JP4282352B2 - Knock part of knock type writing instrument - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a knock portion in a knock type writing instrument.
[0002]
[Prior art]
In order to prevent slipping and reduce fatigue when writing on the gripping part of the shaft tube, a grip member made of rubber or thermoplastic elastomer is placed on the gripping part at the same time as the shaft tube by two-color molding This method is disclosed in Japanese Utility Model Registration No. 2537274 and widely known to those skilled in the art.
[0003]
Further, in a knock type writing instrument having a knock portion that protrudes from the rear end of the shaft tube and projects the writing core from the tip of the shaft tube by pressing it forward, the shaft tube, cap, tip shaft, clip, knock portion, etc. Japanese Utility Model Publication No. 5-24559 discloses a technique for providing a foaming resin layer formed of a mixture of a cross-linkable resin and a foaming agent in order to prevent slipping due to hand sweat, etc. ing.
[Patent Document 1]
Utility Model Registration No. 2537274 [Patent Document 2]
Japanese Utility Model Publication No. 5-24559
[Problems to be solved by the invention]
In order to bring a non-slip effect to the knock part, a structure in which a soft elastic resin layer is provided at the head end part of the knock part by two-color molding, a structure in which a decorative piece is arranged at the head end part of the knock part, for example, a circular shape There have been many proposals of a structure with a decorative part made by changing the color of the above, and there is a problem that it is not satisfactory in appearance. Also, most of the knock parts are made of hard resin or metal, and even if a small decorative part is given to the knock part of such a material, the impression resulting from the material feeling is stronger, giving a strong design to the viewer Is difficult.
[0005]
The present invention is intended to solve the above-described problem, and provides a knocking portion of a knock-type writing instrument with an anti-slip effect due to sweat or the like during knock operation, and has a novel design feeling that is different from the conventional one. It is for the purpose.
[0006]
[Means for Solving the Problems]
The present invention provides a knock part of the knock-type writing instrument that projects from the rear end of the barrel, the knock part so as to form a hard resin member, a portion exposed to protrude outward from at least the barrel of the knock part, hand A belt-like protrusion extending from the outer peripheral surface of the other through the head end surface portion to the opposite outer peripheral surface is formed , and a soft elastic resin member is disposed on the hard resin member by two-color molding in a portion other than the protrusion. The knocking portion of the knock type writing instrument is characterized in that the hard surface portion of the protrusion portion and the soft surface portion of the other portion are configured, and the hard surface portion and the soft surface portion are substantially flush with each other.
[0007]
Te present invention smell, the strip-shaped projections extending in the other of the outer peripheral surface opposed through the head end surface from the one peripheral surface, also be constructed with one protrusion extending continuously in the longitudinal direction good to may be one constructed by arranging the one one place or several places in the strip is moved away a plurality of projections so that the state of being partially cut in a straight line.
[0008]
In the present invention, particularly when the knocking writing instrument is a mechanical pencil, the knocking part needs to be removed from the rear end of the shaft cylinder when using an eraser disposed in the knocking part or when replenishing a lead core. However, it is possible to prevent slipping due to sweat when pulling while pinching the knock part, so if it is adopted for a knock type writing instrument with a knock part detachably provided at the rear end of the shaft cylinder It is even more effective.
[0009]
In the present invention, the hard surface portion of the belt-like protrusion and the soft surface portion of the other portion are substantially flush with the hard surface portion positioned in the soft surface portion when the knock portion is operated. The problem that the edge is caught by the finger and the soft surface is rolled can be prevented.
[0010]
Further, the present invention uses the knock-type writing instrument as a ballpoint pen, a mechanical pencil, or a marker, or the size of the ball diameter of the ballpoint pen by using different widths, numbers, and colors of the band-like projections that are hard surface portions. Or a means for visually discriminating what is the color of the ink accommodated in the shaft cylinder in a ballpoint pen or the like.
[0011]
Examples of the hard resin member in the present invention include polypropylene, polycarbonate, acrylonitrile-butadiene-styrene (ABS resin), and the like. Examples of the soft elastic resin member include thermoplastic elastomers such as polyolefin-based elastomers, polystyrene-based elastomers, polyester-based elastomers, polyvinyl chloride-based elastomers, polyurethane-based elastomers, and heat-adhesive elastomers (heat-bondable elastomers). Considering the adhesiveness to the hard resin member, it is preferable to use a heat-adhesive elastomer (heat-bondable elastomer).
[0012]
By the way, the knock part has a structure in which a cap (crown) is fitted to the rear end of the knock body into which the eraser is inserted in the mechanical pencil or the rear end of the knock body for feeding out the writing tip as described above. In the thing, a cap (head crown) is a knock part.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described with reference to the drawings.
Nock 1 in knock-type writing instrument of the reference example shown in FIGS. 1-4, there is a knock part Roh click ballpoint pen 2, but is not limited thereto. A knock type ballpoint pen 2 shown in FIG. 1 has a well-known structure, and a ballpoint pen feeler 4 is urged in a shaft tube 3 by a coil spring 5 toward the rear end 3a of the shaft tube 3. It has a structure provided with a feeding mechanism that is arranged and includes a push bar 6, a rotating cam 7, and a cam groove (not shown). The knock portion 1 is provided by screwing at the rear end of the push bar 6, but may be provided by press-fitting instead of screwing.
[0014]
The knock portion 1 of the reference example is formed of a hard resin such as ABS resin, is screwed to the push rod 6 and is connected to the rear end of the shaft tube 3, and is outward from the rear end of the shaft tube 3 of the knock portion 1. As shown in FIGS. 2 and 3, two protrusions 10 are provided on the peripheral side surface of the exposed portion so as to be spaced apart from each other so that two opposing ring-shaped portions are cut off. It is. Surfaces other than the protruding portion 10 is formed by two-color molding so as to cover a soft elastic material such as port Riesuteru elastomer. The surface of the protruding portion 10 is provided as a hard surface portion 9, and the other portions other than the protruding portion 10 are provided as a soft surface portion 8. The hard surface portion 9 and the soft surface portion 8 are provided in substantially the same plane. .
[0015]
The knock portion 1 is first molded with a hard resin and secondarily molded with a soft elastic member so that the soft surface portion 8 is disposed at the desired position .
[0016]
5 to 7, the knock portion 21 showing the embodiment of the present invention is located at the rear end of the shaft tube when positioned at the rear end of the shaft tube (not shown), as in the above-described reference example. A soft surface portion 22 made of a soft elastic member such as a polyester elastomer is provided by two-color molding from an arbitrary portion to be immersed to the head end portion 21a. The soft surface portion 22 is provided with a belt-like hard surface portion 23 that is substantially flush with the soft surface portion 22 and extends from one outer peripheral surface to the other outer peripheral surface facing the other through the head end portion 21a. is there.
[0017]
The knock part 21 is primary-molded with a hard resin in the same manner as the knock part 1 of the reference example, and secondary-molded with a soft elastic member so that the soft surface part 8 is disposed at the desired position. . At this time, a protruding portion 24 is formed which extends from one outer peripheral surface to the other outer peripheral surface facing the other through the head end portion 21a and protrudes in a strip shape so as to be the same height as the soft surface portion 22.
[0018]
Although not shown, in the structure where the knock part is mounted on the outer side of the shaft tube by being detachable from the state protruding outward from the shaft tube, by fitting, press-fitting or screwing, For example, when using an eraser attached to the rear end of the barrel, such as a mechanical pen, or when replenishing a lead core, it is necessary to remove the knock part. The friction resistance is higher than that of the elastic resin member, and when the knock portion is grasped, it can be easily moved in the rotational direction and the axial direction, and the attachment / detachment operation is facilitated.
[0019]
【The invention's effect】
Since the present invention is a knock part in the knock type writing instrument having the above-described configuration, it is needless to say that the knock part has a non-slip effect during the knock operation, and the knock part has a good feel and is conventionally made of metal or hard resin. Since the soft surface portion made of the soft elastic resin member is provided in the portion, a strong impression can be given to the viewer.
[0020]
In addition, by changing the width and number of the band-shaped protrusions and the color of the hard resin, the knock type writing instrument is a ballpoint pen, mechanical pencil, or marker, or the ball diameter of the ballpoint in the ballpoint pen. Alternatively, it is possible to provide a visual discrimination means for informing what the color of the ink accommodated in the shaft cylinder is.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view of a knock-type writing instrument having a knock portion showing a reference example of the present invention.
FIG. 2 is an enlarged view of a knock portion in FIG. 1;
3 is a cross-sectional view taken along line AA in FIG.
FIG. 4 is an enlarged side view of a main part of a knock part according to a reference example of the present invention.
FIG. 5 is an enlarged side view of a main part of a knock part, showing an embodiment of the present invention .
6 is a plan view seen from the head of the knock portion in FIG. 5. FIG.
7 is a cross-sectional view taken along line BB in FIG.

Claims (2)

In knock part of the knock-type writing instrument that projects from the rear end of the barrel, the knock part so as to form a hard resin member, a portion exposed to protrude outward from at least the barrel of the knock part, from the outer peripheral surface of the hand A band-shaped protrusion extending to the other outer peripheral surface facing through the head end surface is formed , and a soft elastic resin member is disposed on the hard resin member by two-color molding in a portion other than the protrusion, A knock portion of a knock type writing instrument comprising a hard surface portion and a soft surface portion of another portion , wherein the hard surface portion and the soft surface portion are substantially flush with each other.   The knock part in the knock type writing instrument according to claim 1, wherein the knock part is detachably provided at a rear end of the shaft cylinder.

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