Rotate to release writing tools

Abstract

The present invention provides a rotary delivery writing tool in which a front end writing portion protruding from a front end opening hole can be maintained in a straight state (straight line state) parallel to the axial center line of a pen barrel. A plurality of writing elements (9) are accommodated in a pen barrel (2), each writing element (9) is supported by a guide tube (11) so as to be movable in the axial direction of the pen barrel (2), and a front end writing portion (9a) of a writing element (9) is selectively made to protrude from an opening hole (6a) provided in a pen head (6) of the pen barrel by a cylindrical cam (15) fixed in the pen barrel that receives a relative rotation operation of the guide tube (11) relative to the pen barrel (2). By forming the opening hole (6a) of the pen head (6) at a position eccentric to the axial center line of the pen barrel, the writing element (9) in a state where the front end writing portion (9a) protrudes from the opening hole (6a) maintains a straight line state.

Description

Technical Field

[0001] The invention relates to a rotary delivery writing tool which contains a plurality of writing elements in a pen barrel and selectively allows the front end portions of the writing elements to protrude from the front portion of the pen barrel. Background Art

[0002] Provided is a writing tool having a structure in which a plurality of writing elements (pen cores) are housed in a pen barrel and a front writing portion is selectively protruded from a front end portion of the pen barrel by a predetermined feeding operation.

[0003] As a mechanism for delivering one of the multiple writing elements housed in a pen barrel, there is a mechanism called a rotary delivery type. Most of the rotary delivery type writing tools rotate the rear pen barrel relative to the front pen barrel, thereby selectively extending and retracting the front end writing portion of the writing element from an opening hole formed at the front end of the front pen barrel.

[0004] Various improvements and proposals have been made in the past regarding this type of rotary-feed writing tool, and the applicant has also made several proposals regarding the rotary-feed writing tool, one example of which is disclosed in Japanese Patent Application Publication No. 2012-61605 (Patent Document 1).

[0005] According to the rotary delivery writing tool disclosed in Patent Document 1, a slide block that is in sliding contact with a cam is disposed at the rear end of each writing element housed in the pen barrel. Then, by rotating the cylindrical cam installed in the rear pen barrel together with the rear pen barrel relative to the front pen barrel, the slide block is moved forward and backward by the cylindrical cam, and the front end writing portion of one writing element can be selectively protruded from the opening hole formed at the front end portion of the front pen barrel.

[0006] In addition, according to the rotary delivery writing tool disclosed in Patent Document 1, three writing elements (pen cores) housed in the pen barrel are supported by guide tubes so as to be movable in the axial direction. Furthermore, the three writing elements are arranged in a mutually parallel state along the axial center line, avoiding the axial center line of the pen barrel.

[0007] In addition, a front end opening hole for the front end writing part of the writing element to selectively extend and retract is formed at the front end of the pen head, which is arranged at the front end of the pen body, for example, in a conical shape. Therefore, a structure is adopted in which the front end opening hole for the front end writing part to extend and retract is formed on the axial center line of the pen body.

[0008] According to this structure, the writing element selected for writing is deformed in a non-linear manner by bending only the front writing portion from a position away from the axial center line of the pen holder toward the axial center line of the pen holder. Therefore, the front writing portion protruding from the front opening hole is slightly bent relative to the axial center line of the pen holder, and everyone has experienced the feeling of incongruity in appearance. Summary of the invention

[0009] Problem that the invention aims to solve

[0010] The present invention is made with an eye on the above-mentioned previous rotary delivery writing tools, and its main purpose is to provide a rotary delivery writing tool, which is constructed so that the front writing part protruding from the front opening hole can remain parallel to the axial center line of the pen shaft in a straight state (straight state), so that the appearance will not feel inconsistent as described above, but will be more balanced.

[0011] Solutions for solving problems

[0012] The rotary delivery writing tool of the present invention, which is manufactured to solve the above-mentioned problems, contains a plurality of writing elements in a pen shaft, each of which is supported by a guide tube so as to be movable in the axial direction of the pen shaft, and a cylindrical cam which receives the relative rotation operation of the guide tube relative to the pen shaft and is fixed in the pen shaft is used to selectively make the front end writing portion of one of the writing elements protrude from an opening hole of a pen tip component provided on the pen shaft. The tool is characterized in that the opening hole of the pen tip component is formed at a position eccentric to the axial center line of the pen shaft, so that the writing element maintains a straight state when the front end writing portion protrudes from the opening hole.

[0013] In this case, in a preferred technical solution, the following structure is adopted: there are more than three writing elements, and a sliding block is connected to the rear end of each writing element, which is in sliding contact with the cylindrical cam to move the writing element in the axial direction of the pen shaft. The cylindrical cam fixed in the pen shaft has: a cam flat portion formed in an arc shape along the circumferential direction, a pair of left and right cam inclined surfaces formed in a manner that tapers forward from both end sides of the cam flat portion, and a cam top of a specified width connecting the front ends of the pair of cam inclined surfaces. The sliding block connected to the writing element abuts against the cam top, so that the front end writing portion of the writing element protrudes from the opening hole of the pen head component. In this state, the sliding block connected to other writing elements is located on the cam flat portion.

[0014] Furthermore, it is desirable that the cross-sectional shape of the pen tip member perpendicular to the axial direction of the pen body is a non-circular shape.

[0015] Furthermore, it is desired that the pen shaft includes a front pen shaft and a rear pen shaft, the nib component is mounted on the front end portion of the front pen shaft, and the rear pen shaft is connected to the front pen shaft by means of a coupling, thereby forming the pen shaft, and an alignment opening is formed along the axial direction in either the nib component or the coupling, and a convex portion inserted into the alignment opening along the axial direction is formed in the other of the nib component and the coupling, and the convex portion is inserted into the alignment opening in the front pen shaft, thereby forming an alignment mechanism in the axial rotation direction between the nib component and the coupling.

[0016] In addition, in a preferred technical solution, a ballpoint pen tip is used as the front writing part, and the cylindrical pen tip is provided with a neck portion whose outer diameter gradually decreases in a concave shape from the part with the largest outer diameter toward the front end.

[0017] In addition, in another preferred technical solution, preferably, one of the writing elements is an input pen that can operate on the screen of the electronic device terminal.

[0018] Effects of the Invention

[0019] According to the rotary delivery writing tool of the present invention, the plurality of writing elements housed in the pen barrel are supported by the guide tubes that receive manual rotation operation so as to be movable in the axial direction. Thus, the guide tubes receive the rotational motion, and the front end writing portion of each writing element is selectively protruded from the opening hole provided in the pen head member of the pen barrel in sequence under the interaction with the cylindrical cam fixed in the pen barrel.

[0020] In this case, the opening hole of the pen tip member is formed at a position eccentric to the axial center line of the pen holder, so that the writing element with the front end writing portion protruding from the opening hole can maintain a substantially straight state (straight state) in the pen holder. Therefore, the problem that the front end writing portion of the conventional rotary delivery writing tool protrudes in a posture bent relative to the axis of the pen holder can be solved.

[0021] In addition, since the cylindrical cam that makes the front end writing part of the writing element protrude has a pair of left and right cam slopes formed in a manner that becomes a tapered shape toward the front, the front end writing part can be replaced regardless of which direction the guide tube is rotated.

[0022] Thus, for such a rotary-feed writing tool in which three or more writing elements are accommodated in the pen barrel, a desired writing element can be quickly selected. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a three-dimensional view showing the appearance structure of the rotary delivery writing tool of the present invention.

[0024] Figure 2 The overall structure of the rotary delivery writing tool is shown. Figure 2 (A) is the main view, Figure 2 (B) is a central cross-sectional view.

[0025] Figure 3 It is Figure 2 An enlarged cross-sectional view of line a-a observed along the direction of the arrow.

[0026] Figure 4 This is a perspective view showing a state in which the front pen body is removed and the writing element (pen core) can be replaced.

[0027] Figure 5 The pen holder is removed and the front writing part is sent out. Figure 5 (A) is a stereoscopic view observed from the surface side, Figure 5 (B) is a stereoscopic view viewed from the back side.

[0028] Figure 6 The pen holder is removed and the front writing part is stored. Figure 6 (A) is a stereoscopic view observed from the surface side, Figure 6 (B) is a stereoscopic view viewed from the back side.

[0029] Figure 7 Yes Figure 1 The rotary delivery writing tool shown is disassembled into an expanded view of the components. Figure 7 (A) is the main view, Figure 7 (B) is a stereogram.

[0030] Figure 8 The single-piece structure of the front pen barrel is shown. Figure 8 (A) is a stereogram, Figure 8 (B) is the main view, Figure 8 (C) is a central cross-sectional view.

[0031] Fig.9A Represents the single-piece structure of the pen tip component, Fig.9A (A) is the top view, Fig.9A (B) is the main view, Fig.9A (C) is the bottom view. Fig.9A (D) is a central cross-sectional view.

[0032] Fig. 9B Represents the single-piece structure of the pen tip component, Fig. 9B (E) is a stereoscopic view viewed from the front end side. Fig. 9B (F) is a three-dimensional view in which the image is reversed upside down and viewed from the rear end side. Fig. 9B (G) is the left side view, Fig. 9B(H) is a right side view.

[0033] Fig.10 The single-piece structure of the rear pen barrel is shown. Fig.10 (A) is a stereogram, Fig.10 (B) is the main view, Fig.10 (C) is the central cross-sectional view. Fig.10 (D) is the right side view.

[0034] Fig.11A Showing the one-piece construction of the cylindrical cam, Fig.11A (A) is the top view, Fig.11A (B) is the main view, Fig.11A (C) is the central cross-sectional view. Fig.11A (D) is a bottom view.

[0035] Fig. 11B Showing the one-piece construction of the cylindrical cam, Fig. 11B (E) is a stereogram, Fig. 11B (F) is the left side view. Fig. 11B (G) is the right side view.

[0036] Fig.12 It shows the state where the cylinder cam is to be installed on the rear pen barrel. Fig.12 (A) is the main view, Fig.12 (B) is the central cross-sectional view. Fig.12 (C) is a stereogram, Fig.12 (D) is an enlarged side view viewed from the axial direction.

[0037] Fig.13 The single-piece structure of the guide cylinder is shown. Fig.13 (A) is a stereogram, Fig.13 (B) is a top view. Fig.13 (C) is the main view, Fig.13 (D) is a central cross-sectional view.

[0038] Fig.14 Shows the single-piece construction of the coupling, Fig.14 (A) is the top view, Fig.14 (B) is the main view, Fig.14 (C) is the central cross-sectional view. Fig.14 (D) is a stereogram.

[0039] Fig.15 The single-piece structure of the knob is shown, Fig.15 (A) is a stereogram, Fig.15 (B) is the main view, Fig.15 (C) is a central cross-sectional view.

[0040] Description of Reference Numerals

[0041] 1. Rotating to deliver the writing tool; 2. Pen barrel; 3. Front pen barrel; 4. Rear pen barrel; 5. Coupling; 5a. Large diameter portion; 5b. Alignment opening; 6. Pen tip member; 6a. Opening hole; 6d. Protruding portion; 7. Knob; 8. Pen clip; 9. Writing element (ballpoint pen refill); 9a. Front writing portion (ballpoint pen tip); 9b. Neck contraction; 9c. Writing ball; 11. Guide cylinder; 11a. Guide hole; 11c. Rod body; 12. Sliding block; 12a. Small protrusion; 12b. Protruding portion; 13. Coil spring; 15. Cylinder cam; 15a. Cam flat portion; 15b. Cam slope; 15c. Cam top; 16. Tail bolt joint; 17. Tail bolt; L1. Axis centerline of the pen barrel; L2. Axis line of the opening hole of the pen tip member; U1. Front pen barrel unit; U2. Rear pen barrel unit. DETAILED DESCRIPTION

[0042] The rotary feed writing tool of the present invention will be described based on an embodiment using a ballpoint pen refill as a writing element.

[0043] In addition, in the figures shown below, the same parts are represented by the same figure marks, but in some of the figures, representative parts are sometimes marked with figure marks for convenience on paper, and their details are explained by referring to the figure marks marked in each figure showing each component as a unit.

[0044] The rotary delivery writing tool 1 is as shown in Figure 1 and Figure 2 As shown in the overall structure in FIG. 1 , the pen barrel 2 constituting the outer contour includes a front pen barrel 3 and a rear pen barrel 4, and the front pen barrel 3 and the rear pen barrel 4 are connected in a straight line by means of a coupling 5. In addition, a pen head member 6 is mounted on the front end portion of the front pen barrel 3, and a front end writing portion (ballpoint pen tip) 9a of a ballpoint pen core 9 constituting a writing element protrudes from the pen head member 6.

[0045] In addition, a knob 7 is mounted on the rear end of the rear pen barrel 4 so as to be rotatable relative to the rear pen barrel 4, and by rotating the knob 7, a ballpoint pen tip 9a protruding from the pen tip member 6 can be selected. In addition, a base end of a pen clip 8 is mounted on the rear end of the rear pen barrel 4 at a boundary portion between the rear pen barrel 4 and the knob 7.

[0046] Also like Figure 4As shown, three ballpoint pen refills 9 are accommodated as writing elements in the pen barrel 2 in a manner parallel to the axis of the pen barrel 2. The three ballpoint pen refills 9 are respectively held in a guide cylinder 11 that is axially rotatably arranged at the rear end side of the rear pen barrel 4 in a manner that allows them to move in the axial direction. In addition, by setting at least one of the ballpoint pen refills 9 as an input pen that can be operated on the screen of the electronic device terminal, it can be used for writing and input to the terminal, respectively, and can be used as a wide range of composite writing tools.

[0047] That is, the guide tube 11 is formed with guide holes 11a described later into which the rear end portions of the three ballpoint pen refills 9 are inserted, and in the guide holes 11a, Figure 5 to Figure 7 As shown, a sliding block 12 is housed.

[0048] The slide block 12 is urged toward the inner bottom of the guide hole 11a by coil springs 13 disposed between the slide block 12 and a spring support 14 mounted on the front end of the guide tube 11. Figure 2 ) is engaged with the rear end portion of the ink storage tube of the ballpoint pen refill 9, so that the ballpoint pen refill 9 is held by the sliding block 12.

[0049] Therefore, when wanting to replace the ballpoint pen core 9, Figure 4 As shown, the front pen holder 3 is pulled out from the coupling 5, and the front pen holder unit U1 is separated from the rear pen holder unit U2. In this state, the ballpoint pen refill 9 to be replaced is pulled forward. As a result, the slide block 12 advances in the guide tube 11, and the rear end of the ballpoint pen refill 9 is separated from the small protrusion 12a of the slide block 12 while the coil spring 13 is compressed to the maximum extent. Then, a new ballpoint pen refill 9 is inserted, so that the rear end of the ballpoint pen refill 9 is engaged with the small protrusion 12a of the slide block 12, and the new ballpoint pen refill 9 is held again by the slide block 12.

[0050] In this embodiment, when you want to replace the ballpoint pen refill 9, Figure 4 As described above, the front pen shaft unit U1 is replaced by being axially pulled out from the rear pen shaft unit U2. Furthermore, when the front pen shaft unit U1 is installed on the rear pen shaft unit U2, the front pen shaft unit U1 is axially pressed toward the rear pen shaft unit U2, so that the front pen shaft unit U1 is axially engaged (so-called loose engagement) and installed on the coupling 5 on the rear pen shaft unit U2 side.

[0051] like Figure 2As shown, a rod body 11c described later is formed at the rear end side of the guide tube 11, and the knob 7 is mounted on the end of the rod body 11c. Therefore, by turning the operation knob 7, the guide tube 11 is configured to rotate the axis in a state where three ballpoint pen refills 9 are mounted.

[0052] like Figure 2 , Figure 5 , Figure 6 As shown, a cylindrical cam 15 is installed in the rear pen barrel 4 in a manner of surrounding the rear half of the guide cylinder 11.

[0053] By rotating the knob 7, the guide tube 11 rotates, and the convex portion 12b (see Figure 2 , Figure 5 , Figure 6 ) gradually rises along the cam slope 15b described later of the cylindrical cam 15, thereby, the slide block 12 moves forward. Regarding the detailed structure of the cylindrical cam 15, the cylindrical cam 15 is shown in the following based on the single-piece structure. Fig.11A and Fig. 11B Provide explanation.

[0054] like Figure 1 and Figure 2 As shown, the front writing portion (ballpoint pen tip) 9a of the ballpoint pen refill 9 to which the sliding block 12 is mounted has protruded from the opening hole 6a of the pen tip member 6, and is in a state where writing is possible.

[0055] Hereinafter, each member constituting the above-mentioned rotary feed writing instrument 1 will be described based on the drawings showing each member as a unit.

[0056] Figure 8 : represents the single-piece structure of the front pen barrel 3. The front pen barrel 3 is preferably formed into a cylindrical shape using a metal raw material such as aluminum, and the front end is cut obliquely to form an inclined cut portion 3a, and the rear end is cut in a state perpendicular to the axis. In addition, shallow grooves 3b along the axial direction are concentratedly implemented at multiple locations around the axis on the outer cylindrical surface of the front pen barrel 3. When the writing tool 1 is held and rotated, the front pen barrel 3 functions as a grip.

[0057] In addition, if Figure 8 As shown in (C), the inner circumference of the rear end of the front pen barrel 3 is slightly thickened to form a thick wall portion 3c. The thick wall portion 3c is a thin-walled pipe member 21 (see FIG. 2 ) formed of brass or the like and arranged along the inner circumference of the front pen barrel 3. Figure 7 That is, the pipe member 21 is inserted from the inclined cut portion 3a side of the front end side of the front pen body 3 and arranged in the front pen body 3, and the thick wall portion 3c that functions as a stopper is used to position the pipe member 21.

[0058] Fig.9A and Fig. 9B The single-piece structure of the pen tip member 6 is shown. The pen tip member 6 is formed of a resin material such as ABS (acrylonitrile butadiene styrene) and is attached to the front end of the front barrel 3.

[0059] As described above, an opening hole 6a through which the ballpoint pen tip 9a protrudes is formed at the front end of the pen tip member 6. In addition, a cylindrical portion 6b is formed at the rear end side of the pen tip member 6, and the cylindrical portion 6b is mounted on the front pen barrel 3 in a state of being fitted with the pipe member 21 disposed in the front pen barrel 3.

[0060] In addition, the pen tip member 6 has an abutment portion 6c obliquely formed thereon for abutting against the oblique cut portion 3a of the front pen barrel 3 , and the rear half of the pen tip member 6 bounded by the oblique abutment portion 6c is accommodated and installed in the front pen barrel 3 .

[0061] Moreover, if Fig.9A As shown in (D) of FIG. 1 , in the pen tip member 6 , the opening hole 6 a formed at the front end portion of the pen tip member 6 is formed at a position eccentric from the axial center line of the pen barrel 2 .

[0062] That is, the axial center line L1 of the pen body 2 corresponds to the axis line of the cylindrical portion 6b formed by the pen tip member 6, and the axis line of the opening hole 6a of the pen tip member 6 is indicated by reference numeral L2.

[0063] This is because the ballpoint pen refill 9 with the front writing portion (ballpoint pen tip) 9a protruding from the opening hole 6a of the pen head member 6 is located slightly away from the axial center line L1 of the pen body 2, and the position of the opening hole 6a is intentionally eccentric accordingly.

[0064] Thereby, the ballpoint pen refill 9 with the tip writing portion 9a protruding from the opening hole 6a can be brought into a straight state (straight state) in the pen barrel 2.

[0065] Therefore, since the pen tip member 6 of this embodiment includes the above-mentioned structure, the generally used conical pen tip member is not adopted, but the cross-sectional shape of the pen tip member 6 orthogonal to the axial direction of the pen body 2 is made into a non-circular shape.

[0066] The pen tip member 6 has an arc-shaped convex portion 6d formed integrally with the cylindrical portion 6b further toward the rear end from the cylindrical portion 6b. Three ribs 6e are formed along the axial direction on the arc-shaped inner peripheral surface of the convex portion 6d.

[0067] The convex portion 6d forms a positioning mechanism in the shaft rotation direction between the convex portion 6d and a positioning opening 5b formed in the coupling 5 described later.

[0068] In addition, the three ribs 6e play the following role: when the coupling 5 is brought into contact with the pen tip member 6 without being aligned in the axial rotation direction, it prevents the coupling 5 from being assembled in a state where a part of the coupling 5 is pressed against the arc-shaped inner circumferential surface of the convex portion 6d formed on the pen tip member 6.

[0069] Furthermore, in this embodiment, the ballpoint pen refill 9 whose front writing portion protrudes from the opening hole 6a is constructed so as to maintain a straight state (straight state) in the pen shaft 2 by forming the opening hole 6a of the pen tip member 6 at a position eccentric to the axial center line of the pen shaft 2. In addition, the shape of the front writing portion (ballpoint pen tip) 9a of the ballpoint pen refill 9 used in this embodiment is also studied.

[0070] That is, Figure 4 As shown in the enlarged view of the front end writing part (ballpoint pen tip) 9a of the ballpoint pen refill 9, the ballpoint pen tip 9a used in the ballpoint pen refill 9 is provided with a concave curved surface-shaped concave portion 9b whose outer diameter gradually decreases from the part with the largest outer diameter of the ballpoint pen tip 9a toward the front end. That is, the side surface of the concave curved surface of the concave curved surface is formed, and a writing ball 9c is attached to the front end of the ballpoint pen tip 9a with a relatively thin diameter by means of a caulking process.

[0071] By using this ballpoint pen tip 9a, compared with the conventional ballpoint pen refill having a conical tapered portion at the tip, not only can the pen tip be made to look thinner, but also a practical effect can be obtained in that the traced portion at the tip can be easily seen during writing.

[0072] In particular, the ballpoint pen refill 9 set in a writable state as described above is configured in a manner to maintain a straight state (straight state) within the pen body 2, and the ballpoint pen tip 9a at the front end of the ballpoint pen refill 9 uses a ballpoint pen tip having a concave neck portion 9b, so that these structures work synergistically to help this rotating delivery writing tool 1 have a unique aesthetic appearance.

[0073] Fig.10 The single-piece structure of the rear pen holder 4 is shown. The rear pen holder 4 is formed into a regular hexagonal cylindrical shape by press forming using aluminum as a raw material, for example. The front end portion thereof is open, and an end face 4a is formed at the rear end portion by bending. In addition, a pair of notches 4b are formed along the axial direction from the end face 4a, and the pair of notches 4b serve as through holes for a pair of base ends of the pen clip 8.

[0074] The end surface 4 a has an opening at its center, forming a through hole 4 c for a male screw 16 a or the like provided on a tail plug joint 16 described later.

[0075] The cylindrical cam 15, the guide tube 11, and the coupling 5 described below are sequentially inserted from the front end opening side of the rear pen barrel 4 to form a Figure 4 The rear pen holder unit U2 shown in the figure. Hereinafter, each component will be described in sequence.

[0076] Fig.11A and Fig. 11B FIG. 1 shows a single-piece structure of the cylindrical cam 15. The cylindrical cam 15 is made of a resin raw material such as POM (polyacetal). Fig.11A As shown in (A), the front half 15A is formed into a cylindrical shape to constitute a cam forming portion, and the rear half 15B is formed with a smaller diameter to constitute a mounting portion and a shaft support hole of the cylindrical cam.

[0077] The front half 15A has a cam flat portion 15a formed in an arc shape along the circumferential direction. In addition, a pair of left and right cam slopes 15b are formed in a manner that tapers forward from both ends of the cam flat portion 15a. The pair of cam slopes 15b are each formed in a symmetrical arc shape along the axial direction, and the front ends thereof are connected to both ends of a cam top portion 15c having a predetermined width.

[0078] The cam top 15c is a convex portion 12b of the slide block 12 connected to the selected writing element (ballpoint pen refill) 9 (see Figure 5 , Figure 6 ) abuts against the cam, and therefore, as shown in the accompanying drawings, the cam top 15c is formed into a gentle concave shape to improve stability.

[0079] In addition, in this embodiment, a pair of recessed portions 15d are formed at the boundary between the cam flat portion 15a and the cam inclined surface 15b, and the convex portions 12b of the slide block 12 connected to the other two writing elements that are not selected are respectively located in the recessed portions 15d. Therefore, when the convex portions 12b of each slide block 12 are fitted into the pair of recessed portions 15d, a moderate snap-fit ​​feeling can be obtained.

[0080] The rear half 15B of the cylindrical cam 15 forms a small diameter portion 15e, and a pair of locking protrusions 15f are formed in the small diameter portion 15e in the upper and lower directions. The metal tail bolt joint 16 formed in an annular shape is mounted by using the small diameter portion 15e and the locking protrusions 15f (see Figure 7 , Fig.12 The tail bolt joint 16 is used to mechanically mount the cylindrical cam 15 and the base end of the pen clip 8 in the rear part of the rear pen barrel 4.

[0081] Moreover, if Fig.11AAs shown in (C), an axial hole 15g is formed in the small diameter portion 15e, and the rod body 11c of the guide tube 11 is inserted into the axial hole 15g, thereby realizing the function of supporting the guide tube 11 so as to be rotatable.

[0082] Furthermore, four ribs 15h are formed in parallel along the axial direction on the cylindrical surface between the cam flat portion 15a and the small diameter portion 15e. When the cylindrical cam 15 is inserted and fixed in the rear pen barrel 4, the ribs 15h contact four locations of the inner edge portion of the rear pen barrel 4 formed in a regular hexagonal cylindrical shape, thereby restricting the movement (wobbling) of the cylindrical cam 15 in the axial rotation direction relative to the rear pen barrel 4.

[0083] Fig.12 The state where the cylindrical cam 15 is inserted into the rear pen barrel 4 and fixed is shown. When the cylindrical cam 15 is inserted into the rear pen barrel 4, the tail bolt joint 16 is inserted into the small diameter portion 15e of the cylindrical cam 15. As described above, a pair of locking protrusions 15f are formed on the small diameter portion 15e of the cylindrical cam 15. The tail bolt joint 16 is attached to the small diameter portion 15e in a state where it is locked by the pair of locking protrusions 15f and cannot rotate.

[0084] Then, the cam top 15c of the cylindrical cam 15 is inscribed in the surface 4d sandwiched between a pair of notches 4b formed in the rear pen body 4 formed in the shape of a regular hexagonal cylinder (see Fig.12 The cylindrical cam 15 is inserted into the rear pen barrel 4 in the manner of the inner surface side of (C)〕.

[0085] In addition, if Fig.12 As shown in FIG. 1 (B), the tail bolt joint 16 is provided with an external thread 16 a.

[0086] exist Fig.12 In the state shown, the left and right base ends of the pen clip 8 formed in a U shape are inserted into a pair of notches 4b formed in the rear pen barrel 4. In this state, the cylindrical cam 15 is pressed toward the rear portion of the rear pen barrel 4, and the small diameter portion 15e of the cylindrical cam 15 and the external thread 16a of the tail bolt joint 16 protrude from the external thread through hole 4c of the rear pen barrel 4.

[0087] In this state, the annular tail plug 17 (see Figure 7 ) is screwed into the external thread 16a of the tail bolt joint 16 protruding at the rear of the rear pen barrel 4, thereby installing the cylindrical cam 15 and the pen clip 8 at the rear of the rear pen barrel 4.

[0088] also, Figure 3 The main parts including the cylindrical cam 15 and the pen clip 8 attached to the rear portion of the rear pen barrel 4 are shown in a cross-sectional view in an attached state.

[0089] Fig.13The single-piece structure of the guide tube 11 is shown. Regarding the guide tube 11, a part of it will be described first, but the entire guide tube 11 is made of a transparent resin material such as PC (polycarbonate). In addition, in the front half, guide holes 11a for inserting the rear end portions of the three ballpoint pen refills 9 are formed at equal intervals and parallel to each other around the axis.

[0090] Furthermore, for each guide hole 11a, a slit 11b is formed along the length direction of each guide hole 11a so as to communicate with the side surface of the guide tube 11. The convex portion 12b (see Figure 2 , Figure 5 , Figure 6 ) is located in the slit 11b toward the outside. Moreover, the convex portion 12b of the slide block 12 is configured to contact the cam slope 15b of the cylindrical cam 15 and to be able to move in the guide hole 11a. Thus, the ballpoint pen core 9 is moved forward.

[0091] The coil springs 13 are accommodated in the guide holes 11 a of the guide tube 11 on the front side of the slide block 12 , and the front ends of the coil springs 13 are locked by the spring support portions 14 attached to the front ends of the guide tube 11 .

[0092] Thus, as described above, by forming the small protrusion 12a (see Figure 2 ) is engaged with the rear end of the ink storage tube of the ballpoint pen refill 9, so that the ballpoint pen refill 9 is held by the sliding block 12, and each ballpoint pen refill 9 is urged in the backward direction by the coil spring 13.

[0093] A cylindrical rod body 11c with a small diameter is formed in the rear half of the guide tube 11, and a short groove 11d is formed in the rear end of the rod body 11c along the axial direction. In addition, a fitting part 11e with an outer diameter in an axially concave-convex state is formed along the groove 11d.

[0094] The rod body 11c is connected to the axial hole 15g of the cylindrical cam 15 installed in the rear end of the rear pen shaft 4, supporting the guide tube 11 so that it can rotate axially. In addition, when the rotation and delivery writing tool 1 is installed, the groove portion 11d and the interlocking portion 11e protrude from the rear pen shaft 4 and are used to install the knob 7.

[0095] Fig.14 The single-piece structure of the coupling 5 is shown. The coupling 5 is also formed of a resin material such as ABS, similar to the pen tip member 6 described above, and is attached to the front end of the rear pen body 4.

[0096] That is, after the cylindrical cam 15 and the guide tube 11 are inserted into the rear pen barrel 4 , the coupling 5 is finally installed on the front end portion of the rear pen barrel 4 .

[0097] The coupling 5 is cylindrical in shape as a whole, and a large diameter portion 5a is formed in the substantially central portion in the longitudinal direction. Fig.14 The left side) is inserted into the rear end of the front pen shaft 3, and the nib component 6 inserted into the front end of the front pen shaft 3 is aligned in the axial rotation direction.

[0098] For this purpose, a relatively wide alignment opening 5b is formed in the front end of the coupling 5 in the form of a partial groove on the side of the cylindrical body. The convex portion 6d of the pen head member 6 mounted on the front end of the front pen barrel 3 enters the alignment opening 5b to align the pen head member 6 and the coupling 5 in the axial rotation direction.

[0099] A cylindrical portion 5c is formed between the wide positioning opening 5b of the coupling 5 and the large diameter portion 5a, and a narrow slit 5d is formed in a part of the cylindrical portion 5c so as to be connected to the wide positioning opening 5b.

[0100] A fitting sleeve 22 (see FIG. 2 ) formed into a cylindrical shape using a thin-walled metal or other material is mounted on the cylindrical portion 5c. Figure 4 , Figure 7 ),like Figure 4 As shown, the rear end of the front pen barrel 3 constituting the front pen barrel unit U1 is loosely fitted with the help of the fitting sleeve 22.

[0101] Therefore, the fitting sleeve 22 is easily damaged and needs to be replaced. Therefore, the slit 5d formed in the cylindrical portion 5c is provided to facilitate the reduction of the outer diameter of the cylindrical portion 5c when the fitting sleeve 22 is replaced.

[0102] The rear half of the coupling 5 is provided with a fitting portion 5e for the rear pen holder 4, and its outer surface is formed into a regular hexagonal column shape. The coupling 5 is installed at the front end of the rear pen holder 4 by inserting and fitting the fitting portion 5e into the front end opening of the rear pen holder 4 formed into a regular hexagonal cylinder shape.

[0103] When fitting the coupling 5 to the rear barrel 4 , it is necessary to fit the coupling 5 after aligning the coupling 5 so that the alignment opening 5 b formed in the coupling 5 is located on the opposite side of the clip 8 previously attached to the rear barrel 4 .

[0104] By performing the above-mentioned alignment, the coupling 5 is installed on the rear pen shaft 4, so that the convex portion 6d of the pen tip component 6 installed on the front end of the front pen shaft 3 enters the alignment opening 5b formed on the coupling 5, thereby enabling alignment between the pen tip component 6 and the coupling 5 in the axial rotation direction.

[0105] like Figure 4 As shown, this alignment is also performed when the front pen shaft unit U1 is installed to the rear pen shaft unit U2, thereby enabling the ballpoint pen tip 9a of the ballpoint pen refill 9 selected as the writing part to protrude from the opening hole 6a formed in the pen tip member 6 at a position eccentric from the axial center line of the pen shaft while maintaining a straight state.

[0106] As described above, when the coupling 5 is mounted to the rear pen barrel 4, the guide tube 11 accommodated in the rear pen barrel 4 is pushed by the coupling 5, and the groove 11d and the fitting portion 11e formed in the rod body 11c protrude at the rear portion of the rear pen barrel 4. The knob 7 is mounted on the rear end portion of the rear pen barrel 4 using the groove 11d and the fitting portion 11e formed in the rod body 11c.

[0107] Fig.15 The single-piece structure of the knob 7 is shown. The knob 7 is formed with a handle portion 7a whose outer diameter decreases toward the rear end, and at the rear end, three locations along the circumferential direction are formed with colored recessed portions, i.e., marking recessed portions 7b. The marking recessed portions 7b are preferably painted with colors corresponding to the ink colors (e.g., red, green, and black) of the ballpoint pen refill 9 mounted on the rotary delivery writing instrument 1.

[0108] A mounting hole 7c whose inner diameter is narrowed in a stepped manner is formed on the axis of the knob 7. A fitting portion 7d whose inner diameter is concave-convex along the axial direction and a rib 7e protruding along the axial direction are formed at the deepest part of the mounting hole 7c.

[0109] The knob 7 is mounted by pressing the mounting hole 7 c thereof into the rod body 11 c protruding from the rear portion of the rear pen barrel 4 of the guide tube 11 .

[0110] At this time, it is preferable to install an O-ring 18 (see Figure 2 , Figure 7 ), a ball 19 is inserted into the mounting hole 7c of the knob 7 (refer to Figure 2 , Figure 7 ).

[0111] Then, the knob 7 is pressed toward the rod body 11c in such a state that the rib 7e formed on the mounting hole 7c of the knob 7 is aligned with the groove 11d formed on the rod body 11c of the guide tube 11. By this pressing operation, the concavo-convex fitting part 7d of the knob 7 is fitted with the concavo-convex fitting part 11e on the rod body 11c side and connected.

[0112] Thus, the guide tube 11 in the rear pen body 4 can be rotated in accordance with the rotation operation of the knob 7 .

[0113] In addition, since the rib 7e implemented in the mounting hole 7c of the knob 7 is installed in a manner aligned with the groove 11d of the rod body 11c, a connection can be established in a manner in which the front end writing portion 9a of the ink color corresponding to the marking recess 7d located on the pen clip 8 side protrudes from the opening hole 6a of the pen tip member 6.

[0114] According to the rotary delivery writing tool constructed as described above, the guide tube 11 in the pen barrel 2 rotates by the rotation operation of the knob 7, and the slide block 12 moves forward along the cam slope 15b of the cylindrical cam 15 fixed in the pen barrel 2 with the rotation of the guide tube 11. As a result, the writing element 9 connected to the slide block 12 moves forward, and the front end writing part 9a protrudes from the opening hole 6a of the pen head member 6, thereby becoming a state in which writing can be performed.

[0115] With further rotation of the knob 7, the writing element 9 is moved back by the force of the spring 13, and the newly selected adjacent writing element 9 is moved forward in the same manner as described above, and the writing state is repeated.

[0116] In this case, the opening hole 6a of the pen tip member 6 is formed at a position eccentric from the axial center line of the pen barrel 2, so that the writing element 9 with the front end writing portion 9a protruding from the opening hole 6a can maintain a substantially straight state (straight state) in the pen barrel 2. Therefore, the problem of poor aesthetics of the conventional rotary delivery writing tool in which the front end writing portion 9a protrudes in a bent posture relative to the axis of the pen barrel can be solved.

[0117] In addition, the cylindrical cam 15 that makes the front end writing portion 9a of the writing element 9 protrude is implemented with a pair of left and right cam slopes 15b formed in a manner that becomes a tapered shape toward the front, so that the front end writing portion 9a can be extended and retracted regardless of which direction the knob 7 is rotated in.

[0118] Thus, for this type of rotary-feed writing tool that accommodates three or more writing elements 9 in the pen barrel, a rotary-feed writing tool that has the effects described in the effect section of the invention, such as being able to quickly select the required writing element, is provided.

[0119] In addition, the axial rotation direction alignment mechanism formed between the coupling 5 side and the pen tip member 6 side in the above-mentioned embodiment has an alignment opening 5b formed on the coupling 5 side, and a convex portion 6d inserted into the alignment opening 5b formed on the pen tip member 6 side.

[0120] However, by exchanging the positioning opening 5b and the convex portion 6d, a positioning mechanism having the same effect can be realized by implementing a mechanism corresponding to the positioning opening 5b on the pen tip member 6 side and a mechanism corresponding to the convex portion 6d on the coupling 5 side.

Claims

1. A rotary delivery writing tool, wherein a plurality of writing elements are accommodated in a pen barrel, each writing element is supported by a guide tube so as to be movable in the axial direction of the pen barrel, and a cylindrical cam fixed in the pen barrel receives a relative rotation operation of the guide tube relative to the pen barrel, so as to selectively make the front end writing portion of one of the writing elements protrude from an opening hole of a pen head member provided in the pen barrel, characterized in that: By forming the opening hole of the pen tip member at a position eccentric from the axial center line of the pen shaft, the writing element is maintained in a straight line state when the front writing portion protrudes from the opening hole. The pen holder includes a front pen holder and a rear pen holder, the pen head component is installed at the front end of the front pen holder, and the rear pen holder is connected to the front pen holder by means of a coupling, thereby forming the pen holder. A positioning opening is formed in the axial direction on one of the pen tip member and the coupling, and a convex portion inserted into the positioning opening is formed in the axial direction on the other of the pen tip member and the coupling. In the front pen holder, the convex portion is inserted into the alignment opening, so that an alignment mechanism in the axial rotation direction is formed between the pen head component and the coupling. The pen tip member is obliquely provided with an abutment portion abutting against the oblique cutting portion of the front pen barrel, and the rear half of the pen tip member bounded by the oblique abutment portion is accommodated and installed in the front pen barrel.

2. The rotary delivery writing tool according to claim 1, characterized in that: A sliding block is connected to the rear end of each writing element, which is in sliding contact with the cylindrical cam to move the writing element in the axial direction of the pen shaft. The cylindrical cam fixed in the pen body has: a cam flat portion formed in an arc shape along the circumferential direction, a pair of left and right cam inclined surfaces formed in a manner of tapering forward from both ends of the cam flat portion, and a cam top portion of a predetermined width connecting the front ends of the pair of cam inclined surfaces. The sliding block connected to the writing element abuts against the top of the cam, so that the front end writing part of the writing element protrudes from the opening hole of the pen head component. In this state, the sliding block connected to other writing elements is located on the flat part of the cam.

3. The rotary delivery writing tool according to claim 1 or 2, characterized in that: The cross-sectional shape of the pen tip member perpendicular to the axial direction of the pen body is a non-circular shape.

4. The rotary delivery writing tool according to claim 1 or 2, characterized in that: A ballpoint pen tip is used as the front end writing portion, and the ballpoint pen tip is provided with a neck portion whose outer diameter gradually decreases in a concave shape from a portion with the largest outer diameter toward the front end.

5. The rotary delivery writing tool according to claim 1 or 2, characterized in that: At least one of the writing elements is an input pen capable of operating a screen of an electronic device terminal.

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