JP3126671U - Double writing instrument - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a dual-type writing instrument capable of eliminating a problem that occurs in a writing body due to an impact at the time of return without complicating an assembling process or increasing a manufacturing cost by increasing the number of parts.
SOLUTION: A plurality of writing bodies are accommodated by being biased rearward by a resilient member in a shaft cylinder having an open end. A sliding body is connected to the rear end of the writing body. The operating portion of the sliding body is projected radially outward from a plurality of window holes provided on the outer peripheral surface behind the shaft cylinder. By sliding the operation unit forward, one of the writing bodies is advanced to project the pen tip from the tip opening of the shaft tube, and the other writing body in the advanced position is retracted. The sliding body has a buffer portion that absorbs and relaxes an impact that occurs when the sliding body abuts against the receiving portion of the shaft cylinder when the writing body is retracted.
[Selection] Figure 1

Description

  The present invention relates to a compound writing instrument. Furthermore, the present invention relates to a dual-type writing instrument that can prevent air from being mixed into ink due to an impact at the time of return and a mechanical pencil lead from breaking.

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 double-type writing instrument in which the tip protrudes and the other writing body in the forward position moves backward, that is, a so-called slide-type writing instrument, the receiving part of the shaft tube and the sliding body collide with each other when the writing body is retracted (returned). The pen tip is stored by stopping by combining.
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. If it is a ballpoint pen with a high-viscosity fluid (liquid stopper) at the rear end of the ink or a mechanical pencil, the ink will move due to impact, or air may be mixed in the ink storage tube, The mechanical pencil lead to be accommodated 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 is a compound type that can solve the problems that occur in the writing body due to the impact at the time of return without complicating the assembly process by increasing the number of parts or increasing the manufacturing cost. A writing instrument is provided.

According to the present invention, a plurality of writing bodies are accommodated in a shaft cylinder having an opening at a front end by urging them by a resilient member, and a sliding body is connected to a rear end of the writing body, and an operating portion of the sliding body is provided. Is protruded radially outward from a plurality of window holes provided on the outer peripheral surface of the rear side of the shaft cylinder, and by sliding the operation unit forward, any one of the writing bodies is advanced to move the pen tip of the shaft cylinder. It is a dual-type writing instrument that protrudes from the opening at the tip and retracts other writing bodies in the forward position, and absorbs and reduces the shock that occurs when the sliding body collides with the receiving part of the shaft cylinder when the writing body retracts It is a requirement to have a buffering part. Further, the sliding body requires that a buffer portion having a spring property in the front-rear direction is integrally formed, and that the buffer portion is formed by a thin portion.
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 claim 1 of the present invention can solve the problems that occur in the cursive body due to the impact at the time of return, and can be manufactured by a conventional method 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. A sliding body is connected to the rear end of the writing body, and an operating portion of the sliding body protrudes radially outward from a plurality of window holes provided on the outer peripheral surface at the rear of 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 portion of the shaft tube, and the other writing bodies in the advanced position are pushed by the elastic member. It has 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. When stopping, by providing the sliding body with a buffer part made of a shape or material that can absorb and relieve the pressing force of the elastic member, the impact applied to the stored writing body is moderated and relaxed. You can stop.

  The material of the sliding body may be any of general-purpose synthetic resin, metal, etc. In particular, the sliding body itself is formed by molding the sliding body using various thermoplastic elastomers and rubbers having elasticity. Since it becomes a buffer part, it becomes possible to absorb the impact at the time of a collision, it can stop gently at the time of accommodation, and the influence on a cursive body can be eased.

By integrally molding the sliding body into a shape that includes a buffer portion having a spring property in the front-rear direction, a sliding body having excellent assemblability and a desired hardness can be obtained. In addition, as the sliding body, a crank shape is provided between a portion provided with a notch or a hole in the radial direction, a contact portion with a receiving portion of the shaft cylinder of the sliding body, and a writing body connecting portion. It can be easily obtained by forming a thin part in the buffer part (claim 3).
In the former, by providing a notch or hole in the radial direction and forming a thin part near the contact part, the thin part bends when the sliding body contact part abuts against the receiving part of the shaft tube. , Absorb and mitigate the impact in the front-rear direction. The latter is the axial direction between the abutting portion of the sliding body and the writing body by forming a crank-shaped thin portion between the abutting portion of the sliding body with the receiving portion of the shaft cylinder and the writing body connecting portion. Therefore, when the sliding body collides with the receiving portion of the shaft tube, the impact in the longitudinal direction generated in the axial direction is absorbed by the crank portion, and the influence on the writing body can be mitigated.

  In particular, a writing instrument with a high-viscosity fluid (liquid stopper) at the rear end of the ink can prevent air from entering the ink and collapse of the high-viscosity fluid. Breakage can be prevented.

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

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

An embodiment of the present invention will be described with reference to the following drawings.
1 to 4 is of a type in which the rear end (contact portion 31) of the sliding body 3 abuts with the receiving portion 21 of the shaft tube 2 at the time of return, and includes a window hole 23 and a tip opening portion. A plurality of (three) writing bodies 4 each including a pen tip (ball pen tip) 41 and an ink storage tube 42 are accommodated in a shaft body 2 that is detachably screwed in the front-rear direction. is doing. A sliding body 3 is connected to the rear end of the writing body 4, and an operation portion 33 of the sliding body 3 is provided so as to protrude from the window hole 23. The sliding body 3 is an elastic member 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 tip of the sliding body (writing body connecting portion). It is urged rearward by the emitting 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 33 of the sliding body 3 forward, the pen tip 41 of the writing body 4 to be connected is projected from the tip opening portion 22, and a locking portion 38 is formed in the shaft tube 2. It is locked by the locking protrusion and is in a writable state. When the pen tip 41 is stored, by sliding another sliding body forward, the pressing projection 39 of the sliding body is pressed outward, and the locking portion 38 of the sliding body 3 is locked. The sliding body 3 is pushed backward and stored by a resilient member 5 that is disengaged from the protrusion and biases the sliding body 3 backward. At that time, the contact portion 31 abuts on the receiving portion 21 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 portion 33) can be integrated with the clip.

  The sliding body 3 in FIG. 2 is a resin molded product in which a radial notch 34 is provided in the vicinity of the contact portion 31 and a thin portion 35 serving as a buffer portion is formed on the contact portion 31 side. 3 is a resin molded product in which a hole 36 is provided in the vicinity of the contact portion 31 and a thin portion 35 is formed on the contact portion 31 side. 2 and 3 both absorb and mitigate the impact by bending the thin portion 35 when the contact portion 31 abuts the receiving portion 21 at the time of return. Since the shock absorption capacity can be adjusted by adjusting the position and size of the notch 34 and the hole 36, the shock absorption according to the material of the sliding body 3, the viscosity of the ink and the high viscosity fluid in the writing body 4, and so on. Ability can be added.

  The sliding body 3 in FIG. 4 is a resin molded product in which a crank portion 37 is formed by a thin portion 35 between a contact portion 31 of the shaft tube 2 with the receiving portion 21 and a writing body connecting portion 32. The crank portion 37 causes the axial position of the contact portion 31 of the sliding body 3 and the writing body connecting portion 32 to shift in the axial direction, so that when the sliding body 3 abuts on the receiving portion 21 at the time of return, it is generated in the axial direction. The impact is absorbed by the thin portion 35 being bent, and the influence on the cursive body 4 can be mitigated.

The compound writing instrument 1 of FIGS. 5 to 6 is of a type that abuts against the receiving portion 21 of the shaft cylinder 2 in front of the sliding body 3 at the time of return.
The sliding body 3 in FIG. 5 is a resin molded product in which a thin-walled portion 35 is formed by providing radial cutouts in front of the abutting portion 31 of the sliding body 3, and the sliding body 3 in FIG. This is a resin molded product in which the front part of the contact part 31 is an S-shaped thin part 35. 5 and 6 both absorb and mitigate the impact by bending the thin portion 35 when the abutting portion 31 abuts the receiving portion 21 at the time of return. Since the shock absorption capacity can be adjusted by adjusting the size and width of the notch or the S-shaped thin portion 35, the impact corresponding to the material of the sliding body 3, the ink in the writing body 4 and the viscosity of the high viscosity fluid. Absorbability can be imparted.

It is a longitudinal cross-sectional view which shows one Example of the double-type writing instrument of this invention. It is a principal part enlarged view of FIG. It is a longitudinal cross-sectional view which shows another Example. It is a longitudinal cross-sectional view which shows another Example. It is a longitudinal cross-sectional view which shows another Example. It is a longitudinal cross-sectional view which shows another Example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Compound writing instrument 2 Shaft cylinder 21 Receiving part 22 Tip opening part 23 Window hole 3 Sliding body 31 Contact part 32 Connection part 33 Operation part 34 Notch part 35 Thin part (buffer part)
36 hole portion 37 crank portion 38 locking portion 39 pressing protrusion 4 cursive body 41 pen tip 42 ink containing tube 5 elastic member 6 holder

Claims (3)

  A plurality of writing bodies are accommodated in a shaft cylinder having an opening at the rear end by urging the elastic member, and a sliding body is connected to the rear end of the writing body. By projecting radially outward from a plurality of window holes provided on the outer peripheral surface of the lens and sliding the operation unit forward, any one of the writing bodies is advanced to move the pen tip from the tip opening of the shaft tube. A dual-type writing instrument that protrudes and retreats other writing bodies in an advanced position, and a buffer portion that absorbs and reduces shocks generated when the sliding body collides with a receiving portion of a shaft cylinder when the writing body retreats. A dual-type writing instrument characterized by having.   The compound writing instrument according to claim 1, wherein the sliding body is formed by integrally forming a buffer portion having a spring property in the front-rear direction.   The compound writing instrument according to claim 1, wherein the buffer portion is formed by a thin portion.

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