JP6915232B2 - Haunting writing tool - Google Patents

Description

In the present invention, a writing tool 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 tool body is interlocked with a lid arranged at the tip opening of the exterior body as the writing tool body is moved forward or backward by an operation. The present invention relates to a retractable writing instrument in which the tip opening of the exterior body is opened and closed, and the pen tip is retracted from the tip of the exterior body.

Conventionally, a writing tool 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 tool body is interlocked with a lid arranged at the tip opening of the exterior body as the writing tool body is moved forward or backward by an operation. A retractable writing tool that opens and closes the tip opening of the exterior body and allows the pen tip to appear and disappear from the tip of the exterior body does not separate the lid from the writing tool body. Although there is no need to worry about losing it, the pen tip can be stored and sealed with a single touch, which suppresses ink drying from the pen tip, provides a fresh brush stroke for a long period of time, and unexpectedly causes the pen tip to change when not in use. It suppresses contact with objects.

Such a haunting type writing tool has a structure in which a protrusion provided on the outer surface of the lid is rotatably housed in the exterior body to open and close the lid, and the lid is rotated around the protrusion.
Hereinafter, the pen tip direction of the writing instrument will be described as the front direction, and the opposite direction will be described as the rear direction.
For example, what is disclosed in Japanese Patent Application Laid-Open No. 2009-535233 is that the lid body housed in the exterior body is provided with a cam and a rotation shaft, so that when the lid body rotates, the center of the rotation shaft is in the rear direction. It is configured to move to.

Special Table 2009-535233 Gazette

In Patent Document 1, the lid body is provided with a cam and a rotation shaft so that when the lid body rotates, the lid body is moved in the rearward direction. With such a configuration, the lid rotates while being separated from the inner edge of the tip opening of the exterior body in which the lid is in close contact, so that the sliding resistance between the lid and the inner edge of the opening is reduced, and the lid and the lid are configured. Wear of the inner edge of the opening is suppressed, and the airtightness can be maintained.
However, in Patent Document 1, when the lid is opened, the lid is moved backward against the forward urging force applied by the operation, so that the knock load is increased accordingly. There was a problem.

The outer package, and the dynamic possible writing instrument body back and forth with a pen tip to tip, accommodating a lid, the writing instrument body, a lid disposed in front end opening of the outer package due to be advanced or retracted by the operation by linking, by opening and closing the front end opening of the outer package, the slide type writing tool comprising by haunt the pen tip from the tip of the outer body, said lid body is in close contact with the inner edge of the outer member front end opening at closed have a rotating shaft in the side wall portion with those who are having a bearing portion for the rotational shaft in the interior of the exterior body, the bearing portion thereof opposite to the direction in which the rotation axis is vertically spaced from the axis of the outer member It has an elongated concave portion having a distance to move to, and moves in a direction vertically separated from the axis of the exterior body along the elongated concave portion of the bearing portion while the lid body rotates as the writing tool body advances. The gist is that it is a haunting type writing tool that is characterized by this.

In the present invention, since the opening operation of the lid is rotated and moved in a direction vertically separated from the axis of the exterior body, the lid can be opened without resisting the forward urging force due to the knock operation as much as possible. It can suppress the knock load.

Longitudinal sectional view showing the first embodiment Enlarged view of the tip of FIG. Enlarged view of the tip of FIG. 1 showing the bearing and leaf spring. Perspective view showing parts of the lid Perspective view of the lid from the opposite side of FIG. Front view of the lid Cross-sectional perspective view showing parts of the exterior body Perspective view showing the parts of the leaf spring FIG. 2 equivalent diagram showing the open state of the lid FIG. 3 equivalent diagram showing the open state of the lid FIG. 2 equivalent diagram showing the closure process of the lid FIG. 3 equivalent diagram showing the closure process of the lid Perspective view showing the lid body of Example 2. Side view showing parts of the lid Perspective view showing a part of an annular member Cross-sectional perspective view showing an annular elastic part Perspective view of the tip cross section showing the parts of the exterior body Front view of the tip cross section showing the parts of the exterior body Perspective view of the tip cross section showing the parts of the writing tool body Front view of the tip cross section showing the parts of the exterior body FIG. 2 equivalent diagram illustrating the rotation of the lid and the forward movement of the writing instrument body FIG. 2 equivalent diagram illustrating the rotation of the lid and the forward movement of the writing instrument body Enlarged view showing step 1 of FIG. Enlarged view showing step 3 of FIG. Enlarged view showing step 6 of FIG. FIG. 2 equivalent diagram illustrating the rotation of the lid and the retracting operation of the writing instrument body FIG. 2 equivalent diagram illustrating the rotation of the lid and the retracting operation of the writing instrument body Perspective view showing the parts of the lid body of Example 3. Side view showing parts of the lid Perspective view of the tip cross section showing the parts of the exterior body Front view of the tip cross section showing the parts of the exterior body FIG. 2 equivalent diagram showing step 1 for explaining the rotation of the lid and the forward movement of the writing instrument body. FIG. 2 equivalent diagram showing step 2 for explaining the rotation of the lid and the forward movement of the writing instrument body. FIG. 2 equivalent diagram showing step 3 for explaining the rotation of the lid and the forward movement of the writing instrument body. FIG. 2 equivalent diagram showing step 4 for explaining the rotation of the lid and the forward movement of the writing instrument body. FIG. 2 equivalent diagram showing step 5 for explaining the rotation of the lid and the forward movement of the writing instrument body. FIG. 2 equivalent diagram showing step 6 for explaining the rotation of the lid and the forward movement of the writing instrument body.

The writing tool body is a member having a pen tip at the tip and accommodating ink inside. As the pen tip, a ballpoint pen tip, a fiber converging body, a porous body pen tip such as urethane, a synthetic resin pen tip having a communication hole, or the like can be appropriately used.
Further, as a method of accommodating the ink in the writing tool main body, an ink occlusion body such as a fiber converging body may be impregnated, or the ink accumulator may be directly stored in the main body in a free state without using the ink occlusion body. As the ink to be used, a dye and / or a pigment can be used as the colorant, and water and / or an organic solvent can be appropriately used as the solvent.

For the operation of moving the writing instrument body forward and projecting the pen tip from the tip of the exterior body, a known method such as providing a knock member arranged at the rear end of the retractable writing instrument or providing a slide mechanism on the side portion can be appropriately adopted. Further, a repellent member such as a coil spring can be arranged between the members to help drive by operation and seal the lid member.

As a method of locking the writing tool main body with the pen tip protruding, a cam member having a rotor is provided behind the writing tool main body, and a so-called debit cam that locks by rotation of the cam member, or a cam portion is attached to a clip. A so-called heart cam that is provided and locked by rubbing against the writing tool main body, a structure that provides a protrusion on the writing tool main body and locks by rotating the writing tool main body itself at the locking portion of the exterior body, etc. You can choose.

The lid that closes the front end opening of the exterior while the writing tool body is housed inside the exterior body when not in use is a lid that is operated by moving the writing tool body forward and projecting the pen tip from the tip of the exterior body. The front end opening of the exterior body is opened by the rotation of the body. If the lid is sealed so that it is pressed against the inner edge of the front end opening of the exterior body, the lid is suddenly closed even when the internal pressure inside the sealed chamber inside the lid increases due to an increase in environmental temperature or the like. It is possible to prevent the member from opening. Further, by making the radius of gyration of the lid as small as possible, the writing tool itself can be made slender. When the ink used uses an organic solvent as the main solvent, it is preferable that the space where the pen tip exists is small when the lid is closed. By making the turning radius of the lid as small as possible, the pen tip in the closed space Drying is also suppressed. At this time, 500 mm ³ or less is desirable as a good closed space that can suppress the drying of the pen tip. Even in the case of ink using water as the main solvent, it is preferable that the closed space is small. In the present invention, the main solvent is the solvent having the highest ratio with respect to the total amount of the solvent in the total amount of the ink composition.
Further, as the material of the lid, it is preferable to use polypropylene or polybutylene terephthalate having low gas permeation in order to suppress the drying of the pen tip in the closed space in the closed state. Generally, it is often stored with the pen tip facing down, and the vapor of the organic solvent evaporated from the pen tip is heavier than air and collects from the lower side in the enclosed space, so gas permeation from the pen tip is permeated from the pen tip. It has a great effect on drying. Therefore, it is preferable to use polypropylene, polybutylene terephthalate, or the like having low gas permeability because the drying of the pen tip can be suppressed. Examples of the material having low gas permeability include polypropylene, polybutylene terephthalate, polyethylene, polyethylene terephthalate, and the like, which can be appropriately selected and used.
Further, since the lid body slides with the writing tool main body according to the appearance of the pen tip, it is preferable to use polyacetal in order to improve the sliding of the lid body and improve the durability.
In other words, polypropylene, polybutylene terephthalate, etc. when using an ink whose main solvent is an organic solvent that tends to dry the pen tip, and polyacetal when using an ink whose main solvent is water, which does not easily dry the pen tip. It is preferable to use it.
In the present invention, since the lid is a haunting type writing tool characterized in that the opening operation of the lid is moved in a direction vertically separated from the axis of the exterior body while rotating, the writing tool main body is advanced to advance the exterior. By the operation of projecting the pen tip from the tip of the body, the lid is rotated so as to be separated from the inner edge of the front end opening of the exterior body which is in close contact. Therefore, the sliding resistance between the lid and the inner edge of the front end opening of the exterior body is reduced, the wear of the inner edge of the lid and the front end opening of the exterior body is suppressed, and the airtightness can be maintained.
The structure is such that the writing instrument body is moved forward and the pen tip is projected from the tip of the exterior body to move the lid body, and the lid body is in contact with and sealed so as to be pressed against the inner edge of the front end opening of the exterior body. Since the operating range of the lid is provided in the closed space that seals the pen tip when the lid is closed, a space for moving the lid is required, and as a result, the closed space becomes large.

The repellent member can also be used to urge the lid body in a direction that closes the front end opening of the exterior body. As the repellent member, a leaf spring, a coil spring, a coil spring, an elastic structure, or the like can be appropriately used by devising an installation location where each function functions.
Since a force to retract the writing instrument body is required to close the lid body by the retracting force of the writing instrument body, a repellent member is arranged between the writing instrument body and the lid body directly or by interposing a member. It is also possible to support the movement of the writing tool body in the rear direction when the pen tip is stored and the pressing of the lid body against the front end opening of the exterior body.

The means of contacting the lid and transmitting the forward movement of the writing tool body to rotate the lid and move it in a direction vertically separated from the axis of the exterior body is to bring the writing tool body into contact with the lid and move the writing tool body forward. A so-called cam mechanism that converts the force of The configuration described in is used. The writing tool body of the present invention can approximate the force in the normal direction to the tangent line of the rotation trajectory of the contact, and the load required to rotate the lid and move it in a direction vertically separated from the axis of the exterior body. Can be adjusted to a low load.
Further, by providing the position of the protrusion of the lid body in a state where the lid body closes the front end opening of the exterior body at a position as far as possible from the front end opening, the protrusion of the lid body and the writing tool main body can be separated from each other. The distance between the contact point and the opening of the exterior body can be increased, and a relatively long pen tip can be provided.
Further, by providing the position of the protrusion of the lid body as far as possible from the center of rotation, the radius of gyration can be kept long, so that a large load can not be required to rotate the lid body. However, if the radius of gyration is increased, a large internal space is required for the exterior body in which the lid body is housed, so that the exterior body becomes thicker, which may make it difficult for the user to use. Therefore, the distance between the center of rotation and the protrusion is preferably 15 mm or less.
In addition, the larger the size of the protrusions on the lid, the greater the durability of repeated driving, but the radius of gyration may change slightly, so while maintaining durability, the maximum diameter is 0.4 mm or more 5 It is preferably about 0.0 mm or less. As the ink to be used, a dye and / or a pigment can be used as a colorant, and water and / or an organic solvent can be appropriately used as a solvent.

The means for rotating and moving the rotating shaft is composed of one cam mechanism, but the lid is provided with a cam for rotating the rotating shaft and a cam for moving the rotating shaft in a direction vertically separated from the axis of the exterior body. May be configured.
The thickness of the rotating shaft can be set in a timely manner in consideration of strength and durability, but it can be rotated by setting the outer diameter of the rotating shaft according to the angle at which the lid rotates and the distance it moves. The shaft can be made to roll on the bearing portion of the exterior body. By operating the rotating shaft so as to roll with respect to the bearing portion in this way, the frictional resistance between the rotating shaft and the bearing portion can be extremely reduced, and the rotation and movement of the lid can be facilitated. Further, since the wear on the bearing portion of the rotating shaft due to the repeated opening and closing of the lid is extremely low, the damage to the rotating shaft can be significantly reduced, and the durability can be improved. In addition, the diameter of the rotating shaft becomes smaller due to wear, and it is possible to prevent malfunction due to rattling of the bearing portion.

As a locking mechanism for locking the lid in the open state, when the lid is opened, an undercut arranged on a part of the edge of the lid or a locking portion such as a protrusion is provided. It can be said that fitting over the unevenness by the protrusions (or steps associated with the recesses) is preferable in terms of reliable locking, but a sliding wall to which the lid body is pressure-welded may be formed.
Further, here, as a method of applying a force in the rotational direction to the lid, a linear repulsive force such as a coil spring is converted into a rotational force by a cam mechanism with the lid and / or its peripheral members. , The position to receive the force is located outside the rotation center of the lid, and this point is aligned with the rotation center of the lid with respect to the direction in which the force is applied by the repellent member. If it is in the position, no rotational force is applied to the lid. Therefore, by changing the position of the lid or the repellent member (including another intervening member) and moving to this position, a state in which no rotational force is applied to the lid is formed even if a force is applied. Can be done. However, at this time, if the inertial force due to the rotation of the lid is not stopped, the lid may rotate even if the rotational force is not applied, and the locking may not be stable. Therefore, the lid is used as a separate member. It is necessary to devise ways to stop the rotation of the lid, such as making it abut, or forming a contact wall between the lid and the repellent member (or intervening member) so that surface contact is achieved at the point where no force is applied. ..

The method of unlocking the lid can be performed by moving the lid and / or the member that locks the lid, in addition to the method of forcibly rotating the lid, but the lid is locked. The method of moving the member is preferable in terms of the certainty of sealing and releasing by the stable rotational movement of the lid, and the fact that a large force required at the time of releasing is not required. By adopting a method of changing the position where the rotational force is applied to the lid as the lid open state lock, the lock can be easily released by slightly losing the balance, so the force at the time of release is further suppressed. Things are possible.

(Example 1)
An example is shown in FIGS. 1 to 12.
It is assumed that the fiber converging body is used as a pen tip, and a low-viscosity ink containing water and / or an organic solvent as a solvent is impregnated into an ink occlusion body which is a fiber converging body.
A writing instrument main body 3 having a pen tip 2 at the tip is housed inside an exterior body 1 which is a member that forms the outermost shape of the writing instrument and is gripped by a hand. The exterior body 1 is basically a tubular body having through holes having openings at the front and rear ends, the front opening (front end opening 1a) is the pen tip protrusion, and the rear opening (rear opening). The rear end opening 1b) is a protruding port of the operating member. An annular elastic body 5 that is in sliding contact with the lid 4 described later is fitted and fixed to the inner edge of the front end opening 1a, and the lid 4 is in a state where the lid 4 closes the front end opening 1a. Is in circumferential contact with the annular elastic body 5 to block airflow in the portion.

As shown in FIG. 1, a clip 6 for the protrusion locking mechanism of the writing tool main body 3 is integrally fixed to the side portion of the exterior body 1, and a gear member is integrally fixed to the inside of the tip of the clip 6. 7 is rotatably fixed.
The front protrusion 3a and the rear protrusion 3b are formed on the same axis on the rear side surface of the writing tool main body 3, and project out of the exterior body 1 through the slit holes 1c provided on the side portion of the exterior body 1. At the position where the pen tip 2 protrudes by advancing the writing tool main body 3, the front protrusion 3a is locked to the gear member 7 arranged inside the tip of the clip 6 to maintain the pen tip protruding state. When the writing tool main body 3 is further advanced, the rear protrusion 3b rotates the gear member 7, the front protrusion 3a and the gear member 7 are released from the lock, and the writing tool main body 3 can be retracted. The writing tool main body 3 receives a rearward urging force by the coil spring 8 that abuts on the shoulder portion 3c, and when the front protrusion 3a and the gear member 7 are released from the lock, the pen tip 2 is attached to the exterior body 1 The writing tool main body 3 retracts to a position where it is immersed in the inside.
In this embodiment, polypropylene having low gas permeation and good moldability was used for the exterior body 1. The clip 6 is made of polycarbonate, which is hard and has a strong repulsive force when bent, making it a product with excellent durability. Since the gear member 7 is in sliding contact with the writing tool main body 3 and acts as a cam for unlocking the writing tool main body 3, polyacetal having self-lubricating property and excellent frictional wear property is used.

An ink occlusion body 9 impregnated with ink is housed inside the writing tool main body 3, and the rear end of the pen tip 2 is embedded in the tip of the ink occlusion body 9 so that the ink can communicate with each other. The writing tool main body 3 is made of polypropylene, which has low gas permeation and good moldability. Further, at the rear part of the writing tool main body 3, there is a tail plug 10 which is detachably attached by screwing and is airtightly attached, and the ink storage body 9 is interposed in the internal space of the tail plug 10. A plurality of ribs 10a extend in the longitudinal direction on the inner wall to form a ventilation path between the inner wall of the tail plug 10 and the writing tool main body 3 and the ink occlusion body 9 and at the rear end, and the ribs 10a form a ventilation path. The ink occlusion body 9 is sandwiched so that the ink occlusion body 9 is removed together with the tail plug 10 when the tail plug 10 is removed. As a result, when the amount of ink impregnated in the ink occlusion body is consumed and the amount of ink is reduced or the ink runs out, the ink occlusion body 9 is taken out together with the tail plug 10 and impregnated with ink again, or the ink is impregnated together with the ink occlusion body. It can be replaced with an impregnated ink occlusion body. In addition, the ink occlusion body 9 has an outer skin, so that even if it is touched at the time of replacement, the hands will not get dirty.

Further, the outer shape of the writing tool main body 3 is mainly composed of a small diameter portion 3d accommodating the pen tip 2 and a large diameter portion 3e mainly accommodating the ink occlusion body 9, and a shoulder portion 3c is formed between them. It is formed. As described above, the shoulder portion 3c is a portion where the writing tool main body 3 receives the urging force when the pen tip is immersed and moved by the coil spring 8. A plurality of ribs are formed between the shoulder portion 3c and the small diameter portion 3d to suppress the bending of the small diameter portion 3d. An annular elastic body 11 is fitted between the inner wall of the exterior body 1 and the small diameter portion 3d of the writing instrument main body 3 in an airtight state. As a result, the annular elastic body 5 fitted and fixed to the inner edge of the front end opening 1a of the exterior body 1 and the lid 4 are in an airtight contact, and the lid that houses the pen tip 2 in an airtight state is closed. Form the space where the pen tip exists.
Further, in the pen tip 2, the pen core 2a is caulked and held by the pen tip holder 2b, and the pen tip holder 2b is press-fitted into the tip inner hole of the small diameter portion 3d to fix the pen tip 2. .. An air groove 3i is formed inside the small diameter portion 3d of the writing tool main body 3 so that air can be exchanged.

As shown in FIG. 2, which is an enlarged view of the tip portion of FIG. 1, the lid 4 can rotate and move in the direction perpendicular to the axis of the exterior body and in the opposite direction in the vicinity of the front end opening 1a of the exterior body 1. It is attached to. In FIG. 3, the exterior body 1 and the annular elastic body 5 are cut in the vertical direction so that the operation of the rotating shaft 4c of the lid 4 can be understood, and the bearing portion 1d and the protruding portion 1o that receive the rotating shaft 4c are broken lines. Is shown.
As shown in FIGS. 4 and 5 which are perspective views showing the members and FIG. 6 which is a front view, the lid body 4 has a lid portion 4a and a side wall portion 4b which can close the front end opening 1a of the exterior body 1. However, the side wall portion 4b is provided with a columnar rotating shaft 4c that abuts from the rear on two bearing portions 1d formed so as to face the inner wall of the exterior body 1 in a convex state outward.
The tip surface of the rotating shaft 4c is inclined so as not to interfere with the exterior body 1 when the lid 4 rotates inside the exterior body 1 and moves in a direction vertically separated from the axis of the exterior body and in the opposite direction. It is formed by a curved surface with a certain surface.
The portion between the side wall portions 4b of the lid body 4 is a space portion, and when the lid body 4 rotates and moves to open the front end opening 1a of the exterior body 1, the pen tip 2 and the writing tool main body 3 are opened. It forms a passage through which it can pass.
Further, an inner cam portion 4d is formed as an inward protrusion on the inner side wall portion of the side wall portion 4b of the lid body 4. The inner cam portion 4d is a portion that comes into contact with the writing tool main body 3 by advancing the writing tool main body 3, and by the contact, the writing tool main body 3 pushes the lid body 4 and forcibly rotates the lid body 4, and the outer body 1 The front end opening 1a and the space portion of the lid 4 meet, and the pen tip 2 protrudes.
Since the lid body 4 has an inner cam portion 4d that slides in contact with the writing tool main body 3 and rotates the lid body 4, polyacetal having self-lubricating property and excellent frictional wear property is used.
In the present invention, since the lid is a haunting type writing tool characterized in that the opening operation of the lid is moved in a direction vertically separated from the axis of the exterior while rotating, the exterior is in close contact with the lid. Rotate away from the inner edge of the front end opening of the body. Therefore, the sliding resistance between the lid and the inner edge of the front end opening of the exterior body is reduced, the wear of the inner edge of the lid and the front end opening of the exterior body is suppressed, and the airtightness can be maintained.
Therefore, even a material having a slightly inferior wear resistance can be appropriately selected. As an example, polypropylene, polybutylene terephthalate, polyethylene, and polyethylene terephthalate, which are materials having low gas permeation, can be positively used.
Further, since the lid body 4 has a U-shape in shape, the side wall portion 4b of the lid body 4 tends to bend inward during injection molding of parts. In order to prevent this bending, the gate, which is the resin inflow port of the mold, is arranged so as to come to the outer central portion of the lid portion 4a. Further, a gate is arranged at the top of the lid portion 4a. In order to eliminate the influence of rubbing between the lid 4 and the front end opening 1a due to the remaining gate, the periphery of the remaining gate is provided as a recess. Further, when the diameter of the gate is relatively large and the thermoplastic resin can sufficiently retain the holding pressure after the flow in molding, the bending after molding is small, and therefore the gate diameter is 0.5 mm. It is better to make it 0.8 mm or less.
It is preferable that the material of at least one member of the front end opening of the lid body and the exterior body is an elastic material such as synthetic resin, rubber, or elastomer. Further, it is also possible to appropriately use another member made of an elastic material such as synthetic resin, rubber, or elastomer between the lid body and the front end opening of the exterior body. In particular, butyl rubber is preferable because it has excellent chemical resistance and gas resistance and thus maintains a good sealed state.

As shown in FIG. 7, which is a vertical cross-sectional perspective view of the tip of the exterior body 1, the direction in which the rotation axis 4c of the lid 4 rotates and is vertically separated from the axis of the exterior body and vice versa. It has a bearing portion 1d that can be movably attached in a direction. In order to restrict the movement of the rotating shaft 4c of the lid 4, the bearing portion 1d is provided with a wall in a direction vertically separated from the front and the axis of the exterior body and in the opposite direction. The distance between the direction vertically separated from the axis of the exterior body of the front wall (receiving surface 1e) and the wall provided in the opposite direction is the direction in which the rotating shaft 4c is vertically separated from the axis of the exterior body. And vice versa . Therefore, the bearing portion 1d has a concave shape that is long in the direction vertically separated from the axis of the exterior body and in the opposite direction. The rear part of the rotating shaft 4c is an open portion without a wall, but this is because when the lid body 4 is arranged on the exterior body 1, the lid body 4 facilitates the insertion arrangement from the rear part.

Since the rotating shaft 4c is set to roll with respect to the bearing portion 1d of the exterior body 1, the outer diameter of the rotating shaft 4c of the lid 4 is vertically separated from the rotation of the rotating shaft 4c and the axis of the exterior body. It is determined by the direction and the distance traveled in the opposite direction. In this embodiment, the rotating shaft 4c is rotated 90 degrees and moved 1.5 mm in the direction vertically separated from the axis of the exterior body and in the opposite direction, so that the outer diameter E of the rotating shaft 4c is E = 1.5 mm. × 4 / π ≒ 1.91 mm
Will be.

A groove (spring fixing portion 4e) extending inward from the side surface is formed on the side surface of the columnar rotating shaft 4c of the lid body 4. Further, the side surface 1p and the flat surface 1q are formed by the projecting portion 1o protruding inward from the inner wall of the exterior body 1. A groove (spring fixing portion 1f) formed in an L shape from the surface toward the inside of the protruding portion 1o is formed on the flat surface 1q. Then, one end of the spring fixing portion 1f penetrates the side surface 1p.
A leaf spring 12 as a repellent member is arranged between the spring fixing portion 4e and the spring fixing portion 1f as shown in FIG. 8, and the lid 4 closes the front end opening 1a of the exterior body 1. A force is applied in the direction (in the case of a leaf spring, the "repulsion" in the present invention is a force in the direction of deforming the leaf spring, but hereinafter, a force for returning the deformation is used as the force of the spring. It is called resilience.) The leaf spring 12 is a deformation that extends from the exterior body fixing portion 12a that is inserted and fixed in the spring fixing portion 1f of the exterior body 1 and is bent in an L shape, and the exterior body fixing portion 12a, and the front is curved. The portion 12b is formed from a lid fixing portion 12c that bends from the tip of the deformed portion 12b toward the exterior body fixing portion 12b side and is inserted and fixed into the spring fixing portion 4e of the rotating shaft 4c.
The leaf spring 12 is arranged on the exterior body 1, and when the lid body 4 rotates and moves in a direction vertically separated from the axis of the exterior body to open the front end opening 1a of the exterior body 1, the deformed portion 12b It is deformed and fixed in the direction in which the curvature of the curved portion becomes smaller. Therefore, when the lid 4 closes the front end opening 1a of the exterior body 1, the deformed portion 12b of the leaf spring 12 exerts a force to maintain the original state before the deformation, so that the lid 4 is closed. Maintain the state of doing.

The materials of the annular elastic body 5 and the annular elastic body 11 that keep the space where the pen tip exists in an airtight state when the lid is closed include butyl rubber, isobutylene rubber, butadiene rubber, styrene-butadiene rubber, ditryl rubber, and chloroprene rubber. Butyl rubber, ethylene propylene rubber, chlorosulfonated polyethylene, chlorinated polyethylene, acrylic rubber, silicon rubber, acrylonitrile butadiene rubber, urethane rubber, fluororubber, epichlorohydrin rubber, polysulfide rubber, olefin-based thermoplastic elastomer, styrene-based heat Examples of plastic elastomer rubbers, elastomers, and mixtures thereof may be used as long as they have excellent chemical resistance to ink and gas permeability that affects airtightness. Among them, butyl rubber has chemical resistance and resistance. It is preferable because it has excellent gas permeability and can perform good sealing. In particular, since butyl halogenated rubber has a small compression set, elastic deformation during sliding can easily return to its original shape when stationary, and good sealing and sliding can be performed. preferable.
Further, by arranging the annular elastic body 11 at a position close to the lid body 4, the storage space of the pen tip 2 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 pen tip 2, the size of the storage space of the pen tip 2 greatly affects the drying of the pen tip in the storage space, so that the drying of the pen tip can be suppressed more effectively.

By applying a non-volatile liquid material to the sliding contact portion of each member, it is possible to suppress friction during sliding contact. The refractory liquid material 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 higher and 500,000 mPa · s or lower (20 ° C.). , Soybean oil, rapeseed oil, corn oil, red flower oil, rice oil, cottonseed oil, sesame oil, peanut oil, olive oil, palm oil, etc. Examples of synthetic lubricating oils include hydrocarbon-based synthetic lubricating oils such as Α-olefin (poly-Α-olefin), polybutene (polyisobutylene), and alkylbenzene, diesters (dibasic acid esters), and polyol esters. Fatty acid ester synthetic lubricating oil such as (hindered ester), silicone synthetic lubricating oil such as silicone oil, silicic acid ester, silane, fluorosynthetic lubricating oil such as chlorofluorocarbon, perfluoropolyether, fluoroester, phenyl ether , Phosphate ester and the like. These may be used alone or in combination of two or more. Further, these may be gelled.
In particular, when synthetic resin, rubber, elastomer, etc. are used for the members constituting the sliding contact portion, they are chemically stable to 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 easily spread on the surface of substances, and side chains and / or both ends are modified with organic groups. Also, amino-modified, epoxy-modified, carbinol-modified, mercapto-modified, carboxyl-modified, methacryl-modified, polyether-modified, phenol-modified, silanol-modified, aralkyl-modified, fluoroalkyl-modified, long-chain alkyl-modified higher fatty acid ester-modified, higher fatty acid-containing Such modified silicone oils are preferably used. Further, straight silicone oils such as polydimethylsiloxane, polymethylhydrogensiloxane, polymethylphenylsiloxane, and cyclic dimethylsiloxane have little change in viscosity with temperature, and are therefore not easily affected by environmental changes and the like.
In addition to this portion, these refractory liquid substances can be arranged on a member whose liquidtightness is to be imparted or whose sliding resistance is to be reduced.
In this embodiment, polydimethylsiloxane having a freezing point of −50 ° C. or lower, a boiling point of 200 ° C., and a viscosity of 10000 mPa · s (20 ° C.) is applied to the sliding contact portion of each member as a refractory liquid substance. It is intervened to achieve airtightness and a low coefficient of friction for sliding.

9 and 10 show a state in which the lid 4 opens the front end opening 1a and the pen tip 2 protrudes.
As the writing tool body 3 advances, the writing tool body 3 and the inner cam portion 4d of the lid body 4 come into contact with each other, and the writing tool body 3 pushes the lid body 4 against the elastic force of the leaf spring 12 to forcibly push the lid body 4. Attempts to move in a direction vertically separated from the axis of the exterior body. At this time, the deformed portion 12b of the leaf spring 12 is deformed so that the curvature of the deformed portion 12b becomes smaller as the lid 4 moves in the direction vertically separated from the axis of the exterior body. As a result, the restoring force of the leaf spring 12 causes the rotating shaft 4c and the lid 4 to rotate as they move in a direction vertically separated from the axis of the exterior body. In the middle of the operation of the rotating shaft 4c, the locking projection 4f provided at the end of the lid 4 gets over the projection 1g provided on the inner wall of the exterior body 1, and the rotation of the lid 4 ends, and the lid 4 ends. The lid is maintained in the open state against the restoring force of the leaf spring 12. The writing tool main body 3 further advances, releases the contact of the lid 4 with the inner cam portion 4d, and causes the pen tip 2 to protrude from the front end opening 1a of the exterior body 1. At the position where the pen tip 2 protrudes, the front protrusion 3a provided behind the writing tool main body 3 is locked to the gear member 7 arranged inside the tip of the clip 6 to maintain the pen tip protruding state.

11 and 12 show a state in which the writing tool main body 3 is retracted halfway from the pen tip protruding state. Note that FIGS. 11 and 12 are shown as diagrams corresponding to FIGS. 2 and 3, respectively.
When the writing tool main body 3 is further advanced from the protruding locked state of the pen tip 2, the rear protrusion 3b rotates the gear member 7, the front protrusion 3a and the gear member 7 are released from the lock, and the writing tool main body 3 is a coil spring. Receives the resilience of 8 and begins to retreat.
When the writing tool main body 3 starts to retract, the lid 4 is locked and does not rotate. When the writing tool main body 3 is further retracted, the release protrusion 3f provided at the tip of the writing tool main body 3 abuts on the inside of the lid portion 4a of the lid body 4, and the writing tool main body 3 pushes the portion of the lid body 4 to push the lid body. 4 moves in the direction opposite to the direction vertically separated from the axis of the exterior body while rotating in the direction of closing the front end opening 1a of the exterior body 1, gets over the protrusion 1g, and is closed by the elastic force of the leaf spring 12. It becomes a state.
When the lid 4 gets over the protrusion 1g, the writing tool main body 3 comes into non-contact with the lid 4 and retracts and is stored. In the present invention, since the writing tool main body 3 and the lid 4 are not in contact with each other, the chance of the pen tip 2 and the lid 4 coming into contact with each other is suppressed as much as possible. Even if the tip is used, it is possible to avoid damaging or crushing the pen tip as much as possible.
A coil spring is formed by arranging a leaf spring 12 on the rotating shaft 4c of the lid 4 arranged inside the exterior 1 and the spring fixing portion 1f provided on the wall inside the exterior to apply a closing force to the lid 4. It is not necessary to give the urging force of 8 to the lid 4. Therefore, the annular elastic body 11 that seals the rear part can be arranged behind the lid body 4, and the space where the pen tip exists can be made smaller when the lid body is closed. Further, since the annular elastic body 11 can be fixedly arranged on the inner wall of the exterior body 1, the airtightness between the exterior body 1 and the annular elastic body 11 can be more reliably maintained.

(Example 2)
13 to 27 show another example. The difference from the above example is that the leaf spring 12 that exerts a force in the direction in which the lid 4 closes the front end opening 1a of the exterior body 1 is eliminated, and instead, the writing tool main body 3 is urged backward. This is based on the resilience of the coil spring 8.
That is, the annular elastic body 11 is arranged so as to be movable back and forth, and the annular member 13 formed of synthetic resin is arranged on the front side of the annular elastic body 11 so as to be movable back and forth together with the annular elastic body 11. The pressing force on the straight line of the spring 8 is applied to the lid 4 via the annular elastic body 11 and the annular member 13.

As shown in FIG. 13 which is a perspective view of the lid body 4, the lid body 4 includes a spherical lid portion 4a capable of closing the front end opening 1a of the exterior body 1 and a columnar rotating shaft 4c in a protruding state to the outside. It has a side wall portion 4b. The tip surface of the rotating shaft 4c is formed of an inclined curved surface so as not to interfere with the exterior body 1 when the lid body 4 rotates and moves inside the exterior body 1. Further, on the side surface of the rotating shaft 4c, an opening stopper 4g, a closing stopper 4h, and a protruding outer cam portion 4i are formed to define the end points of the operation when the lid 4 is opened and closed.
Further, the portion between the side wall portions 4b of the lid body 4 is a space portion, and when the lid body 4 rotates and moves to open the front end opening 1a of the exterior body 1, the pen tip 2 and the writing tool main body are opened. It forms a passage through which 3.
Further, an inner cam portion 4d, which is an inward protrusion, is formed inside the side wall portion 4b. The inner cam portion 4d is a portion that comes into contact with the writing tool main body 3 by advancing the writing tool main body 3.
In this embodiment, the inner cam portion 4d and the lid portion 4a are provided at the farthest positions on the side wall portion 4b. By forming the inner cam portion 4d and the lid portion 4a at positions as far apart as possible, a wide space is provided between the lid portion 4a and the contact point between the writing tool main body 3 and the inner cam portion 4d of the lid body 4. In the closed state of the lid body 4, the distance in the longitudinal direction from the most advanced position of the pen tip 2 to the contact point between the writing tool main body 3 and the inner cam portion 4d of the lid body 4 can be obtained, and the writing tool can be obtained. A long pen tip 2 can be provided at the tip of the main body 3. Further, the distance from the inner cam portion 4d to the rotation shaft 4c can be increased, and the lid 4 can be rotated with a smaller knock load.
Since the inner cam portion 4d is a portion that receives a load from the writing tool main body 3 to rotate and move the lid body 4, if the inner cam portion 4d is too small, it may be damaged during operation. Therefore, when the lid 4 is made of a thermoplastic resin, the cross-sectional area of the inner cam 4d is preferably 0.2 mm ² or more.
However, if the inner cam portion 4d is increased, the contact point between the inner cam portion 4d and the writing tool main body 3 approaches the rotation center of the lid body 4, and the load for rotating the lid body 4 increases. It is preferable to keep the contact point as far as possible from the rotating shaft 4c in terms of reducing the knock load. Therefore, it is preferable that the diameter of the inner cam portion 4d is 0.4 mm or more and 5.0 mm or less.
Further, the outer cam portion 4i has a cam slope 4j, and the cam slope 4j receives a forward urging force by the coil spring 8 via the annular member 13, and the lid body 4 closes the front end opening 1a. Rotate in the direction of
The lid 4 uses polyacetal, which has self-lubricating properties and is excellent in friction and wear resistance.
In the present invention, the lid has a rotating shaft on the side wall and a bearing portion for the rotating shaft inside the exterior body, and the rotating shaft of the bearing portion is vertically separated from the axis of the exterior body. It has an elongated concave portion having a distance to move in the direction opposite to that of the bearing portion, and the lid rotates as the writing tool body advances, and the lid portion rotates vertically along the elongated concave portion of the bearing portion from the axis of the exterior body. Since it is a haunting type writing tool characterized in that it moves in a direction of separation, it rotates so as to be separated from the inner edge of the front end opening of the exterior body in which the lid is in close contact. Therefore, the sliding resistance between the lid and the inner edge of the front end opening is reduced, the wear of the inner edge of the lid and the front end opening is suppressed, and the airtightness can be maintained.
Therefore, even a material having a slightly inferior wear resistance can be appropriately selected. As an example, polypropylene, polybutylene terephthalate, polyethylene, and polyethylene terephthalate, which are materials having low gas permeation, can be positively used.
Since the lid body 4 has a U-shape in shape, the side wall portion 4b of the lid body 4 tends to bend inward during injection molding of parts. In order to prevent this bending, the gate, which is the resin inflow port of the mold, is arranged so as to come to the outer central portion of the lid portion 4a. Further, in order to realize the contact between the lid body 4 and the front end opening 1a more quickly, the surface of the lid portion 4a is formed to be flat. Further, as shown in FIG. 14, a head portion 4k projecting from the surface of the lid portion 4a is formed, and a gate is arranged at the top of the head portion 4k. In order to eliminate the influence of rubbing between the lid 4 and the front end opening 1a due to the remaining gate, the periphery of the remaining gate is provided as a recess (not shown). Further, when the diameter of the gate is relatively large and the thermoplastic resin can sufficiently retain the holding pressure after the flow in molding, the bending after molding is small, and therefore the gate diameter is 0.5 mm. It is preferably 0.8 mm or less.

As shown in FIG. 15 which is a perspective view of the annular member 13, the annular member 13 has a connecting portion 13a for connecting to the annular elastic body 11 and a side wall portion 13b for transmitting a forward urging force to the lid 4. ing. A contact surface 13c is provided at the front end of the side wall portion 13b, and the contact surface 13c includes an inclined surface 13d and a locking groove 13e in which the outer cam portion 4i of the lid 4 is depressed and locked when the lid 4 is opened. It has a protrusion 13f. The side wall portion 13b transmits the elastic force of the rear coil spring 8 to the outer cam portion 4i of the lid body 4 via the contact surface 13c, and the side wall portion 13b closes the front end opening 1a of the exterior body 1 to the lid body 4. It gives a rotational force.
Further, the inner shape of the connecting portion 13a is formed with a middle hole portion 13g through which the small diameter portion 3d of the writing tool main body 3 can pass, but the small diameter portion 3d of the writing tool main body 3 having a circular cross section can be in point contact with the small diameter portion 3d. In addition, the inner hole portion 13g has a shape in which the corner portion of the quadrangle is curved.
Since the annular member 13 is a member that slides in contact with the lid 4 and moves the lid 4 in the direction of rotating and vertically separating from the axis of the exterior body and in the opposite direction, it has self-lubricating property and frictional wear resistance. Uses excellent polyacetal.

As shown in FIG. 16 which is a vertical sectional perspective view of the annular elastic body 11, the annular elastic body 11 has the outer body 1 in a state where the lid 4 closes the front end opening 1a of the outer body 1 to the outside. It has an outer sealing rib 11a that is in airtight contact with the inner surface of the outer body and an outer tilt preventing rib 11b that prevents the annular elastic body 11 from tilting too much when sliding in the exterior body 1, and also has an annular shape. Inside the elastic body 11, an inner sealing rib 11c that airtightly slides with the writing tool main body 3 is provided. The inner sealing rib 11c is a double-row rib, and the above-mentioned refractory liquid matter stays between the ribs to ensure sealing with the writing tool main body 3 and suppress sliding resistance to a low level. There is. Further, by shifting the forming positions of the outer sealing rib 11a and the inner sealing rib 11c back and forth in the axial direction, the outer sealing rib 11a bends inward due to the contact with the exterior body 1 and the inner sealing due to the contact with the writing tool main body 3. Since the bending of the rib 11c to the outside does not collide with each other in the radial direction, the sliding resistance when the writing tool main body 3 moves and when the annular elastic body 11 moves backward is reduced.

As shown in FIGS. 17 and 18 which are vertical cross-sectional perspective views of the tip of the exterior body 1, the rotation shaft 4c of the lid 4 rotates and is perpendicular to the axis of the exterior body inside the exterior body 1. It has a bearing portion 1d that is movably attached in the direction of separation and in the opposite direction. The bearing portion 1d is provided with a wall in a direction vertically separated from the front and the axis of the exterior body and in the opposite direction in order to restrict the movement of the rotation shaft 4c of the lid body 4. The distance between the direction vertically separated from the axis of the exterior body of the front wall (receiving surface 1e) and the wall provided in the opposite direction is the direction in which the rotating shaft 4c is vertically separated from the axis of the exterior body. And vice versa . Therefore, the bearing portion 1d has a concave shape that is long in the direction vertically separated from the axis of the exterior body. The rear part of the rotating shaft 4c is an open portion without a wall, but this is because when the lid body 4 is arranged on the exterior body 1, the lid body 4 facilitates the insertion arrangement from the rear part. The movement of the lid 4 in the rear direction is restricted by the contact surface 13c of the annular member 13 arranged behind the lid 4.
Further, at both ends of the receiving surface 1e of the bearing portion 1d, a flat opening stopper contact portion 1h and a closing stopper contact portion 1i are formed. The end point of the opening operation of the lid 4 is defined by the opening stopper 4g of the lid 4 coming into contact with the opening stopper contact portion 1h. On the other hand, the closing stopper 4h regulates the end point in the closing operation of the lid 4, and the closing stopper 4h abuts on the closing stopper contact portion 1i to regulate the closing operation of the lid 4.
In the present invention, since the rotating shaft 4c is set to roll with respect to the bearing portion 1d of the exterior body 1, the outer diameter of the rotating shaft 4c of the lid 4 is perpendicular to the rotation of the rotating shaft 4c and the axis of the exterior body. It is determined by the direction of separation and the distance of movement in the opposite direction. In this embodiment, the rotation shaft 4c is rotated by 90 degrees and moved by 1.5 mm in the direction vertically separated from the axis of the exterior body and in the opposite direction. At this time, the outer diameter E of the virtual circle consisting of the outer diameter of the portion where the bearing portion 1d of the rotating shaft 4c is in contact with each other so as to roll is E = 1.5 mm × 4 / π ≈ 1.91 mm.
Will be.
Further, the receiving surface 1e of the bearing portion 1d that comes into contact with the rotating shaft 4c is a surface (fine uneven surface) on which fine irregularities are formed, and the inner cam portion 4d from the writing tool main body 3 is from the axis of the exterior body. When a force is applied in the direction of vertically separating the rotating shaft 4c, the rotating shaft 4c is prevented from slipping, and the rotating shaft 4c can rotate.

As shown in FIG. 19, which is a perspective view of the tip portion of the writing tool main body 3, the front end surface of the writing tool main body 3 has a concave curved surface 3g that abuts against the inner cam portion 4d of the lid body 4 to give a rotational force to the lid body 4. Is provided.
The concave curved surface 3g of the writing tool main body 3 is composed of curved surfaces having two first and second radius of curvature from the rear side to the front end portion of the writing tool main body 3, and is hung from the concave curved surface 3g to the cut portion 3h. It is connected to the tapered surface and the vertical surface. The radius of curvature of the first curved surface is formed by a curved surface larger than the radius of curvature of the second curved surface, and the two curved surfaces are gently connected so as not to have an angle as much as possible. The inner cam portion 4d of the lid 4 moves on the concave curved surface 3g from the second curved surface to the first curved surface.
Further, a release protrusion 3f that contacts the inner hole portion 13g of the annular member 13 is provided on the outer surface of the tip of the small diameter portion 3d of the writing tool main body 3, and a cutting portion 3h is provided on the opposite side of the release protrusion 3f. ing.
Further, between the front end opening 1a and the pen tip holder 2b, an air groove 3i is provided in the writing tool main body 3 so that gas can pass through the inside and the outside of the writing tool main body 3. By creating the air groove 3i on the release protrusion 3f side, the wall thickness of the writing tool main body 3 on the release protrusion 3f side becomes thinner, and when the writing tool main body 3 is created by injection molding, the release protrusion 3f does not drip. Easy to make.

As shown in FIG. 20, which is a cross-sectional view of the tip portion of the exterior body 1, the annular elastic body 11, the exterior body 1, and the writing tool main body 3 are used to seal the pen tip sealing space rearward. The inner sealing rib 11c of the body 11 slides and seals with the writing tool main body 3, and the outer sealing rib 11a slides with the outer body 1 and seals. That is, in order to perform sealing, the inner diameter of the inner sealing rib 11c (part A in FIG. 20) is smaller than the outer diameter of the writing tool main body 3 (part B in FIG. 20), and the outer diameter of the outer sealing rib 11a (part A in FIG. 20). The C part) is set to be larger than the inner diameter of the exterior body 1 (D part in FIG. 20), but if the diameter difference between the members, that is, BA and CD, is large, the sealing becomes strong. Since the amount of friction that becomes a load when the writing tool main body 3 moves back and forth increases, the sliding becomes worse. Therefore, in order to obtain a good knock feeling, the diameter difference between the members is preferably 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 can be obtained. The diameter difference between the inner sealing rib 11c and the writing tool main body 3 is 0.3 mm, and the diameter difference between the outer sealing rib 11a and the outer body 1 is 0.2 mm.

In FIGS. 21 and 22, as the writing tool main body 3 moves forward, the lid 4 rotates and moves in a direction vertically separated from the axis of the exterior body, opens the front end opening 1a of the exterior body 1, and opens the pen tip. 2 and the writing tool main body 3 are shown to protrude from the front end opening 1a. For convenience of explanation, FIG. 21 is a vertical cross-sectional view, and the pen tip 2 is not displayed. Further, FIG. 22 shows the exterior body 1 and the annular elastic body 5 as vertical cross sections. The steps (1) to (6) in FIGS. 21 and 22 indicate the same moment. 23, 24 and 25 are forward enlarged views of the stages (1), (3) and (6) of FIG. 22, respectively, showing the rotation of the rotation shaft 4c of the lid 4 and the axis of the exterior body. The state of movement in the direction vertically separated from is shown in detail.
By advancing the writing tool main body 3, the concave curved surface 3g of the writing tool main body 3 and the inner cam portion 4d of the lid 4 come into contact with each other, forming a long concave shape in a direction vertically separated from the axis of the exterior body having the lid 4 on the bearing portion 1d. It tries to forcibly move along the direction vertically separated from the axis of the exterior body. Here, since the receiving surface 1e of the bearing portion 1d is a fine concavo-convex surface, the rotating shaft 4c of the lid 4 is prevented from slipping due to the sliding resistance of the fine concavo-convex surface. Therefore, from this state, the force for the rotating shaft 4c to move in the direction vertically separated from the axis of the exterior body while sliding on the receiving surface 1e of the bearing portion 1d is due to the sliding resistance of the fine concavo-convex surface. It is converted into a force that rotates on the receiving surface 1e. Therefore, the rotating shaft 4c moves in a direction vertically separated from the axis of the exterior body while rotating. The sliding resistance between the receiving surface 1e of the bearing portion 1d and the rotating shaft 4c is the forward direction that the contact surface 13c of the annular member 13 gives to the outer cam portion 4i of the lid 4 due to the elastic force received from the coil spring 8. Since it is larger than the urging force on the bearing, the rotating shaft 4c can move in a direction vertically separated from the axis of the exterior body while rotating.
As the lid 4 rotates and moves in a direction vertically separated from the axis of the exterior body, the annular member 13 and the annular elastic body 11 are pushed down by the rotation of the outer cam portion 4i of the lid 4 and move backward. Move (step 0002). At this time, since the diameter of the inner wall of the exterior body 1 is slightly increased from the rear of the portion in contact with the outer sealing rib 11a of the annular elastic body 11, the annular elastic body 11 moved in the rearward direction. The contact between the outer sealing rib 11a and the exterior body 1 is reduced, and the sliding resistance is reduced. Therefore, the resistance required for the annular elastic body 11 and the annular member 13 to lower in the rearward direction becomes small, that is, the load in the forward direction of the writing tool main body 3 for rotating the lid 4 can be small, so that the knock load is low. Is something that can be done.
When the writing tool main body 3 advances to the state of the step (4), the outer cam portion 4i of the lid body 4 and the inclined surface 13d of the annular member 13 come into contact with each other. Since the annular member 13 receives the elastic force of the coil spring 8 from the rear and applies an urging force to the lid 4 in the forward direction, the outer cam portion 4i of the lid 4 is pressed by the inclined surface 13d of the annular member 13. Then, it slides on the inclined surface 13d and enters the locking groove 13e. (Step (5)). At this time, the contact between the outer cam portion 4i of the lid body 4 and the bottom surface of the locking groove 13e is aligned with the rotation axis 4c of the lid body 4 with respect to the direction in which the force is applied from the annular member 13. , No rotational force is applied to the lid body 4, the rotation of the lid body 4 is stopped, and the lid body 4 is locked. It should be noted that the locking groove 13e does not have to be aligned with the rotation axis 4c of the lid 4 with respect to the direction in which the force is applied from the annular member 13 due to an error in the member dimensions, variations in assembly, etc. depending on the product. The outer cam portion 4i of the lid 4 is locked to the step portion 13h of the lid body 4. Further, even if the lid body 4 rotates too much, it comes into contact with the protrusion 13f of the annular member 13, the rotation of the lid body 4 ends, and the lid body 4 is locked in that state.
Further, in the lid body 4, the opening stopper 4g formed on the side surface of the rotating shaft 4c comes into contact with the opening stopper contact portion 1h formed on the bearing portion 1d of the exterior body 1 to rotate the lid body and the axis of the exterior body. It prevents excessive movement in the direction vertically separated from the bearing.
When the lid 4 is locked, the inner cam portion 4d of the lid 4 and the concave curved surface 3g of the writing instrument body 3 do not come into contact with each other. The tips of the pen tip 2 and the writing instrument body 3 are projected. (Stage (6))
At the position where the pen tip 2 protrudes, the front protrusion 3a provided behind the writing tool main body 3 is locked to the gear member 7 arranged inside the tip of the clip 6 to maintain the pen tip protruding state.

26 and 27 show a state in which the lid 4 rotates as the writing tool main body 3 retracts to close the front end opening 1a of the exterior body 1. For convenience of explanation, FIG. 26 is a vertical cross section, and FIG. 27 shows the exterior body 1 and the annular elastic body 5 as a vertical cross section. In addition, each step (1)-(6) of FIG. 26 and FIG. 27 shows the same moment.
When the writing tool main body 3 is further advanced from the protruding locked state of the pen tip 2, the rear protrusion 3b rotates the gear member 7, the front protrusion 3a and the gear member 7 are released from the lock, and the writing tool main body 3 is a coil spring. Receives the resilience of 8 and begins to retreat. At the stage when the writing tool main body 3 starts to retract, the lid 4 does not rotate because it is locked by the annular member 13.
When the writing tool main body 3 retracts to the state of the stage (2), the release protrusion 3f provided at the tip of the writing tool main body 3 comes into contact with the inner hole portion 13g of the annular member 13, and the writing tool main body 3 further reaches the state of the stage (3). When retracted, the writing instrument body 3 retracts while the annular member 13 tilts along the cut portion 3h provided on the opposite side of the release protrusion 3f of the writing instrument body 3.
The clearance between the inner hole 13g and the writing instrument main body 3, the axial width of the inner hole 13g, the height and angle of the release protrusion 3f of the writing instrument main body 3, and the position of the cut portion 3h and the release protrusion 3f of the writing instrument main body 3. If the relationship is not appropriate, the annular member 13 will not tilt, and the writing instrument main body 3 and the annular member 13 will be in a state of being stuck, or the annular member 13 will not be sufficiently tilted. As a range of good operation that does not cause any trouble, the clearance between the inner hole portion 13 g and the writing tool main body 3 is 0.05 mm or more and 0.5 mm or less, and the axial width of the inner hole portion 13 g is 0.2 mm or more and 1.5 mm. The height of the release protrusion 3f of the writing tool main body 3 is 0.15 mm or more and 0.4 mm or less, the angle of the release protrusion 3f on the rear side of the axis is 155 ° or more and 170 ° or less, and the cut portion 3h of the writing tool main body 3 The clearance between the starting portion on the rear side of the shaft and the starting portion on the rear side of the shaft of the release protrusion 3f is 0.15 mm or more and 0.5 mm or less.
When the annular member 13 is tilted, the locking balance between the lid 4 and the annular member 13 is lost, and the ring member 13 is tilted.
Further, the step portion 13h of the annular member 13 is disengaged from the rotational track of the outer cam portion 4i of the lid body 4 and the outer cam portion 4i is released from the step portion 13h, so that the outer cam portion 4i is released from the rear coil spring 8. The pressing force in the forward direction is transmitted to the outer cam portion 4i of the lid 4 through the contact surface 13c of the annular elastic body 11 and the annular member 13, and the pressing force rotates in the direction of closing the rotating shaft 4c of the lid 4. Power works. However, since the receiving surface 1e of the bearing portion 1d is a fine concavo-convex surface as described above, the rotating shaft 4c of the lid 4 is prevented from slipping due to the sliding resistance of the fine concavo-convex surface. Therefore, from this state, the force for rotating the rotating shaft 4c in the closing direction is in the direction opposite to the direction in which the receiving surface 1e is vertically separated from the axis of the exterior body due to the sliding resistance of the fine concavo-convex surface. It is converted into a moving force. Therefore, the rotating shaft 4c moves in the direction opposite to the direction vertically separated from the axis of the exterior body while rotating. (Stage (4)).
Even if the locking balance between the lid 4 and the annular member 13 is not lost due to errors in member dimensions, variations in assembly, etc. depending on the product, the protrusion 13f of the annular member 13 is covered by tilting the annular member 13. The outer cam portion 4i of the body 4 is pushed, the outer cam portion 4i is forcibly pushed out from the locking groove 13e, and the lid body 4 rotates in the closing direction.
The outer cam portion 4i of the lid 4 that has come out of the locking groove 13e of the annular member 13 is pressed against the contact surface 13c of the annular member 13 and receives an elastic force in the direction of closing the front end opening 1a of the exterior body 1. , The lid 4 closes the front end opening 1a (step (6)).
As for the height of the step portion 13h of the annular member 13, if it is too high, the locking cannot be released, and if it is too low, the locking cannot be performed. Therefore, the height of the step portion 13h is 0.03 mm or more and 1.0 mm. The following are good.
Further, the release protrusion 3f of the writing tool main body 3 is provided on the small diameter portion 3d of the writing tool main body 3.
Since the small diameter portion 3d is a portion that is in airtight contact with the annular elastic body 11, the core pin is pulled out first and bent inward so as not to generate a parting line or the like formed at the joint of the mold. In this way, it is molded by a method of taking it out from the mold (so-called unreasonable removal). In order to prevent the release protrusion 3f from being crushed during this forcible pulling, the rear side angle of the release protrusion 3f is set to an angle of 155 ° or more, and the apex portion of the release protrusion 3f is provided with a flat surface to reinforce it. is doing.
In this way, the rotating shaft 4c rotates due to the sliding resistance between the rotating shaft 4c of the lid 4 and the bearing portion 1d of the exterior body 1, and moves in the direction vertically separated from the axis of the exterior body and in the opposite direction. As a result, the urging force that urges the lid 4 in the forward direction and the urging force that urges the cursive body 3 in the rear direction can be configured by the elastic force of the coil spring 8. Therefore, the arrangement of the parts inside the exterior can be simplified, and the molding and assembly of the parts can be facilitated.
In this way, the bearing portion 1d of the exterior body 1 is formed as a long receiving portion in the direction vertically separated from the axis of the exterior body and in the opposite direction, and the surfaces of the receiving surface 1e and the rotating shaft 4c of the lid 4 are finely uneven. By forming the surface (fine uneven surface) formed on the surface, rolling resistance is generated on the contact surface between the rotating shaft 4c and the bearing portion 1d, and the rotation and movement of the lid can be facilitated. Further, since there is no wear on the bearing portion of the rotating shaft due to repeated opening and closing of the lid, damage to the rotating shaft can be prevented and durability can be improved. In addition, the diameter of the rotating shaft becomes smaller due to wear, and it is possible to prevent malfunction due to rattling of the bearing portion and improve durability.

(Example 3)
28 to 37 show another example.
As in the above example, the rotational force is applied to the lid 4 by utilizing the repulsive force of the coil spring 8 that biases the writing tool main body 3 in the rearward direction.
Further, in this embodiment, a gear is partially formed on the rotating shaft 4c of the lid body 4, and teeth corresponding to the gear are formed on the bearing portion 1d of the exterior body 1. The partially formed gear is rotated by the teeth formed in the bearing portion 1d, so that the rotating shaft moves in the direction vertically separated from the axis of the exterior body and in the opposite direction. ing. As a result, this embodiment can rotate the rotating shaft 4c more reliably than in the second embodiment and move in the direction vertically separated from the axis of the exterior body and in the opposite direction .

A perspective view of the lid 4 is shown in FIG. 28, and a side view is shown in FIG. 29. The lid body 4 of this embodiment has the same shape as that of the second embodiment except that the rotating shaft 4c has a shape described later. Therefore, the description of the portion having the same shape as that of the second embodiment will be omitted.
On the rotation shaft 4c of the lid body 4, when the side wall portion 4b is viewed from the direction (side surface) of FIG. An open cam protrusion 4m is formed so as to project in the direction opposite to the outer cam portion 4i in the direction of 90 degrees. The closed cam protrusion 4l and the open cam protrusion 4m are each inclined so that the width becomes smaller as the distance from the rotating shaft 4c increases. Of this inclination, the inclination formed on the closed cam protrusion 4l side and on the side facing the open cam protrusion 4m is referred to as the inner side surface 4o. It should be noted that this inclination is fitted into the open recess 1j and the open recess 1j formed in the bearing portion 1d of the exterior body 1, which will be described later, and the rotation shaft 4c rotates in the direction perpendicular to the axis of the exterior body and in the opposite direction. It is curved so that it can escape from the open recess 1j and the open recess 1j when moving.
Further, a concave cam portion 4n is formed between the closed cam protrusion 4l and the open cam protrusion 4m of the rotating shaft 4c toward the center of the rotating shaft 4c. The concave cam portion 4n is substantially elliptical because both side surfaces are tapered in a direction that narrows the width toward the center of the rotation shaft 4c and is in contact with the top of the central protrusion 1m of the bearing portion 1d of the exterior body 1. It is connected by a curved surface.
The closed cam protrusion 4l, the open cam protrusion 4m, and the concave cam portion 4n are portions (gear portions) corresponding to the gears partially formed on the rotating shaft 4c described above.
In this embodiment, the rotation shaft 4c is rotated by 90 degrees in the same manner as in the second embodiment, and is moved by 1.5 mm in the direction vertically separated from the axis of the exterior body and in the opposite direction. Therefore, the outer diameter E of the virtual circle of the rotating shaft 4c is set to D = 1.91 mm. The point where the curved surfaces of the closed cam protrusion 4l and the open cam protrusion 4m are closest to each other is arranged in the vicinity of the circumference of the virtual circle having the outer diameter E.
By forming a gear portion including such a closed cam protrusion 4l, an open cam protrusion 4m, and a concave cam portion 4n on the rotating shaft 4c, the direction in which the rotating shaft 4c rotates and is vertically separated from the axis of the exterior body so as to roll. And the operation of moving in the opposite direction can be realized approximately.
At both ends of the gear portion of the rotating shaft 4c, opening stoppers 4g and closing stoppers 4h are formed to define the end points of the operation of the lid 4 at the time of opening and closing.
The opening stopper 4g regulates the end point of the opening operation of the lid 4, and the end point of the opening operation of the lid 4 is set by contacting the flat opening stopper contact portion 1h formed on the bearing portion 1d of the exterior body 1. Prescribe. On the other hand, the closing stopper 4h regulates the end point in the closing operation of the lid 4, and abuts on the flat closing stopper contact portion 1i formed on the bearing portion 1d of the exterior body 1 to define the closing operation of the lid 4. ..

A vertical cross-sectional perspective view of the tip of the exterior body 1 is shown in FIG. 30, and a vertical cross-sectional front view is shown in FIG. 31. The exterior body 1 of this embodiment has the same shape as that of the second embodiment except that the bearing portion 1d has a shape described later. Therefore, the description of the portion having the same shape as that of the second embodiment will be omitted.
In order to restrict the movement of the rotating shaft 4c of the lid 4, the bearing portion 1d of the present embodiment is provided with walls in a direction vertically separated from the axis of the front surface and the exterior body and in the opposite direction. The distance between the direction vertically separated from the axis of the exterior body of the front wall (receiving surface 1e) and the wall provided in the opposite direction is the direction in which the rotating shaft 4c is vertically separated from the axis of the exterior body. And vice versa . Therefore, the bearing portion 1d has a concave shape that is long in the direction vertically separated from the axis of the exterior body.
Further, the receiving surface 1e of this embodiment is formed with an open recess 1j and a closed recess 1k that are tapered so that the distance between the side surfaces of the exterior body 1 becomes smaller toward the front. Then, a tapered surface connecting the opening recess 1j and the closing recess 1k is extended between the opening 1j and the closing recess 1k, and extends rearward from the opening stopper contact portion 1h and the closing stopper contact portion 1i. A central protrusion 1 m is formed. The top of the central protrusion 1 m is in contact with the concave cam portion 4n formed on the rotation shaft 4c of the lid body 4, and thus has an R curved surface.
The opening recess 1j, the closing recess 1k, and the central protrusion 1m are portions (rack portions) corresponding to the teeth formed in the bearing portion 1d described above.
The opening stopper 4g and the closing stopper 4h, which define the end points of the operation when the lid 4 is opened and closed in the previous period, come into contact with both ends of the rack, respectively. Is formed.
The open recess 1j is fitted with an open cam protrusion 4m formed on the rotation shaft 4c of the lid 4 when the lid 4 is in the open state, and the closed recess 1k is when the lid 4 is in the closed state. , The closed cam protrusion 4l of the lid 4 is a recess for fitting.

Next, the operation will be described. Since the connection portion between the outer cam portion 4i of the lid body 4 and the annular member 13 applying a force in the direction of closing the lid body 4 is the same as that of the second embodiment, the description thereof will be described. Omit.
Further, regarding the closing operation, since the operation of the rotating shaft 4c is in the opposite direction of the opening operation and the basic operation is the same, the description thereof will be omitted.
From FIG. 32 to FIG. 37, as the writing tool main body 3 advances, the lid 4 rotates and moves in a direction vertically separated from the axis of the exterior body, opens the front end opening 1a of the exterior body 1, and opens the pen tip. 2 and the writing tool main body 3 are shown to protrude from the front end opening 1a. For convenience of explanation, FIGS. 32 to 37 are enlarged forward views with the exterior body 1 and the annular elastic body 5 as vertical cross sections. Further, the bearing portion 1b of the exterior body 1 hidden behind the back surface of the lid body 4 and not originally visible is shown by a broken line for convenience of explanation.

By advancing the writing tool main body 3, the concave curved surface 3g of the writing tool main body 3 and the inner cam portion 4d of the lid 4 come into contact with each other, forming a long concave shape in a direction vertically separated from the axis of the exterior body having the lid 4 on the bearing portion 1d. It tries to move along the direction vertically separated from the axis of the exterior body. At this time, the closed cam protrusion 4l of the rotating shaft 4c is fitted into the closed recess 1k of the bearing portion 1d. Therefore, when the rotating shaft 4c receives a force in a direction vertically separated from the axis of the exterior body, the inner side surface 4o of the closed cam protrusion 4l presses the inclined surface 1n extending the closing recess 1k and the central protrusion 1m. However, the closed cam protrusion 4l cannot move in the direction vertically separated from the axis of the exterior body due to the closed recess 1k, and rotates around the contact portion between the inner surface 4o of the closed cam protrusion 4l and the inclined surface 1n. It becomes. As a result, since the inner surface 4o of the closed cam protrusion 4l is a curved surface, the contact portion with the inclined surface 1n moves so as to climb the inclined surface 1n (FIG. 33).
When the writing tool main body 3 advances to the state shown in FIG. 34, the contact between the inner side surface 4o of the closed cam protrusion 4l of the rotating shaft 4c and the inclined surface 1n is released. Then, when the R curved top of the central protrusion 1 m formed on the bearing portion 1d comes into contact with the concave cam portion 4n of the rotating shaft 4c, the lid body 4 moves in a direction vertically separated from the axis of the exterior body. Rotate while.
Further, when the writing tool main body 3 advances to the state shown in FIG. 35, the rotating shaft 4c rotates and vertically separates from the axis of the exterior body so that the open cam protrusion 4m of the rotating shaft 4c enters the opening recess 1j of the bearing portion 1d. Move to.
In the state of FIG. 36, the open cam projection 4m of the rotating shaft 4c is in a state immediately before being fitted into the opening recess 1j of the bearing portion 1d, and the outer cam portion 4i of the lid 4 is pressed by the inclined surface 13d of the annular member 13. , Slides on the inclined surface 13d and enters the locking groove 13e.
When the lid 4 is locked by the outer cam portion 4i of the lid 4, the inner cam portion 4d of the lid 4 and the concave curved surface 3g of the writing instrument body 3 do not come into contact with each other. The tip of the pen tip 2 and the tip of the writing instrument body 3 are projected from the front end opening 1a of the exterior body 1 (FIG. 37).

In this embodiment, the protrusions formed on the rotating shaft 4c and the recesses formed on the bearing portion of the exterior body are each formed as two, but two or more protrusions and recesses can also be formed. By increasing the number of protrusions and recesses, the contact between the protrusions and the recesses changes one after another, and the rotational and linear motions can be performed more smoothly. This is the so-called "rack & pinion" in gears.

In this embodiment, two cams are provided on the rotating shaft 4c of the lid 4, and each cam is fitted into the recess of the bearing portion 1d of the exterior body 1 in the closed and open states. At the start of the closing operation, the linear force applied to the lid can be more reliably changed to a force that moves vertically away from the axis of the exterior body and in the opposite direction, and the rotation and movement of the lid 4 can be performed. The operation can be performed reliably.
By operating the rotating shaft so as to roll with respect to the bearing portion in this way, the frictional resistance between the rotating shaft and the bearing portion can be eliminated, and the rotation and movement of the lid can be facilitated. Further, since there is no wear on the bearing portion of the rotating shaft due to repeated opening and closing of the lid, damage to the rotating shaft can be prevented and durability can be improved. In addition, the diameter of the rotating shaft becomes smaller due to wear, and it is possible to prevent malfunction due to rattling of the bearing portion and improve durability.

1 Exterior body 1a Front end opening 1b Rear end opening 1c Slit hole 1d Bearing part 1e Receiving surface 1f Spring fixing part 1g Protrusion 1h Opening stopper contact part 1i Closure stopper contact part 1j Opening recess 1k Closure recess 1m Central protrusion 1n Inclined surface 1o Protruding part 1p Side surface 1q Flat surface 2 Pen tip 2a Pen core 2b Pen tip holder 3 Writing tool body 3a Front protrusion 3b Rear protrusion 3c Shoulder 3d Small diameter part 3e Large diameter part 3f Release protrusion 3g Concave curved surface 3h Air groove 4 Lid body 4a Lid part 4b Side wall part 4c Rotating shaft 4d Inner cam part 4e Spring fixing part 4f Locking protrusion 4g Opening stopper 4h Closure stopper 4i Outer cam part 4j Cam slope 4k Head 4l Closed cam protrusion 4m Open cam protrusion 4n concave cam part 4o inner side surface 5 annular elastic body 6 clip 7 gear member 8 coil spring 9 ink storage body 10 tail plug 10a rib 11 annular elastic body 11a outer sealing rib 11b outer tilt prevention rib 11c inner sealing rib 12 leaf spring 12a Exterior body fixing part 12b Deformed part 12c Lid body fixing part 13 Ring member 13a Connection part 13b Side wall part 13c Contact surface 13d Inclined surface 13e Locking groove 13f Protrusion 13g Middle hole part 13h Step part

Claims (2)

The outer package, and the dynamic possible writing instrument body back and forth with a pen tip to tip, accommodating a lid, the writing instrument body, a lid disposed in front end opening of the outer package due to be advanced or retracted by the operation by linking, by opening and closing the front end opening of the outer package, the slide type writing tool comprising by haunt the pen tip from the tip of the outer body, said lid body is in close contact with the inner edge of the outer member front end opening at closed have a rotating shaft in the side wall portion with those who are having a bearing portion for the rotational shaft in the interior of the exterior body, the bearing portion thereof opposite to the direction in which the rotation axis is vertically spaced from the axis of the outer member It has an elongated concave portion having a distance to move to, and moves in a direction vertically separated from the axis of the exterior body along the elongated concave portion of the bearing portion while the lid body rotates as the writing tool body advances. A haunting writing tool that is characterized by that. A gear portion is formed on the side surface of the rotating shaft provided on the side wall portion of the lid body, while a rack portion with respect to the gear portion is formed on the receiving surface of the elongated concave portion of the bearing portion, and the writing tool main body advances. The linear force associated with the above is transmitted to the gear portion in contact with the gear portion through the rack portion, and the gear portion rolls on the rack portion, so that the lid body rotates and moves in a direction vertically separated from the axis of the exterior body. The haunting type writing tool according to claim 1, wherein the writing tool is characterized in that.

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