JP7255732B2 - haunting writing instrument - Google Patents

Description

According to the present invention, a writing instrument body having a pen tip at its tip, which is housed in an exterior body, is moved back and forth by an operation, and a protrusion arranged on the side of the writing instrument body protrudes through a guide path formed in the exterior body. The present invention relates to a retractable writing instrument in which a pen tip is guided to a locking portion and a pen tip retraction locking portion to form a protruding state and a recessed state of the pen tip from an opening at the front end of an exterior body.

2. Description of the Related Art Conventionally, as a retractable writing instrument in which a pen tip is retracted from the tip of an outer case by an operation, one using a cam mechanism is known. For example, the body of the writing instrument, which is urged backward by an elastic member such as a coil spring in the outer case, is moved forward by a knocking operation against the repulsive force of the elastic member, thereby forming a groove formed in the outer case. A protruding part or the like of the writing instrument main body is guided along a guide path so that the protruded state and retracted state of the pen tip can be formed. Known for its excellent operability, the pen tip can be retracted and retracted simply by knocking.

For example, in the retractable writing instrument described in Japanese Patent Application Laid-Open No. 11-321182 (Patent Document 1), a convex portion (locking portion 26a) arranged on the side of the writing instrument main body is arranged in a guide path provided in the exterior body. to lock the pen tip in the guide path to the locking recess that forms the protruding state of the pen tip and the rear end position that forms the recessed locking state, respectively. A haunting type writing instrument that can be haunted is described.

JP-A-11-321182

However, in the retractable writing instrument described in Patent Literature 1, the protrusion (locking portion 26a) avoids the locking receiving portion (28b) when the locking is released, so the guide path extends in the circumferential direction. Therefore, the outer diameter of the exterior body must be increased, which limits the design.

It is an object of the present invention to provide a retractable writing instrument that facilitates retraction of the pen tip, does not impair operability, has a slender outer body, and has a high degree of freedom in exterior design.

The present invention comprises an exterior body, and a writing instrument main body that is housed in the exterior body so as to be movable back and forth and has a pen tip provided at the tip and a convex portion provided on the side, and the exterior body. The body has a guide path for guiding the convex portion to the pen tip protrusion locking portion and the pen tip retraction locking portion, and the writing instrument main body moves back and forth so that the convex portion engages the pen tip projection locking portion. and a projecting state in which the pen tip is projected from the opening at the tip of the outer body by engaging with a portion, and a protruding state in which the pen tip is retracted into the outer body by engaging the protruding portion with the pen tip retraction locking portion. A circumferential guiding slanted wall that guides the convex portion in the circumferential direction of the exterior body, and a radial guiding slanted wall that guides the convex portion in the radial direction of the exterior body. , are provided so as to be able to come into contact with the convex portion moving in the guide hole, and the side wall of the radial guide inclined wall is adapted to move the convex portion in the circumferential direction guided by the circumferential inclined wall. The gist of the invention is a retractable writing instrument as a movement regulating part for regulation.

In the retractable writing instrument of the present invention, an inclined wall for guiding the projection in the circumferential direction of the exterior body and an inclined wall for guiding the projection in the radial direction of the exterior body are provided in the guide path formed in the exterior body. The side wall of the inclined wall that guides in the radial direction is used as a circumferential movement restriction portion of the inclined wall that guides in the circumferential direction, and the inclined wall that guides the convex portion in the radial direction is used as a circumferential movement restriction portion of the convex portion. Therefore, it is not necessary to form the guide path as the locus of movement of the convex part as a path avoiding the engaging part. To provide a retractable writing instrument having a thin shaft and a high degree of freedom in appearance design.

In addition, the protrusion in the guide path is more likely to retract the pen tip from the pen tip projection locking portion than the wall portion forming the most advanced position of the path from the pen tip retraction locking portion to the pen tip projection locking portion. By arranging the wall portion forming the most advanced position on the way to the locking portion at the rear, the pen tip protrudes more than when moving the convex portion from the pen tip recessing locking portion to the pen tip protruding locking portion. Since the lock can be released with a short operation stroke when moving from the locking portion to the pen tip retraction locking portion, the pen tip retraction operation can be easily performed, and the pen tip can be stored in the exterior body. Malfunction such as failing to do so is less likely to occur.

Longitudinal sectional view showing the whole of the present embodiment Vertical cross-sectional perspective view of the tip of the exterior body 1 Vertical cross-sectional front view of the tip of the exterior body 1 Rear enlarged perspective view of exterior body 1 Rear enlarged front view of exterior body 1 Perspective view of writing instrument main body 2 Vertical cross-sectional front view of writing instrument main body 2 Front view of nib 3 Vertical cross-sectional front view of pen tip holder 15 Perspective view of the tip portion of the writing instrument main body 2 Perspective view of the rear portion of the writing instrument main body 2 Front view of operation member 8 Vertical cross-sectional front view of the operation member 8 A view of the operation member 8 viewed from the front, which is the direction in which the ink occluding body 14 is inserted. Perspective view of lid body 9 Side view of lid body 9 Cross-sectional front view showing the inside of the lid body 9 A perspective view of the annular member 13 Vertical cross-sectional perspective view of the annular elastic body 12 Perspective view of clip 4 View from below clip 4 Perspective view of base 5 Side view of base 5 Longitudinal cross-sectional view of base 5 View from below the base 5 Perspective view of rotor 7 A view of the rotor 7 from above Perspective view of each part of this writing instrument FIG. 11 is a longitudinal cross-sectional front view of the front engaging projection 5a and the rear engaging projection 5b of the base 5, showing how the base 5 is fitted into the exterior body 1; A vertical cross-sectional view cut from the center of the base 5 showing how the base is fitted into the exterior body 1. The front view which arrange|positioned the base 5 to the exterior body 1, and was seen from the back. Front vertical cross-sectional front view of the writing instrument for explaining the rotation of the lid 9 and the forward movement of the writing instrument main body 2. Front vertical cross-sectional front view of the exterior body 1 and the annular elastic body 10 of the present writing instrument for explaining the rotation of the lid body 9 and the forward motion of the writing instrument main body 2. Stage (1) front enlarged front view of FIG. Stage (2) front enlarged front view of FIG. Stage (3) front enlarged front view of FIG. Stage (4) front enlarged front view of FIG. Stage (5) front enlarged front view of FIG. Stage (6) front enlarged front view of FIG. Front view from above, showing the guide path of the writing instrument Partial enlarged front view of FIG. The figure which shows a mode that the convex part 7a of the rotor 7 advances. The figure which shows a mode that the convex part 7a of the rotor 7 is guided by 4 d of 1st inclination walls. The figure which shows after the convex part 7a of the rotor 7 was guided by the 2nd inclined wall 1o. The figure which shows a state that the convex part 7a of the rotor 7 engaged with the pen point protrusion latching|locking part 1p. The figure which shows a state that the convex part 7a of the rotor 7 advances from the pen point protrusion latching|locking part 1p, and is guided by the 3rd inclined wall 4e. The figure which shows after the convex part 7a of the rotor 7 is guided by the 3rd inclined wall 4e. FIG. 48 is a diagram showing a state in which the protrusions 7a of the rotor 7 are retracted from the state of FIG. 47 and are guided by the fourth inclined wall 1q;

In the retractable writing instrument of the present invention, the body of the writing instrument is housed in an exterior body having an opening at the tip so as to be able to move back and forth, and the pen tip of the body of the writing instrument at the tip can be retracted from the opening at the tip of the exterior body. be.

The exterior body can be one part or an assembly of two or more parts such as a front barrel and a rear barrel, and the writing instrument main body can be replaceable. In order to prevent the pen tip from protruding and retracting from the tip opening of the exterior body, an elastic member such as a coil spring is arranged in the exterior body, and the writing instrument body is always urged backward to prevent the pen tip from protruding or retracting. It is possible to maintain the locked state of immersion. In addition, for the operation of setting the writing instrument main body in the retractable locking state, a structure known for conventional retractable writing instruments can be appropriately employed, such as arranging a knock crown on the rear end or arranging an operation piece on the side.

The main body of the writing instrument has a pen point at its tip, and has a convex portion on its side for locking in and out as described above. Pen nibs include ballpoint pen tips, fiber bundles, porous materials such as urethane, and synthetic resins with through holes, and pen refills that allow the built-in ink to pass through, as well as pencil leads that form handwriting by self-wearing. A retractable mechanical pencil or the like can be used as appropriate. In addition, the member constituting the main body of the writing instrument may be an injection-molded product of synthetic resin, a compositionally modified product of metal material, or a combination thereof.
When the body of the writing instrument is of the pen refill type containing ink, the ink to be contained may be impregnated in a fiber bundle or the like, may be contained in an ink tank in a free state, or may be contained in a pipe. An ink follower, such as a high-viscosity fluid, may be arranged at the trailing end of the directly accommodated ink to contact and follow the ink interface that moves as the amount of ink decreases. The ink to be accommodated may be water-based ink containing water as a main medium or oil-based ink containing an organic solvent as a main medium, and dyes, pigments, or both dyes and pigments may be used as coloring components. In addition, rheological properties such as ink viscosity and shear thinning property can be adjusted by dissolving polysaccharides or resin components or by dispersing fine particles. In addition to ink, it is also possible to store liquid cosmetics and the like.

Protrusions formed on the sides of the writing instrument main body for locking the pen tip in and out can be appropriately selected by providing them integrally with the parts constituting the sides of the writing instrument main body, or by assembling and disposing separate members having protrusions. can.

The outer body is formed with a guide path along which the convex portion of the writing instrument body moves as the writing instrument body is moved back and forth. It has a pen tip projection locking portion that forms a protruded state from the opening of the front end of the outer body and a pen tip retraction locking portion that forms a retracted state. Both types of locking can be locked in a state of being pressed against the wall of the guide path by the biasing force of the coil spring described above. can be

The guide path may be, for example, a hole or groove provided in the barrel portion of the exterior body, or a hole or groove formed in a portion of the exterior body projecting outward, such as a clip. In any case, it is sufficient that the convex portion on the side of the body of the writing instrument serves as a guide for sliding contact and movement. When the body of the writing instrument is urged backward by an elastic member such as a coil spring, the writing instrument body is locked in a state of being pressed against the elastic member by the pen nib retraction system stopper disposed behind the guide path, and the pen tip is elastically repelled. When the body of the writing instrument is moved forward against the member, the protruding portion of the body of the writing instrument is slidably guided by the pen tip protruding engagement portion arranged on the front side, and the pen tip is pushed forward by the rear biasing force of the repulsive member. It is locked in the projecting state.

In order to lock each of the protruding state and retracted state of the pen tip, each locking portion receives the urging force of the resilient member and the fitting force of the concave-convex fitting to lock the convex portion. A wall portion is required as a contacting portion, and at least a route bypassing the wall portion of the pen tip projecting locking portion located on the front side is required. In order to guide the detour path, the guide path includes a circumferential guiding inclined wall that guides the convex portion in the circumferential direction of the exterior body, and a radial guide wall that guides the convex portion in the radial direction of the exterior body. forming a guiding sloping wall. In particular, in the retractable writing instrument of the present invention, the side wall of the radial guide inclined wall is a wall portion as a portion with which the convex portion engages and makes contact, and serves as a movement restricting portion for restricting the circumferential movement of the convex portion. As a result, the inclined wall that guides the convex portion in the radial direction also serves as a circumferential movement restriction portion for the convex portion that moves in the circumferential direction by the inclined wall that guides the convex portion in the circumferential direction. Since the width of the direction can be narrowed, the shaft of the retractable writing instrument can be thinned.

In addition, in the guide path, the protruding portion of the writing instrument main body has a forward path from the pen tip retraction locking portion to the pen tip projection locking portion, and a path from the pen tip projection locking portion to the pen tip retraction locking portion. In the return path, the operation strokes in the forward path and the return path can be made different by differentiating the walls that form the respective most advanced positions. Since the width of circumferential movement is narrowed by setting the side wall of the slanted radial guide wall to be narrow, the slanted circumferential guide wall that guides the convex portion to the leading edge position of each of the forward and backward passes is arranged in the radial direction of the exterior body. The width of the guideway can be minimized by forming it in a laminated manner.

An embodiment of the present invention will be described. In this embodiment, the direction of the nib of the writing instrument is forward, the opposite is backward, the direction from the longitudinal axis of the writing instrument to the clip arranged on the outer wall of the writing instrument is upward, and the opposite direction is the axis. is defined as the downward direction, and the line connecting the axis of the writing instrument and the clip and the direction perpendicular to the axis are defined as the lateral direction.

As shown in FIG. 1, a writing instrument main body 2 having a pen tip 3 at its tip is housed inside the exterior body 1 so as to be movable back and forth. A front end opening 1a is provided at the front end of the exterior body 1 as a projection opening for the pen tip 3, and a rear end opening is provided at the rear end as a projection opening for an operation member 8 for moving the writing instrument body 2 back and forth. A portion 1b is provided. An annular elastic body 10 abutting on the lid 9 is fitted and fixed to the inner surface of the tip opening 1a. It abuts and cuts off ventilation with the outside.

A coil spring 11 having a rear end in contact with a shoulder portion 2c of the writing instrument body 2 is disposed inside the exterior body 1 to urge the writing instrument body 2 rearward. An annular elastic body 12 is fitted in the small-diameter portion 2a of the writing instrument body 2, and the front end of the coil spring 11 is brought into contact with the annular elastic body 12 to bias the cover body 9 forward through the annular member 13. are doing. The annular elastic body 12 is in airtight sliding contact with the inner wall of the exterior body 1 to form a rear closed state of the space in which the pen tip 3 exists. The space where the front 3 exists can be cut off from the outside air. A rotor 7, which is a ring having projections 7a, is arranged on the writing instrument main body 2 so as to be rotatable on the periphery and restricted from moving forward and backward. An ink absorbing body 14 impregnated with ink is housed inside the writing instrument main body 2 .

A clip 4 is arranged on the rear side surface of the exterior body 1 via a base portion 5 and a coil spring 6 .

As shown in FIG. 2, which is a vertical cross-sectional perspective view of the distal end portion of the exterior body 1, and FIG. A fixing portion 1G into which an annular elastic body 10 having a small diameter can be fitted is formed in the rear portion, and a bearing portion 1c extends rearward from the inner surface of the exterior body 1 so as to face the fixing portion 1G. Walls are provided on the front and top and bottom of the bearing portion 1c to restrict the movement of the rotating shaft 9c of the lid 9. As shown in FIG. The distance between the walls (opening stopper 1h and closing stopper 1i) provided above and below the front wall (receiving surface 1d) must be sufficient for the rotating shaft 9c to move up and down. Therefore, the bearing portion 1c has a concave shape elongated upward.

Further, the receiving surface 1d is formed with an open recess 1e and a closed recess 1f which are tapered so that the distance between the side surfaces decreases toward the front of the exterior body 1. As shown in FIG. Between the open recess 1e and the closed recess 1f, a tapered surface connecting the open recess 1e and the closed recess 1f is provided, and a central protrusion 1g extending rearward from the receiving surface 1d is formed. The top of the central projection 1g contacts with a recessed cam portion 9g formed on the rotating shaft 9c of the lid 9, so that it forms an R-curved surface.

The open recess 1e, the closed recess 1f, and the central protrusion 1g are portions (rack portions) corresponding to the teeth formed on the bearing portion 1c.

At both ends of the rack portion, an opening stopper contact wall 1h and a closing stopper contact wall 1i are respectively contacted by an opening stopper 9h and a closing stopper 9i that define the end points of the opening and closing operations of the lid 9. formed. The closing stopper contact wall 1i is formed longer rearward than the opening stopper contact wall 1h so as to face the side wall portion 13b of the annular member 13 .

In the opening recess 1e, when the lid 9 is in the open state, an opening cam projection 9f formed on the rotating shaft 9c of the lid 9 abuts the bottom of the opening recess 1e. When it is in the closed state, the bottom of the closing cam projection 9d of the lid body 9 abuts to restrict the forward movement of the lid body 9. As shown in FIG. The rear portion of the bearing portion 1c is an open portion without a wall. The rearward movement of the lid body 9 is restricted by the contact surface 13c of the annular member 13 arranged behind the lid body 9. As shown in FIG.

As shown in FIG. 4, which is an enlarged rear perspective view of the exterior body 1, and FIG. A window hole 1k, which is a guide path, is formed. The window hole 1k is formed at the rear end of the exterior body 1 so that when the writing instrument main body 2 is inserted from the rear end opening 1b of the exterior body 1, a projection 7a formed on the outer peripheral side surface of the rotor 7 described later can easily enter. It is formed from the opening 1b. The window hole 1k has a narrow portion 1m slightly wider than the protruding portion 7a of the rotor 7 at the rear, and a wide portion 1n wide on one side in the circumferential direction at the front. A second inclined wall 1o is provided in front of the wide portion 1n of the window hole 1k. A pen tip projection locking portion 1p that forms a protruded state from the tip opening 1a of the pen tip 3 is formed on the rear side in the circumferential direction opposite to the narrow portion 1m of the second inclined wall 1o. there is Since the second inclined wall 1o is inclined forward from the narrow width portion 1m side to the pen tip projection locking portion 1p side, the protruding portion 7a of the rotor 7 is displaced and guided in the circumferential direction. can do. A fourth inclined wall 1q is formed behind the wide portion 1n of the window hole 1k. The fourth inclined wall 1q is inclined rearward from the side of the protruding locking portion 1p to the side of the narrow portion 1m, so that it guides the convex portion 7a of the rotor 7 in the circumferential direction. be able to.

Further, behind the narrow portion 1m of the window hole 1k of the exterior body 1, a protrusion 1r formed by further reducing the width of the narrow portion 1m is formed so as to face each other. The projecting portion 1r has a substantially trapezoidal shape including a stepped portion 1s and an inclined surface 1t in which the width of the window hole is narrowed as the rear side faces toward the front. The protrusion 7a of the rotor 7 inserted from 1b can easily pass through, and furthermore, it serves to restrict the rearward movement of the writing instrument main body 2 biased rearward by the coil spring 10. As shown in FIG. This projection 1r serves as a temporary restraint when assembling the clip 4, and even if this projection 1r is damaged during use of the writing instrument, the projection 4g provided at the base end 4a of the clip 4, which will be described later, is immediately behind. , and serves as a pen tip retraction locking portion 1u, so that the writing instrument main body 2 can be restrained from being biased toward the rear.

In this window hole 1k, a guide path 1v is formed having a pen tip protruding locking portion 1p and a pen tip retracting locking portion 1u.
A base attachment portion 1w for attaching the base portion 5 forward from the rear end opening 1b of the exterior body 1 is formed on the outer peripheral surface behind the protrusion 1r.
In this way, the exterior body 1 has a sealing portion that houses the pen tip 3 in a state of blocking ventilation with the outside at the front, a base attachment portion 1w to which the base for attaching the clip 4 is attached, and a base attachment portion at the rear. It is composed of a guide path 1v formed in front of 1w. In the present invention, the exterior body 1 is composed of a single part, but depending on the moldability and assembling efficiency, the exterior body 1 may be formed by integrating a plurality of parts by screwing or fitting and press-fitting them with uneven portions. .

The base mounting portion 1w includes a bridging portion 1A formed so as to bridge both edges of an outer peripheral surface having a substantially C-shaped cross section formed by a window hole 1k, and a top surface of the bridging portion 1A formed on both sides of the bridging portion 1A. and an engaging portion 1B having a flat surface that is one step lower. By forming in this manner, deformation of the rear side of the exterior body 1 having a substantially C-shaped cross section due to the window hole 1k formed from the rear end opening 1b of the exterior body 1 can be suppressed.

In addition, engaging holes (front engaging hole 1C, rear engaging hole 1D) are formed in the engaging portion 1B of the base mounting portion 1w.

Blindfold walls 1E are formed on both side surfaces of the base mounting portion 1w so that the connecting portion with the base portion 5 cannot be seen from the side.

A protection wall 1F extending forward is formed on the outer peripheral surface of the exterior body 1 along the window hole 1k from the front end of the base mounting portion 1w. It serves to protect the protruding portions 7a of the rotor 7 protruding from the outer peripheral surface of the exterior body 1 in the immersed state. Furthermore, the front end surface of the protective wall 1F is inclined so that the height gradually decreases toward the front, so that paper or the like can be guided without being caught by the clip when not in use.

The writing instrument main body 2 is made of polypropylene with low gas permeability and good moldability, has a pen tip 3 at the tip, and has an ink absorbing body 14 inside.

As shown in FIG. 6, which is a perspective view of the writing instrument main body 2, and FIG. 7, which is a longitudinal cross-sectional front view of the writing instrument main body 2, the writing instrument main body 2 has through holes with openings at the front and rear ends.

The main body 2 of the writing instrument has a small-diameter portion 2a, a large-diameter portion 2b, and a shoulder portion 2c therebetween. 2b accommodates the ink occluding body 14;

The pen tip 3 shown in FIG. 9, which is a front view of the pen tip 3, consists of a writing portion 3a and a connecting portion 3b connected to an ink absorbing body 14 having a smaller diameter than the writing portion 3a. The writing portion 3a of the pen tip 3 is press-fitted and fixed to a pen tip holder 15, which will be described later, so that the portion exposed from the tip of the pen tip holder 15 can be used for writing.

The connecting portion 3b of the pen tip 3 is formed with a tapered portion 3d that tapers from a portion of the rear portion toward the rear end. It is connected in a submerged manner so that ink can communicate with it. By providing the tapered portion 3d in the connecting portion 3b, the connection to the ink occluding member 14 is facilitated. Since the connection part 3b is inserted into the ink occluding body 14, the ink occluding body 14 is pressed from the inside, and the fiber density of the pressed portion of the ink occluding body 14 gradually increases, so that the ink is impregnated into the ink occluding body 14. Capillary force makes it easier for the ink to move to the side with the higher fiber density, and the ink supply to the pen tip 3 is ensured.

As shown in FIG. 9, which is a longitudinal cross-sectional front view of the pen tip holder 15, the pen tip holder 15 is a cylindrical body having a press-fit fixing portion 15a for press-fitting and fixing the pen tip 3 to the front. It is inserted until the stepped portion 15c formed between the portion 3a and the connecting portion 3b and the stepped portion 15b of the press-fit fixing portion 15a come into contact with each other. The pen tip holder 15 is press-fitted and fixed inside the small diameter portion 2a of the writing instrument main body 2. As shown in FIG. Since the pen tip holder 15 is a molded part and is made of polypropylene, when the pen tip holder 15 is press-fitted into the writing instrument main body 2, the small diameter portion 2a of the writing instrument main body 2 expands in diameter. Therefore, the outer diameter of the pen tip holder 15 and the inscribed diameter of the holding rib 2d formed on the inner surface of the small diameter portion 2a of the writing instrument main body 2 are loosely press-fitted. However, in order to maintain the strength with which the pen tip holder 15 is removed from the writing instrument main body 2, a groove 15c is provided in the intermediate portion of the pen tip holder 15, and the holding rib 2d of the writing instrument main body 2 is attached to the groove 15c. The C-shaped pen tip pressing protrusion 2e formed on the rear side is caught. This prevents the pen tip holder 15 from falling off from the writing instrument main body 2 .

A rib 2f is formed on the inner wall of the large-diameter portion 2b of the writing instrument body 2 for accommodating the ink occluding body 14, and guides the ink occluding body 14 when it is inserted.

In front of the outer peripheral surface of the large-diameter portion 2b, an anti-shake rib 2r is formed on the opposite side surface of the projection 2l to prevent the writing instrument main body 2 from wobbling in the radial direction when it moves back and forth within the exterior body 1. ing.

Further, on the rear inner surface of the large-diameter portion 2b of the writing instrument main body 2, there is provided a female screw portion 2s for screwing with an operation member 8, which will be described later, and a convex portion 2t in front of the female screw portion 2s for making the internal space liquid-tight. is formed circumferentially.

As shown in FIG. 10, which is a perspective view of the tip portion of the writing instrument main body 2, the front end surface of the writing instrument main body 2 has a concave curved surface 2g that abuts against the inner cam portion 9j of the lid body 9 and imparts a rotational force to the lid body 9. is provided. The concave curved surface 2g of the writing instrument main body 2 is a concave curved surface having first and second curvature radii. It is a curved surface larger than the radius, and the two curved surfaces are connected gently so as not to form an angle as much as possible. The inner cam portion 9j of the lid body 9 moves on the concave curved surface 2g from the second curved surface to the first curved surface. A chamfered portion 2h is formed on a part of the concave curved surface 2g. This is provided so that the lid body 9 rotates and the inner cam portion 9j smoothly separates from the concave curved surface 2g of the writing instrument main body 2. As shown in FIG. As a result, wear of the corners of the inner cam portion 9j and the concave curved surface 2g can be reduced, and the device can be used for a long time without malfunction even after repeated use.

Between the inner surface of the small diameter portion 2a of the writing instrument body 2 and the outer surface of the pen tip holder 15, an air groove 2k is provided in the writing instrument body 2 so that gas can pass between the interior and exterior of the writing instrument body 2.

As shown in FIG. 11, which is a perspective view of the rear portion of the writing instrument main body 2, a projection 2l is formed upward on the rear outer peripheral surface of the large-diameter portion 2b of the writing instrument main body 2. It protrudes outside the exterior body 1 through the provided window hole 1k. The projection 2l is engaged with the pen tip retraction locking portion 1u in order to maintain the pen tip 3 retracted state of the pen tip 3 of the writing instrument main body 2 which is biased backward.

A recess 2m is formed in front of the projection 2l for rotatably disposing a rotor 7 having a C-shaped cross section, which will be described later. The recessed portion 2m has a C-shaped cross section that matches the cross-sectional shape of the rotor 7, so that it does not interfere with the rotor 7 within the range in which it rotates.

Further, the concave portion 2m has a C-shaped portion 2n with a short leg in the front and a C-shaped portion 2o with a long leg in the rear.

As shown in FIG. 12, which is a front view of the operating member 8, the operating member 8 is exposed from the rear end opening 1b of the exterior body 1, and is inserted forward with a knock portion 8a for pressing the writing instrument main body 2. A portion 8b is formed, and the insertion portion 8b is fluid-tightly screwed into the large-diameter portion 2b of the writing instrument main body 2 in an inserted state, and the ink occluding body 14 is interposed up to the inner space of the operation member 8. There is. The male threaded portion 8c formed on the outer peripheral surface of the insertion portion 8b of the operating member 8 and the female threaded portion 2s of the writing instrument main body 2 are screwed together by a single thread, but may be a multiple thread. Also, if the writing instrument main body 2 and the operating member 8 can be attached and detached in a liquid-tight manner, they can be fitted together as a climbing rib. Furthermore, in order to make the operation member 8 and the writing instrument main body 2 liquid-tight in the inserted state, a concave abutment portion 8d that fits with the convex portion 2t of the writing instrument main body 2 is provided in front of the male screw portion 8c of the operating member 8. Although provided, the abutting portion 8d may be formed in a convex shape or a flat surface. By forming the contact portion 8d into a concave shape, the operation member 8 can be inserted without contacting the female screw portion 2s formed in the writing instrument main body 2 and damaging the surface of the contact portion 8d.

As shown in FIG. 13, which is a vertical cross-sectional front view of the operating member 8, and FIG. A plurality of ribs 8e are formed on the wall, especially the rib 8e on the inner wall extends in the longitudinal direction, and the space between the inside of the operating member 8 and the ink absorbing body 14 communicates with the inner space of the writing instrument main body 2. In addition, the ink occluding body 14 is sandwiched between the ribs 8e so that the ink occluding body 14 is removed together with the writing instrument body 2 when the operation member 8 is removed from the writing instrument body 2. There is. On the other hand, the plurality of ribs 2f of the writing instrument main body 2 serve as guides when the ink occluding body 14 is inserted. It is not held by the plurality of ribs 2 f of the writing instrument body 2 . The ink occluding member 14 is held by the connecting portion 3b of the pen tip 3 and the plurality of ribs 8e of the operating member 8, which are connected from the front end. By doing so, when the ink impregnated in the ink occluding body 14 is consumed and becomes less or the ink runs out, the ink occluding body 14 is pulled out together with the operation member 8, and the ink is impregnated again or the ink is removed. The entire occluding body 14 can be exchanged. The plurality of ribs 8e on the inner wall of the operating member 8 have a plate-like cross section, and the diameter of the inscribed circle and the width of the top surface that contacts the ink occluding member 14 are constant. The front end portions of the plurality of ribs 8e are formed with a tapered portion 8f that sinks into the inner surface of the operation member 8 as it goes forward. The tapered portion 8f serves as a guide for inserting the ink occluding body 14 into the operating member 8, so that the ink occluding body 14 can be accommodated in the operating member 8 without being caught.

A receiving rib 8g having a small inscribed circle diameter extends from the bottom portion of the inner wall of the operation member 8 behind the plurality of ribs 8e. The insertion of the ink occluding body 14 is completed when the end of the ink occluding body 14 comes into contact with the receiving rib 8g. By providing the receiving ribs 8g, a space is formed between the end of the ink occluding body 14 and the bottom of the inner wall of the operation member 8, and a plurality of ribs 8e serve as an air passage. Furthermore, it also plays a role of retaining ink when ink leaks from the ink occluding body due to impact or the like.

A recess 8h is formed in the center of the top surface of the operating member 8, and a stepped portion 8i having a larger diameter and a shallower depth than the recess 8h is formed.

The recessed portion 8h serves as a gate portion for injection molding, and is a deep groove so that the remaining gate portion generated during mold release does not protrude beyond the end surface of the operating member 8. As shown in FIG. The stepped portion 8i is a stepped portion for affixing a seal, and does not protrude beyond the end face of the tail plug 5. As shown in FIG. Furthermore, by attaching a sticker, the traces of the gate can be hidden and the appearance can be improved.

Further, the side walls of the ink occluding body 14 are covered with a synthetic resin film such as polyethylene, so that even if the ink occluding body 14 is replaced, the hands do not get dirty.

As shown in FIG. 15, which is a perspective view of the lid 9, the lid 9 is provided with a spherical lid 9a capable of covering the tip opening 1a of the outer package 1 and a cylindrical rotating shaft 9c projecting outward. side wall portion 9b. The top of the rotating shaft 9c is formed with a curved surface with an inclination so that the lid 9 does not interfere with the exterior body 1 when it rotates and moves inside the exterior body 1. As shown in FIG. Since the lid body 9 is provided with the notch portion 9l, the direction of the lid body 9 can be visually recognized, and the assembling efficiency is improved.

On the rotating shaft 9c of the lid body 9, when the side wall portion 9b is viewed from the direction (side surface) of FIG. An open cam projection 9f is formed to protrude in a direction opposite to the outer cam portion 9e at 90 degrees. Each of the closing cam projection 9d and the opening cam projection 9f is formed with an inclination such that the width thereof decreases with distance from the rotating shaft 9c. A concave cam portion 9g is formed toward the center of the rotating shaft 9c between the closing cam projection 9d and the opening cam projection 9f of the rotating shaft 9c. Both side surfaces of the concave cam portion 9g taper toward the center of the rotating shaft 9c in a direction that narrows the width thereof. connected by curved surfaces.

The closing cam projection 9d, the opening cam projection 9f, and the concave cam portion 9g are portions (gear portion) corresponding to gears partially formed on the rotating shaft 9c described above.

By forming a gear portion consisting of such a closing cam projection 9d, an opening cam projection 9f and a recessed cam portion 9g on the rotating shaft 9c, it is possible to approximately realize the rotation and vertical movement of the rotating shaft 9c as it rolls. be able to.

An opening stopper 9h and a closing stopper 9i are formed at both ends of the gear portion of the rotating shaft 9c to define the end points of the opening and closing operations of the lid body 9 by forming corners.

The opening stopper 9h regulates the end point of the opening operation of the lid 9, and the end point of the opening operation of the lid 9 is controlled by coming into contact with the planar opening stopper contact wall 1h formed in the bearing portion 1c of the exterior body 1. stipulate. On the other hand, the closing stopper 9i regulates the end point of the closing operation of the lid 9, and abuts against a planar closing stopper contact wall 1i formed in the bearing portion 1c of the exterior body 1 to regulate the closing operation of the lid 9. .

A space is formed between the side walls 9b of the lid 9, and when the lid 9 rotates and moves to open the front end opening 1a of the outer casing 1, the pen tip 3 and the writing instrument main body are separated from each other. 2 to form a passage through which .

Further, the outer cam portion 9e has a cam surface 9k, which receives the forward biasing force of the coil spring 11 via the annular member 13, and the cover body 9 receives force in the rotational direction.

As shown in FIG. 17, which is a cross-sectional front view showing the inside of the lid 9, an inner cam portion 9j, which is an inward projection, is formed inside the side wall portion 9b. The inner cam portion 9j is a portion that comes into contact with the writing instrument body 2 when the writing instrument body 2 advances.

In this embodiment, the inner cam portion 9j and the lid portion 9a are provided at the farthest position on the side wall portion 9b. By forming the inner cam portion 9j and the lid portion 9a at positions as far apart as possible, a wide space is provided between the lid portion 9a and the point of contact between the writing instrument main body 2 and the inner cam portion 9j of the lid body 9. In the closed state of the lid 9, the longitudinal distance from the tip position of the pen tip 3 to the point of contact between the main body 2 of the writing instrument and the inner cam portion 9j of the lid 9 can be increased. A long nib 3 can be provided at the tip of the main body 2. - 特許庁In addition, the distance from the inner cam portion 9j to the rotating shaft 9c can be increased, so that the lid body 9 can be rotated with a smaller knocking load.

Since the inner cam portion 9j receives a load from the writing instrument main body 2 and rotates and moves the lid 9, if the inner cam portion 9j is too small, it may be damaged during operation. 9, the cross-sectional area of the inner cam portion 9j is preferably 0.2 mm2 or more. However, if the inner cam portion 9j is enlarged, the point of contact between the inner cam portion 9j and the writing instrument main body 2 will move toward the rotating shaft 9c of the lid 9 during the rotation and movement of the lid 9. Since the distance from the center of rotation changes short, it is preferable to minimize the distance over which this contact point moves in terms of lightening the knocking load. Therefore, it is preferable that the diameter of the inner cam portion 9j is 0.4 mm or more and 5.0 mm or less, and the moving distance of the contact point is 3 mm or less.

The lid 9 uses polyacetal, which has self-lubricating properties and excellent frictional wear properties.

In the present invention, since the lid 9 is moved upward from the axis of the exterior body 1 while rotating, the inner edge of the tip opening 1a of the exterior body 1 with which the lid body 9 is in close contact is opened. Rotate away. Therefore, the sliding resistance between the lid 9 and the inner edge of the tip opening 1a is reduced, the abrasion of the lid 9 and the inner edge of the tip opening 1a is suppressed, and the tightness can be maintained. Therefore, for the cover body 9, even a material having somewhat inferior abrasion resistance can be appropriately selected. For example, polypropylene, polybutylene terephthalate, polyethylene, and polyethylene terephthalate, which are materials with low gas permeability, can be positively used.

Since the cover 9 is substantially U-shaped, the side wall portion 9b of the cover 9 tends to bend inward during injection molding of the component. In order to prevent this bending, a gate, which is a resin inlet of the mold, is arranged at the outer central portion of the lid portion 9a. In addition, the surface of the lid portion 9a is formed flat in order to achieve contact between the lid portion 9 and the tip opening portion 1a more quickly. Further, a head portion 9m is formed projecting from the surface of the lid portion 9a, and a gate is arranged on the top portion of the head portion 9m. In order to eliminate the influence of rubbing between the lid body 9 and the tip opening 1a due to the remaining gate, a recess 9n is formed around the remaining portion of the gate. In addition, the gate diameter is relatively large, and the gate diameter is set to 0.5 mm or more because bending after molding is less if the thermoplastic resin can be sufficiently held after flowing during molding. It is better to set it to 0.8 mm or less.

As shown in FIG. 18, which is a perspective view of the annular member 13, the annular member 13 has a connecting portion 13a that connects with the annular elastic body 12 and a side wall portion 13b that applies a forward biasing force to the lid body 9. As shown in FIG. A contact surface 13c is provided at the front end of the side wall portion 13b. A protrusion 13d is provided on the contact surface 13c. The side wall portion 13b transmits the elastic force of the rear coil spring 11 to the outer cam portion 9e of the lid body 9 via the contact surface 13c, and causes the lid body 9 to close the tip opening 1a of the exterior body 1. It gives rotational power.

The connecting portion 13a is formed with a hollow portion 13e through which the small diameter portion 2a of the writing instrument main body 2 can pass.

The outer surface of the side wall portion 13b is flat and forms a stepped portion 13f in the front-rear direction. When the stepped portion 13f is arranged in the exterior body 1, it faces a closing stopper abutting wall 1i formed at the end of the bearing portion 1c of the exterior body 1, which will be described later. Rotation around the axis of the exterior body 1 inside the body 1 is prevented.

Since the annular member 13 is a member that makes sliding contact with the cover 9 and rotates and moves the cover 9 up and down, polyacetal, which has self-lubricating properties and excellent frictional wear properties, is used.

As shown in FIG. 19, which is a vertical cross-sectional perspective view of the annular elastic body 12, the annular elastic body 12 extends outward from the inner surface of the exterior body 1 in a state where the tip opening 1a of the exterior body 1 is closed by the lid body 9. and an outer tilt prevention rib 12b that prevents the annular elastic body 12 from being too tilted when sliding in the exterior body 1. It has an inner sealing rib 12c on the inside, which is in sliding contact with the writing instrument main body 2 in an airtight manner. The inner sealing rib 12c is a two-row rib, and the refractory liquid, which will be described later, stays between these ribs, so that the sealing with the writing instrument main body 2 is ensured and the sliding resistance is kept low. there is Further, by shifting the forming positions of the outer sealing rib 12a and the inner sealing rib 12c in the axial direction, the outer sealing rib 12a is flexed inward due to contact with the outer body 1 and the inner sealing is performed due to contact with the writing instrument main body 2. Since the bending of the ribs 12c to the outside does not collide with each other in the radial direction, the sliding resistance is reduced when the writing instrument main body 2 moves and when the annular elastic body 12 moves backward.

A stepped portion 12 d for connecting to the connecting portion 13 a of the annular member 13 is formed at the front end portion of the annular elastic body 12 . A receiving groove 12e for receiving the coil spring 11 is formed behind the annular elastic body 12, and the front end portion of the coil spring 11 is in contact with the bottom surface of this receiving groove 12e. By forming the receiving groove 12e in this way, the distance between the coil spring 11 and the annular member 13 is shortened, and the deformation of the annular elastic body 12 due to the biasing force of the coil spring 11 can be minimized. biasing force is easily transmitted to the

The annular elastic body 12, the exterior body 1, and the writing instrument main body 2 seal the rear side of the pen tip sealed space. The outer sealing rib 12a performs sealing while sliding on the exterior body 1. As shown in FIG. 19) is smaller than the outer diameter of the writing instrument main body 2 (B portion in FIG. 10). C part) is set larger than the inner diameter of the exterior body 1 (D part in FIG. 3). , the magnitude of friction that acts as a load when the writing instrument main body 2 moves back and forth increases, so the sliding becomes worse. Therefore, in order to obtain a good knock feeling, it is preferable that the difference in diameter between each member is 0.1 mm or more and 0.4 mm or less as a range in which the knock load is 1 kgf or less and sufficient sealing is obtained. , the diameter difference between the inner sealing rib 12c and the writing instrument main body 2 is set to 0.3 mm, and the diameter difference between the outer sealing rib 12a and the exterior body 1 is set to 0.2 mm.

Materials for the annular elastic body 10 and the annular elastic body 12 that keep the space inside the cap airtight include isobutylene rubber, butadiene rubber, styrene-butadiene rubber, nitrile rubber, chloroprene rubber, butyl rubber, ethylene propylene rubber, and chlorosulfonated rubber, in addition to butyl rubber. Polyethylene, chlorinated polyethylene, acrylic rubber, silicone rubber, acrylonitrile butadiene rubber, urethane rubber, fluororubber, epichlorohydrin rubber, polysulfide rubber, olefinic thermoplastic elastomer, styrene thermoplastic elastomer rubber and elastomers, etc. can be selected as long as it has excellent chemical resistance to ink and gas permeation resistance that affects airtightness, but butyl rubber is excellent in both chemical resistance and gas permeation resistance. Good sealing can be achieved. In particular, since halogenated butyl rubber has a small compression set, it easily returns to its original shape when it is at rest after elastic deformation during sliding, and good sealing and sliding can be performed.

Also, by arranging the annular elastic body 12 at a position close to the lid 9, the storage space for the pen tip 3 is made small, and the drying of the pen tip in the storage space is suppressed as much as possible. In particular, in the case of a thin nib 3, the size of the storage space for the nib 3 greatly affects the drying of the nib in the storage space, so the drying of the nib can be suppressed more effectively.

Friction during sliding contact can be suppressed by applying a non-volatile liquid material to the sliding contact portions of each member. The non-volatile liquid substance may have a freezing point of −22° C. or lower, a boiling point of 145° C. or higher, and a viscosity of 10 mPa s or more and 500,000 mPa s (20° C.) or less. Synthetic lubricating oil, mineral oil Soybean oil, rapeseed oil, corn oil, safflower oil, rice oil, cottonseed oil, sesame oil, peanut oil, olive oil, palm oil, etc. Synthetic lubricating oils include hydrocarbon-based synthetic lubricating oils such as α-olefin (poly-α-olefin), polybutene (polyisobutylene), alkylbenzene, diester (dibasic acid ester), polyol ester Fatty acid ester synthetic lubricants such as (hindered ester), silicone oils, silicate esters, silicone synthetic lubricants such as silane, fluorocarbon synthetic lubricants such as chlorofluorocarbons, perfluoropolyethers, fluoroesters, etc., phenyl ether , phosphate esters, and the like. These can be used singly or in combination. Moreover, what gelatinized these may be used.

In particular, when synthetic resin, rubber, elastomer, etc. are used for the members that make up the sliding contact part, they are chemically stable against solvents such as ink, and have releasability and non-adhesive properties. , Straight silicone oils such as polydimethylsiloxane, polymethylhydrogensiloxane, polymethylphenylsiloxane, and cyclic dimethylsiloxane, which have low surface tension and tend to spread on the surface of substances, and side chains and/or both ends modified with organic groups. Amino-modified, epoxy-modified, carbinol-modified, mercapto-modified, carboxyl-modified, methacrylic-modified, polyether-modified, phenol-modified, silanol-modified, aralkyl-modified, fluoroalkyl-modified, long-chain alkyl-modified higher fatty acid ester-modified, containing higher fatty acid Modified silicone oil such as is preferably used. Straight silicone oils, such as polydimethylsiloxane, polymethylhydrogensiloxane, polymethylphenylsiloxane, and cyclic dimethylsiloxane, are less susceptible to environmental changes and the like because their viscosities change less with temperature.

In addition to this part, these hardly volatile liquid substances can be placed on members to be liquid-tight or to reduce sliding resistance.

In this embodiment, polydimethylsiloxane having a freezing point of −50° C. or lower, a boiling point of 200° C., and a viscosity of 10,000 mPa·s (20° C.) is applied to the sliding contact portion of each member. It is interposed in such a way as to achieve airtightness and a low coefficient of sliding friction.

The clip 4 shown in FIG. 20, which is a perspective view of the clip 4, and FIG. A base end portion 4a of the clip 4 is formed with a coil spring holding protrusion 4c extending toward the outer body side and is inserted into the coil spring 6. As shown in FIG. The coil spring holding projection 4c has projections 4i on both side surfaces and a coil spring press-fit portion 4j at its base. The coil spring press-fit portion 4j has an outer diameter slightly larger than the inner diameter of the coil spring 6, and when the coil spring holding protrusion 4c is inserted into the coil spring 6, the coil spring 6 is held in a press-fit relationship. can do. In addition, the presence of the projection 4i can prevent the coil spring 6 from being laterally shaken after being press-fitted. Furthermore, the coil spring holding projection 4c is provided with a slit 4h in the longitudinal direction of the exterior body 1. As shown in FIG.

A through hole 4g is provided in the base end portion 4a, and the clip 4 is attached to the base portion 5 by inserting the protrusion 5e of the base portion 5, and the clip 4 receives an upward biasing force from the coil spring 6, and the clip 4 is attached to the protrusion. The anti-base end portion 4b is urged toward the exterior body 1 side with the through hole 4g into which the 5e is inserted as a rotation axis. Here, due to the presence of the slit 4h, when the clip 4 is attached to the base 5, the protrusion 5e is inserted into the through hole 4g, so that the base end 4a of the clip 4 tends to spread temporarily in the lateral direction. Attachment of the clip 4 to the base 5 is facilitated.

A first inclined wall 4d that guides the convex portion 7a of the rotor 7 in the radial direction of the exterior body 1 protrudes from the anti-base end portion 4b of the clip 4. As shown in FIG. A second inclined wall 1o is positioned in front of the first inclined wall 4d. In addition, at a position in front of the pen tip projection locking portion 1p, behind the second inclined wall 1o and in front of the first inclined wall 4d, from the pen tip projection locking portion 1p side, A forwardly inclined third inclined wall 4e protrudes. The third inclined wall 4e abuts against the front side surface of the convex portion 7a of the rotor 7, so that the convex portion 7a is guided in the circumferential direction opposite to the guide in the circumferential direction by the second inclined wall 1o. Since it guides, the circumferential width of the guide path 1v formed in the exterior body 1 can be narrowed, and the exterior body 1 can be made slim. Furthermore, since the third inclined wall 4e is provided behind the second inclined wall 1o, the protruded portion 7a of the rotor 7 is guided from the pen tip retraction locking portion 1u to the pen tip protrusion locking portion 1p. Since the protruding portion 7a can be guided from the pen tip projecting locking portion 1p to the pen tip recessing locking portion 1u without guiding the convex portion 7a forward, the retracting operation of the pen tip 3 is facilitated. .

A regulation wall 4f is provided in the middle of the third inclined wall 4e. When the convex portion 7a is guided in the circumferential direction by the third inclined wall 4e by the restriction wall 4f, and the writing instrument body 2 is moved backward by the rear biasing force of the coil spring 11 after the forward operation of the writing instrument body 2 is released. In addition, the convex portion 7a does not move toward the pen tip projecting locking portion 1p and is reliably guided to the fourth inclined wall 1q.

Furthermore, the height of the restriction wall 4f is set so that it contacts the top of the projection 7a and lifts the clip slightly. When the protrusion 7a passes through the regulation wall 4f, the slightly lifted clip returns to its original position and makes an impact sound, which is used as a signal to release the knock.

22, which is a perspective view of the base 5; FIG. 23, which is a side view of the base 5; FIG. 24, which is a vertical cross-sectional view of the base 5; Front and rear engaging projections (front engaging projection 5a, rear engaging projection 5b) are formed. A claw portion 5d directed in the circumferential direction is formed on the rear engaging projection 5b, and a claw portion 5c directed forward is formed on the front engaging projection 5a.

A protrusion 5f projecting downward is formed in front of the center of the lower surface of the base 5 so as to enter the narrow portion 1m of the window hole 1k of the exterior body 1. The width of the window hole 1k of the exterior body 1 It surrounds both side edges of the narrow portion 1m and serves as a pen tip retraction locking portion 1u.

Further, a contact surface 5g is formed in the lower surface of the base portion 5, and the bridging portion 1A of the base portion attachment portion 1w of the exterior body 1 is brought into contact with the base portion 5 and the exterior body 1 so that the attachment of the base portion 5 and the exterior body 1 is completed. An inclined stepped portion 5h and an inclined stepped portion 5i are formed behind the projection 5f and the rear engaging projection 5b, respectively. With the inclined stepped portion 5h and the inclined stepped portion 5i, when the base portion 5 is attached to the exterior body 1, the claw portion 5c of the front engaging projection 5a can be inserted into the front engaging hole 1C without being caught. , making it easy to set up.

As shown in FIG. 26, which is a perspective view of the rotor 7, and FIG. 7b from which narrow extensions 7c are formed from both ends thereof. This is because when the rotor 7 is assembled in the recessed portion 2m of the writing instrument body 2 in the front-rear reverse direction, the short extension portion 7c of the rotor 7 becomes the short C-shaped portion 2n of the recessed portion 2m of the writing instrument body 2 and the leg. By interfering with the long C-shaped portion 2o, it plays a role of preventing erroneous assembly.

On the outer surface of the rotor 7, convex portions 7a are inserted into the window holes 1k of the exterior body 1 and guided by the inclined walls. protruding outside the

The cross section of the projection 7a is a rectangle that extends forward and backward, and has 45° tapered surfaces at both front corners and a rear inclined surface 7d at the rear. It is sufficient that the pen tip can be passed through the guide path formed in the window hole 1k of the exterior body 1, and can be retained by the pen tip protrusion locking portion 1p to maintain the pen tip protruding state.

Next, referring to FIG. 28, which is an exploded perspective view of each part of the writing instrument, a method of assembling each part to the exterior body 1 will be described.

First, the annular elastic body 10 is inserted into the exterior body 1 from the rear end opening 1b of the exterior body 1, and is press-fitted and fixed to the fixing portion 1G formed behind the tip opening 1a of the exterior body 1. As shown in FIG. Subsequently, the lid body 9, the annular member 13, the annular elastic body 12 and the coil spring 11 are sequentially inserted from the rear end opening 1b of the exterior body 1. As shown in FIG.

Next, the pen tip 3, the pen tip holder 15, the ink occluding body 14 filled with ink, and the operating member 8 were assembled to the writing instrument main body 2, and the rotor 7 was set in the concave portion 2m formed in the rear outer portion of the writing instrument main body 2. The writing instrument main body 2 is inserted from the rear end opening 1b of the exterior body 1, and the projection 2l of the writing instrument body 2 climbs over the projection 1r of the exterior body 1 and is temporarily engaged, thereby being biased backward by the coil spring 11. The writing instrument main body 2 can be accommodated in the exterior body 1 .

In this state, a closed space is formed in which the space in which the pen tip 3 exists is isolated from the outside air.

Finally, the clip 4 is pressed from above onto the base mounting portion 1w of the exterior body 1 via the coil spring 6 and the base portion 5 and fitted. The state at this time will be described with reference to FIG. . 29 and 30, (1) shows the base portion 5 before being assembled to the exterior body 1, (2) shows the state during assembly, and (3) shows the state where the assembly is completed. is shown.

When the base 5 is moved downward from the state (1) of FIGS. The rear engaging projections 5b enter the front engaging hole 1C and the rear engaging hole 1D of the exterior body 1, respectively. Since the inclined stepped portion 5h and the inclined stepped portion 5i are formed on the projecting portion 5f and the rear engaging projection 5b, the claw portion 5c formed on the front engaging projection 5a can be inserted without being caught in the front engaging hole 1C. be able to.

When pushed to (2) in FIGS. 29 and 30, the base portion 5 moves forward and enters due to the inclined stepped portion 5h and the inclined stepped portion 5i. At this time, the front engaging projection 5a is pushed rearward by the claw portion 5c and enters while being deformed. can do.

Further, as shown in FIG. 31, which is a front view of the exterior body 1 with the base portion 5 disposed thereon and viewed from the rear, the base portion 5 disposed on the exterior body 1 serves as a bridging portion between the contact surface 5g and the clip mounting portion 1w. 1A is in contact with the base 5 and the engaging portion 1B of the clip mounting portion 1w in a state where the front engaging projection 5a and the rear engaging projection 5b are engaged with each other, and the engagement portion 1B of the base portion 5 and the clip mounting portion 1w is fixed to the exterior body 1 by the engagement of 1C and 1D. A slight gap F is provided between them. By providing the gap F in this way, when the base portion 5 is attached to the exterior body 1, it can be used as a downward deflection allowance for both side surfaces of the base portion 5, and the base portion 5 can be more securely attached to the clip attachment portion 1w. can be done.

32 and 33, as the writing instrument main body 2 advances, the lid body 9 rotates and moves upward, opening the tip opening 1a of the exterior body 1, and the pen tip 3 and the writing instrument main body 2 move toward the tip opening. It shows how it protrudes from 1a. For the convenience of explanation, FIG. 32 is a vertical cross-sectional front view, and the pen tip 3 is not shown, and FIG. Note that stages (1) to (6) in FIGS. 32 and 33 indicate the same instant.

34 to 39 are front enlarged front views of stages (1) to (6) in FIG. 32, respectively, and show in detail how the rotating shaft 9c of the lid body 9 rotates and moves upward. ing.

Further, the bearing portion 1c of the exterior body 1, which is hidden behind the lid body 9 and cannot be seen originally, is indicated by a broken line for convenience of explanation.

As the writing instrument main body 2 advances, the concave curved surface 2g of the writing instrument main body 2 and the inner cam portion 9j of the cover 9 come into contact with each other, and the cover 9 tries to move upward along the long concave shape above the bearing 1c. At this time, the closing cam projection 9d of the rotating shaft 9c is housed in the closing recess 1f of the bearing portion 1c (step (1) and FIG. 34). Therefore, when the rotating shaft 9c receives an upward force, the closing cam projection 9d presses the inclined surface 1j extending from the closing recess 1f and the central projection 1g. However, the closing cam projection 9d cannot move upward due to the closing recess 1f or the central projection 1g, and rotates around the contact portion between the closing cam projection 9d and the inclined surface 1j. As a result, since the closing cam projection 8d has a curved surface, the contact portion with the inclined surface 1j moves so as to climb the closed central projection 1g and the inclined surface 1j (step (2) and FIG. 35).

When the writing instrument main body 2 advances to the stage (3) and the state of FIG. 36, the contact between the closing cam projection 9d of the rotary shaft 9c and the inclined surface 1j is released. Then, the R-curved apex of the central projection 1g formed on the bearing 1c contacts the concave cam 9g of the rotary shaft 9c, whereby the lid 8 rotates while moving upward.

Further, when the writing instrument main body 2 advances to the stage (4) and the state of FIG. 37, the rotary shaft 9c rotates and moves upward so that the open cam projection 9f of the rotary shaft 9c enters the open recess 1e of the bearing portion 1c.

In the state of stage (5) and FIG. 38, the open cam projection 9f of the rotary shaft 9c is in a state immediately before entering the open recess 1e of the bearing portion 1c, and the outer cam portion 9e of the lid body 9 contacts the contact surface 13c of the annular member 13. , slides on the contact surface 13c, and comes into contact with the projection 13d so as to push up the annular member 13. As shown in FIG.

By further advancing the writing instrument body 2 at a position where the inner cam portion 9j of the lid body 9 and the concave curved surface 2g of the writing instrument body 2 do not come into contact with each other, the pen tip 3 and the tip of the writing instrument body 2 are protruded from the tip opening 1a of the exterior body 1. (Step (6) and Figure 39).

When the outer cam portion 9e of the lid 9 comes into contact with 13d so as to push up the annular member 13, the lid 9 can be rotated in the closing direction while the writing instrument main body 2 is retreating.

In this embodiment, two projections are formed on the rotating shaft 9c and two recesses are formed in the bearing portion of the exterior body, but two or more projections and recesses may be formed. By increasing the number of protrusions and recesses, the contact between the protrusions and recesses changes one after another, and the rotation and linear movement can be performed more smoothly. This is what is called a "rack and pinion" in terms of so-called gears.

In this embodiment, two cams are provided on the rotating shaft 8c of the lid body 8, and the respective cams are accommodated in the recesses of the bearing portion 1c of the exterior body 1 in the closing and opening states. At the start, the linear force applied to the lid body 8 can be more reliably converted into a rotational and vertical movement force, and the lid body 8 can be reliably rotated and moved.

By causing the rotary shaft to roll against the bearing portion in this manner, the frictional resistance between the rotary shaft and the bearing portion is eliminated, and the rotation and movement of the lid body 8 can be facilitated. Furthermore, since there is no wear on the bearing portion of the rotating shaft due to repeated opening and closing of the lid 8, damage to the rotating shaft can be prevented, and durability can be improved. In addition, it is possible to prevent malfunctions due to the diameter of the rotating shaft becoming smaller due to wear and rattling of the bearing portion, thereby improving the durability.

Next, as shown in FIG. 40, which is a front view of only the anti-base end portion of the clip 4 at the rear operation portion of the writing instrument 2, as shown in FIGS. 48, the protruding portion 13a of the rotor 13 moves from the recessed position where the pen tip 3 is recessed to the protruding position where the pen tip 3 protrudes from the front end opening 1a of the exterior body 1; The operation of moving along a series of guide paths from the protruded state to the retracted state will be described.

When the operation member 8 connected to the rear end portion of the writing instrument body 2 and protruding from the rear end opening 1b of the exterior body 1 is pressed, the writing instrument body 2 moves forward against the rearward biasing force. The protruding portion 7a of the rotor 7 at the retracted position within the window 1k advances within the window 1k as the writing instrument main body 2 advances and the rotor 7 advances (FIG. 41). The convex portion 7a comes into contact with the first inclined wall 4d protruding from the back surface of the anti-base end portion 4b of the clip 4b located in front (FIG. 42), and pushes the anti-base end portion of the clip 4 radially outward while moving forward. do.

The convex portion 7a passes through the third inclined wall 4e along the top surface of the third inclined wall 4e and moves further forward (FIG. 43). Then, the protruding portion 7a that has moved forward contacts the second inclined wall 1o formed at the front end portion of the window hole 1k of the exterior body 1. As shown in FIG. Further, when the writing instrument main body 2 moves forward, it moves along the second inclined wall 1o, is guided in front of the pen tip projecting locking portion 1p, comes into contact with the side wall of the wide portion 1n of the exterior body 1, and contacts the convex portion 7a. By restricting the forward movement, the forward movement of the writing instrument body 2 is completed (Fig. 44). The completion position of the forward movement due to the contact with the side wall of the wide portion 1n of the exterior body 1 is the most forward position of the path from the pen tip retraction locking portion to the pen tip protrusion locking portion in the present embodiment. Become.

Here, when the pressure on the operating member 8 is released, the writing instrument main body 2 urged rearward retreats along the axis of the writing instrument main body 2 . At this time, the rotor 7 is also retracted together with the writing instrument main body 2, and is locked by the pen tip projection locking portion 1p, so that the pen tip 3 projects from the tip opening 1a of the exterior body 1 and rotates. The movement from the retracted position to the projecting position of the projection 13a of the child 13 is completed (FIG. 45).

Since the pen tip 3 is retracted from the protruded state from the front end opening 1a of the exterior body 1, when the operation member 8 protruding from the rear end opening 1b of the exterior body 1 is pressed, the writing instrument main body 2 moves forward. The rotor 7 and the projections 7a of the rotor 7 also move forward.

A third inclined wall 4e formed on the rear surface of the anti-basal end portion 4b of the clip 4 is positioned in front of the convex portion 7a, and the convex portion 7a abuts against the third inclined wall 4e (FIG. 46). When the convex portion 7a further advances, the convex portion 13a moves in the circumferential direction along the third inclined wall 4e and comes into contact with the side wall of the first inclined wall 4d. By being restricted, the forward movement of the writing instrument main body 2 is completed (FIG. 47). The position where the forward movement is completed by contact with the side wall of the first inclined wall 4d is the most forward position where the projection in this embodiment travels from the pen tip projecting engagement portion to the pen tip retraction engagement portion.
In the present embodiment, the side wall of the first inclined wall 4d is used as a circumferential movement restricting portion of the circumferential guiding inclined wall (third inclined wall 4e) that guides the side wall in the circumferential direction (that is, the first inclined wall 4d ( The side wall of the radial guiding inclined wall) regulates the amount of movement in the circumferential direction of the convex portion 7a guided by the circumferential guiding inclined wall (third inclined wall 4e), and the convex portion is radially moved. Since the radial guiding inclined wall (first inclined wall 4d) that guides also serves as a circumferential movement restricting portion of the convex portion, the guide path as the moving locus of the convex portion is a route that avoids the engaging portion. To provide a retractable writing instrument having a high degree of freedom in appearance design by eliminating the need to form a guide path and narrowing the width of a guide path in the circumferential direction to that extent so that the shaft of the retractable writing instrument can be made thinner. is possible. Furthermore, in this process, when the top of the projection 7a comes into contact with and passes through the regulation wall 4f formed in the middle of the third inclined wall 4e, the slightly lifted clip returns to its original position and generates an impact sound.

When the pressure on the operating member 8 is released, the writing instrument body 2 urged rearward retreats along the axis of the writing instrument body 2 . At this time, the rotor 7 also retreats together with the writing instrument main body 2, and the protrusion 7a retreats along the first inclined wall 4d and the regulation wall 4f, and hits the fourth inclined wall 1q formed in the exterior body. (Fig. 48). Then, the projection 7a returns to the retracted position along the fourth inclined wall 1q.

In this embodiment, the convex portion is located closer to the side wall of the wide portion 1n of the exterior body 1 than the convex portion forms the most advanced position of the path from the pen tip retraction locking portion to the pen tip protrusion locking portion. Since the contact portion with the side wall of the first inclined wall 4d that forms the most advanced position of the path from the pen tip protruding locking portion to the pen tip retracting locking portion is arranged at the rear, the convex portion The lock can be released with a shorter operation stroke when moving from the pen tip projection locking portion to the pen tip retraction locking portion than when moving from the pen tip retraction locking portion to the pen tip projection locking portion. Therefore, the pen tip can be easily retracted, and malfunction such as failing to store the pen tip in the exterior body is less likely to occur.

In the present embodiment, the first inclined wall 4d and the third inclined wall 4e are formed on the anti-basal end portion 4b of the clip 4, but are provided on the window hole 1k of the exterior body 1 instead of on the clip 4, and the rotor 7 It can also be formed so that it can move up and down by advancing the convex portion 7a. By arranging the clip 4 so as to cover the window hole 1k of the exterior body 1, the window hole 1k can be hidden from the appearance, and the appearance is improved.

In addition, in the present invention, the pen tip projecting engaging portion 1p is provided between the narrow portion 1m and the wide portion 1n of the window hole 1k of the exterior body 1. It is also possible to form an inclined surface toward the side edge of the narrow width portion, and to form the pen tip protruding engagement portion 1p from the back surface of the anti-base end portion 4b of the clip.

In this case, when the clip 4 is lifted in the protruding state of the pen tip, the protruding portion 7a of the rotor 7 that is engaged with the pen tip protruding engagement portion 1p formed on the back surface of the anti-base end portion 14b of the clip is released. It is possible to return to the retracted position by being guided by the slanted surface, and it can be configured as a so-called safety mechanism.

1 Exterior Body 1a Tip Opening 1b Body Rear End Opening 1c Bearing 1d Receiving Surface 1e Opening Recess 1f Closing Recess 1g Central Projection 1h Opening Stopper Abutment Wall 1i Closure Stopper Abutment Wall 1j Inclined Surface 1k Window Hole 1m Narrow width Portion 1n Wide portion 1o Second inclined wall 1p Pen tip protrusion locking portion 1q Fourth inclined wall 1r Protrusion 1s Stepped portion 1t Inclined surface 1u Pen tip retraction locking portion 1v Guide path 1w Base mounting portion 1A Bridge portion 1B Engagement portion 1C Front engagement hole 1D Rear engagement hole 1E Blindfold wall 1F Protection wall 1G Fixing portion 2 Writing instrument main body 2a Small diameter portion 2b Large diameter portion 2c Shoulder 2d Holding rib 2e Pen tip holding projection 2f Rib 2g Concave curved surface 2h Chamfered portion 2k Air groove 2l Projection 2m Recess 2n C-shaped portion with short legs 2o C-shaped portion with long legs 2r Shaking prevention rib 2s Female threaded portion 2t Convex portion 3 Pen tip 3a Writing portion 3b Connecting portion 3c Stepped portion 3d Tapered portion 4 Clip 4a Base end 4b Opposite base end 4c Coil spring holding projection 4d First inclined wall 4e Third inclined wall 4f Regulating wall 4g Through hole 4h Slit 4i Projection 4j Coil spring press-fit part 5 Base 5a Front engagement Coupling projection 5b Rear engaging projection 5c Claw portion 5d Claw portion 5e Protrusion 5f Protrusion 5g Contact surface 5h Inclined stepped portion 5i Inclined stepped portion 6 Coil spring 7 Rotor 7a Projection 7b C-shaped portion 7c Narrow extension 7d rear inclined surface 7e front end side surface 8 operation member 8a knock portion 8b insertion portion 8c male screw portion 8d abutment portion 8e rib 8f tapered portion 8g receiving rib 8h concave portion 8i stepped portion 9 lid body 9a lid portion 9b side wall portion 9c rotating shaft 9d Closing cam projection 9e Outer cam portion 9f Opening cam projection 9g Recessed cam portion 9h Opening stopper 9i Closing stopper 9j Inner cam portion 9k Cam surface 9l Notch portion 9m Head 9n Recess 10 Annular elastic body 11 Coil spring 12 Annular elastic body 12a Outside Sealing rib 12b Outer inclination prevention rib 12c Inner sealing rib 12d Stepped portion 12e Receiving groove 13 Annular member 13a Connecting portion 13b Side wall portion 13c Contact surface 13d Projection 13e Middle hole portion 13f Stepped portion 14 Ink occluding body 15 Pen tip holder 15a Press-fit fixing portion 15b Step 15c Groove

Claims (2)

and a writing instrument main body that is housed in the exterior body so as to be movable back and forth and has a pen tip provided at the tip and a convex portion provided on the side, wherein the exterior body is a pen A tip projection locking portion and a pen tip recession locking portion have a guide path for guiding the projection, and the writing instrument main body is moved back and forth so that the projection engages the pen tip projection locking portion. Then, the protruding state in which the pen tip protrudes from the opening at the tip of the outer body, and the retracted state in which the pen tip is retracted into the outer body as the protrusion engages with the pen tip retraction locking portion. a circumferential direction guiding inclined wall provided so as to come into contact with the front side surface of the convex portion, which guides the convex portion in the circumferential direction of the exterior body, and which is configured to be switchable between and a radial guide inclined wall that guides in the radial direction of the guide path so as to be able to contact the convex portion moving in the guide path, and the side wall of the radial guide inclined wall is guided by the circumferential guide inclined wall. a retractable writing instrument as a movement restricting portion for restricting the amount of movement of the convex portion in the circumferential direction. The protruding portion of the guide path is closer to the pen tip projection locking portion than the wall portion forming the most advanced position in the path from the pen tip retraction locking portion to the pen tip projection locking portion. 2. The retractable writing instrument according to claim 1, wherein a wall portion forming a most advanced position provided so as to come into contact with the front side surface of said convex portion on the way from to said pen tip retraction locking portion is disposed rearward.

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