JP2015110296A - Writing instrument - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a writing instrument capable of performing efficient operation by enabling pressurization of an ink by twisting a barrel of the writing instrument, and having a simple constitution by dispensing with a cap in pressurization operation.SOLUTION: By twisting a rear shaft 22 with respect to a front shaft 20, a pressurizing member 18 gives an applied pressure to a refill 14, and a writing tip 12 of the refill 14 is projected. Hereby, a slide pin 24 projecting to the rear end outer peripheral of the front shaft 20 is slid in the stored state in a slide groove 26 of the rear shaft 22.

Description

  The present invention relates to a part-time pressurization type writing instrument capable of pressurizing ink at a desired time during writing.

  There are various types of writing instruments that have a mechanism to pressurize the ink in the ink storage tube so that it can be smoothly ejected from the writing tip when writing upward or writing ink with high viscosity in the ink storage tube. Proposed.

  For example, in Japanese Patent Application Laid-Open No. 2004-175083 (Patent Document 1), ink having a viscosity of 50 to 2000 mPa · s is accommodated in an ink containing tube having a ballpoint pen tip at the tip, and the pressure on the rear end side of the ink containing tube is changed to a piston. A ball-point pen that pressurizes ink by pressing the member to 5 to 80 kPa (50 to 800 hPa) is disclosed.

  Japanese Patent Application Laid-Open No. 2007-98712 (Patent Document 2) discloses a method in which a cap that covers a writing chip when not in use is attached to a piston member at the rear end of the shaft cylinder, and the piston member is pressed through the cap to perform ink. An applicator that pressurizes the pressure in the rear space of the storage tube to 10 kPa (100 hPa), presses the ink, and removes the cap, thereby communicating the rear space of the ink storage tube with the outside air and releasing the pressurized state. It is disclosed.

JP 2004-175083 A JP 2007-98712 A

  However, in the above-mentioned Patent Documents 1 and 2, the operation of projecting the writing chip and the operation of pressurizing the ink are different, and there is a waste of operation. In particular, it is difficult to use a cap with a cap as in Patent Document 2 for a writing instrument without a cap.

  In view of such circumstances, the present invention enables easy and efficient operation by allowing ink to be pressurized by twisting the shaft tube of the writing instrument, and does not require a cap for the pressure operation, and the configuration is simple. We are going to provide a writing instrument that can be used.

The present invention provides a writing instrument in which a refill provided with a writing tip at the tip of an ink container is accommodated in a shaft cylinder.
It is a writing instrument characterized in that a pressure member that applies pressure to the refill by twisting the shaft tube is provided on the shaft tube.

  In the present invention, the pressure member is preferably provided with a flexible torsion member.

  Further, in the present invention, it is preferable that the pressure tip is applied and the pen tip of the writing tip can protrude from the tip of the shaft tube.

  In the present invention, it is preferable to be a rotary type in which the pressure member is pressurized by rotating the rear portion relative to the front portion of the shaft tube.

  According to the writing instrument of the present invention, the ink can be pressurized by twisting the shaft cylinder of the writing instrument, and a simple and efficient operation can be performed, and the configuration can be simplified by eliminating the need for a cap.

  The configuration can be simplified if the pressure member is provided with a flexible torsion member.

  Moreover, if it is set as a pressurization state and the pen tip of a writing chip is made into the structure which can protrude from a shaft cylinder front-end | tip, protrusion operation | movement and pressurization operation can be performed simultaneously.

  Also, if the rotary member that causes the pressure member to perform a pressure operation by rotating the rear portion with respect to the front portion of the shaft tube, the operation portion for pressurization can be integrally configured in the shaft tube, An excellent effect that the unity and the structure can be simplified can be obtained.

It is explanatory drawing at the time of writing chip accommodation of the writing instrument which concerns on embodiment of this invention, (a) is a side view, (b) is a longitudinal cross-sectional view of the state of (a), (c) is rotated 90 degrees from (a). It is the side view of the state made to do, (d) is a longitudinal cross-sectional view of the state of (c). It is explanatory drawing at the time of writing-tip protrusion of the said writing instrument, (a) is a side view, (b) is a longitudinal cross-sectional view of the state of (a), (c) is a side view of the state rotated 90 degrees from (a) (D) is a longitudinal cross-sectional view of the state of (c). It is explanatory drawing of the rear axis | shaft of the said writing instrument, (a) is a perspective view, (b) is a side view, (c) is a longitudinal cross-sectional view of the state of (b), (d) is rotated 90 degrees from (b). FIG. 6 is a side view of the state where the state is shown, and (e) is a longitudinal sectional view of the state (d). It is explanatory drawing of the front axis | shaft of the said writing instrument, (a) is a perspective view, (b) is a view from the front, (c) is a side view, (d) is a longitudinal cross-sectional view of the state of (c), (e ) Is a side view in a state rotated 90 ° from (c), (f) is a longitudinal sectional view in the state of (e), and (g) is a view from the rear. It is explanatory drawing of the connector of the said writing instrument, (a) is a view from the front, (b) is a side view, (c) is a side view rotated 90 degrees from (b), (d) is (c). The longitudinal cross-sectional view of a state, (e) is a perspective view, (f) is the view from back. It is explanatory drawing of the crown of the said writing instrument, (a) is a perspective view from the front, (b) is a side view, (c) is a longitudinal cross-sectional view of the state of (b), (d) is a perspective view from the back It is.

  Embodiments of the present invention will be described below with reference to the accompanying drawings.

  FIG. 1 and FIG. 2 are overall explanatory views of the writing instrument according to the embodiment in a state where the writing chip is retracted and a state where the writing chip is protruded.

  As shown in FIG. 1 and FIG. 2, the writing instrument contains a refill (writing refill) 14 in which a writing tip (writing part) 12 is provided at the tip of an ink container 10 in a shaft tube 16.

  The writing instrument is provided with a pressure member 18 that applies pressure to the refill 14 by twisting the shaft tube 16.

  The shaft tube 16 has a front hollow cylindrical front shaft 20 and a hollow cylindrical rear shaft 22 rotatable within a certain range with respect to the rear front shaft 20. The refill 14 is mounted in the hollow so as to be movable back and forth.

  Further, by twisting the rear shaft 22 with respect to the front shaft 20, the pressure member 18 applies pressure to the refill 14, and the rear end of the front shaft 20 in order to project the front end of the writing tip 12 of the refill 14. A sliding pin 24 protruding to the outer periphery is accommodated in the sliding groove 26 of the rear shaft 22 and slides.

(Rear shaft 22)
The rear shaft 22 has a cylindrical shape, and as shown in FIG. 3, a pair of sliding grooves 26 penetrates the side wall inwardly and outwardly in the form of a bend line inclined in the axial direction in the front portion.

(Front shaft 20)
As shown in FIG. 4, the front shaft 20 has a male screw 20a formed at the tip thereof, and the outer peripheral surface is flat and the inside is stepped from the center. A spring 28 (see FIG. 1) for urging the refill rearward is attached to the stepped portion 20b so as to abut.

  At the rear end of the front shaft 20, a pin hole 20c and a long hole 20d for inserting and fixing the sliding pin 24 are formed in pairs with the central axis interposed therebetween. A retaining pin 32 protruding from the outer periphery of the connector 30 described later is loosely fitted in the long hole 20d so as to be movable back and forth. Since the retaining pin 32 is loosely fitted in the long hole 20d, the relative rotation of the connector 30 with respect to the front shaft 20 is restricted.

  The male screw 20a at the tip of the front shaft 20 is screwed with a female screw on the inner periphery of a hollow, generally triangular pyramid-shaped mouth plug 34 that supports the writing tip 12 of the refill 14 from the side surface, and the male screw 20a The mouth plug 34 is fixed by screwing (see FIG. 1).

(Pressure member 18)
The pressurizing member 18 is a rotary type that causes the pressurizing member 18 to perform a pressurizing operation by rotating the rear shaft 22 of the rear portion with respect to the front shaft 20 of the front portion of the shaft cylinder 16.

  As shown in FIGS. 1 and 2, the pressurizing member 18 has a flexible tube body (possible between a connector 30 whose relative rotation is restricted by the front shaft 20 and a crown 36 fixed to the rear shaft 22. 38 corresponding to a flexible torsion member), and the tube body 38 is helically twisted by the displacement of the connector 30 and the crown 36 relative to each other in the relative rotational direction. The internal volume is reduced, the pressure is increased, and the pressure is increased from the rear with respect to the ink (which is also a coating liquid) in the ink container 10.

(Tube body 38)
The tube body 38 in the pressurizing member 18 has a front portion covering the outer periphery of the stepped portion 30 d of the rear portion of the connector 30 and a rear portion covering the base portion 36 b of the crown 36 and abuts the stepped portion. The airtight state of the tube body 38 and the connector 30 is open when the writing chip is accommodated, but is airtightly fixed by a rotating operation when the writing chip protrudes. The tube body 38 can be formed of a flexible and airtight resin film such as a silicone rubber or polypropylene film, a metal single layer, or a laminated film body.

(Connector 30)
As shown in FIG. 5, the connector 30 is a substantially cylindrical body having a stepped shape in which the vicinity of the central portion is thin on the inner peripheral surface and the vicinity of the central portion is thick on the outer peripheral surface. In the hollow interior, a step 30a is formed at the front and a step 30b is formed at the rear. Further, step portions 30c and 30d are formed before and after the outer periphery.

  As shown in FIGS. 1 and 2, when the refill 14 is attached to the connector 30, the connector 30 inserts the rear end portion of the refill 14 into the hollow hole of the front portion, and the front portion The rear end of the spring 28 is brought into contact with the step portion on the outer periphery of the front portion.

  A shaft-like piston portion 36a of the crown 36 is inserted into the rear portion of the connector 30 and is locked by the step portion 30b.

  Further, a pin hole 30e for fitting and fixing the retaining pin 32 is formed in the central side surface portion of the connector 30.

(Crest 36)
As shown in FIG. 6, the crown 36 has a piston portion 36a extending forward from a thick base portion 36b at the rear end.

  As shown in FIGS. 1 and 2, the crown 36 is attached by fixing the base 36 b of the crown 36 to the rear end of the rear shaft 22 and fixing the front end of the small-diameter piston portion 36 a to the connector 30. Is inserted into the hollow rear portion of the connector 30 and abuts against the stepped portion 30b inside the connector 30 to be locked.

(Operation of the writing instrument)
When the writing instrument is not used, the writing tip 12 is immersed in the front shaft 20 as shown in FIG. Inside the hollow rear part of the connector 30, there is a gap between the step part 30b and the front part of the piston part 36a of the crown 36 inserted therein. The length of the gap in the axial direction may be a distance that allows the pressure to be released when the rear shaft 22 is twisted from when the writing chip protrudes to when the writing chip is stored.

  On the other hand, when the writing instrument is used, the rear shaft 22 is rotated relative to the front shaft 20. Then, as shown in FIG. 2, the sliding pin 24 protruding from the outer periphery of the rear end of the front shaft 20 fits in the sliding groove 26 of the rear shaft 22 and slides, so that the sliding groove 26 is bent. The rear shaft 22 advances forward along the diagonal while rotating in a right-handed manner with respect to the front shaft 20.

  At that time, the crown 36 fixed to the rear shaft 22 also moves forward in accordance with the forward movement of the rear shaft 22. In the hollow rear part of the connector 30, the piston part 36 a of the crown 36 inserted therein advances, hits the step part 30 b with a certain degree of advance, and advances the connector 30. The refill 14 is advanced by the advance of the connector 30, and the front end of the writing tip 12 protrudes from the front end of the front shaft 20 so that writing can be performed. Since the sliding groove 26 has an appropriate locking structure along the circumferential direction when the rear shaft 22 advances to the forward end, the rear shaft 22 does not return to the original rotational position even if the force is removed. ing.

  At the same time, since the pressure member 18 is twisted, the tube body 38 is squeezed to reduce its internal volume, so that the internal pressure increases and the internal pressure of the rear portion of the ink container 10 of the refill 14 increases through the hollow of the connector 30. Ink is pushed out toward the writing chip 12. However, since it is only when the rear shaft 22 is operated, part-time pressurization is performed.

  Therefore, the writing instrument of the embodiment has a structure in which the pen tip of the writing tip 12 of the refill 14 can be protruded from the tip end of the tip shaft 20 of the shaft tube 16 while the tip 20 writing portion is in a pressurized state.

  According to the writing instrument of the embodiment, since the tube body 38 that applies pressure to the refill 14 is provided in the shaft cylinder 16 by twisting the shaft cylinder 16, the ink can be pressurized by twisting the shaft cylinder 16 of the writing instrument. In addition, since the cap is unnecessary for the pressurizing operation, the number of components can be reduced.

  Further, since the tube member 38 of a flexible torsion member is provided as the pressure member 18, the configuration can be simplified.

  In addition, since the pen tip of the writing tip 12 can be protruded from the tip of the shaft tube 16 while being in a pressurized state, the protruding operation and the pressing operation can be performed simultaneously.

  In addition, since the tube body 38 of the pressure member 18 is rotated by rotating the rear shaft 22 of the rear portion with respect to the front shaft 20 of the front portion of the shaft tube 16, Since the operation portion can be integrally formed with the shaft tube 16, a sense of unity and configuration can be simplified.

  Here, since the pressure can be applied each time the writing chip 12 is protruded (slight pressure of 100 hPa or less), the overwriting can be performed, and the drawn lines are more beautiful and the drawn line quality is improved as compared with the case where no pressure is applied.

An example of the twist angle and the applied pressure will be described.
In this example, the twist angle was 60 °, and the applied pressure was 50 hPa in relative atmospheric pressure. A silicone tube was used as the tube body 38 as a pressure member. The twist angle is 40 to 80 °, and the applied pressure at that time is preferably 10 to 100 hPa in relative atmospheric pressure. At that time, the applied pressure can be adjusted by the twist angle, that is, the twist amount.

  In addition, this invention is not limited to the said embodiment, A torsion member and the mechanism which twists it can be made into another thing.

  The writing instrument of the present invention can be used as a writing instrument that pressurizes low-viscosity ink and high-viscosity ink.

DESCRIPTION OF SYMBOLS 10 Ink container 12 Writing tip 14 Refill 16 Shaft cylinder 18 Pressing member 20 Front shaft 22 Rear shaft 24 Sliding pin 26 Sliding groove 28 Spring 30 Connector 32 Retaining pin 36 Crown crown 36a Crown crown 36b Crown crown Base 38 tube body (pressure member)

Claims (4)

In a writing instrument in which a refill provided with a writing tip at the tip of an ink container is accommodated in a shaft tube,
A writing instrument, wherein a pressure member that applies pressure to the refill by twisting the shaft tube is provided on the shaft tube.   The writing instrument according to claim 1, wherein the pressure member includes a flexible torsion member.   The writing instrument according to claim 1 or 2, wherein the writing tool has a structure in which the pen tip of the writing tip can be protruded from the tip of the shaft cylinder while being in a pressurized state.   The writing instrument according to any one of claims 1 to 3, wherein the writing instrument is a rotary type that causes the pressure member to perform a pressure operation by rotating the rear portion with respect to the front portion of the shaft cylinder.

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