JPH09226290A - Writing element popping-up device for knocking-type writing instrument - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve a pressing member applicable to not only a short-size writing element but also to a conventionally used long-size writing element in a knocking-type writing instrument equipped with a writing element popping-type device which is composed of a smallest number of parts and is actuated by a means for engaging the pressing member formed in one piece with a clip member with a shaft cylinder. SOLUTION: A writing element 3 is stored in a shaft cylinder 1 in freely replaceable manner by forming the shaft cylinder 1 monolithically with a tip shaft 1e and a rear shaft 1f using a means such as screwing. At the same time, a hollow cylindrical part 2b is formed at a tip part 2d, and the tail end part 3b of the writing element 3 energized to a rear end opening part 1b size by engagement with the shaft cylinder 1 is stored into the cylindrical part 2b by a pressing member 2 consisting of an elastic piece 2c connected to a clip member 2g through an upright part 2f formed with the outer peripheral face of the cylindrical part 2b as a base part 2e. Further, the upright part 2f to which the clip member 2g is connected is engaged with the interior of a guide groove 1c in such a manner that the upright part 2f is transferable in the axial direction, and part of a pressing part 2e is mounted in such a way that it is extruded outward from the rear end opening part 1b.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a knock-type writing instrument, and particularly to a structure in which the number of parts is greatly reduced and the writing portion of the writing body is projected into the pocket of a clothing or the like while protruding from the tip of the barrel. The present invention relates to a writing body retracting device provided with a safety device in which a writing section is retracted into a barrel during mounting so that the cloth is not contaminated by mounting.

[0002]

2. Description of the Related Art As a prior art relating to a structure in which the number of parts in a knock-type writing instrument is greatly reduced, there is, for example, Japanese Utility Model Publication No. 39-21927. The constituent parts of the invention are a hollow shaft cylinder which is opened at the front end and the rear end, an elastic member, and a writing body which is biased by the elastic member toward the rear end opening portion and accommodated in the shaft cylinder. , A pressing member that is installed from the opening of the rear end of the shaft cylinder and is provided with a retracting device for the writing body associated with the rear part of the shaft cylinder, and that pushes and retracts the writing part of the writing body from the opening of the front end of the shaft cylinder. In addition to the effect that the assembly is simple, the advantage of using a writing body having a length substantially the same as that of the barrel body by disposing the writing member at the center of the pressing member is disclosed. .

Next, when the writing part of the writing body is installed in a pocket of clothing or the like while satisfying the requirements of the device of Japanese Utility Model Publication No. 39-21927 and the writing part of the writing body projects from the tip opening of the shaft cylinder, the writing part is rotated. As a prior art provided with a safety device that can be immersed in a cylinder, there is, for example, Japanese Utility Model Publication No. 5-25915 shown in FIG. The invention is composed of a shaft cylinder 1 , an elastic member 4, a writing body 3 and a pressing member 2 in which a clip is integrated. The shaft cylinder 1 has a standing portion 2f for connecting a clip member 2g of the pressing member to the rear end side thereof. a guide groove 1c to move axially back and forth, Yes and locking hole 1d is provided collinear to the tip opening 1a position close, the pushing member 2 cursive 3 provided a hollow cylindrical portion 2b
In addition to accommodating the tail end portion 3b, a standing portion 2f protruding outward and connected to the clip member 2g is provided on the outer periphery.
The tip of the clip member is provided with a downwardly projecting portion 2h that engages with the locking hole of the shaft cylinder, and the pressing portion 2e is formed so as to project outward from the shaft cylinder rear end opening 1b. ing. With the above-described structure, even if the writing portion 3a of the writing body 3 is attached to a pocket of clothing with the writing portion 3a protruding from the tip end opening 1a of the barrel, the tip projection 2h of the clip member 2g is engaged with the barrel fitting. Since it is submerged in the stop hole 1d, it cannot be attached to the pocket unless the engagement is released.

However, the fairness 5 equipped with a safety device
The device of No. 25915 had a big problem. The problem is that in this writing and retracting device, the clip member integrated with the pressing member swings with its upright portion as a fulcrum, the tip projection always contacts the surface of the barrel, and Since it must be configured to exert an elastic force directed in the radial direction of the cylinder, in this state, the writing part of the cursive body is projected from the tip end opening of the barrel and engages with the barrel locking hole. Depending on the usage such as repeating the retracting operation of the cursive body that separates the tip projection of the clip member, pinching thick cloth, and in some cases expanding the clip member outwards unexpectedly, It was unexpectedly frequent that fatigue fracture occurred at the joint with the upright portion, which was the fulcrum of rocking.

As a means for solving this problem, the official gazette of Japanese Utility Model Publication No. 6-15741 shown in FIG. 6 is disclosed. According to the invention, an upright portion that connects the clip member 2g integrally formed with the pressing member 2 to the clip member by using the tip 2a for pressing the writing body 3 as a base 2d without swinging at the upright portion 2f is provided. The elastic member 2c, which includes itself and elastically outwardly, is formed, the clip member is exposed to the outside of the barrel 1 and the upright portion is positioned in the guide groove 1c of the barrel, and the pressing portion 2e is located at the rear end of the barrel. It is projected outward from the opening 1b. As a result, the elastic piece 2c in which the clip member 2g is continuously provided via the upright portion 2f always springs the rear portion of the clip member to the outside of the shaft cylinder, and an excessive load is applied to the connecting portion between the clip member and the upright portion. It means that the tip projection 2h of the clip member is always pressed in the radial direction of the barrel without being applied. The invention also discloses that if a spring S is attached between the elastic piece 2c and the pressing portion 2e, the effect is doubled.

[0006] As described above, the improvement of the writing body retracting device of the knock type writing instrument with the minimum number of constituent parts and the safety device to prevent the clothes from becoming dirty is as follows.
It is apparent from the above-mentioned prior art examples.

[0007]

However, in the curving body retracting device shown in Japanese Utility Model Publication No. 6-15741, the pressing member formed integrally with the clip member via the upright portion of the clip member is attached to the barrel. The standing portion of the clip member is movably engaged with the drilled guide groove to maintain the operation in the barrel and the stable accommodation state.However, once the standing portion is mounted in the guide groove, The pressing member is often used for so-called disposable writing instruments that cannot be easily removed from the barrel, and in addition, the writing body (refill) tends to be shortened, and the pressing member used with the long refill that has been used in the past. On the contrary, problems such as incompatibility have become a concern. Jikkō Sho 39-21927 and Jikkou 5-25 mentioned above
In No. 915, there is an advantage that a writing body having a long total length is used because a part of the writing body enters the pressing member. Certainly it was necessary to improve the durability of the retractable mechanism,
For this reason, the tendency for cursive writing to become shorter is not only to increase the number of cursives used from the cursives used in the past to new cursives, but also to improve compatibility with cursives used in the past. It is abandoned, and the self-righteous idea of the person who makes the product results in the user being forced to inconvenience himself.

[0008]

Means for Solving the Problems and Embodiments The present invention has been made in view of the above situation, in which the front end and the rear end are opened, and the rear end face extends in the axial direction from the rear end face toward the front end. The guide groove is further accommodated on the same line by arranging a locking hole or a locking projection at a position closer to the front end opening, and a biasing member in the shaft cylinder toward the rear end opening by an elastic member. Cursive script,
At the writing position where the writing portion of the writing body is projected from the tip end opening portion of the barrel, a clip member having a tip protrusion that engages and disengages with the barrel locking hole or the locking protrusion is provided in the barrel guide groove. The tip end portion in contact with the tail end portion of the cursive body is connected to an elastic piece provided as a base portion through the standing portion located at, and further connected to the tip end portion in contact with the tail end portion of the cursive body, the rear end side In a knock-type writing instrument, the shaft cylinder is composed of a front shaft and a rear shaft, and a pressing part is formed integrally with a pressing part protruding outward from the rear end opening of the shaft cylinder. There is a problem in that a hollow cylindrical portion is formed at the tip of the member to accommodate the tail end of the cursive body, and an elastic piece connected to the clip member through the upright portion forms the outer peripheral surface of the cylindrical portion as the base. It is a means for solution.

The length of a long writing material that has been used in the past is about 110 mm, and many knock-type writing tools using this writing material use metal parts for the barrel and clip of the exterior material, which is quite expensive. It was a good product. Therefore, there is a time when it is conceivable that the number of parts may be reduced and the disposable writing instrument may be put together at a low cost, so that a writing body having a short length of 20 mm or more is used. Since the present invention overcomes this difference in length of 20 mm or more and uses a writing body with a total length of 110 mm which has been conventionally used, a hollow cylindrical portion is formed at the tip of the pressing member where the pressing member and the writing body overlap. However, the tail end portion of the cursive body is housed in the cylindrical portion, and an elastic piece is provided with the outer peripheral surface of the cylindrical portion as the base portion, and the specification change of this pressing member is almost the same as the exterior of the conventional product. It was confirmed that this was possible within the range of the outer diameter. Note that the cursive body is exchanged by configuring the barrel with a front shaft and a rear shaft. As a result, the axial cylinder is divided into two parts, and only a part of the specification change from the tip of the pressing member to the elastic piece does not impair the function and performance of the writing device retracting device and the safety device, and is inexpensive and conventional. The present invention has provided a knock-type writing instrument having compatibility with existing writing systems.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. Note that the same reference numerals as those used to describe the above-described prior art example to indicate the members and the parts of the members will be described using the same reference numerals.

FIG. 1 is a longitudinal sectional view of a knock type writing instrument according to an embodiment of the present invention, in which a writing body is housed in a barrel, and FIG.

In the barrel 1, the front shaft 1e and the rear shaft 1f are integrally formed in a removable state by, for example, screw fitting, and are opened at both ends, and the shaft center is directed from the rear end opening 1b to the front end opening 1a. A guide groove 1c is further provided along the direction, and a locking hole 1d is provided on the same line at a position near the tip opening portion to form a hollow shape (see FIG. 3). In addition, the locking hole 1d is used for the pressing member 2 described later.
Since it is used as an engaging means with the clip member tip projection 2h, it is natural that this may be formed as a locking projection, and a description thereof will be omitted below.

The pressing member 2 further includes a hollow cylindrical portion 2b for accommodating the tail end portion 3b of the writing body 3 at the tip portion 2a, and further connected to the rear end of the cylindrical portion to form a pressing portion 2e. The outer peripheral surface of the portion is provided as a base portion 2d, and the elastic piece 2c is provided so as to extend slightly outward in the direction of the pressing portion, and the clip member 2g is provided at the rear end of the elastic piece via the erecting portion 2f directed outward. And a protrusion 2h is provided inside the tip of the clip member (see FIG. 4).

[0014] A cursive 3 is biased in the rear end opening 1b side by the elastic member 4 in the axial barrel 1 is housed the writing portion 3a at a position before the distal end opening portion 1a, the pressing member 2 The cylindrical end 2b accommodates the tail end portion 3b of the cursive body, and the rear end surface of the standing portion 2f continuous with the elastic piece 2c is engaged with the end surface 1g of the guide groove 1c, and is raised outside the barrel. The clip member 2g connected to the above portion makes the tip projection 2h contact the outer peripheral surface of the shaft cylinder, and a portion of the pressing portion 2e connected to the cylindrical portion 2b is projected outward from the rear end opening 1b. The cursive body is in the immersed state (Fig. 1).

From this state, when the pressing portion 2e of the pressing member 2 projecting from the rear end opening 1b of the shaft cylinder 1 is pressed in the direction of the front end opening 1a of the shaft cylinder, the standing portion 2f located in the guide groove 1c is formed. Guided, tip projection 2h of clip member 2g
Fits into the locking hole 1d of the barrel, and the writing portion 3a of the writing body 3
Is projected from the front end opening of the barrel, and the writing state (FIG. 2) appears.

At this time, it is needless to say that the upright portion 2f connected to the clip member 2g is outwardly elastically repulsed by the elastic piece 2c provided in an outward angled shape, but is durable. In order to improve the property, the spring S may be interposed between the upright portion 2f and the pressing portion 2e.

To return the writing state to the storage state shown in FIG. 1, the rear end of the clip member 2g is pressed toward the center of the shaft cylinder, and the locking hole 1d of the shaft cylinder 1 and the tip projection 2h of the clip member are pushed. engagement relationship is released, the pressing member 2 is rear end opening 1
After moving in the b direction, the rear end surface of the pressing member upright portion 2f engages with the end surface 1g of the guide groove 1c, so that the writing body 3 can be stored.

When it is desired to replace the writing body 3 accommodated in the barrel 1 , remove the leading shaft from the portion where the leading shaft 1e and the rear shaft 1f of the barrel are screwed and replace it with a new writing body. You can

With the above structure, the present invention enables the writing body 3 having a long total length, which has been conventionally used, to be used. However, the length of the cylindrical portion 2b provided at the tip portion 2a of the pressing member 2 is reduced. Needless to say, a cursive body that has been shortened can be used in the same manner in consideration.

[0020]

Industrial Applicability The present invention has a safety device which has the minimum component construction which is considered to be impossible to be further simplified in a knock-type writing instrument, and which is free from the danger of soiling clothes due to the protrusion of the writing section. Furthermore, in addition to the economical efficiency of cursive body replacement, it is an improved invention of a cursive body retracting device that enables compatibility with a conventional cursive body having a long overall length.
The specifications can be changed at any time because the cursive body that has been shortened earlier can be used in the same way by considering the length of the cylindrical part of the pressing member without impairing the function and performance of the cursive body retractor and safety device. It has the advantage that it can be easily adopted, and is greatly welcomed by both manufacturers and users.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing an embodiment of the present invention with a cursive body stored therein.

FIG. 2 is a vertical cross-sectional view showing a writing body according to an embodiment of the present invention in a written state.

FIG. 3 is a front view showing a shaft cylinder in a partially cutaway longitudinal section.

FIG. 4 is an enlarged front view showing a pressing member in a partially cutaway vertical section.

FIG. 5 is a vertical cross-sectional view illustrating a prior art of a knock-type writing instrument equipped with a safety device.

FIG. 6 is a longitudinal sectional view illustrating a prior art in which the present invention is intended to be improved.

[Explanation of reference signs] 1- axis cylinder 1a Tip opening 1b Rear end opening 1c Guide groove 1d Locking hole 1e Front shaft 1f Rear shaft 1g End face 2 pressing member 2a Tip part 2b Cylindrical part 2c Elastic piece 2d Base part 2e Pressing part 2f Standing part 2g Clip member 2h Tip projection part 3 Writing body 3a Writing part 3b Tail end part 4 Elastic member

Claims (1)

[Claims] 1. A guide groove is formed at the front end and the rear end, extends from the rear end face toward the front end in the axial direction, and further has a locking hole or a locking projection on the same line at a position close to the front end opening. A shaft cylinder provided, a writing body that is housed in the shaft cylinder by being biased toward the rear end opening side by an elastic member, and a writing position where the writing part of the writing body is projected from the front end opening of the shaft cylinder. A clip member having a tip projection that engages and disengages with the shaft cylinder locking hole or the locking projection is a tip that contacts the tail end of the cursive body through an upright portion located in the shaft cylinder guide groove. The elastic member is provided as a base portion and is further connected to an elastic piece. in knock-type writing instrument configured with a pressing member formed in one piece, the shaft tube (1) after the front barrel (1e) Become from the (1f), the pressing member (2) is hollow cylindrical portion at its distal end (2a) (2b)
Is formed to accommodate the tail end portion (3b) of the cursive body ( 3 ), and the elastic piece (2c) connected to the clip member (2g) via the upright portion (2f) forms an outer peripheral surface of the cylindrical portion (2b). A writing body retracting device for a knock-type writing instrument, wherein the writing body retracting device is formed as a base portion (2d).