JP5627421B2 - Writing instrument cap and writing instrument - Google Patents

Description

  The present invention relates to a writing instrument cap and a writing instrument.

  For decoration purposes, a writing instrument cap formed by first molding an inner cap integrally provided with a clip and a housing and secondarily molding an outer cap that covers the entire inner cap and has a longer overall length than the inner cap. Is known (see Patent Document 1).

  In addition, for the purpose of making the writing instrument usable as a touch pen that is an input means of a computer or electronic notebook, a writing instrument having a through-hole through which the core of a mechanical pencil can be projected and retracted at the tip is formed of a soft elastic material. A cap-shaped grip for a writing instrument is known (see Patent Document 2).

  Furthermore, for the purpose of decoration, the number of parts is reduced, and a writing instrument cap having a cap body, a clip support portion fixed to the cap body, and a clip comprising a clip piece supported by the clip support portion is known ( (See Patent Document 3).

Japanese Patent Laid-Open No. 11-342697 JP-A-11-198585 Japanese Patent Laid-Open No. 2004-130681

  According to the writing instrument cap of Patent Document 1, the writing instrument cap is formed by two-color molding, but the effect is merely a decorative effect. Therefore, like the conventional writing instrument cap, there is a problem that the cap surface is slippery and is difficult to attach and detach from the writing instrument body. In addition, since the surface is slippery, there is a risk of falling out of a hand holding it or a chest pocket stored therein.

  Since the writing instrument grip of Patent Document 2 is formed of an elastic material, it has a structure that is less slippery than the writing instrument cap of Patent Document 1. However, what is described in Patent Document 2 is merely a grip for making the mechanical pencil usable as a touch pen, and the function as a cap is not considered. That is, the grip for a writing instrument of Patent Document 2 does not include a clip for holding an article such as a document or clothing, a seal rubber for preventing volatilization of ink from a writing part at the tip of the writing instrument, or the like. If the clip is to be attached to this structure, since the entire grip body is formed of an elastic material, the strength of the attachment portion is weakened, and therefore the article cannot be stably held. Further, since the whole is formed of an elastic material, buckling may occur when a force is applied in the axial direction of the writing instrument, such as when falling vertically, and the writing part at the tip of the writing instrument may be damaged.

  Since the writing instrument cap of Patent Document 3 is fitted to the writing tool main body only at the fitting portion provided on the inner wall of the cap main body, the fitting may be loosened when the clip piece is lifted to hold the article. Furthermore, this writing instrument cap is not configured to arrange a seal rubber for preventing volatilization of ink from the writing part at the tip of the writing instrument.

  Accordingly, an object of the present invention is to provide a writing instrument cap and a writing instrument that are not slippery and have sufficient strength and that can stably hold an article with a clip.

  In order to solve the above-described problem, according to the invention described in claim 1, a cap body that is a cylindrical cap body for protecting the pen nib and is formed of an elastic body having a mounting hole formed on a side surface; A clip member comprising: 1 base part and a second base part; at least one beam part connecting the first base part and the second base part; and a clamping part provided on the outer surface of the first base part. A writing instrument cap is provided in which the clip member is provided to the cap body so that the first base and the second base receive the writing tool tip and the clamping part extends out of the cap body through the mounting hole. Is done.

  That is, in the invention described in claim 1, since the cap body is made of an elastic body, the structure is difficult to slip. On the other hand, the strength of the cap body is reduced by making the cap body an elastic body, and the clip member has the first base part, the second base part, and the beam because the attachment of the clip itself is unstable. The cap body is reinforced and eliminated by providing the part. Therefore, the writing instrument cap according to the present invention has an effect that it is difficult to slip and strength is secured, and the article can be stably held by the clip.

  According to a second aspect of the present invention, there is provided a writing instrument cap according to the first aspect of the present invention, wherein the first base and the second base are formed in an annular shape. That is, in the second aspect of the invention, the first base portion and the second base portion are annular, whereby the writing instrument cap is reinforced against a load from the entire circumferential direction.

  According to the invention of claim 3, in the invention of claim 1 or 2, a ball part is formed at the rear end of the clamping part, and the outer peripheral surface of the cap body corresponds to the ball part. There is provided a writing instrument cap in which a concave portion having a shape to be formed is formed, and the ball portion and the concave portion are arranged to face each other. That is, in the invention according to claim 3, since the ball portion and the concave portion have corresponding shapes, articles to be sandwiched such as documents and clothes are also deformed to the same shape, so that it is difficult to come out and more securely. It becomes possible to pinch.

  According to a fourth aspect of the present invention, there is provided a writing instrument cap according to the third aspect of the present invention, wherein the second base portion extends to the longitudinal opening end side beyond the concave portion. That is, in the invention according to claim 4, the cap body is reinforced by the second base portion extending beyond the concave portion of the cap body which is likely to be loaded when an article is sandwiched, so that the cap body can be more securely sandwiched. It becomes like this.

  According to the invention described in claim 5, in the invention described in any one of claims 1 to 4, at least one through-hole communicating with the inside is formed on the outer surface of the writing instrument cap. A writing instrument cap is provided. That is, in the invention according to claim 5, when the writing instrument cap is attached to or detached from the writing instrument body, air can freely enter and exit through the through hole. Therefore, the internal pressure of the writing instrument cap does not increase or decrease, and the writing instrument cap can be smoothly attached and detached. In addition, even if the cap is accidentally swallowed, suffocation can be prevented because it functions as a vent.

  According to the invention of claim 6, in the invention of any one of claims 1 to 5, when held by the inner wall of the tip portion of the cap body, and the writing instrument cap is attached to the writing instrument body, There is provided a writing instrument cap that further includes a seal member that engages with the writing part at the tip of the writing tool to seal the writing part. That is, in the invention described in claim 6, when the writing instrument uses highly volatile ink, the writing part is sealed, so that volatilization of the ink from the writing part can be prevented. . Further, since the adhesion between the seal member and the cap is high, the seal member is difficult to come off.

  Further, according to the invention described in claim 7, in the invention described in any one of claims 1 to 6, the cap main body is a mold having a gate portion other than a location corresponding to the vicinity of the top of the tip. A writing instrument cap that is injection molded using is provided. That is, in the invention according to claim 7, since the remaining gate (or gate mark) is not formed on the top of the cap body, the aesthetics are not impaired, and when the top is used as a handwriting erasing member, There is no worry about hurting.

  Moreover, according to the invention of Claim 8, the writing instrument equipped with the cap of any one of Claims 1 to 7 is provided.

  According to the invention described in each claim, there is a common effect that it is difficult to slip, strength is ensured, and an article can be stably held by a clip.

It is a perspective view of a writing instrument cap. It is a front view of the cap for writing instruments. It is a top view of the cap for writing instruments. It is a bottom view of a writing instrument cap. It is a right view of the cap for writing instruments. It is a right view of the cap for writing instruments equipped with the seal rubber. It is a left view of the cap for writing instruments. It is sectional drawing of the cap for writing instruments. It is a perspective view of the clip member of the cap for writing instruments. It is a perspective view of the cap for writing instruments which extended the 2nd annular part. It is sectional drawing of the cap for writing instruments which extended the 2nd annular part. It is a perspective view of the clip member of the cap for writing instruments which extended the 2nd annular part. It is sectional drawing of the whole writing instrument equipped with the writing instrument cap. It is a perspective view of the cap for writing instruments by another embodiment. It is sectional drawing of the cap for writing instruments shown by FIG. FIG. 15 is a perspective view of a clip member of the writing instrument cap shown in FIG. 14. It is sectional drawing of the whole writing instrument which mounted | wore with the writing instrument cap shown by FIG.

  FIG. 1 is a perspective view of a writing instrument cap. Reference numeral 1 denotes the entire writing instrument cap, 2 denotes a clip member, and 3 denotes a cap body.

  The side surface of the cap body 3 is provided with two through holes 3 a that are arranged symmetrically with respect to the central axis of the writing instrument and communicate with the inside of the writing instrument cap 1 via the clip member 2. By providing the through hole 3a in the cap body 3, the air in the writing instrument cap 1 can freely enter and exit through the through hole 3a when the writing instrument cap 1 is attached to and detached from the writing instrument body. Therefore, the internal pressure of the writing instrument cap 1 does not increase or decrease, and the writing instrument cap 1 can be smoothly attached and detached. Further, the two through holes 3a are arranged symmetrically with respect to the axis, so that the air enters and exits from the two holes evenly and can be attached and detached more smoothly than when the two through holes 3a are not arranged symmetrically. In the present embodiment, there are two through-holes, but one or three or more may be provided, and they may be provided anywhere on the outer surface.

  A plurality of dimples 3b are formed on the outer peripheral surface of the side surface of the cap body 3 for further aesthetic effects and slip prevention. Instead of dimples, a pattern with grooves formed spirally around the outer peripheral surface, a pattern with grooves formed annularly along the outer peripheral surface, or a groove formed in a straight line extending in the longitudinal direction There may be a pattern or the like arranged around the screen.

  2 is a front view of the writing instrument cap 1, FIG. 3 is a plan view thereof, FIG. 4 is a bottom view thereof, FIG. 5 is a right side view thereof, and FIG. 6 is a drawing of the writing instrument cap 1 fitted with a seal rubber 8. 7 is a left side view of the writing instrument cap 1, FIG. 8 is a cross-sectional view of the writing instrument cap 1, and FIG. 9 is a perspective view of a clip member of the writing instrument cap 1. is there.

  In the present specification, the closed end side of the writing instrument cap is the front end or the front side, and the open end side of the writing instrument cap is the rear end or the rear side.

  The clip member 2 will be described with reference to FIGS. The clip member 2 includes a first base portion 4, a second base portion 5, a plurality of beam portions 6 that connect the first base portion 4 and the second base portion 5, and sandwiched integrally formed on the outer peripheral surface of the first base portion 4. It consists of part 7. In the present embodiment, the first base portion 4 and the second base portion 5 are formed in an annular shape, and are hereinafter referred to as the first annular portion 4 and the second annular portion 5.

  The first annular portion 4 has a rear-side diameter larger than the front-side diameter, and has a substantially tapered outer appearance, and is configured to receive the writing instrument body. An inner wall of the first annular portion 4 is formed in a substantially cylindrical shape by a predetermined length inward from the front end portion and the rear end portion, and a region between these cylindrical shapes is formed in a tapered shape. The portion corresponding to the through hole of the cap body 3 is formed with a notch (not shown) having the same shape as the through hole so that the outside and the inside of the writing instrument cap 1 communicate with each other. Yes. Furthermore, a plurality of guide protrusions 4b protruding toward the central axis along the longitudinal direction are provided at equal intervals on the rear cylindrical inner wall portion. The guide protrusion 4b will be described later.

  The second annular portion 5 is formed in a substantially cylindrical shape having an inner diameter and an outer diameter substantially the same as the cylindrical shape on the rear end portion side of the first annular portion 4, and between the first annular portion 4 and the second annular portion 5. Along with the plurality of beam portions 6 to be connected, the cap body 3 on the rear end side from the first annular portion 4 is reinforced.

  At least one beam portion 6 is provided and is rectangular in this embodiment, but may have other shapes such as an ellipse. By providing the beam portions 6, the corresponding cap body 3 portion can be reinforced, and the clip member 2 between the beam portions 6 can be saved and the clip member 2 can be reduced in weight.

  The clamping unit 7 is configured to have elasticity so that an article such as a document or clothing can be clamped between the cap body 3. A ball portion 7 a is integrally formed at the rear end of the clamping portion 7.

  Examples of the material forming the clip member 2 include synthetic resins such as polycarbonate and acrylonitrile / butadiene / styrene. However, in order to prevent breakage when the sandwiching portion 7 is bent, it may be formed using an elastic material, particularly the same elastic material as the cap body described below.

  The cap body 3 is a cylindrical member made of an elastic body whose one end is closed so as to protect the pen tip of the writing instrument, and a mounting hole 3c is formed on a side surface thereof. The first annular portion 4 and the second annular portion 5 of the clip member 2 and the beam portion 6 are disposed in the cap body 3 so that the clamping portion 7 of the clip member 2 extends out of the cap body 3 through the attachment hole 3c. Is provided. That is, the cap body 3 closes the opening on the front side of the first annular portion 4 of the clip member 2 and extends in a cylindrical shape by a predetermined length beyond the second annular portion 5 toward the rear end side in the longitudinal direction. An opening to be inserted is formed.

  A concave portion 3d having a shape corresponding to the ball portion 7a may be formed on the outer peripheral surface of the cap body 3 facing the ball portion 7a of the clip member 2. When the ball part 7a and the recessed part 3d have corresponding shapes, an article to be sandwiched such as a document or clothing is also deformed to the same shape, and is more firmly sandwiched and is less likely to come off. Further, the clip member 2 is formed so that the rear end of the second annular portion 5 extends beyond the concave portion 3d to the rear end side in the longitudinal direction.

  As a material for forming the cap body 3, elastic materials such as rubber materials such as silicone rubber, nitrile rubber, ethylene propylene rubber and ethylene propylene diene rubber, and thermoplastic elastomers such as styrene elastomer, olefin elastomer and polyester elastomer, and the like The mixture of the above elastic materials and the mixture of an elastic material and a synthetic resin are mentioned.

  Since the writing instrument cap 1 of the present embodiment is a ballpoint pen or the like using highly volatile ink, a seal rubber 8 is disposed in the cap body 3 in order to prevent volatilization of ink from the writing part at the tip of the writing instrument. Has been.

  The seal rubber 8 in the present embodiment is made of an elastic body made of an arbitrary elastic material, and as shown in FIG. 8, has a substantially disk shape with circular concave portions coaxially on both surfaces, and has an H-shaped vertical cross-sectional shape. doing. The seal rubber 8 may have other shapes such as a spherical shape.

  Referring to FIG. 8, a plurality of ribs 3 e extending toward the central axis along the longitudinal direction are provided on the inner wall at the front end of the cap body 3, so that the seal rubber 8 is sandwiched while being elastically deformed. The ribs 3e are preferably arranged at equal intervals and three or more.

  When the writing instrument main body is inserted into the writing instrument cap 1 with the seal rubber 8 disposed in the cap main body 3, the writing portion at the tip of the writing instrument engages with the seal rubber 8. That is, when the writing portion presses the central portion of the seal rubber 8, the seal rubber 8 is elastically deformed, and the writing portion is buried in the seal rubber 8. As a result, it is possible to prevent volatilization of ink from the writing unit.

  Further, when the seal rubber 8 is disposed in the cap body 3 in the manufacturing process, since the cap body 3 is made of an elastic body, the cap body 3 is also elastically deformed when the seal rubber 8 is inserted, so that the dimensional tolerance of the seal rubber 8 is somewhat large. However, it can be reliably arranged.

  In the case of a writing instrument that does not require prevention of ink volatilization, the writing instrument cap does not have to include the seal rubber 8 and the rib 3e.

  FIG. 10 is a perspective view of the writing instrument cap 1 with the second annular portion 5 stretched, FIG. 11 is a cross-sectional view of the writing instrument cap 1 with the second annular portion 5 stretched, and FIG. It is a perspective view of the clip member 2 of the cap for writing instruments which extended the 2nd annular part 5. FIG. 10-12 is the same as that of the above-mentioned embodiment except the point which extended the 2nd cyclic | annular part 5 of the cap 1 for writing instruments.

  In the writing instrument cap 1 shown in FIGS. 10 to 12, a flange that is a convex part that extends the second annular part 5 of the clip member 2 to the rear end side in the longitudinal direction and protrudes radially outward at the rear end part. Part 5a is formed. By forming the overall length of the cap body 3 to be shorter by the flange portion 5a, the overall length of the writing instrument cap 1 is the same as that of the above-described embodiment. The outer peripheral surface of the flange portion 5 a is formed so as to form the same surface as the outer peripheral surface in the vicinity of the flange portion 5 a of the cap body 3.

  The flange portion 5a described above has a rectangular cross-sectional shape in the radial direction so that the outer peripheral surface forms the same surface as the other cap body 3 portion, but other cross-sectional shapes, for example, a shape having a circular arc or a polygonal shape. The shape which has a part of may be sufficient.

  By extending the second annular portion 5 of the writing instrument cap 1 to the rear end side in the longitudinal direction from the cap body 3, the opening end portion of the writing instrument cap 1 is reinforced, and bending of the opening end portion is prevented. The user can hold the writing instrument cap 1 firmly. Further, by using a material different from that of the cap body 3, the opening end portion has a texture different from that of the other cap body 3 portions, so that a decorative effect can be obtained.

  FIG. 13 is a cross-sectional view of the entire writing instrument equipped with a writing instrument cap. When the writing instrument body 9 is inserted into the writing instrument cap 1, it is desirable to insert the writing instrument body 9 straight so that the center axis of the writing instrument cap 1 and the center axis of the writing instrument body 9 coincide. However, sometimes the writing instrument main body 9 is not inserted straight into the writing instrument cap 1 and is inserted with the two central axes inclined. For this reason, both may not be able to be fitted well.

  Therefore, as described above, the guide protrusion 4b is provided on the first annular portion 4 of the clip member 2, and the fitting is finally completed even when the writing instrument body 9 is inserted obliquely into the writing instrument cap 1. When it does, it is comprised so that both center axis lines may be guided to the state which corresponded. That is, since the guide protrusion 4b is provided on the first annular portion 4 of the clip member 2, the substantial inner diameter of the first annular portion 4 of the clip member 2 passing through the apex portion of the guide protrusion 4b becomes smaller than the guide protrusion 4b. It becomes smaller than the inner diameter of a normal cap that does not have. Therefore, the looseness (play) between the 1st annular part 4 and the writing instrument main body 9 decreases, and the angle which both center axis lines can form at the time of insertion of the writing instrument main body 9 becomes smaller. Therefore, when the writing instrument main body 9 is inserted obliquely, the frictional resistance between the outer periphery of the writing instrument main body 9 in contact with the guide protrusion 4b of the first annular portion 4 becomes smaller, and the fitting is performed smoothly. .

  Moreover, by having the guide protrusion 4b, a contact area with the outer periphery of the writing instrument main body 9 becomes smaller, and therefore the frictional resistance becomes smaller. The guide protrusion 4b may have other shapes, and the shape and the length in the longitudinal direction of the guide protrusion 4b may not cause poor fitting even when the writing instrument body 9 is inserted obliquely by experiment. Optimized.

  Regarding the fitting of the writing instrument cap 1 with the writing instrument body 9 in the present embodiment, a conventionally known fitting structure is used as the inner wall of the cap body 3 on the rear end side in the longitudinal direction from the second annular portion 5 of the clip member 2. Alternatively, it may be formed on the inner wall of the second annular portion 5 of the clip member 2.

  The guide protrusion 4b is also useful for centering the writing instrument body 9 with respect to the writing instrument cap 1. That is, by having the guide protrusion 4b, the looseness between the first annular portion 4 and the writing instrument main body 9 is reduced as described above, and accurate centering can be performed. Further, since the centering of the writing instrument main body 9 is mainly performed by the guide protrusion 4b provided on the first annular portion 4 of the clip member 2, the centering can be performed regardless of the overall length of the writing instrument cap 1.

  Further, the guide protrusion 4b provides a stable press-fitting when the writing instrument cap 1 is attached to the rear end 9d of the writing instrument body 9 at the time of writing, for example. Therefore, in addition to the relationship between the inner diameter of the first annular portion 4 of the clip member 2 passing through the apex portion of the guide protrusion 4b and the outer diameter of the rear end portion 9d of the writing instrument body 9, the length of the press-fitting distance L in FIG. By designing to, it becomes possible to obtain a desired fitting force. As one guideline for setting the fitting force, in a state where the writing instrument cap 1 is fitted to the rear end portion 9d of the writing instrument body 9, the top portion of the cap body 3 is used as a handwriting erasing member, as will be described later. It is mentioned whether or not the paper is stable when it is rubbed.

  The writing instrument cap 1 can be produced, for example, by two-color molding. When the two-color molding is used, the clip member 2 is first molded first, and then the cap body 3 is secondarily molded to form a writing instrument cap.

  Two-color molding usually uses a mold and core pin for primary molding and secondary molding, and a writing instrument cap is molded around the tip of the core pin, but the core pin is held only at one end during injection molding. In such a case, the core pin may be bent and the like, and it may be impossible to mold into an accurate dimensional shape. That is, at the time of injection molding, the tip portion of the core pin is usually not fixed and is held only by the other end.

  Therefore, at the time of injection molding, a fixing pin protruding from the mold into the cavity contacts and supports the tip of the core pin, thereby fixing the tip of the core pin and preventing bending of the core pin at the time of injection molding. Since the fixed pin is in contact with the tip of the core pin even during injection molding, the molded product has a gap in the shape of the fixed pin. By utilizing this, by selecting the cross-sectional shape of the fixing pin, the cutout portion 4a of the clip member 2 can be formed in the primary molding, and the through hole 3a of the cap body 3 can be molded in the secondary molding. Note that the fixing pin may be provided on the core pin side.

  Since the cap body 3 occupying most of the surface of the writing instrument cap 1 is made of an elastic material, the writing instrument cap 1 and the writing instrument on which the writing instrument cap 1 is mounted are not slippery. Further, since the clip member 2 has the first annular portion 4, the second annular portion 5, and the beam portion 6, the portion that is particularly loaded during the clamping operation is reinforced, so that the strength can be ensured and the article Can be stably held. Therefore, there is an advantage that the risk of dropping from a hand holding a writing instrument or a stored chest pocket is reduced as compared with a conventional writing instrument.

  In the present embodiment, the first base 4 and the first base 5 are formed in an annular shape, but may have any shape that can reinforce the cap body, for example, a shape having a C-shaped cross section. Moreover, in this embodiment, although it had two base parts, three or more may be sufficient, and in that case, these base parts are each connected by the at least 1 beam part.

  In addition, for example, it is an operation that is often performed by the user, but it is also difficult to slip even when the writing instrument body is gripped with the palm, middle finger, ring finger, and little finger, and the writing instrument cap is attached and detached with the index finger and thumb. There is also an advantage that it can be detached. Furthermore, for example, in a ballpoint pen that is vulnerable to vibration and impact, when the writing instrument falls vertically from the top of the cap, the impact on the writing instrument body is mitigated by the writing instrument cap made of an elastic body, and the clip member 2 provides strength. Secured. Thereby, there is also an advantage that the risk of occurrence of problems such as liquid leakage from the writing unit is reduced.

  Furthermore, since most of the writing instrument cap is covered with the elastic body, it can be used as an erasing member for erasing the handwriting drawn by the writing instrument by rubbing with any part covered with the elastic body. it can. For example, the writing instrument cap can be used for erasing handwriting with a pencil, and when used for a writing instrument having ink that changes color due to heat, frictional heat is generated by rubbing the paper surface. The handwriting drawn on can be discolored. Note that the surface roughness of the cap surface is preferably Ra = 0.0009 μm to 0.014 μm. If it is smoother than 0.009 μm, it may slip on the paper surface, and if it is 0.014 μm or more, the paper surface may be caught carelessly. Further, by setting the durometer hardness defined in JIS K6253 D to 35 to 90, it is possible to easily generate frictional heat without damaging the paper surface while improving the rigidity of the entire cap.

  In addition, when using the part covered with the elastic body as an erasing member, the erasing member is usually fitted to the end of the writing instrument body opposite to the writing part, as seen on a pencil with an eraser. Therefore, there is also an advantage that a problem such as detachment of the erasing member does not occur.

  In addition, in the injection molding of the cap body 3, the gate portion that is the entrance to the cavity of the mold is not the top of the cap body 3, but the side surface, for example, the cap body is applied to the writing surface or the paper surface even if the cap body is inclined at 45 °. By disposing at a position that does not contact, the top surface can have a smooth appearance. Further, when the top portion is used as an erasing member, it can be used without problems such as damage to the paper surface due to a so-called gate residue (or gate trace).

  Next, a writing instrument cap according to another embodiment will be described. 14 is a perspective view of the writing instrument cap, FIG. 15 is a sectional view of the writing instrument cap shown in FIG. 14, and FIG. 16 is a perspective view of the clip member of the writing instrument cap shown in FIG. FIG. 17 is a sectional view of the entire writing instrument equipped with the writing instrument cap shown in FIG.

  Reference numeral 10 denotes the entire writing instrument cap, reference numeral 12 denotes a clip member, and reference numeral 13 denotes a cap body. In the following description, differences from the writing instrument cap 1 according to the first embodiment are mainly described, and configurations and effects that are not mentioned are the same as those of the first embodiment.

  An annular step 13g inclined with respect to the central axis of the cap body 13 is provided on the side surface of the cap body 13 for aesthetic effects.

  The clip member 12 includes a base portion 14 and a sandwiching portion 15 formed integrally with the outer peripheral surface of the base portion 14. In the present embodiment, the base portion 14 is formed in an annular shape, and is hereinafter referred to as an annular portion 14.

  The annular portion 14 has a rear-side diameter larger than the front-side diameter, has a substantially tapered outer appearance, and is configured to receive the tip of the writing instrument. An inner wall of the annular portion 14 is formed in a substantially cylindrical shape by a predetermined length inward from the front end portion and the rear end portion, and a region between these cylindrical shapes is formed in a tapered shape. Further, a plurality of guide protrusions 14b protruding toward the central axis along the longitudinal direction are provided at equal intervals on the rear cylindrical inner wall portion. Since the features and effects of the guide protrusion 14b are the same as those of the guide protrusion 4b in the writing instrument cap 1 of the above-described embodiment, the description thereof is omitted.

  The clamping unit 15 is configured to have elasticity so that an article such as a document or clothing can be clamped between the cap body 13.

  Examples of the material forming the clip member 12 include synthetic resins such as polycarbonate and acrylonitrile / butadiene / styrene. However, it may be formed using an elastic material, in particular, the same elastic material as that of the cap body described below, in order to prevent breakage when the sandwiching portion 15 is bent.

  The cap body 13 is a cylindrical member made of an elastic body whose one end is closed so as to protect the pen tip of the writing instrument, and an attachment hole 13c is formed on the side surface thereof. An annular portion 14 of the clip member 12 is disposed in the cap body 13, and a holding portion 15 of the clip member 12 is provided so as to extend out of the cap body 13 through the attachment hole 13c. That is, the cap body 13 closes the opening on the front side of the annular portion 14 of the clip member 12 and extends in a cylindrical shape from the opening on the rear side by a predetermined length to form an opening into which the writing instrument body is inserted. The attachment hole 13c is formed to be larger than the attachment hole 3c in the above-described embodiment, and a part of the annular portion 14 is exposed, thereby producing an aesthetic effect.

  As a material for forming the cap body 13, elastic materials such as rubber materials such as silicone rubber, nitrile rubber, ethylene propylene rubber and ethylene propylene diene rubber, and thermoplastic elastomers such as styrene elastomer, olefin elastomer and polyester elastomer, and the like The mixture of the above elastic materials and the mixture of an elastic material and a synthetic resin are mentioned.

  The writing instrument cap 10 may have a seal rubber 16 and a rib 13e that holds the seal rubber 16. The characteristics and effects of the seal rubber 16 and the rib 13e are the same as the seal rubber 6 and the rib 3e in the writing instrument cap 1 of the above-described embodiment. The description is omitted because it is similar.

  In the present embodiment, the base portion 14 is formed in an annular shape, but may have any shape that can reinforce the cap body, for example, a shape having a C-shaped cross section. In addition, regarding the fitting of the writing instrument cap 10 with the writing instrument body in the present embodiment, it is possible to adopt the same structure as in the first embodiment. However, a conventionally known fitting structure as shown in FIG. 17 is formed on the inner wall of the cap body 13 or the inner wall of the annular portion 14 of the clip member 12 on the rear end side in the longitudinal direction from the annular portion 14 of the clip member 12. May be.

  As a matter of course, the annular portion 14 of the clip member 12 of the writing instrument cap 10 according to the present embodiment may also have a structure having the flange portion 5a at the opening end as shown in FIGS. Good.

DESCRIPTION OF SYMBOLS 1 Writing instrument cap 2 Clip member 3 Cap main body 3c Mounting hole 4 1st annular part, 1st base part 5 2nd annular part, 2nd base part 6 Beam part 7 Clamping part

Claims (8)

  A cylindrical cap main body for protecting the pen nib, which is made of an elastic body having attachment holes formed on the side surfaces, and between the first base portion and the second base portion, and between the first base portion and the second base portion. A clip member having at least one beam portion to be connected and a sandwiching portion provided on the outer surface of the first base portion, wherein the first base portion and the second base portion receive the tip of the writing instrument and the sandwiching portion; A writing instrument cap in which the clip member is provided to the cap body so that the clip member extends outside the cap body through the mounting hole.   The writing instrument cap according to claim 1, wherein the first base and the second base are formed in an annular shape.   A ball portion is formed at a rear end of the clamping portion, a concave portion having a shape corresponding to the ball portion is formed on an outer peripheral surface of the cap body, and the ball portion and the concave portion are arranged to face each other. The cap for writing instruments as described in 1 or 2.   The writing instrument cap according to claim 3, wherein the second base portion extends beyond the concave portion toward the opening end side in the longitudinal direction.   The writing instrument cap according to any one of claims 1 to 4, wherein at least one through-hole communicating with the inside of the outer surface of the writing instrument cap is formed.   6. The seal member according to claim 1, further comprising a seal member that is held by an inner wall of the tip end portion of the cap body and seals the writing portion by engaging the writing portion at the tip end of the writing instrument when the writing instrument cap is attached to the writing instrument body. A writing instrument cap according to any one of the above.   The writing instrument cap according to any one of claims 1 to 6, wherein the cap body is injection-molded by using a mold having a gate portion other than a location corresponding to the vicinity of the top of the tip.   A writing instrument equipped with the cap according to any one of claims 1 to 7.

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