JP2005111906A - Duplex writing utensil - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a duplex writing utensil capable of solving inconveniences occurring within the writing utensil by an impact at the return of a writing body, without making a product structure and assembly process complicated and increasing production cost due to the increase in the number of part items. <P>SOLUTION: A plurality of writing bodies energized backward with an elastic member are accommodated within a barrel having a tip end opening part and receiving part. A sliding body is connected to the rear end of the writing bodies respectively. The operation part of the sliding body is projected in the radial direction on the outside from a plurality of window holes provided on the outer peripheral surface at the back of the barrel. The forward sliding of the operation part causes either one of the writing bodies to advance to project its pen tip through the tip opening of the barrel, and at the same time to retreat the other writing body in an advancing position. The composite writing utensil has a decelerating part to decelerate the retreat speed of the sliding body by allowing the window holes to be in slidable contact with the sliding body before the sliding body hits on the receiving body at the retreat of the sliding body. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a compound writing instrument. Furthermore, the present invention relates to a compound writing instrument that can prevent air from being mixed into the ink and broken core of the mechanical pencil core due to impact upon return.

Conventionally, a plurality of writing bodies, each having a sliding body connected to the rear end, are urged rearward by a resilient member and accommodated in a shaft cylinder, so that any one writing pen can be moved forward by a sliding operation. In a dual-type writing instrument in which the tip protrudes and the other writing body in the forward position moves backward, so-called slide type writing instrument, the receiving part and the sliding body provided on the shaft cylinder when the writing body is retracted (returned) The structure which stops by making it collide with is used.
However, when the structure is used, a strong impact in the front-rear direction is generated when the receiving part of the shaft cylinder and the sliding body collide with each other. Therefore, the writing body incorporates low viscosity ink or ink having shear thinning viscosity. In the case of a ballpoint pen, a ballpoint pen with a high-viscosity fluid (liquid stopper) disposed at the rear end of the ink, or a mechanical pencil, the ink moves due to impact, or air is mixed into the ink storage tube or stored The mechanical pencil lead sometimes broke.
Therefore, in order to solve the above problem, in the double-type writing instrument with a built-in mechanical pencil, a buffer member is provided between the receiving portion at the rear end of the shaft cylinder that abuts the sliding body at the time of return, and the sliding body. There has been disclosed a double-type writing instrument that alleviates the impact at the time and prevents the mechanical pencil core from breaking (for example, Patent Document 1).
Japanese Patent Laid-Open No. 5-28687

  The double-type writing instrument disclosed in Patent Document 1 can reduce the impact at the time of return through the buffer member and prevent the mechanical pencil core from breaking, but the number of parts increases by adding the buffer member. Since the structure becomes complicated, the assembly process becomes complicated and the manufacturing cost increases.

  The present invention solves the above-mentioned conventional problems, and the problem that occurs in the writing body due to the impact at the return without complicating the product structure and assembly process due to the increase in the number of parts or increasing the manufacturing cost. It provides a double-type writing instrument that can solve the problem.

According to the present invention, a plurality of writing bodies are accommodated in a shaft cylinder provided with a front end opening and a receiving portion by being urged rearward by a resilient member, and sliding bodies are connected to the rear ends of the writing bodies, respectively. Then, the operation part of the sliding body protrudes radially outward from a plurality of window holes provided on the outer peripheral surface behind the shaft cylinder, and any one of the writing bodies is advanced by sliding the operation part forward. The pen tip protrudes from the opening of the tip of the shaft tube and retreats the other writing body at the forward movement position, and the window hole is configured so that the sliding body impinges on the receiving portion when the sliding body is retracted. It is necessary to have a speed reducing portion that slidably contacts the sliding body before the mating and relaxes the retreating speed of the sliding body. Further, it is a requirement that the speed reducing portion of the window hole is formed in a tapered shape having a narrow width on the rear end side in the axial direction.
In the present invention, “front” refers to the pen tip side, and “rear” refers to the sliding body side.

  The dual-type writing instrument according to the first aspect of the present invention can be solved by a conventional method without being able to eliminate a problem that occurs in the cursive body due to an impact at the time of return, and without increasing the number of parts and complicating the assembly process.

The compound writing instrument is configured such that a plurality of writing bodies are urged rearward by a resilient member in a shaft cylinder having an open end and a receiving portion. A sliding body is connected to the rear end of the writing body, and an operating portion of the sliding body projects in a radial direction from a plurality of window holes provided on the outer peripheral surface behind the shaft cylinder. By sliding the operation portion forward, any one of the writing bodies is advanced and the pen tip protrudes from the tip opening of the shaft tube, and the other writing bodies in the advance position are pushed by the elastic member. It is the structure made to recede by. When the writing body moves backward, the sliding body abuts on a receiving portion provided on the shaft tube and stops. The speed of the sliding body at the time of return is reduced by providing a speed reducing part that changes the shape of the window hole so that the pressing force by the elastic member can be eased at the time of collision, and it is stored at the time of collision. The impact in the front-rear direction applied to the cursive body can be eased and stopped gently.
The receiving part can be provided in the window hole itself according to the shape of the sliding body. In that case, it is also possible to make a deceleration part into a receiving part.

  The speed reduction part is formed by making one or both sides of the inner side surface (sliding body guide part) in the axial direction of the window hole into a rough surface, a curved surface, a taper shape, or providing a convex part. A contact resistance (friction resistance) can be imparted to the guide portion of the window hole by the speed reduction portion, and the sliding body connected to the writing body retreating by the pressing force of the elastic member is brought into sliding contact with the speed reduction portion. The retraction speed is reduced before it collides with the receiving part. Therefore, the impact applied to the cursive body at the time of the collision can be alleviated, so that it can be stopped gently without giving a large impact to the stored cursive body. Furthermore, a silencing effect can be exerted to mitigate the sound generated when the sliding body collides with the receiving portion when the cursive body is stored.

In particular, a taper portion having a narrow width is provided on one or both surfaces in the axial direction of the window hole on the rear end side in the axial direction (Claim 2), thereby effectively delaying the retreating speed of the sliding body when storing the writing body. In addition, the pen tip can be projected without giving excessive resistance to the sliding operation forward of the sliding body.
When the tapered portion is provided on one side of the guide portion, the sliding body that moves backward is decelerated by pressing it against the guide portion facing the tapered portion, and the impact caused by the collision with the receiving portion is reduced. Further, when the tapered portions are provided on both surfaces of the guide portion, the sliding body that moves backward is sandwiched between both tapered portions to decelerate, and the impact that occurs at the time of collision with the receiving portion is reduced.

  In particular, in a type of writing body in which a high-viscosity fluid (liquid stopper) is disposed at the rear end of the ink, air can be prevented from being mixed into the ink and the high-viscosity fluid can be prevented from collapsing. Further, the mechanical pencil can prevent the core from breaking.

  According to the present invention, it is possible to provide a dual-type writing instrument that eliminates a problem that occurs in a writing body due to an impact at the time of return, without complicating the product structure and assembly process due to an increase in the number of parts or increasing the manufacturing cost.

  Embodiments of the present invention will be described with reference to the following examples.

Embodiments of the present invention will be described with reference to the following drawings.
The compound writing instrument 1 of FIGS. 1 to 3 has a window hole 21 and a tip opening 22, and a pen tip (ballpoint pen tip) 41 and an ink container are accommodated inside a shaft body 2 that is detachably screwed in the front-rear direction. A ballpoint pen or a mechanical pencil composed of a tube 42 is used as a writing body 4 and a plurality of (three) writing bodies 4 are accommodated so as to move back and forth. The sliding body 3 is connected to the rear end of the writing body 4, and an operation portion 31 of the sliding body 3 is provided so as to protrude from the window hole 21. The sliding body 3 is disposed between the holder 6 provided with a plurality of holes having an inner diameter slightly larger than the outer diameter of the ink containing tube 42 and the sliding body tip (writing body connecting portion 32). It is urged rearward by a resilient member (spring) 5 to suppress backlash of the sliding body 3 and the writing body 4 in the front-rear direction.
At the time of writing, by sliding the operation portion 31 of the sliding body 3 forward, the pen tip 41 of the writing body 4 to be connected is projected from the tip opening 22, and a locking portion 34 is provided in the shaft tube 2. It is latched by the latching protrusion and is in a writable state. When the pen tip 41 is stored, the other sliding body 3 '(operation part 31') is slid forward, and is pressed outward by the pressing projection 35 of the sliding body 3 '. The locking portion 34 of the moving body 3 is disengaged from the locking projection, and the sliding body 3 is pressed backward by the resilient member 5 that urges the sliding body 3 backward, and is accommodated in the shaft tube. At that time, the contact portion 33 abuts against the receiving portion 23 of the shaft tube 2 and stops.
In this embodiment, the clip is integrally formed on the rear side of the shaft tube, but the sliding body 3 (operation unit 31) can be integrated with the clip.

FIG. 2 is an enlarged view of the periphery of the window hole 21 in FIG. 1 (when the cursive body is accommodated), and FIG. 3 is a diagram showing a state in which writing is possible in FIG. Each of the three window holes 21 formed in the shaft cylinder 2 forms a gently tapered portion 212 having a narrow width at the rear end side of the shaft cylinder, with the guide portions 211 on both sides extending from the center to the rear. The narrow side of the tapered portion 212 is slightly narrower than the width of the rear end (rear locking portion 34 side) of the sliding body 3. The taper portion 212 can be adjusted to a desired shock absorption capacity by adjusting the angle and length according to the ink, high-viscosity fluid, and mechanical pencil core accommodated in the writing body 4. Further, the tapered portion 212 can be used as a receiving portion of the sliding body 3.
When the writing body is accommodated, the sliding body 3 is urged rearward by the spring 5 so that the contact portion 33 can be held in contact with the receiving portion 23 of the shaft tube 2 and the sliding body on the narrow side of the tapered portion 212. 3 can be held, so that the sliding body 3 is stationary in a state in which the back-and-forth movement and the back-and-forth movement are suppressed.
At the time of writing, the operation unit 31 of the sliding body 3 is slid forward, and writing can be performed by causing the pen tip 41 of the writing body 4 connected to the sliding body 3 to protrude from the shaft tube opening 22. At that time, the sliding body 3 can be moved forward without feeling resistance when sliding.
When the pen point 41 is stored after writing, the sliding body 3 is moved backward by the spring 5 that urges the sliding body 3 backward by sliding the operation portion 31 ′ of the other sliding body 3 ′ forward. Move to press. At that time, the sliding body 3 slides on the guide portion 211 and decelerates as the taper portion 212 moves toward the narrow side (the rear end side of the window hole). When they are combined, the speed is moderate, and the cursive body 4 can be stored in the shaft cylinder without giving a large impact.

It is an external view which shows one Example of the double-type writing instrument of this invention. It is a window hole periphery enlarged view in FIG. It is a window hole periphery enlarged view at the time of writing of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Compound writing instrument 2 Shaft cylinder 21 Window hole 211 Guide part 212 Deceleration part (taper part)
DESCRIPTION OF SYMBOLS 22 Tip opening part 3, 3 'Sliding body 31, 31' Operation part 32 Connection part 33 Contact part 34 Locking part 35 Pressing protrusion 4 Writing body 41 Pen tip 42 Ink accommodating tube 5 Spring member (spring)
6 Holder

Claims (2)

  A plurality of writing bodies are housed in a shaft cylinder provided with a tip opening and a receiving portion by being urged rearward by a resilient member, and sliding bodies are connected to rear ends of the writing bodies, respectively. The operating part of the moving body protrudes radially outward from a plurality of window holes provided on the outer peripheral surface behind the shaft cylinder, and by sliding the operating part forward, one of the writing bodies is advanced to advance the pen tip. Is a dual-type writing instrument that protrudes from the tip opening of the shaft cylinder and retreats the other writing body in the advanced position, and the window hole is in a state where the sliding body collides with the receiving portion when the sliding body is retracted. A dual-type writing instrument comprising a speed reducing portion that slidably contacts a sliding body and relaxes the retreating speed of the sliding body.   The compound writing instrument according to claim 1, wherein the speed reducing portion of the window hole is formed in a tapered shape having a narrow width on the rear end side in the axial direction.

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