WO2006114846A1

WO2006114846A1 - Writing implement with cap

Info

Publication number: WO2006114846A1
Application number: PCT/JP2005/006943
Authority: WO
Inventors: Hideo Yamamoto
Original assignee: Gifu Service Co., Ltd.
Priority date: 2005-04-08
Filing date: 2005-04-08
Publication date: 2006-11-02
Also published as: JPWO2006109713A1; WO2006109713A1; JP4516117B2

Abstract

A writing implement with a cap, wherein a guide groove (15) spirally extending from a base end side to a tip side at an inclination angle of approximately 45° relative to the axial direction is formed in the outer peripheral surface of the guide part (12) of a body (10) within the angular range of approximately 360° in the peripheral direction of the guide part (12). The cap (20) is so formed that a first engagement projected part (21) and a second engagement projected part (22) allowed to fit to the guide groove (15) of the body (10) are integrally disposed at the base end and the tip of the guide groove (15) so as to correspond to the guide groove (15) of the body (10) and also disposed apart from each other through the distance of approximately 1/2 of the overall length of the guide groove (15). By moving the cap (20) relative to the body (10) while rotating, the writing implement can provide a unique aesthetic appearance or atmosphere while the cap (20) is moving, and the cap (20) can be smoothly moved and guided on the body (10).

Description

Specification

Writing instrument with cap

Technical field

The present invention relates to a writing instrument with a cap, such as a pencil, a ballpoint pen, and a fountain pen, for protecting a core and a pen tip with a cap, and more particularly to a writing instrument with a cap having an improved cap portion. Background art

Conventionally, a writing instrument with a cap comprises a main body having a core and a pen point, and a cap removably mounted on the main body, and the cap is attached to the main body during storage (when not in use). Cover the tip and protect it, and remove the cap when in use (when writing) to expose the lead and pen point. However, conventional capped writing instruments require the cap to be removed from the body during use, and the removed cap may be lost. Also, if the cap is lost, the lead and the pen point will always be exposed, and the lead and the pen point may be damaged. Therefore, as a writing instrument for preventing a pressing failure in advance, for example, there is a technique described in Patent Document 1.

Patent Document 1: Japanese Patent Application Laid-Open No. 2000-198294

[0003] In Patent Document 1, a cylindrical slide type cap is provided at the tip of a pencil, and the projection inside the cap is moved along the kerf of the pencil main body as a path, and the cap slides similarly. Such a capped pencil is disclosed. According to Patent Document 1, the capped pencil is capable of quickly opening and closing the cap, and is considered to be capable of preventing the cap from being lost and protecting the tip of the pencil.

Disclosure of the invention

Problem that invention tries to solve

However, the technology described in Patent Document 1 forms linear kerfs having opposite ends inclined in slightly opposite directions at positions facing 180 degrees in the circumferential direction of the outer peripheral surface of the pencil body. On the other hand, projections are respectively formed at positions (the same positions in the axial direction) where the slide type cap faces 180 degrees in the circumferential direction of the inner peripheral surface. Therefore, when moving the slide type cap, at the start of movement and at the end of movement, the protrusions are positioned at both ends of the kerf. Therefore, basically, the movement of the sliding cap is performed linearly with respect to the pencil body, although the sliding cap is slightly rotated counterclockwise or clockwise. Therefore, the movement of the sliding cap itself is performed in the same atmosphere as the movement of the cap of the conventional writing instrument with a cap. In addition, because one projection of the sliding cap moves linearly along one kerf of the pencil main body to move and guide the sliding cap, the thickness or diameter of the projection and the width of the kerf are set. If the dimensions are not precisely the same and the dimensions are the same, the width slide-type cap may shake during movement. Furthermore, since the pair of kerfs of the above configuration is formed on the outer peripheral surface of the pencil main body, the processing may be complicated.

Therefore, according to the present invention, by moving the cap while rotating with respect to the main body, the cap can be smoothly moved and guided with respect to the main body while exhibiting a unique aesthetic appearance or atmosphere when the cap is moved. The task is to provide a writing instrument with a cap. Means to solve the problem

A writing instrument with a cap according to claim 1 comprises: a main body having a writing part exposed from a tip, and the writing part in synchronization with the rotation by rotating a predetermined angle in the circumferential direction with respect to the main body. And a cap mounted for rotating and retracting to move to the exposed position from the covering position which completely covers and protects the writing part from the covering position to exposing the writing part.

A writing instrument with a cap according to claim 2 has a predetermined long portion on the tip end side as a substantially cylindrical guide portion and has a writing portion exposed to the tip force of the guide portion, and the outer peripheral surface of the guide portion A main body in which a guide groove extending in a spiral manner toward the tip end side of the proximal end side at a predetermined inclination angle with respect to the axial direction is formed, and the guide groove is formed in a predetermined angle range in the circumferential direction of the guide portion. A first engaging projection and a second engaging projection which can be inserted into the guiding groove of the main body respectively on the proximal end side and the distal end side of the guiding groove so as to correspond to the guiding groove of the main body A cap disposed integrally and spaced apart by a distance of about 1Z2 of the entire length of the guide groove and the first engagement projection and the second engagement projection; Attached to the guide of the main body with the first and second engagement projections inserted into the guide grooves of the main body Is, by rotating forward and backward direction with respect to the guide portion of the body, said body by said first and second engagement protruding portion is moved and guided along the guide groove of the body Axially advancing and retracting along the guide portion of the guide, and when the second engagement projection is disposed at the tip of the guide groove of the main body, the writing portion is completely covered and protected When the first engaging convex portion is disposed at the proximal end of the guide groove of the main body, the writing portion is exposed.

In the writing instrument with a cap according to claim 3, according to the configuration of claim 1 or 2, the cap is inclined at an inclination angle which is the same as the inclination angle of the guide groove of the main body with respect to the axial center. And the main body is inclined at the same angle as the sliding end face of the cap, and the elliptical sliding step surface is aligned with the sliding end face. When the cap is at the exposed position, the sliding contact end face of the cap aligns with and contacts the sliding step surface of the main body when the cap is at the exposed position, and the cap is rotated to move the exposed position. When advancing from the covering position to the covering position and when retracting the cap in the reverse direction to retract from the covering position to the exposed position, a part of the sliding contact end face of the cap is in sliding contact with the main body Always make sliding contact with the step surface, and the key in the guide groove of the main body The cap is fixed to the main body by cooperation of the movement guide of the first and second engagement convex portions of the cap and the slide contact guide of the sliding end face of the cap against the sliding step surface of the main body. It was planned to move within the proposal.

[0009] The writing instrument with a cap according to claim 4 has the configuration according to claim 2 or 3, wherein the guide groove of the main body is a first engagement convex as the cap rotates with respect to the guide portion of the main body. It has a spiral shape in which a first locus drawn by the part and a second locus drawn by the second engagement convex part with the rotation of the cap with respect to the guide part of the main body are connected.

[0010] In the writing instrument with a cap according to a fifth aspect, in the configuration according to any one of the second to fourth aspects, two guide grooves of the main body are formed parallel to each other on the outer peripheral surface of the guide portion. The first and second engagement projections are provided corresponding to the two guide grooves of the main body.

[0011] In the writing instrument with a cap according to a sixth aspect of the present invention, in the configuration according to any one of the second to fifth aspects, the cap further includes a first engaging convex portion and a second engaging convex portion. A third engagement protrusion and a fourth engagement protrusion are integrally disposed at a predetermined interval so as to correspond to the guide groove of the main body between. In the writing instrument with a cap according to a seventh aspect of the present invention, in the configuration according to any of the second, third, fifth and sixth aspects, the guide groove of the main body corresponds to the respective ones as the cap rotates with respect to the guide portion. In order to allow the engagement projections to pass through, the cover has a width that encompasses all the trajectories that the engagement projections draw as the cap rotates.

Effect of the invention

The writing instrument with a cap according to the present invention has a unique aesthetic appearance or atmosphere when moving the cap by moving the cap while rotating the cap relative to the main body, and the cap moves smoothly with respect to the main body. It can be guided. Furthermore, the provision of the guide groove also simplifies the welding.

Brief description of the drawings

[FIG. 1] FIG. 1 is a perspective view of the inner structure of a cap-equipped writing instrument according to a first embodiment of the present invention, showing the relationship between the guide groove of the main body and the engagement convex portion of the cap and the sliding end face of the main body It is a top view which shows the relationship between each and the sliding end face of a cap, respectively, (a) shows the state which made the cap the exposure position, (b) each shows the state which made the cap the coating position.

[FIG. 2] FIG. 2 sees through the internal structure of the writing instrument with a cap according to Embodiment 1 of the present invention, and shows the relationship between the guide groove of the main body and the engaging convex portion of the cap and the sliding end face of the main body and the cap FIG. 6A is a right side view showing the relationship with the sliding contact end face, FIG. 7A shows a state in which the cap is in the exposed position, and FIG. 7B shows a state in which the cap is in the covering position.

[FIG. 3] FIG. 3 is a perspective view of the inner structure of the cap-equipped writing instrument according to the first embodiment of the present invention, showing the relationship between the guide groove of the main body and the engaging convex portion of the cap and the sliding end face of the main body and the cap It is a perspective view which shows the relationship with a sliding contact end, respectively, (a) shows the state which made the cap the exposure position, (b) each shows the state which made the cap the coating position.

[FIG. 4] FIG. 4 is a plan view showing the relationship between the main body and the cap when moving the cap of the writing instrument with a cap according to Embodiment 1 of the present invention from the exposed position to the covered position. (D) shows a state in which the cap is in the covering position, and (b) and (c) show a state in the middle of reaching the covering position.

[FIG. 5] FIG. 5 is a right side view showing the relationship between the main body and the cap when the cap of the writing instrument with a cap according to Embodiment 1 of the present invention is moved from the exposed position to the covered position. Shows the state in which the cap is in the exposed position, (d) shows the state in which the cap is in the covering position, and (b) and (C) show the state in the middle of reaching the covering position to the covering position.

[FIG. 6] FIG. 6 is a perspective view showing the relationship between the main body and the cap when moving the cap of the writing instrument with a cap according to Embodiment 1 of the present invention from the exposed position to the covered position. (D) shows a state in which the cap is in the covering position, and (b) and (c) show a state in the middle of reaching the covering position.

[FIG. 7] FIG. 7 is a schematic view showing the relationship between the main body of the cap-equipped writing instrument according to Embodiment 1 of the present invention and the engagement convex portion of the cap by three-dimensional coordinates; The end face is represented in the xz plane, and (b) represents the engagement projection of the cap in the xy plane.

[FIG. 8] FIG. 8 is a schematic view showing the relationship between the sliding end face of the main body of the cap-equipped writing instrument according to Embodiment 1 of the present invention and the sliding end face of the cap in three dimensions; Represents the cap in the covering position in the xz plane, and (b) represents the cap in the exposed position in the xz plane.

[FIG. 9] FIG. 9 is a schematic view showing a locus of an engagement convex portion of a cap of a writing instrument with a cap according to Embodiment 1 of the present invention on an xz plane of three-dimensional coordinates.

[FIG. 10] FIG. 10 is a schematic view showing the locus of the engaging convex part of the cap of the writing instrument with a cap according to Embodiment 1 of the present invention, and FIG. b) is a view of the track portion as viewed from above, and (c) is a view of the track portion as viewed from below.

[FIG. 11] FIG. 11 is a schematic view showing the guide groove of the main body of the cap-equipped writing instrument according to the second embodiment of the present invention, where (a) is a view of the guide groove also viewed to the right; Is a view of the guide groove portion as viewed from above.

Explanation of sign

[0015] 10: main body, 11: support portion, 11a: sliding step surface, 12: guiding portion, 13: writing portion

15, 115: guide groove, 20: cap, 20a: sliding contact end face 21, 22, 22: engagement projection

BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, the best mode for carrying out the present invention (hereinafter, referred to as an embodiment) will be described.

Embodiment 1

First, the configuration of a writing instrument with a cap according to Embodiment 1 will be described with reference to FIGS. 1 to 3. Do. As shown in FIGS. 1 to 3, the capped writing instrument of Embodiment 1 includes a main body 10 and a cap 20. The main body 10 has a substantially cylindrical shape in which a substantially cylindrical guide portion 12 with a slightly smaller diameter at the tip end side is integrally formed at the tip of a substantially cylindrical support portion 11 with a slightly smaller diameter at the base end side. Further, the main body 10 has a writing unit 13 such as a lead or a pen point which also exposes the tip force of the guiding unit 12. As the writing unit, a pen point of a ballpoint pen, a pen point of a fountain pen, a pencil lead, etc. can be exemplified. That is, the writing instrument with a cap according to the embodiment 1 is a simple pencil used for writing the score of a golf course other than a normal ballpoint pen and a fountain pen (a pencil core fixed to the tip of a plastic main body) It can be made specific to Further, the guide portion 12 constitutes a predetermined long portion on the distal end side of the support portion 11 of the main body 10, and the guide groove 15 is formed on the outer peripheral surface (surface) of the substantially half portion (rear half portion) on the proximal end side. It is formed. The guide groove 15 has both a proximal force and a helical curvilinear force extending at an inclination angle of about 45 degrees with respect to the axial direction of the guide portion 12. The guide groove 15 is formed in an angular range of about 360 degrees in the circumferential direction of the guide portion 12. Further, the guide groove 15 is written from the lower center (lower center in the circumferential direction) to the lower center (lower center in the circumferential direction) from the lower center (lower center in the circumferential direction) to the lower center of the guide portion 12 It extends helically in a clockwise direction as viewed from the part 13. The spiral curve of the guiding groove 15 can be represented as a sine curve, a cycloid curve, or a curve approximating them. The length portion corresponding to the guide groove 15 of the guide portion 12 is substantially cylindrical.

On the other hand, the cap 20 of the guide groove 15 of the guide groove 15 corresponds to the guide groove 15 of the main body 10 with the first engagement convex portion 21 and the second engagement convex portion 22 freely engageable with the guide groove 15 of the main body 10. They are integrally arranged on the proximal end and the distal end, respectively. The first engagement convex portion 21 and the second engagement convex portion 22 have, for example, a small cylindrical shape which protrudes in the radial direction from the inner circumferential surface of the cap 20. Further, the first engagement convex portion 21 and the second engagement convex portion 22 are spaced apart at an interval of about 1Z2 of the entire length of the guide groove 15. Thereby, the first engagement convex portion 21 and the second engagement convex portion 22 are arranged at angular intervals of 180 degrees in the circumferential direction of the guide portion 12 corresponding to the angular range of the guide inner groove 15. ing. The cap 20 is mounted on the guide portion 12 of the main body 10 in a state where the first and second engagement protrusions 21 and 22 are respectively inserted into the guide grooves 15 of the main body 10. Then, the cap 20 in the forward and reverse directions with respect to the guide portion 12 of the main body 10 (clockwise direction and counterclockwise as viewed from the writing portion 13) The first and second engagement protrusions 21 and 22 are moved and guided along the guide groove 15 of the main body 10 by rotating in the rotating direction. Thus, the cap 20 can be advanced (moved to the tip end) and retracted (moved to the base end) in the axial direction along the guide portion 12 of the main body 10. Here, as shown in FIG. 1 (a), FIG. 2 (a) and FIG. 3 (a), the cap 20 arranges the first engagement convex portion 21 at the proximal end of the guide groove 15 of the main body 10. When it does, it becomes the exposure position where the tip 13 force is also exposed also writing section 13. At this time, the first engagement protrusion 21 is located at the proximal end of the guide groove 15, and the second engagement protrusion 22 is located at the center of the guide groove 15. On the other hand, as shown in FIG. 1 (b), FIG. 2 (b), and FIG. 3 (b), the cap 20 has the second engagement projection 22 disposed at the tip of the guide groove 15 of the main body 10. , The writing portion 13 is completely covered and protected from the tip to the covered position. At this time, the first engagement protrusion 21 is located at the center of the guide groove 15, and the second engagement protrusion 22 is located at the tip of the guide groove 15. The guide groove 15 is a portion between the proximal end and the distal end so that movement or sliding of the first engagement convex portion 21 and the second engagement convex portion 22 can be smoothly performed. A width slightly larger than the diameter of the convex portion 21 and the second engaging convex portion 22 and, at the proximal end and the distal end, the first engaging convex portion 21 and the second engaging convex portion 22 are elastic. For example, it has a width slightly smaller than the diameter of the first engagement convex portion 21 and the second engagement convex portion 22 so that it can be positioned and held by gripping or snap fitting or the like.

The cap 20 has an elliptical sliding contact end face 20a inclined at an inclination angle which is the same as the inclination angle of the guide groove 15 of the main body 10 with respect to the axial center, that is, about 45 degrees. . That is, the cap 20 has a sliding end face 20a having a shape obtained by cutting the base end of the cylinder at an angle of about 45 degrees with respect to the axis. On the other hand, the main body 10 is inclined at the same inclination angle (the inclination angle of about 45 degrees) as the sliding contact end face 20 a of the cap 20 and an elliptical sliding contact step surface 11 a aligned with the sliding contact end face 20 a At the distal end of the support portion 11. That is, the main body 10 makes the diameter of the support portion 11 slightly larger than the diameter of the guide portion 12 and is a step surface inclined at an angle of about 45 degrees with respect to the axial center at the boundary portion between the support portion 11 and the guide portion 12 A sliding contact step 1 la is formed. Then, when the cap 20 is at the exposed position, the sliding end face 20a of the cap 20 aligns with and comes into contact with the sliding step surface 11a of the main body 10, and rotates the cap 20 in the forward direction. When advancing to the position and when rotating the cap 20 in the reverse direction to retract from the covered position to the exposed position, A portion of the sliding end face 20a is always in sliding contact with the sliding step surface 1 la of the main body 10, and the movement guide of the first and second engaging projections 21, 22 of the cap 20 in the guide groove 15 of the main body 10 The cap 20 is moved and guided relative to the main body 10 in cooperation with the sliding contact guide of the sliding contact end face 20 a of the cap 20 with respect to the sliding contact step surface 11 a of the main body 10.

Next, the method of use and the operation and effects of the cap-equipped writing instrument according to the first embodiment will be described with reference to FIG. 4 to FIG. As shown in FIG. 4 (a), FIG. 5 (a) and FIG. 6 (a), the cap 20 is in the exposed position when in use. At this time, the elliptical sliding contact end face 20 a of the cap 20 abuts completely (in the range of 360 degrees) on the elliptical sliding contact step surface 11 a of the main body 10, and about 45 between the main body 10 and the cap 20. An inclined interface or joint surface is formed. From this state, when the cap 20 is rotated in the clockwise direction (positive rotation), the first and second engagement protrusions 21 and 22 are moved and guided along the guide groove 15 of the main body 10, The curved pointed portion (lower end of FIG. 5 (a)) of the sliding end face 20a is slidably guided on the sliding step surface 11a of the main body 10, and the cap 20 is shown in FIGS. 4 (b) and 5 (b). 6 (b) through FIG. 4 (c), FIG. 5 (c) and FIG. 6 (c), finally, FIG. 4 (d), FIG. 5 (d) and FIG. 6 (d). As shown in, it becomes the covering position. At this time, the curved tip of the sliding end face 20a of the cap 20 is in contact with the curved tip (the upper end of FIGS. 5A to 5D) of the elliptical sliding step surface 1 la of the main body 10. An open space of a unique shape is formed between the main body 10 and the cap 20 in an inverted V shape (when viewed from the side) which intersects at about 90 degrees. Here, the writing instrument with a cap according to the first embodiment can exhibit a unique aesthetic appearance or atmosphere when moving the cap 20 by moving the cap 20 while rotating the cap 20 with respect to the main body 10, so that a distinctive design The effect can be exhibited, and the movement guide of the first and second engaging convex portions 21 and 22 of the cap 20 by the guide groove 15 of the main body 10 and the sliding of the cap 20 by the sliding step surface 11 a of the main body 10 The cap 20 can be smoothly moved and guided relative to the main body 10 by cooperation with the sliding contact guide of the contact end face 20a, and the cap 20 does not shake during the movement guide. Furthermore, since the guide groove 15 of the main body 10 may be formed in the guide portion 12 in a spiral shape, its processing is simplified.

Next, in the writing instrument with a cap according to the first embodiment, a curved rotational locus drawn by the first and second engaging projections 21 and 22 as the cap 20 rotates and a guide groove of the main body 10 15 spirals The relationship with the curves will be described in detail with reference to FIGS. First, assuming that the boundary between the support portion 11 and the guide portion 12 of the main body 10 is a cylinder and represented in three-dimensional coordinates as shown in FIGS. 7 to 9, the surface of the cylinder has the following formula (1) It can be represented by

X + y = r, x = r cos θ, y = r sin θ) · · · (1)

However, χ is an axis extending in the vertical direction (vertical direction or a direction perpendicular to the sheet) of the main body 10 in the state of FIG. 1, y is an axis extending in the lateral direction (horizontal direction) of the main body 10 in the state of FIG. And z is an axis extending in the longitudinal direction of the main body 10 in the state of FIG.

Next, the plane which cuts the surface of the cylinder at 45 degrees can be expressed by the following equation (2), assuming that it passes through the origin.

x cos γ + y sin y + z = 0 (x = r cos θ, y = rs m θ J · · · (2)

However, the normal vector satisfies the following equation.

X ² + y = r ² , z = r (x = r cos y, y = r sin y, z = r)

0 0 0 0 0 0

Next, an ellipse (corresponding to the sliding step surface 11a) which is the outer peripheral edge of the cut surface (cut surface) when the surface of the cylinder is cut at 45 degrees is the following equation from the above equations (1) and (2) It is represented by (3).

x = rcos Θ, y = rsm θ, ζ = rcos (θ-γ) ... (...)

Further, the main body 10 of radius r can be expressed by the following equation (4) by substituting γ = π into the equation (3).

x = r cos Θ, y = rs m θ, z = r cos θ (4)

7 (a) shows the sliding contact step surface 11a of the main body 10, and FIG. 7 (b) shows the tip of the sliding contact step surface 11a of the main body 10 (a base end to a second end of the sliding contact end face 20a of the cap 20). The positional relationship between the base end (corresponding to the position of the engaging projection 22) and the base end (corresponding to the tip of the sliding end face 20a of the cap 20 to the position of the first engaging projection 21) is shown.

On the other hand, the cap 20 moves in the initial state (covering position) shown in FIG. 8A because the elliptical section of the cut (sliding end face 20a) rotates and moves while changing the angle. (Sliding step surface 11a) substitutes γ = 0 into equation (3), and further shifts the center of the elliptical cross section (sliding step surface 1 la) of body 10 from the origin by 2r in the z-axis direction, It is represented by the following equation (5).

x = rcos Θ, y = rsm θ, ζ = rcos θ + 2 + · · · (5)

Further, the final state (exposure position) of the cap 20 shown in FIG. 8 (b) corresponds to the state of the above-mentioned equation (4). Since it corresponds, it can represent by Formula (4).

And, in the intermediate state between the initial state and the final state of the cap 20, the angle at which the tip of the cap 20 is rotated is γ, and the center of the elliptical end face deviates from the origin and the deviation changes with γ. Assuming that the deviation is ί (γ), the cap 20 can be expressed by the following equation (6) using the equation (3).

x = r cos Θ, y = rs m θ, ζ = − r cos (θ− γ) + f (γ) (6)

However, 0 <= γ <= 180 ° (cap 20 rotation parameter)

The equation representing the coincidence of the contact point between the main body 10 represented by the equation (4) and the cap 20 represented by the equation (5) and the equation force representing the coincidence of the slope of the tangent line Calculated, cap 20 can be expressed as equation (7) below.

x = r cos Θ, y = rs m θ, ζ = −r cos (θ−γ) +2 r cos γ / 2 (0 <= γ <= 180) ••• (7)

Since the case of θ = γ in the equation (7) represents the tip of the cap 20 (first engagement convex portion 21), the tip of the cap 20 can be represented by the following equation (8).

x = r cos Θ, y = r sin 0, z = -r + 2 r cos γ / 2 (0 <= γ = = 180 °) (8) Moving this with 0 0 = γ = = 180 °, the base of cap 20 Since it becomes the locus of the first engaging convex part 21 attached to the end, the locus of the first engaging convex part 21 is a function of X and して by eliminating γ from X and において in the equation (8) Can be represented by the following equation (9).

x = l / 2r (z + r) ² -r --- (9)

On the other hand, since the case where θ = γ + 180 ° in the equation (7) represents the base end of the cap 20 (the second engagement convex portion 22), the base end of the cap 20 is represented by the following equation (10). be able to. x =-r cos γ, y =-rs my, z = r + 2 r cos γ / 2 (0 <= γ, = 180) ... (10) If this is moved by 0 = γ = 180 °, the cap 20 group Since it becomes the locus of the second engaging convex part 22 attached to the end, the locus of the second engaging convex part 22 is a function of X and して by eliminating γ from X and において in equation (10) Can be expressed by the following equation (11).

x =-1 / 2r (zr) ² + r --- (11)

FIG. 10 shows these trajectories as viewed from the side of the body 10 and the cap 20. That is, the locus of the first engagement convex part 21 and the locus of the second engagement convex part 22 do not have the same locus, and in FIG. As shown, it does not connect smoothly, but crosses at a slight angle.

Therefore, in the first embodiment, the guide groove 15 of the main body 10 has a first locus drawn by the first engagement projection 21 as the cap 20 rotates with respect to the guide 12 of the main body 10, A shape having a spiral shape in which the second engagement convex portion 22 draws a second locus along the rotation of the cap 20 with respect to the guide portion 12 of the main body 10, that is, a spiral curve as shown in FIG. Is preferred. In this way, the first and second engagement projections 21 and 22 of the cap 20 in the guide groove 15 of the main body 10 can be moved more smoothly.

Second Embodiment

As shown in FIG. 11, the writing instrument with a cap according to the second embodiment has two guide grooves 115 formed parallel to each other on the outer peripheral surface of the guide portion 12 of the main body 10. In addition, the cap 20 is provided with the first engagement convex portion 21 and the second engagement convex portion 22 corresponding to the two guide grooves 115 of the main body 10 respectively. In FIG. 11, the black circles indicate the positions of the first and second engagement projections 21 and 22 which can be placed at the exposed position of the cap 20, and the white circles indicate the position of the second engagement convex 22 which is located at the covering position of the cap 20. Indicates the position. In this case, the movement guide of the first and second engagement projections 21 and 22 of the pair of the cap 20 by the two guide grooves 115 of the main body 10 and the cap 20 of the sliding contact step surface 11 a of the main body 10. By cooperating with the sliding contact guide of the sliding contact end face 20a, the cap 20 can be smoothly moved and guided relative to the main body 10, and the movement of the cap 20 at the moving guide can be more effectively prevented. can do.

By the way, the writing instrument with a cap according to the present invention has the writing unit exposed completely from the tip and the writing unit completely rotated in synchronization with the rotation by rotating a predetermined angle in the circumferential direction with respect to the main unit. Covering position force for covering and protecting the cover, provided that it has a cap mounted so as to move backward to the exposed position while rotating to the exposed position exposing the writing unit, except for the configuration of each embodiment described above It can be embodied in any configuration. Further, in each of the above embodiments, the cap 20 is further fixed to correspond to the guide grooves 15 and 115 of the main body 10 between the first engagement convex portion 21 and the second engagement convex portion 22. It may also be configured to have a third engagement protrusion and a fourth engagement protrusion arranged integrally at intervals. Furthermore, the guide grooves 15 and 115 of the main body 10 are engaged with the engaging convex portions 21 and 22 with the rotation of the cap 20 so that the engaging convex portions 21 and 22 can pass with the rotation of the cap 20 with respect to the guiding portion 12. All 22 draws It can also be configured to have a width that encompasses the trajectory of the subject.

Further, in the writing instrument with a cap according to the present invention, the guide groove is not limited to the configuration of each of the above embodiments, but from the proximal end side to the distal end side at a predetermined inclination angle with respect to the axial direction of the guide portion 12 It is also possible to use a spiral curve which is inclined at an angle different from the inclination angle (about 45 degrees) of the first embodiment, as long as the spirally extending spiral force is formed. Furthermore, the angle range in which the guide groove 12 is provided in the guide portion 12 of the main body 10 can also be any angle range other than the angle range (about 360 degrees) of the first embodiment. However, providing the guide groove in the guide portion 12 of the main body 10 at an angle range of at least 180 degrees, from the viewpoint of improving the feeling of operation when the cap 20 is rotationally moved between the covering position and the exposed position. preferable. In addition, in the cap-equipped brush writing tool according to the present invention, only one engagement convex portion may be provided on the cap.

Industrial applicability

The writing instrument with a cap according to the present invention is not only a writing instrument having a cap, such as a ballpoint pen, a fountain pen, etc., but also a simple pencil having a tip of pencil or the like of the main body made of plastic etc. The present invention can also be applied to a writing instrument in which the cap as described above is attached to the main body of the device that does not have a mark, and to a writing instrument for various uses.

Claims

The scope of the claims

[1] A main body having a writing part exposed from the tip,

With respect to the main body, by rotating by a predetermined angle in the circumferential direction, in synchronization with the rotation, it retracts while rotating from the covering position where the writing part is completely covered and protected to the exposing position where the writing part is exposed. And a cap mounted so as to move to the exposed position.

[2] A predetermined long portion on the tip end side is a substantially cylindrical guide portion, and has a writing portion that exposes the tip force of the guide portion, and the outer peripheral surface of the guide portion is predetermined in the axial direction. A main body in which a guide groove extending in a spiral form from the proximal end side to the distal end side at an inclination angle is formed, and the guide groove is formed in a predetermined angular range in the circumferential direction of the guide portion;

The first and second engagement protrusions, which can be inserted into the guide grooves of the main body, are integrated with the proximal end and the distal end of the guide grooves so as to correspond to the guide grooves of the main body. And a cap having the first engagement protrusion and the second engagement protrusion spaced apart by about 1 Z2 of the entire length of the guide groove,

The cap is attached to the guide of the main body in a state where the first and second engagement protrusions are respectively inserted into the guide grooves of the main body, and the cap rotates in the forward and reverse directions with respect to the guide of the main body. As a result, the first and second engagement protrusions can be axially advanced and retracted along the guide of the main body by being moved and guided along the guide groove of the main body, When the second engagement convex portion is disposed at the tip of the guide groove of the main body, a covering position for completely covering and protecting the writing portion is obtained, and the first engagement convex portion is fixed to the main body. When it arrange | positions at the base end of the guide groove of this, it becomes an exposure position which exposes the said writing part. The writing instrument with a cap characterized by the above-mentioned.

[3] The cap has an elliptical sliding contact end surface inclined at the same inclination angle as the inclination angle of the guide groove of the main body with respect to the axial center, at the base end.

The main body has an elliptical sliding contact step surface which is inclined at the same inclination angle as the sliding contact end face of the cap and aligned with the sliding contact end face, at the proximal end of the guide portion.

When the cap is in the exposed position, the sliding contact end face of the cap aligns with and contacts the sliding step surface of the main body, and the cap is rotated to cover the covering position from the exposed position. When advancing to the mounting position, and when the cap is reversely rotated to retract from the covering position to the exposed position, a part of the sliding contact end face of the cap is the sliding contact surface of the main body. The sliding guide of the first and second engaging convex portions of the cap in the guiding groove of the main body, and the sliding guide of the sliding end face of the cap against the sliding step surface of the main body; The cap-equipped writing instrument according to claim 2, wherein the cap is moved and guided relative to the main body by the cooperation of the two.

[4] The guide groove of the main body is a first locus drawn by a first engagement convex portion with the rotation of the cap with respect to the guide portion of the main body, and a first trajectory with the rotation of the cap with respect to the guide portion of the main body. The writing instrument with a cap according to claim 2 or 3, characterized in that it has a spiral shape in which it is connected with a second locus drawn by two engaging convex parts.

[5] Two guide grooves of the main body are formed parallel to each other on the outer peripheral surface of the guide portion, and the first and second engagement projections of the cap correspond to both guide grooves of the main body. The writing instrument with a cap according to any one of claims 2 to 4, characterized in that each is provided.

[6] The cap is further integrally disposed at a predetermined interval between the first engagement convex portion and the second engagement convex portion so as to correspond to the guide groove of the main body. A writing instrument with a cap according to any one of claims 2 to 5, characterized in that it has an engagement convex portion 3 and a fourth engagement convex portion.

[7] The guide groove of the main body has all the trajectories drawn by the engagement convex portions as the cap rotates so that the engagement convex portions can pass as the cap rotates with respect to the guide portion. The brush-equipped writing instrument according to any one of claims 2, 3, 5 and 6, which has a width to be included.