure is disclosed in which rolling is prevented by providing two or three corners.

However, in Patent Document 2, Patent Document 3, or a structure that prevents the rotation of the writing instrument by providing a clip on the outer surface of the barrel, for example, when the writing instrument is placed on the desk, a protrusion for preventing it from rolling If a corner or a clip is placed outside the edge of the desk, there is a risk that it will fall from the desk without being able to prevent it from rolling, resulting in deformation or damage to the tip of the pen or barrel. .

JP 2007-320209 A JP 2008-055833 A Japanese Utility Model Laid-Open No. 54-145252

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 operability, and that can prevent rolling when placed on a flat board such as a desk or table.

The present invention is "1. A barrel, a writing body housed in the barrel so as to be relatively movable in the axial direction with respect to the barrel, and a pressing body projecting rearward from the rear end of the barrel. and, by pressing the pressing body forward, at least part of the writing body stored in the barrel protrudes from the front end opening of the barrel,
A protrusion projecting outward is formed on the outer surface of one end of the shaft cylinder,
A rotary operation body is disposed at the other end of the shaft cylinder and rotates about its axis relative to the shaft cylinder by pressing the pressing body forward,
a protrusion projecting outward is formed on the outer surface of the rotary operation body,
A rotating body having a slit extending spirally around the axis while interlocking with the rotating operation body and rotating relative to the shaft cylinder in conjunction with the rotating operation body,
The pressing body has a moving portion that moves within the slit, and is capable of moving relative to the shaft cylinder in the axial direction, but is restricted from rotating relative to the axis,
In a state in which at least part of the writing body protrudes from a tip opening of the barrel, the writing body is accommodated in the barrel by rotating the protrusion, and
A writing utensil characterized in that, in a state in which the writing body is housed in the shaft cylinder, the position of the protruding portion around the axis line is disposed in an opposite region with respect to the protruding portion across the axis.
2. 2. The writing instrument according to item 1, wherein the slit is formed with an engaging portion for engaging the moving portion.
3. 3. The writing instrument according to item 1 or 2 , wherein a coil spring is stretched between the writing body and the barrel so that the pressing body is elastically pushed backward through the writing body. .
4. In a state in which at least part of the writing body protrudes from the front end opening of the barrel, the position at which the protrusion is arranged relative to the protrusion is within 120° in the direction around the axis. 3. The writing instrument according to any one of items 1 to 3 , characterized in that it is configured to
writing instruments.
5. When the writing instrument is placed on a plane board with at least a part of the writing body protruding from the front end opening of the barrel and the outer peripheral surface of the barrel is in contact with the plane board, the protrusion and the In a state in which at least two portions of the projecting portion, the shaft cylinder, and the rotary operation body are in contact with the flat plate, the tip of the writing body does not come into contact with the flat plate. 5. The writing instrument according to any one of items 1 to 4 , wherein the height of outward protrusion of the protrusion is adjusted. ”.
In the present invention, the term "opposite regions across the axis" refers to a state separated by 90° or more in the direction around the axis. Further, in the present invention, in the longitudinal direction (axial direction) of the barrel, the side of the front end opening where the writing body appears is referred to as the front side, and the opposite direction is referred to as the rear side. Furthermore, in the axial radial direction of the barrel, the direction away from the axis is expressed as outward, and the direction approaching the axis is expressed as inward.

According to the first aspect of the present invention, by knocking the pressing body forward, at least a part of the writing body can be easily protruded from the front end opening of the barrel, and the projection of the rotating body By operating , the writing body can be easily accommodated in the shaft cylinder, so that the operability in the retracting operation of the writing body is very excellent.
In the present invention, since the rotating body is configured to rotate relative to the barrel by pressing the pressing body, by converting the movement in the direction along the axis into a rotating force, You can slow down your movements. For this reason, when the writing body is housed in the barrel, the rotation of the rotating body is braked, so that the pressing body moves back more slowly, and the shock applied to the writing body is alleviated, resulting in a comfortable operation. improves.

Further, in a state where the writing body is housed in the shaft cylinder, the position of the projection in the direction around the axis of the projection is arranged in the opposite region across the axis. When the writing instrument is placed on a desk or table, the two protrusions restrict the range in which the writing instrument rolls around the axis in both forward and reverse directions, so the writing instrument does not fall from the desk or table. can be prevented. When the writing instrument is placed on a flat board such as a desk or a table so that the outer surface of the barrel contacts the writing instrument while the writing body is housed in the barrel, the protrusions and protrusions do not touch the board. The smaller the range in which the writing instrument rolls on the board, the smaller the range in which the writing instrument rolls on the board, the less the risk of it falling and the higher the safety. It is preferable that the positions of the protruding parts in the direction around the axis relative to the positions of are separated from each other by 90° or more, more preferably by 120° or more, so that they are located in opposite regions across the axis. A separation of 150° or more is more preferred, and a separation of 180° is most preferred.
Furthermore, in the present invention, since two protrusions, a protrusion and a protrusion, are formed, when the writing instrument is placed on a desk or table, even if one protrusion protrudes from the edge of the desk or table, the other protrusion does not. can prevent the writing instrument from rolling, reducing the risk of the writing instrument falling from the desk or table to the floor.

Next, according to the second aspect of the present invention, since the relative rotation about the axis of the moving part that moves in the spirally extending slit of the rotating body when the pressing body is pressed is regulated, the moving part Along with the movement of the rotator, the rotator rotates, and the rotary operation body interlocking with the rotator can be rotated. The rotary operating body and the rotary body may be separately formed and then engaged so as to rotate in conjunction with each other, or may be integrally formed so as to interlock with each other. Forming them separately makes it possible to adjust the position of the projection formed on the rotary operation body in the direction around the axis relative to the rotary body, which is preferable.

Next, according to the third aspect of the present invention, the slit may be formed with a locking portion for locking the moving portion. By constructing the moving part to engage with the engaging part in a protruded state, it is possible to maintain the state in which the writing body protrudes from the front end opening of the barrel.

Next, according to the fourth aspect of the present invention, by stretching a coil spring between the writing body and the barrel, the pressing body may be elastically pushed backward through the writing body. In this case, in a state in which at least part of the writing body protrudes from the front end opening of the barrel, the protruding portion of the rotating body is rotated by hand to engage the moving portion and the engaging portion of the slit. By releasing and moving the moving part to the spiral groove part, the pressing body can be retracted by the elastic force of the coil spring, and the writing body can be automatically retracted accordingly. At this time, if the elastic force of the coil spring is set high, the retraction speed of the writing body will be faster, and when the writing body is finally retracted, a large impact will be applied to the writing body. It is preferable to adjust the elastic force of the coil spring.

Next, according to the fifth aspect of the present invention, in a state in which at least a part of the writing body protrudes from the front end opening of the barrel, the position at which the protrusion is arranged with respect to the protrusion is , may be positioned within a range of 120° in the direction around the axis. By positioning the writing instrument at the position, the rolling range of the writing instrument is reduced and the risk of falling is reduced. It is suitable because the tip of the cursive writing is effectively protected. Furthermore, when the writing instrument is placed on a flat plate such as a desk or table, the height at which the protrusion and the protrusion protrude outward is adjusted so that both the protrusion and the protrusion contact the flat plate at the same time. By adjusting and arranging both projections in a well-balanced manner at both ends of the writing instrument in the axial direction, the projections and projections may be used as legs to stand on. This is more preferable because it can be lowered further.

Next, according to the sixth aspect of the present invention, a writing instrument is placed on a flat board such as a desk or a table, with at least part of the writing body protruding from the front end opening of the barrel. When placed so that the surface is in contact with the plane board, in a state in which at least two of the projecting part, the projecting part, the barrel, and the rotary operation body are in contact with the plane board, the tip of the writing body is in contact with the plane board. The protruding portion and the protruding height of the protruding portion may be adjusted so as not to come into contact with the flat plate. Even if some kind of external force acts on the tip and the writing instrument rolls because it cannot be supported by the two protrusions, the tip of the writing body does not contact the flat plate of the desk or table, so the tip can be prevented from being deformed or damaged. .

According to the present invention, it is possible to provide a writing instrument that achieves both operability and operability, and that can prevent rolling when placed on a flat board such as a desk or table.

1 is a schematic side view showing a writing instrument according to an embodiment of the present invention, with the nib immersed; FIG. 2 is a schematic longitudinal sectional view showing the mechanical pencil of FIG. 1; FIG. FIG. 3 is a rear enlarged view of FIG. 2; 1 is a schematic side view showing a writing instrument according to an embodiment of the present invention, in which the nib protrudes; FIG. 2 is a schematic longitudinal sectional view showing the mechanical pencil of FIG. 1; FIG. FIG. 6 is a rear enlarged view of FIG. 5; FIG. 3 is a schematic front view showing a middle cylinder of the writing instrument of FIG. 2; 8A is a front view of the rotating body in the state of FIG. 2, and FIG. 8B is a front view of the rotating body in the state of FIG. 5. FIG. . 2, FIG. 9A is a longitudinal sectional view along line 8A-8A of FIG. 8A, and FIG. 9B is a longitudinal sectional view along line 8B-8B of FIG. 8B. FIG. 10 is a schematic exploded view of the body of revolution cut open along line C in FIG. 9; FIG. 11A is an enlarged view showing the vicinity of the front end of the rotor shown in FIG. 8, FIG. 11A is an enlarged view showing the vicinity of the front end of the front wall of the rotor, and FIG. 11A is an enlarged view showing the vicinity of the front end of the rear wall of the rotor; It is a diagram. 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. 13 is a rear view of the writing instrument in FIG. 12, FIG. 13A is a rear view of the writing instrument in the state of FIG. 12A, and FIG. 13B is a rear view of the writing instrument in the state of FIG. 12B. 13C is a rear view of the writing instrument in the state of FIG. 12C, and FIG. 13D is a rear view of the writing instrument in the state of FIG. 12D. 5 is an explanatory diagram showing a state in which the writing instrument of FIG. 4 is held by hand; FIG. FIG. 5 is an explanatory diagram of a state in which the writing instrument of FIG. 4 is placed on a flat board such as a desk with projections and projections in contact with each other at the same time, as seen from the rear side; FIG. 16A is an explanatory view of the state in which the writing instrument of FIG. 4 is placed on a flat board, viewed from the side, FIG. FIG. 11 is an explanatory diagram for explaining a state in which the rotary operation body and the rotating operation body are in contact with each other at the same time;

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

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

As shown in FIGS. 1, 2, 8 and 9, the writing instrument 100 includes a barrel 10, a writing body 20 supported by the barrel 10, and an axis L of the barrel 10 arranged in the barrel 10. a rotating body 30 provided with a slit 33s spirally extending around the circumference of the rotating body 30; a pressing body 40 having a moving portion 41 that moves within the slit 33s; It has a rotation operating body 50 that is fixed in an unmovable manner, and a protruding portion 60 that is fixed to the front outer surface of the barrel 10 . 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 opening 10a. As shown in FIG. 1, the projecting portion 60 is formed on the front outer surface of the barrel 10 so as to extend rearward along the assumed axial direction da. It has a function as a so-called clip that holds a thin flat object between them.

As shown in FIGS. 1 and 2, a cylindrical barrel 10 includes a front shaft 11, a center shaft 12 screwed to the rear portion of the front shaft 11, a rear shaft 13 connected to the rear portion of the center shaft 12, and It has a middle cylinder 14 arranged inside the rear axle 13 and a tip 15 connected to the front part of the front axle 11 . As shown in FIG. 2, the middle cylinder 14 is formed with a long hole 14a extending along the axial direction da. FIG. 6 shows a front view of the middle cylinder 14 seen from the left in FIG. As shown in FIG. 1, the long hole 14a has a width that can accommodate the moving portion 41 of the pressing body 40, and is provided symmetrically with respect to the axis L. As shown in FIG. The front end opening 10a described above is formed at the front end of the tip 15. As shown in FIG.

As shown in FIGS. 8 to 10, 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 around the axis L (see FIG. 2) with a phase difference of 180° from each other. As shown in FIGS. 8 and 9, each slit 33s extends forward (downward in FIGS. 8 and 9) from the vicinity of the rear end 33r of the rotor main body 33 at 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 . 11A 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. As shown in FIG. 11A, the front wall portion 31 has a bulging portion 31e that bulges rearward (upward in FIG. 11A) in the vicinity of the front end 33f of the slit 33s. As shown in FIG. 11A, in the front wall portion 31, the tangential line when viewed from the right side in FIG. 11A always forms an acute angle (0°<θ1< θ2<90°).

11B is an enlarged view showing the vicinity of the front end of the rear wall portion 32 of the rotating body 30 shown in FIG. 8. FIG. As shown in FIG. 11B, the rear wall portion 32 of each slit 33s is formed with a detent portion 32e protruding forward near the front end thereof to serve as a locking portion. In the rear wall portion 32, before and after the detent portion 32e, an obtuse angle θ3 is formed between a tangent line of the rear wall portion 32 when viewed from the right in FIG. 11B and a vector directed rearward along the axial direction da. to an acute angle θ4.

Returning to FIG. 2 , the rear end of the writing body 20 abuts against the pressing body 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 70 . As shown in the figure, the coil spring 70 includes a barrel-side locking portion 11a provided on the inner surface of the front barrel 11 and a writing-body-side locking portion 11a provided on the writing body 20 behind the barrel-side locking portion 11a. It is arranged in a compressed state between the stop portion 22 and the.

As shown in FIGS. 1 and 2, the pressing body 40 extends rearward from the rear end of the barrel 10 and can be pushed forward from the outside of the barrel 10 . The pressing body 40 is disposed in the middle cylinder 14 so as to pass through the rotating body 30 in the axial direction da, and is movable relative to the shaft cylinder 10 in the axial direction da. The moving part 41 of the pressing body 40 penetrates both of the two slits 33 s of the rotating body 30 in the radial direction, and both ends are positioned in the long holes 14 a of the middle tube 14 . A rear end portion 35 of the rotating body 30 extends outside from the rear end of the middle cylinder 14 , and a rotary operation body 50 is attached to the rear end portion 35 . The rotary operation body 50 is restricted from moving forward relative to the barrel 10 by coming into contact with the rear end of the rear shaft 13 . As a result, even when the rotating body 30 is pressed forward by the pressing body 40 , the forward relative movement of the rotating body 30 with respect to the barrel 10 is restricted. A protrusion 51 protruding outward is formed on the outer surface of the rotary operation body 50, and the writing instrument 100 of the present embodiment is oriented sideways so that the barrel 10 is in contact with a flat plate (for example, a desk). The projection height is defined so that the projection 51 projects outward from the maximum diameter portion of the barrel 10 so as to prevent the writing instrument 100 from rolling when the writing instrument 100 is placed. .

As shown in FIG. 3, a rotor biasing coil spring 80 is stretched between the front end of the rotor 30 and the rear end of the center shaft 12. The rotating body 30 is urged rearward via a spring receiving ring 81 disposed therebetween. As a result, the rear outer stepped portion 34 formed on the outer peripheral surface of the rear portion of the rotating body 30 is always pressed against the inner stepped portion 14b of the middle cylinder 14 by the elastic force of the coil spring 80 for urging the rotating body. There is. Furthermore, although not shown, grease is applied between the rear outer step portion 34 and the inner step portion 14b to prevent the rear outer step portion 34 and the inner step portion 14b from being damaged. In addition, when the rotating body 30 rotates with respect to the middle cylinder 14, it rotates smoothly and generates constant resistance to rotation. Further, although not shown, grease is also applied between the moving portion 41 of the pressing body 40 and the slit 33s of the rotating body 30, so that the moving portion 41 moves through the slit 33s.

Next, the action of extending the writing body 20 of the writing instrument 100 as described above will be described with reference to FIGS. 10, 12A to 12D and 13A to 13D.

12A to 12D are diagrams for explaining the operation of drawing out the writing body 20 of the writing instrument 100 of FIG. , the rotating operation body 50 and the projecting portion 60 are extracted, the rotating body 30 is developed, and the position of the long hole 14a of the middle cylinder 14 is superimposed. 12A shows a state in which the writing body 20 is retracted into the barrel 10, FIG. 12B shows a state in which the writing body 20 is moving forward relative to the barrel 10, and FIG. 12C shows the writing body 20. project from the barrel 10, and FIG. 12D shows a state in which the writing body 20 moves rearward relative to the barrel 10. FIG.
13A to 13D are diagrams for explaining the drawing action of the writing body 20 of the writing instrument 100 in FIG. 1, and each diagram in FIG. 13 corresponds to FIGS. 12A to 12D. . 13 is a view of FIG. 12 viewed from the rear end side of the pressing pair 40, and shows the positional relationship around the axis L between the projecting portion 60 and the projecting portion 51. As shown in FIG. 13A is a diagram corresponding to FIG. 12A, FIG. 13B is a diagram corresponding to FIG. 12B, FIG. 13C is a diagram corresponding to FIG. 12C, and FIG. 13D is a diagram corresponding to FIG. 12D. .

Here, as shown in FIGS. 10 and 12A, 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 body 40 is located at the rear end of each of the slit 33 s of the rotating body 30 and the long hole 14 a of the middle cylinder 14 . This state is maintained by the coil spring 70 urging the writing body 20 backward against the barrel 10 . At this time, as shown in FIG. 13A, the projection 51 of the rotary operation body 50 and the projection 60 formed as a clip are in opposite regions with respect to the axis L (axis center). , and the protrusion 51 is located at a position rotated by 180° in the direction around the axis L with respect to the protrusion 60 .

In the writing instrument 100, when the pressing body 40 is pressed forward against the barrel 10 with a force F (see FIG. 12B) from the state shown in FIG. 12A, the moving part 41 presses the front wall part 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 perpendicular to the axial direction da. By the way, both ends of the moving part 41 are positioned in the long holes 14 a of the middle cylinder 14 , so that they are restricted from rotating about the axis L relative to the middle cylinder 14 . Therefore, as shown in FIG. 12B, the moving portion 41 moves forward relative to the shaft tube 10 along the elongated hole 14a without relatively rotating. As a result, the rotating body 30 is rotated clockwise 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 70 . As the rotating body 30 rotates relative to the barrel 10, the rotary operation body 50 also rotates about the axis L relative to the barrel 10 (see FIG. 12B). The protrusion 51 of the rotary operation body 50 also rotates at the same time, and the protrusion 60 and the protrusion 51 are positioned at the same position around the axis L when viewed from the rear of the barrel 10 . That is, as shown in FIG. 13B, the rotary operation body 50 rotates counterclockwise by 180° by advancing the pressing body to the state shown in FIG. 12B.

At this time, the force required to move the pressing body 40 forward relative to the barrel 10 is the reaction force received by the moving part 41 from the front wall part 31 of the rotating body 30 and the biasing force of the coil spring 70. It is a resultant force. Since the inclination of the front wall portion 31 of the rotating body 30 is constant until the moving portion 41 of the pressing body 40 reaches the bulging portion 31e 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 body 40 . Since the rotating body 30 is urged against the middle cylinder 14 by the rotating body biasing coil spring 80 , the rotating body 30 also generates rotational resistance and moves from the front wall portion 31 of the rotating body 30 . It is configured to increase the reaction force that the portion 41 receives. On the other hand, the biasing force of the coil spring 70 increases at a constant rate as the pressing body 40 moves forward relative to the barrel 10 . As described above, the force required to move the pressing body 40 forward relative to the barrel 10 increases at a constant rate.

Then, when the moving portion 41 of the pressing body 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. 11). . Therefore, of the force acting on the front wall portion 31 of the rotating body 30 from the moving portion 41, the ratio of the force acting to relatively rotate the rotating body 30 about the axis L with respect to the shaft tube 10 is reduced. do. 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 body 40 . That is, when the moving portion 41 of the pressing body 40 reaches the bulging portion 31e of the rotating body 30, the user pressing the pressing body 40 is provided with a heavy operational feeling.

Then, when the moving portion 41 of the pressing body 40 gets over the apex 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. 11A). 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 body 40 . That is, when the moving portion 41 of the pressing body 40 climbs over the apex of the bulging portion 31e of the rotating body 30, the user pressing the pressing body 40 is provided with a light operational feeling. As described above, just before the moving portion 41 of the pressing body 40 is positioned at the front end 33sf of the slit 33s, the user is provided with a click feeling. Furthermore, in the operation up to this point, the action of the grease applied between the moving portion of the pressing body 40 and the slit 33s of the rotating body 30 provides a quiet and smooth operational feeling.

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 body 40 is released, the writing body 20 is urged rearward with respect to the barrel 10 by the urging force of the coil spring 70 . As a result, the moving portion 41 of the pressing body 40 is moved rearward relative to the barrel 10 and pressed against the rear wall portion 32 of the rotating body 30 (see FIG. 12C). At this time, the detent portion 32e of the rotating body 30 is positioned at a position more clockwise around the axis L than the moving portion 41 when viewed from the rear. As described above, since a part of the detent portion 32e forms an obtuse angle θ3 with the vector directed backward along the axial direction da (see FIG. 11B), the biasing force of the coil spring 70 causes the moving portion 41 to rotate. Even if the rear wall portion 32 of the body 30 is pushed backward, the rotating body 30 is not rotated relative to the shaft tube 10 around the axis L, and the moving portion 41 is a detent portion serving as a locking portion. 32e. At this time, as shown in FIG. 13C, the projection 51 of the rotary operation body 50 rotates further from the state shown in FIG. 90° counterclockwise.

By the above operation, the operation of exposing 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 user pushes the protrusion 51 of the rotary operation body 50 relative to the barrel 10 so that it rotates clockwise when viewed from behind. At this time, the rotary body 30 is rotated about the axis L relative to the barrel 10 together with the rotary operation body 50, and the detent portion 32e of the rotary body 30 pushes the moving portion 41 of the pressing member 40 forward with respect to the barrel 10. do. As a result, while the writing body 20 compresses the coil spring 70, the moving portion 41 climbs over the detent portion 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 the biasing force of the coil spring 70, and the pressing body 40 in contact with the writing body 20 moves toward the shaft. It is moved rearward relative to the cylinder 10 . Therefore, it is not necessary for the user to continue to relatively rotate the rotary operation body 50 clockwise. When the pressing body 40 moves relative to the shaft tube 10, the moving part 41 rotates the rotating body 30 counterclockwise relative to the shaft tube 10 as viewed from the rear, while moving along the elongated hole 14a of the middle tube 14. It moves rearward relative to the barrel 10 (see FIG. 12D). 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. 12A. Also in this rearward relative movement of the pressing body 40 with respect to the barrel 10, the action of the grease can provide a quiet and smooth operation feeling. In addition, when the user operates the rotary operation body 50, by pressing the protrusion 51, it is possible to prevent the user from making a mistake in the rotary operation due to a slip of the hand, and to operate the rotary operation body 50 with a light force. On the other hand, since the rotating body 30 is urged rearward by the rotating body urging coil spring 80 as described above, the rear outer stepped portion 34 of the rotating body 30 is pressed against the inner stepped portion 14b of the middle tube 14 and Since grease is applied between the rear outer step portion 34 and the inner step portion 14b, a constant rotational resistance is generated in the rotation of the rotating body 30. As shown in FIG. For this reason, the speed at which the writing body 20 returns to the barrel 10 is also reduced, and the writing body 20 is returned slowly, preventing the writing body 20 from being impacted by sudden braking when the moving part 41 reaches the slit 33sr. As a result, the possibility of ink scattering from the pen tip 21 is reduced, and the operability is improved.

The pen point 21 of the writing instrument 20 can be protruded from the barrel 10 also by rotating the rotary operation body 50 relative to the barrel 10 around the axis L. In this case, in the initial state shown in FIG. 12A, as viewed from the rear as shown in FIG. The force received from the rear wall portion 32 of the body 30 moves forward within the elongated hole 14 a of the middle cylinder 14 . As a result, the writing body 20 moves forward relative to the barrel 10 while compressing the coil spring 70 , and the nib 21 is gradually exposed from the barrel 10 . Thus, when the writing body 20 is exposed from the front end of the barrel 10 by rotating the rotary operation body 50 , 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 body 40 described above, interaction between the front wall portion 31 of the rotating body 30 and the moving portion 41 does not occur. Further, even in this case, the protrusion 51 of the rotary operation body 50 can prevent slipping, so that the rotary operation can be easily performed.

Immediately before the moving portion 41 of the pressing body 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 presses the rear wall portion 32 of the rotating body 30 rearward due to the biasing force of the coil spring 70, the moving portion 41 moves rearward relative to the barrel 10. There is nothing to lose. That is, the state in which the nib 21 of the writing body 20 is exposed from the barrel 10 is stably maintained. 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. 12C and 12D, so description thereof will be omitted here.

According to the writing instrument 100 as described above, by pressing the pressing body 40 forward against the barrel 10, the rotating body 30 smoothly rotates relative to the barrel 10 around the axis L, and the pen of the writing body 20 is rotated. A tip 21 is exposed from the barrel 10 . That is, according to the present invention, since the writing body 20 can be quietly and smoothly retracted from the barrel 10 by a simple operation, it is possible to provide the writing instrument 100 that achieves both operability and operability.

Further, the rotating body 30 can be rotated from the outside of the barrel 10 via the rotating operation body 50, and when the rotating body 30 is rotated relative to the barrel 10 around the axis L, the moving portion 41 of the pressing body 40 is rotated. is moved relative to the barrel 10 in the axial direction da, and when the pushing body 40 is pushed forward against the barrel 10, the rotating body 30 is rotated about the axis L relative to the barrel 10. As shown in FIG. As a result, the pen tip 21 of the writing body 20 can be moved to the barrel either by pressing the pressing body 40 forward against the barrel 10 or by rotating the rotary body 30 about the axis L via the rotary operation body 50 . 10 can be exposed.

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 operation of pushing the pressing body 40 forward with respect to the barrel 10 and exposing the pen point 21 of the writing body 20 from the barrel 10 is completed, the user is provided with an appropriate click feeling.

Furthermore, since the rotary operation body 50 has the protrusions 51, the operation of the rotary operation body 50 is improved because it becomes non-slip when the rotary operation body 50 is operated.

1, 2, 4, 5, and 13 to 16, the effects of the two projections (the projection 51 and the projection 60) of the writing instrument 100 will be further described.
In the writing instrument 100 shown in FIGS. 1 and 2 in which the nib 21 of the writing body 20 is immersed in the barrel 10, as shown in FIG. It is arranged at a position rotated by 180°. Therefore, when the writing instrument 100 is placed on a flat board such as a desk, either the projection 51 or the projection 60 hits the flat board regardless of whether the writing instrument 100 rotates forward or backward as viewed from the rear. Rotation is inhibited by contact. Therefore, in this state, the range in which the writing instrument 100 rolls is limited, and it is prevented from rolling down when placed on a desk or the like. Even if the writing instrument 100 is placed so that either the front or back side of the outer surface of the writing instrument 100 abuts on the flat plate, the smaller the range in which the writing instrument 100 rolls, the greater the safety. It is preferable that the positions in the L direction around the axis of are separated from each other by 90° or more, more preferably 120° or more, and 150° or more so that they are located in opposite regions across the axis. is more preferred, and 180° apart is most preferred.
In addition, in the present embodiment, since the protrusion 51 and the protrusion 60 are arranged at the front and rear ends in the direction of the axis L, either the protrusion 51 or the protrusion 60 is placed on a desk or the like. Even when the writing instrument 100 is placed in a state of protruding from the end of the desk, the rolling of the writing instrument 100 is restricted by one of the protrusions, so when the writing instrument 100 is placed on the desk or the like, the writing instrument 100 rolls and falls, thereby causing the barrel to fall. It is possible to effectively prevent a decrease in commercial value due to damage or distortion of the 10, or an inability to pay out due to an effect on the pay-out structure.

4 and 5, in a state where the pen point 21 of the writing body 20 of the writing instrument 100 protrudes outside from the front end opening 10a of the barrel 10, the writing instrument 100 is held as shown in FIG. 13C. When viewed from the rear, the projecting portion 51 is locked at a position rotated 90° counterclockwise about the axis L with respect to the projecting portion 60 . In this state, as shown in FIG. 14, when the writing instrument 100 is gripped to write on a sheet of paper or the like, the projecting portion 60 can be gripped between two fingers so as to be gripped firmly, thereby preventing slippage. can be prevented. Further, when the present invention is applied to a fountain pen or the like in which the rotational position at which the pen point 21 of the writing body 20 contacts the paper surface when writing is determined as in the present embodiment, the projecting portion 60 is gripped. As a result, the writing body 20 is naturally arranged at the correct position with respect to the paper surface. Therefore, the writing operability is significantly improved. Furthermore, at this time, as shown in FIG. 14, the protrusion 51 is arranged at a position where it is least likely to come into contact with the gripping hand (the position opposite to the back of the hand of the rotary operation body 50 in FIG. 14). It is possible to prevent the protruding state of the writing body 20 from being erroneously released by touching a part of the hand, and when the protrusion 51 is pressed to rotate the rotary operation body 50 at the end of writing, Since the portion 51 is easy to see and the protruding portion 51 is located at a position that is easy to operate, the pen tip 21 can be easily retracted.

Furthermore, in the present embodiment, when it becomes necessary to place the writing instrument 100 on a flat board such as a desk while the pen tip 21 of the writing body 20 is protruding from the barrel 10 as shown in FIGS. As shown in FIG. 15, when the writing instrument 100 is viewed from the rear side, the projections 51 and the projections 60 are placed in contact with the plane board at the same time, so that the writing instrument 100 moves forward and backward about the axis L. It is possible to put it so that it does not rotate at all. For this reason, the writing instrument 100 is further prevented from falling off the desk in a state in which the tip of the writing body, which is often formed of precision-machined parts, pointed ends, and soft materials, protrudes from the front end opening 10a of the barrel. became possible. When the projections 51 and 60 are placed in contact with the flat board, the projection 51 rotates clockwise around the axis L with respect to the projection 60 when the writing instrument 100 is viewed from behind. A force pushing in the direction is generated, but in a state where the pen tip 21 of the writing body 20 protrudes from the front end opening 10a, as described above, when the protruding portion 51 is rotated counterclockwise, the pen tip 21 protrudes. Since the state is configured to be released, a force is applied in the direction opposite to the release. Therefore, when the writing instrument 100 is placed on a desk or the like, the protruding state of the writing body 20 is not released carelessly. In addition, when the pen tip 21 of the writing body 20 protrudes from the barrel 10, the angle of the protrusion 51 in the direction around the axis L of the protrusion 51 is such that the protrusion 51 and the protrusion 60 are positioned at the same time as the desk or the desk. It is preferably configured to be less than 120° so that it can abut against the table.

Furthermore, in the state shown in FIG. 4 in which the pen point 21 of the writing body 20 protrudes from the barrel 10, when the writing instrument 100 is placed on a flat plate such as a desk, the protrusions 51, 60 and barrel 10 It is preferable that the tip of the pen point 21 of the writing body 20 does not come into contact with the plane board when at least two points of the rotating operation body 50 are in contact with the plane board, and not all cases are shown. For example, in the state shown in FIG. 16A in which only the shaft tube 10 and the protrusion 51 abut against the flat plate, and in the state shown in FIG. The heights of protrusions 51 and 60 projecting outward are adjusted so that the pen point 21 of the writing instrument 20 does not touch the flat board even in the state of . Even if the pen point 21 of the writing body 20 is forcibly rolled on the flat board by hand, it is possible to prevent the tip of the pen point 21 from coming into contact with the flat board. Therefore, the risk of damage or deformation of the pen tip 21 of the writing body 20 can be reduced.

In the present embodiment, the writing instrument 100 is exemplified as a right-handed fountain pen, but in the case of a left-handed fountain pen, although not shown, the slit 33s of the rotating body 30 is tilted with respect to the direction of the axis L. The direction in which the rotor rotates can be reversed by tilting it in the opposite direction, as if it were flipped by a mirror, and it is possible to convert it for left-handed use.
Further, in the present embodiment, the projecting portion 51 functioning as a clip is engaged with the outer surface of the barrel 10, but the projecting portion 51 of the rotary operation body 50 may be configured to function as a clip. .

10 barrel 10a front end opening 11 front barrel 11a barrel side locking portion 12 middle barrel 13 rear barrel 14 middle barrel 14a long hole 14b inner stepped portion 15 tip 20 writing body 21 pen tip 22 writing body side locking portion 30 rotating body 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 Front end of slit 33sr Rear end of slit 34 Rear external step portion 35 Rear end portion 40 Pressing body 41 Moving part 50 Rotating operation body 51 Protruding part 60 Protrusive part 70 Coil spring 80 Coil spring 81 for biasing rotating body Spring receiving ring 100 Writing instrument.

Claims (5)

a barrel, a writing body housed in the barrel so as to be relatively movable in its axial direction with respect to the barrel, and a pressing body projecting rearward from a rear end of the barrel, A writing instrument configured such that at least part of the writing body stored in the barrel protrudes from a front end opening of the barrel by pushing a pressing body forward,
A protrusion projecting outward is formed on the outer surface of one end of the shaft cylinder,
A rotary operation body is disposed at the other end of the shaft cylinder and rotates about its axis relative to the shaft cylinder by pressing the pressing body forward,
a protrusion projecting outward is formed on the outer surface of the rotary operation body,
A rotating body having a slit extending spirally around the axis while interlocking with the rotating operation body and rotating relative to the shaft cylinder in conjunction with the rotating operation body,
The pressing body has a moving portion that moves within the slit, and is capable of moving relative to the shaft cylinder in the axial direction, but is restricted from rotating relative to the axis,
In a state in which at least part of the writing body protrudes from a tip opening of the barrel, the writing body is accommodated in the barrel by rotating the protrusion, and
A writing utensil characterized in that, in a state in which the writing body is housed in the shaft cylinder, the position of the protruding portion around the axis line is disposed in an opposite region with respect to the protruding portion across the axis. 2. The writing instrument according to claim 1, wherein the slit is formed with a locking portion for locking the moving portion. 3. The writing instrument according to claim 1 , wherein a coil spring is stretched between said writing body and said barrel so that said pressing body is elastically pushed backward through said writing body. In a state in which at least part of the writing body protrudes from the front end opening of the barrel, the position at which the projection is arranged with respect to the projection is within 120° in the direction around the axis. 4. The writing instrument according to any one of claims 1 to 3 , wherein the writing instrument is configured to When the writing instrument is placed on a plane board with at least a part of the writing body protruding from the front end opening of the barrel and the outer peripheral surface of the barrel is in contact with the plane board, the protrusion and the In a state in which at least two portions of the projecting portion, the shaft cylinder, and the rotary operation body are in contact with the flat plate, the tip of the writing body does not come into contact with the flat plate. 5. The writing instrument according to any one of claims 1 to 4 , wherein the height of outward projection of the projection is adjusted.

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