JP2008110527A - Retractable writing utensil - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a retractable writing utensil, which raises no fear for damaging a pen point at the retraction and extension of the pen point and for staining the neighborhood of the pen point of a writing body in ink and, in addition, suppresses an increase in the number of parts, and is provided inexpensively. <P>SOLUTION: A writing body 3 with the pen point 31 at its front end is axially movably housed within a barrel 2. The pen point 31 is so constituted as to freely extend to and retracted from through the front end hole 21 of the barrel 2. A lid body 5 with a spherical sealing part 51 on its outer surface is pivotally provided within the front end part of the barrel 2. The inner surface of the lid body 5 has an inside cam part 6. An outside cam part 4 slidingly contactable with the inside cam part 6 is formed on the outer surface of the pen-point retaining part of the writing body 3. By slidingly contacting the inside cam part 6 and the outside cam part 4 with each other in a pen point extending process and in a pen point retracting process, the lid body 5 is pivoted so as to open and close the front end hole 21. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

The present invention relates to a retractable writing instrument. Specifically, a lid body having a spherical seal portion is rotatably provided inside the front end portion of the shaft cylinder, and the lid body closes the front end hole when the pen tip is immersed, and the lid body is the front end hole when the pen tip protrudes. It is related to the haunting type writing instrument which opens.

Conventionally, Patent Document 1 discloses a retractable writing instrument in which a rotary stopper is rotatably arranged inside a front end of a shaft cylinder, and the front end opening is opened and closed when the pen tip is retracted.

Patent Document 2 discloses a retractable writing instrument in which a link for rotating the ball-shaped door is provided between the ball-shaped door and the cartridge inside the shaft cylinder.

Japanese Utility Model Publication No. 6-15728 JP 2005-246971 A

However, when the rotary plug body is changed from the closed state of the front end opening to the open state, the retractable writing instrument of Patent Document 1 has a structure in which the pen body is applied to the rotation auxiliary rod of the rotary plug body and the rotary plug body is rotated. . For this reason, the pen body may be damaged, or the ink adhering to the rotation auxiliary rod may adhere to the vicinity of the refill pen body, and the vicinity of the refill pen body may be soiled with ink.

In addition, since the retractable writing instrument of Patent Document 2 has a link between the ball-shaped door and the cartridge, the number of parts increases, the assembly becomes complicated, and it is difficult to provide at low cost.

The present invention solves the above-mentioned conventional problems, and there is no risk of damaging the pen tip when the pen tip moves in and out, or smearing the vicinity of the pen tip of the writing body with ink, and increasing the number of parts Therefore, it is intended to provide an intrusive writing instrument that can be provided at low cost.

In the first invention of the present application, the writing body 3 holding the pen tip 31 at the front end is accommodated in the shaft tube 2 so as to be movable in the axial direction, and the pen tip 31 can be projected and retracted from the front end hole 21 of the shaft tube 2. The lid body 5 having a spherical seal portion 51 on the outer surface is rotatably provided inside the front end portion of the shaft cylinder 2, and the elastic body 7 that biases the lid body 5 forward is provided inside the shaft cylinder 2. When the pen tip is immersed, the front end hole 21 is closed by bringing the spherical seal portion 51 of the lid 5 into close contact with the front end hole 21, and when the pen tip protrudes, the spherical seal portion 51 of the lid 5 A retractable writing instrument in which the front end hole 21 is opened by releasing the close contact with the front end hole 21, wherein an inner cam portion 6 is formed on the inner surface of the lid 5, and the pen tip holding portion of the writing body 3 The outer cam portion 4 is formed on the outer surface of the pen tip so as to be in sliding contact with the inner cam portion 6. In the process, the inner cam portion 6 and the outer cam portion 4 are brought into sliding contact with each other, thereby rotating the lid body 5 to open the front end hole 21 and from the pen tip protruding state to the pen tip immersed state. In the process, the inner cam portion 6 and the outer cam portion 4 are brought into sliding contact with each other, whereby the lid body 5 is rotated and the front end hole 21 is closed.

The retractable writing instrument 1 according to the first aspect of the present invention has an outer cam portion 4 slidable in contact with the inner cam portion 6 on the outer surface of the pen tip holding portion of the writing body 3, so that the pen tip 31 is retracted when the pen tip is retracted. Can be prevented from coming into contact with the lid 5, and the pen tip 31 can be prevented from being damaged when the pen tip moves in and out, and the vicinity of the pen tip 31 of the writing body 3 can be prevented from being stained with ink.

The retractable writing instrument 1 according to the first aspect of the present invention has an inner cam portion 6 formed on the inner surface of the lid 5 and can slide on the inner cam portion 6 on the outer surface of the pen tip holding portion of the writing body 3. The outer cam portion 4 is formed, and the lid body 5 is turned in the process of shifting from the pen-tip immersion state to the pen-tip protruding state, and the cover body 5 is rotated in the process of shifting from the pen-tip protruding state to the pen tip immersion state. A part for rotating the lid body 5 is arranged between the writing body 3 and the lid body 5 by performing both of the operation movements by sliding contact between the inner cam portion 6 and the outer cam portion 4. Therefore, the number of parts can be reduced, the assembling is simplified, and it can be provided at a low cost.

According to a second invention of the present application, in the first invention, the inner cam portion 6 includes a first cam portion 61 and a second cam portion 62, and the outer cam portion 4 is the first cam portion 61. A first slidable contact portion 41 slidably contactable with the second cam portion 62 and a second slidable contact portion 42 slidably contactable with the second cam portion 62. In the process of rotating the lid 5 by opening the front end hole 21 by sliding the 1 cam portion 61 and the first sliding contact portion 41, the pen tip protruding state to the pen tip immersing state, The front end hole 21 is closed by rotating the lid 5 by bringing the second cam portion 62 and the second sliding contact portion 42 into sliding contact with each other.

The retractable writing instrument 1 according to the second aspect of the invention has a process of changing from the pen tip immersive state to the pen tip protruding state (ie, the pen tip protruding process) and a step of changing the pen tip protruding state to the pen tip immersive state (ie, the pen tip immersing state). In the process), the sliding contact positions of the inner cam portion 6 and the outer cam portion 4 are different. Thereby, it becomes unnecessary to form the shapes of the inner cam portion 6 and the outer cam portion 4 with high accuracy, the manufacturing becomes easy, and the occurrence of malfunction of the lid 5 due to manufacturing variations can be suppressed.

According to a third invention of the present application, in the second invention, the inner cam portion 6 is formed of a protruding portion integrally formed on the inner surface of the lid 5, and the first cam is formed on the peripheral surface of the inner cam portion 6. A portion 61 and the second cam portion 62 are formed.

The retractable writing instrument 1 of the third invention can easily form the inner cam portion 6 on the inner surface of the lid 5. For example, the retractable writing instrument 1 of the third aspect of the invention can easily form the inner cam portion 6 on the inner surface of the lid 5 by integral molding of synthetic resin.

According to a fourth invention of the present application, in any one of the second to third inventions, the outer cam portion 4 includes an inclined wall portion that is integrally formed on the outer surface of the writing body 3 and is inclined with respect to the axis. It is characterized by comprising one sliding contact portion 41 and a second sliding contact portion 42 formed of a protrusion integrally formed at a position slightly separated from the first sliding contact portion 41 on the outer surface of the writing body 3.

The retractable writing instrument 1 of the fourth invention can easily form the outer cam portion 4 on the outer surface of the writing body 3. For example, the retractable writing instrument 1 of the fourth invention can easily form the outer cam portion 4 on the outer surface of the writing body 3 by integral molding of synthetic resin.

According to a fifth invention of the present application, in any of the first to fourth inventions, a pair of the inner cam portions 6 are formed at symmetrical positions on the inner surface of the lid body 5, and the outer cam portions 4 are formed. A pair is formed at symmetrical positions on both sides of the outer surface of the pen point holding portion of the writing body 3.

In the retractable writing instrument 1 according to the fifth aspect of the invention, stable rotation of the lid 5 is obtained.

The sixth invention of the present application is characterized in that, in any one of the first to fifth inventions, the outer cam portion 4 is formed on the outer surface of the front end portion of the pen tip holding portion of the writing body 3.

The retractable writing instrument 1 according to the sixth aspect of the invention can set the movement amount (pen tip moving stroke) in the axial direction of the pen tip 31 from the pen tip immersive state to the pen tip protruding state as small as possible. Thereby, the operation of the pen tip 31 is facilitated. For example, in the case of the rear end knock type, the pen tip appearance operation is an operation of pressing the rear end knock body 26 forward, and in the case of the rotary type, it is a rotation operation of the operation unit. Furthermore, the retractable writing instrument 1 according to the sixth aspect of the present invention is further provided such that the front end of the outer cam portion 4 (the front end outer surface of the second sliding contact portion 42) and the front end surface of the pen tip holding portion are substantially aligned. It is preferable in that the pen tip movement stroke can be set small.

Further, the retractable writing instrument 1 of the sixth invention can set the outer diameter of the lid 5 as small as possible. As a result, the outer diameter of the shaft cylinder 2 that accommodates the lid 5 can be reduced, and the slender slim The shaft cylinder 2 having the appearance is obtained.

According to a seventh aspect of the present invention, in any one of the second to sixth aspects, the first cam portion 61 and the first sliding contact portion 41 are in the process of changing from the pen tip immersion state to the pen tip protruding state. In the process of bringing the second cam portion 62 and the second sliding contact portion 42 into a non-sliding contact state from the pen tip protruding state to the pen tip immersion state, the second cam portion 62 And the second sliding contact portion 42 are brought into sliding contact with each other, and the first cam portion 61 and the first sliding contact portion 41 are brought into a non-sliding contact state.

In the retractable writing instrument 1 according to the seventh aspect of the invention, the second cam portion 62 and the second sliding contact portion 42 are in the process of changing from the pen tip immersion state to the pen tip protruding state (that is, the process of opening the front end hole 21). In the process of changing the pen tip protruding state to the pen tip immersion state (that is, the process of closing the front end hole 21) without hindering the sliding contact between the first cam portion 61 and the first sliding contact portion 41, the first cam portion 61 and the first sliding contact portion 41 do not hinder the sliding contact between the second cam portion 62 and the second sliding contact portion 42. As a result, an appropriate sliding contact between the first cam portion 61 and the first sliding contact portion 41 is obtained in the process of changing from the pen tip immersion state to the pen tip protruding state, and the pen tip protruding state is changed from the pen tip protruding state. In the process, the proper sliding contact between the second cam portion 62 and the second sliding contact portion 42 is obtained.

The eighth invention of the present application is characterized in that, in any one of the first to seventh inventions, the outer cam portion 4 is positioned forward of the inner cam portion 6 in a pen tip protruding state. Specifically, in the eighth invention of the present application, the first slidable contact portion 41 is positioned in front of the first cam portion 61 in the pen tip protruding state, and the second slidable contact portion 42 is the second cam. It is characterized by being positioned in front of the part 62.

The retractable writing instrument 1 according to the eighth aspect of the present invention is in a pen tip protruding state, and the outer cam portion 4 and the inner cam portion 6 are in a non-sliding contact state. Therefore, the retractable writing instrument 1 according to the eighth aspect of the present invention releases the sliding contact state between the first cam portion 61 and the first sliding contact portion 41 in the process of changing the pen tip immersion state to the pen tip protruding state. It is possible to prevent the body 5 from rotating excessively and to prevent the pen tip 31 from coming into contact with the lid 5. The retractable writing instrument 1 according to the eighth aspect of the invention includes the second cam portion 62 and the second sliding contact portion with the pen tip 31 fully retracted in the process of changing from the pen tip protruding state to the pen tip retracted state. Since the sliding contact with 42 is started and the rotation of the lid body 5 is started, the pen tip 31 can be prevented from coming into contact with the lid body 5.

According to a ninth invention of the present application, in any one of the first to eighth inventions, the outer shaft portion 52 is provided at a symmetric position on both sides of the outer surface of the lid body 5, and the symmetric position on both sides of the inner surface of the front end portion of the shaft cylinder 2 is provided. The inner shaft portion 23 that can be engaged with the outer shaft portion 52 is provided, the outer shaft portion 52 or the inner shaft portion 23 is recessed, and the recessed outer shaft portion 52 or the inner shaft portion 23 is provided. The first restriction wall 52a for restricting the rotation of the lid 5 in the opening direction of the front end hole 21 and the second restriction wall 52b for restricting the rotation of the lid 5 in the closing direction of the front end hole 21 are provided. The lid body 5 is configured to be rotatable within a predetermined range by engaging the outer shaft portion 52 and the inner shaft portion 23.

The retractable writing instrument 1 according to the ninth aspect of the invention can properly engage the outer shaft portion 52 of the lid body 5 with the inner shaft portion 23 of the shaft cylinder 2. Easy and reliable assembly is possible.

According to the retractable writing instrument of the present invention, there is no possibility of damaging the pen tip when the pen tip appears and disappears, and the vicinity of the pen tip of the writing body is not stained with ink, and the increase in the number of parts is suppressed and provided at a low cost. It becomes possible.

1 to 15 show an embodiment of a retractable writing instrument according to the present invention.
The retractable writing instrument 1 according to the present embodiment includes a writing body 3 having a pen tip 31 at a front end, a shaft cylinder 2 that houses the writing body 3 therein, and a lid that opens and closes a front end hole 21 of the shaft cylinder 2. A body 5 and a projecting body 7 that urges the lid 5 forward and urges the writing body 3 backward are provided.

The shaft cylinder 2 is formed in a cylindrical shape and is obtained by molding a synthetic resin. A clip is provided on the outer surface of the rear side wall of the shaft cylinder 2. A knock body 26 projects from the rear end of the shaft tube 2.

In the shaft cylinder 2, an in / out mechanism (not shown) that makes the pen tip 31 of the writing body 3 in and out by an external operation is provided. In the present embodiment, a knock-type retracting mechanism in which the pen tip protruding operation is a forward pressing operation of the knock body 26 is employed. Specifically, a double-knock type retracting mechanism is employed in which both the pen tip protruding operation and the pen tip retracting operation are performed by pressing the knock body 26. In addition, the knock-type intrusion mechanism in which the pen tip protruding operation is a forward pressing operation of the knock body 26, in addition to this, the pen tip retracting operation lifts the shaft cylinder side wall clip radially outward, It may be a type in which a clip or release button on the side wall of the shaft cylinder is pressed inward in the radial direction.

A front end hole 21 is provided in the front end of the first seal portion shaft tube 2 in the axial direction. Through the front end hole 21, the nib 31 of the cursive body 3 appears and disappears. A first seal portion 22 made of an annular protrusion is formed on the inner surface of the front end hole 21. The lid 5 is in close contact with the first seal portion 22. The first seal part 22 is formed of an elastic material. The first seal portion 22 made of the elastic material is preferably obtained by simultaneous molding (two-color molding) when the shaft tube 2 is formed, because it is easy to manufacture. It can also be obtained by attaching an annular part made of

Inner shaft portion An inner shaft portion 23 made of a rib extending in the axial direction is integrally formed on the inner surface of the tapered front end portion of the shaft tube 2. A pair of the inner shaft portions 23 is formed on the inner surface of the front end portion of the shaft tube 2 at symmetrical positions with respect to the axis.

A first annular protrusion 24 is integrally formed on the inner surface behind the inner shaft portion 23 at the front end portion of the shaft tube 2. Further, a second annular protrusion 25 is integrally formed on the inner surface of the shaft cylinder 2 behind the first annular protrusion 24. The spring seat member 71 is moved over and locked to the first annular protrusion 24 from behind, thereby preventing the lid 5 from falling off from the inside of the front end portion of the shaft tube 2. Further, when the pen tip 31 is immersed and the front end hole 21 is closed, the second seal portion 33 on the outer surface of the writing body 3 is in close contact with the second annular protrusion 25 in an annular shape. In the present embodiment, an annular elastic body is fixed to the outer surface of the writing body 3 and the second seal portion 33 is provided in order to obtain a reliable close contact between the outer surface of the writing body 3 and the inner surface of the shaft tube 2. However, besides this, in the present invention, it is also possible to fix the annular elastic body to the inner surface of the shaft tube 2 and provide the second seal portion.

-Cursive body The cursive body 3 includes a container 32 containing ink therein and a pen tip 31 attached to the front end of the container 32. In the present embodiment, the pen tip 31 is a pen body made of a fiber processed body or a porous body. In the present invention, the pen tip 31 is not limited to this, for example, a ballpoint pen tip, a pen body made of a plastic extrusion, a metal plate pen body having a notch slit at the front end, a brush pen body, etc. It may be.

In the present embodiment, the container 32 is formed in a cylindrical shape and is obtained by molding a synthetic resin. The container 32 includes a small-diameter portion 32b and a large-diameter portion 32a integrally connected to the rear of the small-diameter portion 32b. The front end of the small diameter portion 32b is opened, and the rear end of the large diameter portion 32a is closed. An ink storage body impregnated with ink is accommodated in the large-diameter portion 32a, and a pen tip 31 is press-fitted and fixed to the front end opening of the small-diameter portion 32b. The nib 31 is connected to the ink occlusion body directly or via an ink guiding member.

An air hole 34 for taking outside air into the container 32 is opened on the outer surface of the front end portion of the writing body 3 (that is, the outer surface of the small diameter portion 32 b). In the present embodiment, the air hole 34 is opened in the side wall of the small-diameter portion 32b. Alternatively, the air hole 34 can be provided between the inner surface of the front end opening portion of the small-diameter portion 32b and the outer surface of the pen tip 31.

Moreover, in this Embodiment, the type (so-called batting type) which accommodates the ink occlusion body which impregnated the ink in the container 32 was employ | adopted as the writing body 3, However, In this invention, in the inside of the container 32 besides this. A type that directly contains ink (so-called direct liquid type) can also be adopted.

In the present embodiment, the front end portion (that is, the small diameter portion 32b) of the container 3 serves as a pen tip holding portion. In addition to this, in the present invention, the pen point holding part is integrally formed on the outer surface of the pen point holding member that holds the pen point 31 and is fixed to the front end opening of the container 32 and that is a separate part from the container 3. The structure to provide may be sufficient. That is, in the present invention, the outer surface of the pen tip holding portion refers to the front outer surface of the writing body 3 behind the protruding portion of the pen tip 31.

Second seal portion An annular elastic body is fixed to the outer surface of the front end portion of the large-diameter portion 32a of the container 32, and a second seal portion 33 is provided. The second seal portion 33 is in close contact with the inner surface of the shaft tube 2 in an annular shape at least when the pen tip is immersed. As a result, when the pen tip is immersed, the front end hole 21 is closed, and at the same time, the second seal portion 33 is annularly brought into close contact with the second annular protrusion 25 on the inner surface of the shaft tube 2. The second seal portion 33 is an annular member made of an elastic material, and is preferably obtained by simultaneous molding (two-color molding) when the container 32 is molded. It can also be obtained by attaching an annular member made of an elastic material.

In the present embodiment, an annular elastic body is fixed to the outer surface of the writing body 3 in order to obtain a reliable close contact between the outer surface of the writing body 3 and the inner surface of the shaft tube 2. Two seal portions 33 are formed. In the present invention, instead of fixing the annular elastic body to the outer surface of the writing body 3, it is also possible to fix the annular elastic body to the inner surface of the shaft tube 2 and form the second seal portion 33 on the inner surface of the shaft tube 2. It is. The annular elastic body fixed to the inner surface of the shaft tube 2 is preferably obtained by simultaneous molding (two-color molding) when the shaft tube 2 is molded. It can also be obtained by attaching an annular elastic body.

Outer cam part The outer cam part 4 is integrally formed on the outer surface of the front end part of the pen tip holding part. A pair of the outer cam portions 4 are formed at symmetrical positions with respect to the axis of the outer surface of the front end portion of the pen tip holding portion. The outer cam portion 4 moves in the axial direction as the writing body 3 moves in the axial direction (that is, movement of the pen tip 31 in the axial direction).

The outer cam portion 4 includes a first sliding contact portion 41 and a second sliding contact portion 42. The first sliding contact portion 41 includes an inclined wall portion that is inclined with respect to the axis of the writing body 3. The inclined wall portion is formed by a notch. The second sliding contact portion 42 is formed of a pin-shaped (specifically, columnar) protrusion. The second slidable contact portion 42 is formed at a position away from the rear end of the first slidable contact portion 41 made of the inclined wall portion. A gap is formed between the first sliding contact portion 41 and the second sliding contact portion 42. The width of the gap is set to be greater than the maximum distance between the first cam portion 61 and the second cam portion 62 of the inner cam portion 6 of the lid 5 (that is, the maximum thickness of the inner cam portion 6). Thereby, the inner cam portion 6 is configured to be able to pass through a gap between the first sliding contact portion 41 and the second sliding contact portion 42.

The lid body 5 has a spherical outer surface as a whole, and is obtained by molding a synthetic resin. The lid 5 is composed of a bottom wall portion formed at one end and two side wall portions integrally connected to the bottom wall portion. A through groove 53 is formed between the two side wall portions, and the through groove 53 is opened on the opposite side of the bottom wall portion of the lid 5. On the outer surface of the bottom wall portion, a spherical seal portion 51 that can be in close contact with the first seal portion 22 in an annular shape is formed.

The inner cam portion 6 formed of an elongated protrusion is integrally formed on the inner surface of the inner cam portion lid 5 facing the side wall portion. A pair of the inner cam portions 6 are formed at symmetrical positions on both sides of the inner surfaces of the two side wall portions. The inner cam portion 6 includes a first cam portion 61 formed on the opposite side of the bottom wall portion of the outer peripheral surface of the protruding portion, and a second cam portion 62 formed on the bottom wall portion side of the outer peripheral surface of the protruding portion. Consists of. The first cam portion 61 has a shape that bulges in an arc shape, and the second cam portion 62 has a shape that bulges in a substantially square shape. The first cam portion 61 and the first sliding contact portion 41, and the second cam portion 62 and the second sliding contact portion 42 are set to be in point contact or line contact with each other so that smooth sliding contact is possible. .

Outer shaft portion An outer shaft portion 52 is recessed on the outer surface of the two side wall portions. A pair of the outer shaft portions 52 is formed at symmetrical positions on both sides of the outer surface of the lid 5. The inner shaft portion 23 on the inner surface of the shaft cylinder 2 is engaged with the outer shaft portion 52. The outer shaft portion 52 includes a first restricting wall portion 52a and a second restricting wall portion 52b arranged so as to form an angle of approximately 90 degrees. The side wall of the inner shaft portion 23 made of the rib comes into contact with the first restriction wall portion 52a, thereby restricting the rotation of the lid body 5 in the opening direction of the front end hole 21 [see FIG. 10 (2)]. ]. The opposite side wall of the inner shaft portion 23 made of the rib comes into contact with the second restriction wall portion 52b, thereby restricting the rotation of the lid body 5 in the closing direction of the front end hole 21 [FIG. See 1)].

-An elastic body 7 made of a compression coil spring is accommodated in the rear of the lid 5 inside the elastic body cylinder 2. An annular spring seat member 71 is attached to the front end of the bullet 7. The spring seat member 71 rotatably holds the spherical outer surface of the lid body 5, and the lid body 5 is always urged forward by the resilient force of the bullet body 7 via the spring seat member 71. . As a result, the lid 5 can be rotated while the outer surface of the lid 5 is always in close contact with the first seal portion 22 on the inner surface of the front end hole 21. On the other hand, the rear end of the projectile 7 is brought into contact with a step on the outer surface of the writing body 3 (specifically, brought into contact with the second seal portion 33), and the writing body 3 is constantly urged backward. The In the present embodiment, the spring seat member 71 is provided between the lid body 5 and the elastic body 7. However, in the present invention, in addition to this, at the front end of the elastic body made of a compression coil spring. A configuration may be employed in which an end turn part is provided and the end turn part is in direct contact with the spherical outer surface of the lid 5.

-Pen-tip protrusion operation | movement The pen-tip protrusion operation | movement of the retractable writing instrument 1 of this Embodiment is shown in FIG.12 and FIG.13.
When the knocking body 26 is pushed forward against the resilience of the projectile 7 in order to change the retractable writing instrument 1 of the present embodiment from the pen tip immersion state to the pen tip protruding state, the inside of the shaft cylinder 2 is The writing body 3 moves forward, the outer cam portion 4 moves forward as the writing body 3 moves forward, and first the first cam portion 61 and the first sliding contact portion 41 come into contact with each other [FIG. 1) to FIG. 12 (2)]. Then, as the writing body 3 moves forward, the first cam portion 61 is in sliding contact along the first sliding contact portion 41. Along with the sliding contact between the first cam portion 61 and the first sliding contact portion 41, the first sliding contact portion 41 presses the first cam portion 61 forward and radially outward. As a result, the lid 5 rotates (counterclockwise in the drawing), the close contact between the first seal portion 22 of the front end hole 21 and the spherical seal portion 51 of the lid 5 is released, and the through groove of the lid 5 is released. 53 and the front end hole 21 communicate with each other, and the front end hole 21 is gradually opened larger [see FIGS. 12 (3) to 13 (1)]. And the sliding contact of the 1st cam part 61 and the 1st sliding contact part 41 is complete | finished, and the 1st cam part 61 leaves | separates from the 1st sliding contact part 41 [refer FIG. 13 (2)]. And the 1st sliding contact part 41 moves ahead rather than the 1st cam part 61, the pen tip 31 protrudes outside from the said open front end hole 21, and the pen tip protrusion state of the retracting mechanism is maintained, and writing It can be used [see FIG. 13 (3)].

Pen-tip immersion operation The pen-tip immersion operation of the retractable writing instrument 1 according to this embodiment is shown in FIGS. 14 and 15.
When the knocking body 26 is pressed forward in order to change the retractable writing instrument 1 of the present embodiment from the pen tip protruding state to the pen tip retracting state, the pen tip protruding state of the retracting mechanism is released, and the projectile 7 The writing body 3 moves backward in the shaft cylinder 2 by the generated force. When the writing body 3 moves rearward, the pen tip 31 of the writing body 3 is immersed in the shaft cylinder 2, and then the second cam portion 62 and the second sliding contact portion 42 come into contact with each other [FIG. ) To FIG. 14 (2)]. Further, the second sliding contact portion 42 is slidably contacted along the second cam portion 62 as the writing body 3 moves backward. Along with the sliding contact between the second sliding contact portion 42 and the second cam portion 62, the second sliding contact portion 42 presses the second cam portion 62 rearward and radially inward. Thereby, the lid 5 rotates (clockwise in the drawing), the communication state between the through groove 53 of the lid 5 and the front end hole 21 is gradually released, and the front end hole 21 is gradually closed [FIG. ) To FIG. 15 (2)]. Finally, the first seal portion 22 of the front end hole 21 and the spherical seal portion 51 of the lid 5 are in close contact with each other in an annular shape, and the front end hole 21 is completely closed [see FIG. 15 (3)]. At this time, the outer surface of the writing body 3 and the inner surface of the shaft cylinder 2 (specifically, the second seal portion 33 on the outer surface of the writing body 3 and the second annular protrusion 25 on the inner surface of the shaft cylinder 2) are in close annular contact with each other, and the front end A sealed space can be formed between the first seal portion 22 and the second seal portion 33 of the hole 21, and the pen tip protruding portion of the writing body 3 and the opening portion of the air hole 34 are accommodated in the sealed space. Thereby, evaporation of ink from the pen tip 31 and the air hole 34 in the pen tip immersion state (when not writing) can be prevented.

The retractable writing instrument 1 of the present embodiment includes a protruding length of the pen tip 31 from the front end of the container 32 of the writing body 3, the position and shape of the outer cam portion 4 on the outer surface of the writing body 3, and the inner side of the inner surface of the lid 5. The position and shape of the cam portion 6 or the position and shape of the inner surface of the bottom wall portion of the lid 3 are appropriately set. Accordingly, the pen-type writing instrument 1 of the present embodiment is set so that the pen tip 31 does not contact the lid 5 in the pen tip protruding process and the pen tip immersing process. Therefore, it is possible to prevent the pen tip 31 from being damaged and the ink stain near the pen tip 31 from being generated.

It is a partially notched longitudinal cross-sectional view which shows the nib immersion state of embodiment of this invention. It is a principal part enlarged view of FIG. It is a partially notched longitudinal cross-sectional view which shows the pen tip protrusion state of embodiment of this invention. It is a principal part enlarged view of FIG. It is a perspective view which shows the internal structure of FIG. (The two-dot chain line indicates the shaft cylinder.) It is a perspective view which shows the internal structure of FIG. (The two-dot chain line indicates the shaft cylinder.) It is a longitudinal cross-sectional perspective view which shows the front-end part inner surface of the axial cylinder of embodiment of this invention. It is a perspective view from the spherical-shaped seal part side of the cover part of embodiment of this invention. It is a perspective view from the penetration groove side of the lid of an embodiment of the invention. It is explanatory drawing which shows the relationship between the outer side shaft part and inner side shaft part of embodiment of this invention, (1) shows the closed state of a front-end hole, (2) shows the open state of a front-end hole. It is a perspective view which shows the pen point side of the writing body of embodiment of this invention. The process in the middle from the pen tip immersion state of the embodiment of the present invention to the pen tip protruding state is shown. (1) shows the pen tip immersion state, (2) shows the sliding contact start state between the first cam portion and the first sliding contact portion, and (3) shows the first cam portion and the first sliding contact portion. The sliding state is shown. The process from the sliding contact state of the 1st cam part and 1st sliding contact part of embodiment of this invention to a pen tip protrusion state is shown. (1) shows the next state of FIG. 12 (3), (2) shows the next state of FIG. 13 (1), and (3) shows the pen tip protruding state. The process in the middle from the pen tip protrusion state of the embodiment of the present invention to the pen tip immersion state is shown. (1) shows the pen tip protruding state, (2) shows the sliding contact start state between the second cam portion and the second sliding contact portion, and (3) shows the second cam portion and the second sliding contact portion. The sliding state is shown. The process from the sliding contact state of the 2nd cam part and 2nd sliding contact part of embodiment of this invention to a pen tip immersion state is shown. (1) shows the next state of FIG. 14 (3), (2) shows the next state of FIG. 15 (1), and (3) shows the pen tip immersion state.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Retractable writing instrument 2 Shaft cylinder 21 Front end hole 22 First seal part 23 Inner shaft part 24 First annular protrusion 25 Second annular protrusion 26 Knock body 3 Writing body 31 Pen tip 32 Container 32a Large diameter portion 32b Small diameter portion (pen tip Holding part)
33 Second seal portion 34 Air hole 4 Outer cam portion 41 First sliding contact portion 42 Second sliding contact portion 5 Lid 51 Spherical seal portion 52 Outer shaft portion 52a First regulating wall portion 52b Second regulating wall portion 53 Through Groove 6 Inner cam
61 1st cam part 62 2nd cam part 7 Bullet 71 Spring seat member

Claims (9)

A lid body that accommodates a writing body that holds a pen tip at a front end in an axial cylinder so as to be movable in an axial direction, the pen tip is configured to be able to protrude and retract from a front end hole of the axial cylinder, and has a spherical seal portion on an outer surface Is provided in the front end portion of the shaft cylinder so as to be rotatable, and a resilient body for urging the lid body forward is provided in the shaft cylinder. When the pen nib is immersed, the spherical seal portion of the lid body is used as a front end hole. The front end hole is closed by close contact, and when the pen tip protrudes, it is a retractable writing instrument that opens the front end hole by releasing the close contact between the spherical seal part of the lid and the front end hole,
An inner cam portion is formed on the inner surface of the lid, and an outer cam portion slidably contacted with the inner cam portion is formed on the outer surface of the pen tip holding portion of the writing body. In the process of making the inner cam part and the outer cam part slidably contact, by rotating the lid body to open the front end hole, in the process of changing from the pen tip protruding state to the pen tip immersion state, A retractable writing instrument, wherein the inner cam portion and the outer cam portion are brought into sliding contact with each other to rotate the lid and close the front end hole. The inner cam portion includes a first cam portion and a second cam portion, and the outer cam portion is slidably contacted with the first cam portion and the second cam portion. The first slidable contact portion and the first slidable contact portion in the process of changing from the pen tip immersion state to the pen tip protruding state. In the process of opening the front end hole by moving the pen tip from the pen tip protruding state to the pen tip immersive state, the lid is rotated by sliding the second cam portion and the second sliding contact portion. The retractable writing instrument according to claim 1, wherein the front end hole is closed. 3. The retractable type according to claim 2, wherein the inner cam portion includes a protruding portion integrally formed on the inner surface of the lid, and the first cam portion and the second cam portion are formed on a peripheral surface of the inner cam portion. Writing instrument. The outer cam portion is formed integrally with the outer surface of the cursive body, and is slightly separated from the first slidable contact portion formed of an inclined wall portion inclined with respect to the axis, and the first slidable contact portion of the outer surface of the cursive body. The retractable writing instrument according to claim 2 or 3, comprising a second sliding contact portion formed of a protrusion integrally formed at a position. A pair of the inner cam portions are formed at symmetrical positions on both sides of the inner surface of the lid, and a pair of the outer cam portions are formed at symmetrical positions on the outer surface of the pen tip holding portion of the writing body. 4. The haunting type writing instrument according to any one of 4 above. The retractable writing instrument according to any one of claims 1 to 5, wherein an outer cam portion is formed on an outer surface of a front end portion of the pen point holding portion of the writing body. In the process of changing from the pen tip immersion state to the pen tip protruding state, the first cam portion and the first sliding contact portion are slidably contacted, and the second cam portion and the second sliding contact portion are non-sliding. The second cam portion and the second slidable contact portion are slidably contacted with each other in the process of changing from the pen tip protruding state to the pen tip immersive state, and the first cam portion and the first slidable contact state. The retractable writing instrument according to any one of claims 2 to 6, wherein the part is brought into a non-sliding contact state. The retractable writing instrument according to any one of claims 1 to 7, wherein the outer cam portion is positioned in front of the inner cam portion in the pen tip protruding state. An outer shaft portion is provided at a symmetric position on both sides of the outer surface of the lid body, and an inner shaft portion that can be engaged with the outer shaft portion is provided at a symmetric position on the inner surface of the front end portion of the shaft cylinder, and the outer shaft portion or the inner shaft is provided. A first restricting wall portion for restricting rotation of the lid body in the opening direction of the front end hole, and a lid body in the closing direction of the front end hole. A second restricting wall portion that restricts the rotation of the lid body, and the lid body is configured to be rotatable within a predetermined range by engaging the outer shaft portion and the inner shaft portion. The intrusive writing instrument according to any one of 8 above.

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