JP3208558B2 - Telescopic writing instrument - Google Patents

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, which has an extendable shaft length and a writing tip which can be protruded and retracted from the tip of a barrel.

[0002]

2. Description of the Related Art There has been known a writing implement capable of extending and contracting an axial length, and a writing implement provided with a refill such as a ballpoint pen which can be protruded and retracted from the tip of a shaft cylinder by a knocking operation or a rotating operation. However, many of them are complicated and economically difficult to obtain.

[0003]

According to the present invention, the writing tip of the refill protrudes from the tip of the barrel when the shaft length is extended, and the writing tip of the refill is immersed in the barrel when the shaft length is reduced. It is an object of the present invention to provide a telescopic writing instrument having a simple configuration.

[0004]

According to the present invention, a slide cylinder is slidably fitted to a rear portion of a shaft cylinder in which a refill is accommodated so as to be movable in an axial direction, and a magnetic field is provided between the rear portion of the refill and the inside of the slide cylinder. When the slide cylinder is slid in the contracting direction by providing a magnet and an attraction piece that can be attracted by the action, the refill is attracted by the magnetic action and moves to the retreat position, and the writing tip of the refill enters into the shaft cylinder. When the slide cylinder is slid in the extension direction, the refill can lose its magnetic effect and move to the forward position.
A telescopic writing instrument is provided, which is held by a step formed in a barrel and allows a writing tip to protrude from the barrel to allow writing, thereby achieving the above object.

[0005]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 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 appropriate method. A refill (4) such as a pen is stored in the advancing position (FIG. 1) where the writing tip (5) projects from the barrel (1).
A) and a retracted position (FIG. 1B) that is immersed in the shaft cylinder so as to be movable in the axial direction.

A slide tube (6) is slidably fitted to the rear portion of the shaft tube (1). The slide cylinder (6)
Is contracted to a position where its front edge (7) hits a step (8) formed at the tip (3) of the barrel, and the inner locking edge (9) of the large-diameter portion is fitted to the barrel body ( 1) Step formed at the rear
(10) It can be extended to the position corresponding to (FIGS. 2A and 3).

A magnet (12) and a suction piece (13) capable of being attracted by magnetic action are provided inside the holder (11) provided at the rear of the refill (4) and the slide cylinder (6). It is.
In the figure, a magnet (12) is fixed to the holder (11),
A suction piece (13) made of a magnetic material such as metal is fixed inside the slide cylinder (6), and the suction piece (1) is attached to the holder (11).
3) may be provided, and the magnet (12) may be provided on the slide cylinder (6), or the attraction piece (13) may be constituted by a magnet.

In the barrel (1), the refill (4) is held in a forward position so as to withstand writing pressure, and is releasably held so as to release the holding when moving to the retracted position. A step portion 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 formed in the barrel body (2) such that the rear end of the holder (11) abuts. The releasably holding stepped portion is provided with a holder (1) for the refill (4) when the refill (4) is slightly inclined and its axis deviates from the axis of the barrel.
1) A step (1) formed in the barrel so that the rear end engages
5), the engagement between the step (15) and the holder (11) is released when the inclination of the holder (11) is returned to a direction in which the axis of the holder (11) coincides with the axis of the barrel.

As described above, in order to return the inclination of the refill (4) to shift the refill axis in the axial direction of the barrel, in the drawing, the inside of the slide barrel (6) is The above magnet
Although the guide cylinder (16) engaging with (12) is provided to draw, if the magnetic action is strong, the refill can be pulled toward the center when the refill is attracted by the magnet, The guide tube (16) may be omitted.

[0010]

In use, when the slide cylinder (6) is extended downward, the suction of the refill (4) by the magnetic action disappears, and the refill (4) is attached to the rear end of the shaft cylinder tip (3). The holder is dropped to a position where the leading end of the holder hits (23) and moves to the forward position, and the rear end of the holder is held by the step (15) to enable writing. In the drawing, this movement is performed by the weight of the refill (4), but the stopper (14) and the holder (1
Between 1), a spring (not shown) having a spring pressure weaker than the attraction force by the magnetic action may be provided to move the refill (4) to the forward position. Shown in FIG. 1 and the like
Thus , in the forward position (FIGS. 1A and 2A), the refill (4) is slightly tilted and the holder (1) is tilted.
1) is locked to the step (15), and can receive pen pressure.

When the slide cylinder (6) is contracted, the guide cylinder (16) fits into the magnet (12) and draws around the refill (4) as shown in FIG. The refill (4) can be moved to the retracted position by the close proximity of the suction piece (13) and the magnet (12) (FIGS. 1B and 2B).

[0013]

Since the present invention is constructed as described above, the writing tip of the refill projects from the shaft cylinder when the slide cylinder is extended, and the refill is formed when the slide cylinder is contracted.
The writing tip of the ball can be immersed in the barrel, and a complicated cam mechanism or the like is not used unlike the prior art, so that the structure can be obtained simply and economically, and the refill of the ball pen can be obtained. In addition, the present invention can be applied to a refill for a sharp pencil, an eraser, or any other suitable writing implement.

[Brief description of the drawings]

FIGS. 1A and 1B show one embodiment of the present invention, in which FIG. 1A is a half sectional view of a state where a slide cylinder is extended, and FIG.

2 shows an enlarged sectional view of a part of the embodiment shown in FIG. 1,
(A) shows an extended state of the slide cylinder, and (B) shows a contracted state of the slide cylinder.

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

[Explanation of symbols]

 1 Shaft tube 2 Shaft tube body 4 Refill 6 Slide tube 11 Holder 12 Magnet 13 Suction piece 15 Step 16 Guide tube

Claims (2)

(57) [Claims] 1. A refill is stored in a barrel so as to be axially movable between a forward position where a writing tip protrudes from the barrel and a retracted position where the writing tip protrudes from the barrel, and holds the refill so as to withstand writing pressure in the forward position. axis of the refill so as to release the holding when moving to the retracted position is formed in the shaft cylinder of the step portion the refill is engaged when off from the axis of the shaft tube while, refill at the retracted position A stopper for stopping the movement of the shaft cylinder is provided, a slide cylinder is slidably fitted to the rear part of the shaft cylinder, and a magnet and a suction piece capable of being attracted by magnetic action are provided inside the slide cylinder and at the rear part of the refill. Telescopic writing instrument. 2. The telescoping type according to claim 1, wherein a guide tube is provided inside the slide tube for moving the axis of the refill toward the axis of the shaft tube when the slide tube is contracted. Writing implement.