JP5526808B2 - Pay-out writing instrument - Google Patents

Description

  According to the present invention, as the writing instrument body having a pen tip at the tip is advanced by operation, the lid that closes the tip opening of the exterior body is rotated to open the tip opening of the exterior body, and the opening The present invention relates to a pay-out type writing instrument in which a pen tip is projected from a front end opening of an exterior body.

Conventionally, driving means for converting the forward movement of the writing instrument body into the rotational movement of the lid body has been provided, and the exterior body tip opening is closed in conjunction with the pen tip extension operation from the tip opening of the exterior body of the writing instrument body. There is known a pay-out type writing instrument that drives a lid that can be put into a writing state. Since it does not have a cap that separates from the writing instrument body, there is no worry of removing the cap and there is no worry of losing the cap, while suppressing ink drying from the pen tip, a fresh handwriting can be obtained over a long period of time, This prevents the pen tip from abruptly contacting another object when not in use.
As a means for driving the lid in conjunction with the pen-tip feeding operation of such a feeding-type writing instrument, an inclined surface is arranged on either the writing instrument main body side that moves forward or the lid that rotates. By placing a projection or the like in contact with this on the other side, the projection on the writing instrument main body side presses the inclined surface of the lid, or the inclined surface on the writing instrument main body side presses the projection on the lid body, What rotates a cover body with advance of a main body is known.
For example, in the thing of Unexamined-Japanese-Patent No. 2008-195054 (patent document 1), the protrusion of a writing instrument main body moves forward in the inclination groove formed in the cover body, and the inclination groove | channel (inclination wall of the cover body) ) To convert to rotary motion.
Moreover, in the thing of Unexamined-Japanese-Patent No. 2008-110527 (patent document 2), the protrusion formed in the inner wall of a cover body is pushed by the planar inclined surface formed in the side part of the writing instrument main body moving forward. The forward movement of the writing instrument body is converted into the rotational movement of the lid.

JP 2008-195054 A JP 2008-110527 A

  In the one described in Patent Document 1, as a driving means for linearly moving the projection formed on the writing instrument body passing through the inclined groove of the lid, as the lid rotates, the contact point between the lid and the projection is It approaches the center of rotation of the lid, shortens the radius of rotation of the orbit of the contact point, increases the force required to rotate the lid, and requires a large knocking force to rotate the lid. there were.

  In the thing of patent document 2, as a drive means to move straightly, a flat inclined surface (with no angle change) formed on the writing instrument main body is used, and the projection formed on the lid is pushed to rotate the lid. The component force generated at the contact point with the projection of the lid body by the forward movement of the inclined surface is always in a constant direction, and the lid body is rotated in relation to the position of the contact point that changes as the lid body rotates. The magnitude of the force that can contribute to the decrease in the amount of force required to increase the load for advancing the writing instrument body by that amount. That is, in the forward movement operation of the writing instrument main body for feeding the pen tip, the force applied to the operation is increased, and a large knocking force is required.

According to the present invention, a writing instrument body having a pen tip at the tip is housed in the exterior body so as to be movable back and forth, and a lid for closing the tip opening of the exterior body is rotatably provided on the inner wall of the exterior body. , by the operation, with the advancing said writing instrument body, causes opening of the distal end opening portion of the rotated with exterior body said lid, made by projecting nib from the tip opening of the package body in which the open feed In the writing instrument, the writing instrument body includes driving means for contacting the inward projection formed on the inner side of the lid body and transmitting a forward movement of the writing instrument body to give a rotational movement to the lid body. However, the gist is a pay-out type writing instrument that is a plurality of inclined surfaces with different angles or a concave curved inclined surface arranged in the writing instrument body.

  By arranging the driving means on the writing instrument main body as a plurality of inclined surfaces with different angles or concave curved inclined surfaces, the direction of the force acting to rotate the lid by the advancement of the writing instrument main body is It can approach the direction of the tangent to the rotation trajectory of the contact point with the body, and can transmit the force most efficiently. Therefore, it becomes a pay-out type writing instrument which can be operated with a light force with little increase or decrease in knock load.

The longitudinal cross-sectional view which shows an example. The perspective view which shows the components of a cover body. The I section enlarged view of FIG. FIG. 3 is a view corresponding to FIG. 3 for explaining the rotation of the lid and the forward movement of the writing instrument body. FIG. 3 is a view corresponding to FIG. 3 for explaining the rotation of the lid and the forward movement of the writing instrument body. The principal part enlarged view explaining the rotation of a cover, and the retraction operation | movement of a writing instrument main body. The fragmentary sectional view of another example. Furthermore, the fragmentary sectional view of another example. The fragmentary sectional view of an example of conventional technology. FIG. 14 is a view corresponding to FIG. 14 for explaining the rotation of the lid and the forward movement of the writing instrument body. The fragmentary sectional view of other examples of conventional technology. The knock load curve with respect to the rotation angle of the cover body in Example 1. FIG. The knock load curve with respect to the rotation angle of the cover body in Example 2. FIG. The knock load curve with respect to the rotation angle of the cover body in Example 3. FIG. The knock load curve with respect to the rotation angle of the cover body in the comparative example 1. The knock load curve with respect to the rotation angle of the cover body in the comparative example 2.

  The writing instrument body is a member that has a pen tip at the tip and contains ink therein. As the nib, a ballpoint pen, a fiber converging body, a porous body such as urethane, or a synthetic resin nib having a communication hole can be used as appropriate. In addition, the ink may be stored in a free state directly in the main body without impregnating an ink storage body such as a fiber converging body or using an ink storage body. As for the ink used, dyes and / or pigments can be used as colorants, and water and organic solvents can be used as appropriate as the main medium.

  For the operation to advance the writing instrument body and feed the pen tip from the tip of the exterior body, a knocking member placed at the rear end of the retractable writing instrument and a slide mechanism on the side are used as appropriate. It can be done. Further, an elastic member such as a coil spring can be arranged between the members to help drive by operation and to seal the lid member.

  When not in use, the lid that closes the front end opening of the exterior body while the writing instrument body is housed in the exterior body opens the front end opening of the exterior body by rotation and is connected to the exterior body by a hinge. Further, the door can be opened outward or inward, or can have a rotating shaft in the member, and can be opened and closed by sliding the opening of the exterior body by rotation. When the lid body is sealed so that it is pressed against the inner edge of the opening of the exterior body, the lid member unexpectedly even when the internal pressure in the sealed chamber inside the lid body increases due to an increase in environmental temperature, etc. Will be prevented from opening. Furthermore, by making the rotation radius as small as possible, the writing instrument itself can be made thin. Moreover, it is preferable that at least one member is made of an elastic material such as synthetic resin, rubber, or elastomer at a contact portion between the members for sealing. In particular, when it is formed of butyl rubber, it is excellent in chemical resistance and gas resistance, so that it is sealed well.

The driving means that contacts the lid and transmits the forward movement of the writing instrument main body to impart the rotational movement to the lid can change the direction of the forward movement force of the writing instrument main body. A so-called cam mechanism is used in which an inclined surface is provided on the writing instrument body and the direction of the force is changed as a component force acting in the normal direction of the surface. The driving means is a plurality of inclined surfaces with different angles arranged on the writing instrument main body or a concave curved inclined surface, and this inclined surface is a virtual in the forward direction of the writing instrument main body passing through the rotation center of the lid. When the distance between the contact point between the inclined surface and the lid (the point where the force is applied) and the virtual straight line in the forward direction of the writing instrument passing through the center of rotation of the lid is short, the angle formed with the straight line is small. By setting a large inclination angle at a position where the distance is long, the normal direction force generated by the driving means can be approximated to the tangent of the rotation trajectory of the contact, and the necessary load can be as much as possible. It can be of low load without change.
In addition, the inclined surface as the driving means can be formed as an edge portion of the wall disposed at the front end of the outer part of the writing instrument body, or another member can be assembled to the writing instrument body as an integral or separable member. In addition, the protrusion of the lid that contacts the driving means may be angular or circular, and in particular by making it circular, it can contact the driving means of the writing instrument body without being caught, and the load Can be suppressed. Further, by providing a protrusion at a position as far as possible from the sealing portion as a position of the protrusion, it is possible to provide a longer pen tip between the contact point with the writing instrument body and the sealing portion. In addition, by reducing the protrusion, it is possible to prevent the contact point from approaching the center of rotation during rotation of the lid, and the rotation radius can always be kept long, so that the lid can be rotated with a smaller knock load. It is. However, if the rotation radius is increased, a large internal space is required for the exterior body in which the lid is accommodated, so that the exterior body becomes thick and may be difficult to use for the user. Therefore, the distance between the rotation center of the lid and the protrusion is preferably 15 mm or less.
In addition, by using a large protrusion, it is possible to suppress as much as possible that the root part of the protrusion that is easily damaged is damaged in repeated durability.

Example 1
An example is shown in FIG.
A writing instrument body 2 is accommodated in the exterior body 1 so as to be movable back and forth.
The writing instrument body 2 is provided with a pen tip 3 made of a fiber converging body at the tip, and stores a storage member 4 that has occluded ink at the back of the inside. In addition, the rear end of the writing instrument body 2 is closed by a tail plug 5. The tail plug 5 is detachable by screwing with the writing instrument body 2 and is airtightly attached, so that the occlusion body 4 accommodated in the writing instrument body 2 can be replaced. In other words, the occlusion body 4 can be replaced when the ink is consumed, and the product can be used repeatedly without being disposable. Therefore, the waste is reduced, and it is environmentally friendly and economically useful. can do.

  The nib 3 is caulked and fixed to a metal nib holder 6, and the nib holder 6 is press-fitted into the tip hole of the writing instrument body 2. The writing instrument main body 2 is composed of a small diameter portion 2 a in which a pen tip holder 6 is inserted at the tip and a large diameter portion 2 b in which the occlusion body 4 is accommodated. There is a shoulder 2c between the small diameter portion 2a and the large diameter portion 2b. A plurality of ribs are formed between the shoulder portion 2c and the small diameter portion 2a to suppress the bending of the small diameter portion 2a. In addition, the air circulation groove | channel is formed in the front-end | tip hole inner side of the writing instrument main body 2 so that air exchange is possible.

  On the rear side of the writing instrument main body 2, a locking projection 2 d and a release projection 2 e are formed at the same position on the axis and separated back and forth. The locking projection 2d advances as the writing instrument body 2 advances by operation, and the gear member 8 disposed inside the tip of the clip 7 integrally fixed to the rear portion of the exterior body 1 and the exterior body 1 It can fit through the hole 1a formed in the side wall. In this positional relationship, it is important to set so that the pen tip 3 protrudes from the tip opening 1b of the exterior body 1. When the writing instrument body 2 is further operated to advance, the rear release protrusion 2e pushes up the clip 7, and the engagement between the locking protrusion 2d and the gear member 8 is released. The writing instrument body 2 receives a rear urging force by a coil spring 9 that abuts against the shoulder 2c, and when the engagement between the locking projection 2d and the gear member 8 is released, the pen tip 3 is moved into the exterior body 1. The writing instrument body 2 is moved back to the position where it is immersed.

  A synthetic resin lid 10 is rotatably arranged inside the front end opening 1b of the exterior body 1 and is in contact with the butyl rubber O-ring 11 disposed in the front end opening 1b of the exterior body 1. Yes. An annular member 12 made of synthetic resin and an elastic airtight member 13 made of butyl rubber are arranged behind the lid body 10. The aforementioned coil spring 9 is disposed between the elastic airtight member 13 and the shoulder 2c of the writing instrument body 2, and the elastic airtight member 13 and the annular member 12 are urged forward with respect to the position of the writing instrument body 2. The front urging force is applied to the lid body 10.

  An outer circumferential contact portion 13 a is formed outside the elastic airtight member 13 and is in circumferential contact with the inner wall surface of the exterior body 1. Further, an inner circumferential contact portion 13 b is formed inside the elastic airtight member 13 and is in circumferential contact with the outer peripheral surface of the small diameter portion 2 a of the writing instrument body 2. As materials for the O-ring 11 and the elastic hermetic member 13, in addition to butyl rubber, isobutylene rubber, butadiene rubber, styrene / butadiene rubber, nitrile rubber, chloroprene rubber, butyl rubber, ethylene propylene rubber, chlorosulfonated polyethylene, chlorinated polyethylene, acrylic Examples include rubber, silicone rubber, acrylonitrile butadiene rubber, urethane rubber, fluoro rubber, epichlorohydrin rubber, polysulfide rubber, olefin thermoplastic elastomer, styrene thermoplastic elastomer rubber and elastomer, and mixtures thereof. As long as it is excellent in chemical resistance and gas permeability that affects the sealability of the ink stored in the ink occlusion body, but butyl rubber is excellent in both chemical resistance and gas permeability. Good sealing It is possible. In particular, since halogenated butyl rubber has a small compression set, the elastic deformation at the time of sliding is easy to return to its original shape when stationary, and good sealing and sliding can be performed.

  The circumferential contact between the O-ring 11 and the lid portion 10a of the lid body 10, the circumferential contact between the outer circumferential contact portion 13a of the elastic airtight member 13 and the inner wall surface of the exterior body 1, and the elastic airtight member The pen tip 3 is maintained in an airtight state by the circumferential contact between the inner circumferential contact portion 13 b of 13 and the outer peripheral surface of the small diameter portion 2 a of the writing instrument body 2. In addition, since the elastic airtight member 13 is disposed at a position close to the lid body 10, the accommodation space of the pen tip 3 is made small, and the nib drying in the accommodation space is suppressed as much as possible. In particular, in the case of a thin nib, the size of the accommodation space of the nib greatly affects the drying of the nib in the accommodation space, so that the nib drying is more effectively suppressed. In addition, on the sliding contact portion of each member, polydimethylsiloxane having a freezing point of −50 ° C. or less, a boiling point of 200 ° C., and a viscosity of 10,000 mPa · s (20 ° C.) is applied as a hardly volatile liquid. It realizes airtightness and low friction coefficient of sliding.

As shown in FIG. 2, which is a perspective view showing parts of the lid body 10, the lid body 10 has a spherical lid portion 10 a that can close the tip opening 1 b of the exterior body 1, and a rotating shaft 10 b that protrudes outward. The rotating shaft 10b is rotatably attached by being connected to the inner wall of the exterior body 1 in a bearing state. A portion between the side wall portions 10c is a space portion, and forms a passage through which the pen tip 3 and the writing instrument body 2 can pass when the lid body 10 is rotated 90 degrees to open the opening of the exterior body 1. Is.
Further, an inner cam portion 10d that is an inward projection is formed on the inner side of the side wall portion 10c, and a protruding outer cam portion 10e is formed on the outer side. The inner cam portion 10d is a portion that comes into contact with the inclined surface 2f as the writing instrument body 2 moves forward.
In the present embodiment, the inner cam portion 10d and the lid portion 10a are provided at the farthest positions on the side wall portion 10c. By forming the inner cam portion 10d and the lid portion 10a as far as possible, a wide space is provided between the lid portion 10a and the contact point between the writing instrument body 2 and the inner cam portion 10d of the lid body 10. In the closed state of the lid 10, the longitudinal distance from the most advanced position of the nib 3 to the contact point between the writing instrument body 2 and the inner cam portion 10d of the lid 10 can be obtained. A long nib 3 can be provided at the tip of the main body 2. Further, the distance from the inner cam portion 10d to the rotating shaft 10b can be increased, and the lid body 10 can be rotated with a smaller knock load.
Since the inner cam portion 10d is a part that receives a load from the writing instrument body 2 and rotates the lid body 10, if the inner cam portion 10d is too small, it may be damaged during operation, and the lid body is made of thermoplastic resin. In this case, the cross-sectional area of the protrusion is preferably 0.2 mm ² or more. However, when the protrusion is enlarged, the contact point between the inner cam portion 10d and the writing instrument body 2 moves, and the distance from the center of rotation of the contact changes short. Therefore, the distance that the contact point moves is made as small as possible. Is preferred. Therefore, it is preferable that the diameter of the protrusion is about 0.4 mm to 5.0 mm and the moving distance of the contact point is within 3 mm.
Further, the cam bias surface 10f of the outer cam portion 10e receives the forward urging force by the coil spring 9 via the annular member 12, and the lid body 10 receives the force applied in the rotation direction. The force in this direction is a force applied in a direction in which the lid body 10 closes the front end opening 1b of the exterior body 1. In other words, in a non-use state, the lid body 10 is caused by the elastic force of the coil spring 9. The writing instrument main body 2 is urged rearward while maintaining the state of closing the tip opening 1b.

  1 is a partial cross-sectional view of the tip (for convenience of description, the outlines of the pen tip 3 and the pen tip holder 6 are indicated by broken lines) As shown in FIG. 3, an inclined surface 2f is formed at the tip of the writing instrument body 2. Has been. The inclined surface 2f is composed of a surface having two first and second inclination angles from the rear to the front and a curved surface portion connecting the surfaces of the respective inclination angles. The first inclined surface is set to 80 degrees and the second inclined surface is set to 35 degrees with respect to the forward direction of the writing instrument body 2 (the direction of arrow A in the figure).

3 to 5 show how the lid body 10 rotates as the writing instrument body 2 moves forward. For convenience of explanation, the outer shapes of the pen tip 3 and the pen tip holder 6 are indicated by broken lines as in the previous figure. As the writing instrument body 2 advances, the inclined surface 2f provided at the tip of the small-diameter portion 2a of the writing instrument body 2 and the inner cam portion 10d provided inside the lid 10 come into contact with each other, and the respective angles of the inclined surface 2f The lid 10 rotates around the rotation shaft 10b by functioning as a driving means for receiving the forward force of the writing instrument body 2 on the inclined surface and displacing it in the rotation direction of the inner cam portion 10d (see FIG. 4).
At this time, the inner cam portion 10d of the lid body 10 sequentially moves on the inclined surface 2f from the second inclined surface toward the first inclined surface. Inclination in which the force of the forward movement of the writing instrument body 2 is a direction that approximates the direction of the tangent (the direction of arrow C in the figure) to the rotation trajectory (in the direction of arrow B in the figure) of the inner cam portion 10d by the inclined surface 2f A component force is generated in the normal direction of the surface (in the direction of arrow D in the figure). As the lid 10 rotates, the direction of the tangent to the rotation trajectory (in the direction of arrow B in the figure) of the inner cam portion 10d always changes, but the forward direction of the writing instrument body 2 on the inclined surface 2f (in the direction of arrow A in the figure). ) Also changes with the movement of the contact point, so the direction of the tangent to the rotation trajectory of the contact point (the direction of arrow C in the figure) and the normal direction of the inclined surface (the direction of arrow D in the figure) ) Can be minimized.

  With the lid portion 10a of the lid body 10 displaced from the distal end opening portion 1b of the exterior body 1 and opening the distal end opening portion 1b, the inner cam portion 10d and the inclined surface 2f are detached, and the lid body 10 is rotated. finish. By further advancing the writing instrument body 2, the inner cam portion 10 d of the lid body 10 moves along the side surface of the small diameter portion 2 a of the writing instrument body 2, and the pen tip 3 protrudes from the tip opening 1 b of the exterior body 1. At this time, as the lid body 10 rotates in the direction of opening the front end opening 1b, the outer cam portion 10e of the lid body 10 presses the annular member 12 rearward, and the annular member 12 and the elastic airtight member 13 are It moves backward while resisting the elastic force of the coil spring 9. With the pen tip 3 protruding from the exterior body 1, the locking protrusion 2 d formed on the writing instrument body 2 and the gear member 8 are locked, and the protruding state of the pen tip 3 is maintained.

  FIG. 6 shows a state in which the lid 10 rotates as the writing instrument body 2 moves backward to close the tip opening 1 b of the writing instrument body 2. For convenience of explanation, the exterior body 1 and the O-ring 11 are not displayed. When the locking state of the writing instrument body 2 is released, the writing instrument body 2 moves backward by the elastic force of the coil spring 9. The writing instrument main body 2 moves rearward, and the inner cam portion 10d of the lid 10 is detached from the surface along the small diameter portion 2a of the writing instrument main body 2, and at the same time, the elastic airtight member 13 is moved forward by the elastic force of the coil spring 9. Move to. When the elastic hermetic member 13 moves forward, the annular member 12 that contacts the elastic hermetic member 13 also moves forward, the cam slope 10f of the outer cam portion 10e formed outside the lid body 10 is pushed, and the lid body 10 Is rotated in the opposite direction to when the pen tip protrudes. The front end opening 1b of the outer package 1 is closed by the lid 10a of the lid 10, and the pen tip 3 is maintained in an airtight state.

(Example 2)
FIG. 7 shows another example. It is shown as a figure corresponding to FIG.
The difference from the above-described example is that the inclined surface 2f which is a driving means for the lid 10 is a curved surface portion connecting the surfaces having the first to fourth inclination angles and the surfaces having the respective inclination angles from the rear to the front. It is a point made of. Specifically, in the present example, each inclination angle is 90 degrees for the first inclined surface and 75 degrees for the second inclined surface with respect to the forward direction of the writing instrument body 2 (the direction of arrow A in the figure). The third inclined surface is 51 degrees and the fourth inclined surface is 18 degrees. The inner cam portion 10d of the lid body 10 moves on the inclined surface 2f from the fourth inclined surface to the first inclined surface through the third inclined surface and the second inclined surface.
By making the inclined surface 2f a combination of surfaces having a plurality of inclination angles, the normal direction of each inclined surface at each contact point between the inclined surface 2f and the inner cam portion 10d can be changed between the inclined surface 2f and the inner cam portion 10d. It is possible to make the direction as close as possible to the direction of the tangent to the rotation trajectory of the contact point (arrow B direction in the figure) (the direction of the tangent to the rotation trajectory of the contact point (arrow C direction in the figure) and the normal of the inclined surface) The angle formed by the direction (the direction of arrow D in the figure) is reduced). Therefore, it is possible to suppress an increase in knock load. In particular, in the present embodiment, the inclined surface 2f that comes into contact in the initial stage of the rotation of the lid body 10 is finely multi-staged, so that the load at the initial stage of rotation can be particularly suppressed.

(Example 3)
FIG. 8 shows another example. It is shown as a figure corresponding to FIG.
As a driving means for the lid 10, a concave curved surface 2 g is provided on the tip end face of the writing instrument body 2. By making the concave curved surface 2g, the angle with respect to the forward direction of the writing instrument body 2 (the direction of arrow A in the figure) can always be changed, and each concave curved surface at each contact point between the concave curved surface 2g and the inner cam portion 10d can be changed. The normal direction with respect to the tangent can be made as close as possible to the direction of the tangent to the rotation trajectory of the contact point between the concave curved surface 2g and the inner cam portion 10d.
In this embodiment, the concave curved surface 2g is a concave curved surface 2g having first and second two radii of curvature from the rear to the front, the radius of curvature of the first curved surface is 17 mm, and the curvature of the second curved surface. The curved surface has a radius of 2.2 mm, and the two curved surfaces are smoothly connected so as not to have an angle as much as possible. The inner cam portion 10d of the lid body 10 moves on the concave curved surface 2g from the second curved surface to the first curved surface.

By the way, the rotation of the lid body 10 due to the advancement of the writing instrument body 2 is accompanied by a lateral movement as the contact point between the writing instrument body 2 and the inner cam portion 10d of the lid body 10 advances. In order to rotate, it is necessary to advance the writing instrument body 2 by the amount of movement in the lateral direction in addition to the amount of advance movement of the contact point. As described above, bringing the direction of the force acting to rotate the lid 10 by the advancement of the writing instrument body 2 closer to the direction of the tangent to the rotation trajectory of the contact point with the lid 10 makes the lid 10 It can be rotated with as little force as possible, and the curve connecting the slopes that apply force in this tangential direction can rotate the lid 10 with the least force. In such a case, For example, in order to rotate the lid 10 by 90 °, the writing instrument body 2 needs to advance at least the same length as the rotation radius of the lid 10, and to rotate 180 °, the diameter corresponding to the double diameter Need to advance the length. Since the tip opening 1b of the exterior body 1 is opened by the rotation of the lid 10 and the pen tip 3 installed at the tip of the writing instrument body 2 needs to protrude, the lid 10 must rotate to some extent. The smaller the rotation radius of the lid body 10, the larger the rotation angle required for opening. Since the pen tip 3 cannot protrude until the lid 10 is sufficiently rotated and the opening 1b is opened, if the amount of advancement of the writing instrument main body 2 required to open the lid 10 is long, the pen tip 3 is increased accordingly. Must be shortened. However, if the nib 3 is short, there is a problem that the visibility at the time of writing becomes poor and it becomes difficult to write characters.
As in this example, the concave curved surface 2g is formed as a first curved surface having a large curvature on the rear side and a second curved surface having a small curvature on the front end side, so that the lid 10 can be rotated on the second curved surface having a small curvature. In the initial stage, by directing the direction of the force applied to the inner cam portion 10d by the concave curved surface 2g toward the front side of the tangent line of the rotation track of both contacts, the load in the initial stage is slightly increased, but the radius of curvature is small. Even if the advancement amount of the writing instrument main body 2 is small, the lid 10 can be rotated greatly, and the necessary advancement amount can be earned accordingly, and the nib 3 can be lengthened. In addition, the initial stage of the process of opening the lid body 10 is a stage that should be called the opening-side stage of the opening, and is the start stage of the operation. Therefore, it is difficult to notice that the load is somewhat high. It also prevents malfunctions such as the pen tip 3 protruding unexpectedly and soiling the surroundings. At the stage of reaching the first curved surface with a large curvature, the tangential direction is directed to the direction close to the axis, so that the lid 10 can be sufficiently rotated even with a light force due to a gentle curved surface.
In order to obtain such a configuration, for example, a lid body 10 having a cross-sectional inner diameter of 5.0 mm to 25.0 mm and a rotation radius of 2.0 mm to 10.0 mm is attached to the exterior body 1. Is 30 ° to 90 ° and the opening opens the pen tip 3 so that the pen tip 3 can protrude, the curvature radius of the first curved surface is 10 mm or more, and the curvature radius of the second curved surface is 1.0 mm to 10 mm. By doing so, the necessary advance amount of the writing instrument body 2 can be 1.5 mm to 10 mm, and the protruding length of the pen tip 3 from the writing instrument body 2 can be 3.0 mm to 16 mm.

  Samples corresponding to Comparative Examples 1 and 2 will be described. Basically, except for the following description, it is a pay-out type writing instrument with parts similar to the above-described embodiment, and has a structure of the prior art that does not use the present invention.

(Comparative Example 1)
The structure shown in FIG. 9 has a structure corresponding to the above-mentioned Patent Document 1.
For convenience of explanation, the exterior body 1, the coil spring 9, the O-ring 11, the annular member 12, and the elastic airtight member 13 are shown as sectional views.
As a driving means for the lid 10, an outward projection 2 h is formed on the small-diameter portion 2 a of the writing instrument body 2, and a cam surface 10 g that abuts against the outward projection 2 h of the writing instrument body 2 is provided on the side surface portion 10 d of the lid 10. Yes. The cam surface 10g is a cut-out surface formed in a part of the side wall portion 10c cut out, and the outward projection 2h of the writing instrument body 2 presses the cover body over the cam surface 10g of the cover body 10. While moving forward. As shown in FIG. 10 showing the state in which the rotation of the lid body 10 is advanced, when the rotation of the lid body 10 proceeds, the contact point between the lid body 10 and the outward projection 2h approaches the rotation center of the lid body, The turning radius of the contact point is shortened, and the knocking force is increased and becomes heavier.

(Comparative Example 2)
FIG. 11 shows another example of a conventional feeding-type writing instrument that does not use the present invention as a diagram corresponding to FIG. This has a structure corresponding to Patent Document 2 described above.
In this conventional example, as a driving means for the lid 10, the tip end portion of the small diameter portion 2a of the writing instrument body 2 has a constant inclination angle with respect to the forward direction of the writing instrument body 2 (the direction of arrow A in the figure). An inclined surface 2i of 75 degrees is provided.
As the writing instrument main body 2 advances, the inclined surface 2i presses the inner cam portion 10d of the lid body 10, the inner cam portion 10d of the lid body 10 moves while sliding on the inclined surface 2i, and the lid body 10 is rotated. .
In the initial stage of rotation (see FIG. 11), the tangential direction (direction of arrow C in the figure) with respect to the rotation trajectory of the contact point (direction of arrow B in the figure) and the normal direction of the inclined surface 2i (direction of arrow D in the figure) ) Is greatly different from 80 degrees, and the force applied in the rotation direction becomes extremely small. Therefore, a large knocking force is applied in the initial stage of rotation of the lid 7.

Samples were prepared based on the above examples, and the knock load was measured using a digital force gauge ZP-20N manufactured by Imada Corporation. Moreover, the monitor test was done about knock power and a knock feeling.
The measurement results of the knock load are shown in Table 1 and graphs showing the knock load curve in FIGS. 12 to 16, and the results of the monitor test are shown in Table 2. FIG. 12 is a graph showing a knock load curve at the rotation angle of the lid in the first embodiment. FIG. 13 is a graph showing a knock load curve at the rotation angle of the lid in the second embodiment. FIG. 14 is a graph showing a knock load curve at the rotation angle of the lid in Example 3. FIG. 15 is a graph showing a knock load curve at the rotation angle of the lid in Comparative Example 1. FIG. 16 is a graph showing a knock load curve at the rotation angle of the lid in Comparative Example 2.
In Examples 1 to 3, the maximum knock load is lower than that of Comparative Examples 1 and 2, and the width of the knock force is suppressed to be small. As for Comparative Example 1 and Comparative Example 2, the knock force exceeds a knock load of 1 kgf, which makes the user feel uncomfortable when knocking. In addition, with respect to Examples 2 and 3, the initial load is suppressed as compared with Example 1, and it is possible to give a knocking feeling that does not feel an increase in the knocking force.

<Knock force monitor test>
Prepare each sample based on each of the above examples, have 20 monitors knock, and feel the knocking force either 1 point; heavy, 2 points; not heavy, 3 points; light I was evaluated by.

<Knock monitor test>
Prepare each sample based on each of the above examples, have 20 monitors knock, and feel the knocking feeling 1 point; feel the catch 2 points; feel no slight vibration but feel a slight vibration in the hand 3 points: It was evaluated as either a smooth knock feeling without being caught.

  As described above, the knocking of the comparative example is heavier than that of the example. Further, in the embodiment, by making the inclined surface into a curved surface, it is possible to eliminate a feeling of being caught when the lid body 10 is rotated and to obtain a smooth knock feeling.

DESCRIPTION OF SYMBOLS 1 Exterior body 1a Hole 1b Front-end opening part 2 Writing instrument main body 2a Small diameter part 2b Large diameter part 2c Shoulder part 2d Locking protrusion 2e Release protrusion 2f Inclined surface 2g Concave surface 2h Outward protrusion 2i Inclined surface 3 Pen tip 4 Occlusion body 5 Tail plug 6 Pen tip holder 7 Clip 8 Gear member 9 Coil spring 10 Lid 10a Lid 10b Rotating shaft 10c Side wall 10d Inner cam 10e Outer cam 10f Cam slope 10g Cam surface 11 O-ring 12 Ring member 13 Elastic Airtight member 13a Outer circumferential contact portion 13b Inner circumferential contact portion

Claims (1)

A writing instrument body having a pen tip at the tip is housed in the exterior body so as to be movable back and forth, and a lid for closing the tip opening of the exterior body is rotatably provided on the inner wall of the exterior body . with the advances the writing instrument body, causes opening of the distal end opening portion of the rotated with exterior body said lid, in feeding type writing instrument comprising by projecting nib from the tip opening of the package body in which the opening, The writing instrument body includes driving means that contacts an inward projection formed on the inner side of the lid body and transmits a forward movement of the writing instrument body to give a rotational movement to the lid body, and the driving means includes the writing instrument body. A feeding-type writing instrument that is a plurality of inclined surfaces with different angles or a concave curved inclined surface.

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