JP3960847B2 - Knock-type writing instrument - Google Patents

Knock-type writing instrument Download PDF

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Publication number
JP3960847B2
JP3960847B2 JP2002113095A JP2002113095A JP3960847B2 JP 3960847 B2 JP3960847 B2 JP 3960847B2 JP 2002113095 A JP2002113095 A JP 2002113095A JP 2002113095 A JP2002113095 A JP 2002113095A JP 3960847 B2 JP3960847 B2 JP 3960847B2
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JP
Japan
Prior art keywords
cam
knock
fixed
locking
rotating
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
JP2002113095A
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Japanese (ja)
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JP2003305990A (en
Inventor
清隆 芳野
Original Assignee
株式会社パイロットコーポレーション
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 株式会社パイロットコーポレーション filed Critical 株式会社パイロットコーポレーション
Priority to JP2002113095A priority Critical patent/JP3960847B2/en
Publication of JP2003305990A publication Critical patent/JP2003305990A/en
Application granted granted Critical
Publication of JP3960847B2 publication Critical patent/JP3960847B2/en
Expired - Fee Related legal-status Critical Current
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Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a knock-type writing instrument having a feeding mechanism that includes a cam groove, a rotating cam, a fixed cam, and a knock body, and protrudes and retracts a writing tip portion of a writing body from a tip opening portion of a shaft cylinder.
[0002]
[Prior art]
Conventionally, for example, a knock body having a chevron-shaped uneven portion at the tip and a fixed cam having a plurality of protrusions on the outer peripheral surface, and a meshing portion that meshes with the uneven portion, and a plurality of cam protrusions around the outer peripheral surface. The writing tip of the writing body which is made up of a rotating cam having a shape and a cam groove formed on the inner wall surface of the shaft cylinder, and the rotating cam advances, rotates, and retreats by pressing the knock body, and contacts the rotating cam A knock type writing instrument having a feeding mechanism in which a portion protrudes and retracts from a tip opening of a shaft cylinder is known. The structure of the conventional knock-type writing instrument will be described with reference to the drawings. The conventional knock-type writing instrument 51 shown in FIGS. 10 and 11 has a cam groove extending along the axial direction on the inner wall surface of the shaft cylinder 2. 3 is formed. Although not shown, a knock type in which a clip having a cylindrical leg portion attached to the rear end portion of the shaft tube and an inner tube portion inserted into the rear end portion of the shaft tube is attached to the rear end portion of the shaft tube. Some writing instruments have cam grooves formed on the inner wall surface of the inner cylindrical portion of the clip. Since the basic actions of the respective members are the same, the description will be made as a structure in which the cam groove 3 is formed on the inner wall surface of the shaft cylinder 2 as shown in FIG.
[0003]
As shown in FIG. 6, the knock body 4 is fixed with a fixed cam 7 having a mountain-shaped uneven portion 5 at the tip and a plurality of protrusions 6 engaging the cam groove 3 on the outer peripheral surface. It is. The protrusion 6 of the fixed cam 7 is formed so as to be positioned on the line (on the alternate long and short dash line) of the top 5a of the mountain-shaped uneven portion 5. As shown in FIG. 7, the rotating cam 9 is provided with a plurality of cam projections 11 that engage with the cam grooves 3 on the outer circumferential surface thereof, and the rear end (upper end portion in the figure) of the cam projection 11 is the uneven portion. The meshing portion 10 is configured by an inclined surface 10 a meshing with the portion 5. When the protrusion 6 of the fixed cam 7 and the cam protrusion 11 of the rotating cam 9 are engaged with the cam groove 3, the top 5 a of the concavo-convex portion 5 is in contact with the middle position of the inclined surface 10 a of the meshing portion 10. is there. As shown in FIGS. 4 and 5, in the cam groove 3, a cam groove 3-1 having a deep axial diameter and a shallow cam groove 3-2 are alternately formed on the inner wall surface of the shaft cylinder 2. . The tip end of the projecting piece 14 extending in the direction along the axis constituting the cam groove 3 is formed on the inclined wall surface 15. The shallow cam groove 3-2 is configured such that the cam protrusion 11 abuts against the bottom 16 of the cam groove 3-2 so that the cam protrusion 11 of the rotating cam 9 cannot engage and slide. The tip of the bottom 16 is also an inclined surface as shown in FIG. With such a structure, the tip of the shallow cam groove 3-2 is a locking portion 17 that can lock the inclined surface 10a of the cam projection 11.
[0004]
Although not shown, a writing body, for example, a ballpoint pen refill is urged toward the knock body 4 side by a coil spring on the front end or inner wall surface of the rotary cam 9 and a rear end portion thereof is in contact with it.
[0005]
Next, the operation will be described. FIG. 9 is a conceptual diagram showing the positional relationship between the concave and convex portion 5 of the fixed cam 7, the meshing portion 10 of the rotating cam 9, and the cam protrusion 11 in the cam grooves 3-1 and 3-2. Then, by pressing the knock body 4 toward the distal end of the shaft cylinder 2, the fixed cam 7 is guided to the protrusion 6 engaged with the deep cam groove 3-1 and the shallow cam groove 3-2 in conjunction with the knock body 4. Accordingly, the rotating cam 9 connected to the fixed cam 7 is guided and advanced by the cam protrusions 11a and 11b engaged with the deep cam groove 3-1. When the cam protrusions 11 a and 11 b reach the tip of the deep cam groove 3-1 and are separated from the cam groove 3-1, the top 5 a of the uneven portion 5 of the fixed cam 7 is in the middle of the inclined surface 10 a of the meshing portion 10 of the rotating cam 9. The rotating cam 9 is rotated from right to left in an attempt to move backward (see FIG. 5) because it receives the rear end portion of the cursive body biased backward by a coil spring (not shown). , Because the inclined surface 10a of the meshing portion 10 is lowered to the right). Accordingly, as shown in the figure below, the rear end (engagement portion 10) of the cam projection 11b of the rotating cam 9 slides against the inclined wall surface 15 at the tip of the projecting piece 14 forming the cam groove 3, and the shallow cam groove 3-2, the rear end of the cam projection 11b abuts against the bottom 16 of the cam groove 3-2 and engages the inclined surface 10a of the cam projection 11 without engaging the cam groove 3-2. Lock to the stop 17. As a result, the rotating cam 9 and the writing body cannot be further retracted, and the writing front end portion of the writing body is maintained in a state of protruding from the front end opening (not shown) of the shaft tube 2.
[0006]
At this time, the rotating cam 9 does not rattle in the shaft cylinder 2 because the cam projection 11 is locked to the locking portion 17 of the cam groove 3 while receiving the urging force to the rear of the refill. 4 and the fixed cam 7 can slide between the rear end surface of the rotating cam 9 and the original position (a state in which the protrusion 6 of the fixed cam 7 is in contact with the rear end 3a of the cam groove 3). End up. Therefore, conventionally, the coil spring 20 is disposed between the rotary cam 9 and the fixed cam 7 so that the knock body 4 and the fixed cam 7 are forcibly returned to their original positions by the urging force of the coil spring 20. Some of them are
[0007]
However, in the structure as described above, since it cannot be determined from the state (length) of the knock body whether or not the writing tip of the writing body is exposed from the tip opening of the shaft tube, FIG. 10 and FIG. As shown in the figure, a rod-like protrusion 13 to be inserted into the fixed cam 7 is formed at the rear end of the rotating cam 9, and a locking projection 18 is provided on the outer peripheral surface of the rod-like protrusion 13. A locking step portion 19 that can contact the locking projection 18 is formed, and the locking step portion 19 comes into contact with the locking projection 18 while the knock body 4 returns to its original position, so that the knock body 4 Some have a structure that does not return to the original position.
[0008]
[Problems to be solved by the invention]
Conventionally, in a knock type writing instrument having a feeding mechanism composed of a knock body, a fixed cam, a rotating cam and a cam groove as described above, the writing tip of the writing body accommodated in the shaft cylinder from the tip opening of the shaft cylinder A structure in which a coil spring is disposed between the rotating cam and the knock body and the knock body is urged rearward and fixed to prevent the knock body from rattling when the portion is projected. However, in such a structure, naturally, a process for arranging the coil springs is required, and the coil springs are entangled with each other at the time of the process. The handling of the coil spring is troublesome. Moreover, the cost as a member of the coil spring is also increased, and the manufacturing cost is high due to the above. The present invention has been made in view of such problems, and when the writing tip of the refill accommodated in the shaft tube is protruded from the tip opening of the shaft tube without providing a coil spring, The purpose is to obtain a knock-type writing instrument that can determine from the state (length) whether the writing tip of the writing body is exposed from the opening of the tip of the shaft cylinder and that minimizes the rattling of the knocking body. It is.
[0009]
[Means for Solving the Problems]
According to the present invention, a fixed cam and a rotating cam that are slidable along a cam groove are disposed in a shaft cylinder, and an engagement portion formed on a rotating cam is engaged with a mountain-shaped uneven portion formed on the fixed cam. In the knock type writing instrument having a feeding mechanism that slides the fixed cam and the rotating cam by pressing the knock body and causes the writing tip portion of the writing body to protrude and retract from the tip opening portion of the shaft cylinder as the rotating cam rotates. The rotating cam is formed with a rod-like protrusion to be inserted into the fixed cam, and a locking protrusion protruding outward is formed on the outer peripheral surface of the rod-shaped protrusion, and the distal end opening of the shaft tube is formed from the locking protrusion. the inner wall surface of the stationary cam side, a locking stepped portion end surface protrudes inward possible contact of the locking projection, the distance of the locking direction along the end face or these axial projections The rotating cam can rotate with the distance in the direction along the axial center of the concave and convex portions of the fixed cam. Formed at a position of release, in which the end face of the engaging projection is characterized by being obtained by blocking the retraction of the fixed cam by abutting the locking stepped portion of the fixed cam.
[0010]
In the present invention, the knock body and the fixed cam may be provided integrally with the tip of the knock body, or the fixed cam may be formed separately and connected or fixed to the tip of the knock body. . The cam groove is formed in the shaft cylinder, but may have a structure formed on the inner wall surface of the shaft cylinder, or a cylindrical leg portion attached to the rear end portion of the shaft cylinder and the rear end of the shaft cylinder. A clip having an inner cylinder part to be inserted into the part may be mounted on the rear end of the shaft cylinder, and may be provided on the inner wall surface of the inner cylinder part.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the knock type writing instrument of the present invention will be described with reference to the drawings. As shown in the figure, the knock type writing instrument 1 of the present embodiment is formed in the same manner as the structure seen in the conventional knock type writing instrument 51 described above. As in the prior art, cam grooves 3-1 and shallow cam grooves 3-2 are formed alternately on the inner wall surface of the shaft cylinder 2 and extending along the axial direction in the axial radial direction. 3 is formed. The knock body 4 includes a fixed cam 7 having a mountain-shaped uneven portion 5 at the tip and a plurality of protrusions 6 engaging the cam groove 3 on the outer peripheral surface. It is inserted into the knock body 4 and fixed by an adhesive or the like, and is interlocked with the knock body 4. The protrusion 6 is formed so as to be positioned on the line (on the alternate long and short dash line) of the top 5a of the uneven portion 5.
[0012]
As shown in FIG. 7, the rotating cam 9 includes a meshing portion 10 that meshes with the concavo-convex portion 5, a cam portion 12 that has a plurality of cam protrusions 11 that engage with the cam groove 3 on the outer peripheral surface, and a fixed cam. 7 and a rod-like protrusion 13 that is loosely fitted in the inside. The rear end of the cam projection 11 is a meshing portion 10 constituted by an inclined surface 10 a that meshes with the concavo-convex portion 5. As in the prior art, the tip of the projecting piece 14 extending in the direction along the axis constituting the cam groove 3 is formed on the inclined wall surface 15, and the shallow cam groove 3-2 is formed on the cam projection 11 of the rotating cam 9. The cam protrusion 11 comes into contact with the bottom 16 of the cam groove 3-2 so that the cam groove 3-2 cannot engage and slide, and the tip of the cam groove 3-2 can be engaged with the inclined surface 10a of the cam protrusion 11. The locking portion 17 is provided. The rod-shaped protrusion 13 is formed with a locking projection 18 on the outer peripheral surface at the rear end.
[0013]
As in the prior art, the knock body 4 is disposed with the rear end portion exposed from the opening end portion of the shaft cylinder 2, and the fixed cam 7 is mounted with the projection 6 engaged with the cam groove 3. The rotating cam 9 is mounted by bringing the meshing portion 10 into contact with the concavo-convex portion 5 of the fixed cam 7 and engaging the cam projection 11 with the cam groove 3. On the inner wall surface of the mounting portion 8 of the fixed cam 7, as in the conventional case, a locking step that can come into contact with a locking projection 18 formed on the rod-shaped protruding portion 13 of the rotating cam 9 as the fixed cam 7 moves backward. The portion 19 is provided on the inner wall surface of the mounting portion 8 of the fixed cam 7. As shown in FIG. 3, the separation distance Xmm between the locking projection 18 and the locking step portion 19 is a direction along the axis from the top 10 b to the valley 10 c of the inclined surface 10 a of the meshing portion 10 of the rotating cam 9. distance: L mm is approximately equal, when the cam protrusion 11 of the rotating cam 9 is disengaged from the cam groove 3 is advanced a fixed cam 7 and the rotary cam 9 by the pressing of the knock member 4, the rotating cam 9 fixed cam 7 It is the distance that can be rotated away from. In order for the rotating cam 9 to be rotatable with respect to the fixed cam 7, the top 5 a of the concavo-convex portion 5 contacts the inclined surface 10 a of the meshing portion 10 from the state where the top 5 a of the concavo-convex portion 5 abuts the inclined surface 10 a of the meshing portion 10. It must be possible to move back and forth to a position where it abuts on the top 10b. In addition, the knock type writing instrument 1 of this Embodiment shown in FIGS. 1-3 provides the position of the latching protrusion 18 formed in the rotating cam 9 in the position near the cam part 12 side compared with a conventional one. In addition, the length of the rod-like protrusion 13 is shorter than that of the conventional rotating cam 9 shown in FIG.
[0014]
Although not shown, in front of the rotating cam 9, for example, a writing body such as a ballpoint pen refill containing ink is urged rearward (on the knocking body 54 side) by a coil spring, and the rear end portion thereof contacts the rotating cam 9. Since they are in contact with each other, the rotating cam 9 is always connected to the fixed cam 7.
[0015]
As shown in FIG. 9, the knock type writing instrument 1 of the present embodiment presses the knock body 4 toward the distal end of the shaft cylinder 2, so that the fixed cam 7 is connected to the deep cam groove 3 in conjunction with the knock body 4. -1 and the projection 6 engaged with the shallow cam groove 3-2, the rotating cam 9 connected to the fixed cam 7 is guided to the cam projections 11a and 11b engaged with the deep cam groove 3-1, and moves forward. To do. Due to the positional relationship between the protrusion 6 and the top 5a of the concavo-convex portion 5 in the fixed cam 7 as described above, the top 5a of the concavo-convex portion 5 is abutted at a position about the middle point of the inclined surface 10a of the meshing portion 10 of the rotating cam 9. Therefore, when the rotating cam 9 reaches the tip of the cam groove 3 and the cam protrusions 11a and 11b are detached from the cam groove 3, the rotating cam 9 receives the urging force to the rear of the writing body and tries to retreat. The top part 5a slides on the inclined surface 10a of the meshing part 10, and as a result, the rotary cam 9 rotates. Accordingly, as shown in the following figure, the rear end of the cam projection 11b slides against the inclined wall surface 15 of the locking portion 17 provided on the projecting piece 14 forming the cam groove 3, and a shallow cam as in the conventional case. Although located at a position facing the groove 3-2, the rear end of the cam protrusion 11b abuts against the bottom 16 of the cam groove 3-2, and the inclined surface 10a of the cam protrusion 11 is not engaged with the cam groove 3-2. Lock to the locking portion 17. Thereby, the writing front-end | tip part (not shown) of a writing body (not shown) is maintained in the state protruded from the front-end | tip opening part (not shown) of the axial cylinder 2. FIG.
[0016]
At this time, the rotating cam 9 is not rattled in the shaft cylinder 2 because the cam projection 11 is locked to the locking portion 17 of the cam groove 3 by receiving the urging force to the rear of the writing body. Fixed cam 7 and the knock member 4 is also slightly retracted, but because the locking stepped portion 19 of the fixed cam 7 is abuts the locking projection 18 of the rotating cam 9 stops at slightest retreat.
[0017]
Similarly to the conventional knock-type writing instrument, when the knock body 4 is pressed again in the direction of the distal end of the shaft tube 2, the knock body 4 and the fixed cam 7 abut against the rotating cam 9 and advance, The rear end portion of the cam projection 11 of the rotating cam 9 is the locking portion 17 of the cam groove 3 because of the same action as described above due to the contact of the top portion 5a of the portion 5 with the inclined surface 10a of the meshing portion 10 of the rotating cam 9. The cam projection 11 engages with the cam groove 3 and rotates, and the rotating cam moves backward together with the fixed cam and the knock body to return to the original position.
[0018]
【The invention's effect】
Since the knock-type writing instrument of the present invention has the structure as described above, it can be determined from the state (position) of the knock body whether the writing tip of the writing body protrudes from the tip opening of the shaft tube, and further the writing In the state where the writing tip of the body protrudes from the tip opening of the shaft tube, the body moves slightly back and forth, but the knocking body can be suppressed by only slightly shaking.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view of an essential part showing an embodiment of a knock type writing instrument of the present invention.
FIG. 2 is a longitudinal sectional view of a main part of the knock type writing instrument showing a state where the knock body is pressed in FIG. 1;
3 is an enlarged view of a main part showing a positional relationship between a locking step formed on the fixed cam and a locking projection formed on the rotating cam in FIG. 1. FIG.
FIG. 4 is a longitudinal sectional view showing a cam groove portion of a shaft cylinder in a conventional knock type writing instrument.
FIG. 5 is an enlarged cross-sectional view taken along line II in FIG.
FIG. 6 is an enlarged plan view of a fixed cam in a conventional knock type writing instrument.
FIG. 7 is an enlarged plan view of a rotating cam in a conventional knock type writing instrument.
8 is a bottom view of the rotating cam in FIG. 7. FIG.
FIG. 9 is a conceptual diagram showing a positional relationship among a cam groove, a concavo-convex portion and a projection of a fixed cam, a meshing portion of a rotating cam, and a cam projection in a knock type writing instrument.
FIG. 10 is a longitudinal sectional view of an essential part showing an embodiment of a conventional knock type writing instrument.
FIG. 11 is a longitudinal sectional view of a main part of the knock type writing instrument showing a state where the knock body is pressed in FIG. 10;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Knock type writing instrument 2 Shaft cylinder 3 (3-1, 3-2) Cam groove 4 Knock body 5 Uneven part 6 Protrusion 7 Fixed cam 9 Rotating cam 10 Engagement part 10a Inclined surface 10b Top part 10c Valley part 11 (11a, 11b) Cam protrusion 13 Bar-shaped protrusion 18 Locking protrusion 19 Locking step

Claims (1)

  1. A fixed cam and a rotating cam that are slidable along the cam groove are arranged in the shaft cylinder, and a meshing portion formed on the rotating cam is engaged with a chevron-shaped uneven portion formed on the fixed cam. In the knock type writing instrument having a feeding mechanism in which the fixed cam and the rotating cam are slid by pressing and the writing tip portion of the writing body is projected and retracted from the tip opening portion of the shaft cylinder as the rotating cam rotates. And a locking projection that protrudes outwardly from the outer peripheral surface of the rod-shaped protruding portion and is formed on the distal end opening side of the shaft tube from the locking projection. of the inner wall surface, the locking stepped portion end surface of the locking projection is projected inwardly capable of contacting, separation distance of the locking direction along the end face or these axial projections, the fixed cam Position of the distance that the rotary cam can rotate, approximately the same as the distance along the axis of the uneven part Provided, knock type writing tool end face of the engaging projection is characterized by being obtained by blocking the retraction of the fixed cam by abutting the locking stepped portion of the fixed cam.
JP2002113095A 2002-04-16 2002-04-16 Knock-type writing instrument Expired - Fee Related JP3960847B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2002113095A JP3960847B2 (en) 2002-04-16 2002-04-16 Knock-type writing instrument

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2002113095A JP3960847B2 (en) 2002-04-16 2002-04-16 Knock-type writing instrument

Publications (2)

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JP2003305990A JP2003305990A (en) 2003-10-28
JP3960847B2 true JP3960847B2 (en) 2007-08-15

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Publication number Priority date Publication date Assignee Title
CN102741061A (en) * 2010-02-03 2012-10-17 百乐墨水株式会社 Writing tool
CN103722946A (en) * 2013-12-25 2014-04-16 宁波江北瑞臣工艺品设计有限公司 Pen which cannot be opened by children
CN103738081A (en) * 2013-12-25 2014-04-23 宁波江北瑞臣工艺品设计有限公司 Pen which cannot be opened by child

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JP4853959B2 (en) * 2006-06-29 2012-01-11 三菱鉛筆株式会社 mechanical pencil
JP4855341B2 (en) * 2007-06-05 2012-01-18 株式会社パイロットコーポレーション Knock-type writing instrument
BRPI0702208A2 (en) * 2007-07-20 2009-03-10 Marcial Trilha Jr rotational translational motion transformation system
JP5036600B2 (en) * 2008-03-06 2012-09-26 株式会社パイロットコーポレーション Intrusion mechanical pencil
JP5813929B2 (en) * 2010-02-03 2015-11-17 パイロットインキ株式会社 writing instrument
JP5706107B2 (en) * 2010-02-03 2015-04-22 パイロットインキ株式会社 Thermochromic writing instrument
JP4676562B1 (en) * 2010-04-08 2011-04-27 雄樹 栗原 Double knock mechanism
JP4908648B1 (en) * 2011-06-22 2012-04-04 雄樹 栗原 Double knock mechanism
JP5951220B2 (en) * 2011-10-31 2016-07-13 株式会社パイロットコーポレーション Intrusive writing instrument
JP5815141B2 (en) 2013-05-23 2015-11-17 オリンパス株式会社 Dial device
CN103754013B (en) * 2013-12-25 2015-10-14 宁波江北瑞臣工艺品设计有限公司 A kind of pen avoiding child
CN103722941B (en) * 2013-12-25 2015-10-14 宁波江北瑞臣工艺品设计有限公司 The pen that a kind of child cannot open
CN103722940B (en) * 2013-12-25 2015-10-14 宁波江北瑞臣工艺品设计有限公司 The pen that a kind of child of preventing opens
CN103722943B (en) * 2013-12-25 2015-10-14 宁波江北瑞臣工艺品设计有限公司 Prevent the safety pen that child opens
CN103722939B (en) * 2013-12-25 2015-10-14 宁波江北瑞臣工艺品设计有限公司 Avoid the pen of child
WO2017104468A1 (en) * 2015-12-18 2017-06-22 株式会社パイロットコーポレーション Click-type writing instrument

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102741061A (en) * 2010-02-03 2012-10-17 百乐墨水株式会社 Writing tool
CN102741061B (en) * 2010-02-03 2015-10-14 百乐墨水株式会社 Pen
CN103722946A (en) * 2013-12-25 2014-04-16 宁波江北瑞臣工艺品设计有限公司 Pen which cannot be opened by children
CN103738081A (en) * 2013-12-25 2014-04-23 宁波江北瑞臣工艺品设计有限公司 Pen which cannot be opened by child
CN103738081B (en) * 2013-12-25 2015-10-14 宁波江北瑞臣工艺品设计有限公司 The pen that children cannot open
CN103722946B (en) * 2013-12-25 2015-10-14 宁波江北瑞臣工艺品设计有限公司 The pen of children unopenable

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