JP2011025616A - Writing utensil - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To overcome the problem that, when manufacturing various components as molded products, molds are complicated requiring resultant time and labor, furthermore the calculation for meshing accuracy is hard due to the presence of a plurality of gears and saw teeth, and product accuracy deteriorates. <P>SOLUTION: In the writing utensil, a shaft body has a writing body therein, the front tip of the writing body is connected to the rear end thereof, a slide projection is engaged slidably in the center shaft direction of the shaft body along the slide groove provided to the shaft body, and a slider exposed from the outer circumferential face of a shaft cylinder. When the slider is at an advancing position, the writing body is projected from the shaft body, while the writing boy is submerged into the shaft body when the slider is at a retreated position. A slide groove provided on the shaft body is formed in a substantially one straight line, and the slider has a projection limiting a movement of the shaft body to the center shaft line direction. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention has a writing body in the shaft body, and the writing body is urged rearward by an elastic member, and a slider attached to the rear end of the writing body is advanced, and the slider is moved to the shaft body. It is related with the writing instrument which made the said writing body protrude from a shaft main body by engaging. Examples of the cursive include a ballpoint pen refill, a mechanical pencil unit, and a stylus pen.

  As an example of this type of writing instrument, by pushing down an arbitrary slider (presser), the tip of the desired writing body can be projected from the tip of the shaft tube, and by pushing down the other slider lightly, the shaft tube The tip of the cursive body can be quickly stored by spring force inside, and a pair of left and right slide pieces extending in the longitudinal direction are provided on both sides of the slider, and each slide piece is provided inside the shaft cylinder. There is a writing instrument that is configured to slide in a concave guide rail and that can slide the slider in the front-rear direction with the cooperation of the slide piece and the guide rail.

When the writing tool slides the pusher from the retracted position to the advanced position, the clip with an opening / closing operation function moves the shaft in the centripetal direction at the advanced position, thereby locking the pusher (slider) in the axial cylinder, The forward movement position in which the writing body is protruded from the shaft cylinder is maintained by this locked state. When the clip with the opening / closing operation function is knocked at this forward position, the mechanical pencil unit is engaged with the inside of the shaft tube so that the lead core is extended. When the pusher is locked at the forward movement position, the side surface of the pusher and the shaft tube are close to or in contact with each other by the protrusion.
In addition, this writing instrument is integrally provided with a clip with an opening / closing operation function on a specific slider.

JP-A-2005-111876.

However, in the prior art described in Japanese Patent Application Laid-Open No. 2005-1111876, a locking portion 12 for engaging a pusher (slider) of a clip with an opening / closing operation function or another pusher (slider) is formed. Yes. The locking portion 12 is formed in a stepped shape on the inner peripheral surface of the shaft cylinder so as to lock the rear end portion of the pusher when it sinks in the axial direction of the shaft cylinder at the pusher advance position. Has been. And two this latching | locking parts 12 are arrange | positioned so that it may latch with respect to the both side surfaces of the rear-end part of each pusher for every pusher. Further, a protrusion is formed on the front side of each locking portion 12 so as to be close to or in contact with the side surface of the pusher when locked to the locking portion 12.
That is, in the above configuration, since the pusher moves back and forth, the shaft cylinder side is locked when the pusher is in the retracted position and when the pusher sinks in the shaft cylinder axis direction at the advanced position. On the front side of the portion 12, there is a slide surface on which a protrusion is formed so as to be close to or in contact with the side surface of the presser when locked to the locking portion 12, and is provided in these two stepped shapes It has a sliding surface. As a result, the outer diameter of the shaft tube becomes thick, so that the appearance and portability are poor.

  Furthermore, the guide wall provided on the outer peripheral surface of the shaft cylinder has a function of preventing rattling during the sliding of the clip with the opening / closing function and a function of regulating the opening operation during the sliding of the clip with the opening / closing function. Nevertheless, as described above, the clip pusher with an opening / closing function is configured so that the protrusion formed on the front side of the locking portion 12 of the shaft cylinder and the side face are close to or in contact with each other. Fine dimensional management is required. Also, since the clip with the opening / closing function is provided integrally with the pusher, the contact area between the clip with the opening / closing function and the shaft cylinder is large, the resistance feeling during sliding from the retracted position to the advanced position, and the forward position There is also a sense of resistance in the knocking operation in which the refill for mechanical pencil pulls out the lead lead, and the operability is difficult.

  The present invention has a writing body in a shaft body, a front end is connected to a rear end of the writing body, and is slidable in a central axis direction of the shaft body along a sliding groove provided in the shaft body. And a slider exposed from the outer peripheral surface of the shaft tube, and a writing body protruding from the shaft body when the slider is advanced, while the slider is exposed when the slider is retracted. In the writing instrument in which the writing body is immersed in the shaft main body, the sliding groove provided in the shaft main body is formed in a substantially straight line, and the slider is in the direction of the central axis of the shaft main body. The first gist is that a protrusion for restricting the movement of the writing body is formed, the writing body is provided in the shaft body, the front end is connected to the rear end of the writing body, and is provided on the shaft body. In the direction of the central axis of the shaft body along the sliding groove The sliding projection engages freely, and the slider exposed from the outer peripheral surface of the shaft cylinder and the writing body project from the shaft main body when the slider is advanced, while the slider is retracted. In the writing instrument in which the writing body is immersed in the shaft main body, the slide groove provided in the shaft main body is formed in a substantially straight line, and a substantially groove-shaped guide is formed on the side surface of the slider. A second gist is that a rail is formed, and an inner surface protrusion that enters the guide rail and slides in the guide rail protrudes from the shaft body.

  The present invention has a writing body in a shaft body, a front end is connected to a rear end of the writing body, and is slidable in a central axis direction of the shaft body along a sliding groove provided in the shaft body. And a slider exposed from the outer peripheral surface of the shaft tube, and a writing body protruding from the shaft body when the slider is advanced, while the slider is exposed when the slider is retracted. In the writing instrument in which the writing body is immersed in the shaft main body, the sliding groove provided in the shaft main body is formed in a substantially straight line, and the slider is in the direction of the central axis of the shaft main body. The first gist is that a protrusion for restricting the movement of the writing body is formed, the writing body is provided in the shaft body, the front end is connected to the rear end of the writing body, and is provided on the shaft body. In the direction of the central axis of the shaft body along the sliding groove The sliding projection engages freely, and the slider exposed from the outer peripheral surface of the shaft cylinder and the writing body project from the shaft main body when the slider is advanced, while the slider is retracted. In the writing instrument in which the writing body is immersed in the shaft main body, the slide groove provided in the shaft main body is formed in a substantially straight line, and a substantially groove-shaped guide is formed on the side surface of the slider. A rail is formed, and the shaft main body is formed with a protruding inner surface projecting into the guide rail and sliding in the guide rail. Thus, it is possible to provide a writing instrument that has good operability and good portability, and has operability with low sliding resistance of the slider.

The external appearance front view which shows the 1st example of this invention. The side view of FIG. The longitudinal cross-sectional view of FIG. The longitudinal cross-sectional view of a mechanical pencil unit. The top view of FIG. The WW sectional view taken on the line of FIG. XX sectional drawing of FIG. The YY sectional view taken on the line of FIG. FIG. 6 is a sectional view taken along line ZZ in FIG. 5. The external appearance perspective view which shows the connection state of a ball-point pen refill, a connection member, and a slider. The disassembled principal part enlarged view in FIG. The front view of a slider. The external appearance perspective view of a connection member. The front view of a connection member. The side view of FIG. The external appearance perspective view which shows the connection state of a mechanical pencil unit, a connection member, and a slider. FIG. 17 is an enlarged view of essential parts in FIG. 16. AA line sectional view of Drawing 10 and Drawing 16. BB sectional drawing of FIG. 10, FIG. The external view which shows the case where a connection member and a slider are united. (A) Front view (b) Side view (c) External perspective view The external appearance perspective view at the time of uniting a connection member and a slider. The external appearance perspective view which shows the connection state of a connection member and a cursive body. The external appearance perspective view which shows a 1st example. (A) Slider backward position (b) Slider forward position The longitudinal cross-sectional view of FIG.23 (b). The external appearance perspective view of the slider which shows a 2nd example. The external appearance perspective view which shows the 2nd example. (A) Slider backward position (b) Slider forward position The external appearance perspective view of the slider which shows a 3rd example. External perspective view of slider advance state showing third example The longitudinal cross-sectional view which shows a 3rd example. (A) Slider backward position (b) Slider forward position The external appearance perspective view of the slider which shows the 4th example. The external appearance perspective view which shows the 4th example. (A) Slider backward position (b) Slider forward position A longitudinal sectional view of FIG. The external appearance perspective view of the slider which shows a 5th example. (A) Right direction external perspective view. (B) Left direction external perspective view. The external appearance perspective view which shows the 5th example. (A) Slider backward position (b) Slider forward position The external appearance perspective view of the slider which shows a 6th example. The external appearance perspective view which shows the 6th example. (A) Slider backward position (b) Slider forward position

The operation will be described. Since the sliding groove provided in the shaft main body with which the slider sliding protrusion engages is formed in a substantially straight line, the outer diameter of the shaft main body is not increased and the portability is improved.
Example 1
A first example will be described with reference to FIGS. In the figure, the lower part is called the front and the upper part is called the rear. An example is a multi-core writing instrument in which a ballpoint pen refill composed of two colors, black and red, and a mechanical pencil unit are slidably arranged. Reference numeral 1 denotes a shaft main body, and the shaft main body 1 includes a front shaft 2 and a rear shaft 3. Further, in this example, the front shaft 2 is constituted by a screwed structure of the tip member 4 and the middle shaft 5, but may be press-fitted by uneven fitting or may be integrally formed. However, considering the ease of exchanging the cursive and the molding described later, it is better to use two members and fix them detachably. In addition, a conical portion 4a whose diameter gradually decreases toward the distal end side is formed in the inner diameter portion of the tip member 4. A protruding hole 4b in which the cursive body appears and disappears is formed at the tip of the tip member 4.

The rear shaft 3 is formed with three slits 6 in the longitudinal direction. In this example, three slits 6 are formed, because the number of ballpoint pen refills that are cursive letters is two and the number of mechanical pencil units is one, depending on the number of cursive letters. The number of slits formed also varies. The slit 6 is formed up to one end of the rear shaft 3, and sliding grooves 7 are formed on both sides of the slit 6. The rear shaft 3 is formed with a slide surface 3a having substantially the same length as the slide groove 7 in the longitudinal direction. However, the sliding groove 7 and the sliding surface 3a are not formed over the entire length of both sides of the slit 6, but are formed only up to the middle portion. The slide surface 3a receives the back surface of a slide projection 12 described later.
In front of the rear shaft 3, leg portions 8 having a semicircular shape with a cross-sectional shape having an arcuate portion on the outside are formed at intervals of 120 °. The leg portion 8 is formed by forming the slit 6. Therefore, the number of legs 8 varies depending on the number of cursive letters. The circumscribed circle diameter of the leg portion 8 is formed smaller than the maximum outer diameter of the rear shaft 3.
Reference numeral 9 denotes a clip portion formed integrally with the rear shaft 3, but it may be formed of a separate member and fixed to the rear shaft 3. Reference numeral 10 denotes a ball portion formed on the front inner surface of the clip portion 9, and the ball portion 10 is in contact with the surface of the middle shaft 5.

A slider 11 made of a transparent or colored translucent material is slidably disposed in the slit 6 of the rear shaft 3. The slider 11 includes a slider 11B for ballpoint pen refill and a slider 11S for a mechanical pencil unit. Sliding projections 12 are formed on both sides of the sliders 11B and 11S in the longitudinal direction, and are slidably engaged with the sliding grooves 7 formed in the slit 6. Two release protrusions 13 and 14 are formed on the rear surfaces of the sliders 11B and S at an interval, and a hole 11a is formed in the longitudinal direction inside the front of the sliders 11B and 11S. . A planar portion 11b is formed on the inner surface of the hole 11a when viewed from the front direction, and an arcuate curved surface portion 11c is formed on the outer surfaces of the sliders 11B and 11S corresponding to the planar portion 11b. The flat surface portion 11b formed on the inner surface and the curved surface portion 11c formed on the outer surface cause refraction of light and obtain a lens effect.
The slider 11S is formed with a substantially hemispherical flange portion 11Sd having a width substantially larger than the width of the slit 6. By widening the flange portion 11Sd, the projecting operation of the mechanical pencil unit is improved and the centering operation can be easily performed. In addition, the slider 11S moves in the axial direction of the rear shaft 3 during the centering operation. Prevent immersion.
Then, one end portion (rear portion 15a) of the connecting member 15 having a color substantially the same as the color of the ink stored in the later-described cursive body is detachably inserted into the hole 11a of the slider 11B. A cylindrical ball-point pen refill 16B made of a resin material such as polypropylene or nylon is connected to the other end portion (front portion 15b) of the connecting member 15. On the other hand, one end portion (rear portion 15a) of the connecting member 15 having a color substantially the same as the color of the core used for the mechanical pencil or displaying the core diameter is attached to and detached from the hole 11a of the slider 11S. A core tank 161 of a cylindrical mechanical pencil unit 16S made of a resin material such as polypropylene or nylon or a metal material is connected to the other end portion (front portion 15b) of the connection member 15. Has been.

The ball-point pen refill 16B includes an ink storage tube 16Ba formed by extrusion molding with a resin material such as polypropylene that stores ink, and a ball-point pen tip 16Bb press-fitted in front of the ink storage tube 16Ba. . The mechanical pencil unit 16S includes a lead tank 161 that contains a plurality of cores and is formed of a resin material such as polypropylene or a metal material, and a lead grip attached to the front of the lead tank 161 via a joint member 162. A chuck body 163 that opens and closes, a chuck ring 164 that surrounds the front of the chuck body 163 and opens and closes the chuck body 163, a guide cylinder 166 that is disposed so as to cover the chuck body 163, and The elastic member 166 is disposed between the guide tube 166 and the joint member 162, and includes a resilient member 166 made of a coil spring or the like that urges the chuck body 163 and the core tank 161 rearward. Further, a tip member 167 is detachably attached to the tip of the guide tube 165 by means such as screwing, and the rearward movement of the lead core is restricted inside the tip member 167. A core detent member 168 made of a rubber-like elastic body is provided.
Here, since the sliders 11B and 11S are formed of a transparent or colored translucent material, it is possible to easily identify the color and display of the connecting member 15 located inside the sliders 11B and 11S. In addition to this, the sliders 11B and 11S have a flat surface portion 11b and a curved surface portion 11c, so that the color of the connecting member 15 can be more easily identified by the lens effect obtained thereby. .

A large-diameter portion 15c is formed in the intermediate portion of the connecting member 15, and excessive insertion of the rear portion 15a into the hole 11a and excessive insertion of the front portion 15b into the writing body 16B or 16S are prevented. Yes. In addition, a circumferential fitting projection 15d is formed on the rear portion 15a of the connecting member 15 in order to improve the insertion and fitting of the sliders 11B and 11S into the holes 11a, while the front portion 15b. Is formed with a plane portion 15e through which air enters the cursive bodies 16B and 11S. The flat portion 15e is formed in four directions with an angle of 90 degrees. That is, the cross-sectional shape of the front portion 15b of the connection member 15 is a square shape. Further, in order to obtain good engagement / fitting force with the writing bodies 16B and 16S, the four flat portions 15e are partially formed with protrusions 15f and 15g, but the protrusions do not overlap each other. ing. That is, each of the protrusions 15f formed on the four plane portions 15e is formed at different positions with respect to the longitudinal direction and the circumferential direction. Specifically, the protrusions 15f are formed at the front facing positions. A projection 15g is formed on the rear side of the projection 15f so as to face the projection 15f at an angle of 90 degrees. The ball pen refills 16B and 11S are surely infiltrated into the interior of the ballpoint pen refills 16B and 11S due to the consumption of the ink, and the writing body 16Ba made of a resin material and the drop off from the connecting member 15 due to plastic deformation of the core tank 161 are prevented. Yes. That is, the ball-point refill 16Ba and the lead tank 161 bulge in an elliptical shape by the protrusion 15f formed in the front (the bulging portion 16Bc and the lead tank saves power), and the protrusion 15g formed in the rear causes the The bulging part is also formed with the bulging part 16Bd at an angle of 90 degrees. That is, while the bulging direction and the direction rotated 90 degrees are reduced in diameter, the curled body 16B and the inner surface of the core tank 161 bite into the protrusions 15f and 15g. Each engaging portion becomes stronger (see FIGS. 18 and 19; the dotted line 16Be in the figure is the inner shape of the original writing body 16B).
The protrusions 15f and 15g have an arrow shape in cross section, but the insertion side of the protrusion 15f located on the front side to the ballpoint pen refill 16 is formed at an obtuse angle (α). The separation side is formed at an acute angle (β). Incidentally, in this example, the insertion side is formed at about 150 degrees and the separation side is formed at 70 degrees.

An extension portion 11d that holds an outer diameter portion of an elastic member 17 to be described later is formed at the front end portions of the sliders 11B and 11S. The length between the extending portions 11d is formed slightly shorter than the outer diameter of the elastic member 17 so that the elastic member 17 is press-fitted into the extending portion 11d. That is, even when the ballpoint pen refill 16B and the mechanical pencil unit 16S are replaced, the elastic member 17 is prevented from being detached from the front end portions of the sliders 11B and 11S. Further, the insertion force (fitting force) of the sliders 11B and 11S with respect to the connection member 15 (rear part 15a) is greater than the insertion force (fitting force) of the ball pen refill 16B and the mechanical pencil unit 16S with respect to the connection member 15 (front part 15b). Is set too weak. That is, when the writing bodies 16B and 16S are to be separated from the sliders 11B and 11S, the ball pen refill 16B and the connection member 15 are separated from the sliders 11B and 11S in a state where the mechanical pencil unit 16S and the connection member 15 are coupled. .
Reference numeral 17 denotes a ball-point refill 16B and a resilient member such as a coil spring that urges the slider 11B connected to the ball-pen refill 16 or the mechanical pencil unit 16S and the slider 11S connected to the mechanical pencil unit 16S backward.

Regarding the relationship between the slider 11B or 11S and the connecting member 15, the slider 11B or 11S may be integrally formed with the connecting member 15. Hereinafter, it will be described in detail with reference to FIGS.
20 to 22 illustrate specific examples of the ballpoint pen slider 11B, but this configuration may be applied to the slider 11S. A sliding protrusion 12 is formed on the rear side surface of the connecting member 21 having a function as a slider, and release protrusions 13 and 14 are formed on the back surface. On the other hand, the front portion 21b of the connecting member 21 is formed with a flat portion 21e for allowing air to enter the writing body 16B. The flat portion 21e is formed in four directions with an angle of 90 degrees. That is, the cross-sectional shape of the front portion 21b of the connecting member 21 is a square shape. Further, the four flat portions 21e are partially formed with protrusions 21f and 21g in order to obtain a good fitting force with the writing body 16Ba, but the protrusions do not overlap each other. That is, each of the protrusions 21f formed on the four plane portions 21e is formed at different positions with respect to the longitudinal direction and the circumferential direction. Specifically, the protrusions 21f are formed at the front facing positions. A projection 21g is formed on the rear side of the projection 21f so as to face the projection 21f at an angle of 90 degrees. In order to more firmly engage the writing body 16Ba and the connection member 21, they may be crimped (not shown).
By providing the connecting member with a slider function as in this example, the number of parts can be reduced, and man-hours for assembly can be reduced.

  Next, the middle shaft 5 will be specifically described. A restricting portion 18 is formed in an intermediate portion of the middle shaft 5 which is one member of the front shaft 2, and three through holes 19 into which the writing bodies 16 </ b> B and 16 </ b> S are loosely inserted are formed in the restricting portion 18. The curling bodies 16B and 16S are urged rearward by locking one end of the elastic member 17 to the restricting portion 18. In addition, three grooves 20 are formed in the longitudinal direction inside the middle shaft 5 and behind the restricting portion 18, and the legs 8 of the rear shaft 3 are slidably contacted with the grooves 20. 8 is guided. Further, the groove portion 20 has substantially the same shape as the cross-sectional shape of the leg portion 8. That is, it has a half-moon shape having an arc portion on the outside.

Next, the operation will be described with reference to FIG. 3, FIG. 23 and FIG. When the slider 11S is pressed forward (in the diagonally upper left direction in FIG. 23), the slider 11S moves forward with the mechanical pencil unit 16S while being guided by the slit 6 and the sliding groove 7 of the rear shaft 3, and the mechanical pencil unit 16S The tip protrudes from the tip of the shaft body 1 (the protruding state is not shown). At the same time, the slider 11S is pushed in the axial direction, which is the inner side of the rear shaft 3. However, the flange portion 11Sd comes into contact with the outer peripheral surfaces on both sides of the slit 6 of the rear shaft 3, and the pushing of the slider S is restricted. Next, the rear end (upward in FIG. 24) of the sliding protrusion 12 formed on the side surface portion of the slider 11S engages with the front end portion of the sliding groove 7 to prevent the mechanical pencil unit 16S from retreating, The forward position of the mechanical pencil unit 16S is maintained. That is, by forming the sliding groove 7 only up to the middle portion of the slit 6, the slider 11S is also engaged.
When the upper end 11Se of the flange portion 11Sd of the slider 11S is pressed forward in the forward position where the tip of the mechanical pencil unit 16S protrudes from the tip of the shaft body 1, the tip member 167 of the mechanical pencil unit 16S is moved to the tip member. 4 abuts against the conical portion 4a, the diameter of which gradually decreases toward the distal end side of the inner diameter portion, and the forward movement of the mechanical pencil unit 16S is prevented. Here, when the slider 11S is further pressed, the lead tank 161 and the chuck body 163 move forward against the elastic force of the elastic member 166, and thereby the lead is extended.
In the course of the center feeding operation, the flange portion 11Sd of the slider 11S is in sliding contact with the outer peripheral surface of the rear shaft 3. Therefore, in order to receive the sliding projection 12 of the slider 11S as shown in the prior art, it is necessary to provide a further sliding groove or sliding surface on the axial direction side of the sliding groove 7 of the rear shaft 3. There is no.

  Next, when the mechanical pencil unit 16S is to be stored in the shaft body 1, the other slider 11B is pressed. When the other slider 11B is pressed, the release protrusions 13 and 14 formed on the back surfaces of the sliders 11S and 11B collide with each other. By this collision action, the slider 11 </ b> S being pressed is pressed toward the outside of the rear shaft 3. Then, by this pressing action, the engagement between the sliding projection 12 of the slider 11S and the sliding groove 7 is released, and the mechanical pencil unit 16S which is in the projecting state by the releasing action is caused by the action of the elastic member 17. The slider 11S moves backward and is immersed in the shaft body 1, and the slider 11S returns to the original retracted position.

(Example 2)
A second example will be described with reference to FIGS. This is a modification of the slider 11S of the first example. This will be specifically described below. Sliding projections 12 are formed on both side surfaces of the slider 11S, and release projections 13 and 14 are formed on the back surface. Further, a rectangular protrusion 11Sf that is substantially smaller than the width of the slit 6 of the rear shaft 3 is formed behind the slider 11S. The projecting piece 11Sf is exposed to the outer peripheral surface of the rear shaft 3 when the slider 11S is in the retracted position.

Next, the operation will be described with reference to FIG. When the slider 11S is pressed forward (upwardly diagonally to the left in FIG. 26), the slider 11S moves forward with the mechanical pencil unit 16S while being guided by the slit 6 and the sliding groove 7 of the rear shaft 3, and the mechanical pencil unit 16S The tip protrudes from the tip of the shaft body 1. At the same time, the slider 11S is pushed in the axial direction, which is the inner side of the rear shaft 3, but the projecting piece 11Sf formed on the rear side comes into contact with the slide surface 3a of the rear shaft 3 and the pushing is restricted. Next, the rear end of the sliding projection 12 formed on the side surface portion of the slider 11S engages with the front end portion of the sliding groove 7 to prevent the mechanical pencil unit 16S from retreating, and the mechanical pencil unit 16S advances. The position is maintained. In other words, the sliding groove 7 is formed only up to the middle part of the slit 6 so that it also serves as the engagement of the slider 11S (this engagement state is the same as in the first example). Not shown).
When the upper end 11Se of the flange portion 11Sd of the slider 11S is pressed forward in the forward position where the tip of the mechanical pencil unit 16S protrudes from the tip of the shaft body 1, the tip member 167 of the mechanical pencil unit 16S is moved to the tip member. 4 abuts against the conical portion 4a, the diameter of which gradually decreases toward the distal end side of the inner diameter portion, and the forward movement of the mechanical pencil unit 16S is prevented. Here, when the slider 11S is further pressed, the lead tank 161 and the chuck body 163 move forward against the elastic force of the elastic member 166, and thereby the lead is extended.
In the course of this lead-out operation, the projecting piece 11Sf of the slider 11S is in sliding contact with the slide surface 3a of the rear shaft 3. Therefore, the axial direction side (inward side) of the sliding groove 7 of the rear shaft 3 to receive the sliding projection 12 of the slider 11S and the back surface of the sliding projection 12 as shown in the prior art. Further, it is not necessary to provide a further slide groove 7 or slide surface 3a.
If the mechanical pencil unit 16S is to be stored in the shaft main body 1, it is the same as in the first example.

(Example 3)
A third example will be described with reference to FIGS. This is a modification of the slider 11S of the first example. This will be specifically described below. Sliding projections 12 are formed on both side surfaces of the slider 11S, and release projections 13 and 14 are formed on the back surface. On the rear end surface of the slider 11S, a rod-shaped protrusion 11Sh narrower than the width of the slider 11S is formed. The protrusion 11Sh is housed in the interior 3b of the rear shaft 3 when the slider 11S is in the retracted position. That is, it is not exposed on the outer peripheral surface of the rear shaft 3.

Next, the operation will be described with reference to FIG. 3, FIG. 28 and FIG. When the slider 11S is pressed forward (upward and diagonally to the right in FIG. 28), the slider 11S moves forward with the mechanical pencil unit 16S while being guided by the slit 6 and the sliding groove 7 of the rear shaft 3, and the mechanical pencil unit 16S The tip protrudes from the tip of the shaft body 1 (the protruding state is not shown). At the same time, the slider 11S is pushed in the axial direction, which is the inner side of the rear shaft 3, but the protrusion 11Sh formed on the rear end surface comes into contact with the release protrusion 13 of the other slider 11B, and the pushing of the slider 11S is restricted. Is done. Next, the rear end of the sliding projection 12 formed on the side surface portion of the slider 11S engages with the front end portion of the sliding groove 7 to prevent the mechanical pencil unit 16S from retreating, and the mechanical pencil unit 16S advances. The position is maintained. In other words, the sliding groove 7 is formed only up to the middle part of the slit 6 so that it also serves as the engagement of the slider 11S (this engagement state is the same as in the first example). Not shown).
When the upper portion 11Si of the slider 11S is knocked forward in the forward position where the tip of the mechanical pencil unit 16S protrudes from the tip of the shaft body 1, the tip member 167 of the mechanical pencil unit 16S is moved to the inner diameter portion of the tip member 4 This abuts against the conical portion 4a whose diameter gradually decreases toward the tip side, and the forward movement of the mechanical pencil unit 16S is prevented. Here, when the slider 11S is further pressed, the lead tank 161 and the chuck body 163 move forward against the elastic force of the elastic member 166, and thereby the lead is extended.
In the course of this lead-out operation, the protrusion 11Sh of the slider 11S is in sliding contact with the release protrusion 13 of the other slider 11B. Therefore, the axial direction side (inward side) of the sliding groove 7 of the rear shaft 3 to receive the sliding projection 12 of the slider 11S and the back surface of the sliding projection 12 as shown in the prior art. Further, it is not necessary to provide a further slide groove 7 or slide surface 3a.
If the mechanical pencil unit 16S is to be stored in the shaft main body 1, it is the same as in the first example.

Example 4
A fourth example will be described with reference to FIGS. 30, 31, and 32. FIG. This is a modification of the slider 11S of the first example. This will be specifically described below. Sliding projections 12 are formed on both side surfaces of the slider 11S, and release projections 13 and 14 are formed on the back surface. A substantially square-shaped protruding piece 11Sj is formed on both side portions on the rear side of the slider 11S. The protruding piece 11Sj is accommodated in the interior 3c of the rear shaft 3 when the slider 11S is in the retracted position. That is, it is not exposed on the outer peripheral surface of the rear shaft 3.

Next, the operation will be described with reference to FIGS. When the slider 11S is pressed forward (upwardly diagonally to the left in FIG. 31), the slider 11S moves forward with the mechanical pencil unit 16S while being guided by the slit 6 and the sliding groove 7 of the rear shaft 3, and the mechanical pencil unit 16S The tip protrudes from the tip of the shaft body 1 (the protruding state is not shown). At the same time, the slider 11S is pushed in the axial direction, which is the inner side of the rear shaft 3, but the projecting piece 11Sj formed on the rear part comes into contact with the slide surface 3a of the rear shaft 3, and the pushing of the slider 11S is restricted. The Next, the rear end of the sliding projection 12 formed on the side surface portion of the slider 11S engages with the front end portion of the sliding groove 7 to prevent the mechanical pencil unit 16S from retreating, and the mechanical pencil unit 16S advances. The position is maintained. In other words, the sliding groove 7 is formed only up to the middle part of the slit 6 so that it also serves as the engagement of the slider 11S (this engagement state is the same as in the first example). Not shown).
When the upper portion 11Sk of the slider 11S is knocked forward in the forward position where the tip of the mechanical pencil unit 16S protrudes from the tip of the shaft body 1, the tip member 167 of the mechanical pencil unit 16S is moved to the inner diameter portion of the tip member 4 This abuts against the conical portion 4a whose diameter gradually decreases toward the tip side, and the forward movement of the mechanical pencil unit 16S is prevented. Here, when the slider 11S is further pressed, the lead tank 161 and the chuck body 163 move forward against the elastic force of the elastic member 166, and thereby the lead is extended. In the course of the center feeding operation, the projecting piece 11Sj of the slider 11S is in sliding contact with the slide surface 3a of the rear shaft 3. Therefore, the axial direction side (inward side) of the sliding groove 7 of the rear shaft 3 to receive the sliding projection 12 of the slider 11S and the back surface of the sliding projection 12 as shown in the prior art. Further, it is not necessary to provide a further slide groove 7 or slide surface 3a.
If the mechanical pencil unit 16S is to be stored in the shaft main body 1, it is the same as in the first example.

(Example 5)
A fifth example will be described with reference to FIGS. This is a modification of the slider 11S and the rear shaft 3 of the first example. This will be specifically described below. Sliding projections 12 are formed on both side surfaces of the slider 11S, and release projections 13 and 14 are formed on the back surface. At least one notch groove 11Sl is formed on both side surfaces of the portion where the slider 11S is exposed from the slit 6 of the rear shaft 3 (FIGS. 33 and 34 show a case where there are two notch grooves 11Sl. ing.). The groove width of the notch groove 11Sl is substantially larger than the thickness of an inner surface protrusion 3d of the rear shaft 3 described later.
On the other hand, inner surface protrusions 3 d are provided on both sides of the slit 6 of the rear shaft 3. The inner surface protrusion 3d is provided on the middle shaft 5 side. Moreover, the thickness of the inner surface protrusion 3d is substantially smaller than the notch groove 11Sl. Therefore, the inner surface protrusion 3d can fit in the notch groove 11Sl and slide.

Next, the operation will be described with reference to FIGS. When the slider 11S is pressed forward (upwardly diagonally to the left in FIG. 34), the slider 11S moves forward with the mechanical pencil unit 16S while being guided by the slit 6 and the sliding groove 7 of the rear shaft 3, and the mechanical pencil unit 16S The tip protrudes from the tip of the shaft body 1 (the protruding state is not shown). At the same time, the slider 11S is pushed in the axial direction, which is the inner side of the rear shaft 3, but the notch groove 11Sl is fitted into the convex portion 3d of the rear shaft 3, and as a result, the pushing of the slider 11S is restricted. . Next, the rear end of the sliding projection 12 formed on the side surface portion of the slider 11S engages with the front end portion of the sliding groove 7 to prevent the mechanical pencil unit 16S from retreating, and the mechanical pencil unit 16S advances. The position is maintained. In other words, the sliding groove 7 is formed only up to the middle part of the slit 6 so that it also serves as the engagement of the slider 11S (this engagement state is the same as in the first example). Not shown).
When the upper portion 11Sm of the slider 11S is knocked forward in the forward position where the tip of the mechanical pencil unit 16S protrudes from the tip of the shaft body 1, the tip member 167 of the mechanical pencil unit 16S is moved to the inner diameter portion of the tip member 4 This abuts against the conical portion 4a whose diameter gradually decreases toward the tip side, and the forward movement of the mechanical pencil unit 16S is prevented. Here, when the slider 11S is further pressed, the lead tank 161 and the chuck body 163 move forward against the elastic force of the elastic member 166, and thereby the lead is extended. In the course of this lead-out operation, the notch groove 11Sl of the slider 11S fits and slides on the inner surface protrusion 3d of the rear shaft 3. Therefore, the axial direction side (inward side) of the sliding groove 7 of the rear shaft 3 to receive the sliding projection 12 of the slider 11S and the back surface of the sliding projection 12 as shown in the prior art. Further, it is not necessary to provide a further slide groove 7 or slide surface 3a.
If the mechanical pencil unit 16S is to be stored in the shaft main body 1, it is the same as in the first example.

(Example 6)
A sixth example will be described with reference to FIGS. This is a modification of the slider 11S and the rear shaft 3 of the first example. This will be specifically described below. Sliding projections 12 are formed on both side surfaces of the slider 11S, and release projections 13 and 14 are formed on the back surface. At least one convex portion 11Sn is formed on both side surfaces of the portion where the slider 11S is exposed from the slit 6 of the rear shaft 3. The shape of the convex portion 11Sn is a cylindrical shape in FIG. 35, but may be a polygonal shape (FIGS. 35 and 36 show a case where there are two convex portions 11Sn). The outer diameter of the convex portion 11Sn is substantially smaller than the groove width of a groove portion 3e of the rear shaft 3 described later.
On the other hand, groove portions 3 e are provided on both sides of the slit 6 of the rear shaft 3. The groove portion 3e is provided on the middle shaft 5 side. Moreover, the groove width of the groove part 3e is substantially larger than the said convex part 11Sn. Therefore, the convex portion 11Sn can be slid by fitting into the groove portion 3e.

Next, the operation will be described with reference to FIGS. When the slider 11S is pressed forward (diagonally downward to the right in FIG. 36), the slider 11S moves forward with the mechanical pencil unit 16S while being guided by the slit 6 and the sliding groove 7 of the rear shaft 3, and the mechanical pencil unit 16S The tip protrudes from the tip of the shaft body 1 (the protruding state is not shown). At the same time, the slider 11S is pushed in the axial direction, which is the inner side of the rear shaft 3, but the convex portion 11Sn fits into the groove portion 3e of the rear shaft 3, and as a result, the pushing of the slider 11S is restricted. Next, the rear end of the sliding projection 12 formed on the side surface portion of the slider 11S engages with the front end portion of the sliding groove 7 to prevent the mechanical pencil unit 16S from retreating, and the mechanical pencil unit 16S advances. The position is maintained. In other words, the sliding groove 7 is formed only up to the middle part of the slit 6 so that it also serves as the engagement of the slider 11S (this engagement state is the same as in the first example). Not shown).
When the upper end 11So of the slider 11S is knocked forward in the forward position where the tip of the mechanical pencil unit 16S protrudes from the tip of the shaft body 1, the tip member 167 of the mechanical pencil unit 16S is moved to the inner diameter portion of the tip member 4 This abuts against the conical portion 4a whose diameter gradually decreases toward the tip side, and the forward movement of the mechanical pencil unit 16S is prevented. Here, when the slider 11S is further pressed, the lead tank 161 and the chuck body 163 move forward against the elastic force of the elastic member 166, and thereby the lead is extended. During the lead lead-out operation, the projecting portion 11Sn of the slider 11S fits into the groove 3e of the rear shaft 3 during the knocking operation and slides during the knocking operation. Therefore, the axial direction side (inward side) of the sliding groove 7 of the rear shaft 3 to receive the sliding projection 12 of the slider 11S and the back surface of the sliding projection 12 as shown in the prior art. Further, it is not necessary to provide a further slide groove 7 or slide surface 3a.
If the mechanical pencil unit 16S is to be stored in the shaft main body 1, it is the same as in the first example.

DESCRIPTION OF SYMBOLS 1 axis | shaft main body 2 front axis | shaft 3 back axis | shaft 3a slide surface 3b inside 3c inside 3d inner surface protrusion 3e groove part 4 tip member 4a conical part 4b protrusion hole 5 middle shaft 6 slit 7 sliding groove 8 leg part 9 clip part 10 ball part 11 slider 11a hole 11b flat surface portion 11c arc-shaped curved surface portion 11B slider for ball pen refill 11S slider for mechanical pencil unit 11Sd collar portion 11Se upper portion 11Se hole 11b flat surface portion 11c arc-shaped curved surface portion 11d extending portion 11Sf upper portion 11Sg upper portion 11Sg Projection 11Si Upper part 11Sj Projection piece 11Sk Upper part 11Sl Notch groove 11Sm Upper part 11Sn Projection part 11So Upper part 12 Sliding projection 13 Release projection 14 Release projection 15 Connection member 15a Rear part 15b Front part 15c Large diameter part 15d Flat part 15e Flat part 15e 15 Projection 15g Projection 16B Ballpoint pen refill 16Ba Ink receiving tube 16Bb Ballpoint pen tip 16Bc Swelling portion 16Bd Swelling portion 16Be Inner surface shape 16S Mechanical pencil unit 161 Core tank 162 Joint member 163 Chuck body 164 Chuck ring 165 Guide member 166 Ejection member 166 168 Core detent member 17 Repellent member 18 Restriction portion 19 Through hole 20 Groove portion 21 Connection member 21b Front portion 21e Plane portion 21f Protrusion 21g Protrusion

Claims (4)

The shaft body has a writing body, a front end is connected to the rear end of the writing body, and a sliding protrusion that is slidable in the direction of the central axis of the shaft body along a sliding groove provided in the shaft body And a slider exposed from the outer peripheral surface of the shaft cylinder, and a writing body protruding from the shaft main body when the slider is advanced, while the writing body is moved when the slider is retracted. In the writing instrument to be immersed in the shaft main body, the sliding groove provided in the shaft main body is formed on a substantially straight line, and the slider restricts movement of the shaft main body in the central axis direction. A writing instrument on which protrusions are formed. The writing instrument according to claim 1, wherein a substantially groove-shaped guide rail is formed on the shaft main body, and a protrusion of the slider enters the guide rail and slides within the guide rail. The shaft body has a writing body, a front end is connected to the rear end of the writing body, and a sliding protrusion that is slidable in the direction of the central axis of the shaft body along a sliding groove provided in the shaft body And a slider exposed from the outer peripheral surface of the shaft cylinder, and a writing body protruding from the shaft main body when the slider is advanced, while the writing body is moved when the slider is retracted. In the writing instrument to be immersed in the shaft body, the slide groove provided in the shaft body is formed in a substantially straight line, and a substantially groove-shaped guide rail is formed on a side surface of the slider, A writing instrument in which an inner surface protrusion that protrudes into the guide rail and slides in the guide rail projects from the shaft body. The writing instrument according to claim 1, wherein the writing body is a mechanical pencil unit.