Notepad

Abstract

To improve operability.SOLUTION: The writing instrument includes: a barrel 10; a mechanical pencil inner core 20 which is provided in the barrel 10 and feeds a stored lead core x forward; a lead core supply path opening / closing member 70 provided to open and close a lead core supply path 51e to the mechanical pencil inner core 20; and an opening / closing operation body 80 sliding in a front-rear direction on an outer peripheral side of the barrel 10. In conjunction with the sliding of the opening / closing operation body 80, the lead core supply path opening / closing member 70 is opened / closed.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present invention relates to a writing instrument equipped with a core for a mechanical pencil. [Background technology]

[0002] Conventionally, as described in Patent Document 1, for example, this type of writing instrument includes a barrel, a mechanical pencil writing body that advances the stored lead forward, a knock bar that is attached to the outer periphery of the barrel and can be slid back and forth, and a cover member that is rotatably attached to the rear end of the knock bar, and the lead refill path to the mechanical pencil writing body is opened and closed by rotating the cover member. According to this writing instrument, since it does not have a cap or the like that is attached and detached to open and close the lead refill passage, there is no need to worry about losing the cap or the like. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2012-111040 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, according to the above-mentioned conventional technology, since the cover member is rotated in the same front-rear position, it is difficult to visually check whether the cover member is in the open or closed state. Therefore, there is a risk that the scribe or the like will not notice that the cover member is in the open state and will point the rear end side of the barrel downward, causing the lead core to fall out unintentionally. [Means for solving the problem]

[0005] In view of these problems, the present invention One of The present invention has the following configuration. A shaft cylinder, a lead core for a mechanical pencil provided in the shaft cylinder and adapted to advance the lead core housed therein forward, and a lead core supply path for the lead core for the mechanical pencil. In the direction of the shaft diameter This writing instrument is characterized in that it is equipped with a lead lead supply path opening / closing member that is configured to be opened and closed, and an opening / closing operating body that slides in the forward and backward directions on the outer periphery of the barrel, and the lead lead supply path opening / closing member is opened and closed in conjunction with the sliding of the opening / closing operating body. Effect of the Invention

[0006] Since the present invention is configured as described above, the open / closed state of the lead core supply passage can be easily grasped, and operability is excellent. [Brief description of the drawings]

[0007] [Figure 1] 1 is a full cross-sectional view showing an example of a writing instrument according to the present invention. [Diagram 2] FIG. 2 is an exploded perspective view of the main part of the writing implement, showing only the clip body in a vertical cross-sectional perspective view. [Diagram 3] FIG. 4 is a perspective view of the opening / closing operation body as viewed from the bottom side. [Figure 4] 1A and 1B are diagrams illustrating the operation of the writing instrument, where (a) and (a') are a longitudinal cross-sectional view and a rear end view when the lead refill passage is closed, and (b) and (b') are a longitudinal cross-sectional view and a rear end view when the lead refill passage is open. [Diagram 5] 13(c) is a vertical cross-sectional view showing the state in which the lead supply passage has been opened and the front end of the clip has been pulled away from the outer peripheral surface of the barrel, and FIG. 13(c') is a rear end view showing the same state. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0008] This embodiment discloses the following features. The first feature is that it comprises a barrel, a mechanical pencil core that is provided within the barrel and advances the lead contained therein forward, a lead supply path opening / closing member that is provided to open and close the lead supply path to the mechanical pencil core, and an opening / closing operation body that slides in the front-to-back direction on the outer periphery of the barrel, and the lead supply path opening / closing member is opened and closed in conjunction with the sliding of the opening / closing operation body (see Figures 1 to 5).

[0009] As a second feature, one of the opening / closing operation body and the lead core supply path opening / closing member is provided with an inclined engagement portion inclined with respect to the axial direction of the barrel, and the other is provided with a sliding portion that slides in contact with the inclined engagement portion as the opening / closing operation body slides, moving in the direction of opening and closing the lead core supply path (see Figures 1 to 5).

[0010] As a third feature, the inclined engagement portion is formed in an elongated hole shape, and the sliding portion is provided so as to fit into the inclined engagement portion and slide in the extending direction of the inclined engagement portion (see Figs. 1 to 5).

[0011] A fourth feature of this writing instrument is that it comprises a lead extension / retraction operating body that is provided on the outer periphery of the barrel and can be slid back and forth, and a biasing member that biases the mechanical pencil lead rearward, and the lead for mechanical pencil is caused to protrude from the front end of the barrel by pushing the lead extension / retraction operating body forward against the biasing force of the biasing member, and the opening / closing operating body is provided on the lead extension / retraction operating body and closes the lead supply path when in a front position and opens the lead supply path when in a rear position (see Figures 1 to 5).

[0012] A fifth feature is a writing instrument comprising a core protruding and retracting operation body that is provided on the outer periphery of the barrel and can be slid in the forward and backward directions, and a biasing member that biases the core for the mechanical pencil rearward, and the core for the mechanical pencil protrudes from the front end of the barrel by pushing the core protruding and retracting operation body forward against the biasing force of the biasing member, wherein the opening / closing operation body is provided on the core protruding and retracting operation body, and the core protruding and retracting operation body comprises a clip body with an opening / closing operation function that separates the front side of the fulcrum portion from the outer periphery of the barrel by pushing the rear side of the fulcrum portion radially inward of the barrel, and the inclined engagement portion is provided with a relief portion that fits into the sliding portion when the clip body is released (see FIG. 5).

[0013] As a sixth feature, the clip body is provided with a lead core slip-out prevention portion so that when the portion rearward of the fulcrum portion is pushed radially inward in the barrel tube, it is positioned on a rear extension of the lead core supply path (see Figure 5).

[0014] <Specific embodiment> Next, specific embodiments having the above-mentioned features will be described in detail with reference to the drawings.

[0015] In this specification, the barrel axis direction means the direction along the center line of the barrel, and the barrel circumferential direction means the direction around the center line of the barrel. In addition, "front" means one side of the barrel axis direction in which the front end of the mechanical pencil core protrudes, and "rear" means the opposite side to the one side. In addition, in this specification, the radial direction of the barrel means the diameter direction of the barrel perpendicular to the center line of the barrel, the outer radial direction of the barrel means the direction away from the center of the barrel along the radial direction of the barrel, and the inner radial direction of the barrel means the direction toward the center of the barrel along the radial direction of the barrel.

[0016] Writing instrument A comprises a barrel 10, a mechanical pencil core 20 and a ballpoint pen core 30 which can be advanced and retreated within the barrel 10, a biasing member 40 which biases the mechanical pencil core 20 and the ballpoint pen core 30 backwards, core extension and retraction operating bodies 50, 60 which are provided on the outer periphery of the barrel 10 and can be slid in the front-to-rear direction, a lead supply path opening and closing member 70 which opens and closes a lead supply path 51e to the mechanical pencil core 20, and an opening and closing operating body 80 which is provided on the outer periphery of the barrel 10 and can slide in the front-to-rear direction. In this writing instrument A, the lead core 20 for the mechanical pencil or the lead core 30 for the ballpoint pen is projected from the front end of the barrel 10 by selectively pushing the lead core projection / retraction operation bodies 50, 60 forward against the biasing force of the biasing member 40. In addition, in conjunction with the sliding of the opening / closing operation body 80, the lead core supply path opening / closing member 70 is opened and closed.

[0017] The barrel 10 is formed into a long cylinder extending in the front-rear direction from one or more cylindrical members. The barrel 10 in the illustrated example includes a front barrel 11 having a tapered cylindrical tip 11a at the front end, and a rear barrel 12 that is screwed to the rear end of the front barrel 11 and extends rearward. Reference numeral 13 in the figure denotes a cylindrical elastic grip that is fitted to the outer periphery of the front barrel 11.

[0018] The rear axle 12 is formed in a cylindrical shape with a bottom that is open at the front end and a closed rear end. The peripheral wall at the rear end of the rear shaft 12 is provided with openings 12a, 12b at a predetermined interval in the circumferential direction, through which a core extension / retraction operating body 50 for the mechanical pencil core 20 and a core extension / retraction operating body 60 for the ballpoint pen core 30 can be inserted radially and slid back and forth, respectively.

[0019] In the illustrated example, one opening 12a and two openings 12b are provided according to the number of mechanical pencil cores 20 and ballpoint pen cores 30, but it is also possible to have three or more ballpoint pen cores 30 and openings 12b.

[0020] The inner surface of each opening 12a, 12b is provided with a linear guide surface (not shown) that guides the core protruding and retracting operating body 50 (or 60) in the forward and backward directions, and a stepped engaging portion (not shown) that sinks the core protruding and retracting operating body 50 (or 60) that advances along this guide surface inward in the radial direction of the shaft tube. The structures of these guide surfaces and engaged portions may be those disclosed in, for example, Japanese Patent Application Laid-Open No. 2005-111876.

[0021] A core holding member 14 is fixed to the inner peripheral surface at the front end of the rear barrel 12 so as to be immovable and imrotatable, so that the mechanical pencil core 20 and the ballpoint pen core 30 can be inserted therethrough so as to be movable forward and backward. This core holding member 14 is sometimes called a divider.

[0022] The mechanical pencil lead 20 is configured by connecting a lead feed mechanism 22 for feeding the contained lead x forward to the front end side of a cylindrical lead tank 21. The mechanical pencil core 20 is connected to the front end side of the slide body 51 in the core extension / retraction operation body 50. With the writing part 22a inserted and locked into the front end opening of the tip portion 11a, the mechanical pencil core 20 advances and retracts the lead tank 21 in response to the advance / retract operation of the core extension / retraction operation body 50, thereby advancing and retracting the lead tank 21.

[0023] The ballpoint pen core 30 is connected to the front end of the ink tank 31 filled with ink, and has a writing section 32 (ballpoint pen tip) that holds a transfer ball at its front end. The ballpoint pen core 30 is connected to the front end of the core intrusion / retraction operation body 60, and advances as the core intrusion / retraction operation body 60 advances, causing the writing section 32 to protrude from the tip 11a. It should be noted that some or all of the multiple ballpoint pen cores 30 can be replaced with cores (refills) or writing cores having functions other than those shown in the illustrated example, such as writing cores for electronic pens.

[0024] The biasing member 40 is a compression coil spring attached in an annular shape to the rear end side of the mechanical pencil core 20 and the ballpoint pen core 30, respectively. The front end of the urging member 40 is received by the center core holding member 14. The rear end of the urging member 40 is fitted into the center core extending / retracting operation body 50 or the center core extending / retracting operation body 60 in an annular shape in the front end side of the shaft cylinder.

[0025] One of the core retractable operating bodies 50 comprises a slide body 51 which fits into the opening 12a and moves back and forth, a clip body 52 which is supported by the slide body 51 and exposed outside the shaft tube, a biasing member 53 which biases the clip body 52 in the closing direction, and a lead core supply path opening / closing member 70 and an opening / closing operating body 80 which will be described later, and constitutes a clip with an opening / closing operation function in which the part behind the fulcrum part P is pushed inwardly in the shaft tube diameter, thereby separating the part ahead of the fulcrum part P from the outer circumferential surface of the shaft tube and opening it.

[0026] The slider 51 is formed so as to slide back and forth along the slot-shaped opening 12a. The sliding body 51 is integrally provided with an engaging portion 51a (see FIG. 2) that protrudes rearward so as to be engaged with an engaging portion (not shown) on the peripheral wall of the barrel 10 within the opening 12a, a support portion 51b that rotatably supports the clip body 52, a biasing member holding portion 51c that holds the biasing member 53 rearward of the support portion 51b so as to be able to expand and contract, a guide portion 51d that is provided between the support portion 51b and the biasing member holding portion 51c and guides the sliding of the lead supply path opening / closing member 70 in the radial direction of the barrel, and a lead supply path 51e for supplying lead x to the mechanical pencil core 20.

[0027] The support parts 51b are provided on both sides in the clip width direction (left and right direction in Figs. 4(a')(b') and 5(c')), and cooperate with the shaft part 52a2 of the clip body 52 to form a fulcrum part P when rotating the clip body 52. ​​Each support part 51b is formed in a concave shape that rotatably holds the shaft part 52a2 of the clip body 52. The biasing member holding portion 51c is formed in a concave shape so as to embrace and receive one end side of the biasing member 53 (a compression coil spring in the illustrated example) that resiliently biases the rear end side of the clip body 52.

[0028] The guide portion 51d is formed in the shape of a through hole (in the illustrated example, in the shape of a slit hole) that opens to the outer side in the radial direction of the barrel and communicates with a lead-core supply passage 51e (described later) on the inner side in the radial direction of the barrel.

[0029] The lead-core supply passage 51e is located radially inward of the support portion 51b and is formed in the shape of a through hole extending in the axial direction of the barrel. The front end side of this lead supply passage 51e is formed on the inner peripheral surface of a cylinder, and is fitted into the rear end portion of the mechanical pencil lead 20 in an annular shape. The rearmost end of the lead replenishing passage 51e opens rearward and functions as a lead supply port 51e1 (see FIG. 4).

[0030] Further, an opening 51e2 communicating with the above-mentioned guide portion 51d is formed in the middle of the lead-core supply path 51e in the front-rear direction.

[0031] The clip body 52 is a long member with an inverted concave cross-section extending in the front-to-rear direction along the outer peripheral surface of the shaft tube 10, and at its rear side has a through engagement portion 52a that penetrates in the radial direction of the shaft tube, a receiving portion 52b that receives the biasing member 53 rearward of the through engagement portion 52a, and a lead core slip-out prevention portion 52c. Furthermore, on the front surface side of the clip body 52, the portions on the front side and rear side of the through engagement portion 52a are each formed in a concave shape. A front engaging / disengaging protrusion 52e that engages the opening / closing operation body 80 by making it ride forward is provided on the bottom surface of the front concave portion, and a rear engaging / disengaging protrusion 52f that engages the opening / closing operation body 80 by making it ride backward is provided on the bottom surface of the rear concave portion. The front engaging / disengaging protrusion 52e and the rear engaging / disengaging protrusion 52f are each a protrusion extending in the clip width direction.

[0032] The through engagement portion 52a is formed so that the opening / closing piece portion 71 of the lead core supply path opening / closing member 70 can be inserted from the outside in the radial direction of the shaft tube, and the support portion 51b and guide portion 51d of the slide body 51 can be inserted from the inside in the radial direction of the shaft tube (see Figure 2).

[0033] The through engagement portion 52a holds the opening / closing operation body 80 so that it can slide in the front-rear direction and so that it cannot slip out radially outward in the barrel cylinder direction. More specifically, a storage space is provided inside the through-hole engagement portion 52a to allow the opening / closing operation body 80 to slide in the front-rear direction. A plurality of engaged portions 52a1 are provided on the inner surface of the through-hole engagement portion 52a to engage with the opening / closing operation body 80 so that the opening / closing operation body 80 can slide back and forth and cannot be pulled out. A shaft portion 52a2 is provided radially inward of the engaged portions 52a1.

[0034] The engaged portions 52a1 are provided on the inner surfaces of both sides of the clip body 52, respectively. The engaged portions 52a1 are provided at intervals in the front-rear direction so as to correspond to the front and rear slide protrusions 82a of the opening / closing operation body 80. Each of the engaged portions 52a1 is formed in the shape of an elongated projection protruding from the inner surface of the through-engagement portion 52a in the front-rear direction.

[0035] The shaft portions 52a2 are provided on the inner surfaces on both sides of the through engagement portion 52a so as to fit into the support portions 51b on both sides of the slide body 51, respectively. The shaft portion 52a2 and the support portion 51b function as a fulcrum portion P for rotating the clip body 52 to open and close.

[0036] The receiving portion 52b is formed in a flat surface shape so as to receive an outer end face of the urging member 53 (a compression coil spring in the illustrated example) in the radial direction of the shaft cylinder, rearward of the through engagement portion 52a.

[0037] The lead core slip-out prevention portion 52c is arranged to be located on a rear extension of the lead core supply path 51e when the portion of the clip body 52 rearward of the fulcrum portion P is pushed radially inward in the barrel (see FIG. 5). According to the illustrated example, the lead core slippage prevention portion 52c is formed by extending the flat rear end wall of the clip body 52 radially inwardly of the barrel.

[0038] The other core protruding operation body 60 is provided so as to fit into the opening 12b and move back and forth. This core protruding operation body 60 advances when an operation part 61 (see FIG. 4) protruding outward in the barrel diameter direction is pressed forward, and an engaged part (not shown) on the rear end side engages with an engaged part (not shown) on the barrel 10 peripheral wall, thereby maintaining the protruding state of the writing part 32. The structure for causing the selected mechanical pencil core 20 or ballpoint pen core 30 to protrude or retract from the front end of the barrel 10 can be that of a well-known multi-function writing instrument.

[0039] In addition, the lead core supply path opening / closing member 70 is configured to be approximately L-shaped when viewed from the side, and is integrally equipped with an opening / closing piece portion 71 extending in the radial direction of the shaft tube and an engaging piece portion 72 extending forward from the radially outer end of this opening / closing piece portion.

[0040] The opening / closing piece 71 is formed in a plate shape that fits into the guide portion 51d and is movable in the barrel radial direction. One end of the opening / closing piece 71 enters the lead supply passage 51e and closes the lead supply passage 51e as the entire lead supply passage opening / closing member 70 slides inward in the barrel radial direction. In this closed state, the tip portion of the opening / closing piece 71 prevents the lead x from moving in the lead supply passage 51e.

[0041] Moreover, the one end side of the opening / closing piece portion 71 opens the lead lead supply passage 51e as the entire lead lead supply passage opening / closing member 70 slides outward in the barrel radial direction. In this open state, the lead lead x can freely advance and retreat within the lead lead supply passage 51e.

[0042] The engagement piece 72 is provided in a plate shape extending forward above the fulcrum P, and is fitted into the inside of the opening / closing operation body 80.

[0043] On both side surfaces of the engagement piece 72, there are provided slide portions 73 which fit into the inclined engagement portions 82b of the opening / closing operation body 80 and slide thereon. The sliding portion 73 is a cylindrical projection that projects in the clip width direction. As the opening / closing operation body 80 slides in the front-rear direction, the sliding portion 73 comes into sliding contact with the inclined engagement portion 82b and moves in the opening / closing direction of the lead core supply passage 51e (in the illustrated example, in the barrel diameter direction).

[0044] The opening / closing operation body 80 is provided on one of the core extending / retracting operation bodies 50, and closes the lead core supply passage 51e when pushed forward, and opens the lead core supply passage 51e when pushed backward. This opening / closing operation body 80 has an operation piece portion 81 exposed on the surface side of the clip body 52, and an engagement piece portion 82 protruding inward in the radial direction of the shaft tube from this operation piece portion 81, and according to the illustrated example, is formed with an inverted concave cross section.

[0045] The operation piece 81 is formed in a flat plate shape, and has a protrusion 81a on its surface for facilitating hooking of a fingertip or the like (see FIG. 2). The rear surface of the operation piece 81 is provided with locking projections 81b, 81c at its front and rear ends (see FIG. 3).

[0046] When the opening / closing operating body 80 moves forward, the front over-ride engagement protrusion 81b rides forward over the front engagement / disengagement protrusion 52e (see Figure 2) of the clip body 52 to hold the opening / closing operating body 80 in a forward position (see Figure 4(a)), and when the opening / closing operating body 80 moves backward, it rides backward over the front engagement / disengagement protrusion 52e.

[0047] When the opening / closing operating body 80 is moved backward, the rear override engagement protrusion 81c overrides the rear engagement / disengagement protrusion 52f of the clip body 52 to hold the opening / closing operating body 80 in a rearward position (Figure 4(b)), and when the opening / closing operating body 80 is moved forward, it overrides the rear engagement / disengagement protrusion 52f to the front.

[0048] The engaging pieces 82 are provided in pairs so as to protrude inwardly from one side and the other side of the operating piece 81 in the clip width direction.

[0049] A slide protrusion 82a that protrudes in the clip width direction across the front-rear direction is provided at the end on the inner side in the shaft cylinder radial direction of each engagement piece 82. Two slide protrusions 82a are provided at an interval in the front-rear direction. Each slide protrusion 82a is engaged with the engaged portion 52a1 of the clip body 52 so as to ride over it inwardly in the radial direction of the shaft tube. In this locked state, each engagement piece 82 faces the clip body 52, is slidable in the front-rear direction, and is held so as not to be pulled out.

[0050] Further, an inclined engagement portion 82b inclined with respect to the axial direction of the barrel is provided on each engagement piece portion 82. A relief portion 82c is provided on the end side of the inclined engagement portion 82b.

[0051] The inclined engagement portion 82b is a through hole inclined so as to move away from the outer circumferential surface of the barrel 10 toward the front. The sliding portion 73 of the lead-core supply path opening / closing member 70 is inserted from the inside into the inclined engagement portion 82b. Reference numeral 82d in FIG. 3 denotes a recessed groove that guides the sliding portion 73 to the inclined engagement portion 82b when the lead-core supply path opening / closing member 70 and the opening / closing operation body 80 are fitted together.

[0052] The clearance portion 82c is a long through hole extending forward from the front end of each of the inclined engagement portions 82b. The clearance portion 82c is formed so as to fit into the sliding portion 73 when the clip body 52 rotates in the opening direction with the opening / closing operation body 80 in the rearward position (see FIG. 5). In the illustrated example, this relief portion 82c is inclined so as to move away from the outer circumferential surface of the barrel 10 toward the front, and the inclination angle is smaller than the inclination angle of the inclined engagement portion 82b.

[0053] The assembly procedure for the core retractable operation body 50 having the above-mentioned configuration will be described below. First, the lead core supply path opening / closing member 70 is attached to the opening / closing operation body 80, and then the opening / closing operation body 80 and the lead core supply path opening / closing member 70 are incorporated into the clip body 52. Then, the biasing member 53 is assembled to the slide body 51 , and the integral opening / closing operation body 80 , the lead-core supply path opening / closing member 70 and the clip body 52 are assembled to the slide body 51 .

[0054] Next, the characteristic functions and effects of the writing instrument A having the above configuration will be described in detail. As shown in Figures 4(a)(a'), in the initial state in which the opening / closing operating body 80 is in a forward position, the sliding portion 73 is located at the rear end side within the inclined engagement portion 82b, and the opening / closing piece portion 71 of the lead core supply path opening / closing member 70 closes the lead core supply path 51e, so that the lead tank 21 and the lead core x in the lead core supply path 51e are held so as not to slip out rearward.

[0055] When the opening / closing operation body 80 moves rearward relative to the clip body 52, the inclined engagement portion 82b slides on the sliding portion 73, and the sliding portion 73 moves outward in the radial direction of the barrel. When the opening / closing operation body 80 is moved to the rearward position shown in Fig. 4(b), the sliding portion 73 is located at the front end side of the inclined engagement portion 82b, and the opening / closing piece portion 71 of the lead core supply passage opening / closing member 70 opens the lead core supply passage 51e. Therefore, in this state, the lead core x can be supplied from the rear side into the lead core supply passage 51e.

[0056] In this way, with writing instrument A, the lead lead supply passage 51e can be easily opened and closed by sliding the opening / closing operation body 80 back and forth, and the open / closed state of the lead lead supply passage 51e can be easily understood by whether the opening / closing operation body 80 is in a forward or rearward position.

[0057] Furthermore, since the lead supply passage 51e is closed by sliding the opening / closing operation body 80 forward, it is possible to prevent erroneous operations such as when moving the opening / closing operation body 80 forward to cause the mechanical pencil core 20 to protrude from the front end of the barrel 10, or when knocking the opening / closing operation body 80 to advance the lead x from the mechanical pencil core 20, causing fingers to touch the opening / closing operation body 80 and opening the lead supply passage opening / closing member 70.

[0058] Furthermore, if the rear end of the clip body 52 is pressed radially inward in the shaft tube while remaining in the rearward position, or if an object is pinched between the front end of the clip body 52 and the shaft tube 10, causing the front end of the clip body 52 to rotate away from the shaft tube 10, the sliding portion 73 will move from within the inclined engagement portion 82b into the escape portion 82c (see Figure 5(c)). Therefore, the lead core supply path opening and closing member 70 having a generally inverted L-shape can be prevented from being damaged by the rotational force of the clip body 52.

[0059] In addition, when the clip body 52 is in the open state, the lead-core slip-out prevention portion 52c at the rear end of the clip body 52 is located on the rear extension of the lead-core supply path 51e. Therefore, the lead core x can be prevented from moving rearward through the open lead-core supply path 51e and slipping out to the outside by the lead-core slip-out prevention portion 52c (see FIG. 5(c)(c')).

[0060] <Modification> According to the above embodiment, an inclined engagement portion 82b is provided on the opening / closing operation body 80, and a sliding portion 73 is provided on the lead core supply path opening / closing member 70. However, as another example, it is also possible to provide a sliding portion on the opening / closing operation body, and an inclined engagement portion on the lead core supply path opening / closing member, in the opposite manner to the above.

[0061] According to the above embodiment, an opening / closing operation body 80 and a lead core supply path opening / closing member 70 are provided on the core protruding operation body 50, but as another example, it is also possible to provide an opening / closing operation body and a lead core supply path opening / closing member on the peripheral wall of the shaft tube.

[0062] Furthermore, the present invention is not limited to the above-described embodiment, and can be modified as appropriate without departing from the gist of the present invention. [Explanation of symbols]

[0063] 10: Shaft tube 20: Mechanical pencil core 30: Ballpoint pen core 40: Pressing member 50,60: Central core retractable operating body 51: Slide body 51b: Support part (fulcrum part P) 51e: Lead core supply route 52: Clip body 52a2: Shaft part (fulcrum part P) 52c: Lead core removal prevention part 70: Lead core supply path opening and closing member 73:Sliding part 80: Opening and closing operation body 82b: Inclined engagement part 82c:Relief section A:Writing implements x: lead core

Claims

1. The pen comprises a barrel, a lead core for a mechanical pencil that is provided in the barrel and that advances the lead core stored therein forward, a lead core supply passage opening / closing member that opens and closes a lead core supply passage to the lead core for the mechanical pencil in the barrel radial direction, and an opening / closing operation body that slides in the front-rear direction on the outer periphery of the barrel, A writing implement characterized in that the lead lead supply passage opening / closing member is opened and closed in conjunction with the sliding of the opening / closing operation body.

2. A writing instrument comprising a barrel, a lead for a mechanical pencil disposed within the barrel and for advancing the lead contained therein forward, a lead supply path opening / closing member disposed to open and close a lead supply path to the lead for the mechanical pencil, and an opening / closing operating body that slides in a front-to-rear direction on the outer periphery of the barrel, the lead supply path opening / closing member opening and closing in conjunction with the sliding of the opening / closing operating body, A writing instrument characterized in that one of the opening / closing operation body and the lead core supply path opening / closing member is provided with an inclined engagement portion inclined with respect to the axial direction of the barrel, and the other is provided with a sliding portion that slides in contact with the inclined engagement portion as the opening / closing operation body slides, and moves in a direction to open and close the lead core supply path.

3. A device comprising a barrel, a lead for a mechanical pencil that is provided within the barrel and that advances the lead contained therein forward, a lead supply path opening / closing member that is provided to open and close a lead supply path to the lead for the mechanical pencil, and an opening / closing operation body that slides in the front-to-rear direction on the outer periphery of the barrel, wherein the lead supply path opening / closing member is opened and closed in conjunction with the sliding of the opening / closing operation body, A writing instrument comprising a core protruding and retracting operation body provided on the outer periphery of the barrel and operable to slide in the front-rear direction, and a biasing member that biases the core for a mechanical pencil backward, the core for a mechanical pencil being protruded from the front end of the barrel by pushing the core protruding and retracting operation body forward against the biasing force of the biasing member, The opening and closing operation body is provided on the lead extension and retraction operation body, and closes the lead supply passage when in a forward position and opens the lead supply passage when in a rearward position.

4. A writing instrument as described in claim 1 or 3, characterized in that one of the opening / closing operating body and the lead core supply path opening / closing member is provided with an inclined engagement portion inclined with respect to the axial direction of the barrel, and the other is provided with a sliding portion that slides in contact with the inclined engagement portion as the opening / closing operating body slides, and moves in a direction to open and close the lead core supply path.

5. A writing instrument as described in claim 2 or 4, characterized in that the inclined engagement portion is formed in the shape of a long hole, and the sliding portion is configured to fit into the inclined engagement portion and slide in the extension direction of the inclined engagement portion.

6. A writing instrument comprising a core protruding and retracting operating body provided on the outer periphery of the barrel and operable to slide back and forth, and a biasing member which biases the core for the mechanical pencil backwards, wherein the core for the mechanical pencil is caused to protrude from the front end of the barrel by pushing the core protruding and retracting operating body forward against the biasing force of the biasing member, The opening / closing operation body is provided on the core extending / retracting operation body, The core extending / retracting operation body includes a clip body with an opening / closing operation function that separates the front side of the fulcrum from the outer circumferential surface of the barrel by pushing the rear side of the fulcrum toward the inside in the barrel radial direction, 6. The writing implement according to claim 2, wherein the inclined engagement portion is provided with a recess into which the sliding portion fits when the clip body is opened.

7. A writing instrument as described in Claim 6, characterized in that the clip body is provided with a lead lead slip-out prevention portion so that when the portion rearward of the fulcrum portion is pushed radially inward in the barrel tube, it is positioned on a rear extension of the lead lead supply path.

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