JP5320259B2 - Knock-type writing instrument - Google Patents

Description

  The present invention relates to a knock-type writing instrument in which a writing tip is moved up and down by a knock operation, and more particularly to a knock-type writing tool in which a writing tip can be stored in a shaft cylinder even when a clip is operated.

  As a knock type writing instrument, a writing instrument in which a refill (writing body) protrudes to a writing position or retracts to a storing position by a knocking operation via a cam mechanism that converts linear motion into rotational motion is widely known. A writing instrument is also known in which the refill is usually advanced or retracted by a knock operation, but the refill can be moved backward by operating a clip without using the knock operation (for example, Patent Document 1). reference). In such a writing instrument, for example, the writing instrument described in Patent Document 1, a so-called heart-shaped cam groove is provided on the outer peripheral surface of the knock member protruding from the tail end opening of the shaft cylinder, and a clip presser is formed in the cam groove. The locking projection is fitted. The cam groove is composed of a substantially heart-shaped ascending path and descending path, and a linear up-and-down moving path that extends downward from the intersection between the ascending path and the descending path, and a concave portion at the intersection of the ascending path and the descending path. Is a locking portion (Patent Document 1, paragraph 0009, FIG. 2). When the knock member is knocked, the locking projection moves relatively along the ascending path and the descending path of the cam groove so that the refill can be projected and retracted. When the tip of the clip is lifted, the locking projection is The knock member is released from the locking portion of the cam groove, and the refill can be immersed. In this way, the locking protrusion and the knock member move relative to each other as shown in FIG. 2 of Patent Document 1, but actually, the clip has a proximal end so that the presser is pressed against the outer surface of the shaft tube. Since it is fixed to the shaft cylinder, the knock member moves back and forth and rotates in the circumferential direction.

  In the writing instrument configured as described above, if the locking projection is strongly pressed against the cam groove by the spring pressure of the clip, it becomes the rotational resistance of the knock member, and when the knock member is operated, it does not operate smoothly and the operation is not performed. It becomes difficult to do. On the other hand, if it is configured so that the locking protrusions are lightly in contact with the cam groove so that the knock member can rotate freely, the locking protrusion can be easily detached from the cam groove during operation, or the clip can be lifted up. When the knock member moves backward, the knock member may rotate freely, the cam groove may come off from the position opposite to the locking protrusion, and the locking protrusion may ride on the outer peripheral surface of the knock member. If such a situation occurs, the locking projection will press the movement of the knock member, so that the rotational movement and forward / backward movement of the knock member will be hindered, and there will be no guidance by the cam groove. However, you can no longer invade the refill.

JP 2002-240487 A (Claims, paragraph 0009, FIGS. 1 and 2)

  The problem to be solved by the present invention is that in a knock-type writing instrument that allows the refill to be retracted when the clip is lifted up and down by knocking operation, the knocking operation can be lightened, and a stopper (locking protrusion) provided on the clip is provided. It is an object of the present invention to provide a knock type writing instrument which can be operated smoothly even if it is disengaged from the cam groove.

  According to the present invention, in the writing instrument in which the refill is housed in the shaft cylinder and the knock member urged toward the rear of the shaft cylinder is moved back and forth so that the tip of the refill protrudes and retracts from the tip of the shaft cylinder. A stopper is formed on the inner surface of the clip provided on the shaft cylinder, and a cam cylinder having a cam groove formed on the outer periphery so that the tip of the stopper can enter is rotatably provided on the outer periphery of the knock member. The forward groove through which the tip of the stopper passes, the receiving groove to which the tip of the stopper engages when the tip of the refill protrudes to the writing position, the backward groove through which the stopper passes when the knock member moves backward, and the tip of the refill There is a storage groove part into which the tip of the stopper enters when the knock member retracts to the position where it is stored in the cylinder, and the tip of the stopper advances in the circumferential direction of the storage groove part. Parts, it is provided a knock-type writing instrument, wherein the retaining grooves penetrate the tip of the stopper when the receiving groove portion and the knock member disengaged from the receding groove is retracted is formed, the problems are solved.

  According to the present invention, the stopper is provided between the presser formed at the tip of the clip and the base end of the clip, and a space is formed between the tip of the stopper and the bottom of the cam groove. Is provided with the knock type writing instrument in which an inclined surface for guiding the tip of the stopper toward the storage groove is formed.

  In the present invention, one of the knock member and the cam cylinder is formed with a rotation control groove extending in the circumferential direction and having locking edges at both ends in the circumferential direction, and the rotation control is formed in the other member. The knock type writing instrument provided with a guide projection that protrudes into the groove and can come into contact with the locking edge is provided. The knock member preferably includes a knock projecting from the rear end of the shaft tube and a pusher connected to the knock, and the cam tube is loosely fitted on the outer periphery of the pusher.

  In the present invention, a stopper is formed on the inner surface of the clip, and a cam cylinder having a cam groove formed on the outer periphery so that the tip of the stopper enters is rotatably provided on the outer periphery of the knock member, and the cam groove advances the knock member. When the tip of the stopper passes through, the receiving groove where the tip of the stopper engages when the tip of the refill protrudes to the writing position, the recess groove through which the stopper passes when the knock member moves backward, and the tip of the refill There is a storage groove part into which the tip of the stopper enters when the knock member is retracted to the position where it is stored in the stopper. The tip of the stopper is separated from the advance groove part, the receiving groove part and the reverse groove part in the circumferential direction of the storage groove part, and the knock member is retracted. As a result, a retaining groove was formed to allow the tip of the stopper to enter. It is Rukoto, the tip of the stopper if lifted clips when there is refill the writing position can be accommodated the tip of the refill to retract the knock member disengaged from the cam groove in the barrel. Even if the stopper is removed from the cam groove during the operation and the knock member is retracted, the tip of the stopper does not ride on the outer periphery of the knock member, and the holding groove formed in the circumferential direction of the storage groove Get in. Therefore, if the knocking operation is performed, the stopper corresponds to the receiving groove portion from the advance groove portion through the storage groove portion, and therefore, the refill can be used in the normal manner.

  In addition, if the stopper is provided between the presser formed at the tip of the clip and the base end of the clip so that a space is formed between the tip of the stopper and the bottom of the cam groove, the rotation of the cam cylinder causes the spring pressure of the clip. In addition, the cam cylinder can be smoothly rotated without being restrained by the stopper, and in addition, when the inclined surface for guiding the tip of the stopper toward the storage groove is formed in the holding groove, a knock is formed on the tip of the stopper. By the operation, the forward groove portion can easily correspond to the storage groove portion, and the cam cylinder can be operated extremely smoothly.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows an embodiment of the present invention, (A) is a cross-sectional view of a state where the tip of a refill is immersed in a shaft cylinder, and (B) is an explanatory view of a stopper and a cam groove. Sectional drawing of a clip holder. A pusher is shown, (A) is a bottom view, (B) is a sectional view, and (C) is a partial plan view. A knock is shown, (A) is a top view, (B) is a front view, (C) is a cross-sectional view. The cam cylinder is shown, (A) is a plan view, (B) is a bottom view, (C) is an explanatory view of the pusher and the cam cylinder in a state where the tip of the refill is housed in the shaft cylinder, (D) and (E) FIG. 6 is an explanatory view of a state where the cam cylinder is rotated clockwise and counterclockwise. The side view of the state which pressed the clip. The state when knocking is performed in the state shown in FIG. 1 is shown, (A) is a sectional view, and (B) is an explanatory view of a stopper and a cam groove. The state when knocking operation is stopped from the state of FIG. 6 is shown, (A) is a sectional view, (B) is an explanatory view of a stopper and a cam groove. The state when knocking is performed from the state shown in FIG. 7 is shown, (A) is a cross-sectional view, and (B) is an explanatory view of a stopper and a cam groove. The state which lifted the clip in the state shown in FIG. 7 is shown, (A) is sectional drawing, (B) is explanatory drawing of a stopper and a cam groove. The expanded view which shows the relationship between a cam groove and a stopper.

  FIG. 1 shows an embodiment of a writing instrument according to the present invention. A shaft cylinder 1 is provided with a taper 4 having a tip hole 3 for projecting and retracting a refill 2 at the tip, and a refill holder 5 for holding the refill 2 is provided inside. The refill holder 5 is urged rearward by a refill spring 6.

  A clip 7 is provided at the rear of the shaft tube. Although the clip can be variously configured, in the embodiment shown in FIG. 1, the pusher 8 is provided at the distal end and the proximal end is pivotally attached to the pivot 15 provided on the clip holder 9. The clip holder 9 is fixed by inserting and securing an attachment structure portion such as a locking claw in an attachment hole provided at the rear portion of the shaft cylinder, and the presser 8 is fixed to the shaft cylinder 1 by a substantially S-shaped clip spring 10. The pressing element 8 is rotated in a direction away from the shaft cylinder 1 by pressing the pressing portion 11 formed at the rear end. A stopper 12 protrudes from the inner surface of the clip 7 between the presser 8 and the base end, and the tip of the stopper 12 enters the shaft tube 1 through an insertion hole 13 formed in the shaft tube. In addition, the contact piece 14 extended ahead is formed in the front-end | tip of the said clip holder 9 which exists in a shaft cylinder (refer FIG. 2). The contact piece 14 is located on the side of the insertion hole 13 in the circumferential direction so as not to block the insertion hole 13.

  A knock member 16 for moving the refill 1 forward (in the taper 4 direction) is provided behind the refill holder 5. The knock member 16 may be constituted by one substantially rod-shaped member connected to the refill holder. However, in the embodiment shown in the figure, a knock 17 projecting from the rear end of the shaft cylinder 1 and the knock 17 A pusher 18 to be connected is provided. The pusher 18 is inserted into a pusher holder 19 fixed in the shaft cylinder so as to be movable back and forth in the longitudinal direction. A tip piece 20 is provided at the tip of the pusher, and the tip piece 20 is inserted into the receiving plate 21 in a state of being positioned in front of the receiving plate 21 formed integrally with the refill holder 5. The pusher 18 is urged rearward by a pusher spring 23 mounted between the pusher holder 19 and the flange 22 formed on the pusher 18. The connection between the receiving plate 21 and the pusher 18 is such that when the pusher 18 moves forward, the tip piece 20 of the pusher hits the rear end of the refill holder 5 so that the refill 2 can be moved forward through the refill holder 5. When the pusher 18 moves backward, the tip 20 of the pusher contacts the receiving plate 21 and moves so that the refill holder 5 and the refill 2 can be moved backward by the action of the refill spring 6 and the pusher spring 23. It is connected as possible. The tip of the pusher and the refill holder may be connected in an immobile state, or the refill may be directly connected to the pusher.

  The pusher 18 is formed in a cylindrical shape having a through hole 24 as shown in FIG. 3, and a rib 25 is provided on the outer periphery between the front end and the flange 22, and on the rear end side behind the flange. A plurality of locking projections 26 that are inclined toward each other are formed, and a long groove 27 is provided between the locking projections 26 to allow the pusher to bend in the radial direction. Further, on the outer periphery, there are provided a small ridge 28 and a rotation control groove 30 which extends in the circumferential direction and has locking edges 29 at both ends in the circumferential direction.

  As shown in FIG. 4, the knock 17 connected to the pusher 18 is formed in a cylindrical body having an end plate 31 at one end. In addition, there is a shaft portion 22 inserted into the through hole 24 from the rear end of the pusher 18, and an inscribed tube portion 33 that is substantially inscribed in the shaft tube 1 from the end plate 31 toward the front is formed. The inscribed cylinder portion 33 is formed with an attachment structure portion such as a locking claw of the clip holder 9 and an opening portion 34 into which the stopper 12 enters. The knock 17 can be advanced by a knock operation to a position where the end plate 31 contacts the rear end of the pusher, and further pushes the pusher 18 against the pusher spring 23 and the refill spring 6. be able to. When the knocking operation is stopped, the knock 17 is retracted to a position where the front edge of the opening 34 abuts against the contact portion 14 of the clip holder 9 by a knock spring 35 provided between the shaft portion 32 and the inner step portion of the pusher 18. To do.

  In the embodiment shown in the figure, the knock member 16 is rotatably mounted on the outer periphery of the pusher 18. As shown in FIG. 5, the cam cylinder 36 is inserted to a position where it contacts the flange 22 beyond the locking projection 26 while bending the rear end of the pusher 18 in the radial direction. 26 to prevent it from coming off. A cam groove 37 is formed on the outer periphery of the cam cylinder 36 so that the tip of the stopper 12 enters. As shown in FIG. 5A, the cam groove 37 has an advancing groove portion 38 through which the tip of the stopper 12 passes when the knock member advances, and a tip of the stopper 12 when the tip of the refill 2 protrudes to the writing position. The receiving groove 39 to be mated, the retreat groove 40 through which the stopper 12 passes when the knock member retreats, and the storage groove 41 into which the tip of the stopper 12 enters when the knock member is retracted to the position where the tip of the refill is housed in the shaft cylinder. The receiving groove portion 39 is formed with a locking wall 42 and two inclined walls 43 and 44, and the whole is formed in a substantially heart shape. Then, following the storage groove portion 41, the holding groove portion 45 receives the front end of the stopper 12 when the tip of the stopper is detached from the forward groove portion 38, the receiving groove portion 39 and the backward groove portion 40 and the knock member is retracted. It is formed in the circumferential direction. The circumferential width b of the holding groove 45 is at least equal to or greater than the distance (width) from the cam groove wall 38a forming the advance groove 38 to the cam groove wall 40a forming the retreat groove 40. And an inclined surface (inclined wall) 46 for guiding the tip of the stopper 12 toward the storage groove 41 is provided.

  Between the cam cylinder 36 and the knock member 16, it is preferable to provide a rotation restricting means for restricting the rotation range of the cam cylinder so that the cam cylinder rotates within the range of the forward groove portion, the receiving groove portion and the backward groove portion. Such rotation restricting means can be appropriately configured, but in the embodiment shown in the figure, the rotation restricting means is constituted by the rotation control groove and the guide projection. That is, a rotation control groove 30 that extends in the circumferential direction and has locking edges 29 at both ends in the circumferential direction as described above is formed in one of the knock member and the cam cylinder, in the figure, the pusher 18. Yes. As shown in FIG. 5B, the other member, the cam cylinder 36 in the figure, is partially cut out in a substantially U-shape and a long piece of guide piece 47 is formed, and the rotation control is formed at the tip thereof. A guide protrusion 48 that protrudes into the groove 30 and can come into contact with the locking edge 29 is provided. With this configuration, the rotation range of the cam cylinder is restricted as shown in FIGS. 5 (C), (D), and (E). Contrary to the illustrated embodiment, a guide projection may be provided on the pusher 18 side to form a rotation control groove in the cam cylinder 36.

  The tip of the stopper 12 only needs to engage with the wall forming the cam groove 37 and enter the cam groove long enough to withstand the writing pressure. At this time, the tip of the stopper is preferably long enough to form a minute space between the bottom of the cam groove 37 and the bottom of the cam groove 37 as shown in the drawing. Such a space can be easily secured by bringing the pressing member 8 of the clip into contact with the outer surface of the shaft tube 1. If comprised in this way, rotation of the said cam cylinder will not be prevented by the elastic action of a clip, and a refill can be made to appear smoothly by knocking operation.

  With the above configuration, as shown in FIG. 1, the knock member 16, in the embodiment, the knock 17 and the pusher 18 are moved to the springs 6, 23, and 35 by a knock operation from a state where the refill is immersed in the shaft cylinder. As the cam cylinder advances, the cam cylinder advances while rotating, and the advance groove 38 from the storage groove 41 corresponds to the tip of the stopper 12, and the receiving groove 39 advances to a position corresponding to the tip of the stopper 12. The inclined wall 43 hits the tip of the stopper 12 and the writing tip of the refill 2 protrudes from the taper 4 of the shaft cylinder (FIG. 6). When the knocking operation is stopped, the knock 17 is retracted by the knock spring 35, and the pusher 18 is slightly retracted by the action of the refill spring 6 and the pusher spring 23. Therefore, the tip of the stopper 12 is engaged with the locking wall 42 of the receiving groove 39. The refill 2 is held in the protruding position and can be written (FIG. 7). When the knock 17 is pressed from this state, the cam groove corresponds to the stopper 12 via the inclined wall 44 (FIG. 8). Therefore, when the knock operation is stopped, the knock 17 is moved backward by the action of the knock spring 35. Since the pusher spring 23 and the refill spring 6 are also moved back by the action of the pusher spring 23 and the refill spring 6, as shown in FIG. 1, the tip of the refill 2 is immersed in the shaft cylinder, and the storage groove enters the tip of the stopper. .

  As shown in FIG. 9, when the tip of the stopper 12 is engaged with the locking wall 42 of the receiving groove 39 as described above and the tip of the refill protrudes from the shaft tube, the pressing portion 11 of the clip 7 is When the tip of the clip is lifted by pushing, the tip of the stopper 12 is disengaged from the cam groove 37, so that the knock member 16 is retracted by the action of the refill spring 6 and the pusher spring 23, and when the pressing of the pressing portion is stopped, the stopper is moved into the storage groove. The refill holder 5 is also retracted, and the tip of the refill 2 is immersed in the shaft tube.

  As shown in FIG. 10, even if the cam cylinder and the stopper are moved away from the tip of the stopper and the cam cylinder (knock member) is retracted at any corresponding position, the cam cylinder and the stopper move in the circumferential direction of the storage groove portion 41. Since the holding groove 45 is formed, when the knock member returns to the retracted position, the holding groove 45 surely corresponds to the tip of the stopper 12, and the tip of the stopper 12 enters the holding groove 45. Therefore, if the knock member is knocked next, the advance groove 38 corresponds to the tip of the stopper 12 through the storage groove 41, and the refill can be made to appear and disappear as described above.

1 shaft cylinder 2 refill 7 clip 12 stopper 16 knock member 17 knock 18 pusher 36 cam cylinder 37 cam groove 38 forward groove part 39 receiving groove part 40 backward groove part 41 storage groove part 45 holding groove part

Claims (5)

  A clip provided on the shaft cylinder in a writing instrument in which the refill is housed in the shaft cylinder and the knock member urged toward the rear of the shaft cylinder is moved back and forth so that the tip of the refill protrudes and retracts from the tip of the shaft cylinder. A stopper is formed on the inner surface of the cam cylinder, and a cam cylinder having a cam groove formed on the outer periphery so that the tip of the stopper can enter is rotatably provided on the outer periphery of the knock member. A forward groove that passes through, a receiving groove that engages the tip of the stopper when the tip of the refill protrudes to the writing position, a retractable groove that passes through the stopper when the knock member moves backward, and the tip of the refill is stored in the shaft cylinder. And a stopper groove into which the tip of the stopper enters when the knock member is retracted to a position, and the tip of the stopper extends in the circumferential direction of the stopper groove, Knock-type writing instrument knocking member off the withdrawal groove, characterized in that the retaining grooves tip of the stopper enters is formed when retracted.   The knocking type writing instrument according to claim 1, wherein the stopper is provided between a presser formed at the tip of the clip and a base end of the clip, and a space is formed between the tip of the stopper and the bottom of the cam groove.   The knock type writing instrument according to claim 1 or 2, wherein the holding groove portion is formed with an inclined surface for guiding a tip of a stopper toward the storage groove portion.   One of the knock member and the cam cylinder is formed with a rotation control groove extending in the circumferential direction and having locking edges at both ends in the circumferential direction, and the other member projects into the rotation control groove and protrudes from the engagement member. The knock type writing instrument according to any one of claims 1 to 3, wherein a guide projection capable of contacting the stop edge is provided.   5. The knock according to claim 1, wherein the knock member includes a knock projecting from a rear end of the shaft cylinder and a pusher connected to the knock, and the cam cylinder is loosely fitted on an outer periphery of the pusher. Formula writing instrument.

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