JP4830353B2 - Writing instrument - Google Patents

Description

  The present invention relates to a writing instrument in which a writing body is arranged to be movable back and forth with respect to a shaft cylinder.

One example is a mechanical pencil that uses a gear mechanism to feed out the lead. Details will be described below. A rack is formed in the axial direction on the side surface of the chuck for holding the pencil lead. The chuck is slidably accommodated in the shaft cylinder. In addition, a spring that presses the chuck toward the tail end is stretched between the collar of the chuck and the step on the inner surface of the shaft tube, and the axial movement range is limited by the step on the inner surface of the shaft tube. The tightened ring is fitted to the chuck. In addition, a fan-shaped gear meshing with the rack is rotatably disposed on the shaft cylinder, and the fan-shaped gear is mounted on an inner surface of a cover attached to a side surface of the shaft cylinder so as to be movable in a direction perpendicular to the shaft. The tip of the arm protruding from the gear is provided opposite to it. That is, by pressing the cover, the gear is rotated, and by rotating the gear, the chuck is moved together with the rack in the axial direction to feed out the pencil lead.
Japanese Utility Model Publication No. 48-11003

However, in the above-described prior art, alignment of the sector gear and the rack is required at the time of assembly, and time is spent for the assembly, resulting in poor productivity. In other words, in consideration of both the state where the pencil lead is not extended when not in use and the state where the pencil lead is extended when used, i.e., the position of both, the sector gear and the rack must be aligned and assembled. I had to.
In addition, since the cover and the arm of the sector gear are in contact with each other, the sector gear and the rack must be aligned and assembled while taking into consideration the pressing operation amount of the sector gear by the cover, further reducing the productivity. It was.

The present invention includes a chuck body which performs gripping and opening of the core, a writing instrument disposed rotatably in forward and backward feeding mechanism of the core relative to the barrel with a slide member fixed to the chuck body in front, the slide An engagement receiving portion is provided on the member , an engagement portion that engages / disengages with the engagement receiving portion is provided on the operating body, the slide member is urged rearward by a resilient member, and the shaft Forming an opening on the front side surface of the cylinder, forming an annular protrusion on an outer surface of the shaft cylinder at an edge of the opening, and fitting the operating body into the circumferential protrusion; The operation body is disposed so as to be rotatable with respect to the shaft cylinder, and the engagement receiving portion and the engagement portion are engaged / disengaged by rotation of the operation body, and the engagement receiving portion and the The sliding member moves forward against the elastic force of the elastic member by engaging with the engaging portion, and the engaging receiving portion The slide member by non-engagement with the engaging portion is summarized in that the retraction by the elastic force of the elastic member.

The present invention includes a chuck body which performs gripping and opening of the core, a writing instrument disposed rotatably in forward and backward feeding mechanism of the core relative to the barrel with a slide member fixed to the chuck body in front, the slide An engagement receiving portion is provided on the member , an engagement portion that engages / disengages with the engagement receiving portion is provided on the operating body, the slide member is urged rearward by a resilient member, and the shaft Forming an opening on the front side surface of the cylinder, forming an annular protrusion on an outer surface of the shaft cylinder at an edge of the opening, and fitting the operating body into the circumferential protrusion; The operation body is disposed so as to be rotatable with respect to the shaft cylinder, and the engagement receiving portion and the engagement portion are engaged / disengaged by rotation of the operation body, and the engagement receiving portion and the The sliding member moves forward against the elastic force of the elastic member by engaging with the engaging portion, and the engaging receiving portion Since the slide member by non-engagement with the engagement portion is retracted by the elastic force of the elastic member, it is possible to perform alignment of the operating tool and the longitudinal motion means very easily, as a result, the productivity An excellent writing instrument can be provided.

  A first example will be described with reference to FIGS. The rear portion of the shaft cylinder 1 made of a transparent resin material is a core tank portion 2 that accommodates a plurality of cores. An eraser 3 and a cap member 4 are detachably attached to the rear portion of the shaft cylinder 1 so as to cover the eraser 3. The cap member 4 is integrally formed with the clip portion 5, but may be formed of a separate member and fixed by a known means. Moreover, the cross-sectional shape of the inner surface and the outer surface of the shaft tube 1 is an octagonal shape so that the lens effect can be exhibited. In other words, by obtaining the lens effect, it is interesting and the core accommodated in the core tank unit 2 is enlarged so that the remaining amount of the core can be easily checked.

On the other hand, a slide member 6 is disposed inside the front portion of the shaft cylinder 1 so as to be movable back and forth. The slide member 6 is formed with a core passage hole 7 that can accommodate a plurality of cores. By allowing the slide member 6 to accommodate a plurality of cores, for example, a long eraser that can be fed out can be attached to the core tank portion 2. It should be noted that a core receiving part for separating the cores from the core tank part 2 one by one may be integrally formed at the rear part of the slide member 6, but the core receiving part is constituted by a separate member and means such as press-fitting into the slide member. It may be fixed by.
A chuck body 8 that holds and releases the core is fixed to the front end of the slide member 6, and a chuck ring 9 that opens and closes the chuck body 8 surrounds the front of the chuck body 8. ing. Reference numeral 10 is a resilient member made of a coil spring or the like that urges the slide member 6 or the chuck body 8 toward the rear.
A lead detent member 11 made of silicone rubber, nitrile butadiene rubber, or the like that restricts the retraction of the lead core is located in front of the chuck body 8. Although it is fixed in a state where it is press-fitted into the inner surface of the tip member 12 screwed to the front end of the tip member 12, it may be integrally formed on the inner surface of the tip member 12 as an elastic piece. A core protection tube 13 made of a metal material or the like is press-fitted and fixed to the front end of the tip member 12, but the core protection tube 13 may be formed integrally with the tip member 12. Reference numeral 14 is a grip member having a non-slip property made of a rubber material or the like attached to a gripping portion of the shaft tube 1, but the anti-slip property is formed by forming fine irregularities on the surface of the shaft tube 1. You may integrally form as a grip part which has.

A flat portion 15 is formed on a portion of the outer surface of the slide member 6. A cylindrical projection (engagement receiving portion) 16 is formed in front of the flat portion 15. On the other hand, an opening 17 is formed on the side surface of the shaft tube 1, and a circumferential protrusion 18 is formed on the edge of the opening 17. In addition, a disk-shaped rotary operation body 19 is rotatably fitted in the circumferential protrusion 18, but is not limited to a disk shape, and is a square shape, a triangular shape, or a star shape. May be. Specifically, a circumferential groove 20 formed on the inner surface of the rotary operation body 19 is fitted in the circumferential protrusion 18, and two positions formed on the outer periphery of the upper end of the circumferential protrusion 18. The circumferential recess 22 of the rotary operation body 19 is engaged with the projection 21. Due to the engagement between the protrusions 21 and the circumferential recess 22, the rotary operation body 19 is prevented from falling off the shaft cylinder 1.
Further, on the inner surface of the rotary operation body 19, three inner surface protrusions (engagement portions) 23 that engage / disengage with the protrusions 16 are formed, and these inner surface protrusions 23 are radially spaced at equal intervals. It is formed at the position, that is, the position of each vertex of the equilateral triangle, but it may be two places, four places, five places, etc., but they are formed at radially spaced positions. Is preferred. The protrusion 16 may be covered with a ring-shaped cylinder 24 to reduce the frictional resistance due to the engagement with the inner protrusion 23 of the rotary operation body 19. Reference numeral 25 is a fine concavo-convex portion formed on the side surface of the rotary operation body 19, and the operability when the core is drawn out by the concavo-convex portion 25 is good. In other words, it plays an anti-slip action on the finger.

Next, the operation will be described. When the rotary operation body 19 is rotated clockwise or counterclockwise from the state shown in FIG. 1 (and FIG. 11), the inner surface protrusion 23 of the rotation operation body 19 engages with the protrusion 16 of the slide member 6. . Here, when the rotary operation body 19 is further rotated, the slide member 6 moves forward against the elastic force of the elastic member 10 by the engagement between the inner surface protrusion 23 and the protrusion 16. As the slide member 6 advances, the chuck body 8 also advances, and as a result, the lead is fed out (see FIG. 12).
Further, when the rotary operation body 19 is rotated, the engagement between the inner surface protrusion 23 and the protrusion 16 is released, and as a result, the slide member 6 is restored by the elastic force of the elastic member 10. At this time, the chuck body 8 is also restored, and the core is gripped again to prevent the core from being retracted. By repeating this operation, the lead is gradually drawn out. That is, the inner core protrusion 23 of the rotary operation body 19 and the protrusion 16 of the slide member 6 are intermittently engaged / released, whereby the lead is gradually drawn out. Further, since the engagement / disengagement is intermittently performed by the above-described configuration, even if a finger or the like touches the rotary operation body 19, a reliable return operation of the slider 6 and the chuck body 8 can be obtained.
In this example, when the above-described feeding operation is performed, the inner surface 22 a of the circumferential recess 22 of the rotary operation body 19 is pressed against the inner surface 18 a of the circumferential protrusion 18 by the biasing force of the elastic member 10. However, the outer surface 22 b of the circumferential recess 22 may be pressed against the outer surface 18 b of the circumferential protrusion 18.

A second example will be described with reference to FIGS. This is a modified example for preventing the rotary operation body 19 of the first example from falling off the shaft cylinder 1. In this example, the pressing member 26 attached to the shaft cylinder 1 is brought into contact with the upper surface portion of the rotary operation body 19, but a slight gap may be provided. Although some rattling occurs, the frictional resistance is reduced and the rotary operation body 19 can be easily rotated by a light operation.
The pressing member 26 will be described in detail. The pressing member 26 includes a ring portion 27 that is fitted and fixed to the shaft tube 1 and an arm portion 28 that abuts against the rotary operation body 19. The pressing member 26 includes only the arm portion 28, and the front of the arm portion 28. The portion may be fixed to the shaft tube 1 by means such as adhesion. Moreover, you may heighten the rotation prevention effect with respect to the axial cylinder 1 of the pressing member 26 by making the fixing | fixed part of the ring part 27 and an axial cylinder each oval shape. In this example, the projections 21 and the circumferential recesses 22 formed in the first example are not formed, but these are also formed to prevent falling off and to prevent the rotating operation body 19 from swinging with respect to the shaft tube 1. The effect may be improved.

  A third example will be described with reference to FIGS. It is a modification of the pressing member and rotary operation body of the second example. The pressing member 29 in this example is fixed to the shaft tube 1 so as to straddle the rotary operation body 30, but only one side may be fixed to the shaft tube 1 as in the second example. A circular groove 31 is formed in a substantially central portion inside the pressing member 29, and a rotary shaft 32 of the rotary operation body 30 is rotatably supported in the groove 31. Reference numeral 33 denotes a fitting protrusion for fixing the pressing member 29 to the shaft tube 1. Further, in this example, the bottom surface of the rotary operation body 30 is brought into contact with the concave flat portion 34 of the shaft tube 1. That is, the rotary operation body 30 rotates while sliding on the concave flat portion 34 while being pressed by the pressing member 29.

A fourth example will be described with reference to FIGS. It is various modifications of the projection of the slide member. The example shown in FIGS. 20-21 is an example which provided the notch part 36 in the approximate center part of the flat engagement receiving part 35. FIG. When the lead is extended, the engaging portion (for example, the inner surface protrusion 23) of the rotary operation body 19 temporarily falls and engages with the cutout portion 36, so that a sense of operation is obtained and the slide member 6 ( Since the chuck body 8) can be temporarily locked in a position where the chuck body 8 is advanced, that is, in a state where the chuck body 8 is expanded, the core can be easily stored.
The example shown in FIG. 22 is an example in which linear inclined surfaces 37 are formed on both sides of the notch 36 of the previous example, but instead of the linear inclined surface 37, an arc (curved) inclined surface may be used. Good. This is an example in which the lead feeding amount can be increased. In addition, since the amount of movement of the slide member can be increased, for example, a so-called slide type core protection tube is provided in which the core protection tube provided with the core detent member is moved back and forth within the tip member by the movement of the chuck body. Even when applied to a mechanical pencil, a sufficient amount of movement can be obtained.

A fifth example will be described with reference to FIGS. It is various modifications of the internal surface protrusion of the said rotation operation body. The example shown in FIGS. 23 and 24 is an example in which a notch 38 a is formed in the inner protrusion 38 of the rotary operation body 19. As with the previous example, the slide member 6 (chuck body 8) can be temporarily locked in a position where the slide member 6 (chuck body 8) is advanced, that is, the chuck body 8 is expanded, so that the core can be easily stored. However, this notch is not always necessary. In this example, the four inner surface projections 38 are provided at equal intervals, but may be provided at unequal intervals as shown in FIG. By providing them at unequal intervals, it is possible to obtain a plurality of feeding operations at short intervals, and then obtain a feeding operation again at intervals, thereby making it easier to understand the lead feeding operation status. Even if the rotating operation body is accidentally rotated more than necessary, in this example, although the feeding operation is performed twice, after that, since the interval is open, it is possible to prevent the feeding operation more than necessary. . That is, since it takes time until the next feeding operation, an erroneous rotation operation can be recognized.
The example shown in FIGS. 26 and 27 is an example in which the inner surface protrusion (engagement receiving portion) 23 of the first example is integrated. Although a three-star inner protrusion 39 is formed, a four-star or linear engagement receiving portion 40 (see FIG. 28) may be used, and the lead feeding operation by intermittent operation can be performed by changing the shape. It can be changed as appropriate. By integrating the inner surface protrusions, the strength of the inner surface protrusions themselves can be improved.
Further, the examples shown in FIGS. 29 and 30 are examples in which the cylindrical body 24 is rotatably fitted to the outer periphery of the inner surface protrusion 23 of the rotary operation body 19. Similar to the modified example of the first example, the frictional resistance due to the engagement of the slide member 6 with the protrusion 16 is reduced.

In the above example, the engaging portion of the rotary operation body 19 has been described as the inner surface protrusion. However, as shown in the sixth example (FIGS. 31 to 32), the cam shape that becomes the engaging portion on the inner surface of the rotary operation body 19. May be formed as the cam groove 41. This will be specifically described below. A notch portion 41a is formed in each connecting portion of the cam groove 41 formed of three arc grooves as in the fourth example. The notch 41a is also a means for locking the chuck body 8 at the advanced position, and can easily store the lead.
Further, the example shown in FIG. 33 is an example in which a circular groove 42 is formed at an eccentric position of the rotary operation body 19. Also in this example, the inner surface of the circular groove 42 is formed with a notch 43 that has the same effect as the previous example. In these sixth examples, the cam groove is provided in the rotary operation body. However, the cam groove may be provided in the slide member.
As described above, in each embodiment, since the rotary operation body for performing the core feeding operation is arranged on the side surface portion of the shaft tube, the inner diameter of the core insertion hole of the slide member can be increased. Can accommodate a large number of cores.
In addition, although the lead feeding mechanism has been described as an example of the cursive unit, the present invention is not limited thereto, and for example, the cursive unit may be a ballpoint pen, a stylus pen, or the like, but to maintain a protruding state. In addition, as shown in the fifth example, it is preferable to form a notch portion that can be temporarily locked in the engagement receiving portion or the engagement portion.

The front view which shows the 1st example of this invention. The front view of FIG. The longitudinal cross-sectional view of FIG. The principal part enlarged view of FIG. FIG. 4 is a cross-sectional view taken along the line − in FIG. 3. FIG. 4 is a cross-sectional view taken along the line − in FIG. 3. The perspective view of FIG. 1 except a rotary operation body. The perspective view which shows a rotation operation body. The perspective view which shows a slide member. The cross-sectional perspective view which shows a modification. The longitudinal cross-sectional view of FIG. The longitudinal cross-sectional view which shows operation | movement. The principal part longitudinal cross-sectional view which shows a 2nd example. FIG. 14 is a cross-sectional view taken along the line − in FIG. 13. The perspective view which shows a pressing member. The principal part longitudinal cross-sectional view which shows a 3rd example. FIG. 17 is a cross-sectional view taken along the line − in FIG. 16. The perspective view except the rotation operation body of the 3rd example. (A) The side view which shows the rotary body of a 3rd example. (B) The perspective view which shows the pressing member of the 3rd example. The perspective view which shows the 4th example. The 90 degree direction inversion figure of FIG. The perspective view which shows the modification of a 4th example. The longitudinal cross-sectional view which shows a 5th example. The left view of FIG. The longitudinal cross-sectional view which shows modifications, such as a 5th example and a 1st example. The longitudinal cross-sectional view which shows the modification of a 5th example. The left view of FIG. FIG. 27 is a longitudinal sectional view corresponding to FIG. 26 showing a modification of the fifth example. The longitudinal cross-sectional view which shows the modification of a 5th example. The left view of FIG. The longitudinal cross-sectional view which shows a 6th example. The left view of FIG. The side view equivalent to FIG. 31 which shows the modification of a 6th example.

DESCRIPTION OF SYMBOLS 1 Shaft cylinder 2 Core tank part 3 Eraser 4 Cap member 5 Clip part 6 Slide member 7 Core passage hole 8 Chuck body 9 Chuck ring 10 Repulsion member 11 Core detent member 12 Tip member 13 Core protection tube 14 Grip member 15 Flat part DESCRIPTION OF SYMBOLS 16 Protrusion 17 Opening part 18 Circumferential protrusion 19 Rotating operation body 20 Circumferential groove 21 Protrusion 22 Circumferential recessed part 23 Inner surface protrusion 24 Cylinder body 25 Uneven part 26 Holding member 27 Ring part 28 Arm part 29 Holding member 30 Rotating operation body 31 Groove 32 Rotating shaft 33 Fitting projection 34 Recess flat portion 35 Engagement receiving portion 36 Notch portion 37 Inclined surface 38 Inner surface projection 39 Inner surface projection 40 Cylindrical body 41 Cam groove 42 Groove 43 Notch portion

Claims (3)

A writing instrument having a chuck body for gripping and releasing a core, and a lead feeding mechanism having a slide member with the chuck body fixed to the front end thereof, which can be moved back and forth with respect to the shaft cylinder, and is engaged with the slide member A receiving portion is provided, and an engaging portion that engages / disengages with the engaging receiving portion is provided on the operating body, and the slide member is urged rearward by a resilient member, and the front portion of the shaft tube An opening is formed on a side surface, a circumferential protrusion is formed on an outer surface of the shaft cylinder at an edge of the opening, and the operation body is fitted into the circumferential protrusion, and the operation body is Arranged so as to be rotatable with respect to the shaft cylinder, the engagement receiving portion and the engagement portion are engaged / disengaged by rotation of the operating body, and the engagement receiving portion and the engagement portion The slide member moves forward against the elastic force of the elastic member by the engagement of the engagement member, and the engagement receiving portion and the engagement Writing instrument characterized by retracting the slide member by the elastic force of the elastic member by the non-engagement with. A plurality of the engaging portions are provided, and the engaging portions are arranged at radially equidistant positions from the rotation center of the operating body, and the engaging portions are arranged at equidistant positions. The writing instrument according to claim 1. The writing instrument according to claim 1, wherein a notch portion is formed in the engagement portion, and the engagement receiving portion can be temporarily locked in the notch portion .

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