JP3803826B2 - Writing instrument with eraser - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a ballpoint pen that can be erased with an eraser, a mechanical pencil, and other writing instruments with an eraser.
[0002]
[Prior art]
In the case of a knock-type mechanical pencil, etc., various types of eraser feeding mechanisms using screw pairs are provided at the rear of the shaft cylinder so that the necessary amount of eraser can be fed out, but in the case of a ballpoint pen, Since the eraser is fixed to a cap or the like, it can be replaced with a replacement eraser if it can be exchanged when worn out, but if it cannot be replaced, it can no longer be used. Further, in the case of the eraser feeding mechanism using the screw pair as described above, the eraser is fed out and inconvenient when the rotation operation unit rotates due to vibration or impact during carrying. In addition, in the case of a ballpoint pen, it is necessary to provide means for preventing the writing tip from drying, but if the drying preventing portion is provided in the cap independently, the structure of the cap becomes complicated and not economical.
[0003]
[Problems to be solved by the invention]
The problem to be solved by the present invention is that, in a writing instrument such as a ballpoint pen with an eraser provided with an eraser on the cap, the eraser can be extended and used even if the eraser is worn away by use, and the eraser can be erased even if the rotary operation unit is rotated except when necessary. It is to provide a writing instrument with an eraser so as to prevent spilling out.
[0004]
Another object of the present invention is to provide a writing instrument with a ballpoint pen refill in a shaft tube, which has a pay-out type eraser and can be easily provided with a means for preventing drying at the writing tip. Is to provide.
[0005]
[Means for Solving the Problems]
Various configurations have been proposed for the eraser feeding mechanism of the type in which the eraser is fed out using the fixed side member and the rotating side member that are paired with screws, but basically the fixed side member and the rotating side member are screwed together. When the rotation side member is rotated, the stationary side member or the rotation side member is linearly moved to feed out the eraser. Therefore, when the rotating side member is rotated, if the stationary side member is also rotated together, the rotational motion cannot be converted into a linear motion, and the eraser cannot be fed out.
[0006]
The present invention pays attention to the structure of the eraser feeding mechanism of the above type, and when it is not necessary to feed out the eraser, the fixed side member and the rotating side portion are rotated together. The stationary member is prevented from rotating and the eraser can be fed out.
[0007]
That is, according to the present invention, in the writing instrument with an eraser, which is provided with an eraser feeding mechanism of a type that feeds out the eraser using the fixed side member and the rotating side member that are paired with the screw, and the cap is fitted to the shaft cylinder. The fixed side member of the eraser feeding mechanism is rotatably provided on the cap and its inner end protrudes inward of the cap. When the cap is fitted to the rear portion of the shaft tube, the fixed side member is engaged with the fixed side member. Thus, a writing instrument with an eraser is provided in which a rotation stopper is provided at the rear end of the shaft cylinder so as to prevent the rotation of the fixed side member. In this writing instrument with an eraser, when the cap is fitted to the tip of the shaft tube, the fixed side member is rotatable, so the eraser cannot be fed out even if the rotating side member is rotated. When the cap is fitted to the rear part of the cylinder, the rotation of the fixed side member is prevented, so that the eraser can be fed out, thereby solving the above problem.
[0008]
Further, according to the present invention, in the writing instrument with an eraser, a ballpoint pen refill is accommodated in the shaft tube, and when the cap is fitted to the tip of the shaft tube on the inner end of the fixed side member, The writing instrument with an eraser is provided, which is provided with an elastic air tight for preventing the writing tip from being dried when hitting the writing tip of the ball-point pen refill.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Various configurations of an eraser feeding mechanism of a type that feeds out an eraser by using a fixed-side member and a rotating-side member that are paired with screws are conventionally known, and the present invention can be applied to most of the mechanisms. Further, although it can be applied to a writing instrument such as a knock type mechanical pencil, it is preferably applied to a writing instrument such as a ballpoint pen.
[0010]
1 to 3 show a writing instrument in which a ball pen refill (2) is housed in a shaft tube (1), and a cap (4) having a clip (3) is provided on the shaft tube (1). It is detachably fitted. The cap (4) is provided with an eraser feeding mechanism using a screw pair having a rotary screw (5) as a fixed side member and a rotary cylinder (6) and an eraser (7) as a rotary side member. .
[0011]
The rotary screw (5) has a neck portion (9) on the inner end (8) side, and the neck portion (9) is fitted into the hole (11) of the cap body (10), thereby the cap body ( 10) is rotatably attached, and a screw thread portion (13) is provided on the inner surface of the rear cylindrical portion (12). On the inner end side, an elastomer, soft plastic, synthetic rubber or other elastic air tight (14) is provided. In the figure, the air tight (14) is formed separately from the rotary screw and then attached to the inner end, but at the time of molding the rotary screw, the rotary screw is subjected to two-color molding, insert molding, etc. It can also be integrally molded.
[0012]
An engagement receiving portion (16) is provided at the inner end (8) of the rotary screw (5) so as to engage with a rotation stop portion (15) provided at the rear end of the shaft tube (1). . In the figure, the rotation stopper (15) is formed in the shape of a protruding piece extending on both sides, so that the engagement receiving portion (16) is formed in a cutout groove shape correspondingly. These shapes can be formed into appropriate shapes that exert the effect of rotation prevention, for example, the engagement receiving portion is formed as a projecting piece and the rotation prevention portion is formed as a recess, or both are polygonal in cross section or irregular cross section You may make it form and fit in.
[0013]
The eraser (7) is inserted into the cylindrical part (12) of the rotary screw (5) and has a thread groove (17) engaged with the screw thread part (13) on the peripheral surface and a receiving groove extending in the axial direction. (18) is formed.
[0014]
The rotating cylinder (6) having the clip (3) has an engagement piece (19) that engages with the receiving groove (18), and is rotatably provided on the outer periphery of the rotating screw (5). . In the drawing, a concave groove (20) is provided on the inner surface of the rotary cylinder (6), and the concave groove (20) is engaged with a raised portion (21) provided on the outer periphery of the rotary screw (5) so as to be rotatable. Although it is attached, the concave groove and the raised portion may be provided on the opposite member, or the rotary cylinder (6) may be directly attached to the cap body (10) so as to be freely rotatable.
[0015]
With the above configuration, when the cap (4) is fitted to the tip of the shaft tube (1), as shown in FIGS. 1 (A) and 3 (A), the writing tip (2a) of the ballpoint pen refill is used. Falls on the air tight (14), and the air tight (14) prevents drying. In this state, since the rotary screw (5) is rotatable, even if the rotary cylinder (6) is rotated, it cannot rotate with the rotary cylinder (6) to feed out the eraser (7). .
[0016]
When the cap (4) is fitted to the rear part of the shaft cylinder (1), as shown in FIGS. 3 (B) and 3 (C), the rotation receiving part (15) is engaged with the engagement receiving part of the rotary screw (5). (16) engages and the rotational movement of the rotary screw (5) is prevented. Accordingly, when the rotating cylinder (6) is rotated in this state, the eraser (7) rotates through the engagement piece (19) and the receiving groove (18) and at the same time, the thread groove (17 of the eraser (7)). ) Is engaged with the screw thread portion (13) of the rotary screw (5), so that it can move in the axial direction and be fed out from the cylindrical portion (12) of the rotary screw (5).
[0017]
4 and 5 show an embodiment in which the present invention is applied to another eraser feeding mechanism. In the figure, only the cap (4) is shown, and the cap is provided with a rotating sleeve (22) as a stationary member and a rotating cylinder (23) as a rotating member.
[0018]
The rotating sleeve (22) accommodates an eraser (24) inside, has a window portion (25) extending in the axial direction on the peripheral surface, and is rotatably provided in the cap. In the figure, a screw cylinder (23) having a clip (3) rotatably connected to a cap body (10) by a concave groove or a raised portion (not shown) and fixed to the rotary cylinder (23). The neck (27) of the rotating sleeve (22) is rotatably attached to 26), but may be attached to the cap body (10) so as to be freely rotatable.
[0019]
In the rotating sleeve (22), there is provided an eraser cradle (28) for holding the bottom of the eraser (24), and the eraser cradle (28) is fitted to the window (25) to be attached to the shaft. A screw thread portion (29) protruding outward is provided on the outer periphery.
[0020]
The rotating cylinder (23) is rotatably provided on the cap body (10), and a thread groove (30) is formed on the inner surface to engage with a screw thread portion (29) of the cradle (28). . The screw groove (30) can be formed directly on the rotary cylinder (23), but in the embodiment shown in the figure, a screw cylinder (26) having a screw groove (30) is formed, and the screw cylinder (26 ) Is fixed in the rotary cylinder (23) by press fitting, adhesion, concave / convex engagement or other appropriate means.
[0021]
The inner end (31) of the rotating sleeve (22) is provided with an integral or separate elastic air tight (32) in substantially the same manner as in the above embodiment, and the rotation provided at the rear end of the shaft cylinder. An engagement receiving portion (34) that engages with the stop portion (33) is provided. As described above, the rotation stop portion (33) and the engagement receiving portion (34) can be formed in an appropriate shape that provides a detent effect.
[0022]
When the cap (4) is fitted to the tip of the shaft cylinder with the above configuration, the writing tip (2a) of the ballpoint pen refill (2) is brought into contact with the air tight (32) to prevent drying. In this state, since the rotating sleeve (22) is rotatable, the eraser (24) is not fed out even if the rotating cylinder (23) is rotated.
[0023]
When the cap (4) is fitted to the rear part of the shaft cylinder and the engagement receiving part (34) of the rotation sleeve (22) is engaged with the rotation stopper (33), the rotation of the rotation sleeve (22) is reduced. Be blocked. Therefore, when the rotating cylinder (23) is rotated, the eraser cradle (28) slides in the axial direction via the thread groove (30) and the screw thread portion (29), and the eraser (24) can be fed out. it can.
[0024]
In the above-described embodiment, an example of an eraser feeding mechanism using a screw pair has been described. However, it is apparent that the present invention can be appropriately applied to various screw pair-type eraser feeding mechanisms other than the above-described embodiments.
[0025]
【The invention's effect】
The present invention is configured as described above, and is provided with an eraser feeding mechanism of a type that feeds out an eraser using a fixed side member and a rotating side member that are paired with a screw, and the cap is fitted to the shaft cylinder. In the writing instrument, the fixed-side member of the eraser feeding mechanism is rotatably provided on the cap and its inner end protrudes inward of the cap. When the cap is fitted to the rear part of the shaft tube, the fixed-side member is engaged with the fixed-side member. Since the rotation stop portion is provided at the rear end of the shaft tube so as to prevent the rotation of the fixed side member, the fixed side member is the rotation side member when the cap is fitted to the front portion of the shaft tube. Therefore, the eraser cannot be drawn out even if it is subjected to vibration or impact during carrying.
[0026]
Then, when the cap is fitted to the rear part of the shaft cylinder, the rotation-stopping part prevents the stationary side member from rotating. Can be used.
[0027]
In addition, an elastic air tight can be provided at the inner end of the fixed side member, and when the cap is fitted to the tip of the shaft tube, the writing tip of the ball pen refill touches the air tight. It is possible to prevent the tip from being dried.
[Brief description of the drawings]
FIG. 1 shows an embodiment of the present invention, in which (A) is a front view of a cross-section of a cap, and (B) is a side view.
FIG. 2 is an exploded perspective view of a cap portion.
3A is a diagram illustrating a state in which a cap is fitted to a front portion of a shaft cylinder, and FIGS. 3B and 3C are explanatory diagrams illustrating a state in which the cap is fitted to a rear portion of the shaft cylinder.
FIG. 4 is a cross-sectional view showing another embodiment.
5 is an exploded perspective view of the embodiment shown in FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Shaft cylinder 2 Ball-point pen refill 4 Cap 5 Rotating screw 6 Rotating cylinder 7 Eraser 8 Inner end 13 Screw thread part 14 Air tight 15 Anti-rotation part 16 Engagement receiving part 17 Screw groove 18 Receiving groove 19 Engaging piece 22 Rotating sleeve 23 Rotation Tube 24 Eraser 25 Window portion 28 Eraser base 29 Screw screw portion 30 Screw groove 32 Air tight 33 Anti-rotation portion 34 Engagement receiving portion

Claims (3)

  In a writing instrument with an eraser, in which a cap is provided with an eraser feeding mechanism of a type that feeds out an eraser using a fixed side member and a rotating side member that are paired with a screw, and the cap is fitted to the shaft tube, the fixed side of the eraser feeding mechanism A member is rotatably provided on the cap and its inner end protrudes inward of the cap. When the cap is fitted to the rear part of the shaft cylinder, the fixed side member is engaged to rotate the fixed side member. An anti-rotation portion is provided at the rear end of the shaft cylinder so as to prevent it, a ballpoint pen refill is accommodated in the shaft cylinder, and the cap is fitted to the front end of the shaft cylinder on the inner end of the fixed side member At the time, a writing instrument with an eraser provided with an elastic air tight that prevents the writing tip from being dried against the writing tip of the ballpoint pen refill.   The eraser feeding mechanism includes a rotary screw having a screw thread portion on an inner surface and provided rotatably, a screw groove inserted into the rotary screw and engaged with the screw screw portion, and a receiving groove extending in the axial direction. A rotating cylinder having an eraser and an engaging piece that is rotatably provided on the outer periphery of the rotating screw and engages with the receiving groove, and is provided at the inner end of the rotating screw at the rear end of the shaft cylinder. The writing instrument with an eraser according to claim 1, wherein an engagement receiving portion that engages with a stop portion and the air tight are provided.   The eraser feeding mechanism includes a rotating sleeve having a window portion extending in the axial direction on a peripheral surface and rotatably provided therein, and a screw provided in the rotating sleeve and protruding outward from the window portion. An eraser cradle that has a threaded portion and holds the eraser; and a rotating cylinder that is rotatably provided on the outer periphery of the rotating sleeve and has a thread groove that engages with the screw threaded portion of the cradle. The writing instrument with an eraser according to claim 1, wherein an engagement receiving portion that engages with a rotation stopper provided at a rear end of the shaft tube and the air tight are provided at one end.

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