JP2012187876A - Writing utensil structure with high durability - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a writing utensil structure with high durability, which is the smallest in the number of part items, simple in structure, has a design flexibility, is low in cost, and can withstand a severe use.SOLUTION: The writing utensil structures with high durability 1 to 1F are those having writing utensil cores 50 so as to be freely payed out. The structures are composed of: outer cylinders 10 to 10F which are formed of thin plates, bent into cylindrical shapes at arbitrary cross sections with both ends opened, and accommodate the writing utensils therein; tip support members 20 to 20F which are fit into tip-side openings 11 of the outer cylinders, and formed with tip writing part holes 22 which make tip writing parts 51 of the writing utensil cores appear in X-axial directions of main axes; writing utensil core pay-out members 40 which make the writing utensil cores detachably engaged with rear ends of the members and pay out the cores; and rear end support members 30 which are fit into rear-end side openings 12 of the outer cylinders, and have pay-out mechanisms 34 which are engaged with the writing utensil pay-out members and pay out the writing utensil core pay-out members. The members 10, 20, 30, 40 or the like are formed of metal such as stainless steel or hard resin materials, and the outer cylinders have elasticity.

Description

  The present invention relates to a writing instrument structure such as a ballpoint pen, and more particularly to a highly durable writing instrument structure having a simple design and a degree of design freedom.

  Writing instruments such as ballpoint pens and mechanical pens have various shapes and structures, and are used in daily life at homes, shops, companies and factories. These conventional writing instruments are used because the surface is painted or plated, or the material such as plastic is exposed, and is generally a round bar type that is weak in strength and easily bent or deformed. Sometimes it is easy to roll. On the other hand, several writing instruments have been proposed in which the outer shape is partially or partially formed into a non-circular cross-sectional shape such as a triangle, such as a grip portion.

  As a typical first example, as shown in FIGS. 15 and 16, the whole is small and light, and the grip 112 has a triangular cross-section, and a circle is formed at the boundary between the tapered tip 111 and the grip. Infants that have a peripheral edge 113 and a circumferential protrusion 114 at the rear of the circumferential edge, and that regulate the positions of the index finger, middle finger, and thumb in the axial direction by the circumferential edge 113 and the circumferential protrusion 114, so that the child can learn how to hold it correctly. A mechanical pencil has been proposed (see Patent Document 1).

  As a second example, as shown in FIG. 17, the gripping portion of the shaft tube is covered with a grip member 219 whose outer shape is cylindrical and whose inner shape is the same as that of the shaft tube, and a plurality of writings are provided in the shaft tube. By arranging the bodies 211, 212, 213 and operating the knock mechanism, the writing tip 217 of the writing body can be selectively projected and retracted from the opening on the tip side of the shaft tube, There has been proposed a multi-core writing instrument 201 in which the gripping portion of the shaft cylinder is a substantially polygonal cylindrical body having the same or more corners as the number of the writing bodies (see Patent Document 2).

  As a third example, as shown in FIGS. 18 and 19, the tip end side of the pen shaft 302 can be divided into a grip body 303 that can be elastically deformed, and the rear end portion side of the pen shaft 302 can be held by the pen shaft 302. The holding body 304 and the grip body 303 are connected by an elastically deformable connecting body 305 to be held over the entire length of the pen shaft. A writing instrument equipped with a writing grip that holds the pen shaft 302 by elastic deformation has been proposed (see Patent Document 3).

  As a fourth example, as shown in FIGS. 20 and 21, an outer shaft cam 410 having a first screw groove 411 formed on the inner peripheral surface and a first screw screwed in correspondence with the first screw groove 411. The cartridge holder 430 is formed on one side and the second screw 435 is formed on the other side, and the cartridge holder 430 is aligned with the axis and screwed in correspondence with the second screw 435. The inner shaft cam 440 having the two screw grooves 445 formed on the inner peripheral surface, and the fixing portion 441 of the inner shaft cam 440 coincide with the shaft center and are fixed to the fixing hole 459 of the head portion 451, and a plurality of wing portions 454, 456 includes an outer shaft portion 450 extending from one side of the head portion 451 to the other side, and the cartridge holder 430 is expanded or contracted by reciprocating linear movement of the outer shaft cam 410 and the outer shaft portion 450. Feeding Telescopic writing instrument that is coupled to chip 428 infested through chip hole 418 of the outer shaft cam 410 of the combined pen core 420 has been proposed (see Patent Document 4).

  However, in the infant pencil described in Patent Document 1, the connector 103 is attached to the shaft cylinder 101, and the chuck 104, the chuck ring 105, the knock spring 107, and the lead case 106, which are mechanical pencils, are assembled to the connector 103. It has been. That is, the chuck 104 with the chuck ring 105 fitted into the tapered outer peripheral surface is inserted from the front of the connector 103, and the tail end of the chuck 104 is press-fitted into the core case 106 inserted from the rear of the connector 103. A knock spring 107 interposed between the connector 103 and the lead case 106 repels the lead case 106 and the chuck 104 toward the tail end side. Accordingly, the chuck 104 is clamped by the chuck ring 105 and holds the lead core 109 inserted through the center hole.

  A knock cover 102 is fitted to the tail end of the lead case 106 and protrudes from the tail end opening of the shaft tube 101. When the knock cover 102 is pressed with a fingertip to perform a knock operation, the chuck 104 moves forward and the lead core 109 is fed out from the front end opening of the front end portion 111, and when the knock operation is released, the retracted chuck 104 is returned to the lead core 109 again. It becomes possible to write by biting.

A tip end of the shaft cylinder 101 is a tapered tip part 111, and a breaker 108 that holds the lead core 109 released from the chuck 104 at the time of knocking is disposed in the tip part 111. Further, as shown in FIG. 16B, a grip portion 112 is formed on the surface of the shaft cylinder 101 adjacent to the tip portion 111, and the cross-sectional shape thereof is a triangular cross-sectional shape with rounded corners. ing.

  The mechanical pencil for infants having such a structure has a large number of parts, in particular, the structure around the grip portion 112 has a complicated shape, and the core case 106 is thin and relatively weak in strength. There are problems such as being easy to do.

  The multi-core writing instrument 201 described in Patent Document 2 has a rear shaft 203 attached to the rear end of the front shaft 202, and further a sliding body case 204 is attached to the rear shaft 203 to form a shaft cylinder. The writing body 208 is urged rearward by a coil spring 217 and stored. The writing body 208 is a ball-point pen body in which a tip member that rotatably holds a ball (not shown) is press-fitted into the opening portion of the ink containing cylinder 211 as a writing tip portion 214. Further, the front end portion of the sliding body 205 serving as the operating body is press-fitted into the rear end side opening of the ink containing cylinder 211 of the writing body 208, and the raised portion 205 a is a locking window 204 a formed in the sliding body case 204. From the outer peripheral surface of the sliding body case 204. In addition, a clip member 219 is attached to the sliding body case 204 so as to be rotatable with respect to the sliding body case 204 (in the direction of arrows F and / or G). Similarly to the writing body 208, writing bodies 209 and 210 having a color different from that of the writing body 208 are arranged in the shaft cylinder. The writing bodies 209 and 210 include the ink containing cylinders 212 and 213, and the writing tip. This is a multi-color writing instrument for a three-color ballpoint pen, in which a ballpoint pen body provided with parts 215 and 216 and sliding bodies 206 and 207 is urged rearward by a coil spring (not shown).

  Since the gripping portion of the front shaft 2 has three writing bodies 208, 209, and 210, as shown in FIG. 17B, the gripping portion of the front shaft 202 has an external shape. Covers the cylindrical grip member 218 by two-color molding.

  The multi-core writing instrument 201 having such a configuration also has a large number of parts and an overall complicated shape and structure, and in particular, the shaft tube has a complicated shape of a three-part connecting body of the front shaft 202, the rear shaft 203, and the sliding body case 204. In addition, these wall thicknesses are partially thinned or the gripping portions are thinned, and the suddenly changing portions of their cross-sectional shapes are relatively weak in strength, and are easily bent or bent. There are problems such as.

  A writing instrument equipped with a writing grip described in Patent Document 3 is a grip 301 in which a divided body of a pen shaft 302, a grip body 303, and a holding body 304 is connected by a connecting body 305 and held over the entire length of the pen shaft. The divided protruding portion 306 of 303 has a complicated structure with a writing grip for holding the pen shaft 302 by elastic deformation.

  Further, the protruding portions 306 are in contact with the user's finger parts, respectively, and a finger pressure is always applied at the time of writing. The finger pressure elastically deforms and presses the pen shaft 302 side. The protruding portion 306 has a structure that generates a damper effect. The pressing portion of the protruding portion 306 is recessed by finger pressure to generate a damper effect. This structure includes a recess 307 formed in the protruding portion 306, an enclosure 308, and a covering 309. The enclosing body 308 encloses a gel material of a low-hardness resin, which is a flexible material, or a liquid such as water or silicone oil. The outer shape of the enclosure 308 is elliptical, and its outer skin is made of synthetic rubber such as butadiene or natural rubber, silicone, synthetic resin elastomer, or the like.

  The writing instrument equipped with the writing grip having such a configuration also has a large number of parts and has a complicated structure as a whole, and the pen shaft 302 connected by the elastically deformable connecting body 305 is particularly thin. Furthermore, the grip body 303, the coupling body 305, the holding portion 304, and the like made of thermoplastic resin also have problems such as relatively weak strength.

  The steerable telescopic writing instrument described in Patent Document 4 includes an outer shaft cam 410, a pen core 420, a cartridge holder 430, an inner shaft cam 440, and an outer shaft portion 450. The outer shaft cam 410 is a shaft-shaped body having a hollow 419, a hollow conical portion in which a tip hole 418 is formed so that the tip 428 of the pen core 420 protrudes and retracts, and the recessed second side surfaces 414 and 416, The first side surfaces are disposed at right angles to the first side surfaces and protrude relatively to each other. A hollow is formed in the axial direction inside the second side surfaces 414 and 416. The pen core 420, the cartridge holder 430, and the inner A shaft cam 440 is inserted.

  In the outer shaft cam 410, the first screw groove 411 formed on the inner peripheral surface close to the tip hole 418 is screwed with the first screw 31, and the tip 428 of the pen core 420 is inside the tip hole of the outer shaft cam 410. The first screw 31 slides so that an appropriate amount protrudes from the outside. The first screw 431 and the second screw 435 are made of engineering plastic.

  In addition, in the depressed second side surfaces 414 and 416, locking projections 412 are formed on the side where the pen core 420 is inserted, respectively, and serve as a guide and a stopper after extension in the extension operation. Fulfill. The pen core 420 includes a pole 422 that stores ink and a chip 428 that is a writing unit.

  The cartridge holder 430 has a function of inserting and fixing the pen core 420 in a state in which the pen core 420 is aligned with the axis of the inner diameter, and the first screw is provided on the outer peripheral surface of the open end for a double screw type expansion / contraction mechanism. 431 is formed, and a second screw 435 is formed on the circumferential surface from this end to the starting point of the pen core fixing portion 436.

  The pen core fixing portion 436 has a hollow cylindrical shape, the end surface except the vent hole 437 is closed, a fixing position 438 of a size for fixing the pen core 420 is formed, and the fixing portion 441 of the inner shaft cam 440 is formed. It is rotatably coupled to a rotation hole 446 formed in the axial direction from the inside. The cartridge holder 430 rotates the first screw 431 and the second screw 435 by the rotation.

  Here, the first screw 431 has a relatively narrow screw pitch corresponding to the first screw groove 411, and the second screw 435 has a relatively wide screw pitch corresponding to the second screw groove 445. Have. The first screw 431 is in a screw correspondence relationship with the first screw groove 411 formed on the inner peripheral surface of the outer shaft cam 410, and the second screw 435 is the inner peripheral surface of the inner shaft cam 440. The second screw 445 formed at 449 has a screw correspondence relationship.

  The operation-type telescopic writing instrument having such a configuration has a compact size and streamlined design due to a double screw type expansion / contraction mechanism that brings the pen core 420 in and out at the same time as the expansion and contraction of the axial length. In order to prevent the cartridge holder 430 from detaching from the outer shaft cam 410, the helical start positions of the first screw 431 and the second screw 435 coincide with each other in the circumferential direction. There is a problem that the degree of freedom in design is lacking, for example, it is necessary to design so that the starting points of the spiral motion are different from each other.

  In these conventional writing instruments, the shape and configuration are complicated, the number of parts is high, the cost is high, the degree of freedom of design is lacking, and the durability is poor when used harshly, for example in factories and construction sites. There was a point.

Japanese Patent Application Laid-Open No. 10-100582 JP 2004-58549 A JP 2009-178852 A Special table 2008-526571

  The present invention has been made in view of the above-described problems of the prior art, and the object of the present invention is to reduce the number of parts to a minimum and to have a degree of freedom in design with a simple configuration, and is inexpensive. The purpose is to provide a highly durable writing instrument structure that can withstand severe use in factories and construction sites.

  In order to achieve the above object, the highly durable writing instrument structure of the present invention is a writing instrument structure that is provided with a writing instrument core so as to be freely steered, and is bent and formed into an arbitrary cross-sectional cylindrical shape having openings that are open at both ends from a thin plate. An outer cylinder that accommodates the writing instrument core therein, and a tip writing section hole that is fitted in the opening on the distal end side of the outer cylinder and that causes the distal writing section of the writing instrument core to protrude and retract in the X-axis direction of the main shaft. The writing tool core is inserted into the rear end side opening of the outer cylinder, and the writing tool core feeding member that detachably engages the writing tool core with the rear end portion and feeds it in the X-axis direction. And a rear end support member provided with a feeding mechanism that engages with the lead feeding member and advances and retracts the writing tool lead feeding member in the X-axis direction.

  In addition, a front end side fixing mechanism and a rear end side fixing mechanism that restrain and fix each other's movement are provided at the fitting portions of the outer cylinder, the front end support member, and the rear end support member, respectively.

  In addition, the front end fixing mechanism and the rear end fixing mechanism are respectively provided with one or a plurality of arbitrarily formed front end side engaging openings and rear end sides at the fitting portions of the front end supporting member and the rear end supporting member of the outer cylinder. The engagement opening and the outer surface of the outer cylinder inner fitting portion of the front end support member and the rear end support member are partially or entirely formed in an arbitrary cross-sectional shape inscribed in the outer cylinder, and are inscribed A flange part or a protrusion part formed by expanding the diameter continuously or partially in a stepped manner at a position corresponding to the front end side engagement opening and the rear end side engagement opening on the outer surface, and the flange part Alternatively, a part or the whole of the outer surface of the projecting portion is fitted into the front end side engagement opening and the rear end side engagement opening, and is exposed to the substantially outer surface of the outer cylinder to be engaged with the front end support member. The rear end support member is fixed to the outer cylinder.

  Further, the front end fixing mechanism and the rear end fixing mechanism each have an arbitrary cross-sectional shape in which the outer surfaces of the outer cylinder internal fitting portions of the front end support member and the rear end support member are inscribed in the outer cylinder partially or entirely, respectively. The front end support member and the rear end support member are fixed to the outer cylinder by caulking the outer surface of the outer cylinder that is formed in the outer cylinder and in which the front end support member and the rear end support member are inscribed in one place or a plurality of places, respectively. It can also be configured.

  Further, the feeding mechanism of the present invention is formed so that the writing tool core can be inserted through the male screw formed on the outer surface of the writing tool core feeding member and the X axis of the main shaft of the rear end support member, The writing tool lead feeding member is composed of a female screw to which the male screw is screwed, and the writing tool lead feeding member to be screwed to the rear end support member is rotated forward and backward in the X-axis direction together with the writing tool lead. To do.

  Further, the outer cylinder of the present invention is characterized in that the thin plate is bent and formed into an open cross-sectional shape having a gap of an arbitrary width along the X-axis direction at both end butting portions in one outer surface.

  Further, the outer cylinder is selectively used from an arbitrary metal having elasticity or a thin plate of stainless steel metal.

  Further, the front end support member, the rear end support member, and the writing instrument core feeding member are selectively used from any metal, stainless steel metal, or hard resin material.

  Furthermore, a hook member having an arbitrary shape is provided at the rear end of the writing instrument core feeding member.

  According to the present invention, an outer cylinder that is bent from a thin plate into a cylindrical shape having an arbitrary cross-section, a tip support member that is fitted in the tip opening of the outer cylinder, a writing instrument core feeding member that feeds a writing instrument core, and an outer A rear end support member that is fitted in the rear end opening of the cylinder and includes a feeding mechanism that engages with the writing tool lead feeding member and advances and retracts the writing tool lead feeding member, thereby minimizing the number of parts. Offering a highly durable writing instrument structure that can be easily configured to any desired size with a simple and small configuration, and has design freedom, and can withstand severe use in factories and construction sites. There is an effect that can be done.

  In addition, when the outer cylinder has a non-circular cross-sectional shape such as a triangle or a polygon, it can be prevented from falling off from a desk or the like due to unexpected rolling during use, and can be gripped with a stable grip without providing a special grip. There is also an effect to be secured.

  In addition, the fitting portion of the outer cylinder, the front end support member, and the rear end support member is provided with a front end fixing mechanism and a rear end fixing mechanism that restrain and fix each other's movements. There is an effect of ensuring reliability.

  Further, the front end fixing mechanism and the rear end fixing mechanism are respectively provided in the outer cylinder of the front end support member and the rear end support member in one or more front end side engagement openings and rear end side engagement openings provided in the outer cylinder. The front end support member and the rear end support member are fixed to the outer cylinder by partially or entirely fitting the flanges or protrusions formed on the inscribed outer surface, so that the assembly can be performed with a simple structure. There is an effect that becomes easy.

  Further, the front end fixing mechanism and the rear end fixing mechanism are configured by caulking the outer surface of the outer cylinder with which the front end support member and the rear end support member are inscribed, respectively, at one place or a plurality of places. There is an effect that the manufacturing cost can be reduced with a simpler structure by omitting the flange portion or the protruding portion of the rear end support member.

  Further, the feeding mechanism of the present invention is composed of a male screw formed on the outer surface of the writing instrument core feeding member and a female screw into which the male screw of the writing instrument core feeding member formed on the rear end support member is screwed. In addition, there is an effect that a simple and reliable structure can be obtained with a minimum.

  In addition, the outer cylinder is bent and formed into an open cross-sectional shape with a gap of an arbitrary width along the X-axis direction at the both end butting portion inside the thin plate, so the internal state of the writing instrument core, etc. is observed through the gap It is possible to disengage and disengage the front end side fixing mechanism and the rear end side fixing mechanism by expanding the outer cylinder from the gap, and it is possible to easily attach and remove the front end support member and the rear end support member. There is an effect that the convenience of assembly and maintenance is ensured.

  In addition, since the outer cylinder is selectively used from any metal having elasticity or a thin plate of stainless steel metal, the degree of freedom of design according to the use situation is further expanded, and particularly when stainless steel metal is used, the outer cylinder is coated. Even without any surface treatment such as plating or plating, aesthetics and durability can be permanently secured. Furthermore, the front end support member and the rear end support member are secured by reversible elastic deformation that ensures the engagement and disengagement of the front end side fixing mechanism and the rear end side fixing mechanism by the elastic force of the outer cylinder, and the outer cylinder expands and contracts relatively easily. Has the effect of facilitating the installation and removal of the.

  In addition, the tip support member, rear end support member, and writing instrument lead feeding member, when used selectively from stainless steel metals and hard resin materials, permanently ensure aesthetics and durability without any surface treatment such as painting or plating. it can. In addition, when a combination of a rear end support member made of hard resin and a stainless steel metal writing tool core feeding member or a dissimilar metal is selected, good oilless lubricity in both screw type feeding mechanisms is ensured. effective.

  In addition, since a latching member having an arbitrary shape such as a ring or a hook type is provided at the rear end of the writing instrument core feeding member, the latching member also serves as a grip portion during use and latches at an arbitrary place when not in use. This has the effect of ensuring convenience.

It is a top view which shows the concept of the highly durable writing instrument structure of one Embodiment (Example 1) of this invention. It is a side view of the highly durable writing instrument structure of FIG. It is AA arrow sectional drawing of the highly durable writing instrument structure of FIG. It is a longitudinal cross-sectional view of the highly durable writing instrument structure of FIG. It is a longitudinal cross-sectional view of the front-end | tip support member of Example 1 of this invention. It is a BB arrow (front) figure of the front-end | tip support member of FIG. It is a longitudinal cross-sectional view of the rear-end support member of Example 1 of this invention. It is a front view of the rear-end support member of FIG. It is principal part (front end side adhering mechanism part) sectional drawing of the highly durable writing instrument structure of another embodiment (Example 2) of this invention. It is principal part (tip side adhering mechanism part) sectional drawing of the highly durable writing instrument structure of another embodiment (Example 3) of this invention. It is principal part (tip side adhering mechanism part) sectional drawing of the highly durable writing instrument structure of another embodiment (Example 4) of this invention. It is principal part (tip side adhering mechanism part) sectional drawing of the highly durable writing instrument structure of another embodiment (Example 5) of this invention. It is principal part (tip side adhering mechanism part) sectional drawing of the highly durable writing instrument structure of another embodiment (Example 6) of this invention. It is principal part (front end side adhering mechanism part) sectional drawing of the highly durable writing instrument structure of another embodiment (Example 7) of this invention. It is an external view of the mechanical pencil for infants of the past (patent document 1). (A) is a longitudinal cross-sectional view of the mechanical pencil for infants of FIG. 15, (b) is a cross-sectional view of the grip of the mechanical pencil for infants of FIG. (A) is a longitudinal cross-sectional view of the multicore writing instrument of the past (patent document 2), (b) is a HH arrow sectional view of the holding part of the multicore writing instrument of (a). It is an external appearance perspective view of the writing instrument equipped with the conventional writing grip (patent document 3). It is JJ arrow sectional drawing of the grip main body of the writing instrument equipped with the writing grip of FIG. It is a longitudinal cross-sectional view of the conventional operation type expansion-contraction writing instrument (patent document 4). It is an exploded view for demonstrating the structure of the operation-type expansion-contraction writing instrument of FIG.

  Hereinafter, the specific example of the form for implementing the writing instrument structure of this invention is demonstrated, referring an accompanying drawing. In these accompanying drawings, the same reference numerals are assigned to the same members even if the shape of some members in the highly durable writing instrument structures 1, 1A, 1B, 1C, 1D, 1E, and 1F of Examples 1 to 7 is different. It is.

  The highly durable writing instrument structure 1 according to the first embodiment of the present invention is a writing instrument structure including a writing instrument core 50 such as a ballpoint pen that can be operated freely as shown in FIGS. An outer cylinder 10 that is bent into a substantially equilateral triangular cross-sectional shape having a front end side opening portion 11 and a rear end side opening portion 12 and accommodates the writing instrument core 50 therein, and a front end side opening portion 11 of the outer cylinder 10. A tip support member 20 provided with a tip writing portion hole 22 that is fitted and projects the tip writing portion 51 of the writing tool core 50 in the X-axis direction of the main shaft, and the writing tool core 50 are detachably engaged with the rear end portion thereof. Then, the writing instrument core feeding member 40 that is fed out in the X-axis direction and the rear end side opening 12 of the outer cylinder 10 are fitted into the engagement portion, and the writing instrument core feeding member 40 is engaged with the writing instrument core feeding member 40 in the X-axis direction. A rear end support member 30 provided with a feeding mechanism 34 that moves forward and backward. It has a.

  As shown in FIGS. 1 and 3, the outer cylinder 10 of the first embodiment has, for example, a thin plate having a thickness of 1 mm, and a butt portion on one outer surface having a gap of an arbitrary width b, for example, b = 2 mm along the X-axis direction. A side length a, for example, a = 15 mm, is formed to be bent into an approximately equilateral triangular shape with an open cross section, and the three ridge line corners are each formed into a smooth substantially arcuate surface. Further, the three surfaces of the fitting portion of the front end support member 20 and the rear end support member 30 of the outer cylinder 10 are each of an arbitrary size symmetrical with respect to the X axis, for example, the width c = 5 mm in the X axis direction, and perpendicular to the X axis. A front end side engagement opening 14 and a rear end side engagement opening 15 formed in a quadrangular shape having a direction width e = 4 mm are formed.

  Further, the three ridge line corners of the front end side opening portion 11 and the rear end side opening portion 12 rear end portion of the outer cylinder 10 are not shown, but it is cut and smoothly formed so that it is aesthetic and safe. From the aspect, it is desirable to be kind to people.

  The outer cylinder 10 is selectively used from an arbitrary metal having elasticity or a thin plate of stainless steel metal.

  This increases the degree of freedom of design by selecting a metal thin plate according to the usage situation, and especially when stainless steel metal is used, aesthetics and durability can be permanently secured without any surface treatment such as painting or plating. .

  Here, the point of using the “elastic thin plate” of the outer cylinder 10 and the point of being bent into the “open cross-sectional shape having the gap 13 of the butt portion of the thin plate” are some of the important features of the present invention. The details will be described later.

  As shown in FIGS. 3 to 6, the distal end support member 20 is configured such that the rear half of the outer cylinder 10 that is fitted into the distal end side opening portion 11 is inscribed in the distal end side opening portion 11, for example, an outer diameter D2≈7. The diameter of the cylindrical surface 24 is increased to a stepped shape having a width f≈4.9 mm in the X-axis direction at an intermediate portion in the X-axis direction of the main shaft of the cylindrical surface 24 corresponding to the distal end side engagement opening 14. For example, a flange portion 23 having an outer diameter D1≈8.6 mm is formed. A front end side outer surface 25 of the cylindrical surface 24 is formed in a tapered conical surface.

  A part of three outer surfaces that are symmetrical with respect to the X-axis of the flange portion 23, that is, at three equally spaced intervals in the circumferential direction, are fitted into the distal end side engaging opening 14 to the substantially outer surface of the outer cylinder 10. By partially exposing and engaging, the rear end portion of the tip support member 20 is restrained from moving relative to the outer cylinder 10 (X-axis direction movement and rotation around the X-axis), and the tip-side opening 11 It is fixed to. In this manner, the distal end fixed by restraining the mutual movement at the fitting portion of the outer cylinder 10 and the distal end support member 20 between the distal end side engagement opening 14 of the outer cylinder 10 and the flange portion 23 of the distal end support member 20. A fixing mechanism 16 is configured.

  Further, the tip support member 20 is provided with a tip writing portion hole 22 that guides and retracts the tip writing portion 51 of the writing tool core 50 along the X axis on the tip side, and the writing tool core on the rear end side of the tip writing portion hole 22. A writing instrument core insertion hole 21 through which a rear member 50 of, for example, an ink containing cylinder 52 of a ballpoint pen is inserted is enlarged and formed. The step portion 26 formed at the connecting portion between the writing instrument core insertion hole 21 and the tip writing portion hole 22 has a stopper function that the tip portion of the ink containing cylinder 52 contacts and is received. The rear end corner of the writing instrument core insertion hole 21 is cut all around to form a tapered surface 27. The tapered surface 27 has a guide function that makes it easy to insert the tip writing portion 51 of the writing instrument core 50 into the writing instrument core insertion hole 21.

  As shown in FIGS. 1, 2, 4, 7, and 8, the rear end support member 30 has an outer surface serving as a fitting portion in the rear end side opening 12 of the outer cylinder 10 in the rear end side opening 12. For example, the inner surface is formed on the cylindrical surface 33 having an outer diameter D2≈7.6 mm, and the X-axis direction width f≈4, for example, at an intermediate portion of the main surface of the cylindrical surface 33 corresponding to the rear end side engagement opening 15 in the X-axis direction. A flange 32 having an outer diameter D1≈8.6 mm, for example, having a stepped diameter of .9 mm is formed.

  A part of three outer surfaces symmetrical to the X-axis of the flange portion 32, that is, at three equally spaced intervals in the circumferential direction, are fitted into the rear end side engagement opening 15 so as to be substantially outer surfaces of the outer cylinder 10. The rear end support member 30 is restrained from relative movement with respect to the outer cylinder 10 (X-axis direction movement and rotation around the X axis) by being partially exposed and engaged until the inner end of the rear end side opening 12 is reached. It is fixed to. As described above, the rear end side engagement opening 15 of the outer cylinder 10 and the flange portion 32 of the rear end support member 30 restrain the mutual movement at the fitting portion of the outer cylinder 10 and the rear end support member 30 and fix them. The rear end fixing mechanism 17 is configured.

  Further, the rear end support member 30 is formed with a female screw 31 through which the writing instrument core 50 and the writing instrument core feeding member 40 can be inserted along the X axis. The front end and the rear end corner of the female screw 31 are cut all around to form a tapered surface. In particular, the tapered surface of the rear end corner portion has a guide function that makes it easy to insert the tip writing portion 51 of the writing instrument core 50 into the female screw 31.

  As described above, the front end fixing mechanism 16 and the rear end fixing mechanism 17 are respectively provided in the front end side engagement opening 14 and the rear end side engagement opening 15 provided in the outer cylinder 10, and the front end support member 20 and the rear end end fixing mechanism 15. The front end support member 20 and the rear end support member 30 are fixed to the outer cylinder 10 by partially fitting the flange portions 23 and 32 formed on the outer surfaces 24 and 33 inscribed in the outer cylinder of the support member 30. Therefore, assembly or disassembly becomes easy with a simple structure. The specific reason why this assembly or disassembly is easy is as follows.

  Since the outer cylinder 10 is made of an elastic thin plate and is bent and formed into an open cross-sectional shape having a gap 13 on one outer surface, it is relatively easy for the outer cylinder 10 to reversibly expand and contract (elastically deform). Therefore, at the time of assembly, the front end support member 20 and the rear end support member 30 are pushed into the front end side opening 11 and the rear end side opening 12 of the outer cylinder 10 from the rear end side outer surface 24 and the front end side outer surface 33, respectively. As shown in FIGS. 1 to 4, the flange parts 23 and 32 are partially inserted into and over the outer cylinder 10 to partially extend into the front end side opening part 11 and the rear end side opening part 12. Are easily fixed in the front end side opening 11 and the rear end side opening 12.

  Accordingly, by setting the outer surfaces 24 and 33 of the front end support member 20 and the rear end support member 30 to be thicker so as to strongly contact the inner surfaces of the front end side opening portion 11 and the rear end side opening portion 12, the outer cylinder 10. It can be easily understood that the fixing performance of the leading end fixing mechanism 16 and the trailing end fixing mechanism 17 is improved by the elastic force.

  Further, at the time of disassembly, the outer cylinder 10 is temporarily expanded using a tool as appropriate through the gap 13 near the front end side opening 11 and the rear end side opening 12 to open the front end side opening 11 and the rear end side opening. The front end support member 20 and the rear end support member 30 are easily detached from the front end side opening portion 11 and the rear end side opening portion 12 by releasing the partial fitting of the flange portions 23 and 32 from within the portion 12. be able to.

  With such a configuration of the front end fixing mechanism 16 and the rear end fixing mechanism 17, the front end support member 20 and the rear end support member 30 can be attached to and detached from the front end side opening 11 and the rear end side opening 12 of the outer cylinder 10. It is fitted.

  As shown in FIG. 4, the writing instrument lead feeding member 40 has a small-diameter leading end engaging portion 43 fitted into the rear end of the ink containing cylinder 52 of the writing instrument lead 50 at the leading end, and a relatively large diameter at the trailing end. Are formed, and a male screw 41 is formed on the outer surface between the front end engaging portion 43 and the holding portion 42 so as to be engaged with the female screw 31 of the rear end support member 30. The male screw 41 is thicker than the tip engaging portion 43 and has a diameter equal to or smaller than that of the grip portion 42.

  In addition, a latch member 60 having an arbitrary shape such as a ring or a hook type is provided at the rear end of the writing instrument core feeding member 40 through the latch member mounting hole 44.

  The latching member 60 serves as a gripping part when the writing instrument core 50 is fed out, and the convenience that the latching member 60 can be latched at an arbitrary place when not in use is ensured.

  The writing instrument core feeding member 40 screwed into the female screw 31 of the rear end support member 30 is rotated forward and backward to advance and retract in the X-axis direction together with the writing instrument core 50. As described above, the male screw 41 of the writing instrument lead feeding member 40 and the female screw 31 of the rear end support member 30 screwed to the writing tool core feeding member 40 constitute a simple and highly reliable feeding mechanism 34 with a minimum number of parts.

  The front end support member 20, the rear end support member 30, and the writing instrument core feeding member 40 are selectively used from any metal, stainless steel metal, or hard resin material.

  As a result, it is possible to provide a highly durable writing instrument structure 1 that is inexpensive and has a high degree of freedom in design with an arbitrary size and shape for various uses. In addition, when these members 20, 30 and 40 are selectively used from stainless steel metal or hard resin material, aesthetics and durability can be permanently secured without surface treatment such as painting or plating.

  In addition, for example, when a combination of the rear end support member 30 made of hard resin and the stainless steel writing instrument core feeding member 40 or a dissimilar metal is selected, good oilless lubricity in both screw type feeding mechanisms 34 is ensured. Is done.

  The highly durable writing instrument structure 1A according to another embodiment (Example 2) of the present invention is, as shown in FIG. 9 which is a cross-sectional view comparable to FIG. The structure is the same as that of the first embodiment except that the outer surface structure of the end support member is different.

  That is, the front end support member 20A inscribed in the front end side opening and the rear end side opening of the outer cylinder 10 of the second embodiment, the front end side engagement opening 14 of the outer surface 24A of the rear end support member (not shown), and the rear end (not shown). A substantially rectangular plane-shaped partial collar portion (or projection) 23A formed by expanding the diameter partially in a stepped shape at three circumferentially equally divided positions corresponding to the side engagement openings is formed on the distal end side. A point where the entire protrusion 23A fits in the front end side engagement opening 14 and the rear end side engagement opening in the engagement opening 14 and the rear end side engagement opening (that is, the front end fixing mechanism 16A and the rear end fixing mechanism). However, the only difference is that the flange 23 of the first embodiment is continuously formed over the entire circumference. Therefore, further detailed description is omitted.

  The highly durable writing instrument structure 1B of another embodiment (Example 3) of the present invention has a cross-sectional shape of the outer cylinder 10B as shown in FIG. 10 which is a cross-sectional view comparable to FIG. The configuration is the same as that of the first embodiment except for the differences.

  That is, the outer cylinder 10B of the third embodiment has a side length aB of an open cross-sectional shape in which a thin plate having a thickness of 1 mm has a gap 13B having a width bB = 2 mm along the principal axis (X axis) direction at both ends in one outer surface. = 15 mm, and each of the four ridge line corners is formed in a smooth substantially arcuate shape. In addition, the X-axis direction width c = 5 mm and the X-axis perpendicular direction are provided at four circumferential positions symmetrical to the X-axis on the four surfaces of the front end support member 20 and the rear end support member (not shown) of the outer cylinder 10B. A front end side engagement opening 14B formed in a quadrangle with a width e = 4 mm and a rear end side engagement opening (not shown) are opened, and each of the front end support member 20 and the rear end support member is divided into four equal parts in the circumferential direction. Is partially fitted into the front end side engagement opening 14B and the rear end side engagement opening (that is, the front end fixing mechanism 16B and the rear end fixing mechanism). The only difference is that it is formed. Therefore, further detailed description is omitted.

  A highly durable writing instrument structure 1C according to yet another embodiment (Example 4) of the present invention is, as shown in FIG. 11 which is a cross-sectional view comparable to FIG. The rear end support member is configured in the same manner as in the first embodiment except that the outer surface structure is different.

  That is, the front end support member 20C and the rear end support member (not shown) of Example 4 are formed in a substantially equilateral triangular cross-sectional shape that is entirely inscribed in the front end side opening portion and the rear end side opening portion of the outer cylinder 10, respectively. The outer surface 24 </ b> C has a substantially rectangular planar shape formed by partially expanding in a stepped shape at three circumferentially equally spaced positions corresponding to the front end side engagement opening 14 and the rear end side engagement opening (not shown). A partial collar (or projection) 23C is formed, and the entire projection 23C is fitted in the front end side engagement opening 14 and the rear end side engagement opening in the front end side engagement opening 14 and the rear end side engagement opening. The points to be joined (that is, the tip fixing mechanism 16C and the rear end fixing mechanism) are only different from the point that the flange 23 of the first embodiment is continuously formed over the entire circumference of the intermediate portion of the cylindrical outer surface 24. Therefore, further detailed description is omitted.

  A highly durable writing instrument structure 1D according to yet another embodiment (Example 5) of the present invention is, as shown in FIG. 12 which is a cross-sectional view comparable to FIG. The rear end support member is configured in the same manner as in Example 4 except that the outer surface structure is different.

  That is, the front end support member 20D of Example 5 and the outer surface 24D of the rear end support member (not shown) are formed in a regular hexagonal cross-sectional shape in which three surfaces are inscribed in the front end side opening portion and the rear end side opening portion of the outer cylinder 10, respectively. However, the only difference is that the front end support member 20C and the outer end surface 24C of the rear end support member of Example 4 are formed in a substantially equilateral triangular cross-sectional shape. Therefore, further detailed description is omitted.

  A highly durable writing instrument structure 1E according to yet another embodiment of the present invention (Example 6) has a cross-sectional shape of an outer cylinder 10E as shown in FIG. 13 which is a cross-sectional view comparable to FIG. The configuration is the same as that of the second embodiment except for the differences.

  That is, the outer cylinder 10E of Example 6 has an outer diameter of 8.6 mm with a thin plate having a thickness of 1 mm and an abutting portion at the both ends in the outer surface having a gap of width bE = 2 mm along the principal axis (X axis) direction. It is formed in a cylindrical shape. Further, an X axis direction width 5 mm and an X axis perpendicular direction width eE are provided at three circumferentially equally-divided portions symmetrical to the X axis of the front end support member 20A of the outer cylinder 10E and the rear end support member not shown. A front end side engagement opening 14E formed in a quadrangular plane shape of 4 mm and a rear end side engagement opening (not shown) are opened, and the front end support member 20A and the rear end support member collar part (or projection part) 23A are entirely formed. The points where the front end side engagement opening 14 and the rear end side engagement opening are respectively fitted, that is, the front end fixing mechanism 16E and the rear end fixing mechanism are formed such that the outer cylinder 10 of the second embodiment is formed in an open triangle shape. It is only different from. Therefore, further detailed description is omitted.

  The highly durable writing instrument structure 1F of still another embodiment (Example 7) of the present invention is, as shown in FIG. 14 which is a cross-sectional view comparable to FIG. A front end fixing mechanism 16E and a rear end fixing mechanism comprising a joint opening 14E, a rear end side engaging opening (not shown), a front end support member 20F, and a flange (or projection) 23A formed on an outer surface 24F of a rear end support member (not shown). The configuration is the same as that of the sixth embodiment except that the number of each is one.

  Therefore, further detailed description is omitted.

  Further, the highly durable writing instrument structure of the present invention can be variously modified by the present inventor in addition to the above-described embodiments. For example, the front end fixing mechanism and the rear end fixing mechanism are respectively configured such that the outer surfaces of the front end support member and the rear end support member are fitted to the front end side engagement opening and the rear end side engagement opening of the outer cylinder. The front end is formed in an arbitrary cross-sectional shape that is inscribed in the outer cylinder on the whole or the entire surface, and the outer surface of the outer cylinder that is inscribed by the front end support member and the rear end support member is caulked at one or a plurality of locations, respectively. The support member and the rear end support member may be modified to be fixed to the outer cylinder. As a result, the manufacturing cost can be further reduced with a simpler structure by omitting the flanges or protrusions of the front end support member and the rear end support member.

  Further, the front end side engagement opening and the rear end side engagement opening of the outer cylinder are not limited to the rectangular plane shape of the above-described embodiment, but are formed into arbitrary plane shapes, and the front end support member and the rear end that are respectively fitted to the planar shape. It is also possible to adopt a modified form such that the shape of the partial flange or protrusion of the support member is matched with the shape of the front end side engagement opening and the rear end side engagement opening.

  The highly durable writing instrument structures 1 to 1F of the present invention have outer cylinders 10 to 10F that are bent from an elastic thin plate into a cylindrical shape having an arbitrary cross section, and a distal end that is fitted in the distal end side opening 11 of the outer cylinder. The supporting members 20 to 20F, the writing tool lead feeding member 40 for feeding the writing tool lead 50, and the rear end side opening 12 of the outer cylinder are fitted into the writing tool lead feeding member to advance and retract the writing tool lead feeding member. Since the rear end support member 30 including the feeding mechanism 34 is configured, it can be easily configured at an inexpensive arbitrary size with a simple configuration with a minimum number of parts and has a degree of freedom in design. It has the effect of providing a highly durable writing instrument structure that can withstand harsh use in factories and construction sites, and is used for daily cooking in general households, shops, companies, factories and construction sites such as ballpoint pens and mechanical pens. Each writing instrument It can be suitably applied.

1, 1A, 1B, 1C, 1D, 1E, 1F; high durability writing instrument structure 10, 10B, 10E, 10F; outer cylinder 11; front end side opening 12; rear end side opening 13, 13, B, 13E; , 14B, 14E; front end side engagement opening 15; rear end side engagement opening 16, 16A, 16B, 16C, 16D, 16E, 16F; front end fixing mechanism 17; rear end fixing mechanism 20, 20A, 20C, 20D, 20F ; Tip support member 21; writing instrument core insertion hole 22; tip writing part hole 23; collar part 23A, 23C; partial collar part or projection part 24, 24A, 24C, 24D, 24F; ) Outer surface (cylindrical surface)
25; tip side outer surface 26; stepped portion 27; tapered surface 30; rear end support member 31; female screw 32; collar portion 33; outer surface (cylindrical surface) of the rear end support member inscribed in the outer cylinder
34; feeding mechanism 40; writing instrument core feeding member 41; male screw 42; rear end gripping portion 43; tip engaging portion 44; latching member mounting hole 50; writing instrument core (for example, a ballpoint pen core)
51; tip writing part 52; ink containing cylinder 60; retaining member a; side length b, bE of equilateral triangle; gap c; opening width in X axis direction (front end side engagement opening and rear end side engagement opening) D1; outer surface diameter (of the front end support member and rear end support member inscribed in the outer cylinder) D2; flange outer diameter e, eE; (of the front end side engagement opening and the rear end side engagement opening) Opening width f: Width of X-axis (in the X-axis direction) X: Main shaft

Claims (9)

A writing instrument structure with a writing instrument core that can be manipulated freely.
An outer cylinder that is bent and formed into an arbitrary cross-section cylindrical shape having an opening that is open at both ends from a thin plate;
A tip support member provided in the tip side opening of the outer cylinder and provided with a tip writing portion hole for projecting and retracting the tip writing portion of the writing instrument core in the X-axis direction of the main shaft;
A writing tool lead feeding member that detachably engages the writing tool lead at its rear end and feeds it in the X-axis direction;
A rear end support member that is fitted in the rear end side opening of the outer cylinder and includes a feeding mechanism that engages with the writing instrument core feeding member and advances and retracts the writing instrument core feeding member in the X-axis direction. High durability writing instrument structure.   2. The front end side fixing mechanism and the rear end side fixing mechanism that restrain and fix each other's movement are respectively provided in the fitting portions of the outer cylinder, the front end support member, and the rear end support member. High durability writing instrument structure as described. The front end side fixing mechanism and the rear end side fixing mechanism are respectively provided with one or a plurality of front end side engaging openings and rear end portions which are respectively provided in the fitting portions of the front end supporting member and the rear end supporting member of the outer cylinder. Side engagement openings;
The outer surface of the outer cylinder inner fitting part of the front end support member and the rear end support member is formed in an arbitrary cross-sectional shape inscribed in the outer cylinder partially or entirely, and the front end side of the inscribed outer surface A flange or a projection formed by expanding the diameter continuously or partially in a stepped manner at a position corresponding to the engagement opening and the rear end side engagement opening;
A part or the whole of the outer surface of the flange or the protrusion is fitted into the front end side engagement opening and the rear end side engagement opening, respectively, and is exposed to the substantially outer surface of the outer cylinder to be engaged. The highly durable writing instrument structure according to claim 2, wherein a front end support member and a rear end support member are fixed to the outer cylinder. The front-end-side fixing mechanism and the rear-end-side fixing mechanism each have an arbitrary cross-sectional shape in which the outer surface of the outer cylinder inner fitting portion of the front-end support member and the rear-end support member is inscribed in part to the outer cylinder partially or entirely. Formed into
The front end support member and the rear end support member are fixed to the outer cylinder by caulking the outer surface of the outer cylinder with which the front end support member and the rear end support member are inscribed in one place or a plurality of places, respectively. The highly durable writing instrument structure according to claim 2. The feeding mechanism is
A male screw formed on the outer surface of the writing instrument core feeding member;
The writing instrument core is formed so as to be inserted through the X-axis of the main shaft of the rear end support member so as to be inserted therethrough, and is configured by a female screw into which a male screw of the writing instrument core feeding member is screwed.
2. The highly durable writing instrument structure according to claim 1, wherein the writing instrument core feeding member screwed into the rear end support member is rotated forward and backward to advance and retreat in the X-axis direction together with the writing instrument core.   6. The height according to claim 1, wherein the outer cylinder has a gap of an arbitrary width along the X-axis direction at both end butting portions in the outer surface where the thin plate is bent. Durable writing instrument structure.   The highly durable writing instrument structure according to any one of claims 1 to 6, wherein the outer cylinder is selectively used from an arbitrary metal having elasticity or a thin plate of stainless steel metal.   The front end support member, the rear end support member, and the writing instrument core feeding member are selectively used from any metal, stainless steel metal, or hard resin material. High durability writing instrument structure as described.   The highly durable writing instrument structure according to any one of claims 1 to 8, wherein a latch member having an arbitrary shape is provided at a rear end of the writing instrument core feeding member.

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