JP2012245710A - Writing instrument with cap - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a writing instrument with a cap in which the cap can be easily removed by pressing operation when in use, and in addition the cap can be prevented from coming off when in non-use.SOLUTION: In the writing instrument with the cap, a deformation part 21a that can be deformed into the cap by pressing operation from the outside, is prepared on a peripheral wall of the cap 20, the cap 20 is made to be removed from the shaft tube 10 by pressing the shaft tube 10 by the deformation part 21a when deformed to inside the cap. The outer surface of the deformation part 21a is prepared in substantially the same surface with the outer surface of the cap peripheral wall or dented rather than the outer surface of the cap peripheral wall, escape concave parts 21b and 21c which are dented into the cap rather than the outer surface of the deformation part 21a are provided on the outer surface adjacent to the deformation part 21a, and a finger f for pressing operation is made to be escaped by the escape concave parts 21b and 21c.

Description

  The present invention relates to a writing instrument with a cap including a correction pen.

Conventionally, a writing instrument with a cap has a problem that ink is scattered due to an impact when the cap is removed, and the problem is particularly serious in a direct liquid writing instrument having a relatively large ink discharge amount. Therefore, it is conceivable to set the fitting force between the cap and the writing instrument body weak, but in this case, the cap may be removed carelessly, or ink that has flowed out due to the influence of vibration, temperature, etc. There is concern about leakage from the fitting portion between the cap and the writing instrument body.
In order to solve such a problem, for example, in the invention described in Patent Document 1, on the side surface of the cap (1), an operating body (14) that can be bent inward, and a free end of the operating body (14) A button part (15) projecting outward on the side, and when the button part (15) is pressed and the operating body (14) is bent inward, the inner surface of the operating body (14) is The cap (1) is pushed forward by being brought into sliding contact with the inclined portion (12) on the front end side of the main body (2).

By the way, according to the prior art, when the writing instrument comes into contact with the inner surface or the like of the packing box due to vibration during transportation, the button (15) is pressed by the contact and the cap (1 ) May come off.
Therefore, it is proposed to omit the portion (button part (15)) protruding from the operating body (14) so that the operating body (14) is not deformed by the vibration or the like.
However, when the projecting portion (button part (15)) is omitted as described above, the operability when the operating body (14) is pressed and deformed inward is significantly impaired, and thus a contrivance is required.

JP-A-9-1981

  The present invention has been made in view of the above-described conventional circumstances, and the problem is that the cap can be prevented from being removed when not in use, and the cap can be easily removed by a pressing operation when in use. The object is to provide a writing instrument with a cap.

  The technical means for solving the above-described problem is that a deformable portion that can be deformed to the inside of the cap by a pressing operation from the outside is provided on the peripheral wall of the cap, and the shaft tube is pressed by the deformable portion when deformed to the inside of the cap. Then, in the writing instrument with a cap in which the cap is removed from the shaft tube, the outer surface of the deformed portion is substantially flush with the outer surface of the cap peripheral wall or is recessed from the outer surface of the cap peripheral wall. An escape recess is provided on the outer surface adjacent to the deformable portion, the recess being recessed to the inside of the cap from the outer surface of the deformable portion, and the finger for pressing operation is allowed to escape by the escape recess. And

Since the present invention is configured as described above, the following effects can be obtained.
Since the outer surface of the deformed part is substantially flush with the outer surface of the cap peripheral wall or is recessed from the outer surface of the cap peripheral wall, the deformed part hits the inner surface of the packing box due to vibration during transportation. It is possible to prevent the cap from coming off due to contact.
Moreover, when the deforming portion is deformed and the cap is removed, the finger pressing the deforming portion is released into the escape recess and sinks deeply, so that the deformation amount of the deforming portion can be secured relatively large. The operability when the deforming part is pressed can be improved.
Therefore, it is possible to prevent the cap from being removed when not in use, and the cap can be easily removed by a pressing operation during use.

It is sectional drawing which shows an example of the writing instrument with a cap concerning this invention. It is a semi-sectional view which shows the cap main-body part and sealing member in the writing instrument with the cap. (A) is a top view which shows an example of a cap main-body part, (b) is a front view with respect to (a). (A) is a principal part enlarged view which shows the state which attached the cap to the axial cylinder, (b) is a principal part enlarged view which shows the state which applied the pressing force to the deformation | transformation part and removed the cap from the axial cylinder. (A) is a principal part enlarged view which shows the state which bent the cap like a bow, (b) is a principal part enlarged view which shows the state which flipped the axial cylinder with the restoring force of the deformation | transformation part, and removed the cap. FIG. 5 is an end view taken along line (IV)-(IV) in FIG. 4, where (a) shows a state where no pressing force is applied to the deformed portion, and (b) shows a state where a pressing force is applied to the deformed portion.

  In one embodiment for carrying out the present invention, a deformable portion that can be deformed to the inside of the cap by a pressing operation from the outside is provided on the peripheral wall of the cap, and the shaft tube is pressed by the deformable portion when deformed to the inside of the cap. In the writing instrument with a cap in which the cap is removed from the shaft tube, the outer surface of the deformed portion is substantially flush with the outer surface of the cap peripheral wall or recessed from the outer surface of the cap peripheral wall. Provided on the outer surface adjacent to the deformable portion is an escape recess recessed inward of the cap from the outer surface of the deformable portion, so that the finger for the pressing operation is released by the escape recess.

  Further, as a preferred specific form of the deforming portion, a substantially concave cutout portion penetrating the peripheral wall in the radial direction of the cap is provided on the peripheral wall of the cap, and the inner portion of the cutout portion is arranged on the free end side on the cap inner side. The deformable portion is capable of bending to the right.

  Further, in order to effectively deform the deforming portion by the sinking of the finger to be operated, the relief recess is provided on the outer surface of the cap peripheral wall so as to be adjacent to the free end of the deforming portion.

  Further, even when a finger to be operated is placed on the side opposite to the free end side, in order to effectively submerge the deforming portion by deeply sinking the finger, the escape recess is not deformed. It is provided in the outer surface of a cap surrounding wall so that it may adjoin from the both sides with respect to the both ends of a part.

In addition, in order to allow the cap to be easily removed by the elastic force when the deformed deformed portion is restored, the deformed portion is formed in a vertical cross-sectional concave shape that can be elastically deformed like a bow, and to the inside of the cap. When deformed, the shaft is pressed by the free end portion.
In addition, even if this form is independent invention which does not comprise the said escape recessed part, there exists an effect, such as making it easy to remove the cap mentioned above.
That is, this independent invention is provided with a deformable portion that can be deformed to the inside of the cap by a pressing operation from the outside on the peripheral wall of the cap, and the shaft tube is pressed by the deformable portion when deformed to the inside of the cap, In the writing instrument with a cap in which the cap is removed from the shaft tube, the deforming portion is formed in a concave shape that can be elastically deformed like a bow, and when deformed to the inside of the cap, the deforming portion is formed by a portion on the free end side. The shaft cylinder is pressed.
The independent invention also includes an aspect in which the deformable portion protrudes from the outer surface of the cap peripheral wall.

  Furthermore, as a form for effectively obtaining the resilience when the deforming portion is restored, the deforming portion is formed such that the central side of the concave section in the longitudinal section is thinner than the other portions.

  Further, in order to stabilize the contact state when the shaft tube is pressed by the deforming portion and to easily remove the cap, a tapered inclined surface is formed on the front end side of the shaft tube, A plurality of convex portions that are in sliding contact with the inclined surface are provided on the free end side of the deformable portion.

In addition, as a preferable form from the viewpoint of preventing slippage when pressing the deformed portion and preventing foreign matter from entering from the notched portion, an elastic covering portion is provided to cover the deformed portion so as to straddle the notched portion.
In addition, even if this form is an independent invention which does not comprise the said escape recessed part etc., there exists an effect, such as an above-mentioned slip prevention and foreign material penetration | invasion prevention.
That is, this independent invention is provided with a deformable portion that can be deformed to the inside of the cap by a pressing operation from the outside on the peripheral wall of the cap, and the shaft tube is pressed by the deformable portion when deformed to the inside of the cap, In the writing instrument with a cap in which the cap is removed from the shaft tube, a substantially concave notch that penetrates the peripheral wall in the radial direction of the cap is provided on the peripheral wall of the cap, and an inner portion of the notch can be freely set. The deformed portion whose end side can be bent toward the inner side of the cap is provided, and an elastic covering portion is provided to cover the deformed portion so as to straddle the cutout portion.

Hereinafter, a particularly preferable specific example of the above embodiment will be described with reference to the drawings.
In the following description, “cap axial direction” means a direction in which the axial center (center) of the cap extends. The “cap radial direction” means a direction substantially orthogonal to the cap axial direction. The “axial cylinder axial direction” means a direction in which the axial center (center) of the axial cylinder extends, and is the same direction as the cap axial direction. The “cap diameter outward direction” means a direction away from the axis in the cap diameter direction.

FIG. 1 shows an example of a writing instrument with a cap according to the present invention.
The writing instrument 1 with a cap includes a long cylindrical shaft cylinder 10 and a cap 20 that is detachably connected to the front end side of the axial cylinder 10, and is pressed on the peripheral wall of the cap 20 from the outside. A deformable portion 21a that can be deformed to the inside of the cap is provided, and the shaft tube 10 is pressed by the deformed portion 21a when deformed to the inside of the cap, so that the cap 20 is removed from the shaft tube 10.
The writing instrument 1 with a cap is configured as a direct liquid writing instrument that guides the ink directly filled in the space in the shaft tube 10 forward and protrudes from the front end of the writing unit 30.

  The shaft cylinder 10 is configured as an integral cylinder formed by connecting the front shaft 11 and the rear shaft 12. In addition, as another example of this axial cylinder 10, it is also possible to set it as the aspect which consists of a single cylindrical member, or the aspect which connects three or more cylinders.

On the front end side of the outer peripheral surface of the front shaft 11, a tapered inclined surface 11a is formed. The inclined surface 11a is a substantially conical surface whose diameter is gradually reduced toward the front (leftward according to FIG. 1).
A portion of the front shaft 11 in front of the inclined surface 11a is formed in a small-diameter cylindrical shape, and an annular groove that fits in an irregular shape with respect to the cap 20 over the entire circumference on the outer peripheral surface of the cylindrical portion to prevent ink leakage. 11b is provided.
A portion of the front shaft 11 on the rear side of the inclined surface 11a is formed in a large-diameter cylindrical shape that fits into the cap 20, and the cap 20 is fitted over the outer peripheral surface of the cylindrical portion so as to get over the cap axis direction. An annular projection 11c is formed.
An annular convex portion 11d that abuts the rear end edge of the cap 20 and receives the rear end edge is provided behind the annular protrusion 11c on the front shaft 11. A portion of the front shaft 11 on the further rear side than the annular convex portion 11d is inserted into and fitted to the front end opening of the rear shaft 12.
Further, an ink storage groove 11e for temporarily storing ink ejected forward from the rear shaft 12 is provided on the front end side of the inner peripheral surface of the front shaft 11. The ink storage groove 11e is a groove that continues in the axial direction of the cylinder, and a plurality of ink storage grooves 11e are provided at intervals in the circumferential direction.

  The rear shaft 12 is formed in a bottomed cylindrical shape with the rear end portion closed, and is fitted and connected to the rear end portion of the front shaft 11.

  As shown in FIG. 2, the cap 20 includes a substantially bottomed cylindrical cap main body 21 and a sealing member 22 that is immovably connected in the cap main body 21.

The cap body 21 is formed in a bottomed cylindrical shape that can be detachably connected to the front portion of the front shaft 11, and the free end 21a1 side is elastically moved into the cap by a pressing operation from the outside on its peripheral wall. A deformable portion 21a that can be bent and deformed is provided.
The outer surface of the deformable portion 21a is provided so as to be substantially flush with the outer surface of the peripheral wall of the cap main body 21 or recessed from the outer surface of the peripheral wall of the cap main body 21. In other words, the deforming part 21a is provided so as not to protrude radially outward from the outer surface of the cap main body part 21 other than the deforming part 21a.

The deformation portion 21a is formed inside the notch portion 21d by providing a notch portion 21d having a substantially concave shape in plan view (see FIG. 3) penetrating the peripheral wall in the cap radial direction on the peripheral wall of the cap body portion 21. It is a cantilever-shaped part, and the free end portion 21a1 on the opposite end side with respect to the base end side is directed rearward of the shaft cylinder (rightward according to FIGS. 1 to 5).
According to the illustrated example, two deformed portions 21a are provided so as to face each other with the axis interposed therebetween.

Each deforming portion 21a is formed in a concave shape that can be elastically deformed like a bow, and presses the inclined surface 11a of the shaft tube 10 by the inner edge on the free end portion 21a1 side when deformed inward of the cap.
The outer surface of the free end 21a1 of the deformed portion 21a is substantially the same as the outer surface of the cap body 21 on the rear end side (the right end side according to FIGS. 2 and 3) (the largest diameter portion other than the protrusion 21h). It is the same.
The deformed portion 21a is formed so that the central side of the concave section in the longitudinal direction of the cap is recessed toward the inner side of the cap so as to be gradually thinner than the portions on both sides thereof. According to this structure, when the center side of the deformation | transformation part 21a is pressed, this deformation | transformation part 21a can be effectively changed into a bow.

The concave surface of the deformable portion 21a is provided with a plurality of concave and convex strips 21a2 so as to prevent the finger f from slipping and promote deformation of the deformable portion 21a.
The ridges 21a2 are formed by alternately arranging ridges and grooves in a direction orthogonal to the cap axis direction.

In addition, a plurality of convex portions 21e that can slide on the inclined surface 11a of the shaft tube 10 are provided on the inner edge of the deformable portion 21a on the free end portion 21a1 side. According to the illustrated example, these convex portions 21e are a plurality of protrusions formed by forming the inner edge of the deformable portion 21a on the free end 21a1 side in a substantially stepped cross section.
According to this configuration, when the deforming portion 21a bends inward of the cap, the contact force between the inner edge of the deforming portion 21a on the free end 21a1 side and the inclined surface 11a of the shaft tube 10 has a plurality of convexities. Since the portions 21e are substantially evenly distributed, the deformable portion 21a and the inclined surface 11a can be brought into a stable contact state.

  And in the part adjacent to the deformation | transformation part 21a in the outer surface of the cap main-body part 21, in order to miss the finger f for press operation (refer FIG. 4), it was dented inside the cap rather than the outer surface of the deformation | transformation part 21a. First and second relief recesses 21b and 21c are provided.

  The first escape recess 21b is adjacent to the free end 21a1 of the deformable portion 21a with the notch 21d therebetween and from the rear side (right side according to FIGS. 1 to 5), The cap body 21 is provided on the outer surface of the peripheral wall. And according to the example of illustration, this 1st escape recessed part 21b is formed in the inclined surface shape which inclines inside a cap toward the front (refer FIG. 2 and 3).

The second relief recess 21c is provided on the outer surface of the peripheral wall of the cap body 21 so as to be adjacent to both ends of the deformable portion 21a with the notch 21d interposed therebetween (see FIG. 3 ( b)). In other words, two second escape recesses 21c are arranged so as to sandwich the deformed portion 21a and the cutout portion 21d from both sides in the cap circumferential direction.
If it demonstrates in detail about the example of illustration, each 2nd escape recessed part 21c will be formed in the substantially circular arc shape dented inside a cap (refer Fig.3 (a)). The length of the second relief recess 21c in the cap axis direction is set to a length including all the concave portions on the surface of the deformation portion 21a.

Further, the cap main body portion 21 is provided with an elastic covering portion 23 that covers the deformed portion 21a so as to straddle the notch portion 21d as necessary.
The elastic covering portion 23 is a coating made of a synthetic resin material having elasticity such as an elastomer resin, and is simultaneously formed (two-color forming) when the cap main body portion 21 is formed.

In the illustrated example, the elastic covering portion 23 is partially provided in the circumferential direction and the axial direction of the cap main body portion 21 so as to cover the deformation portion 21a and the notch portion 21d. It is also possible to adopt an aspect formed in a cylindrical shape covering 21a and the notch 21d, an aspect covering the entire outer surface of the cap main body 21, or the like.
Further, as another example of the elastic covering portion 23, a member molded separately from the cap body portion 21 may be attached to the cap body portion 21.

In addition, a vent 21f that communicates the space inside the cap body 21 to the outside on the front side of the cap is provided at the bottom of the cap body 21 (the left end according to FIGS. 1 and 2). A plurality of the vent holes 21f are provided at intervals in the cap circumferential direction.
The vent 21f communicates with the opening in the rear end (right end in FIG. 2) of the cap main body 21 through the space in the cap main body 21, and the cap 20 is accidentally swallowed and clogged in the throat. In case, ensure a ventilation passage for breathing.

In addition, a connection projection 21g is provided on the bottom of the cap body 21 so as to protrude rearward within the cap. On the projecting end side of the connection projection 21g, a locking portion 21g1 projecting outward in the cap diameter direction (upward according to FIG. 2) is provided.
When the connection protrusion 21g is press-fitted into a connection hole 22b of the sealing member 22 to be described later, the engagement portion 21g1 is caused to bite into the inner wall of the connection hole 22b.

  Further, when the cap 20 is fitted to the shaft tube 10 on the opening end side (the right end side according to FIG. 2) of the inner peripheral surface of the cap main body portion 21, the cap member 10 may get over the annular protrusion 11 c of the shaft tube 10 in the axial direction. In addition, a ride-over protrusion 21i is provided. The protrusions 21i are protrusions having a mountain-like cross section having a gently inclined surface, and a plurality (four in the illustrated example) are provided at intervals in the cap circumferential direction.

  A plurality of vertical ribs 21j extending in the cap axial direction are provided on the inner peripheral surface of the cap main body 21 at substantially equal intervals in the circumferential direction. The plurality of vertical ribs 21j stabilize the cap 20 inner peripheral surface and the shaft tube 10 outer peripheral surface by distributing the contact force between the cap 20 inner peripheral surface and the shaft tube 10 outer peripheral surface substantially evenly in the circumferential direction. Hold in contact.

  In addition, a plurality of substantially hemispherical protrusions 21h are provided on the outer peripheral surface of the cap body portion 21 at intervals in the cap axis direction (see FIG. 3). These projections 21h act as rolling prevention when the cap main body 21 and the writing instrument 1 with a cap are placed on a flat surface.

The sealing member 22 is a substantially bottomed cylindrical member connected to the bottom side in the cap main body portion 21, and is arranged on the inner peripheral surface of the opening end side (right end side in FIG. 2) on the front end side of the front shaft 11. An annular protrusion 22a that fits in an airtight manner to the annular groove 11b is provided.
Further, a connection hole 22 b for fitting the connection protrusion 21 g of the cap body 21 is provided at the bottom of the sealing member 22. This connected hole 22b is formed so as to gradually narrow in the depth direction.
In addition, a plurality of concave portions 22c continuous in the cap axis direction are provided on the outer peripheral portion of the sealing member 22 at intervals in the circumferential direction. These recesses 22 c communicate with the vent 21 f at the bottom of the cap body 21 in a state where the sealing member 22 is connected in the cap body 21, and secure an air passage inside and outside the cap.

The sealing member 22 having the above configuration accommodates the writing unit 30 in a sealed space in a state where the cap 20 is fitted to the shaft tube 10, and prevents ink from volatilizing from the writing unit 30, As a result, the ink around the writing unit 30 is prevented from flowing out of the cap 20.
As another example of the cap 20, the cap main body 21 and the sealing member 22 may be configured as an integral member.

  In FIG. 1, reference numeral 30 is a writing part that guides ink ejected from the rear shaft 12 to the front by capillary force, and reference numeral 40 is connected to the rear end of the writing part 30 and can be moved forward and backward. The provided valve body, reference numeral 50 is a valve seat member that is opened and closed by the valve body 40, reference numeral 60 is a coil spring that urges the valve body 40 in the valve closing direction, and reference numeral 70 is the rear end of the coil spring 70. Reference numeral 80, a receiving member that is fixed so as to be received and supports and supports the rear portion of the valve body 40 so as to be able to advance and retreat, is an agitator that is provided in the rear shaft 12 so as to be able to advance and retreat, and stirs ink.

Next, the characteristic effect of the writing instrument 1 with a cap having the above configuration will be described in detail.
As shown in FIG. 4A, in the state in which the cap 20 is attached to the shaft tube 10, the maximum diameter portion of the outer surface of the deformable portion 21a (the outer edge portion of the free end portion 21a1) is outside the peripheral wall of the cap main body portion 21. Since it is substantially flush with the surface, for example, even if the writing instrument 1 with a cap abuts against a packing box or the like during conveyance, the deformable portion 21a is not pushed and the cap 20 is not removed.

Further, when removing the cap 20 from the shaft tube 10, for example, as shown in FIG. 4B, the range from the deformed portion 21a to the first relief recess 21b is picked and pressed by the fingers f and f. Then, the tip side of the finger f sinks into the first escape recess 21b, the belly portion of the finger f sinks into the second escape recess 21c, and the deformable portion 21a bends inside the cap.
Therefore, it is possible to ensure a large amount of bending of the deforming portion 21a as compared with the case where there are no relief recesses 21b and 21c.

The deformed deformation portion 21a pushes the shaft tube 10 rearward by bringing the plurality of convex portions 21e on the inner edge side of the free end portion 21a1 into sliding contact with the inclined surface 11a of the shaft tube 10. Therefore, the over-fitting state between the over-projection protrusion 21i (see FIG. 2) on the inner peripheral surface of the cap 20 and the annular protrusion 11c on the outer peripheral surface of the shaft cylinder 10 is released, and the cap 20 is detached from the shaft cylinder 10 (FIG. 4B). )reference).
At this time, the deformed portion 21a and the inclined surface 11a are in a stable slidable contact state by the plurality of convex portions 21e, and the inner peripheral surface of the cap 20 and the outer peripheral surface of the shaft tube 10 are a plurality of vertical portions of the inner peripheral surface of the cap 20. Since the rib 21j (see FIG. 2) is in a stable sliding contact state, as a synergistic effect thereof, the force for pressing and deforming the deforming portion 21a is unlikely to vary, and when the deforming portion 21a is pressed with the finger f A feeling of operation becomes good.

Further, as shown in FIG. 5, for example, when a pressing force is mainly applied to the concave portion of the deforming portion 21a, the deforming portion 21a is deformed into a bow (see FIG. 5A). Then, due to the elastic force generated when the deformed portion 21a deformed in a bow shape is elastically restored, the climbing protrusion 21i (see FIG. 2) on the inner peripheral surface of the cap 20 and the annular protrusion 11c on the outer peripheral surface of the shaft cylinder 10 are overcome. While the fitting state is released, the shaft tube 10 is flipped rearward and the cap 20 is pulled forward (see FIG. 5B).
Therefore, the cap 20 can be removed by a relatively light picking operation.

  Therefore, according to the writing instrument 1 with a cap of the present embodiment, it is possible to prevent the cap 20 from being removed when not in use, and at the time of use, by a pressing operation of grasping both deformed portions 21a and 21a of the cap 20 from both sides. The cap 20 can be easily removed, and a position where the pressing operation can be satisfactorily performed can be ensured in a relatively wide range in the cap axial direction.

  In the above description (see FIGS. 4 to 6), the operational effect is described in a state where the elastic covering portion 23 is omitted. However, when the elastic covering portion 23 is provided, in addition to having the same operational effect as described above. Thus, there are further operational effects such as preventing the finger f pressing the deforming portion 21a from slipping and preventing foreign matter from entering from the notch 21d (see FIG. 3).

  In addition, according to the said embodiment, although the deformation | transformation part 21a was formed in the cantilever shape, as another example, the deformation | transformation part (not shown) which consists of a material which has a part or all of the cap main-body part 21 elastically. It is also possible that the deformed portion is deformed inside the cap and presses the shaft tube 10.

  Further, according to the above embodiment, the escape recesses 21b and 21c are arranged on the outer surface of the peripheral wall of the cap body 21. As another example, the free end 21a1 of the deformable portion 21a is the open end of the cap body 21. A relief recess (not shown) may be provided on the outer surface of the peripheral wall of the shaft tube 10 so as to be substantially coincident with the portion and adjacent to the free end portion 21a1 from the rear side.

  Further, in the illustrated example, a so-called direct liquid type writing instrument is configured, but as another example, a batting type writing instrument that guides the ink soaked into the batting in the shaft tube 10 forward and ejects it from the writing unit, It is also possible to configure a ballpoint pen, a correction pen, or the like that protrudes from the tip of the chip.

1: Writing instrument with cap 10: Shaft cylinder 11a: Inclined surface 20: Cap 21a: Deformation part 21a1: Free end part 21b: First relief recess 21c: Second relief recess 21d: Notch 23: Elastic covering part f: finger

Claims (8)

A deformable portion that can be deformed to the inside of the cap by a pressing operation from the outside is provided on the peripheral wall of the cap, the shaft tube is pressed by the deformed portion when deformed to the inside of the cap, and the cap is removed from the shaft tube. In a writing instrument with a cap,
The outer surface of the deformed portion is provided substantially flush with the outer surface of the cap peripheral wall or recessed from the outer surface of the cap peripheral wall,
A cap provided on the outer surface adjacent to the deformable portion is provided with an escape recess recessed toward the inside of the cap from the outer surface of the deformable portion, and a finger for the pressing operation is escaped by the escape recess. Writing instrument with.   A substantially concave notch that penetrates the peripheral wall in the radial direction of the cap is provided on the peripheral wall of the cap, and the inner part of the notch is the deformed part whose free end can be bent toward the inside of the cap. The writing instrument with a cap according to claim 1.   The writing instrument with a cap according to claim 2, wherein the relief recess is provided on an outer surface of the peripheral wall of the cap so as to be adjacent to a free end of the deformable portion.   The writing instrument with a cap according to claim 2 or 3, wherein the relief recess is provided on an outer surface of the cap peripheral wall so as to be adjacent to both side ends of the deformable portion from both sides.   The deformed portion is formed in a concave shape with a vertical cross section that can be elastically deformed like a bow, and when deformed inward of the cap, the shaft tube is pressed by a portion on the free end side thereof. A writing instrument with a cap according to claim 1.   6. The writing instrument with a cap according to claim 5, wherein the deforming portion is formed such that a center side of the concave section in the longitudinal section is thinner than other portions.   3. A tapered inclined surface is formed on the front end side of the shaft tube, and a plurality of convex portions that are in sliding contact with the inclined surface are provided on the free end side of the deformable portion. The writing instrument with a cap of any one of thru | or 6.   The writing instrument with a cap according to any one of claims 2 to 7, further comprising an elastic covering portion that covers the deformation portion so as to straddle the notch portion.

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