JP2000043478A - Retracting and extending type writing utensil - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a retracting and extending type writing utensil, which has a good productivity and is equipped with the centering function of a refill at the projection of a pen point needless to say no presence of the looseness of the pen point at writing. SOLUTION: On the inner surface near a tip hole 2a, looseness preventing parts 1a for preventing a pen point 3a from loose moving by contacting with a refill 3 are integrally formed so as to prevent the pen point 3a from loose moving through the contact of the refill with the inner surface near the tip hole 2a. Since the looseness preventing parts 1a are formed integrally, the number of parts become small and the structure of a writing utensil becomes simple, resulting in reducing the assembling man-hour at its manufacture and no failure such as the getting out of place of the looseness preventing parts 1a or the like develops.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a writing instrument,
More particularly, the present invention relates to an in-and-out type writing instrument in which a pen tip can be made to appear and disappear by a mechanism for feeding out a refill.

[0002]

2. Description of the Related Art A retractable writing instrument is configured such that a refill is advanced and retracted in a direction of a barrel by a feeding mechanism in a barrel, and a pen tip is made to protrude and retract from a tip end of a tip provided at a tip of the barrel. . By the way, this retractable writing instrument is formed such that the inner diameter of the tip is slightly larger than the outer diameter of the pen tip in order to allow the pen tip to protrude and retract from the tip end smoothly. A gap is formed between the surface and the outer peripheral surface of the pen tip, causing a problem that the pen tip rattles during writing and handwriting is disturbed. However, in order to solve this problem, a small-diameter cylindrical body that is in sliding contact with the outer peripheral surface of the pen tip is incorporated in the tip end of the tip of the barrel so as to prevent rattling of the pen tip (actually). Kaihei 5-13
790).

[0003]

However, the retractable writing instrument to which the above-mentioned cylinder for preventing backlash is attached has a large number of parts and is cumbersome to assemble because the cylinder is a small separate member. And may cause defective products due to forgetting to assemble the cylinder or dropping out. In addition, there is a concern that the cylindrical body may come off and move together with the pen tip when the pen tip is moved in and out. Also, in the standard refill, the end of the ink storage tube is expanded when the ink storage tube is fitted to the pen tip, so that a step is formed at the connection point between the pen tip and the ink storage tube, If the axis of the refill does not completely coincide with the axis of the barrel due to manufacturing variations or the like, the step may be caught in the front end or inside the barrel and hinder the pen tip from protruding.

The present invention has been made in view of the above-mentioned conventional circumstances, and the object thereof is not only to prevent rattling of the pen tip at the time of writing, but also to improve productivity and to reduce the pen tip. An object of the present invention is to provide a retractable writing instrument having a refill centering function when protruding.

[0005]

As a technical means of the present invention for achieving the above object, a first aspect of the present invention is to provide a rattle on an inner surface near a tip opening to prevent rattling of a pen point by contacting a refill. The gist is that the prevention part is integrally formed. The gist of the present invention is that the rattling prevention portion is a plurality of vertical protrusions extending in the axial direction. The inner surface near the distal end includes the inner surface near the distal end of the barrel and the inner surface of the leading end provided at the distal end of the barrel.

According to the above technical means, the present invention has the following effects. (Claim 1) An integrally formed rattling prevention portion prevents the pen tip from rattling by being in contact with the refill on the inner surface near the tip opening, and aligns the refill shaft with the shaft cylinder. . (Claim 2) Since the contact between the rattling prevention portion and the refill becomes a line contact with a small contact area by making the rattling prevention portion a vertical projection, the sliding resistance when the pen tip is protruded and retracted is reduced. .

[0007]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a retractable writing implement A according to an embodiment of the present invention. The retractable writing implement A is a barrel 1
And a refill 3 attached to the shaft cylinder 1 so as to be able to advance and retreat.
A feeding mechanism 5 incorporated in the upper portion of the barrel 1 to advance and retreat the refill 3 by operating the knock portion 7, and a front end 2 screwed to the tip of the barrel 1 so that the pen tip 3 a of the refill 3 appears and disappears. And a stopper member 6 screwed to the rear end of the barrel 1 to fix the clip portion 4 and to insert the knock portion 7.

The shaft cylinder 1 has a substantially elongated cylindrical shape molded from an opaque or transparent synthetic resin material or the like, and is in contact with the refill 3 on the inner peripheral surface near the tip to prevent rattling of the pen tip 3a. An attachment prevention portion 1a is integrally formed, and a hook portion 1b for hooking the feeding mechanism 5 is formed on the inner peripheral surface slightly above the intermediate portion.

The backlash preventing portion 1a is a vertical projection (hereinafter, denoted by reference numeral 1a) that protrudes from the inner peripheral surface near the tip of the barrel 1 and extends in the axial direction. The surface has a semicircular shape. A plurality of the rattling prevention portions 1a are provided at equal intervals on the same circumference, and the respective top portions are in contact with the outer peripheral surface of the ink storage tube 3b of the refill 3. Therefore, the contact between the vertical protrusion 1a and the ink containing tube 3b is in a line contact state at a plurality of locations. The height and the length of the vertical protrusion 1a in the axial direction are set so as to provide a contact resistance that does not prevent the refill 3 from moving forward and backward.

The refill 3 has a pen tip 3a, which rotatably holds a transfer ball 3c in a ball house, fitted to the tip of a cylindrical ink storage tube 3b made of synthetic resin or metal. The housing tube 3b is filled with ink. The rear end of the refill 3 is fitted to the feeding mechanism 5. Although the configuration of the refill 3 is a general one according to the prior art, the end of the ink container 3b is expanded when the ink container 3b is fitted to the pen tip 3a. A step 3d is formed at a connection point with the ink storage tube 3b.

The feeding mechanism 5 has a return spring 5a having a lower end hooked to a hook portion 1b in a tubular piece 5d fitted in the shaft cylinder 1, and presses the return spring 5a from above. A rotor 5b fitted with a rear end portion of the refill 3 and a knock shaft 5c engaged with the rotor 5b are provided, and a cap-like shape attached to the rear end portion of the knock shaft 5c is provided. This is a well-known technique for reciprocating the refill 3 by knocking the knock portion 7.

The feeding mechanism 5 includes a knocking portion 7
Is pushed, the rotor 5b rotates while moving forward and locks the pen tip 3a of the refill 3 at a position protruding from the tip end port 2a, and when the knock portion 7 is pushed again, the rotor 5b returns. It is configured to rotate while marching by the resilience of the spring 5a and to lock the pen tip 3a at a position where the pen tip 3a is accommodated in the tip opening 2.

The feeding mechanism 5 according to the present embodiment.
Applies the knock type as described above, but may be a rotary type in which the pen tip 3a is protruded and retracted from the tip opening 2 by a rotation operation.

The tip port 2 has an inverted conical shape in which a penetrating tip port 2a for allowing the pen tip 3a of the refill 3 to protrude and retract is formed inside. The front end port 2a has an ink storage tube 3 on the rear end side.
The tip end is formed slightly larger than the outer diameter of the pen tip 3a while being formed slightly larger than the outer diameter of b. That is, by the two-point support of the distal end side of the distal end opening 2a and the vertical projection 1a, the refill 3 is prevented from rattling and the shaft cylinder 1 is aligned with the shaft center.

The stopper member 6 penetrates the knock portion 7 so as to be reciprocally movable, and has a clip portion 4 provided on the side surface of the barrel 1.
Is screwed to the rear end of the shaft cylinder 1 so as to pinch and hold the upper end annular portion of the shaft cylinder 1.

The retractable writing implement of the present embodiment configured as described above has the following operational effects. The outer peripheral surface of the refill 3 uniformly contacts the plurality of vertical protrusions 1a near the tip in the barrel 1 to align the axis of the refill 3 with the axis of the barrel 1. Transfer ball 3
Even if c is pressed against the paper surface, the tip end side of the refill 3 is supported by the vertical protrusion 1a, so that the pen tip 3a does not rattle.
The step 3d formed at the connection point between the tip b and the pen tip 3a does not catch on the rear end side edge 2b of the front end opening 2a. Moreover, since the contact between the outer peripheral surface of the refill 3 and the vertical protrusion 1a is a line contact with a small contact area, the refill 3 is smoothly slid during the knocking operation to make the pen tip 3a protrude and retract. Further, since the vertical projection 1a is formed integrally with the barrel 1, the structure of the tip portion of the barrel 1 is simple and the number of parts is relatively small, so that defects such as the removal of the vertical projection 1a do not occur. Needless to say, the number of assembling steps during manufacturing is greatly reduced.

In the present embodiment, the vertical projection 1a is
Although provided on the inner peripheral surface of the shaft cylinder 1, it may be provided on the inner peripheral surface of the front end 2. In addition, the vertical projections 1a are formed in a plurality of semicircular cross-sections at the tip end, but if the contact resistance with the refill 3 is reduced so as not to hinder the reciprocation of the refill 3, the tip is formed into a triangular cross-section. Or a plurality of cylindrical projections that are in contact with the outer periphery of the refill 3 all around.

The present invention is configured as described above, and has the following effects. (Claim 1) The rattling preventing portion comes into contact with the refill to prevent rattling of the pen tip and align the axis of the refill with the axis of the barrel, so that the pen tip is rattled or caught in the tip opening. Not only does it protrude and disappear, but also because the anti-rattle part is formed integrally and has a relatively small number of parts and a simple structure, the assembly man-hour during manufacturing is greatly reduced, and the anti-rattle part It is possible to provide a high-quality retractable writing instrument which is free from defects such as detachment, has a function of preventing rattling of the refill and a centering function, and is excellent in productivity and high in quality. (Claim 2) Further, by making the rattling prevention portion a plurality of vertical projections extending in the axial direction, the contact between the rattling prevention portion and the refill becomes a line contact with a small contact area, so that the sliding at the time of pen tip protruding and retracting is performed. The dynamic resistance is small, so that the pen tip can smoothly appear and disappear, and a retractable writing instrument with good operability can be provided.

[Brief description of the drawings]

FIG. 1 shows an embodiment of a retractable writing instrument according to the present invention, in which (a) shows a longitudinal sectional view, and (b) shows an enlarged sectional view taken along a roll line.

[Explanation of symbols]

 1: Shaft tube 1a: Prevention of rattling (vertical projection) 2: Tip 2a: Tip 3: Refill 3a: Pen tip 5: Feeding mechanism

Claims (2)

[Claims] 1. A retractable writing implement, wherein a rattling preventing portion for contacting a refill to prevent rattling of a pen tip is integrally formed on an inner surface near a distal end opening. 2. The retractable writing instrument according to claim 1, wherein the backlash preventing portion comprises a plurality of longitudinal projections extending in an axial direction.