Color-switching writing instrument with grip

Abstract

To provide a writing instrument with a color display switchable grip that allows a user to select the color visible through a window of a grip tube by rotating the grip tube provided on the writing instrument, and does not change even when subjected to vibrations or shocks.SOLUTION: A grip tube 4 is rotatably fitted to a tip portion 3 of a barrel 1 of a writing instrument. A plurality of identification marks 15 with different identifications such as colors are formed along a circumferential direction at the tip portion of the barrel. A window 16 is formed in the grip tube 4 so that the identification marks 15 can be visually recognized. A lock groove 18 is provided at a rear end of the grip tube 4, and a lock pawl 17 is retractably provided on the barrel so as to engage with the lock groove 18. When the grip tube is rotated to a position where the selected color is visible through the window 16, the lock pawl 17 engages with the lock groove 18 of the grip tube to hold the grip tube 4 in that position.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a writing instrument such as a mechanical pencil or a ballpoint pen, and a color display switching type writing instrument with a grip provided with a grip on a gripping portion, which can switch a color display by rotating the grip. tube

Background Art

[0002] In a writing instrument with a grip, for example, in a ballpoint pen, many are configured to be able to identify by displaying part or all of the barrel body, grip, knock member, etc. in the same color as the ink color of the refill stored in the barrel. On the other hand, when a user thinks that "the body is good in black, but the grip is good in red" or "I want to customize with my original color combination", it is necessary to purchase two ballpoint pens of different colors of the same model, disassemble them, change them to the desired color combination, and assemble them again into one. In such a case, the remaining one becomes wasted, resulting in an economically loss situation. Writing instruments have also been proposed in which a plurality of annular members having different patterns, figures, etc. are formed so as to be replaced with a color scheme according to the user's preference, and the combination of the annular members is changed and attached to the barrel (see, for example, Patent Documents 1 and 2). However, in order to configure to make a plurality of annular members and appropriately combine them, the number of parts increases, the configuration becomes complicated, and it cannot be economically obtained. Moreover, it is troublesome to change the combination, it cannot be easily changed, and there is also a possibility that the combined state fluctuates.

[0003] ​A writing instrument has been proposed in which the grip on the barrel has a double structure consisting of an outer grip and an inner grip, and the surface color of the grip can be seen by rotating the inner grip through a through hole formed on the side of the inner grip (see, for example, Patent Document 3). However, with this writing instrument, the outer grip must be removed and disassembled in order to rotate the inner grip, which is troublesome to handle, and if the position of the surface color and the position of the through hole in the inner grip do not match precisely, it will not be visible, and there is a risk that the inner grip may rotate due to vibrations and shocks during use, causing the position of the through hole and the surface color to become misaligned. [Prior art documents] [Patent Documents]

[0004] [Patent Document 1] Utility Model Registration No. 3008909 (paragraphs 0006, 0008, 0011, 0014, drawings) [Patent Document 2] Utility Model Registration No. 3100918 (Claim 1, paragraphs 0009, 0011, 0015, Figures 1-3) [Patent Document 3] Japanese Patent Publication No. 2008-230180 (Claim 1, Claim 3, Paragraphs 0007, 0010, Figures 2-4) [Overview of the project] [Problems that the invention aims to solve]

[0005] The problem to be solved by this invention is to provide a grip that can be adjusted according to the user's preference. tube The objective is to provide a writing instrument with a color-switching grip that allows users to easily switch and customize the colors displayed in the window, and that remains stable even when subjected to vibration or shock after the color change. [Means for solving the problem]

[0006] According to the present invention, multiple identification marks with different colors, patterns, letters, or other distinguishing features are arranged in parallel on the circumferential direction of the tip of the shaft that holds the grip cylinder, the grip cylinder is rotatably fitted onto the shaft to cover the identification marks, a window is provided in the grip cylinder so that a part of the identification marks is visible, and a locking means is provided between the grip cylinder and the shaft cylinder to lock the grip cylinder and the shaft cylinder so that they can move toward and away from each other. display A writing instrument with a switchable grip is provided, solving the above problem.

[0007] The above-mentioned locking means is a locking claw and a locking groove into which the locking claw engages, the locking claw is provided on the barrel side or the grip barrel side, the locking groove is provided on the grip barrel side or the barrel barrel side, and the locking claw and / or locking groove are provided to be movable in the longitudinal direction of the barrel, thereby providing a writing instrument with a color-changing grip. [Effects of the Invention]

[0008] The present invention is configured as described above, with multiple identification marks of different colors, patterns, characters, etc., arranged in parallel around the circumferential direction of the tip of the barrel that holds the grip cylinder, the grip cylinder being rotatably fitted onto the barrel to cover the identification marks, a window provided in the grip cylinder so that a part of the identification marks is visible, and a locking mechanism provided between the grip cylinder and the barrel to lock the grip cylinder and the barrel so that they can move toward and away from each other. Therefore, when the lock between the grip cylinder and the barrel is released, the grip cylinder can be rotated, and the identification of colors, etc., that appears in the window can be changed to a preferred identification. When the grip cylinder is stopped in the rotated position, the grip cylinder is locked, so the grip cylinder will not rotate even if vibration or shock is applied to the writing instrument. Therefore, the position of the window on the grip cylinder and the position of the identification of colors, etc. do not change, and the customized state can be maintained. Furthermore, if the locking mechanism consists of a locking claw and a locking groove that engages with the locking claw, and the locking claw is provided on the shaft side or the grip side, and the locking groove is provided on the grip side or the shaft side, and the locking claw and / or locking groove are made movable in the longitudinal direction of the shaft, then the lock can be easily released and the grip cylinder can be rotated by moving the locking claw or locking groove in the longitudinal direction of the shaft, and then it can be easily locked by returning it to the opposite direction in the longitudinal direction. [Brief explanation of the drawing]

[0009] [Figure 1] A front view showing one embodiment of the writing instrument of the present invention. [Figure 2] Enlarged cross-sectional view. [Figure 3] The shaft is shown as follows: (A) is a plan view, (B) is a front view, (C) is a cross-sectional view, and (D) is a side view. [Figure 4] The grip cylinder is shown, with (A) being a plan view, (B) a front view, and (C) a cross-sectional view. [Figure 5] The locking piece of the locking mechanism is shown, with (A) being a plan view, (B) a front view, (C) a cross-sectional view, and (D) a side view. [Figure 6]An embodiment using the locking piece shown in FIG. 5 is shown. (A) is a plan view, (B) is an explanatory view of the state where the grip cylinder is rotating, and (C) is an explanatory view of the state where the grip cylinder is rotated 90 degrees. [Figure 7] Another embodiment of the locking means is shown. (A) is a plan view, (B) is an explanatory view of the state where the tapered member is loosened and the grip cylinder is rotated, and (C) is an explanatory view after the grip cylinder is rotated 90 degrees. [Figure 8] The relationship between the grip cylinder, the identification mark, the locking groove, and the locking claw is shown. (A) is a developed view of the grip cylinder, (B) is a developed view of the identification mark, (C) is a developed view of the grip when the grip cylinder is in a fixed position, and (D) is a developed view of the grip when the grip cylinder is in a rotational position rotated 90 degrees from the fixed position. [Figure 9] Another embodiment of the grip cylinder is shown. (A) to (D) are partial explanatory views respectively. [Figure 10] The colored piece is shown. (A) is a plan view, (B) is a cross-sectional view, and (C) is a side view. [Figure 11] The shaft cylinder is shown. (A) is a plan view and (B) is a half cross-sectional view. [[ID=十七]] [Figure 12] The grip cylinder is shown. (A) is a plan view, (B) is a half cross-sectional view, (C) is a right side view, and (D) is a left side view. [Figure 13] Enlarged cross-sectional view. [Figure 14] Front view. [Figure 15] The locking colored piece is shown. (A) is a plan view, (B) is a front view, (C) is a cross-sectional view, and (D) is a side view. [Figure 16] The shaft cylinder is shown. (A) is a plan view and (B) is a half cross-sectional view. [Figure 17] The grip cylinder is shown. (A) is a plan view, (B) is a cross-sectional view, (C) is a right side view, and (D) is a left side view. [Figure 18] Enlarged cross-sectional view. [Figure 19] Front view.

Mode for Carrying Out the Invention

[0010] Figs. 1 and 2 show an embodiment of the present invention. As a writing implement, a ballpoint pen with a ballpoint refill 2 housed in a shaft cylinder 1 is shown. However, it may be a writing implement that houses other writing implements such as a mechanical pencil or a marker pen in the shaft cylinder, or an appropriate cosmetic tool. A grip cylinder 4 is rotatably fitted to the front portion 3 of the shaft cylinder. , a grip is formed As shown in Fig. 3, the grip cylinder 4 is inserted from the front end side of the shaft cylinder 1 until the rear end abuts against a stepped portion 5 formed on the shaft cylinder 1. Further, by screwing a tapered member 6 or the like to the front end side thereof, it is held in a sandwiched state between the stepped portion 5 and the tapered member 6. In the embodiment shown in Fig. 2, the above ballpoint refill 2 is urged rearward of the shaft cylinder 1 by a knock spring 7, and by a known rotary feeding mechanism such as a knock cap 8, a knock cam 9, and a rotor 10 protruding from the rear end of the shaft cylinder, by pressing the knock cap 8, the tip can protrude from the tip opening 11 of the tapered member 6 and can be used for writing.

[0011] As shown in Fig. 3, the front portion 3 of the shaft cylinder 1 is formed with a small diameter, the grip cylinder 4 is fitted to the small diameter portion, a stepped portion 5 is formed at the rear end of the small diameter portion so that the rear end of the grip cylinder 4 abuts thereon, and a screw portion 12 for screwing the tapered member 6 is provided on the front end side. Further, a through hole 13 that opens in the longitudinal direction of the shaft cylinder 1 is formed in the side wall of the stepped portion, and a guide groove 14 that extends in the longitudinal direction is formed on the inner surface of the shaft cylinder 1.

[0012] Multiple identification marks 15, each with a different color, pattern, lettering, or other distinguishing feature, are arranged in parallel in the circumferential direction on the surface of the tip 3 between the stepped portion 5 and the threaded portion 12. The identification marks 15 are formed by appropriate means such as printing, sealing, or tape, and extend along the entire longitudinal direction of the tip 3 of the shaft 1, but can be configured as appropriate. For example, identification marks of different lengths in the longitudinal direction may be combined with appropriate differences, provided intermittently, or inclined at an angle. The identification marks 15 are preferably arranged in sections with different colors, etc., in the circumferential direction. In the embodiment shown in Figure 3, as shown in the unfolded view in Figure 8(B), color A and color B appear alternately every 30 degrees. Other arrangement configurations include, for example, dividing the entire circumference into multiple sections and displaying that all sections have different colors, etc., or dividing it into several sections and displaying that the identification colors, etc., appear repeatedly, or freely configuring a variety of appropriate color schemes.

[0013] As shown in Figure 4, the grip cylinder 4 has a plurality of windows 16 arranged in the longitudinal direction at positions corresponding to the identification marks 15. In this embodiment, the windows 16 are also provided in parallel in the circumferential direction, and in the circumferential arrangement, as shown in the embodiment shown in the figure, the windows 16 are spaced at 60-degree intervals, as shown in the unfolded view of Figure 8(A). Longitudinal row Center line 19The window portion 16 is formed so that it is located in a specific position. The window portion 16 can be made into a transparent, closed window portion by constructing the grip cylinder 4 from a plastic material, or, as in the embodiment shown in Figure 4, it can be made from a metal material and formed into an opening cut out of the wall surface of the grip cylinder. In the embodiments shown in Figure 1 and other figures, the window portion 16 is formed in a rectangular shape, but it can be provided in any shape as desired. For example, it can be made into a circular shape as shown in Figure 9(A), a triangular shape as shown in Figure 9(B), a rectangular shape in the longitudinal direction as shown in Figure 9(C), or any other appropriate shape. In addition, as shown in Figure 9(D), instead of arranging them in parallel in the circumferential direction, one rectangular window portion 16 can be formed in the longitudinal direction, and the outer circumference of the grip cylinder 4 excluding the window portion can be closed. With this configuration, by providing multiple identification marks with different colors in all the sections around the shaft cylinder 1, all the colors can be displayed one by one in the window portion each time the grip rotates to a position corresponding to the section.

[0014] Between the grip cylinder 4 and the shaft cylinder 1, a locking mechanism is provided to lock the movement of the grip cylinder 4 when it is rotated. The locking mechanism can be configured as appropriate, preferably including a locking claw 17 and a locking groove 18 that engages with the locking claw 17, but other locking mechanisms can also be provided. In the embodiment shown in Figures 1 and 2, a plurality of locking grooves 18 are provided on the grip cylinder 4 side, and a locking claw 17 is provided on the shaft cylinder 1 side. The locking grooves 18 open in a substantially V-shape towards the rear at the rear end of the grip cylinder 4, and the spacing of the locking grooves 18 is provided according to the rotation position at which the grip cylinder is to be locked. In the embodiment shown in the figures, in order to lock the grip cylinder 4 every 90 degrees, as shown in the exploded view of Figure 8(A), the inner tip of the locking groove 18 is located on the center line 19 of the longitudinal row of the window portion 16, and when the grip cylinder rotates 90 degrees from that position, the inner tip of the locking groove 18 is located on the middle line 20 of the longitudinal row of the window portion.

[0015] As shown in Figure 5, the locking claw 17 is formed in a mountain shape at the front end of the locking piece 21. The locking piece 21 has an alignment projection 22 on its circumferential surface and is housed so as to move forward and backward in the longitudinal direction with the projection 22 slidably engaged with the guide groove 14 provided inside the shaft cylinder 1. As shown in Figure 2, a locking spring 24 is provided between the rear of the locking piece 21 and the receiving portion 23 provided inside the shaft cylinder 1, biasing the locking piece 21 so that the tip of the locking claw 17 protrudes forward from the through hole 13 provided in the stepped portion 5 of the shaft cylinder 1, thereby causing the locking claw 17 to elastically contact the rear end of the grip cylinder 4.

[0016] Referring to Figure 6, as shown in Figure (A), when the grip cylinder 4 is in a fixed position, the locking claw 17 is engaged with the locking groove 18. However, when the grip cylinder 4 is rotated forcefully, as shown in Figure (B), the side surface of the roughly V-shaped locking groove 18 presses against the side surface of the roughly mountain-shaped locking claw 17, causing the locking piece 21 forming the locking claw 17 to be pushed back against the locking spring 24. As a result, the locking claw 17 disengages from the locking groove 18, allowing the grip cylinder 4 with the locking groove 18 to rotate. When the grip cylinder 4 rotates to a position where the next adjacent locking groove 18 corresponds to the locking claw 17, as shown in Figure (C), the locking claw 17 protrudes due to the locking spring 24 and engages with the locking groove 18, holding the grip cylinder 4 in that position. In this embodiment, the lock groove 18 is provided on the grip cylinder 4 side and the lock claw 17 is provided on the shaft cylinder side (lock piece 21), but the lock claw may be provided on the grip cylinder side and the lock groove on the shaft cylinder side (lock piece). When the lock claw rotates, it is preferable to form an appropriate guide surface or the like on the outer surface of the member constituting the lock groove to guide the lock claw into the lock groove (not shown).

[0017] Figure 7 shows another embodiment of the locking mechanism. In this embodiment, a substantially circular locking claw 25 is provided projecting toward the grip cylinder 4 from the side wall of the stepped portion 5 of the shaft cylinder 1, and a substantially arc-shaped locking groove 26 is provided at the rear end of the grip cylinder 4 so as to engage with the locking claw 25. The tapered member 6 is preferably provided to be removable from the shaft cylinder 1. In this embodiment, instead of providing a movable member such as the locking piece 21 on the shaft cylinder side, the grip cylinder 4 itself is provided to be movable in the longitudinal direction. According to this embodiment, as shown in Figure (A), the grip cylinder 4 can be held in a fixed position by engaging the locking groove 26 of the grip cylinder 4 with the locking claw 25 of the shaft cylinder 1. As shown in Figure (B), if the tapered member 6 is loosened and the grip cylinder 4 is moved forward in the longitudinal direction to the extent that the locking claw 25 on the shaft cylinder side comes out of the locking groove 26, the arc-shaped outer surface of the locking claw slides out of the arc-shaped inner surface of the locking groove 26, and the grip cylinder 4 can be rotated. When the desired identification mark 15 appears through the window 16, the grip cylinder 4 can be returned to its rearward position as shown in Figure (C) to engage the locking groove 26 and the locking claw 25, thereby locking the grip cylinder 4. For illustrative purposes, Figure 7(B) shows the tapered member removed from the shaft cylinder, but it is not necessary to remove the tapered member if the grip cylinder can rotate. Alternatively, the locking claw can be provided on the grip cylinder side and the locking groove on the shaft cylinder side, or a series of saw-tooth-like, continuously bending protrusions can be provided as the locking claw and locking groove to serve as the locking mechanism.

[0018] As described above, the longitudinal rows of the window portion 16 of the grip cylinder 4 are arranged such that the centerlines 19 of the longitudinal rows are positioned at 60-degree intervals, as shown in the unfolded view of Figure 8(A). The identification marks 15 are displayed with colors A and B repeated every 30 degrees, as shown in the unfolded view of Figure 8(B). Lock grooves 18 are provided on the rear end surface of the grip cylinder at 90-degree intervals. As shown in Figure 8(C), if we consider the position where the lock claw 17 is located along the centerline 19 of the longitudinal row of the central window portion 16 as the fixed position, then color A is visible from the window portion 16 of the grip cylinder 4. This state is shown in Figures 6(A) and 7(A). When the grip cylinder is rotated 90 degrees from this state, it reaches the rotation position shown in the unfolded view of Figure 8(D), and the lock claw 17 engages with the lock groove 18 located on the intermediate line 20 between the longitudinal sections of the window portion 16, locking the rotation of the grip cylinder 4. At this time, color B can be seen through the window 16 of the grip cylinder 4, as shown in Figures 6(C) and 7(C). In this way, by rotating the grip cylinder 4 by 90 degrees, the color displayed in the window 16 can be changed, and by appropriately setting the position of the identification mark 15 and the window 16 of the grip cylinder 4, the color can be changed and customized one after another. When the selected color is displayed, the grip cylinder 4 is locked by the locking mechanism, so it will not change even if vibration or shock is applied. In the above embodiment, the grip cylinder is configured to lock every 90 degrees of rotation, but this rotation angle can be appropriately set to, for example, 45 degrees, 60 degrees, etc., and the identification mark and grip can be changed according to the rotation angle. tube The arrangement of the window, lock groove, lock claw, etc., can be selected. In addition, the above identification marks can display the lead hardness and lead diameter of the mechanical pencil, or personal names, initials, or other names can be engraved and made visible through the window on the grip barrel.

[0019] In the above embodiment, identification marks are directly applied to the surface of the tip of the barrel by printing, stickers, tape, etc. However, a separate component with identification marks on its outer surface may be formed and incorporated into the barrel. As an example of such a component, as shown in Figure 10, a cylindrical component having an inner diameter and outer diameter that can be fitted between the grip tube and the tip of the barrel can be prepared, and identification marks arranged in a parallel direction in the circumferential direction on the outer surface of this component by printing, stickers, masking tape, etc. can be formed to create a colored component 27. By forming a separate colored component 27 from the barrel in this way and applying the identification marks 15 to the colored component 27, productivity is improved and cost-effective compared to directly applying the identification marks 15 to the barrel 1, and the buyer of the writing instrument can easily apply their preferred masking tape, etc., resulting in a more customized writing instrument.

[0020] The color piece 27 can be incorporated in any configuration as appropriate. Figures 11 to 14 show one such embodiment, in which a stepped portion 5 leading to the small-diameter tip portion 3 of the shaft 1 has a through hole 13 through which the locking claw 17 of the lock piece 21, which is housed in the shaft 1 so as to be movable in the longitudinal direction, is inserted, substantially the same as in the above embodiment, and a guide groove 14 is provided on the inner surface behind the stepped portion 5, into which an alignment projection 22 fits to prevent the lock piece 21 from rotating. The outer surface of the tip portion 3 is provided with a rotation-preventing groove 28 whose tip opens forward, and a rib 29 (see Figure 10) provided on the inner surface of the color piece 27 engages with the rotation-preventing groove 28, so that the color piece 27 is inserted in a rotation-preventing state. As shown in Figure 12, the grip 4 has a plurality of windows 16 arranged in the longitudinal direction, similar to the above embodiment, and a shoulder portion 30 is provided so as to sandwich the front and rear ends of the color piece 27 located inside between itself and the tapered member 6, and a plurality of locking grooves 18 are provided at the rear end.

[0021] Referring to Figure 13, the tip of the lock spring 24 abuts against the rear end of the lock piece 21, as in the above embodiment, and the rear end of the lock spring 24 abuts against the tip of the clip inner cylinder 31 inserted into the shaft cylinder. As a result, the lock piece 21 is biased forward, and the lock claw 17 elastically contacts the rear end of the grip cylinder 4. Therefore, as in the above embodiment, when the grip cylinder 4, which is sandwiched between the tapered member 6 and the stepped portion 5, is rotated, the color piece 27 does not rotate, but the lock groove 18 rotates while pushing the lock piece 21, which has the lock claw 17 formed on it, backward against the lock spring 24. When the next lock groove 18 faces the lock claw 17, the lock spring 24 moves the lock piece 21 forward, and the lock groove 18 and the lock claw 17 engage, allowing the grip cylinder 4 to be locked at the position where the identification mark 15, such as the color of the color piece 27, visible from the window portion 16, has changed.

[0022] In the embodiment shown in Figure 13 and other figures, a separate locking piece 21 is provided, but it is also possible to use a locking color piece 32 that has the function of a locking piece without providing a separate locking piece. In this embodiment, as shown in Figure 15, the locking color piece 32 is provided with a locking claw 17 at its front end and ribs on its inner surface. 29 And the rib is formed. 29 The locking color piece 32 is fitted into a rotation-preventing groove 28 formed in the front end 3 of the shaft cylinder 1 so as to be movable in the longitudinal direction, and a locking spring 24 (see Figure 18) is installed between the stepped portion 5 of the shaft cylinder 1 and the rear end of the locking color piece 32 to bias the locking color piece 32 forward.

[0023] The grip cylinder 4 is formed with an inner diameter that can accommodate the lock color piece 32, and as shown in Figure 17, an inward projection 33 is provided at its front so as to contact the front end of the lock color piece 32, and a plurality of lock grooves 18 are formed in the inward projection 33 so as to engage with the lock claw 17.Therefore, as in the above embodiment, when the grip cylinder 4, which is sandwiched between the tapered member 6 and the stepped portion 5, is rotated, the lock color piece 32 does not rotate, but the lock grooves 18 rotate while pushing the lock color piece 32, which has the lock claw 17 formed on it, backward against the lock spring 24, and when the next lock groove 18 corresponds to the lock claw 17, the lock spring 24 moves the lock color piece 32 forward and engages, so the position of the lock groove 18 changes, and the grip cylinder 4 can be locked at a position in which the identification mark 15 such as the color of the lock color piece 32, which can be seen from the window portion 16, has changed. [Explanation of symbols]

[0024] 1 shaft cylinder 4 Grip Tubes 5 steps 6 Tapered member 13 Through hole 15 Identification Marks 16 Window section 17 Locking claws 18 lock grooves 21 Lock Piece 24 Lock spring 25 Locking claws 26 lock grooves 27 colored pieces 32 Lock Color Pieces

Claims

1. Multiple identification marks, differing in color, pattern, letters, or other distinguishing features, are arranged in parallel along the circumferential direction of the tip portion formed on the small diameter of the shaft that holds the grip barrel. The grip cylinder, held between the stepped portion at the position where the small-diameter tip portion is formed in the above-mentioned shaft cylinder and the tapered member positioned on the tip side of the above-mentioned shaft cylinder, is fitted to the above-mentioned shaft cylinder so as to be circumferentially rotatable, covering the identification mark, and a window portion is provided in the grip cylinder so that a part of the identification mark is visible, A locking mechanism is provided between the grip cylinder and the shaft cylinder to lock the rotation of the grip cylinder in the circumferential direction. The above-mentioned locking mechanism consists of a locking claw and a locking groove into which the locking claw engages. The locking claw is provided on the barrel side or the grip barrel side, and the locking groove is provided on the grip barrel side or the barrel side. The locking claw or locking groove provided on the shaft side is provided on the front end of a locking piece that is arranged inside the shaft so as to be movable in the axial direction of the shaft. The above-mentioned locking piece is always biased toward the tip by a locking spring. A writing instrument with a grip and switchable color display.

2. A color-switching grip writing instrument according to claim 1, wherein a cylindrical color piece is fitted between the grip tube and the tip of the barrel tube, and the identification mark is provided around the color piece.

3. In a barrel having a small diameter tip, the grip barrel is held by the tip so as to be rotatable in the circumferential direction of the barrel between a stepped portion at the position where the small diameter tip is formed and a tapered member disposed on the tip side of the barrel, A locking color piece, which is cylindrical and has multiple identification marks of different colors, patterns, letters, or other distinguishing features arranged in a circumferential direction around its circumference, is mounted between the grip cylinder and the tip of the cylinder so as to be movable in the axial direction of the cylinder but not in the circumferential direction of the cylinder. The grip cylinder described above covers the identification mark and has a window portion that allows a part of the identification mark to be visible. A locking mechanism is provided between the grip cylinder and the locking color piece to lock the rotation of the grip cylinder in the circumferential direction. The above-mentioned locking mechanism consists of a locking claw and a locking groove into which the locking claw engages. The locking claw is provided at the front end of the locking color piece. The front of the grip cylinder has an inward projection radially inward against which the front end of the locking color piece abuts, and multiple locking grooves are formed in the circumferential direction on this inward projection. The above-mentioned locking color piece is constantly biased toward the front by the locking color piece spring. A writing instrument with a grip and switchable color display.

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