JPH09300881A - Extending and contracting type writing utensil - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an extending and contracting type writing utensil, in which the writing tip of a refill projects beyond the tip of a shaft tube and retracts from its tip by extending and contracting a slide tube. SOLUTION: At the back part of a shaft tube 1, a slide tube 6 is attached slidably. In the shaft tube 1, a ball pen refill 4 is housed movably axially. At the back part of the refill 6, a magnet 12 is attached. Within the slide tube 6, an attracting piece 13 for being attracted to the magnet 12. When the slide tube 6 is contracted, by means of the magnet 12 and the attracting piece 13, the refill 6 is moved to its retreated position, resulting in retracting the writing tip in the shaft tube 1. When the slide tube 6 is extended, the attracting action of the magnet 12 is lost, the refill 4 moves by its own weight to its advanced position, resulting in projecting the writing tip beyond the shaft tube 1. Under the state just mentioned above, the refill 4 inclines slightly, resulting in engaging the refill with the step part 15 of the shaft tube 1 so as to withstand against the pressure of the writing action. At the moving of the refill to its retreated position, the inclination of the refill 4 is corrected so as to allow to retreat.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a writing instrument such as a ball-point pen and the like.

[0002]

2. Description of the Related Art A writing instrument capable of extending or contracting its axial length and a writing instrument provided with a refill such as a ball-point pen which can be retracted from the tip of a barrel by a knocking operation or a rotating operation are known. However, many of them have complicated configurations and are economically difficult to obtain.

[0003]

DISCLOSURE OF THE INVENTION According to the present invention, the writing tip of the refill projects from the tip of the barrel when the shaft length is extended, and the writing tip of the refill is sunk into the barrel when the shaft length is shortened. It is an object of the present invention to provide a telescoping writing instrument having a simple structure.

[0004]

According to the present invention, a slide cylinder is slidably fitted to a rear portion of an axial cylinder in which a refill is movably accommodated in an axial direction, and the rear portion of the refill and the slide cylinder. When a magnet and an attraction piece that can be attracted by a magnetic action are provided inside the slide cylinder and the slide cylinder is slid in the contracting direction, the refill is attracted by the magnetic action and moves to the retracted position, and the tip of the writing is When the refill is retracted into the shaft cylinder and the slide cylinder is slid in the extending direction, the magnetic action of the refill disappears and the refill can be moved to the forward position, and is held by the holding means at the forward position. The above-mentioned object is achieved by providing a retractable writing instrument in which the pen can project from the barrel and allow writing.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments will be described below with reference to the drawings. In the figure, a barrel (1) has a barrel body (2) and a barrel tip (3) connected to the barrel body (2) by screwing, fitting, or any other suitable method. A refill (4) such as a pen is housed therein, and the refill (4) is at a forward position (Fig. 1) where the writing tip (5) projects from the barrel (1).
A) and a retracted position (FIG. 1B) that is retracted into the shaft cylinder so as to be movable in the axial direction.

A slide cylinder (6) is slidably fitted to the rear portion of the shaft cylinder (1). The slide tube (6)
Contracts until its front end edge (7) comes into contact with the step (8) formed on the tip of the barrel (3), and the inward locking edge (9) of the large diameter part has the barrel body (9). 1) Step formed on the rear part
(10) It can be extended to a position where it hits (Fig. 2A, Fig. 3).

Inside the holder (11) provided at the rear portion of the refill (4) and the slide cylinder (6), a magnet (12) and an attraction piece (13) which can be attracted by a magnetic action are provided. There is.
In the figure, the magnet (12) is fixed to the holder (11),
The adsorption piece (13) made of a magnetic material such as metal is fixed inside the slide cylinder (6), but the adsorption piece (1) is attached to the holder (11).
3) may be provided, and the magnet (12) may be provided in the slide cylinder (6), and the attraction piece (13) may be composed of a magnet.

The shaft (1) holds the refill (4) so as to withstand writing pressure in the forward position and is releasable so as to release the holding when moving to the backward position. Holding means for holding and a stopper for stopping the movement of the refill at the retracted position are provided. In the figure, the stopper (14) is a step portion formed in the barrel main body (2) so that the rear end of the holder (11) abuts.
Further, the holding means can be variously formed, but FIG.
In the embodiment shown in FIGS. 3A to 3C, when the refill (4) is slightly tilted and its axis deviates from the axis of the barrel, the holder (11) for the refill (4) is shown. Is a step (15) formed in the barrel so that the rear end of the step (1)
The engagement between 5) and the holder- (11) is released by returning the inclination of the holder- (11) in the direction in which the axis of the holder- (11) coincides with the axis of the barrel.

In order to return the inclination of the refill (4) to bring the refill shaft center in the axial direction of the shaft cylinder as described above, in the drawing, the inside of the slide cylinder (6) is Above magnet
Although the guide cylinder (16) that engages with (12) is provided so as to be attracted, if the magnetic action is strong, it can be attracted toward the center when the refill is attracted by the magnet, The guide tube (16) can be omitted.

FIG. 4 shows another embodiment of the holding means. In the figure, a notch portion (17) is formed in a part of the shaft cylinder body (2), and an engaging piece (19) having an engaging end (18) at the tip is elastically attached to the notch portion (17). It is provided so that it can be displaced.
When the slide tube (6) is extended, the locking piece
The protrusion (20) formed outside the (19) is the slide cylinder (6).
The engaging edge (18) is pushed into the barrel (1) by hitting the small diameter portion (21) of the shaft, and the rear end of the holder (11) of the refill (4) can be engaged. Yes (Figure 4A). On the other hand, when the slide cylinder (6) is contracted, the slide cylinder (6)
The protrusion (20) corresponds to the large-diameter portion (22) of the locking piece (19).
Returns to the outside, the locking edge (18) is disengaged from the inside of the barrel, and the holder (11) of the refill (4) can be released (Fig. 4B).

When the slide cylinder (6) is extended downward in use, the attraction of the refill (4) due to the magnetic action disappears, and the refill (4) is attached to the tip end (3) of the shaft cylinder. The rear end portion (23) falls to a position where the tip of the holder hits and moves to the forward position, and the rear end of the holder is held by the holding means to enable writing. In the figure,
This movement is carried out by the self-weight of the refill (4), but between the stopper (14) and the holder (11), a spring with a spring pressure weaker than the attraction force by the magnetic action (not shown) is used. )
May be provided to move the refill (4) to the forward position. In the embodiment shown in FIG. 1 and the like, in the forward position (FIGS. 1A and 2A), the refill (4) is slightly inclined and the holder (11) is locked to the step (15). , Can accept writing pressure. In the embodiment shown in FIG. 4, the locking piece (19) is pushed inward by the slide cylinder (6) to hold the rear end of the holder.

When the slide cylinder (6) is contracted, the guide cylinder (16) is first moved to the magnet (12) in the structure shown in the figure.
And attract the refill (4) to the center, and then the attracting piece (13) and the magnet (12) come close to each other to refill the refill (4).
(4) can be moved to the retracted position (Fig. 1
B, FIG. 2B). In the embodiment shown in FIG. 4, the locking piece (19) returns to the outside and the refill moves to the retracted position in a free state.

[0013]

Since the present invention is constructed as described above, the writing tip of the refill protrudes from the shaft cylinder when the slide cylinder is extended, and the refill is contracted when the slide cylinder is contracted.
Since the writing tip of the ball pen can be immersed in the barrel and a complicated cam mechanism etc. is not used as in the past, the structure is simple and economical to obtain. In addition, it can also be applied to a sharp pencil, an eraser, or a refill of an appropriate writing instrument.

[Brief description of drawings]

FIG. 1 is a half sectional view showing an embodiment of the present invention, in which (A) is a state where a slide cylinder is extended and (B) is a state where the slide cylinder is contracted.

2 shows an enlarged sectional view of a part of the embodiment shown in FIG.
(A) is an expanded state of the slide cylinder, and (B) is a contracted state of the slide cylinder.

FIG. 3 is an enlarged cross-sectional view of a part of a barrel body.

FIG. 4 shows another embodiment of the holding means, (A) is an expanded state and (B) is an enlarged sectional view in a contracted state.

[Explanation of symbols]

 1 shaft cylinder 2 shaft cylinder body 4 refill 6 slide cylinder 11 holder-12 magnet 13 adsorption piece 15 step 16 guide cylinder

Claims (3)

[Claims] 1. A refill is housed in a barrel so as to be axially movable between a forward position where a writing tip projects from the barrel and a retracted position where the writing tip is retracted, and the refill is used for writing pressure at the forward position. Holding means to hold the bearing so as to endure it and to release it when it moves to the retracted position and a stopper to stop the movement at the retracted position are provided, and the slide cylinder can slide on the rear part of the shaft cylinder. A retractable writing instrument which is fitted to the inside of the slide cylinder and provided on the inside of the slide cylinder and the rear portion of the refill with a magnet capable of attracting by magnetic action and an attraction piece. 2. The holding means is a stepped portion formed in the shaft cylinder so that the refill is locked when the shaft center of the refill deviates from the shaft center of the shaft cylinder, and the slide cylinder. The retractable writing instrument according to claim 1, further comprising a guide tube provided inside of the guide tube for displacing the axis of the refill toward the axis of the axis tube when the slide tube is contracted. 3. The holding means is an elastic locking piece formed on the shaft cylinder so as to be pushed into the shaft cylinder by the slide cylinder and lock the refill when the slide cylinder is extended. The retractable writing instrument according to Item 1.