JP3154090U - Knock-type ballpoint pen - Google Patents

Abstract

A knock type ballpoint pen that can use a refill longer than the conventional one, increases the amount of ink that can be mounted, and increases the writing distance. In a knock type ballpoint pen provided with a first window portion 2b into which a ball portion 5c of a clip 5 can enter and exit and a first protrusion 4b engageable with the first window portion 2b, a pen tip 6a is provided. The refill 6 is held by two protrusions 4 d 1 and 4 d 2 provided on the knock bar 4. By making the projection height of the projection 4d1 on the first projection side lower than the projection height of the projection 4d2, the refill 6 is separated from the first projection 4b side, so that interference between the first projection 4b and the refill 6 is prevented. Can do. [Selection] Figure 2

Description

  The present invention relates to a knock type ballpoint pen in which a writing tip portion appears and more particularly relates to a knock type ballpoint pen in which a refill can be exchanged.

  Conventionally, various configurations have been devised in order to facilitate refill exchange in a knock type ballpoint pen. For example, the invention disclosed in Patent Document 1 is provided on a shaft tube, a first window portion provided on the shaft tube, a first protrusion provided on a knock bar, and detachable from the first window portion, and the shaft tube. A knock-type ballpoint pen is disclosed which is configured by a second window portion and a second protrusion provided on the knock bar and detachable from the second window portion. In this knock-type ballpoint pen, when writing, the first protrusion is engaged with the first window portion by pressing the knock bar that holds the refill against the urging force of the spring. In order to immerse the pen tip after writing, the first protrusion engaging with the first window portion is pressed by the ball portion of the clip. Then, the knock stick moves backward and the pen tip is immersed. In this refill immersion state, the second protrusion engages with the second window portion, and the rearward movement of the knock bar is restricted.

  When the refill is replaced, by pressing the second protrusion, the rearward movement restriction of the knock bar is released (that is, the engagement between the second protrusion and the second window portion is released), and the knock bar and the refill are taken out. Can be exchanged for a replacement refill.

JP 2001-301382 A

  In the above-described knock-type ballpoint pen that allows easy refill replacement, the refill length must be determined on the assumption that the first protrusion provided on the knock bar bends in the centripetal direction of the shaft cylinder. That is, the refill length must be determined so as not to interfere with the refill when the first protrusion is bent. For this reason, the rear end portion of the refill is set to be positioned in front (the pen tip side) of the end portion where the first protrusion is not fixed. Therefore, the length of the refill is limited when it is desired to keep the diameter and the length of the shaft cylinder within an appropriate range (about 10 mm in diameter and about 130 mm in the length of the shaft cylinder). Since the refill length is directly related to the ink amount, the amount of ink that can be mounted is also limited.

  The present invention has a shaft cylinder, a holding means for holding a refill, a knock bar provided in the axial cylinder so as to be slidable in the axial direction, and a biasing means for biasing the knock bar to the rear side. A restricting means for restricting the rearward movement of the knock bar, a maintaining means for maintaining the protruding state of the pen tip by a pressing operation of the knock bar, and maintaining the protruding state of the pen tip by the maintaining means Release means for releasing, and the maintaining means is provided in the first window portion provided in the shaft tube, and provided in the knock bar and elastically bent to the first window portion. A first protrusion formed so as to be capable of being engaged and disengaged, and the holding means is formed by two protrusions provided opposite to each other so that the rear portion of the refill can be held in the rear portion of the knock bar. And one of the two protrusions is the first Together provided the projection side, the projection height of one of said protrusions in said first projection side is, knock-type ballpoint pen which being higher than the other projection height.

  According to the present invention, as the refill holding means, the two protrusions provided opposite to each other are formed in the rear part of the knock bar. These two protrusions are formed such that one protrusion height is higher than the other protrusion height. Further, one of the protrusions having a high protrusion height is formed on the first protrusion side. Then, since the rear end portion of the refill is held by these two protrusions and held, the rear portion of the refill (near the portion held by the two protrusions) is generally lower in the height of the other protrusion. Sent to. The other projection having a low projection height is provided on the side facing the first projection, and as a result, the refill can be held in a direction away from the first projection. Therefore, it can be avoided that the first protrusion and the refill interfere with the bending of the first protrusion during knocking. As a result, even if the refill is lengthened to the rear end of the knock bar, the first protrusion and the refill during the retracting operation can be configured without interference. In other words, since a longer refill than before can be used, the amount of ink that can be mounted increases and the writing distance can also increase.

An example of the whole figure of the knock type ball-point pen concerning the present invention is shown. (A) is a front view of the knock type ballpoint pen concerning the present invention. (B) is a rear view of the knock type ballpoint pen concerning the present invention. The longitudinal cross-sectional view of FIG. 1 is shown. (A) is a longitudinal cross-sectional view which shows the state in which the pen tip is immersed. The state in which the pen tip protrudes in the order of (b) and (c) is shown. It is sectional drawing which shows the (I)-(I) section thru | or (VI)-(VI) section of FIG. It is sectional drawing which shows the (VII)-(VII) cross section of FIG. It is a component drawing of the knock bar of the knock type ballpoint pen concerning the present invention. (A) is a front view of a knock bar part drawing. (B) is sectional drawing which shows the (VIII)-(VIII) cross section thru | or (XI)-(XI) cross section in (a).

  Embodiments of the present invention will be described below with reference to the drawings. In the following description, the forward direction refers to the direction of the pen tip side.

  1 to 5 show a knock type ballpoint pen 1 which is an embodiment according to the present invention. In FIG. 1A, the shaft cylinder 2 of the knock-type ballpoint pen 1 is formed in a substantially columnar shape (see each sectional view in FIG. 3). A front end 2a is formed in a conical shape at the front end. A grip 3 is fitted into a grip portion of the shaft cylinder 2 when writing. On the other hand, a knock bar 4 is provided behind the shaft tube 2 so as to be slidable in the axial direction. Further, the knock bar 4 is urged rearward, and rearward movement is restricted by restriction means described later. And the press part 4a which is a back site | part of the knock stick 4 is comprised so that it may protrude from the axial cylinder 2 rear end.

  A clip 5 is provided at a rear portion of the shaft tube 2. The clip 5 has a leg portion 5 a erected from the rear end portion of the shaft tube 2. The clip main body 5b connected to the leg 5a is formed in a flat plate shape parallel to the shaft cylinder 2 and facing forward. And the ball | bowl part 5c is provided in the surface facing the outer periphery of the axial cylinder 2 of the front-end part vicinity of the clip 5. As shown in FIG. On the other hand, a first window portion 2b described later is provided at a position corresponding to the ball portion 5c of the shaft tube 2.

  Here, the clip main body portion 5b has flexibility and is appropriately set with a material or the like so as to be used for an operation of releasing a pen tip protruding state (writable state) described later.

  In FIG. 1 (b), a second window portion 2c, which will be described later, is provided at a rear portion of one side surface of the shaft tube 2 (that is, the side surface on the back side of the knock-type ballpoint pen 1, which is the opposite side surface in FIG. Is provided. A second protrusion 4c protruding from the knock bar 4 is engaged with the rear end of the second window portion 2c.

  In FIG. 2A, the refill 6 is inserted through the shaft cylinder 2. The refill 6 is the center of a so-called ballpoint pen, and includes a front end portion having a pen tip (ballpoint pen tip) 6a and an ink tank 6b connected to the pen tip 6a. The rear part of the ink tank 6 b is inserted into the knock bar 4.

  The knock bar 4 is a member formed in an elongated shape that is cut out on one side in the longitudinal direction of the hollow member as a whole. A rear portion of the refill 6 (ink tank 6b) is inserted into the knock bar 4. Then, the vicinity of the rear end portion of the refill 6 is held by two protrusions 4d1 and 4d2 provided in the rear portion of the knock bar 4. That is, the holding means for holding the refill 6 is formed by the two protrusions 4d1 and 4d2.

  Further, it is provided between the front end of the knock bar 4 and a step portion 2d formed by providing ribs (not shown) radially extending from the inner peripheral surface of the shaft tube 2 toward the shaft center. A coil spring 7 is provided as a biasing means. Therefore, the knock bar 4 is urged rearward with respect to the shaft tube 2.

  On the other hand, a second protrusion 4c protrudes outward from a position rotated about 90 degrees from the center of the shaft from the clip 5 (ball part 5c) on the knock bar 4 (section (II)-(II) in FIG. 1). FIG. 3 (FIG. 3), (III)-(III) cross-sectional view (FIG. 3), FIG. 1 (VII)-(VII) cross-sectional view (FIG. 4)). Specifically, the leg 4c1 ((III)-(FIG. 1) (FIG. 1) is formed so that the outer surface follows the arcuate cross-sectional shape of the inner surface of the shaft tube 2 from slightly behind the longitudinal center of the knock bar 4. III) The cross-sectional view (FIG. 3) is formed so as to extend rearward. And the 2nd protrusion 4c protrudes outward in the edge part (namely, back end) where the leg part 4c1 is not fixed (refer (VII)-(VII) sectional drawing (FIG. 4) of FIG. 1). However, the height of the protrusion of the second protrusion 4 c does not exceed the outer peripheral surface of the shaft tube 2. This is because protrusions appear on the outer peripheral surface of the shaft cylinder 2 and adversely affect the feeling of use. The second protrusion 4c engages with the rear end 2c1 of the second window 2c. That is, a restricting means for restricting the rearward movement of the knock bar 4 is configured by the engagement between the second protrusion 4c and the rear end 2c1. And the material etc. are set so that the leg part 4c1 may have flexibility.

  On the other hand, from the front end of the knock bar 4, a leg portion 4b1 having a substantially square cross section (see (IV)-(IV) cross section (FIG. 3) and FIG. 2 (a) in FIG. 1) extending rearward is formed. Has been. The leg portion 4b1 is formed at a position rotated about 90 degrees from the leg center 4c1 of the second protrusion. And the 1st processus | protrusion 4b protrudes in the edge part (namely, back end) where the leg part 4b1 is not fixed. The leg portion 4b1 is made of a material and the like so as to have flexibility. In addition, an inclined surface 4b2 is formed at a connecting portion between the leg portion 4b1 and the first protrusion 4b so as to be guided along an inclined surface 2e1 described later. The first protrusion 4b is guided by a guide groove 2e (see (I)-(I) cross-sectional views (FIG. 3) and FIG. 2 in FIG. 1) formed in the inner circumference of the shaft tube 2 by a predetermined length in the longitudinal direction. ing. Further, the first protrusion 4 b is provided so as to face the ball portion 5 c of the clip 5. On the other hand, the 1st window part 2b opened to the axial cylinder 2 outer peripheral surface is provided facing the ball part 5c, and is connected with the guide groove 2e via the inclined surface 2e1 and the flat part 2e2.

  In the operation of the knock type ballpoint pen 1, when the pen tip 6 a is immersed (FIG. 2A), the knock bar 4 holding the refill 6 is urged rearward by the coil spring 7 and is a restricting means. Backward movement is restricted by the engagement of the two protrusions 4c and the second window portion 2c. Therefore, the immersion state of the pen tip 6a is maintained. At this time, when the pressing portion 4a at the rear end of the knock bar 4 is pressed forward with a finger or the like, the first protrusion 4b is guided from the guide groove 2e to the inclined surface 2e1 and the flat portion 2e2 (FIG. 2B). The first window portion 2b is engaged. Specifically, the rearward movement of the knock bar 4 by the rearward biasing force of the coil spring 7 is restricted by the engagement between the rear end surface of the first protrusion 4b and the rear end wall of the first window portion 2b. Is. At this time, since the nib 6a protrudes from the tip of the nib 2a and the rearward movement of the knock bar 4 holding the nib 6a (that is, the refill 6) is restricted, the knock-type ballpoint pen 1 is in a writable state. It becomes. That is, the maintaining means for maintaining the protruding state of the pen tip 6a is constituted by the first protrusion 4b and the first window portion 2b.

  In order to immerse the nib 6a after writing, if the clip 5 (clip body portion 5b) is pressed toward the shaft cylinder 2, the first protrusion 4b is pressed toward the shaft center by the ball portion 5c, The engagement between the first protrusion 4b and the first window portion 2b is released. Then, coupled with the urging force to the rear of the coil spring 7, the first protrusion 4b is guided from the flat portion 2e2 to the guide groove 2e via the inclined surface 2e1. Then, the knock bar 4 moves rearward until the second protrusion 4c and the second window portion 4c are engaged (until the rearward movement of the knock bar 4 is restricted). When the knock bar 4 moves rearward, the pen tip 6a is also immersed together with the knock bar 4, and the pen tip 6a is immersed (FIG. 2 (a)).

  In this way, the ball portion 5c, the first window portion 2b, and the first protrusion 4b of the clip 5 are configured as release means for releasing the protruding state of the pen tip 6a.

  When replacing the refill 6 by consuming all the ink in the ink tank 6b, the second protrusion 4c is pressed in the axial center direction. Then, the engagement between the second protrusion 4c and the second window portion 2c is released, and the knock bar 4 is not restricted from moving backward, so that the first protrusion 4b is guided to the guide groove 2e and the refill 6 is held. The knock bar 4 can be extracted from the shaft tube 2. Thereafter, the refill 6 can be extracted from the knock bar 4 and replaced with a replacement refill.

  In this manner, the knock ballpoint pen 1 is configured to facilitate refill exchange.

  Here, the protrusions 4d1 and 4d2 which are holding means for the refill 6 according to the present invention will be described in detail. The refill 6 is inserted until its rear end comes into contact with a step 4e formed on the inner surface near the rear end of the knock bar 4. That is, the refill 6 is inserted directly under the first protrusion 4b. In this case, there is a possibility that the rear end portion of the leg 4b1 and the refill 6 interfere with each other due to the bending of the leg 4b1 at the time of knocking. Therefore, the refill 6 must be configured to reliably separate from the leg 4b1, particularly the rear end portion of the leg 4b1 (more specifically, the outer peripheral surface of the refill 6 facing the first protrusion 4b). This is because it has an adverse effect when the pen tip 6a moves in and out. Therefore, the protrusions 4d1 and 4d2 according to the present invention were formed. That is, the protrusion 4d1 was formed on the first protrusion 4b side, and the protrusion 4d2 was formed facing the protrusion 4d1. Here, the height of the protrusion 4d1 was formed higher than the height of the protrusion 4d2. The refill 6 is held by the knock bar 4 by holding the rear part by the two protrusions 4d1 and 4d2. Therefore, the refill 6 is held in a state in which the refill 6 is brought close to the protrusion 4d2 side having a low protrusion height. That is, the refill 6 held between the protrusions 4d1 and 4d2 having different protrusion heights is securely held in a direction away from the first protrusion 4b. Therefore, it is possible to reliably avoid interference between the leg 4b1 (first protrusion 4b) and the refill 6 when knocking.

  Further, guide portions 4f formed in a U-shaped cross section are provided at a plurality of locations on the knock bar 4 ((VIII)-(VIII) cross-sectional view of FIG. 5A, (IX)-(IX) cross-section). Drawing, (X)-(X) sectional drawing, (XI)-(XI) sectional drawing, (refer FIG.5 (b)). The guide part 4f sets the center position of the refill to be inserted so as to guide the refill 6 in a direction away from the first protrusion 4b. Therefore, in combination with the two protrusions 4d1 and 4d2, interference between the leg 4b1 (first protrusion 4b) and the refill 6 can be avoided more reliably.

  In addition, when each knock section 4 is formed as a resin molded product by an injection molding machine by forming each section of the guide portion 4f in a U-shape, a so-called parting line is formed in each longitudinal section direction (see FIG. 5B). An injection mold can be configured as a PL line shown in cross section. Therefore, since there is no need for a configuration such as an undercut, the molding accuracy is not adversely affected. In particular, since the protrusions 4d1 and 4d2 can be provided linearly in the cross-sectional direction of the knock bar 4 (see (VIII)-(VIII) cross-sectional view in FIG. 5A (see FIG. 5B)), The knock bar 4 can be molded by injection molding with higher accuracy than when provided in an annular shape.

  By the way, the knock bar 4 according to the present invention is provided with the guide portion 4f having a U-shaped cross section as described above, so that the cross section of the pressing portion 4a which is a portion exposed from the shaft tube 2 is also U-shaped. (See (VIII)-(VIII) cross-sectional view of FIG. 5A) (see FIG. 5B)). Therefore, in the pressing part 4a exposed from the shaft tube 2, the vicinity of the rear end part of the refill 6 in the pressing part 4a is exposed on the outer surface. In this case, if foreign matter or the like is mixed into the refill 6 (ink tank 6b) from the exposed portion, it causes a problem. In addition, the appearance is poor. Therefore, the cover 8 is provided so as to cover the exposed portion.

  That is, among the pressing portions 4a that are the rear portions of the knock bar 4 formed in a U-shaped cross section, the finger contact portion 4a1 that presses the finger or the like at the rear end is formed on a spherical surface. This is to improve the finger pressing sensation. Then, an arcuate protrusion 4a2 was formed on the outer periphery of the pressing portion 4a continuously with the finger contact portion 4a1 formed in a spherical shape. The arc-shaped protrusion 4a2 has a shape obtained by cutting a predetermined position from the center of the fan-shaped cross section, and the outer periphery is formed in an arc shape having a predetermined length. And in the longitudinal direction, while being connected with the finger pad part 4a1, it forms along the outer periphery of the press part 4a.

  On the other hand, the cover 8 is formed to extend in the longitudinal direction in the shape of a C-shaped cross section. And the cover 8 is attached so that the edge part (part formed in linear form) at the time of seeing from the cross section of the circular-arc-shaped protrusion 4a2 may be pinched in the part which the cover 8 is opening. The outer periphery of the cover 8 attached in this manner is formed so as to be continuously connected to the arc of the arc-shaped protrusion 4a2. The longitudinal direction of the cover 8 is formed so as to be fitted to the concave portion of the pressing portion 4a formed in a U-shaped cross section. Therefore, the cover 8 can be configured to prevent the entry of foreign matter and the like while accurately finishing the knock bar 4 by injection molding. In addition, the design can be accented by coloring the cover 8 or using a plated part such as metal.

  As mentioned above, although the Example of this invention was described in detail, this invention is not limited to this, It can change suitably in the range which does not change the summary of this invention.

DESCRIPTION OF SYMBOLS 1 Knock-type ball-point pen 2 Shaft cylinder 2a Front port 2b 1st window part 2c 2nd window part 2d Step part 2e Guide groove 2e1 Inclined surface 2e2 Flat part 3 Grip 4 Knock stick 4a Press part 4a1 Finger-contact part 4a2 Arc-shaped protrusion 4b 1st One protrusion 4b1 Leg part 4c Second protrusion 4b1 Leg part 4d1, 4d2 Projection 4e Step part 4f Guide part 5 Clip 5a Leg part 5b Clip body part 5c Ball part 6 Refill 6a Pen tip (ball-point pen tip)
6b Ink tank 7 Coil spring 8 Cover

Claims (4)

A barrel,
A knock bar having holding means for holding a refill and provided so as to be slidable in the axial direction in the shaft cylinder;
Urging means for urging the knock bar to the rear side;
Restriction means for restricting movement of the knock bar to the rear side;
Maintaining means for maintaining the protruding state of the nib by the pressing operation of the knock bar;
Releasing means for releasing maintenance of the protruding state of the pen tip by the maintaining means,
The maintaining means includes a first window provided on the shaft tube, a first protrusion provided on the knock bar and formed to be detachable from the first window by being elastically bent. Formed by,
The holding means includes two protrusions provided facing each other in the rear portion of the knock bar so as to sandwich the rear portion of the refill, and one of the two protrusions is on the first protrusion side. A knock type ballpoint pen that is provided and has a protrusion height of one of the protrusions on the first protrusion side higher than that of the other protrusion. The two protrusions provided opposite to each other in the rear part of the knock bar are formed linearly and continuously in the axial direction, and one end of the protrusion is opened and the other end is closed. The knock type ballpoint pen according to claim 2 characterized by things. The knock bar is provided with a refill guide portion formed in a U-shaped cross section with respect to the axial direction, and the refill guide portion is formed to guide the refill in a direction away from the first protrusion. The knock type ballpoint pen according to claim 1 or 2 characterized by things. The restricting means includes a second window portion provided on the shaft tube, and a second protrusion provided on the knock bar and elastically bent so as to be detachable from the second window portion. Formed,
The knock type ballpoint pen according to any one of claims 1 to 3, wherein the release means is formed by a ball part formed so as to be able to enter and exit from the first window part.

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