JP2008302672A - Multilead writing instrument - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a multilead writing instrument for which the improvement of the sitting stability of a spiral spring, and the slipping off prevention for a refill can be achieved by a simple constitution. <P>SOLUTION: In this multilead writing instrument, a spring loading section 20 is enlarged by installing a second front end surface 21b, which functions as a release for the rear end of the refill 2, on the front end surface 21 of the spring loading section 20, and thus, a gap between the inner periphery of the spiral spring 15 and the outer periphery of the spring loading section 20 can be made as small as possible, and the sitting stability of the spiral spring 15 can be further increased. Then, since the shaking of the spiral spring 15 to the spring loading section 20 can be made as small as possible, the spiral springs 15 and 16 being close to each other in a barrel 4 become hard to collide, and the generation of noises when the spiral springs 15 and 16 hit each other is eliminated. In addition, the slipping off of the refill 2 when a knocking section 11 and the refill 2 form a V-shape can surely be prevented from occurring. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a multi-core writing instrument provided with a knock portion that is slidable in the axial direction of a shaft cylinder.

  Conventionally, as a technology in such a field, there is Japanese Utility Model Publication No. 4-60492. The multi-core writing instrument described in this publication selectively protrudes and protrudes the tip of the ballpoint pen and the tip of the mechanical pencil from the opening of the tip of the shaft cylinder by sliding the sliding part (knock part) in the axial direction of the shaft cylinder. It is a multifunctional writing instrument that can be made to work. In such a writing instrument, when the sliding portion is pushed down, the sliding portion and the mechanical pencil body (pencil-type refill) are not in a straight line but are in a relation of “<”. This is because the base end side of the sliding portion is drawn inward, the sliding portion is disposed on the outer periphery of the shaft tube, and the tip opening of the shaft tube is formed in the center. In addition, when the sliding portion does not swing the refill, the refill is forcibly bent, and an unnecessary load is applied to the refill. Therefore, in order to achieve the swinging motion of the sliding portion, in the conventional multi-core writing instrument, a ball portion is provided at the tip of the sliding portion, and a cylindrical ball receiving portion is attached to the rear end of the refill. The ball portion is fitted in the recess of the receiving portion.

Japanese Utility Model Publication No. 4-60492 Japanese Utility Model Publication No. 5-12185

  However, in the conventional multi-core writing instrument described above, if the sliding part and the mechanical pencil body (pencil type refill) form a “<” shape, the outer edge of the ball receiving part provided at the rear end of the refill Is strongly pressed against the end face of the sliding portion. Therefore, a ball receiving portion with a device such as a rounded edge or increased strength is required, and the swing structure is complicated. In addition, if the sliding part and the mechanical pencil body (pencil-type refill) have a “<” shape, a large gap is created between the end face of the sliding part and the end face of the ball receiving part. As can be seen from the above, the ball portion is easily removed from the concave portion of the ball receiving portion. Furthermore, in the sliding part, since the end face against which the rear end of the refill hits and the end face against which the coil spring hits are the same, there is a large gap between the end face of the sliding part and the end face of the ball receiving part. There is a possibility that the coil spring may be caught between the end surface of the sliding portion and the end surface of the ball receiving portion. This is because the seating stability of the coil spring is deteriorated due to the gap described above.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a multi-core writing instrument that achieves improvement in seating stability of a helical spring and prevention of refill removal with a simple configuration.

A multi-core writing instrument according to the present invention includes a plurality of refills selectively projecting and projecting from the tip of the shaft tube, a plurality of knock portions connected to the rear ends of the respective refills and slidable in the axial direction of the shaft tube, and the refill In a multi-core writing instrument having a helical spring that is arranged so as to be wound around the shaft, one end is locked to the shaft cylinder, and the other end is locked to the knock portion, and the knock portion is restored.
The knock portion is formed on the front end side, and is inserted into the opening on the rear end side of the spiral spring, and protrudes forward from the front end surface of the spring load portion, and the rear end side of the refill A refill loading portion inserted into the opening of
The front end surface of the spring loading portion extends substantially perpendicular to the extending direction of the knock portion, and is a first front end surface that abuts against the rear end surface of the refill, and the first end surface inside the front end surface of the spring loading portion. And a second front end face that is set back from the front end face of the first feature.

  In this multi-core writing instrument, in order to improve the seating stability of the spiral spring, a spring loading portion is formed on the knock portion side, but the second front end surface functioning as a relief at the rear end of the refill is used as the spring loading portion. By providing it on the front end surface of the spring, it is possible to increase the size of the spring loading portion, to reduce the gap between the inner periphery of the spiral spring and the outer periphery of the spring loading portion as much as possible, and to further increase the seating stability of the spiral spring Can do. Further, since the backlash of the spiral spring with respect to the spring loading portion is reduced as much as possible, it is difficult for the spiral springs that are close to each other in the shaft tube to collide with each other, and noise is not generated when the spiral springs hit each other. Furthermore, when the knock part and the refill form a "<" shape, the gap between the rear end face of the refill and the front end face of the spring loading part can be reduced, so that the refill can be reliably prevented from coming off. Can do.

Further, it is preferable that the spring loading portion has a substantially semi-cylindrical shape having a flat portion inside.
The spring loading part can be made into a cylindrical shape, but by adopting a spring loading part of a substantially semi-cylindrical shape, the flat part can function as a relief of the rear end of the refill, and the adoption of a refill with a large diameter It becomes possible.

Further, the knock portion is further provided with a spring seat surface that contacts the rear end of the spiral spring, and the spring seat surface preferably extends perpendicular to the longitudinal direction at the rear end of the spring loading portion.
With such a configuration, the spring seat surface is enlarged in combination with the enlargement of the spring loading portion, and the seating stability of the spiral spring can be further improved.

  According to the present invention, it is possible to improve the seating stability of the spiral spring and prevent the refill from being removed with a simple configuration.

  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 composite type having a three-color ball-point pen-type refill and a mechanical pencil-type refill. This knock type multi-core writing instrument 1 includes three ball-point pen-type refills 2, one mechanical pencil-type refill 3, a resin shaft 4 that accommodates the refills 2 and 3, and a shaft 4 A protrusion 4c integrally formed at the end, a cylindrical eraser 6 loaded in the protrusion 4c, and a resin cap attached to the rear end of the shaft cylinder 4 so as to cover the eraser 6 7, an openable and closable clip 8 that is slidable in the direction of the axis L of the shaft tube 4, and a non-slip grip 9 fixed to the shaft tube 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 portions 11 slide along the three guide grooves 10 a of the four guide grooves 10, and each knock The tip of the part 11 is inserted into the rear end of the refill 2. The openable clip 8 is movable in the direction of the axis L along the remaining one guide groove 10b, and the tip of the resin knock 13 connected to the clip 8 via the U-shaped leaf spring 12 is It is inserted into the rear end of the mechanical pencil type refill 3, and the knock portion 13 slides along the guide groove 10b.

  Furthermore, spiral springs 15 and 16 for returning the knock portion 11 and the clip 8 are accommodated in the shaft cylinder 4, and the refills 2 and 3 are inserted into the spiral springs 15 and 16. In order to generate a restoring force in the knock part 11 and the clip 8, 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 by the tip of the knock part 11, One end of 16 is locked by the shaft cylinder 4, and the other end of the spiral spring 16 is locked to the tip of the knock portion 13.

  In the composite writing instrument 1 having such a configuration, the tip of the ball-point pen can be protruded from the tip opening 4d of the shaft tube 4 by pushing down one of the knock portions 11 with a finger, and the clip 8 is pushed down with the belly of the finger. The tip of the mechanical pencil can be protruded from the tip opening 4 d of the shaft tube 4 through the knock portion 13. The refills 2 and 3 that are selectively protruded from the shaft cylinder 4 can store the tip of the refill 2 or the refill 3 in the shaft cylinder 4 by gently pressing down the knock portion 11 or the clip 8 with a finger. it can.

  As shown in FIG. 2, a finger hook portion 11 a is formed on the outer side of the knock portion 11 having a flat and elongated shape, and on the inner side (axis L side) of the knock portion 11 from the substantially center toward the rear end. An elongated elongate bulge 11b is formed. A front protrusion 11c and a rear protrusion 11d having a triangular cross section are arranged in parallel on the linear top of the raised portion 11b. The knock portion 13 is similarly provided with a raised portion 11b, a front projection 11c, and a rear projection 11d.

  As shown in FIG. 1, when using the writing instrument 1 having such a configuration, for example, the knock portion 11 is pushed down. Then, the knock part 11 moves along the axis L direction of the shaft cylinder 4. At this time, an engagement portion (not shown) provided at the rear end portion of the knock portion 11 and an engagement receiving portion (not shown) provided in the guide groove 10 are engaged, and the knock portion 11 of the ballpoint pen refill 2 is engaged. Is locked, and writing is possible (see FIG. 1). The release of the writable state is performed by lightly pressing one of the remaining knock portions 11 and 13. When the remaining knock portions 11 and 13 are pushed down, the front protrusions 11c of the pushed knock portions 11 and 13 are locked to the knock portion 11 (in other words, the knock to which the protruding ballpoint pen refill 2 is attached). The rear protrusion 11d of the portion 11) is pushed outward from the axis L of the shaft cylinder 4, and the locked state (in other words, the writable state) of the locked knock portion 11 is released. Then, the knock portion 11 is restored by the urging force of the spiral spring 15. At this time, the knock portion 11 returns to a state substantially parallel to the axis L.

  Thus, when the knock portion 11 is pushed down, the finger hook portion 11a of the knock portion 11 is pulled inward, the knock portion 11 is slightly tilted, and when the knock portion 11 is restored, the finger hook portion 11a protrudes outward, and the knock portion 11 returns to a state substantially parallel to the axis L. Further, when the knock portion 11 is pushed down, the knock portion 11 and the refill 2 are not in a straight line, but are in a relation of “<”. This is because the finger hook portion 11a of the knock portion 11 is drawn inward, the knock 11 is disposed on the outer periphery of the shaft tube 4, and the tip opening 4d of the shaft tube 4 is formed in the center. ing.

  In the multi-core writing instrument 1 having a plurality of knock parts 11 and 13, it is necessary to appropriately swing the knock parts 11 and 13 with respect to the refills 2 and 3. If not, the refill 2 is forced to bend, and an unnecessary load is applied to the refill 2. In particular, since the refill 2 filled with water-based ink has a large diameter and is difficult to bend, the swinging operation of the knock portion 11 is essential. Further, if the refill 3 is bent without proper swinging of the knock portion 13 connected to the clip 8, the replacement core A contained in the refill 3 is easily broken.

  Therefore, in order to achieve an appropriate swinging motion of the knock portions 11 and 13, the front end side shape of the knock portions 11 and 13 is characterized. As shown in FIGS. 3 and 4, the knock portion 11 is formed on the front end side, and the spring loading portion 20 inserted from the opening 15 a (see FIG. 2) on the rear end side of the spiral spring 15, and the spring In addition to projecting forward from the front end surface 21 of the loading unit 20, a bowl-shaped refill loading unit 22 inserted from the opening 2 a (see FIG. 2) on the rear end side of the refill 2 is provided. The tip of the refill loading portion 22 is provided with a substantially quadrangular pyramid shaped press-fit portion 22a that is press-fitted into the refill 2, and the knock portion 11 performs a swinging motion with the press-fit portion 22a as a fulcrum.

  A front end surface 21 of the spring loading portion 20 extends substantially orthogonal to the extending direction of the knock portion 11, and a first front end surface 21 a that abuts on the rear end surface 2 b of the refill 2, and the spring loading portion 20. And a second front end face 21b that recedes from the first front end face 21a inside the front end face 21 (on the axis L side). Note that the second front end face 21b is retracted about 0.5 mm stepwise with respect to the first front end face 21a.

  In this multi-core writing instrument 1, the spring loading portion 20 is formed on the knock portion 11 side in order to improve the seating stability of the spiral spring 15, but the second front end that functions as a relief of the rear end of the refill 2. By providing the surface 21b on the front end surface 21 of the spring loading unit 20, the spring loading unit 20 can be enlarged, and the gap between the inner periphery of the spiral spring 15 and the outer periphery of the spring loading unit 20 can be reduced as much as possible. Further seating stability of the spiral spring 15 can be enhanced. Further, the backlash of the spiral spring 15 with respect to the spring loading portion 20 is reduced as much as possible, so that the spiral springs 15 and 16 that are close to each other in the shaft cylinder 4 are unlikely to collide with each other, and the spiral springs 15 and 16 meet each other. Occurrence of abnormal noise is eliminated.

  Furthermore, when the knock portion 11 and the refill 2 form a “<” shape, the gap between the rear end surface 2 b of the refill 2 and the front end surface 21 of the spring loading portion 20 can be reduced. The disconnection can be prevented with certainty.

  A flange portion 24 adjacent to the spring loading portion 20 is formed in the knock portion 11, and a substantially C-shaped spring seat surface 24 a that contacts the rear end 15 b of the spiral spring 15 is provided on the flange portion 24. Yes. The spring seat surface 24a extends perpendicularly to the longitudinal direction of the knock portion 11 at the rear end of the spring loading portion 20. With such a configuration, the spring seat surface 24a is increased in size with the increase in the size of the spring loading portion 20, and the seating stability of the spiral spring 15 is further improved.

  As shown in FIG. 5, the spring loading portion 20 has a substantially semi-cylindrical shape, a flat portion 20 a located on the inner side (axis L side), a planar side surface 20 b parallel to each other, and the helical spring 15. It consists of a curved surface 20c having substantially the same diameter as the inner diameter. Although the spring loading portion 20 can be formed into a columnar shape, by making the spring loading portion 20 into a substantially semi-cylindrical shape, the flat portion 20a can function as a relief of the rear end of the refill 2 and a refill having a large diameter. Can be adopted.

  In addition, since it has the structure equivalent to the knock part 11 also about the shape of the front-end | tip part of the knock part 13, detailed description is abbreviate | omitted.

  Needless to say, the present invention is not limited to the embodiment described above, and the multi-core writing instrument 1 may be a ballpoint pen-type refill.

It is sectional drawing which shows one Embodiment of the multi-core writing instrument which concerns on this invention. It is a disassembled perspective view which shows a knock part, a spiral spring, and a refill. It is an expansion perspective view which shows the front-end | tip part of a knock part. It is sectional drawing which shows the swing operation | movement of a knock part. It is sectional drawing which follows the VV line of FIG.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Multi-core writing instrument, 2, 3 ... Refill, 2a ... Refill opening, 2b ... Rear end surface of refill, 4 ... Shaft, 11, 13 ... Knock part, 15, 16 ... Spiral spring, 15a ... Opening of spiral spring , 15b ... rear end of the spiral spring, 20 ... spring loading part, 20a ... flat part, 21 ... front end face, 21a ... first front end face, 21b ... second front end face, 22 ... refill loading part, 24 ... flange Part, 24a ... spring seat surface, L ... axis.

Claims (3)

A plurality of refills selectively appearing from the tip of the shaft tube,
A plurality of knock portions connected to the rear ends of the respective refills and slidable in the axial direction of the shaft cylinder;
And a helical spring that is disposed so as to be wound around the refill, has one end locked to the shaft cylinder, and the other end locked to the knock portion, and returns the knock portion. In the core writing instrument,
The knock part is
A spring loading portion formed on the front end side and inserted into an opening on the rear end side of the spiral spring;
A refill loading portion that protrudes forward from the front end surface of the spring loading portion and is inserted into an opening on the rear end side of the refill,
The front end surface of the spring loading portion is
A first front end surface extending substantially perpendicular to the extending direction of the knock portion, and abutting a rear end surface of the refill;
A multi-core writing instrument comprising: a second front end surface that is recessed from the first front end surface inside the front end surface of the spring loading portion.   The multi-core writing instrument according to claim 1, wherein the spring loading portion has a substantially semi-cylindrical shape having a flat portion on the inside.   The knock portion is further provided with a spring seat surface that contacts the rear end of the spiral spring, and the spring seat surface extends perpendicularly to the longitudinal direction at the rear end of the spring loading portion. The multi-core writing instrument according to claim 1 or 2.

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