JP2011056681A - Cap for writing utensil - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cap for writing utensil, which overcomes the conventional problem that the attaching/detaching of the cap itself are not easy and the original function of the cap is marred by reducing the fitting force of the cap for a cap-type writing utensil only during attachment and detachment. <P>SOLUTION: The cap for writing utensil is constituted of a cap body and a slide-over fitting protrusion which is movable radially formed on the cap body side. In addition, the sliding-over fitting protrusion is arranged on a flexible support member. Further, a movement regulating/deregulating member which regulates and deregulates the movement of the sliding-over fitting protrusion in the radial direction, is optionally operated. Thus, the fitting force can be reduced by deregulating the movement of the protrusion during attachment and detachment. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a cap of a cap-type writing instrument, and more particularly to a writing instrument cap that can be reliably attached to a writing instrument and is easy to remove.

  Conventionally, an invention for facilitating attachment / detachment of a cap in a cap-type writing instrument has been made. For example, the invention disclosed in Patent Document 1 discloses a cap that is configured to be detachable from a writing instrument by over-fitting fitting, and has caps that are provided with unevenness radially when viewed from the end face of the cap. In the case of this cap, the abdomen of the finger that picks up the cap enters the recess of the cap, so that it can be removed with a light force when removing the cap.

JP 2008-55740 A

  In the invention disclosed in Patent Document 1, the finger can be removed with a light force by strengthening the catch of the finger. However, in reality, there is no change in the fitting force of the cap and the writing instrument when it is passed over, and it becomes difficult to slip because the finger is firmly caught. In the operation of pulling out while turning the cap, the force is easily applied, but the force cannot be removed with a weak force, and it is still difficult for an elderly person with a weak force to remove the force. Furthermore, since no measures are taken when attaching the cap, it is necessary to attach it with a strong force.

  The present invention provides a over-fitting fitting protrusion provided on a shaft tube of the cap-type writing instrument to fix the cap main body in the cap-type writing instrument, and provided on the cap main body so as to face the over-fitting fitting protrusion. The movement-over fitting protrusion formed to be movable in a direction away from the over-fitting fitting protrusion, and the movement of the riding-over fitting protrusion in the direction away from the over-fitting fitting protrusion, And a restricting / releasing member formed so that the release can be arbitrarily selected.

  According to the present invention, it is possible to temporarily weaken the fitting force at the time of attaching / detaching the cap that is attached / detached by the over-fitting. That is, when the cap is attached / detached, the movement of the ride-over fitting protrusion provided on the cap side is released by the restriction / release member. Then, the overpass fitting protrusion moves in a direction away from the overpass fitting protrusion provided on the shaft tube side. Therefore, it is possible to release the fitting force generated when the ride-over fitting protrusion gets over the riding-over fitting protrusion. Then, after the cap is mounted, the movement of the ride-on fitting protrusion is restricted by the restriction / release member, so that the fitting force is restored so that the cap is not accidentally removed due to carrying of the writing instrument, etc. it can.

1 is a longitudinal sectional view schematically showing a first embodiment of the present invention. (A) shows a state where the movement fitting of the overpass fitting protrusion is restricted (a state where the cap is fitted), and (b) shows a state where the movement restriction of the overpass fitting protrusion is released (let the cap be removed). State). It is the figure which looked at the cap main body from the II direction of Fig.1 (a). It is a perspective view in the 2nd example which materialized the 1st example of the present invention. It is a longitudinal cross-sectional view in 3rd Example of this invention. (A) shows a state where the movement fitting of the overpass fitting protrusion is restricted (a state where the cap is fitted), and (b) shows a state where the movement restriction of the overpass fitting protrusion is released (let the cap be removed). State).

  Embodiments of the present invention will be described below with reference to the drawings. In the following description, the forward direction refers to the direction of the pen tip side.

  FIG. 1 is a diagram schematically showing an embodiment of the present invention. (A) shows the state in which the cap (cap 3 for writing instruments) which concerns on this invention is fitted, and (b) shows the state which is going to remove the cap (cap 3 for writing instruments).

  The cap-type writing instrument 1 is composed of a writing instrument body 2 and a writing instrument cap 3 according to the present invention. In this embodiment, the writing instrument body 2 is an oil-based felt pen, and the shaft cylinder 2a is formed in a cylindrical shape, and a pen tip 2b is provided at the front end. The shaft cylinder 2a of the writing instrument main body 2 is provided with a to-be-ridden fitting protrusion 2c. In the present embodiment, the overpass fitting fitting protrusion 2c is formed in an annular shape.

  In this embodiment, the shaft cylinder 2a and the writing instrument cap 3 are formed by injection molding using a resin as a material.

  The writing instrument cap 3 has a cap body 4 formed in a bottomed cylindrical shape. On the radial side surface 4a of the cap body 4, a pair of slit-shaped notches (a length of about a half of the length of the cap body 4 (radial side surface 4a)) from the rear end toward the front ( 4b, see FIG. 2), and a support 4c is formed between the notches (4b). The support 4c has flexibility in combination with the properties of the resin material to be formed. Further, a ride-over fitting projection 4d is provided on the inner surface of the support portion 4c (in other words, the surface of the support portion 4c facing the over-fitting fitting projection 2c). The support portion 4c is provided at two locations facing the radial side surface 4a.

  On the other hand, an air tight portion 4f formed in a cylindrical shape is provided on the inner surface of the bottom portion (in other words, the front end portion) 4g of the cap body 4. The air tight portion 4f is in close contact with the outer periphery of the tip end of the barrel 2a to which the pen tip 2b is attached in the state where the writing instrument cap 3 (cap body 4) is attached, thereby sealing the space around the pen tip 2b. Prevent volatilization.

  Further, from the outer surface of the bottom portion (in other words, the front end portion) 4g of the cap body 4, a guide portion 4h is provided for guiding the regulating / releasing member 5 in the axial direction (in other words, the front-rear direction). On the guide portion 4h, guide pieces 4h1 are erected so as to face each other at a predetermined interval. The cross-sectional shape of the guide piece 4h1 is formed in an arc shape corresponding to a round hole 5b1 of the restriction / release member 5 described later. At the front end of the guide portion 4 h (guide piece 4 h 1), a restriction protrusion 4 h 2 that defines the moving end of the front end of the restriction / release member 5 protrudes toward the outer periphery of the cap body 4. The cross-sectional shape of the restricting protrusion 4h2 may be any shape as long as the movement of the restricting / releasing member 5 can be restricted. However, in consideration of passing the restricting protrusion 4h2 (guide portion 4h) through the round hole 5b1 of the disc-like portion 5b that becomes the front end wall of the restricting / releasing member 5 described later during assembly, the cross-sectional shape of the guide piece 4h1 Similarly, the cross-sectional shape is preferably an arc shape.

  On the other hand, a regulating / releasing member 5 formed in a substantially bottomed cylindrical shape is provided on the outer periphery of the cap body 4. The inner surface of the restricting / releasing member 5 in the radial side surface 5a is close to or in contact with the outer surface of the support portion 4c. The front end of the regulating / releasing member 5 is provided with a disk-shaped portion 5b formed in a disk shape having a round hole 5b1 at the center.

  The aforementioned guide part 4h passes through the round hole 5b1 of the disk-like part 5b. Therefore, the inner surface 5b11 of the round hole 5b1 is formed to be movable in the front-rear direction along the guide piece 4h1 of the guide portion 4h. That is, the regulating / releasing member 5 is guided in the front-rear direction by the guide portion 4 h, the front end is regulated by the regulating projection 4 h 2, and the rear end is regulated by the outer surface of the bottom portion 4 g of the cap body 4.

  The operation of this embodiment will be described. When the writing instrument cap 3 is removed from the state in which the writing instrument cap 3 is attached to the writing instrument body 2 (the state shown in FIG. 1A), the writing instrument cap 3 is pulled forward with a predetermined force. In the state of FIG. 1 (a), that is, when the regulating / releasing member 5 is located at the rear end, the force (that is, the fitting force) that the over-fitting fitting projection 4d gets over the over-fitting fitting projection 2c is strong. It has become. This is because the outward movement of the support portion 4c on which the ride-over fitting protrusion 4d is supported is restricted by the inner surface of the restricting / releasing member 5 in the radial side surface 5a.

  Therefore, in the present invention, it is possible to easily pull out the writing instrument cap 3 by moving the regulating / releasing member 5 to the front end. That is, when the restriction / release member 5 is moved to the front end, the outer periphery of the radial side surface 4a of the cap body 4 is opened from the rear end of the cap body 4 forward by the movement distance of the restriction / release member 5; Become. Therefore, the outer periphery of the support portion 4c is also open, and the support portion 4c has flexibility, so that the restriction on the outward movement is released. Accordingly, when the writing instrument cap 3 is pulled forward and the overpass fitting protrusion 4d gets over the overpass fitting protrusion 2c, the support portion 4c moves outward (in other words, in a direction away from the overpass fitting protrusion 4d). To do. The fitting force in this case (the force required for the ride-over fitting protrusion 4d to get over the ride-over fitting protrusion 2c) is a state in which the outward movement of the support portion 4c is restricted (after the restriction / release member 5). It is much smaller than that at the end).

  In other words, in the present invention, when the writing instrument cap 3 is removed, the fitting force itself can be reduced, so that the writing instrument cap 3 can be easily removed even by an elderly person or a younger person having a weak force. Further, when the writing instrument cap 3 is attached to the writing instrument body 2, it can be attached with a weak fitting force by moving the regulating / releasing member 5 to the front end in the same manner. Furthermore, if the regulating / releasing member 5 is positioned at the rear end, the outward movement of the support portion 4c is regulated, so that the writing instrument cap 3 is firmly attached, and the writing instrument cap 3 is unexpectedly moved. There is no such thing as going off.

  In the present embodiment, even when the regulating / releasing member 5 is moved to the front end, a force at the time of air tight with the front end portion of the shaft cylinder 2a of the air tight portion 4f (fitting force of the air tight portion) is generated. However, in general, the fitting for fitting the writing instrument cap 3 to the writing instrument main body 2 (fitting by the over-fitting fitting projection 4d and the over-fitting fitting projection 2c) is strengthened, and the pen tip 2b is hermetically sealed. Is set to be weaker than the former, and the ratio is 9-7: 1-3. Therefore, only when the writing instrument cap 3 is attached or detached, the effect of the present invention for reducing the fitting force itself by the overpass fitting protrusion 4d and the overpass fitting protrusion 2c is high.

Further, even when the regulating / releasing member 5 is moved to the front end, a required force is required when the ride-over fitting protrusion 4d gets over the ride-over fitting protrusion 2c. However, as described above, the fitting force generated by the elasticity of elasticity applied to the support portion 4c can be set much weaker than the normal fitting force.
Further, the fitting force when the ride-over fitting protrusion 4d gets over the ride-over fitting protrusion 2c can be weakened if the regulating / releasing member 5 moves forward to some extent. That is, when the movement of the outer periphery of the support portion 4c is completely restricted (in other words, when the restriction / release member 5 is located at the rear end), the restriction / release member 5 is moved forward slightly, so The fitting protrusion 4d can move, and therefore the fitting force by the overpass fitting protrusion 4d and the overpass fitting protrusion 2c is reduced. Further, if the rear end of the regulating / releasing member 5 is advanced beyond the over-ride fitting protrusion 2c, the fitting force by the over-ride fitting protrusion 4d and the over-ride fitting protrusion 2c is further reduced. More preferably, if the rear end of the restricting / releasing member 5 advances beyond the front end 4b1 of the notch 4b, the fitting force by the overpass fitting projection 4d and the overpass fitting fitting 2c is supported. Only due to the flexibility of the portion 4c, the fitting force is most reduced.

  In the present embodiment, the writing instrument body 2 is an oil-based felt pen, but other types of cap-type writing instruments can also be applied. Depending on the type of writing instrument, it is not necessary to provide the air tight portion 4f unless it is necessary.

  A second embodiment of the present invention is shown in FIG. The present embodiment is a writing instrument cap 30 that is a more specific example of the first embodiment described above. In FIG. 3, the writing instrument body is not shown. Also, the left side of the figure is the tip side (pen nib side).

  The writing instrument cap 30 includes a cap body 40 formed in a cylindrical shape, and a regulation / release member 50 formed in a cylindrical shape on the outer periphery of the cap body 40. Also in this embodiment, both are configured by injection molding using a resin material. On the radial side surface 40a of the cap body 40, a notch 40b is provided in a substantially U shape in the vicinity of the rear end portion with the U-shaped opening facing forward. A support portion 40c is formed in a tongue-like shape by the cutout portion 40b. The support part 40c has flexibility. A ride-over fitting protrusion (not shown) is provided on the inner surface of the support portion 40c. Similar to the first embodiment, the ride-over fitting protrusion attaches the writing tool cap 30 to the writing tool body by the action of the over-ride fitting protrusion provided on the shaft cylinder of the writing tool body (not shown).

  A sliding contact projection 40c1 is provided in a protruding shape on the outer surface of the end of the support portion 40c. The cross-sectional shape of the sliding contact projection 40c1 is formed corresponding to the inner peripheral surface diameter of a large inner diameter portion 50a1 of a regulating / releasing member 50 described later. Therefore, the outer surface of the sliding contact projection 40c1 is close to or in contact with the inner peripheral surface of the large inner diameter portion 50a1, and both are in sliding contact.

  In addition, the U-shaped notch 40b, the support part 40c and the sliding contact protrusion 40c1 formed thereby are provided in two opposite positions (one side is not shown).

  A guide portion 40 h is erected at the front end of the cap body 40. The guide portion 40h is configured by a pair of guide pieces 40h1 having a predetermined interval. The cross section of the guide piece 40h1 is formed in an arc shape. The arc shape of the cross section of the guide piece 40h1 corresponds to the inner surface 50b11 of the round hole 50b1 formed in the disc-like portion 50b provided in the restriction / release member 50 described later, and the round hole 50b1 (that is, the restriction / release member 50) is formed. Guides in the front-rear direction. And the regulation protrusion 40h2 is provided in the front end of the guide piece 40h1. The rear end surface of the restricting protrusion 40h2 rises vertically outward from the outer surface of the guide piece 40h1, and inclines forward through a predetermined parallel surface. Therefore, when the writing instrument cap 30 is assembled, the round hole 50b1 can be guided by the inclined surface, so that the guide piece 40h1 can be easily inserted.

  Further, on the outer surface of the cap main body 40, locking projections 40i are provided at two opposing positions with a phase difference of 90 degrees from the support portion 40c in the radial direction. The locking projection 40i is formed in a hemispherical shape.

  The restricting / releasing member 50 formed in a cylindrical shape on the outer periphery of the cap body 40 is provided with a disk-like portion 50b having a round hole 50b1 at a front portion on the inner surface of the radial side surface 50a. It is guided by 40h1. In the front-rear direction guide of the regulating / releasing member 50, the rear end of movement is regulated by the outer surface of the bottom 40g of the cap body 40, and the front end of movement is regulated by the rear end vertical surface of the regulating projection 40h2.

  A large inner diameter portion 50a1 is formed behind the inner surface of the regulating / releasing member 50 over a predetermined distance from the rear end. The large inner diameter portion 50a1 is spaced apart from the radial side surface 40a of the cap body 40 by a predetermined distance, but is close to or in contact with the outer surface of the sliding contact projection 40c1 of the support portion 40c, and is formed in a sliding contact state. ing. Then, an annular protrusion 50a2 is formed in a protruding shape continuously from the large inner diameter portion 50a1 at a portion from the front of the large inner diameter portion 50a1. The annular protrusion 50a2 is formed in an annular shape. A locking recess 50a3 formed by the annular protrusion 50a2 and the front end of the large inner diameter portion 50a1 is formed in an annular shape. The aforementioned locking projection 40i can be engaged with this locking recess 50a3. Therefore, the locking projection 40i and the locking recess 50a3 constitute a fixing means for fixing the regulating / releasing member 50.

  The operation of this embodiment will be described. In this embodiment, the outward movement of the support portion 40c is restricted by the sliding contact between the large inner diameter portion 50a1 of the regulating / releasing member 50 and the outer surface of the sliding contact projection 40c1. In other words, when the writing instrument cap 30 is attached to a writing instrument main body (not shown), movement in a direction away from the over-fitting fitting protrusion provided on the writing instrument main body is restricted. When the restricting / releasing member 50 is moved forward until it comes into contact with the restricting protrusion 40h2, the rear end of the restricting / releasing member 50 is positioned in front of the sliding contact protrusion 40c1. At this time, the sliding contact projection 40c1 is completely exposed, and the outward movement of the sliding contact projection 40c1 (support portion 40c) is not restricted. Here, since the overpass fitting protrusion is provided on the inner surface of the support portion 40c, and the overwhelmed fitting protrusion is provided on the writing instrument body to be attached, the attachment / detachment of the writing instrument cap 30 can be performed with a weak force as in the first embodiment. Can be operated.

  Furthermore, in the present embodiment, since the locking projection 40i is locked to the locking recess 50a3, the fixing means is configured. Therefore, when the writing instrument cap 30 is mounted, the regulating / releasing member 50 is unexpectedly moved. This prevents the writing instrument cap 30 from moving forward and coming off. The force (fitting force) when the locking projection 40i gets over the annular projection 50a2 is set to be very weak compared to the fitting force of the over-fitting fitting projection and the over-fitting fitting projection.

  Further, the disc-like portion 50 b of the regulating / releasing member 50 is provided in a predetermined distance from the front end portion as compared with the first embodiment. In other words, it can be said that the cylindrical side wall is erected from the disc-like portion 50b. Thereby, it is not necessary to expose the whole guide part 40h (guide piece 40h1) outside, and the improvement of aesthetics can be aimed at.

  In this example, the air tight part (4f) of the first example is not provided.

  FIG. 4 shows a third embodiment of the present invention. (A) shows a state in which the cap according to the present invention (writing instrument cap 130) is fitted into the writing instrument body (120), and (b) shows the cap (writing instrument cap 130) being removed from the writing instrument body (120). Indicates the state that is about to occur. In the present embodiment, compared with the first and second embodiments, the structure of the writing instrument cap 130 that covers the guide portion (140h) and is not exposed to the outside is realized. Further, the writing instrument cap 130 in the present embodiment is composed of a cap body 140 and a regulating / releasing member 150, and both are configured by injection molding using a resin material, as in the first and second embodiments.

  In addition, the writing instrument main body 120 shown in a present Example is an oil-based felt pen similarly to 1st Example. The writing instrument main body 120 includes a cylindrical barrel 120a formed in a cylindrical shape and a pen tip 120b provided at the front end of the cylindrical barrel 120a. The shaft cylinder 120a is formed with an overhang fitting protrusion 120c in an annular shape.

  The cap body 140 is formed in a bottomed cylindrical shape. Similar to the first embodiment (see FIG. 2), a slit-shaped notch (140b) having a predetermined length from the rear end is provided on the radial side surface 140a of the cap body 140 so as to face each other. And the support part 140c is formed between a pair of notch parts (140b). The support part 140c has flexibility. An overpass fitting protrusion 140d is provided on the inner peripheral surface of the support portion 140c. The writing tool cap 130 is fixed to the writing tool main body 120 by the ride-over fitting protrusion 140d and the over-ride fitting protrusion 120c engaging in getting over.

  Further, a sliding contact projection 140c1 is provided on the outer peripheral surface of the support portion 140c. The sliding contact protrusion 140c1 is in close proximity to or in contact with a sliding contact inner diameter surface 150a11 of a regulating / releasing member 150, which will be described later, and is in sliding contact with the sliding contact inner diameter surface 150a11. Further, in the large inner diameter portion 150a1 formed near the rear end opening of the regulating / releasing member 150, the sliding contact with the sliding contact projection 140c1 is released (released).

  In addition, the support part 140c is provided in two places facing the radial direction side surface 140a.

  The front side of the cap body 140 is provided with a guide portion 140h that is formed in a cylindrical shape with the outer diameter being reduced by one step. A concave portion 140j is formed in the guide portion 140h in an annular shape. Therefore, the front end of the guide part 140h is formed with a regulation protrusion 140h2 in the shape of an annular protrusion.

  Further, on the side opposite to the guide portion 140h, an air tight portion 140f is erected in a cylindrical shape toward the rear. The air tight portion 140f is in close contact with the vicinity of the tip portion of the shaft cylinder 120a where the pen tip 120b is provided, and forms a sealed space. This sealed space is formed from the inside of the guide portion 140h to the inner peripheral space of the air tight portion 140f.

  On the outer periphery of the cap body 140, a regulating / releasing member 150 is formed in a bottomed cylindrical shape. The inner peripheral surface of the radial side surface 150 a of the regulating / releasing member 150 is formed with a sliding contact inner diameter surface 150 a 11 having a length equivalent to the length in the front-rear direction of the radial side surface 140 a of the cap body 140. The sliding contact inner diameter surface 150a11 is formed so as to be in close contact with or in contact with the outer surface of the sliding contact projection 140c1 described above.

  On the rear side of the slidable inner diameter surface 150a11 (in other words, in the vicinity of the inner peripheral rear end of the radial side surface 150a), a large inner diameter portion 150a1 formed with a larger inner diameter than the slidable inner diameter surface 150a11 is formed continuously with the slidable inner diameter surface 150a11. Has been. The large inner diameter portion 150a1 has a predetermined distance from the outer surface of the sliding contact projection 140c1.

  Further, a small diameter portion 150c having a reduced diameter corresponding to the above-described guide portion 140h is formed in front of the sliding contact inner diameter surface 150a11 (in other words, the inner peripheral front portion of the radial side surface 150a). The inner diameter of the small diameter portion 150c is close to or in contact with the outer surface of the restricting protrusion 140h2. An annular protrusion 150c1 that is close to or in contact with the recess 140j is formed in an annularly protruding manner at the rear end of the small diameter portion 150c (in other words, the connection portion with the sliding contact inner diameter surface 150a11).

  The operation of this embodiment will be described. When the writing instrument cap 130 is attached to the writing instrument main body 120 (the state shown in FIG. 4A), the sliding contact protrusion 140c1 moves outward (in other words, fits over the ride) by the sliding contact inner diameter surface 150a11. Movement in a direction away from the mating protrusion 120c) is restricted. Therefore, the fixed state of the strong cap is formed.

  Therefore, the restricting / releasing member 150 is moved to the front end (in other words, until the annular protrusion 150c1 contacts the restricting protrusion 140h2). Then, the outer periphery of the sliding contact protrusion 140c1 is completely stored in the large inner diameter portion 150a1. That is, the movement restriction to the outside of the support portion 140c (in other words, the direction away from the over-fitting fitting protrusion 120c) is released. Then, similarly to the first and second embodiments, the fitting force between the overpass fitting protrusion 140d and the overpass fitting protrusion 120c is reduced, and the writing instrument cap 130 can be easily removed.

  Similarly, when attaching the writing instrument cap 130, it can be easily attached with a weak force.

  Although not shown in this drawing (FIG. 3), a fixing means may be provided in order to prevent the regulation / release member 150 from moving back and forth unexpectedly. For example, an uneven relationship (for example, in the second embodiment) having an appropriate engagement relationship with the outer peripheral surface of the cap body 140 (radial side surface 140a) corresponding to the sliding contact inner diameter surface 150a11, the small diameter portion 150c corresponding to the guide portion 140h, and the like. The engaging projection 40i and the annular projection 50a2) can be used.

  As mentioned above, although Example 1-3 of this invention was demonstrated in detail, this invention is not limited to this, In the range which does not change the summary of this invention, it can change suitably.

  For example, by forming the cap body (4, 40, 140) from a thin metal, flexibility can be imparted to the support portions (4c, 40c, 140c) by the same structure as in the present embodiment. Further, the overpass fitting protrusion may be formed so as to be movable away from the overpass fitting protrusion using a coil spring or the like.

DESCRIPTION OF SYMBOLS 1 Cap type writing instrument 2a Shaft cylinder 2c Overpass fitting fitting 3 Writing instrument cap 4 Cap main body 4b Notch part 4c Support part 4d Overcoming fitting protrusion 4h1 Guide piece 4h2 Restriction protrusion 5 Restriction / release member 30 Writing tool cap 40 Cap body 40b Notch 40c Support 40h1 Guide piece 40h2 Restriction protrusion 40i Locking protrusion 50 Restriction / release member 50a3 Locking recess 120 Writing instrument body 120a Shaft cylinder 120c Overpass fitting protrusion 130 Writing instrument cap 140 Cap body 140a Radial side surface 140b Notch portion 140c Support portion 140d Override fitting protrusion 140h Guide portion 140h2 Restriction protrusion 150 Restriction / release member

Claims (5)

The over-fitting fitting protrusion provided on the shaft cylinder of the cap-type writing instrument to fix the cap body in the cap-type writing instrument;
A crossover fitting protrusion formed on the cap body so as to face the overcrowded fitting protrusion and formed to be movable in a direction away from the overcrowded fitting protrusion,
A restriction / release member formed so that the movement restriction or release can be arbitrarily selected for movement in a direction away from the overpass fitting protrusion.
A writing instrument cap characterized by comprising: The cap body is formed in a cylindrical shape,
2. The writing instrument cap according to claim 1, wherein the regulating / releasing member is formed in a cylindrical shape on an outer periphery of the cap body. 3. The writing instrument cap according to claim 2, wherein the regulating / releasing member is formed to be movable along an axial direction of the cap-type writing instrument. 4. The writing instrument cap according to claim 3, wherein the restricting / releasing member has fixing means for fixing at a position for restricting movement of the overpass fitting protrusion in a direction away from the overpass fitting protrusion. . 5. The writing instrument cap according to claim 1, wherein the ride-over fitting protrusion is formed with flexibility by a notch provided on a side surface of the cap.

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