JP2017154369A - Retractable writing instrument - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a retractable writing instrument of not becoming heavy in an operation load for retracting a pen point while being formable in a thin body.SOLUTION: A guide passage is provided with a first inclined wall for shifting-guiding a projection part of a ring in the circumferential direction of a writing instrument body and a second inclined wall for shifting-guiding in the circumferential direction opposite to the first inclined wall, to be thereby guidable to an engaging part of a pen point projection state or an engaging part of a pen point immersion state, and a third inclined wall for shifting-guiding the projection part of the ring in the radial direction of the writing instrument body for getting over the first inclined wall or the second inclined wall, is provided in the guide passage between the first inclined wall and the second inclined wall, and the first inclined wall and the second inclined wall are arranged in the same axial directional position of the writing instrument body.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a retractable writing instrument in which a writing instrument body having a pen tip at a tip is housed in an exterior body so as to be movable back and forth, and the writing instrument body is operated to cause the pen tip to appear and disappear from the tip of the exterior body.

  Conventionally, a writing instrument body having a pen tip at the tip is housed in the exterior body so as to be movable back and forth, and the writing mechanism body is used as a retractable writing instrument in which the pen tip is projected and retracted from the tip of the exterior body by an operation. What is known is that the engaging part such as a protrusion formed on the writing instrument body urged rearward by a resilient member such as a coil spring resists the resilient force of the resilient member by a knocking operation or the like. Using a feeding mechanism called a so-called heart cam mechanism, which is operated and guided to a guide path such as a groove formed on the exterior body so that it can be locked in both the protruding state and the immersed state of the pen tip. Things are known.

  For example, Japanese Patent Laid-Open No. 11-321182 discloses a retractable writing instrument that engages and disengages the pen tip by guiding an engaging body that moves together with the writing medium to a guide hole formed in the outer cylinder. .

Japanese Patent Laid-Open No. 11-32182

  However, in the retractable writing instrument described in Patent Document 1, the engaging body moves to the peripheral surface of the exterior body along the guide hole formed in the shaft, and is guided to the engaging position. For this reason, the width of the writing instrument main body must be secured, and if the exterior body becomes thicker or a slim exterior body, a large rotation is required to engage the engaging portion with the guide hole. As a result, the resistance to the knocking operation, which is an operation in the longitudinal direction, is increased.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a retractable writing instrument that can be made slender but does not increase the operating load for retracting the pen tip.

  According to the present invention, a ring having a convex portion is arranged on a writing instrument body that is urged rearward by an elastic body and arranged to be movable back and forth in the exterior body so as to be rotatable on the circumference of the writing instrument body. Or the engaging part which the convex part of the ring moves to the member attached to the exterior body by the back-and-forth movement of the writing instrument body, and forms the protruding state from the exterior body front end opening of the pen tip at the distal end of the writing instrument body In the retractable writing instrument having a guide path having an engaging portion that forms an immersive state, a first inclined wall that shifts and guides the convex part of the ring in the circumferential direction of the writing instrument body is provided in the guide path, and the first By providing a second inclined wall that is displaced and guided in a circumferential direction opposite to the inclined wall of 1, it is possible to guide to the engaging portion in the pen tip protruding state or the engaging portion in the pen tip immersed state, and The convex part of the ring is connected to the first inclined wall or the second A third inclined wall is provided in the guide path between the first inclined wall and the second inclined wall to guide the displacement in the radial direction of the writing instrument body in order to get over the inclined wall, and the first inclined wall And a second inclined wall arranged at the same axial position of the writing instrument body.

  The retractable writing instrument according to the present invention includes a first inclined wall that shifts and guides a convex portion of a ring guided by an engaging portion for locking and retracting in the circumferential direction of the writing tool body, and the first inclined wall. By providing a third inclined wall that shifts and guides in the radial direction of the writing instrument main body in order to get over the first inclined wall or the second inclined wall with the second inclined wall that guides the movement in the opposite circumferential direction. The writing tool main body can be arranged at the same axial direction position, the guide path is small in the amount of expansion in the circumferential direction of the exterior body, and the retractable writing instrument can be made slender and the pen tip can be easily operated.

Longitudinal sectional view showing Example 1 Perspective view showing parts of lid Cross-sectional perspective view showing parts of exterior body Perspective view showing parts of annular member Perspective view showing parts of the writing instrument body Perspective view showing parts of annular elastic body Perspective view showing parts of exterior body Perspective view showing parts of rotor Top view showing rotor components Perspective view showing clip parts Bottom view showing clip components The perspective view which shows the state which assembled the writing instrument main body, the tail plug, and the rotor Top view excluding the non-proximal end of the clip of Example 1 Enlarged view of broken line portion of FIG. 13 showing stage 1 illustrating the operation of the rotor Enlarged view of broken line portion of FIG. 13 showing stage 2 illustrating the operation of the rotor Enlarged view of broken line portion of FIG. 13 showing stage 3 illustrating the operation of the rotor Enlarged view of broken line portion of FIG. 13 showing stage 4 illustrating the operation of the rotor Enlarged view of broken line portion of FIG. 13 showing stage 5 illustrating the operation of the rotor Enlarged view of broken line portion of FIG. 13 showing stage 6 illustrating the operation of the rotor

The retractable writing instrument mainly comprises an exterior body, a writing instrument body having a pen tip at the tip, an elastic body for always biasing the writing instrument body backward in the exterior body, and an operation member for operating the writing instrument body Has been.
The exterior body is composed of one part or an assembly of two or more parts such as a front shaft and a rear shaft, and an opening is provided at the front end so that the pen tip provided on the front end of the writing instrument body protrudes from the exterior body. Is formed.
The pen tip provided at the tip of the writing instrument body can be used as appropriate, such as a ballpoint pen tip, a fiber converging body, a porous material such as urethane, and a synthetic resin having a communication hole.
The writing instrument main body contains the coating liquid inside, and this coating liquid is stored in a free state directly in the coating body without impregnating or using an occlusion body such as a fiber converging body. May be. The coating liquid to be used can also be suitably used, such as a cosmetic coating liquid and ink for writing instruments. In the case of ink for writing instruments, dyes and / or pigments can be used as colorants, and water and organic solvents can be used as appropriate for the medium.

  The operation of advancing the writing instrument body and causing the pen tip to protrude from the tip of the exterior body is done by placing a knocking member disposed at the rear end of the writing instrument body or an operating member such as providing a slide mechanism on the side, Can be appropriately adopted.

In a state where the writing instrument body is not in use, it is stored for a long time by providing a sealing part to block the pen tip from the outside air in the exterior body in order to suppress evaporation of the coating liquid etc. Can be used even if there is. In this case, by configuring the mechanism for closing and opening the passage through which the pen tip passes in accordance with the longitudinal movement of the writing instrument body, it is possible to make it in a non-use state and a use state by one operation. It can be set as an applicator.
As a mechanism for blocking the application part from the outside air, a lid opening / closing method for opening and closing the lid by an operation as disclosed in JP-A-2005-335082 and JP-A-2011-173407, and JP-A-2004-314513 are disclosed. In the state where the slit is formed in the elastic body arranged in the opening of the exterior body as disclosed, and the pen nib is stored in the cylindrical body, the slit is tightened from the outside, and the pen nib or the other by the advancement of the application body The slit valve system etc. which open the slit of a cylindrical body by the means of these are mentioned, It can select suitably.
In addition, if the tip of the pen itself, such as a ballpoint pen, has a valve function that closes the inside, or if there is minimal concern about inability to write due to drying, such as a mechanical pencil, pencil, or crayon, a sealed structure is always provided. There is no need.

An embodiment of the present invention will be described with reference to FIGS.
In the present embodiment, the pen tip direction of the writing instrument is described as the front, the opposite is the rear, the direction away from the axis of the writing instrument body in the radial direction is the upper, the direction toward the opposite axis is the lower, This also applies to the following embodiments.
FIG. 1 is an overall longitudinal sectional view of an example of a retractable writing instrument according to the present invention, in which a low-viscosity ink using a fiber converging body as a nib and water and / or an organic solvent as a medium is a fiber converging body. It is assumed to be used by impregnating the occlusion body.
A writing instrument main body 3 having a pen tip 2 at the tip is housed in an exterior body 1 which is a member for holding the writing instrument by hand so as to be movable back and forth. The exterior body 1 is a cylindrical body provided with through holes having openings at the front and rear ends, the front end opening 1a is a pen tip protrusion, and the rear end opening 1b is a protrusion of an operation member. . An annular elastic body 5 that is in sliding contact with a lid body 4 to be described later is fitted and fixed to the front end opening 1a. When the lid body 4 is closed, the lid body 4 and the annular elastic body 5 are fixed. Circumferential contact is made to block ventilation in the portion.

The writing instrument main body 3 includes a shaft cylinder 3a using polypropylene having good moldability and a bottomed cylindrical tail plug 7 with little gas permeation. The outer shape of the shaft tube 3a is mainly formed from a narrow diameter portion 3b, a large diameter portion 3c, and a shoulder portion 3d therebetween. The small diameter portion 3b mainly accommodates the pen tip 2 protruding from the tip, and is thick. The diameter portion 3c mainly accommodates the ink storage body 6. The nib 2 is caulked and held by a metal nib holder 2b, and the nib holder 2b is fixed by being press-fitted into the inner hole of the tip of the small diameter portion 3b. The end is connected to the tip of the ink occlusion body 6 in an embedded manner so that the ink communicates. A coil spring 8 is disposed between the shoulder 3d and the exterior body 1 of the small diameter portion 3b of the shaft tube 3a, and urges the shaft tube 3a backward. An annular elastic body 10 is fitted in the small diameter portion 3b, and the annular elastic body 10 is in airtight contact with the inner wall of the exterior body 1 so that the space behind the pen tip 2 exists. A sealed state is formed, and the space where the pen tip 2 is present can be shut off from the outside air by closing the front end opening 1a of the exterior body 1 of the lid 4.
The tail plug 7 is screwed into the liquid nest while being inserted inward of the shaft cylinder 3 a, and the ink occlusion body 6 is interposed in the internal space of the tail plug 7. A plurality of ribs 7 a are formed on the bottom and inner walls of the inner wall of the tail plug 7, and in particular, the ribs 7 a on the inner wall extend in the longitudinal direction. In addition, an air passage that communicates with the internal space of the shaft cylinder 3a is formed, and the ink storage body 6 is sandwiched between the ribs 7a. When the tail plug 7 is removed from the shaft cylinder 3a, the ink storage is performed. The body 6 is removed with the tail plug 7. By doing so, when the ink impregnated in the ink occluding body 6 is consumed or the ink occupies little or no ink is used, the ink occluding body 6 is taken out together with the tail plug 7 and impregnated with the ink again. The occlusion body 6 can be replaced. The ink occlusion body 6 has a side wall covered with a synthetic resin film such as polyethylene so that the hand is not soiled even when touched during replacement.

FIG. 2 is an external perspective view of the lid body 4, and FIG. 3 is an enlarged view of the main part of the front end portion of the exterior body. The lid body 4 has a lid portion 4 a and a side wall portion 4 b that can close the front end opening 1 a of the exterior body 1, and two bearing portions formed on the side wall portion 4 b so as to face the inner wall of the exterior body 1. A cylindrical rotating shaft 4c that comes into contact with 1c is provided in a convex state on the outside. The front end surface of the rotating shaft 4c is formed as an inclined curved surface so that the lid body 4 does not interfere with the exterior body 1 when driven inside the exterior body 1.
A portion between the side wall portions 4b of the lid body 4 is a space portion. When the lid body 4 rotates and moves to release the front end opening 1a of the exterior body 1, a path through which the pen tip 2 can pass is provided. To form.
Further, an inner cam portion 4 d is formed as an inward projection on the inner wall portion of the side wall portion 4 b of the lid 4. The inner cam portion 4d is a portion that abuts against the writing instrument main body 3 as the writing instrument main body 3 moves forward. By the impingement, the writing instrument main body 3 pushes the lid body 4 to forcibly rotate the lid body 4 and the exterior body 1 The front end opening portion 1a and the space portion of the lid 4 are exposed, and the pen tip 2 protrudes.
The rotating shaft 4c of the lid body 4 is provided with a rotating cam portion 4f, and an uneven cam portion 1v corresponding to the rotating cam portion 4f is formed on the bearing portion 1d of the exterior body 1. The rotating cam portion 4f is rotated by an uneven cam portion 1v formed on the bearing portion 1d, whereby the rotating shaft 4c rotates and moves up and down (moves upward and downward).
In addition, the wall provided above and below the front wall (receiving surface 1d) needs a distance for the rotary shaft 4c to move up and down. Therefore, the bearing portion 1d has a concave shape that is long upward.

An annular member 9 is disposed at the rear of the lid body 4 so as to push the lid body 4 forward. The annular member 9 is in contact with the annular elastic body 10 and is in contact with the lid body 4 at the side wall portion 9b. As shown in FIG. 4, which is an enlarged perspective view of a part, a contact surface 9 c is provided at the front end of the side wall portion 9 b, and the contact surface 9 c is formed on the inclined surface 9 d and the outside of the lid body 4 when the lid body 4 is opened. The cam portion 4e has a locking groove 9e for dropping and locking, and a projection 9f. The side wall portion 9b transmits the elastic force of the rear coil spring 8 to the outer cam portion 4e of the lid body 4 through the contact surface 9c, and in the direction of closing the front end opening 1a of the exterior body 1 to the lid body 4. Giving rotational force. In addition, the inner shape of the connecting portion 9a is formed with an inner hole portion 9g through which the small diameter portion 3b of the writing instrument main body 3 can pass. However, it is possible to make point contact with the small diameter portion 3b of the writing instrument main body 3 having a circular cross section. Furthermore, the corner portion of the quadrangle is a curved surface.
Since the annular member 9 is a member that is in sliding contact with the lid body 4 and rotates and moves the lid body 4 up and down, polyacetal having self-lubricating properties and excellent frictional wear properties is used.

  As shown in FIG. 5, which is an enlarged perspective view of parts, the elastic body 10 includes an outer sealing rib 10 a that is in airtight contact with the inner surface of the exterior body 1 and an annular elastic body 10 that slides within the exterior body. It has the outside inclination prevention rib 10b which prevented that it inclined too much, and has the inner side sealing rib 10c which carries out airtight sliding contact with the writing instrument main body 3 inside. The inner sealing rib 10c is a double rib. By retaining the hardly volatile liquid material between the ribs 10c, the inner sealing rib 10c is reliably sealed with the writing instrument body 3, and the sliding resistance is kept low. In addition, the inner sealing rib 10a and the inner sealing rib 10c are displaced in the axial direction back and forth so that the outer sealing rib 10a is bent inward by contact with the exterior body 1 and the writing tool main body 3 is in contact with the inner side. Since the outward bending of the sealing rib 10c does not collide in the radial direction, the sliding resistance when the writing instrument body 3 is moved and when the annular elastic body 10 is moved backward is reduced. A receiving groove portion 10 d connected to the coil spring 8 is formed in an annular shape at the rear end portion of the annular elastic body 10.

  A window hole 1e is formed in the rear outer peripheral surface of the exterior body 1, and the window hole 1e is an outer peripheral side surface of a rotor 11 described later when the writing instrument body 3 is inserted from the rear end opening 1b of the exterior body. It is formed from the rear end opening 1b of the exterior body 1 so that the convex portion 11a formed on the outer wall 1 can easily enter.

As shown in FIG. 7, which is a rear enlarged perspective view of the outer package 1, the window hole 1 e of the outer package 1 has a narrow portion 1 f that is slightly wider at the rear than the convex portion 11 a of the rotor 11, and the front is one side in the circumferential direction. The wide part 1g is very wide. In the window hole 1e, a guide path having an engaging portion 1u that forms a protruding state of the pen tip 2 from the front end opening 1a of the exterior body 1 and an engaging portion 1t that forms an immersion state is formed. . A step portion 1h is provided on one front side of the narrow portion 1f of the window hole 1e, and an engagement portion 1u that forms a protruding state of the pen nib 2 from the exterior body front end opening 1a is provided on the step portion 1h. Is formed. The engaging portion 1u that forms a protruding state is formed by connecting the surface of the step portion 1h and the side edge portion 1j of the wide portion 1g of the window hole 1e, and the surface of the step portion 1h increases in width toward the rear. It faces the part 1g and is an inclined surface that guides the convex part 11a of the rotor 11 to the engaging part 1u that forms a protruding state.
The front edge part 1k of the wide part is inclined so as to go to the side edge part 1m opposite to the side on which the engaging part 1u forming the protruding state is present as it goes forward from the side edge part 1j of the wide part 1g. ing. The front edge portion 1k serves as a second inclined wall 1n that shifts and guides the convex portion 11a of the rotor 11 in the circumferential direction of the writing instrument body 3. Further, a clip mounting portion 1o for mounting the clip 12 is formed on the rear outer peripheral surface of the window hole 1e of the exterior body 1. A protrusion 1p having a further reduced width of the narrow portion 1f in front of the clip mounting portion 1o is formed to face each other. The protrusion 1p has an inclined surface 1q in which the width of the window hole is narrowed as the rear side faces forward, and the protrusion 11a of the rotor 11 inserted from the exterior body rear end opening 1b It is easy to pass, and further serves to suppress the backward bias of the writing instrument body 3 biased backward by the coil spring 8. Further, the protrusion 1p is a temporary restraint when assembling the clip 12. When the writing instrument is used, even if the protrusion 1p is damaged, the protrusion 12b provided on the base end 12a of the clip 12 described later is immediately behind. Since it is inserted, the urging | biasing to the back of a writing instrument main body can be suppressed.

The clip mounting portion 1o is formed so as to bridge both edge portions of the outer peripheral surface having a substantially C-shaped cross section by the window hole 1e. By forming in this way, deformation behind the exterior body 1 having a substantially C-shaped cross section can be suppressed by the window hole 1e formed from the rear end opening 1b of the exterior body 1.
Further, the clip mounting portion 1o has two engagement holes (front engagement hole 1r, rear engagement hole 1s) on the both sides of the bridging portion around the window hole 1e of the exterior body 1 at the front and rear. ing.

The clip 12 shown in FIGS. 10 and 11 is disposed so that the base end portion 12 a of the clip 12 is fitted into the clip mounting portion 1 o of the exterior body 1 and covers the window hole 1 e of the exterior body 1.
The rear surface of the base end portion 12a of the clip 12 has two front and rear engagement projections (a front engagement projection 12c and a rear engagement) so as to engage with the front engagement hole 1r and the rear engagement hole 1s of the clip mounting portion 1o. A protrusion 12d) is formed. The rear two engaging projections 12d are formed with claw portions facing in the circumferential direction. The front two engaging protrusions 12c are formed with claw portions toward the front so as to be hooked on the inner diameter side end surface of the front engaging hole 1r. By forming in this way, it is more difficult to come off when the front of the clip is lifted upward.

In the center front of the clip base end portion 12a, a projecting portion 12b projecting downward so as to enter the narrow portion 1f of the window hole 1e of the exterior body 1 is formed, and the width of the window hole 1e of the exterior body 1 is formed. It serves as an engaging portion 1t that forms an immersive state so as to surround both side edges of the narrow portion 1f.
As shown in FIG. 11, a first inclined wall 12 f that shifts and guides the convex portion 11 a of the rotor 11 in the circumferential direction of the writing instrument body 3 is formed on the back surface of the opposite base end portion 12 e of the clip 12. It protrudes and is located on the same axis as the second inclined wall 1n. The first inclined wall 12f is inclined forward from the side edge portion 1m opposite to the side where the engaging portion 1u forming the protruding state is present toward the wide side edge portion 1j. As shown in FIG. 13, the first inclined wall 12 f and the second inclined wall 1 n can guide the convex portions 11 a of the rotor 11 to the opposite sides in the circumferential direction, and the development in the circumferential direction is small. A cam structure can be used.

  A third inclined wall 12g for getting over the first inclined wall 12f is formed in the foremost portion of the first inclined wall 12f, and a side surface 12h extending rearward is formed on the third inclined wall 12g. It is connected continuously. The third inclined wall 12g is an inclined surface 12i that is positioned in front of the engaging portion 1u that forms a protruding state, and that gradually decreases in height toward the rear. Since the third inclined wall 12g is formed in the forefront portion of the first inclined wall 12f, the convex portion 11a extends from the first inclined wall 12f to the second inclined wall that is on the same axis as the first inclined wall. It becomes possible to guide to the wall 1n, and the guide path to the circumferential direction of the convex part 11a can be made small.

  A protrusion 3e is formed on the outer peripheral surface of the large-diameter portion 3c of the writing instrument main body 3, and protrudes out of the exterior body 1 through a window hole 1e provided in a side portion of the exterior body 1. The protrusion 3e is engaged with an engaging portion 1t that forms the immersion state in order for the writing instrument body 3 biased rearward to maintain the pen tip 2 immersion state.

On the outer peripheral surface of the large-diameter portion 3c of the writing instrument body 3, a concave portion 3f for rotatably disposing the rotor 11 having a C-shaped cross section is formed in front of the protrusion 3e. The recess 3f has a C-shaped cross section that matches the cross section of the rotor 11, and does not interfere with the rotation of the rotor.
Further, the concave portion has a C-shaped portion 3g having a short foot in the circumferential direction at the front and a C-shaped portion 3h having a long foot in the circumferential direction at the rear. A protrusion 3j extending rearward is formed along the outer peripheral surface of the large-diameter portion 3c of the writing instrument body 3 on the front edge 3i of the C-shaped portion having a short foot in the circumferential direction of the recess. The protrusion 3j engages with a concave portion 11b of the rotor 11 to be described later, thereby preventing the rotor 11 from moving in the circumferential direction and assisting the movement in the circumferential direction when the rotor 11 moves backward. Have a role to play.

The rotor 11 includes a C-shaped portion 11b as in the cross section of the concave portion 3f of the writing instrument body 3, and an extended portion 11c having a short width is formed from both ends thereof.
This is because when the rotor 11 is assembled in the reverse direction, the extension portion 11c of the rotor 11 interferes with the short C-shaped portion 3g of the foot of the recess 3f of the writing instrument body 3 and the C-shaped portion 3h of the long foot. By doing so, it plays a role in preventing incorrect assembly.
On the outer surface of the rotor 11, a convex portion 11 a that is inserted into the window hole 1 e of the exterior body 1 and guided to each inclined wall is provided through the window hole 1 e provided on the side of the exterior body 1. Protrudes out of.
The rear end surface of the convex portion 11a is a rear inclined surface 11d that is inclined to the side where the engaging portion 1u that forms a protruding state toward the rear is present. With such an inclined surface, the rotor 11 advances backward by the biasing force of the coil spring 8, and the convex portion 11a of the rotor 11 contacts the surface of the stepped portion of the engaging portion 1u forming the protruding state. In this case, the number of surfaces that come into contact with the stepped portion increases as the convex portion 11a moves rearward, so that even if the abutted surface is small, it is guided more reliably to the engaging portion 1u that forms a protruding state. Can.
A front inclined surface 11e whose height gradually decreases toward the front is formed on the front end surface of the convex portion 11a. Moreover, although the cross section of the convex part 11a is the rectangle extended in the front-back direction, the taper surface of 45 degrees is provided in the front corner part, it is not restricted to this shape, It is not necessary to provide. As long as it can pass through the guide path formed in the window hole 1e of the exterior body 1 and is further locked to the engaging portion 1u that forms the protruding state and can maintain the pen tip protruding state, it can be applied as appropriate. it can.
Further, at the front end portion of the center portion of the C-shaped cross section of the rotor, there is a restriction recess 11f for restricting the rotation of the rotor 11 in the circumferential direction with respect to the writing instrument body 3 from the front end portion toward the rear. An auxiliary recess 11g that assists rotation in the circumferential direction is formed.

Next, based on FIGS. 12 to 19, the convex portion 11 a of the rotor 11 forms a state in which the pen tip 2 protrudes from the exterior body front end opening 1 a from the immersing position where the pen tip 2 is immersed. An operation of moving a series of guide paths from the protruding position and the state where the pen tip 2 protrudes to the immersive state will be described.
When the tail plug 7 that is connected to the rear end portion of the writing instrument body 3 and protrudes from the rear end portion of the exterior body is pressed, the writing instrument body 3 moves forward against the rearward biasing force. The convex portion 11a of the rotor 11 at the retracted position in the window hole 1e is formed on the rear end surface of the concave portion 3f formed on the large-diameter portion 3c of the writing instrument main body 3 with the rear end face of the writing instrument main body 3 moving forward. The rotor 11 moves forward by being pushed by contact, and moves forward in the window hole 11e. The convex portion 11a is in contact with the first inclined wall 12f protruding from the back surface of the clip opposite base end portion 12e located in the front, moves along the first inclined wall 12f, and forms a protruding state. When guided to the front of the joint 1u and abuts against the side surface 12h of the third inclined wall 12g, the forward movement of the convex portion 11a is restricted, and the forward movement operation of the writing instrument body 3 is completed.
When the pressure on the tail plug 7 is released, the writing instrument main body 3 biased backward moves backward along the axis of the writing instrument main body 3. At this time, the rotor 11 is also retracted simultaneously with the writing instrument body 3. When the writing instrument main body 3 is retracted, the convex portion 11a of the rotor 11 moved to the front of the inclined surface of the engaging portion 1u forming the protruding state is retracted together with the retracting of the writing instrument main body 3.
At this time, the protrusion 3j formed in the recess 3f comes into contact with the auxiliary inclined surface 11h of the auxiliary recess 11g that assists the rotation of the rotor 11 formed in the rotor 11 in the circumferential direction, and the protrusion of the rotor 11 11a guides toward the engaging part 1u which forms a protrusion state.
The rotor 11 is rotated by the inclined surface of the engaging portion 1u that forms a protruding state with the convex portion 11a of the rotor 11, the auxiliary inclined surface 11h of the auxiliary concave portion 11g on the rear end surface of the rotor 11, and the protruding portion 3e of the writing instrument body 3. The child 11 is guided to the engaging portion 1u that reliably forms the protruding state. When the convex portion 11a of the rotor 11 is engaged with the engaging portion 1u that forms the protruding state, the movement of the rotor 11 is stopped, and the retraction of the writing instrument body 3 is also stopped as the rotor 11 stops. At this time, the pen tip 2 disposed on the writing instrument main body 3 is in a protruding state from the tip opening 1a of the exterior body 1, and the operation from the retracted position of the convex portion 11a of the rotor 11 to the protruding position is completed.

When the tail plug 7 is further pressed, the rotor 11 and the convex portion 11a of the rotor are moved forward along with the writing instrument body 3 moved forward. The third inclined wall 12g is located in front of the convex portion 11a, and the convex portion 11a contacts the third inclined wall 12g. When the convex portion 11a further advances, the convex portion 11a slides along the third inclined wall 12g, and the third inclined wall 12g is moved upward. Since the third inclined wall 12g is formed in the clip 12 together with the first inclined wall 12f, the clip 12 is deformed by the advance of the convex portion 11a, and the non-base end portion 12e is moved upward, and the convex portion 11a is It passes through the first inclined wall 12f along the bottom surface of the first inclined wall 12f and further moves forward.
As shown in FIG. 18, the convex portion 11 a that has moved forward contacts the second inclined wall 1 n formed at the front end portion of the window hole 11 e of the exterior body 1. When the writing instrument body 3 further advances, the convex portion 11a moves in the direction of the retracted position while moving forward along the second inclined wall 1n.
The convex portion 11a reaches the connecting portion of the side edge portion 1m opposite to the side where the engaging portion 1u forming the protruding state with the second inclined wall 1n is present, and there is the engaging portion 1u forming the protruding state. When it abuts against the side edge 1m opposite to the side, the forward movement of the projection 11a is restricted, and the forward movement of the writing instrument body 3 is completed.
On the bottom surface of the first inclined wall 12f of the clip opposite base end portion 12e, a groove portion 12j extending in the front-rear direction is formed in front of the narrow portion 1f of the window hole 1e of the exterior body 1, and the convex portion 11a is formed. If it passes, it will fall into this groove part 12j and an impact sound will generate | occur | produce. The groove portion 12j is disposed at a position where the convex portion 11a falls immediately before coming into contact with the side edge portion 1m opposite to the side where the engaging portion 1u where the protruding portion 11a forms a projecting state, and serves as a function of notifying the pressing operation of the tail plug 7. Yes. The groove 12j is a thing for generating an impact sound and may not be provided.
When the pressure on the tail plug 7 is released, the writing instrument main body 3 biased backward moves backward along the axis of the writing instrument main body 3. The rotor 11 is temporarily stopped by the repulsive force accompanying the deformation of the opposite base end portion 12e of the clip 12, and pressed against the front end surface of the rotor 11 and the front end surface of the concave portion 3f of the large diameter portion 3c of the writing instrument body 3. The projection 11a of the rotor 11 is retracted along the side edge 1m opposite to the side on which the engaging portion 1u forming the protruding state of the window hole 1e of the exterior body 1 is located. Return. At this time, the protrusion 3j formed in the recess 3f of the large diameter portion 3c engages with the restriction recess 11f for restricting the rotation of the front end portion of the rotor 11 in the circumferential direction. Therefore, the rotor 11 can surely return to the retracted position without rotating in the process of retreating.

In the present embodiment, the first inclined wall 12f and the third inclined wall 12g are formed on the opposite base end portion 12e of the clip 12, but are provided not on the clip 12 but on the window hole 1e of the exterior body 1, and the rotor 11 It can also be formed so that it can move up and down by the forward movement of the projection 11a. By arranging the window hole 11e of the exterior body 1 so that the clip 12 covers it, the window hole 11e can be hidden from the appearance, and the appearance is improved.
Further, in the present invention, the engaging portion 1u forming the protruding state is provided in the step portion 1h of the narrow portion 1f and the wide portion 1g of the window hole 1e of the exterior body 1, but the step portion 1h is directed rearward. It is also possible to form an engaging portion 1u that forms an inclined surface from the back surface of the clip opposite base end portion 12e with an inclined surface from the side edge portion 1j of the wide portion toward the side edge portion 1k of the narrow portion. .
In this case, when the clip 12 is lifted in the pen tip protruding state, the convex portion 11a of the rotor 11 engaged with the engaging portion 1u forming the protruding state formed on the back surface of the clip opposite base end 12e is detached. It is possible to return to the retracted position by being guided by the inclined surface, and a so-called safety mechanism can be obtained.

DESCRIPTION OF SYMBOLS 1 Exterior body 1a Front end opening part 1b Rear end opening part 1c Bearing part 1d Reception surface 1e Window hole 1f Narrow part 1g Wide part 1h Step part 1j Side edge part of a wide part 1k Front edge part of a wide part 1m Opposite side edge Part 1n Second inclined wall 1o Clip mounting part 1p Protruding part 1q Inclined surface 1r Front engaging hole 1s Rear engaging hole 1t Engaging part forming an immersion state 1u Engaging part forming a protruding state 1v Cam part 2 Pen Tip 2a Pen core 2b Pen tip holder 3 Writing instrument body 3a Shaft tube 3b Small diameter part 3c Large diameter part 3d Shoulder part 3e Protrusion 3f Recessed part 3g Short C-shaped part 3h Long C-shaped part 3i Front edge part 3j Projection 4 Lid 4a Lid 4b Side wall 4c Rotating shaft 4d Inner cam 4e Outer cam 4f Rotating cam 5 Ring elastic body 6 Ink occlusion body 7 Tail plug 7a Rib 8 Coil spring 9 Ring member 9a Connection b Side wall portion 9c Contact surface 9d Inclined surface 9e Locking groove 9f Projection 9g Middle hole portion 9h Step portion 10 Annular elastic body 10a Outer sealing rib 10b Outer tilt prevention rib 10c Inner sealing rib 10d Receiving groove portion 11 Rotor 11a Protruding portion 11b C-shaped part 11c Extension part 11d Back inclined surface 11e Front inclined surface 11f Restriction recessed part 11g Auxiliary recessed part 11h Auxiliary inclined surface 12 Clip 12a Base end part 12b Projection part 12c Front engagement protrusion 12d Back engagement protrusion 12e Anti-base end part 12f First 1 inclined wall 12g 3rd inclined wall 12h Side surface extended backward 12i Inclined surface

Claims (1)

  A ring having a convex portion is arranged on a writing instrument main body that is urged rearward by an elastic member and is arranged to be movable back and forth in the outer body so that the ring can be rotated on the periphery of the writing instrument main body. An engaging portion that forms a protruding state from the outer end opening of the exterior of the pen nib at the tip of the writing instrument main body, the convex portion of the ring being moved by the longitudinal movement of the writing instrument main body, and an immersion state In the retractable writing instrument having a guide path having an engaging portion that forms a first inclined wall that shifts and guides the convex portion of the ring in the circumferential direction of the writing instrument body, and the first inclined path. By providing a second inclined wall that is displaced and guided in the circumferential direction opposite to the wall, it is possible to guide to the engaging portion of the pen tip protruding state or the engaging portion of the pen tip retracting state, and the convexity of the ring The first inclined wall or the second inclined wall A third inclined wall that is displaced and guided in the radial direction of the writing instrument body in order to pass through the guide is provided in a guide path between the first inclined wall and the second inclined wall, A retractable writing instrument in which two inclined walls are arranged at the same axial direction position of the writing instrument body.

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