JP2009061697A - Multi-refill writing utensil - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a multi-refill writing utensil that is designed to eliminate interference sound between spiral springs which sound tends to occur by making a barrel thinner. <P>SOLUTION: In the multi-refill writing utensil 1, a first spring seat 21a is situated in front from a second spring seat 22a, and therefore, as shown in Fig.6, when a push-button 6 is in a stationary state, namely, when the spiral spring 15 is in an extended state, the end 15a of the spiral spring 15 primarily comes in contact with the first spring seat 21a. Meantime, as shown in Fig.7, when the push-button 6 is pressed down against the spring force, the spiral spring 15 is primarily kept pressurized by the first spring seat 21a, so that the spiral spring 15 can be forced to bend in a manner bulging out to the outside, i.e., to the inner periphery 4e side of the barrel 4. As a result, even with the thinner barrel 4, the interference sound is hardly generated which is caused by rubbing between the spiral springs 15. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a multi-core writing instrument including a plurality of knock members that are slidable in the direction of the central axis of a shaft cylinder.

  Conventionally, there is JP-A-2005-111186 as a technology in such a field. The multi-core writing instrument described in this publication can project the tip of the desired refill from the tip of the shaft tube by pushing down an arbitrary knock member (presser), and by lightly pushing down the other knock member The tip of the refill can be quickly stored in the shaft cylinder by the spring force. Further, the helical spring that enables the refill to be restored is arranged so as to be wound around the refill, and one end of the helical spring is locked to the shaft cylinder, and the other end of the helical spring is the spring of the knock member. It is locked so as to contact the seat surface.

Japanese Patent Application Laid-Open No. 2005-1111876

  However, since the spring seating surface of the knock member provided in the conventional multi-core writing instrument described above is provided only on the inner peripheral surface side of the shaft cylinder, the spiral spring is centered on the shaft cylinder when the knock member is pushed down. It becomes easy to curve so as to swell toward the axis. As the shaft tube is made thinner, the springs in the shaft tube approach each other, which causes a problem that the springs rub against each other when the knock member is pressed down, and interference noise is easily generated.

  An object of this invention is to provide the multi-core writing instrument which made it difficult to generate the interference sound of the spiral springs which become easy to occur by making a shaft cylinder thin.

A multi-core writing instrument according to the present invention, a plurality of refills that selectively appears and disappears from the tip of the barrel,
A plurality of knock members whose front ends are connected to the rear ends of the respective refills and are slidable in the direction of the central axis of the shaft cylinder;
In a multi-core writing instrument that is arranged so as to be wound around the refill, one end is locked to the shaft cylinder, the other end is locked to the knock member, and a helical spring that returns the knock member.
The knock member is provided with a spring seat for locking the spiral spring,
The spring seat portion is located on the central axis side of the shaft tube, and is located on the inner peripheral surface side of the shaft tube and the first spring seat portion having the first spring seat surface with which the other end of the spiral spring abuts. And a second spring seat portion having a second spring seat surface against which the other end of the spiral spring abuts,
The first spring seat surface is located in front of the second spring seat surface.

  In the knock member of the multi-core writing instrument, the first spring seat surface provided in the first spring seat portion is positioned in front of the second spring seat surface provided in the second spring seat portion. Therefore, when the knock member is pushed down against the spring force, the spiral spring continues to be pressed by the first spring seat surface, so that the spiral spring can be flexed so as to swell outward. Therefore, even when the shaft tube is made thin, interference sound caused by rubbing the spiral springs does not occur. Certainly, in the case of a multi-core writing instrument, it is possible to eliminate friction between the spiral springs when the knock member is pushed down by increasing the diameter of the shaft tube or by reducing the diameter of the spring by reducing the refill. When the refill is thinned, the amount of ink in the refill is forced to be reduced. Thus, according to the present invention, it is possible to make the shaft cylinder thin while maintaining the thickness of the refill, and the operational feeling of the knock member is improved by eliminating the friction between the spiral springs.

The first spring seat portion includes first and second peak portions projecting toward the central axis of the shaft cylinder behind the spring loading portion provided in the knock member. It is preferable that the peak portions are juxtaposed.
Thus, since the 1st peak part and the 2nd peak part are juxtaposed, the 1st spring seat surface contacts the end part of a spiral spring stably. Further, the gap between the first peak portion and the second peak portion functions as a relief groove for inserting another knock member loaded in the shaft cylinder when the multi-core writing instrument is assembled. Have.

Further, it is preferable that the spiral spring is formed with end winding portions only at both ends.
The spiral spring having the intermediate winding portion is difficult to be forcibly bent outward by the first spring seat portion of the knock member, and the spiral springs may be rubbed together. A spring is preferred.

  According to the present invention, it is possible to make it difficult to generate an interference sound between spiral springs that are likely to occur when the shaft cylinder is thinned.

  Hereinafter, preferred embodiments of a multi-core writing instrument according to the present invention will be described in detail with reference to the drawings. In the following description, the pen tip side is referred to as “front side”.

  As shown in FIG. 1, the multi-core writing instrument 1 is a four-color knock-type writing instrument. The knock type multi-core writing instrument 1 includes four ball-point pen-type refills 2, a resin shaft cylinder 4 that accommodates each refill 2, and three knock members that are slidable in the direction of the central axis L of the shaft cylinder 4. 6, an open / close clip 8 attached to a knock member 7 slidable in the direction of the central axis L of the shaft cylinder 4, and a non-slip grip 9 fixed to the shaft cylinder 4.

  Further, the shaft cylinder 4 includes a front shaft 4a and a rear shaft 4b, and by screwing a male screw portion provided on the rear side of the front shaft 4a and a female screw portion provided on the front side of the rear shaft 4b, The front shaft 4a and the rear shaft 4b are connected. Thus, by dividing the shaft cylinder 4 into the front shaft 4a and the rear shaft 4b, the front shaft 4a can be removed and the refill 2 can be easily replaced, and the materials of the front shaft 4a and the rear shaft 4b can be changed. It can be different.

  Further, four guide grooves 10 are formed in the rear portion of the shaft cylinder 4, and the resin knock members 6 slide along the three guide grooves 10 a of the four guide grooves 10. A bowl-shaped refill loading portion 6 e formed at the front end of the member 6 is press-fitted into the opening at the rear end of the refill 2. A clip 8 is connected to a resin knock member 7 that slides along another guide groove 10 b via a U-shaped leaf spring 12, and a hook-like shape formed at the tip of the knock member 7. The refill loading unit 7 e is press-fitted into the opening at the rear end of the refill 2.

  Further, four spiral springs 15 for returning the knock members 6 and 7 are accommodated in the shaft cylinder 4, and the refill 2 is inserted into the spiral spring 15. In order to generate a restoring force on the knock members 6, 7, one end of the spiral spring 15 is locked by the shaft cylinder 4, and the other end of the spiral spring 15 is locked at the tip of the knock members 6, 7. .

  In the multi-core writing instrument 1 having such a configuration, the distal end of an arbitrary refill 2 can be projected from the distal end opening 4d of the shaft tube 4 by pushing down either the knock member 6 or the clip 8 with a finger. Each refill 2 that is selectively protruded from the shaft cylinder 4 can store the tip of the refill 2 in the shaft cylinder 4 by lightly pressing the other knock member 6 or the clip 8 with a finger.

  As shown in FIGS. 2 and 3, a finger hook 6a is formed on the outer side of the knock member 6 having a flat and elongated shape, and on the inner side (center axis L side) of the knock member 6 from the substantially center. An elongated ridge 6b extending toward the end is formed. Then, a front protrusion 6c and a rear protrusion 6d having a triangular cross section are juxtaposed on the linear top of the raised portion 6b. The knock member 7 is similarly provided with a raised portion 6b, a front projection 6c, and a rear projection 6d.

  When using the writing instrument 1, when the knock member 6 is pushed down, the knock member 6 moves along the central axis L direction of the shaft tube 4. At this time, an engagement portion (not shown) provided at the rear end portion of the knock member 6 engages with an engagement receiving portion (not shown) provided in the guide groove 10, and the knock member 6 of the refill 2 is engaged. It is stopped and it becomes a writable state (refer FIG. 1). The release of the writable state is performed by lightly pressing either the remaining knock member 6 or the clip 8.

  When the remaining knock member 6 or the clip 8 is pushed down, the front projection 6c of the pushed knock members 6 and 7 is locked to the knock member 6 (in other words, the protruding ballpoint pen refill 2 is attached). The rear protrusion 6d of the knock member 6) is pushed outward from the central axis L of the shaft cylinder 4, and the locked state (in other words, the writable state) of the locked knock member 6 is released. . Then, the knock member 6 quickly returns to the steady state by the biasing force of the spiral spring 15. At this time, the knock member 6 returns to a state substantially parallel to the central axis L.

  In this way, when the knock member 6 is pushed down, the rear end portion of the knock portion 6 (not shown) and the shaft cylinder 4 are engaged, and the knock member 6 is slightly inclined outward with the flange portion at the tip as a bending point. When the knock member 6 returns, the finger hooking portion 6a protrudes outward, and the knock member 6 returns to a state substantially parallel to the central axis L. That is, when the knock member 6 is pushed down, the knock member 6 and the refill 2 are not in a straight line, but have a relationship of inclining outwardly with a collar as a bending point. This is because the finger hooking portion 6 a of the knock member 6 is pulled inward and the rear end portion of the knock portion 6 (not shown) and the shaft cylinder 4 are engaged, and the knock member 6 is the inner peripheral surface 4 e of the shaft cylinder 4. This is because the tip opening 4d of the shaft cylinder 4 is formed in the center.

  Here, when the knock member 6 is pushed down, the spiral spring 15 used for the return of the knock member 6 is not in a straight line, and the hook member 6 and the refill 2 are not in a straight line. It is a relationship that is inclined to and is influenced by it. That is, the spiral spring 15 does not normally contract along the central axis of the spiral spring 15 but contracts while being distorted outward by a portion having the flange as a bending point. Furthermore, the helical springs 15 in the shaft tube 4 come closer to each other as the shaft tube 4 is made thinner by design change. In such cases, if the helical spring 15 is left to bend freely when the knock member 6 is pushed down, the helical springs 15 rub against each other when the knock member 6 is pushed down, and interference noise is likely to be generated. The same applies to the knock member 7.

  Therefore, as shown in FIGS. 3 to 5, the spring seat portion 20 provided on the knock member 6 for locking the helical spring 15 is positioned on the central axis L side of the shaft cylinder 4 and is spirally wound. The first spring seat portion 21 having the first spring seat surface 21a with which the end portion 15a of the spring 15 abuts is positioned on the inner peripheral surface 4e side of the shaft cylinder 4, and the end portion 15a of the spiral spring 15 is in contact with the first spring seat portion 21a. And a second spring seat portion 22 having a second spring seat surface 22a in contact therewith. The first spring seat surface 21a is positioned forward of the second spring seat surface 22a by a dimension H (for example, about 0.3 mm).

  Thus, since the first spring seat surface 21a is located in front of the second spring seat surface 22a, as shown in FIG. 6, when the knock member 6 is in a steady state, that is, the spiral spring 15 When there is no load, the end 15a of the spiral spring 15 mainly contacts the first spring seat surface 21a. On the other hand, as shown in FIG. 7, when the knock member 6 is pushed down against the spring force, the spiral spring 15 is continuously pressed mainly by the first spring seat surface 21a. It can be bent so as to bulge outward, that is, toward the inner peripheral surface 4 e of the shaft cylinder 4.

  Accordingly, even when the shaft cylinder 4 is thinned, it is difficult to generate an interference sound generated by rubbing the spiral springs 15 with each other. Certainly, in the case of a multi-core writing instrument, the diameter of the barrel 4 is increased or the diameter of the spiral spring 15 is decreased by reducing the refill 2 to reduce friction between the spiral springs 15 when the knock member 6 is pushed down. Although it can be eliminated, if the refill 2 is made thinner, the amount of ink in the refill 2 must be reduced. As described above, the multi-core writing instrument 1 according to the present invention can make the shaft cylinder 4 thin while maintaining the thickness of the refill 2 and the amount of ink, and by eliminating friction between the spiral springs 15, The operational feeling of the knock member 6 is improved.

  Further, as shown in FIGS. 3 to 5, the first spring seat portion 21 includes first and second protrusions protruding toward the central axis L side of the shaft cylinder 4 behind the spring loading portion 6 </ b> A provided in the knock member 6. It consists of 2nd peak parts 21A and 21B. The first peak portion 21A and the second peak portion 21B are juxtaposed in the tangential direction of the spiral spring 15, and the pair of left and right first spring seat surfaces 21a are stable with respect to the end portion 15a of the spiral spring 15. Touch.

  Furthermore, the 1st and 2nd peak parts 21A and 21B are extended in the front-back direction of the knock member 6 like a rib. In other words, since the first and second peak portions 21A and 21B formed of resin extend in the direction in which the urging force of the spiral spring 15 is generated, the first and second peak portions 21A and 21B are not easily deformed by the urging force of the spiral spring 15, and Stable contact with the end 15a of the spring 15 is ensured.

  In addition, the gap S between the first peak portion 21A and the second peak portion 21B is formed from the front end opening of the rear shaft 4b of the shaft cylinder 4 to the other knock members 6, 7 when the multi-core writing instrument 1 is assembled. Is loaded, it has a function as a relief groove for inserting the front projection 6c and the rear projection 6d of the knock members 6, 7 being loaded.

  Since the knock member 7 also has the spring seat portion 20 equivalent to the knock member 6, detailed description thereof is omitted.

  Furthermore, as shown in FIG. 2, the spiral spring 15 is formed with end turns 15A and 15B only at both ends. The spiral spring having the end wound portion in the middle is difficult to be forced to be bent outward by the first spring seat portion 21 of the knock member 6 and the spiral springs 15 may be rubbed together. In the multi-core writing instrument 1 in which the knock members 6 and 7 having the spring seat portion 20 having the seat surface 21a are employed, the spiral spring 15 having no intermediate seat winding portion is used.

  Needless to say, the present invention is not limited to the embodiment described above, and the multi-core writing instrument 1 may be one in which a mechanical pencil type refill is accommodated in the shaft tube 4.

It is sectional drawing which shows one Embodiment of the multi-core writing instrument which concerns on this invention. It is a perspective view which shows the knock member, helical spring, and refill applied to the multi-core writing instrument which concerns on this invention. It is a side view which shows a refill. It is a principal part expansion perspective view of a refill. It is sectional drawing which follows the VV line of FIG. It is sectional drawing which shows the relationship between the knock member in a steady state, and a helical spring. It is sectional drawing which shows the relationship between the knock member in a knocked state, and a helical spring.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Multi-core writing instrument, 2 ... Refill, 4 ... Shaft cylinder, 6 ... Knock member, 6A ... Spring loading part, 15 ... Spiral spring, 15A, 15B ... End winding part, 20 ... Spring seat part, 21 ... 1st Spring seat, 21a ... first spring seat, 21A ... first peak, 21B ... second peak, 22 ... second spring seat, 22a ... second spring seat, L ... center Axis.

Claims (3)

A plurality of refills selectively appearing from the tip of the shaft tube,
A plurality of knock members having a front end connected to a rear end of each refill and slidable in a direction of a central axis of the shaft cylinder;
And a helical spring which is disposed so as to be wound around the refill, and has one end locked to the shaft cylinder and the other end locked to the knock member to return the knock member. In the core writing instrument,
The knock member is provided with a spring seat for locking the helical spring,
The spring seat is
A first spring seat portion located on the central axis side of the shaft cylinder and having a first spring seat surface with which the other end of the spiral spring comes into contact;
A second spring seat portion located on the inner peripheral surface side of the shaft cylinder and having a second spring seat surface with which the other end of the spiral spring abuts.
The multi-core writing instrument, wherein the first spring seat surface is located in front of the second spring seat surface.   The first spring seat portion includes first and second peak portions projecting toward the central axis of the shaft cylinder behind a spring loading portion provided in the knock member, and the first peak portion. The multi-core writing instrument according to claim 1, wherein the second peak portion is juxtaposed.   The multi-core writing instrument according to claim 1 or 2, wherein the spiral spring has end winding portions formed only at both ends.

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