JP2007112032A - Writing instrument with open / close lid - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a writing utensil, with an opening/closing lid, which is free from the coming-off of a spring for closing a lid due to impact etc, shows excellent airtightness during closing the lid and can save cost by simplifying the structure of the utensil. <P>SOLUTION: A torsion coil spring is obtained by molding a coil part, a first arm and a second arm of stainless wire rod with a plated layer formed on the surface and releasing the plated layer after molding. The first arm is secured to a securing bush formed on a lid body, the second arm is brought into contact with the side of a hollow pipe and the coil part is arranged between a pair of rewinding parts formed on the lower end of the lid body. Further, a shaft bar made of stainless steel is fitted into a fitting hole formed on the side of the hollow pipe, and thus can be inserted and fixed into the coil part of the torsion coil spring and the rewinding part of the lid body. When a writing element is accommodated inside a barrel, the barrel is blocked by bringing the lid body into contact tightly with the tilting forward end surface of an elastic tip neck with the help of a resilient force of the torsion coil spring. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a writing instrument with an opening / closing lid having a structure in which a writing body is accommodated inside a shaft tube and the front of the shaft tube is closed by a lid.

  2. Description of the Related Art Conventionally, a writing instrument having a structure in which a lid is provided in front of a shaft cylinder to prevent drying of a writing body accommodated inside the shaft cylinder and to prevent dust from entering. These have a structure in which the cover body is pressed and opened at the tip of the writing body by the knocking operation of the knocking body provided at the rear end portion of the shaft cylinder, and the writing tip is made to protrude by protruding the tip of the writing body from the shaft cylinder. Many have been adopted. Such structures are described in Japanese Utility Model Publication No. 42-83, Japanese Utility Model Publication No. 45-15532, and Japanese Patent Application Laid-Open No. 58-89399.

Actual Kosho 42-83 No.45-15532 JP 58-89399 A

  However, since the writing instrument described in the Japanese Utility Model Publication No. 42-83 is formed integrally with the cover plate and the elastic legs, dimensional management must be strictly performed during manufacture. The reason is that there is no play in the lateral direction and the twist direction in the lid plate and the elastic legs, and the annular body of the elastic material with which the lid plate abuts is a thin ring shape, and the height is low and difficult to bend. This is because a gap is easily generated between the annular body. In addition, the writing instrument described in Japanese Utility Model Publication No. 45-15532 has a structure in which an elastic member is not provided at a portion where the lid is closed, which is disadvantageous in terms of sealing the lid. Further, in order to prevent the opening / closing lid at the tip of the shaft cylinder from falling off, it is necessary to attach a plate-like member to the front end of the shaft cylinder after attaching the opening / closing lid and the spring. Further, the writing instrument described in Japanese Patent Application Laid-Open No. 58-89399 requires a lid receiving cover for locking the lid plate to be fixed to the front of the pipe-shaped holder, and is commonly used as a fixing method. Work such as bonding or bonding tends to increase costs. In addition, the coil spring that is used to eject and close the lid plate prevents the outer side surface of the lid plate and the inner side surface of the lid receiving cover from being displaced by the spring of the coil spring itself. In such a case, there was a concern that the coil spring would jump out vigorously due to its elastic force.

  In view of these facts, the present invention prevents the spring for closing the lid from coming off due to an impact or the like, has excellent sealing performance when the lid is closed, and reduces the cost by simplifying the structure. The purpose is to propose a writing instrument with an openable / closable lid.

The above-described problems of the present invention are solved by the following means. That is, the present invention
`` By the forward movement of the cursive body accommodated in the shaft cylinder, the lid arranged in front of the axial cylinder is pressed against the tip of the cursive body and opened, and the cursive body moves backward to be accommodated inside the axial cylinder. In a writing instrument with an opening / closing lid structured to close the shaft cylinder by closing the lid body by the spring force of the spring attached to the lid body, a hollow pipe is arranged at the front portion of the shaft cylinder, An elastic front neck having an inclined front end surface and an opening continuous with the through-hole of the hollow pipe is disposed in the portion, and a lid that is in close contact with the inclined front end surface of the elastic front neck is disposed in front of the elastic front neck. A latch receiving portion provided on the lid with a torsion coil spring formed by forming the coil portion, the first arm and the second arm with a stainless steel wire having a plating layer on the surface and peeling the plating layer after molding. The first arm is engaged with the second arm, the second arm is brought into contact with the side surface of the hollow pipe, and a pair of lower ends of the lid body are formed. A coil portion is arranged between the return portions, and a shaft rod made of stainless steel is inserted into a mounting hole formed on the side surface of the hollow pipe, whereby the shaft rod is twisted and inserted into the coil portion of the coil spring and the winding portion of the lid. With an open / close lid characterized by a structure that closes the shaft cylinder by bringing the lid into close contact with the inclined front end surface of the elastic front neck by the elastic force of the torsion coil spring when the writing body is housed inside the shaft cylinder The writing instrument.

  According to the writing instrument with an opening / closing lid of the present invention, the opening / closing lid can be provided on the writing instrument with a simple structure. In addition, since a permanent fixing structure such as adhesion or welding is not required when assembling the opening / closing lid structure, it is easy to disassemble and reassemble even if a defect is found during inspection after assembly. Yes, it is easy to replace defective parts. The torsion coil spring for closing the lid has a structure in which the first arm is engaged with the engagement receiving portion provided on the lid body, and the shaft rod attached to the hollow pipe is inserted into the coil portion. Will not come off. In addition, since the opening / closing lid structure of the present invention is composed of a unit mainly composed of a hollow pipe, the unit can be used as a plurality of items, and the manufacturing cost including other products can be reduced. It is possible to work synergistically.

  In addition, since the torsion coil spring of the present invention uses a stainless steel wire having a plating layer on the surface, it is easy to mold due to the presence of the plating layer, and the presence of an electrolyte solution such as ink by peeling the plating layer after molding. Even below, there is no problem of galvanic corrosion (foreign metal contact corrosion) between the shaft rod made of stainless steel and the plating layer of dissimilar metal, and the coil portion with respect to the shaft rod performed at the time of opening and closing the lid body There is no worry of obstructing sliding. The plating layer provided on the stainless steel wire forming the torsion coil spring includes Ni-based, Cu-based, Sn-based, etc., but the friction property of the plating layer at the time of molding and workability when peeling the plating layer with nitric acid etc. In view of the influence on the stainless steel wire, the plating layer is preferably made of Ni.

  Moreover, what is necessary is just to make the latching | locking part provided in the 1st arm of a torsion coil spring into the shape which can be latched by the latching receiving part formed in the said cover body. For example, a latch receiving portion that is folded back in the shape of a tongue piece is provided at the tip of the lid, and the first arm is formed by bending a latch portion that is hooked on the tongue piece, and the latch portion of the first arm is formed on the lid body. It is good also as a structure which hooks and latches on a latching receiving part, or provides a latching receiving hole in a cover body and inserts the front-end | tip of a 1st arm in the said latching receiving hole, and latches. In addition, it is important to set the latch receiving portion of the lid and the first arm of the torsion coil spring to have a shape and a positional relationship that do not hinder the forward movement of the writing tip. The second arm of the torsion coil spring may have a length such that a part of the second arm abuts against the outer surface of the hollow pipe when the coil portion of the torsion coil spring is fixed with the shaft rod.

  The hollow pipe is preferably a metal pipe that is excellent in strength even if it is thin, considering that it is disposed inside a narrow shaft cylinder. The lid is preferably formed by bending a thin metal plate in view of being repeatedly pressed by the writing tip of the writing body or being placed in a small space. In addition, it is preferable to use the stainless steel material excellent in ink resistance for the metal material used for the opening-and-closing lid structure of this invention in consideration of the influence by ink. For the elastic head, considering the influence of ink used as a writing instrument, if an elastic material with excellent ink resistance such as NBR (acrylonitrile butadiene), fluorine rubber or EPDM (ethylene propylene rubber) is appropriately selected Good.

  In order to facilitate understanding of the present invention, description will be made with reference to the drawings. The writing instrument of the present embodiment is a fountain pen with an open / close lid provided with a pen tip at the tip of a cursive body. In this embodiment, the side with the pen tip is expressed as the front side, and the opposite side is expressed as the back side. FIG. 1 is a longitudinal sectional view of a fountain pen according to this embodiment. The fountain pen 1 has a hollow pipe 5 disposed in a front portion 4a of a shaft body 4 formed by screwing a front shaft 2 and a rear shaft 3 together. Further, an elastic front neck 6 is attached to the front portion of the hollow pipe 5, and the inclined front end face 6 a of the elastic front neck 6 is closed with a lid 8 by the elastic force of the torsion coil spring 7. The opening 6b of the elastic front neck 6 and the through-hole 5a of the hollow pipe 5 are connected to each other. By pressing the knock body 10 protruding from the rear end opening 4b of the shaft cylinder body 4, a writing body 9 is obtained. The pen nib 9a presses and opens the lid 8, and the pen nib 9a protrudes from the opening 11a of the base 11 fixed to the front part 4a of the shaft tube body 4 so that writing can be performed. The writing body 9 is always pushed backward by the elastic force of the spring 12.

  2 is a view of a hollow pipe, FIG. 2A is a side view, FIG. 2B is a top view, and FIG. 2C is an end view taken along line AA of FIG. 3 is a view of the elastic front neck, FIG. 3A is a view from the front, FIG. 3B is a view from the side, and FIG. 3C is a view from above. As shown in FIG. 2, the hollow pipe 5 is a cylinder having a through hole 5a in which a rectangular engagement hole 5b is drilled on the front upper surface, round mounting holes 5c are drilled on both side surfaces, and a notch 5d is formed on the lower surface. Shape. Further, as shown in FIG. 3, the elastic front neck 6 has an inclined front end face 6a inclined from the upper side to the lower side in FIG. 3B and an opening 6b penetrating in the front-rear direction in the front part. Is provided with a press-fit portion 6c that is press-fitted into the front end of the hollow pipe 5, and an engaging projection 6d that is engaged with the engagement hole 5c is provided on the upper surface in front of the press-fit portion 6c. Further, a step portion 6e is formed under the inclined front end face 6a, and an L-shaped protrusion portion 6f protruding in an L shape along the side surface is provided on the step portion 6e. The front surface of the L-shaped protrusion 6f is provided with a protrusion 6g that protrudes small forward.

  Next, the structure of the main part in the present embodiment will be described in detail. FIG. 4 is a cross-sectional view of the main part of the present embodiment. FIG. 5 is a view of FIG. 4 as viewed from the front. 6 is an enlarged cross-sectional view taken along line BB in FIG. The elastic front neck 6 has a press-fit portion 6 c press-fitted into the hollow pipe 5. Further, the L-shaped protrusion 6 f of the step 6 e of the elastic front neck 6 is placed with a coil portion 7 a of the torsion coil spring 7 and a pair of winding portions 8 a formed in parallel to the lower end of the lid 8. It is arranged in. In addition, the shaft rod 13 which inserts and fixes the coil part 7a and the winding-back part 8a to the attachment hole 5c provided in the both sides | surfaces of the hollow pipe 5 is attached. Further, a first arm 7b is extended forward of the coil portion 7a of the torsion coil spring 7. The first arm 7b has a locking portion 7c bent so as to be parallel to the shaft 13 and is locked in a gap 8c of a locking receiving portion 8b formed by bending the front end of the lid body 8. . The locking portion 7 c is bent at the tip to form a retaining portion 7 d so that it cannot be removed from the locking receiving portion 8 b of the lid 8. The second arm 7e extending rearward of the coil portion 7a is fixed in contact with the outer surface of the hollow pipe 5 by the spring force of the spring.

  FIG. 7 is a view of a torsion coil spring. FIG. 7A is a front view and FIG. 7B is a side view. The torsion coil spring of the present embodiment is a stainless steel wire having a nickel plating layer on the surface, and after the coil portion 7a, the first arm 7b, the second arm e, the locking portion 7c, and the retaining portion 7d are formed. It is made by immersing in nitric acid and peeling the plating layer. 8 is a view of the lid, FIG. 8A is a view from the front, and FIG. 8B is a view from the side.

  In the present embodiment, a groove 13a is formed on the outer periphery of the shaft bar 13, and when the shaft bar 13 is inserted into the mounting hole 5c, the protrusion 6g formed on the elastic front neck 6 is formed on the shaft bar 13. The projection 6g is restored when the shaft rod 13 is in the position of the groove 13a of the shaft bar 13 to prevent the shaft rod 13 from coming off. Note that, as described above, the relationship between the hollow pipe 5 and the elastic front neck 6 according to the present embodiment is that the engagement protrusion 6d of the elastic front neck 6 is engaged with the engagement hole 5c of the hollow pipe 5. In addition, since the elastic front neck 6 is prevented from being removed by the shaft 13 attached to the hollow pipe 5, the pressure input of the elastic front neck 6 to the hollow pipe 5 can be set low. The amount of deformation is small, and it has a structure that does not adversely affect the tightness between the elastic front neck 6 and the lid 8.

  Next, the structure when the lid is opened will be described in detail with reference to FIG. FIG. 9 is a view showing a state where the pen tip is protruded by operating the knock body. By pressing the knock body 10 (see FIG. 1) at the rear of the barrel body 4 forward, the nib 9a of the writing body 9 moves forward and comes into contact with the back surface of the lid body 8, and the lid body 8 is pivoted. With the rod 13 as the axis, it pivots forward to open, and the pen nib 9a protrudes from the opening 11a of the base 11 so that writing is possible. In the state where the pen tip 9a protrudes from the opening 11a, the lid body 8 does not close because it contacts the lower surface of the pen tip 9a. When the knocking body 10 is knocked again, the nib 9 a is retracted into the opening 11 a of the base 11 and is immersed in the opening 6 a of the elastic front neck 6, and the lid 8 is elastically pointed by the elastic force of the torsion coil spring 7. The shaft tube is closed close to the inclined front end face 6a of the neck 6.

  The writing instrument with an openable / closable lid of the present invention can be used not only for fountain pens but also for applicators such as markers, ballpoint pens, correction fluids, and cosmetics.

It is a longitudinal cross-sectional view of the fountain pen of the embodiment. FIG. 2A is a side view of the hollow pipe, FIG. 2B is a side view, and FIG. 2C is an end view taken along line AA of FIG. 2A. FIG. 3A is a front view, FIG. 3B is a side view, and FIG. 3C is a view from above. It is principal part sectional drawing of this example of an embodiment. It is the figure which looked at FIG. 4 from the front. FIG. 5 is an enlarged sectional view taken along line BB in FIG. FIG. 7A is a view of a torsion coil spring, FIG. 7A is a view from the front, and FIG. 7B is a view from the side. FIG. 8A is a view of the lid, and FIG. 8B is a view as seen from the side. It is a figure of the state which operated the knock body and made the pen tip protrude.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Fountain pen, 2 ... Front shaft, 3 ... Rear shaft, 4 ... Shaft cylinder main body, 4a ... Front part, 4b ... Rear end opening part,
5 ... hollow pipe, 5a ... through hole, 5b ... engagement hole, 5c ... mounting hole, 5d ... notch,
6 ... Elastic neck, 6a ... Inclined front end face, 6b ... Opening, 6c ... Press-fit part,
6d ... engaging protrusion, 6e ... step, 6f ... L-shaped protrusion, 6g ... protrusion,
7 ... Torsion coil spring, 7a ... Coil part, 7b ... First arm, 7c ... Locking part,
7d: retaining portion, 7e: second arm,
8 ... Lid, 8a ... Rewinding part, 8b ... Lock receiving part, 8c ... Gap,
9 ... cursive, 9a ... nib,
10 ... knock body, 11 ... base, 11a ... opening, 12 ... spring,
13 ... shaft bar, 13a ... groove.

Claims (1)

By the forward movement of the writing body accommodated in the shaft cylinder, the lid disposed in front of the axial cylinder is pressed against the tip of the writing body to open, and the writing body is moved backward to be accommodated in the shaft cylinder. In a writing instrument with an opening / closing lid structured to close the shaft cylinder by closing the cover body with the elastic force of a spring sometimes attached to the lid body, a hollow pipe is arranged at the front portion of the shaft tube, and the front portion of the hollow pipe An elastic front neck having an inclined front end surface and an opening continuous with the through-hole of the hollow pipe, and a lid closely contacting the inclined front end surface of the elastic front neck is disposed in front of the elastic front neck, A torsion coil spring formed by forming a coil portion, a first arm, and a second arm with a stainless steel wire having a plating layer on the surface and peeling the plating layer after forming is formed on a latch receiving portion provided on the lid. A pair of windings formed at the lower end of the lid, with the first arm locked, the second arm abutting against the side of the hollow pipe The coil part is arranged between the parts, and the shaft bar made of stainless steel is inserted into the mounting hole formed on the side surface of the hollow pipe, so that the shaft bar is twisted and inserted through the coil part of the coil spring and the winding part of the lid. With an open / close lid characterized by a structure that closes the shaft cylinder by closing the lid body by the elastic force of the torsion coil spring when the writing body is housed inside the shaft cylinder Writing instrument.

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