JPH0615730Y2 - Telescopic writing instrument - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] In the present invention, when writing, the writing portion protrudes from the tip of the shaft, and the shaft length extends to a length that is easy to grasp, which is convenient and when not writing. Relates to a telescopic writing instrument in which the writing section is retracted inside the shaft and the axial length is shortened compactly, which is convenient for carrying.

[Conventional technology]

A conventional example of this type of retractable writing instrument is Japanese Patent Laid-Open No. 60-
Telescopic ballpoint pen presented in 199699,
Although there is a ballpoint pen described in Japanese Utility Model Publication No. 47-5660, the former telescoping ballpoint pen has a built-in magnet for fixing in a state where the axial length is shortened. Has a drawback that it adversely affects the magnetic card, and the latter ball-point pen has a drawback that it cannot take a sufficient expansion / contraction stroke because it uses a swing cam to expand / contract the axial length. .

[Problems to be solved by the invention]

An object of the present invention is to provide an extendable writing instrument which does not have the drawbacks of the conventional example, and does not change the position of the clip due to the extension and contraction of the shaft length and does not impair the appearance and usability.

[Means for solving problems]

The telescopic writing instrument of the present invention devised to achieve the above object has a lead tube attached to a shaft tube so as to be rotatable in the circumferential direction and immovable in the axial direction, and a vertical groove formed in the shaft tube in the axial direction. By providing a protrusion on the slider and inserting the protrusion in the vertical groove, the slider is mounted on the shaft cylinder so as not to rotate in the circumferential direction and movable in the axial direction in conjunction with the writing body,
A cap fixed with a clip is attached to a shaft cylinder so as to be movable in the axial direction and non-rotatable in the circumferential direction, and is attached to one part of the lead cylinder or the cap itself or an inner cylinder fixed to the cap with respect to the axial direction. Second slant groove slanted with respect to the axial direction on one part of the lead tube or slider, and the other part is provided with a first protrusion movably fitted in the first slant groove. And a second protrusion that is movably fitted in the second oblique groove is provided on the other part, and the first protrusion is formed by moving the cap forward or backward with respect to the shaft cylinder.
The relative movement of the second oblique groove and the second protrusion that accompanies the rotation of the lead tube caused by the relative movement of the oblique groove and the first protrusion causes the writing portion of the cursive body to move to the tip of the pen in conjunction with the extension of the axial length. It is characterized in that it can be projected from the end opening and that the writing part of the writing body can be immersed in the shaft in conjunction with the shortening of the shaft length.

〔Example〕

One embodiment of the present invention shown in the figure is that the inner surface of the rear end of the barrel (1) is
A circumferential groove (2) in the circumferential direction and a vertical groove (3) in the axial direction are provided,
Insert the collar (5) provided on the outer surface of the front end of (4) into the circumferential groove (2).
The lead tube (4) cannot move axially with respect to the shaft tube (1).
Is rotatably mounted in the circumferential direction, and the slider (6)
Fit the protrusion (7) provided on the outer surface of the front end of the into the vertical groove (3) of the barrel (1).
And slide the slider (6) around the cylinder (1) in the circumferential direction.
It is non-rotatable but mounted so that it can move in the axial direction, and
A ballpoint pen refill (8) as a cursive body
It is stored in a state in which it is biased rearward by the spring (9)
Keep the rear end in contact with the slider (6), while
Attach the cap (11) with the inner cylinder (10) firmly attached to the outer surface of the latter half of the shaft cylinder (1).
In the axial groove (21) on the inner surface of the cap (11).
By inserting the rib (22) provided on the outer surface of the tube (1),
Mounted so that it can move in the axial direction but cannot rotate in the circumferential direction
However, on the outer surface of the lead tube (4) described above, the axial component and the circle
Has a circumferential component, that is, the required angle of inclination with respect to the axial direction
The first inclined groove (12) is formed and the vicinity of the front end of the inner cylinder (10)
Provide the first protrusion (13) on the inner surface of the lead tube (4)
The first projection (13) is inserted into the inner surface of (10).
Is movably fitted in the first oblique groove (12), and the lead tube is
In (4), as shown in FIG. 3 and FIG.
Inclined in the opposite direction to the groove (12) and the circumferential component is the first
It is the same as the groove (12) (D and d in Fig. 3 are the same) and at the front end
Second having a short lateral groove (14) substantially perpendicular to the axial direction
If the diagonal groove (15) is opened from the outer surface to the inner surface,
On the outer surface of the rear end of the slider (6) described above, the second protrusion (1
6) and insert the slider (6) into the inner surface of the lead tube (4).
To move the second protrusion (16) to the second oblique groove (15)
It is freely inserted, and the axial component of the first oblique groove (12) (the third
(Length of H in the figure) is equal to the expansion / contraction stroke of the required shaft length.
And the axial component of the second oblique groove (15) (the third
The length of h in the figure) is the required value of the ballpoint pen refill (8).
It is configured to be set equal to the appearance stroke.

[Action]

The operation will be described based on the above embodiment. Figure 1 shows the barrel
As shown in FIG. 3, the cap (11) is retracted relative to (1) and the axial length is extended. As shown in FIG. 3, the first protrusion (13) of the inner cylinder (10) is shown.
Is located at the rear end of the first slant groove (12) of the lead cylinder (4), and the second protrusion (16) of the slider (6) is the second slant groove (15) of the lead cylinder (4). The ball-point pen refill (8) is fixed to the front groove of the base (18) so as to project the tip writing part (17) from the tip port (19) of the base (18). This state is of course a writing state. From this state, press the cap (11) forward and move the cap (11) forward with respect to the shaft cylinder (1).
Since the first protrusion (13) of (10) pushes the front wall of the first oblique groove (12), the lead tube (4) rotates in the direction of the arrow in FIG.
By the rotation of (4), the second projection (16) is retracted by the second oblique groove (15) of the lead tube (4), the slider (6) is retracted, and at the same time, the coil spring (9) attaches it backward. The energized ballpoint pen refill (8) retreats according to the slider (6), and finally the first protrusion (13) becomes the first oblique groove as shown in FIG.
At the front end of (12) and the second protrusion (16) is located at the rear end of the second oblique groove (15), the axial length is shortened by the axial component of the first oblique groove (12). Ballpoint pen refill (8) tip writing part (1
7) is retracted by the axial component of the second bevel groove (15) and the base (1
Immerse inside 8). When the cap (11) is pulled rearward with respect to the barrel (1), the state shown in FIGS. 1 and 3 is restored. Shaft cylinder
In contrast to (1), the cap (11) moves only in the axial direction and does not rotate in the circumferential direction.Therefore, the position of the clip (20) attached to the cap (11) when the axial length is shortened and when the axial length is extended. Does not change.

Although the inner cylinder (10) is fixed to the cap (11) and the first protrusion (13) is provided on the inner cylinder (10) in the above embodiment, the first protrusion is directly attached to the cap itself. Even if (13) is provided, the operation does not change. Further, in the above embodiment, the lead tube (4) has the first oblique groove.
(12) and the second slanted groove (15) are provided side by side, and the inner tube (10) has the first protrusion.
The slider (6) is also provided with the second protrusion (16), but the first slant groove is used as the lead cylinder, the first protrusion is used as the inner cylinder,
The second oblique groove is provided on the slider and the second projection is provided on the lead cylinder, or the first oblique groove is provided on the inner cylinder, the first projection is provided on the lead cylinder, and the second oblique groove is provided on the lead cylinder. The second protrusion on the slider, or the first oblique groove on the inner cylinder, the first projection on the lead cylinder, the second oblique groove on the slider, and the second projection on the lead cylinder. It is also possible to provide each of them.

[Effect of device]

The present invention is as described above, and has an effect of solving the drawbacks of the conventional example. Further, since the position of the clip does not change when the axial length is extended and when the axial length is shortened, the appearance is not deteriorated and the writing is not disturbed. Further, the expansion / contraction stroke of the axial length and the curving stroke of the cursive body are arbitrarily set by changing the axial lengths of the first oblique groove and the second oblique groove and the positions of the first protrusion and the second protrusion, respectively. There is a design advantage that it can. or,
Since the axial cylinder is provided with an axial vertical groove and the slider is provided with a projection, and the projection is fitted in the vertical groove, the slider can move in the axial direction without being rotatable in the circumferential direction with respect to the axial cylinder. There is an advantage that the number of parts can be reduced by eliminating the need for other parts for blocking the rotation of the slider.

[Brief description of drawings]

FIG. 1 shows an embodiment of the present invention. FIG. 1 is a side view showing a cross section of the upper half of the shaft with its axial length extended, and FIG. 2 shows the upper half of the shaft with its axial length shortened. A side view in section, FIG. 3 is a developed plan view of the lead cylinder in a state where the axial length is extended,
FIG. 4 is a developed plan view of the lead tube with the axial length shortened. (1) …… Shaft cylinder, (2) …… circumferential groove, (3) …… vertical groove, (4) …… lead cylinder, (5) …… flange, (6) …… slider, (7) …… Protrusion, (8) …… Ballpoint pen refill, (9) …… Coil spring, (10) …… Inner cylinder, (11) …… Cap, (12) …… First oblique groove, (13)… … First protrusion, (14) …… Side groove, (15) ……
Second oblique groove, (16) …… Second protrusion, (17) …… Writing part, (1
8) …… Base, (19) …… Tip, (20) …… Clip, (21)
…… Groove, (22) …… Rib.

Claims (1)

[Scope of utility model registration request] 1. A lead cylinder is mounted on a shaft cylinder so as to be rotatable in the circumferential direction and immovable in the axial direction, and a vertical groove is provided on the shaft cylinder in the axial direction and a protrusion is provided on the slider, and the vertical groove is provided in the vertical groove. By inserting the protrusion, the slider cannot be rotated in the circumferential direction and is movably mounted in conjunction with the writing body in the axial direction, and the cap with the clip fixed to the axial cylinder can be moved in the axial direction. A first inclined groove that is inclined relative to the axial direction is provided in one component of the lead cylinder or the cap itself or the inner cylinder that is fixed to the cap, and is assembled in a non-rotatable manner in the circumferential direction, and the other component is provided with the first inclined groove. A first protrusion that is movably fitted in the inside is provided, a second slant groove that is inclined with respect to the axial direction is provided in one component of the lead tube or the slider, and the other component is moved into the second slant groove. A second protrusion that can be freely inserted is provided on the barrel. The extension of the axial length is interlocked by the relative movement of the second inclined groove and the second protrusion accompanying the rotation of the lead tube caused by the relative movement of the first inclined groove and the first protrusion due to the forward or backward movement of the cap. An extendable writing instrument characterized in that the writing part of the writing body can be projected from the tip of the shaft, and the writing part of the writing body can be immersed in the shaft in conjunction with the shortening of the shaft length.