JP2011025579A - Connecting structure with writing body in sliding member of multi-core writing instrument - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To bend a writing body of a multi-core writing instrument in the shaft-radial direction toward the shaft axis of a shaft cylinder of a slide member into a desired bending angle, in a slide member connected with the writing body by inserting under pressure a connecting part provided at a tip of the writing body into the opened rear end in the writing body as a constituent element of a delivering means for retracting the writing tip of the writing body through the opening of the tapered shaft cylinder tip. <P>SOLUTION: The connecting part 21 of the slide member 12 is connected to the writing body 8 while being bent. The tip end face 19a of the tip 19 of the slide member with the connecting part is projected to the front of the connecting part side from both ends in the shaft-radial direction of the center, in the shaft-radial direction toward the shaft axis of the shaft cylinder, into a ridge-shape 23 having the same projection amount in the direction orthogonal to the shaft-radial direction. When the connecting part of the slide member is inserted under pressure into the rear end 20 of the writing body, the writing body is bent to the slide member, the rear end of the writing body is abutted on the slope of the ridge shape of the tip of the slide member. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a connection structure with a writing body in a slide member of a multi-core writing instrument.

  A plurality of writing bodies are slidably housed in the shaft cylinder, and the writing tip portion of the writing body is made to appear and disappear from the opening of the tip of the shaft cylinder formed in a tapered shape by the feeding means provided in the shaft cylinder. Multi-core writing instruments are known. As the feeding means, there is a so-called slide type or a rotary type. For example, the former is a ball pen refill ink tank as a writing body or a rear end portion of a core tank of a mechanical pencil unit. From the sliding groove formed in the axial direction in the rear end portion, the protruding portion is protruded outward, and the joint formed on the sliding member arranged to be slidable back and forth along the sliding groove is inserted, A shaft cylinder in which the desired writing body stored in the shaft cylinder is advanced by advancing the raised portion of the selected slide member in the direction of the tip of the shaft cylinder, and the writing tip portion of the writing body is formed in a tapered shape. It projects from the opening at the tip. In the latter, the barrel is composed of a barrel shaft (also referred to as a front shaft) and a rotary shaft (also referred to as a rear shaft) that is rotatably connected to the rear of the barrel shaft, and the rotary shaft is rotated with respect to the barrel axis. Then, the cam slant provided in the rotation shaft causes the slide member having the latching projection on the side portion connected to the rear end portion of the writing body to move, and the latching projection moves along the cam ramp surface. The writing body is advanced, and the leading end portion of the writing body is projected from the opening at the tip of the shaft cylinder formed in a tapered shape.

  In both feeding means, a slide member that press-fits the joint provided at the tip to the rear end portion of the writing body that is open and is connected to the writing body, so that the writing body can be moved back and forth is a component of the feeding means. It is necessary to connect the writing body to the slide member, but if the writing body is not connected so as to bend with respect to the sliding member in the direction of the axis of the shaft cylinder, When the writing tip of the writing body is projected from the tip opening, the writing tip moves forward along the inner wall surface of the tapered tube, so that the writing body is pressed against the axial center of the shaft. For example, if the ink tank or lead tank is made of synthetic resin, the ink tank or lead tank will be bent, the ink tank or lead pipe will be cracked, and the replacement lead contained in the lead tank will be broken. I will. In addition, when the ink tank or the lead tank is made of metal, the cursive body tends to bend with respect to the slide member, so that the operability of the feeding means is deteriorated or the joint portion of the slide member is damaged. There is a problem of end.

  In order to solve the above problem, conventionally, the joint of the slide member to be inserted into the opened rear end of the ink tank or the core tank constituting the cursive body is formed in a spherical shape or the like so that the cursive body is the shaft. A connecting structure of a writing body and a slide member in a multi-core writing instrument, which is bent toward the axial center in the axial direction toward the axial center of the cylinder, is known. Japanese Patent Application Laid-Open No. 8-216590 discloses a pressing member. 5 (sliding member) has a front protrusion (joint part) composed of a protrusion 5C protruding forward and a spherical part 5D formed at the front of the protrusion 5C. A technique is disclosed in which a ball-point pen 7 is connected to a slide member so as to be bendable by press-fitting a spherical portion 5D.

  However, as described above, even if the joint part of the slide member is provided in a shape in which the writing body can be bent in the axial radial direction with respect to the slide member, the joint structure is press-fitted to the rear end part of the writing body. Then, the bending angle when the cursive body is bent in the axial direction with respect to the slide member is regulated by the rear end of the cursive body coming into contact with the tip of the slide member, and the bending angle is not a large angle. .

  Describing in detail with reference to FIG. 11, for example, the slide member 12 in the slide type multi-core writing instrument is a spring with which a rear end of a spring (not shown) arranged to constantly urge the slide member 12 to abut against it. A receiving portion 18 is provided, and a front end portion 19 with which the rear end of the writing body 8 can abut is formed in front of the spring receiving portion 18 (lower side in FIG. 11). 8 has a shape in which a joining portion 21 that press-fits into the opened rear end portion 20 and is connected to the writing body 8 is provided. The shape of the joint portion 21 is not a spherical shape, but the shaft diameter of the shaft portion 21a formed in a columnar shape faces the axis of the shaft tube when the slide member 12 is inserted into the shaft tube (not shown). When the rear end edge portion 22a is in line contact with the inner wall surface of the rear end portion 20 of the cursive body 8 when the rear end portion 20 of the cursive body 8 is press-fitted into two opposite positions in the direction orthogonal to the direction, A swinging projection 22 whose protrusion amount gradually decreases as it goes is provided so that the writing body 8 bends in the axial direction. When the writing body 8 bends in the axial direction with respect to the slide member 12, the writing body 8 moves slightly forward with respect to the joint portion 21, and one end of the bending end of the writing body 8 on the bending side is the slide member 12. The curving body is brought into contact with the front end surface 19a of the front end portion 19 and the inner wall surface of the rear end portion 20 of the writing body 8 opposite to the bending side and the front end edge portion 21aa of the shaft portion 21a of the joint portion 21 abut. The bending angle with respect to the slide member 12 of 8 is restricted and does not become a large angle.

  In addition, the larger the diameter of the barrel, the greater the required bending angle of the writing body relative to the slide member relative to the slide member. Thus, it is difficult to bend the writing body at a desired angle in the axial radial direction with respect to the slide member only by providing the shape that can be bent in the axial radial direction.

  By the way, there is a lid connected to the rear end of the shaft cylinder by a hinge, and a slide member having a raised portion for opening the lid and pressing the rear end from the rear end of the shaft cylinder is connected. Japanese Laid-Open Patent Publication No. 2007-38635 discloses a slide-type multi-core writing instrument having a structure in which the written cursive can be exchanged according to the user's preference, and products are also provided on the market. Such a multi-core writing instrument will be described with reference to FIGS. 1 to 3 (for convenience, it is a multi-core writing instrument in which three writing bodies are accommodated in the axial cylinder), and the axial cylinder 2 formed in a tapered shape. In order for the writing tips 17a, 17b, and 17c of the writing bodies 8a, 8b, and 8c stored in the shaft cylinder 2 to protrude from the tip opening (not shown) of the writing tip, the writing tips 17a, 17b, and 17c first Since it advances along the inner wall surface of the constricted shaft cylinder 2, it is pressed to the axial center side of the shaft cylinder 2, and as shown in FIG. 3, slide members 12a, 12c connecting the writing bodies 8a, 8c. If it is going to arrange in each slide groove 3, since a part of slide members 12a and 12c will contact a partition wall part 16 for partitioning the inside of rear axis part 2b formed in rear axis part 2b, Slide members 12a and 12c are indicated by arrows for the respective writing bodies 8a and 8c. It is forced to not help tune in sea urchin outside direction. Therefore, in this type of slide-type multi-core writing instrument, the writing body 8 is not only bent in the axial direction in the axial direction toward the axial center of the shaft cylinder 2 with respect to each slide member 12 but also on the axial center side. It is necessary to bend to the opposite side.

JP-A-8-216590 JP 2007-38635 A

  The present invention has been made in view of these facts, and is a multi-core writing instrument in which a plurality of writing bodies are housed in a shaft cylinder so as to be movable back and forth, and the tip end of the writing cylinder is formed in a tapered shape. In the slide member that press-fits the joint provided at the front end to the open rear end portion of the cursive body and is connected to the cursive body, the cursive body is the axis of the slide member. It is an object of the present invention to provide a connecting structure with a writing body in a slide member of a multi-core writing instrument that can be bent with respect to an axial diameter direction toward the axis of a cylinder and bend to a desired bending angle.

The present invention
“1. Of a multi-core writing instrument in which a plurality of writing bodies are slidably housed in a shaft cylinder, a feeding means for projecting and retracting the writing tip of the writing body from an opening at the tip of the shaft cylinder formed in a tapered shape. It is a connecting structure with a writing body in a slide member that press-fits a joint provided at the tip to a rear end portion of the writing body that is a constituent element and is connected to the writing body, and the joint portion of the slide member An axis that is formed so that the cursive body can be bent and connected, and that the tip surface of the tip portion of the slide member provided with the joint portion faces the axis of the shaft tube at the tip portion when the slide member is inserted into the shaft tube In the radial direction, the central portion protrudes from the both ends of the axial radial direction to the front side of the joint portion, and in the direction orthogonal to the axial radial direction, has a mountain shape with the same protruding amount, and at the rear end portion of the cursive body Press-fit the joint part of the slide member and the cursive body is bent with respect to the slide member Upon Tsu, characterized in that the rear end of the writing body is connected so as to abut against the slopes of the mountain-shape of the front end portion of the slide member, connecting structure of the cursive of the slide member of the multi-core writing instrument.
2. Constituent element of feeding means for projecting and retracting the writing tip of the writing body in a tapered shape from a multi-core writing instrument in which a plurality of writing bodies are slidably housed back and forth in the shaft cylinder The joint structure of the slide member in the slide member that press-fits the joint portion provided at the front end to the rear end portion of the cursive body that is connected to the cursive body, and the joint portion of the slide member is the cursive body The shaft radial direction toward the axis of the shaft cylinder of the tip portion when the slide member is inserted into the shaft cylinder, at the tip surface of the tip portion of the slide member provided with the joint portion In the central portion of the head, a projection that makes the tip of the writing body abutting on the rear end of the cursive body is provided at a portion perpendicular to the axial diameter direction, and the joint portion of the slide member is press-fitted into the rear end portion of the writing body. When the cursive body is bent with respect to the slide member, the rear end of the cursive body is the slide member. Characterized in that the articulated so as to be in contact with the projections and the distal end surface of the distal end portion, articulated structure of the cursive of the slide member of the multi-core writing instrument.
3. Constituent element of feeding means for projecting and retracting the writing tip of the writing body in a tapered shape from a multi-core writing instrument in which a plurality of writing bodies are slidably housed back and forth in the shaft cylinder The joint structure of the slide member in the slide member that press-fits the joint portion provided at the front end to the rear end portion of the cursive body that is connected to the cursive body, and the joint portion of the slide member is the cursive body And the rear end of the cursive body in one axial radial direction of the cursive body, the central part is longer than the both ends in the axial radial direction, and the overall length of the cursive body is increased. In the other axial diameter direction orthogonal, the concave and convex shape is such that the entire length of the cursive body is the same, and when the joint portion of the slide member is press-fitted into the rear end portion of the cursive body, the convex portion at the rear end of the cursive body In the direction perpendicular to the axial diameter direction toward the axis of the shaft cylinder at the tip of the slide member Press-fit so that it is located at the minute, and when the cursive body is bent with respect to the slide member, the concave and convex slope at the rear end of the cursive body is connected so that it contacts the front end surface of the front end portion of the slide member The connection structure with the writing body in the slide member of a multi-core writing instrument. "
It is.

  The joint portion of the slide member inserted into the opened rear end portion of the cursive body in the present invention is provided so as to protrude forward at the tip portion of the slide member, but all the portions protruding forward from the tip portion are defined as the joint portion. That is, there is no particular limitation on the shape, for example, a shaft portion provided at a smaller diameter than the inner diameter of the rear end portion of the slide member opened at the front end portion of the slide member, and the rear end portion of the cursive body at the front end of the shaft portion It may have a shape configured with a press-fitting portion that is inserted in a press-fit state, or may be a shape that is inserted in a press-fit state at the rear end portion of the writing body at the tip end portion of the slide member. Further, the front end portion of the slide member refers to a portion with which the rear end of the cursive body comes into contact when the joint portion is inserted into the rear end portion of the cursive body that is opened. You may form so that a front-end | tip part may be provided in a slide member via the small diameter axial part smaller than the outer diameter of a front-end | tip part.

  In the present invention, in order to form the joint portion of the slide member so that the cursive body can be bent and connected, as described above, the diameter is smaller than the inner diameter of the rear end portion where the cursive body is opened in front of the front end portion of the slide member. A shaft portion may be provided, and a joint portion may be formed by providing a spherical portion or the like that can be bent on the front portion of the shaft portion, or in the same manner in front of the tip portion of the slide member. A shaft portion smaller in diameter than the inner diameter of the opened rear end portion is provided, and point contact with the inner wall surface of the rear end portion of the writing body on the side portion in the direction orthogonal to the axial diameter direction of the shaft portion toward the axial center of the shaft cylinder or A structure having a rocking contact portion that is press-fitted by line contact may be used, and a conventionally known shape of the joint portion can be employed as it is.

  In the present invention, the cursive is a ball-point pen refill composed of at least a ball-point pen tip and a pipe-shaped ink tank, or a tip of a pipe-shaped ink tank that contains ink, with a fiber bundle pen tip attached. Marker refills, mechanical pencil units composed of a mechanical pencil body and a pipe-shaped core tank that houses the core, etc. A rod-shaped body feeding unit having a mechanism for feeding a rod-shaped object, such as a drawing material or an eraser, housed in the pipe by pushing the pipe forward from the tip is also called a cursive body, and is incorporated in a multi-core writing instrument. Anything that is connected to the slide member and causes the tip to protrude from the tip opening of the shaft tube by a feeding operation can be used regardless of the purpose of use. They say the body.

  In the present invention, in order to achieve a desired bending angle in the axial diameter direction in which the writing body faces the axial center of the shaft cylinder with respect to the slide member, in the invention according to claim 1, This can be achieved by appropriately setting the slope of the slope in the mountain shape of the tip surface. The slope may be linear or arcuate. In the invention which concerns on 2nd part, it becomes possible by setting suitably the protrusion amount of the projection part provided in the front-end | tip part of a slide member. In the invention which concerns on Claim 3, it becomes possible by setting suitably the inclination of the slope in the corrugated uneven | corrugated shape of the rear end of a cursive body. The slope may be linear or arcuate as in the first aspect of the invention.

  Since the present invention has the structure as described above, an opening at the tip of the shaft cylinder in which the writing tip of the writing body is formed in a tapered shape in a multi-core writing instrument in which a plurality of writing bodies are movably stored in the shaft cylinder. In the slide member that press-fits the joint provided at the front end to the rear end portion of the cursive body that is a component of the feeding means that is projected and retracted from the portion, and the cursive body is connected to the cursive body, It can bend with respect to the axial diameter direction toward the axis, and can be easily bent to a desired bending angle.

It is a three-dimensional view of the slide type multi-core writing instrument of the Example of this invention. It is the figure which showed the state before accommodating the writing body connected to the slide member in the axial cylinder in the sliding type multi-core writing instrument of FIG. FIG. 2 is a longitudinal cross-sectional view of a main part of a slide-type multi-core writing instrument showing a state when a writing body connected to a slide member is stored in a shaft cylinder in the slide-type multi-core writing instrument of FIG. 1. BRIEF DESCRIPTION OF THE DRAWINGS It is a figure around the front-end | tip part of a slide member which shows the 1st Example of this invention, (a) is a front view, (b) is a right view. In FIG. 4, it is the figure which shows the state which press-fitted the junction part of the slide member in the rear-end part of a cursive body, (a) It is the figure which showed the state where the slide member and the cursive body were connected straight, (b) Slide It is a figure which shows the state which the member and the cursive body bent and were connected. It is a figure around the front-end | tip part of a slide member which shows the 2nd Example of this invention, (a) is a front view, (b) is a right view. 6 is a view showing a state in which the joint portion of the slide member is press-fitted into the rear end portion of the cursive body, (a) is a view showing a state in which the slide member and the cursive body are straightly connected, and (b) a slide. It is a figure which shows the state which the member and the cursive body bent and were connected. In the 3rd Example of this invention, it is a figure around the front-end | tip part of a slide member, (a) is a front view, (b) is a right view. In the 3rd Example of this invention, it is a figure around the rear-end part of a cursive body, (a) is a front view, (b) is a right view. The figure which showed the 3rd Example of this invention, and shows the state which press-fitted the junction part of the slide member in the rear-end part of the cursive body, (a) The figure which showed the state which the slide member and the cursive body connected straightly (B) It is a figure which shows the state which the slide member and the cursive body bent and were connected. It is the figure which shows the state which press-fitted the junction part of the slide member in the rear end part of a cursive body in the past, (a) It is the figure which showed the state with which the slide member and the cursive body were connected straight, (b) Slide member It is a figure which shows the state which the cursive body bent and was connected.

  In the articulated structure of the slide member of the multi-core writing instrument, the joint part of the slide member is formed so that the cursive body can be bent and connected, and at the tip of the slide member provided with the joint part or the rear end of the cursive body The joint portion of the slide member is press-fitted into the rear end of the cursive body so that the bending angle increases when the cursive body is bent with respect to the slide member.

Hereinafter, embodiments of the writing instrument of the present invention will be described with reference to the drawings.
As a multi-core writing instrument according to an embodiment of the present invention, the lid has a lid connected to the rear end of the shaft cylinder by a hinge, and the lid is opened and pressed to the rear end from the rear end of the shaft cylinder. A slide-type multi-core writing instrument having a structure in which a writing body connected to a slide member having a raised portion for replacement can be exchanged according to user's preference is provided. The present invention is a slide-type multi-core writing instrument of the present embodiment. It is not limited to the connection structure of the cursive body and the slide member.

  First, the slide-type multi-core writing instrument 1 according to the present embodiment will be briefly described with reference to FIGS. For the sake of convenience, a multi-core writing instrument in which three writing bodies are accommodated in the shaft cylinder is used, but two or four writing bodies may be accommodated in the shaft cylinder, and the number is not limited. The shaft cylinder 2 includes a front shaft portion 2a and a rear shaft portion 2b that are open at both ends, and the front shaft 2a and the rear shaft 2b are screwed together. Three sliding grooves 3 are formed on the peripheral side surface of the rear shaft 2b, and as shown in FIG. 3, the interior of the rear shaft 2b is divided into three by a partition member 4 and a partition wall portion 16, and 5a, 5b and 5c (in FIG. 3, it is drawn in a state of being divided into two for the sake of convenience), and the respective compartments 5a, 5b and 5cb are provided corresponding to the sliding grooves 3. .

  The ballpoint pen refill writing bodies 8a, 8b (FIG. 2), each of which is constituted by a ball-shaped pen tip 6 and a pipe-shaped ink tank 7 containing ink of a different color in each sliding groove 3 and each compartment 5a, 5b, 5c. And a writing body 8c such as a mechanical pencil unit composed of a mechanical pencil body 9 and a pipe-shaped core tank 10 for accommodating the core is connected to the tip, and has a raised portion 11 at the rear end. The slide members 12a, 12b, and 12c are slidably disposed with the protruding portion 11 protruding outward from the sliding groove 3, but the multi-core writing instrument 1 of the present embodiment has a rear end portion of the rear shaft portion 2b. The slide member 12a, 12b, 12c having the lid 13 connected by a hinge (not shown), the lid 13 being opened, and connecting the writing bodies 8a, 8b, 8c are indicated by arrows. Rear end opening 1 of rear shaft 2b The structure is arranged so that the writing body 8 and the slide member 12 are slidable back and forth in a state where the writing body 8 and the slide member 12 are always urged rearward by the springs 15 inserted into the compartments 5a, 5b and 5c. Is.

  In such a structure, as shown in FIG. 3, when the slide members 12a and 12c connected to the writing bodies 8a and 8c are arranged in the respective slide grooves 3, a part of the slide members 12a and 12c is rear shaft portion 2b. The slide members 12a and 12c are inserted into the respective writing bodies 8a and 8c by being bent outwardly as indicated by arrows. . Therefore, in the slide-type multi-core writing instrument 1 having such a structure, although not shown, the writing tip of the writing body 8 from the tip opening (not shown) of the front shaft portion 2a formed in a tapered shape. When projecting the portion 17, the writing tip 8 of the writing body 8 advances along the inner wall surface of the tapered front shaft portion 2 a, so that the writing body 8 is in front of the sliding member 12. It is necessary to have a structure that bends to the axial center side in the axial radial direction toward the axial center of 2a and also to the side opposite to the axial center side in the axial radial direction.

  4 to 5 show a first structure in which the writing body 8 is bent to the side opposite to the axial center side in the axial radial direction toward the axial center of the front shaft portion (not shown) with respect to the slide member 12. This example is shown. As shown in FIG. 4, the slide member 12 has a spring receiving portion 18 with which a rear end of a spring (not shown) arranged to constantly urge the slide member 12 backward is in contact with the slide member 12 as in the conventional structure. A front end portion 19 that can contact the rear end of the writing body 8 is formed in front of the spring receiving portion 18 (lower side in FIG. 4) (see FIG. 5). In front of the front end portion 19, there is provided a joint portion 21 that is press-fitted into the open rear end portion 20 of the writing body 8 and is connected to the writing body 8, and the writing body 8 is bent and connected.

  The joint portion 21 has two opposite portions in the direction orthogonal to the axial direction of the shaft tube 2 when the slide member 12 is inserted into the shaft tube 2 of the shaft portion 21a formed in a columnar shape. When the press body 8 is press-fitted into the rear end portion 20, the rear end edge portion 22 a comes into line contact with the inner wall surface of the rear end portion of the cursive body 8, and the amount of protrusion increases toward the front (lower side in FIG. 4). The structure is such that the oscillating protrusion 22 that gradually decreases is provided so that the writing body 8 can bend in the axial radial direction.

  The new structure in the present embodiment is such that the front end surface 19a of the front end portion 19 of the slide member 12 is joined to the central portion from both end portions in the axial radial direction in the axial radial direction as shown in FIG. In the direction perpendicular to the axial direction, the protrusion 21 protrudes forward on the part 21 side and protrudes so that the distance from the rear end of the writing body 8 becomes longer when the joining portion 21 is joined to the rear end of the writing body 8. Is that the projecting amount is the same and the distance from the rear end of the cursive body 8 is the same as the mountain shape 23. 5B, when the writing body 8 is bent with respect to the slide member 12, the rear end of the writing body 8 is a mountain shape of the front end surface 19a of the front end portion 19. Since it abuts against the slope of 23, the angle is larger than the bending angle in the conventional structure.

  6 to 7 show a second embodiment. As shown in FIG. 6, as in the first embodiment, the slide member 12 has a front end portion with which the rear end of the writing body 8 can contact the front of the spring receiving portion 18 (lower side in FIG. 6). 19 is formed (see FIG. 7). In front of the front end portion 19, a joint portion 21 having a swinging projection portion 22 that is press-fitted into the rear end portion 20 of the writing body 8 and is connected to the writing body 8 and can be connected by bending the writing body 8. It is provided.

  As shown in FIG. 6A, the new structure in the present embodiment is a portion in a direction perpendicular to the axial diameter direction of the central portion of the distal end surface 19a of the distal end portion 19 of the slide member 12 in the axial radial direction. In addition, as shown in FIG. 6, a pointed protrusion 24 protruding forward (downward in FIG. 6) that contacts the rear end of the writing body 8 is provided. Thus, as shown in FIG. 7B, when the writing body 8 is bent with respect to the slide member 12, the rear end of the writing body 8 comes into contact with the protrusion 24 and the front end surface 19a. Thus, the angle is larger than the bending angle in the conventional structure.

  8 to 10 show a third embodiment. As shown in FIG. 8, the slide member 12 is similar to the first embodiment, and in the same manner as the conventional slide member 12, a cursive body (not shown) is located in front of the spring receiving portion 18 (lower side in FIG. 8). 1) A tip 19 is formed on which the rear end can be contacted. In front of the front end portion 19, a joint portion 21 having a swinging projection portion 22 that is press-fitted into the rear end portion 20 of the writing body 8 and is connected to the writing body 8 and can be connected by bending the writing body 8. It is provided.

  As shown in FIG. 9, the new structure in the present embodiment is such that the rear end of the cursive body 8 is in the direction of one axial diameter of the cursive body 8, and the central portion is closer to the end of the cursive body 8 than both end portions in the axial radial direction. The overall length becomes longer (see (a) of FIG. 9), and the length of the cursive body is the same in the other axial diameter direction orthogonal to the axial diameter direction (see (b) of FIG. 9). This is provided in the uneven shape 25. Thus, as shown in FIG. 10 (b), when the writing body 8 is bent with respect to the slide member 12, the inclined surface 26 of the concavo-convex shape 25 at the rear end of the writing body 8 contacts the front end surface 19a. By contacting, the angle becomes larger than the bending angle in the conventional structure.

  The present invention provides a pipe-shaped shaft portion connected to a slide member of a cursive body in a multi-core writing instrument, in particular, made of metal, when it is desired to increase the number of inks accommodated in an ink tank or the number of cores accommodated in a core tank. Alternatively, the present invention can be applied to a case where the shaft diameter to be increased increases the number of cursive letters stored in the shaft cylinder.

DESCRIPTION OF SYMBOLS 1 Multi-core writing instrument 2 Shaft cylinder 3 Sliding groove 8 Writing body 11 Raised part 12 Slide member 17 Writing front-end | tip part 19 Front-end | tip part 19a Front end surface 21 Joint part 23 Mountain shape 24 Projection part 25 Uneven shape 26 Slope

Claims (3)

  In a multi-core writing instrument in which a plurality of writing bodies are slidably moved back and forth in a shaft cylinder, a component of a feeding means for projecting and retracting the writing tip of the writing body from an opening at the tip of the shaft cylinder formed in a tapered shape There is a connection structure with a writing body in a slide member that press-fits a joint provided at the tip to the rear end of the writing body that is connected to the writing body, and the writing body includes the joint of the slide member. The tip end surface of the slide member provided with a joint portion is bent and can be connected in the axial radial direction toward the axis of the shaft cylinder at the tip portion when the slide member is inserted into the shaft cylinder. The central portion protrudes forward from the both end portions in the axial radial direction toward the joint portion side, and has a mountain shape with the same protruding amount in the direction orthogonal to the axial radial direction. Press-fit the joint, and the cursive body bent with respect to the slide member The rear end of the writing body is characterized by being connected so as to abut against the slopes of the mountain-shape of the front end portion of the slide member, connecting structure of the cursive of the slide member of the multi-core writing instrument.   Constituent element of feeding means for projecting and retracting the writing tip of the writing body in a tapered shape from a multi-core writing instrument in which a plurality of writing bodies are slidably housed back and forth in the shaft cylinder The joint structure of the slide member in the slide member that press-fits the joint portion provided at the front end to the rear end portion of the cursive body that is connected to the cursive body, and the joint portion of the slide member is the cursive body The shaft radial direction toward the axis of the shaft cylinder of the tip portion when the slide member is inserted into the shaft cylinder, at the tip surface of the tip portion of the slide member provided with the joint portion In the central portion of the head, a projection that makes the tip of the writing body abutting on the rear end of the cursive body is provided at a portion perpendicular to the axial diameter direction, and the joint portion of the slide member is press-fitted into the rear end portion of the writing body. When the cursive body is bent with respect to the slide member, the rear end of the cursive body is the slide member. Characterized in that the articulated so as to be in contact with the projections and the distal end surface of the distal end portion, articulated structure of the cursive of the slide member of the multi-core writing instrument.   Constituent element of feeding means for projecting and retracting the writing tip of the writing body in a tapered shape from a multi-core writing instrument in which a plurality of writing bodies are slidably housed back and forth in the shaft cylinder The joint structure of the slide member in the slide member that press-fits the joint portion provided at the front end to the rear end portion of the cursive body that is connected to the cursive body, and the joint portion of the slide member is the cursive body And the rear end of the cursive body in one axial radial direction of the cursive body, the central part is longer than the both ends in the axial radial direction, and the overall length of the cursive body is increased. In the other axial diameter direction orthogonal, the concave and convex shape is such that the entire length of the cursive body is the same, and when the joint portion of the slide member is press-fitted into the rear end portion of the cursive body, the convex portion at the rear end of the cursive body In the direction perpendicular to the axial diameter direction toward the axis of the shaft cylinder at the tip of the slide member Press-fit so that it is located at the minute, and when the cursive body is bent with respect to the slide member, the concave and convex slope at the rear end of the cursive body is connected so that it contacts the front end surface of the front end portion of the slide member The connection structure with the writing body in the slide member of a multi-core writing instrument.

Images