JPH10329488A - Pop-out writing utensil - Google Patents

Abstract

PROBLEM TO BE SOLVED: To secure the movement of a writing element beyond a pressing level with a slight force by providing a single bending member between a pressing member and the writing element and stretching the bending member with the structural help of a pressing action by the pressing member and an inclined plane provided on the inner face of a shaft barrel or the pressing member. SOLUTION: A pressing member 7 presses a movable piece 11 by pressing the pressing member 7 forward from a state that a mechanical pencil unit 4 is retracted, and the movable piece 11 moves to the right along the inclined plane 6 of a rear shaft 3. Further, the bending part 9 of a bending member 8 is pressed by the movement of the movable piece 11, resulting in the stretching of the bending member 8. In this case, the bending member 8 itself is caused to move forward by the pressing member 7. The bending member 8 is caused to advance by the forward movement of the pressing member 7 and the stretching of the bending member 8. Here, the forward movement of a receiving part 10 beyond the pressing level of the pressing member 7 is generated and the mechanical pencil unit 4 protrudes from the tip member 5 of a shaft barrel 1 following the advance of the receiving part 10.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a writing instrument in which a writing body is slidably disposed inside a barrel and the writing body is arranged to be able to protrude and retract from the barrel. The present invention relates to a mechanism capable of obtaining a large amount of movement of the.

[0002]

2. Description of the Related Art As one example, Japanese Utility Model Application Laid-Open No. 58-143275.
There is an official gazette. In the utility model registration claim of the publication, an inner toothed ridge in the axial direction is provided on the inner surface of the shaft cylinder, and a rotor having an outer toothed slidable along the ridge is provided. When the tooth is advanced by knocking and the teeth of the two ridges are released, the ridge rotates and the tooth surfaces of the two ridges engage with each other to extend the pen tip of the refill. Each member is bent in a side-to-side shape with the middle abdomen outward, and when it is advanced by knocking, an elastic member that is linearly extended by being restricted by the inner wall of the small-diameter portion of the shaft cylinder presses the rotor to reduce the rotational force. A knock ball pen interposed between a given knock member and a knock cover. "

[0003]

However, in the prior art as described above, although the structure is such that the amount of movement of the refill is larger than the amount of pressing of the knock cover, the extension member is extended. It was not easily expanded due to the frictional force between the elastic member and the inner surface of the barrel at that time. Also,
As the number of pieces of the expansion member increases, the sense of stability of the knock cover improves, but the frictional force also increases, making operation difficult. However, in order to expand such an elastic member that is difficult to expand, a strong pressing force is required.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and a writing body is slidably disposed inside a barrel, and the writing body can be protruded and retracted from the barrel. A writing member that presses and advances the writing body on the barrel, and a bending member is disposed between the pressing member and the writing body, and the bending member is formed by the pressing member. And the inner surface of the barrel or the inclined surface provided on the pressing member.

[0005]

FIG. 1 to FIG. 5 show a first example. Shaft barrel 1
Is composed of a front shaft 2 and a rear shaft 3, which are detachably fixed by screwing or the like. Its front axis 2
Inside, a sharp pencil unit 4 described later is disposed so as to be able to move back and forth while being urged rearward by a repelling member S such as a coil spring. Is called forward). A tip member 5 is detachably fixed to the front end of the front shaft 2 by screwing or the like. An inclined surface 6 is formed at an intermediate portion of the inner surface of the rear shaft 3, and a pressing member 7 is disposed at a rear end of the rear shaft 3 in a protruding state. At one end of the lower end of the pressing member 7, a rectangular bending member 8 is formed continuously with a bending portion 9 formed inward, and at the lower end of the bending member 8,
A cylindrical receiving portion 10 is formed at the rear end of the sharp pencil unit 4 for press-fitting. A moving piece 11 is disposed between the bending portion 8 and the inclined surface 6 of the rear shaft 3, and a rear end face of the moving piece 11 is in contact with a front end face of the pressing member 7. Reference numeral 12 denotes a clip formed integrally with the rear shaft 3, but may be formed as a separate member and fixed to the rear shaft 3.

Next, the sharp pencil unit 4 will be described. An eraser 14 is press-fitted on the inner surface of the rear end of the core tank 13 for storing a plurality of cores, and a receiving portion 10 of the pressing member 9 is press-fitted on the outer periphery. On the other hand, a chuck body 17 for holding and releasing the lead is fixed to the front end of the lead tank 13 via a relay member 16 having a through hole 15 through which one lead can pass. Also,
An outer shaft 18 is attached in front of the core tank 13 so as to cover the relay member 16 and the chuck body 17.
A base 19 is detachably attached to the front end of the outer shaft 18 by screwing or the like. A chuck spring 20 for urging the core tank 13 and the chuck body 17 rearward is stretched inside the outer shaft 18.
A chuck ring 21 for opening and closing the chuck body 17 is also provided. Further, a center detent member 22 for preventing the core from retreating is press-fitted inside the base 19.

A cam mechanism 23 is provided at an intermediate portion of the barrel 1. The cam mechanism 23 will be described.
On the inner surface of the intermediate portion of the front shaft 2, a first projection 24,
A cam groove 25, a second projection 26, a first projection 24,... Are formed. The first projection 24 has a shallow groove 27 formed thereon, and further, at the front ends of the first projection 24 and the second projection 26, inclined surfaces 28 and 29 are formed. reference).

In the middle part of the core tank 13, projections 30 are formed radially so as to slide in the cam grooves 25 of the front shaft 2, and at both ends of the projections 30 are formed mountain-shaped teeth 31. Is formed. In front of the projection 30 of the core tank 13, a reduced diameter portion 32 is formed. A stepped portion 33 formed by the reduced diameter portion 32 has a mountain-shaped inclined surface 34 having the top of the tooth 31 as a top. Are formed. A rotor 35 is inserted in front of the core tank 13, and a front end of the rotor 35 is in contact with a rear end of the outer shaft 18. A plurality of mountain-shaped protrusions 36 are sequentially formed at the rear end of the rotor 35, and an outer peripheral protrusion 37 is formed on every other protrusion 36. Outer peripheral protrusion 37
At the rear end, an inclined surface 38 that meshes with the teeth 31 of the core tank 13 is formed. The outer peripheral projection 37 is, like the projection 30 of the core tank 13, formed on the cam groove 25 of the front shaft 2.
Can be moved back and forth.

Next, the operation will be described. Pressing member 7 from the state of FIG. 1 (sharp pencil unit submerged state)
Is pressed forward, the pressing member 7 presses the moving piece 11, and the moving piece 11 moves rightward in the figure along the inclined surface 6 of the rear shaft 3. The movement of the movable piece 11 pushes the bending portion 9 of the bending member 8, and the bending member 8
Elongates. At this time, the bending member 8 itself is also advanced by the pressing member 7. That is, the bending member 8 is advanced by the advance of the pressing member 7 and the extension of the bending member 8. Here, the forward movement amount of the receiving portion 10 equal to or more than the pressing member 7 is generated. Then, as the receiving portion 10 advances, the sharp pencil unit 4 projects from the tip member 5 of the barrel 1.

When the bending member 8 is fully extended, the protrusion 37 of the rotor is located below the cam groove 25, and the angled inclined surface 34 of the core tank 13 and the rotor 37 are in contact with each other. The engagement of the 35 with the inclined surface 38 causes the rotor 35 to rotate (see FIG. 4). Here, when the pressing operation of the pressing member 7 is released, the rotor 35
With the repelling force of the repelling member S together with the pupil unit 4, it retreats, and on the way, the inclined surface 38 of the projection 38 of the rotor 35 contacts the inclined surface 28 of the first projection 24 of the front shaft 2, and the rotor 35 Although the retraction is prevented, the sharp pencil unit 4 further continues the retraction operation, and retreats by an amount corresponding to the extension of the chuck spring 14 and eventually stops. This prevents the sharp pencil unit 4 from entering the shaft cylinder (see FIG. 5). Next, when the core is extended, the pressing member 7 is pressed again. This pressing operation may be small. Then, by this small pressing operation, the lead tank 13 and the chuck body 17 advance and expand, and the lead is fed out.

Here, the sharp pencil unit 4
When the user wants to be immersed (stored) in the barrel 1, the pressing member 7 is pressed again. Then, the pressing member 7
Receiving part 10 is a sharp pencil unit 4 and a rotor 3
5 is advanced again, and the protrusion 37 of the rotor 35 is eventually formed.
Moves forward from the first protrusion 24, and at this time, the rotor 3
5 rotates, the protrusion 37 becomes coaxial with the cam groove 25, and is pushed back by the elastic member S. With this,
The pencil unit 4 is immersed.

In the above-described example, a sharp pencil is disposed in the shaft cylinder as a writing body, and is protruded and retracted. However, an oily or water-based ball pen may be disposed as the writing body.

A second example will be described with reference to FIGS. Instead of not using the moving piece 11 of the first example, the bending member 3
9 is an example in which a front piece 40 of the ninth surface is brought into surface contact with an inclined surface 42 of a rear shaft 41. Also in this example, when the pressing member 7 is pressed, the bending member 39 is extended by the inclined surface 42, and the bending member 39 itself is advanced (see FIG. 7). Compared to the first example, the number of members can be reduced,
Since the number of assembly steps can be reduced, an inexpensive product can be provided.

A third example will be described with reference to FIGS. This is a so-called side-press type writing instrument in which the pressing member 43 is disposed on the side surface of the shaft cylinder 44. The pressing member 43 has a bottom 45 and an inclined surface 46 which is provided continuously from the bottom 45.
On the other hand, the refraction member 47 is formed with a refraction portion 48 that contacts the bottom portion 45 and an inclined surface 49 that contacts the inclined surface 46. When the pressing member 43 is pressed rightward in the drawing, the bottom portion 45 of the pressing member 43 extends the refraction member 47, and the inclined surface 46 of the pressing member 43 presses the inclined surface 49 of the refraction member 47. To move forward.

[0015]

According to the present invention, there is provided a writing instrument in which a writing body is slidably disposed inside a barrel, and the writing body is arranged so as to be able to protrude and retract from the barrel, wherein the writing body is pressed against the barrel. Along with the pressing member to be advanced, one bending member is disposed between the pressing member and the writing body, and the bending member is provided on the pressing operation of the pressing member and the inner surface of the barrel, or provided on the pressing member. Since it is extended by the inclined surface, it is possible to secure a moving amount of the writing body equal to or larger than the pressing amount with a light force.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing the present invention.

FIG. 2 is an essential part cross-sectional view showing a cam portion of the barrel.

FIG. 3 is a perspective view of a main part showing a cam unit.

FIG. 4 is a longitudinal sectional view showing an operation state.

FIG. 5 is a longitudinal sectional view showing an operation state.

FIG. 6 is a vertical sectional view of a main part showing a second example.

FIG. 7 is a vertical sectional view of a main part showing an operation state of a second example.

FIG. 8 is a longitudinal sectional view of a main part showing a third example.

FIG. 9 is a longitudinal sectional view of a main part showing an operation state of a third example.

[Explanation of symbols]

 Reference Signs List 1 shaft cylinder 2 front shaft 3 rear shaft 4 sharp pencil unit 5 front member 6 front inclined surface 7 inclined surface 8 bending member 9 bending portion 10 receiving portion 11 moving piece 12 clip 13 core tank 14 eraser 15 through hole 16 joint Member 17 Chuck body 18 Outer shaft 19 Base 20 Chuck spring 21 Chuck ring 22 Core detent member 23 Cam mechanism 24 First projection 25 Cam groove 26 Second projection 27 Shallow groove 28 Inclined surface 29 Inclined surface 30 Projection 31 Tooth portion 32 Reduced diameter portion 33 Stepped portion 34 Angled inclined surface 35 Rotor 36 Projected portion 37 Outer peripheral protrusion 38 Inclined surface 39 Refraction member 40 Piece 41 Rear shaft 42 Inclined surface 43 Pressing member 44 Shaft cylinder 45 Bottom 46 Incline 47 Refraction member 48 Refraction member 49 Inclined surface 50 Receiving part

Claims (1)

[Claims] 1. A writing tool in which a writing body is slidably disposed inside a barrel and the writing body is arranged to be able to protrude and retract from the barrel, and a pressing member for pushing the writing body forward on the barrel. And one between the pressing member and the cursive
A retractable writing instrument, comprising: two refracting members, wherein the refracting members are extended by a pressing operation of the pressing member and an inner surface of the barrel or an inclined surface provided on the pressing member.