JP6608265B2 - Writing instrument - Google Patents

Description

  The present invention relates to a writing instrument, and more particularly, to a writing instrument that can avoid or reduce damage to a writing core unit due to high writing pressure.

  Conventionally, when writing with a mechanical pencil, if a high writing pressure is applied to the writing lead (lead lead), the writing lead exposed from the tip of the base is easily broken. . When the writing pressure is constant, the writing core breaks down as the angle between the axial direction of the mechanical pencil barrel and the paper surface becomes smaller (so that the barrel is laid down), or the writing lead exposed from the tip of the base The longer the length is, the more conspicuous.

  With respect to such a problem, Patent Document 1 (Japanese Patent Application Laid-Open No. 2015-123869) discloses that when a high writing pressure is applied to the writing core, the axial component of the writing pressure and the writing pressure are perpendicular to the axial direction. A mechanical pencil is described in which components are absorbed by different mechanisms to reduce breakage of the writing core.

  Specifically, in the mechanical pencil of Patent Document 1, a base (holder) is supported by a shaft cylinder via an elastic body (coil spring), and the base is a cam slope whose diameter gradually decreases toward the rear in the axial direction. have. Further, the shaft tube is formed with a pressing portion that presses the cam inclined surface forward in the axial direction. With such a configuration, due to the component perpendicular to the axial direction of the pen pressure (force in the outer direction of the shaft cylinder diameter), the cam inclined surface of the base is pressed forward in the axial direction by the pressing portion of the shaft cylinder, and the shaft cylinder The base slides forward from the tip of the tip. Thereby, the length of the writing core exposed from the front-end | tip of a nozzle | cap | die is reduced.

  Furthermore, the mechanical pencil of Patent Document 1 is relatively moved in the axial direction in a state where the lead feeding unit for feeding out the writing lead is urged forward in the axial direction by the elastic body (coil spring) (the tip direction of the base in the axial direction). It is supported by the shaft cylinder as possible. The core feeding unit including the writing core moves relative to the axial tube rearward in the axial direction, whereby the axial component of the writing pressure is absorbed. As a result, the length of the writing core exposed from the tip of the base is further reduced, and the breakage of the writing core is reduced.

JP2015-123689

  In the mechanical pencil described in Patent Document 1, when the base slides (jumps out) due to a component perpendicular to the axial direction of the writing pressure (force in the outer direction of the shaft cylinder diameter), the axis of the writing core is Eccentric from the axis of the barrel.

  In contrast, the present inventor confirmed that there are many users who feel that the writing feeling is smooth when the eccentricity as described above does not occur.

  The present invention is based on the knowledge as described above, and its purpose is to avoid damage to the writing core unit (for example, breakage of the writing core) when a high writing pressure is applied to the writing core unit. At the same time, it is to provide a writing instrument with a smooth writing feeling.

  The present invention comprises a shaft tube, a base inserted through the opening at the front end of the shaft tube, and a writing core unit inserted through the base so as to be in contact with the inner peripheral surface of the base. The writing core unit is relatively movable in the axial direction of the axial cylinder with respect to the axial cylinder and the base, and the base is movable relative to the axial cylinder. Is a writing instrument that moves relative to the axial cylinder forward in the axial direction in response to relative movement of the writing core unit relative to the axial cylinder in the axially rearward direction.

  According to the present invention, when a high writing pressure is applied to the writing core unit, the writing core unit moves relative to the axial cylinder rearward in the axial direction, and the base is pivoted relative to the axial cylinder and the writing core unit. By relatively moving forward in the direction, the length of the writing core unit exposed from the base is reduced, and damage to the writing core unit (for example, breakage of the writing core in a mechanical pencil) can be avoided. Further, when the base moves relative to the axial cylinder and the writing core unit in the axial direction, the axis of the writing core unit and the axis of the axial cylinder remain aligned (the axis of the writing core unit is not eccentric). Therefore, a writing instrument with a smooth writing feeling can be provided.

  Preferably, the motion direction conversion is provided in the shaft cylinder, and moves the base relative to the shaft cylinder in the axial direction forward according to the relative movement of the writing core unit in the axial direction rearward relative to the shaft cylinder. The movement direction converting means further includes a swinging member that is in contact with a rear region of the base and is swingably supported in the shaft tube.

  In this case, the writing core unit moves relative to the axial tube rearward in the axial direction, so that the writing core unit swings the swinging member, whereby the swinging member causes the base to move forward in the axial direction with respect to the axial tube. Therefore, it is easy to convert the relative movement of the writing core unit in the axial rearward direction with respect to the axial cylinder into the relative movement of the mouth member in the axial direction relative to the axial cylinder.

  Preferably, the distance between the position where the mouth member contacts the swing member and the swing axis of the swing member and the swing of the swing member from the position where the writing core unit contacts the swing member. The distance to the axis is different.

  Alternatively, preferably, the movement direction conversion means moves the mouth member relative to the axial tube forward relative to the axial tube over an amount different from the relative movement amount of the writing core unit relative to the axial tube rearward in the axial direction. It is supposed to let you.

  In these cases, for example, the distance from the position at which the mouth member contacts the swing member to the swing axis of the swing member is greater than the position at which the writing core unit contacts the swing member. If the distance is larger than the distance to the moving axis, the mouth member can be moved relative to the axial tube forward relative to the axial tube over an amount greater than the relative movement amount of the writing core unit relative to the axial tube rearward. It is possible to suppress a decrease in writing feeling due to the relative movement of the writing core unit relative to the axial cylinder in the rearward direction. Alternatively, the distance from the position where the mouth member contacts the swing member to the swing axis of the swing member is the distance from the position where the writing core unit contacts the swing member to the swing axis of the swing member. If the distance is smaller than the distance, the mouth member can be relatively moved axially forward with respect to the shaft cylinder with a smaller writing pressure, so that even if the writing core unit is weak, damage to the writing core unit can be avoided. Can do.

  According to the present invention, when a high writing pressure is applied to the writing core unit, the writing core unit moves relative to the axial cylinder rearward in the axial direction, and the base is pivoted relative to the axial cylinder and the writing core unit. By relatively moving forward in the direction, the length of the writing core unit exposed from the base is reduced, and damage to the writing core unit (for example, breakage of the writing core in a mechanical pencil) can be avoided. Further, when the base moves relative to the axial cylinder and the writing core unit in the axial direction, the axis of the writing core unit and the axis of the axial cylinder remain aligned (the axis of the writing core unit is not eccentric). Therefore, a writing instrument with a smooth writing feeling can be provided.

It is a schematic longitudinal cross-sectional view of the writing instrument of one embodiment of this invention. It is a partial schematic longitudinal cross-sectional view of the front area | region of the said writing instrument in the state in which the writing pressure is not applied to the writing core unit of the writing instrument of FIG. It is a partial schematic longitudinal cross-sectional view of the front area | region of the said writing instrument in the state in which the writing pressure is applied to the writing core unit of the writing instrument of FIG. It is a schematic longitudinal cross-sectional view of the nozzle | cap | die in the writing instrument of FIG. It is a schematic longitudinal cross-sectional view of the front area | region of the core supply unit in the writing instrument of FIG. It is a schematic side view of the rocking | swiveling member in the writing instrument of FIG. It is a schematic plan view of the rocking | swiveling member in the writing instrument of FIG. It is a schematic side view of the modification of the rocking | fluctuation member of FIG. It is a schematic plan view of the modification of the sliding member of FIG.

  Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

  FIG. 1 is a schematic longitudinal sectional view of a writing instrument according to an embodiment of the present invention. 2 is a partial schematic longitudinal sectional view of a front region of the writing instrument in a state where no writing pressure is applied to the writing core unit of the writing instrument of FIG. 1, and FIG. 3 is a diagram of the writing instrument of FIG. It is a partial schematic longitudinal cross-sectional view of the front area | region of the said writing instrument in the state in which the writing pressure is applied to the writing core unit.

  As shown in FIGS. 1 to 3, the writing instrument in the present embodiment is a mechanical pencil 100. The mechanical pencil 100 is inserted into the shaft tube 10, the opening 31 at the front end of the shaft tube 10, and protrudes forward from the front end of the shaft tube 10, and the cap 50 is in contact with the inner peripheral surface of the cap 50. 50 and a writing core unit supported by the shaft cylinder 10 so as to protrude forward from the front end of the base 50. The writing core unit of the present embodiment will be described in detail later, but is embodied as a core feeding unit 40 including a writing core 70. In addition, the shaft cylinder 10 of the present embodiment is made of polycarbonate, and includes a rear shaft 20 and a front shaft 30 whose rear region is fixed (screwed) to a front region of the rear shaft 20.

  As shown in FIGS. 2 and 3, the core feeding unit 40 of the present embodiment includes a polypropylene core pipe 41 extending in the axial direction of the shaft tube 10 inside the shaft tube 10, and a core pipe 41. A brass chuck 43 fixed to the front end via a connector 49, a brass fastening ring 42 fitted on the front region of the chuck 43, an outer cylinder 45 surrounding the chuck 43, and the outer cylinder 45 A return spring 44 for urging the core pipe 41 axially rearward, and a tip member 46 surrounding the front end region of the outer cylinder 45 and provided with a through hole for guiding the writing core 70. .

  A brass cap 50 is attached to the tip region of the lead feeding unit 40. FIG. 4 is a schematic vertical cross-sectional view of the base 50 of the present embodiment. As shown in FIG. 4, the base 50 of the present embodiment includes a cylindrical front region 51 and a sleeve-shaped rear region 52 whose outer diameter is larger than the outer diameter of the front region 51. . As shown in FIG. 4, the front region 51 has a tapered front end portion 51 a that tapers toward the front (left side in FIG. 4), and the base 50 is attached in the shaft tube 10. The front end portion 51a projects forward from the front end of the shaft tube 10 (front shaft 30). An outer surface of a connection portion between the front region 51 and the rear region 52 is a tapered step portion 53 that is tapered forward. As shown in FIG. 4, the rear end edge of the rear region 52 is provided with a protrusion 54 that protrudes rearward in the axial direction (rightward in FIG. 4) in a part of the circumferential direction. Note that the material of the base 50 is not limited to brass, and can be made of other materials such as resin as long as it has a predetermined strength.

  Next, FIG. 5 is a schematic longitudinal sectional view of the front region of the lead feeding unit 40 in the mechanical pencil 100 of FIG. As shown in FIG. 5, the above-described tip member 46 has a pressing portion 47 that protrudes rearward in the axial direction (rightward in FIG. 5) at a part of the rear end edge in the circumferential direction. As shown in FIG. 5, the outer surface of the tip member 46 has a plurality of step portions that taper forward in the axial direction, and has a shape that fits the inner surface (see FIG. 4) of the base 50 as a whole. doing. Accordingly, in the state where the tip member 46 is positioned in the base 50, the axial movement of the axial tube 10 relative to the base 50 is allowed in the axial direction, and rattling of the tip member 46 in the base 50 is prevented. It has come to be. Further, the inner peripheral surface of the front region of the tip member 46 is provided with a stepped portion 46a having a flat surface directed rearward in the axial direction. As will be described later, the writing lead 70 from the lead feeding unit 40 is provided. When extended, the relative movement of the fastening ring 42 in the axial direction relative to the tip member 46 is restricted.

  Returning to FIG. 1 to FIG. 3, in the shaft cylinder 10 of the present embodiment, the base 50 is moved into the shaft cylinder 10 and the core feeding unit 40 by a force in the axial direction rearward of the shaft cylinder 10 applied to the core feeding unit 40. In contrast, a moving direction converting means for relatively moving in the axial direction is provided. Specifically, the movement direction conversion means of the present embodiment is embodied as a swinging member 60 that is in contact with the base 50 and the core feeding and feeding unit 40 and is swingably supported within the shaft tube 10. .

  6 is a schematic side view of the oscillating member 60 of the mechanical pencil 100 of FIG. 1, and FIG. 7 is a schematic plan view of the oscillating member 60 of the mechanical pencil 100 of FIG. As shown in FIGS. 6 and 7, the swinging member 60 of the present embodiment has an annular swinging body 61 as a whole, and for fixing the swinging member 60 in the shaft tube 10 so as to be swingable. And a columnar fixed convex portion 62. Specifically, the two fixing members 62 of the present embodiment are provided on the outer peripheral surface of the rocking body 61 in such a positional relationship that a straight line connecting the two fixing members 62 does not pass through the center of the ring. ing.

  Returning to FIG. 1 to FIG. 3, the base 50 of the present embodiment is arranged in the shaft tube 10 with the front end portion 51 a protruding forward from the front end of the shaft tube 10 as described above. Further, the tip member 46 is fitted in the base 50 so as to be relatively movable in the axial direction while being fitted and fixed to the outer cylinder 45 of the core feeding unit 40. Further, an inner flange 32 is provided at the front end of the shaft tube 10 (front shaft 30) of the present embodiment, and a retractable coil spring 33 is provided between the inner flange 32 and the stepped portion 53 of the base 50. Arranged in a compressed state. That is, the base 50 is biased axially rearward with respect to the shaft tube 10 by the biasing force of the coil spring 33.

  Further, as shown in FIG. 1, the swinging member 60 is swingably supported behind the base 50 and the tip member 46 in the axial direction. Specifically, two recesses (not shown) are provided in the circumferential direction on the inner peripheral surface of the shaft tube 10 at the same position in the axial direction of the shaft tube 10, and the swing member 60 is provided in these recesses. The two fixed projections 62 are engaged with each other. The swinging member 60 is restricted from relative movement in the axial direction with respect to the shaft tube 10 by the engagement, and can swing around the swinging axis line connecting the two fixed convex portions 62.

  In the present embodiment, as shown in FIGS. 1 and 2, the rear end of the pressing portion 47 of the tip member 46 and the rear end of the protruding portion 54 of the base 50 are caused by the biasing force of the coil spring 33. It is pressed against one end and the other end. That is, the swing axis of the swing member 60 is located between the position where the base 50 contacts the swing portion 61 and the position where the pressing portion 46 of the writing core unit 40 contacts the swing body 61. Yes. In this state, the swing member 60 is parallel to a plane perpendicular to the axis of the shaft tube 10. Further, in the present embodiment, the distance from the position where the protruding portion 54 of the base 50 contacts the swinging body 61 to the swing axis of the swinging member 60 is such that the pressing portion 47 of the writing core unit 40 is the swinging body. The distance from the position in contact with 61 to the swing axis of the swing member 60 is greater.

  With the configuration as described above, as shown in FIG. 3, when a force toward the axially rearward direction is applied to the lead feeding unit 40 and the tip member 46 by the writing pressure applied to the writing lead 70, the force is applied to the pressing portion. 47 is transmitted to one end of the oscillating body 61, and further transmitted to the base 50 via the other end of the oscillating body 61.

  As shown in FIG. 1, the lead feeding unit 40 further includes a knock portion 48 that is attached to the rear end of the lead pipe 41 and presses the lead pipe 41 forward in the axial direction against the outer cylinder 45. doing. The knock portion 48 of the present embodiment has a sleeve portion 48a fitted in the rear end region of the core pipe 41 in the axial front, and can remove the cylindrical eraser 80 in the axial rear. Holder part 48b to be held. The internal space of the sleeve portion 48a and the internal space of the holder portion 48b are communicated by an opening. Thus, by removing the eraser 80 from the holder portion 48b, the writing core 70 can be put into the core pipe 41 from the opening. A dome-shaped knob 81 that covers the back of the eraser 80 is detachably fitted to the holder portion 48b.

  Next, the operation of the mechanical pencil 100 of the present embodiment will be described.

  First, prior to writing on the paper, if necessary, the knob 81 and the eraser 80 are removed from the holder portion 48b, and the writing core 70 is formed through an opening that connects the sleeve portion 48a and the holder portion 48b. It is put into the core pipe 41. Then, the eraser 80 and the knob 81 are attached to the holder portion 48b, and the knock portion 48 (knob 81) is pressed forward in the axial direction against the shaft cylinder 10 (knock) with the front end of the base 52 directed downward. Is done. As a result, the core pipe 41, the connector 49, the chuck 43, the fastening ring 42, and the writing core 70 are moved relative to the axial tube 10 in the axial direction against the urging force of the return spring 44. In the middle of this relative movement, only the fastening ring 42 comes into contact with the contact step 46 a formed on the inner surface of the tip member 46. As a result, the fastening ring 42 is removed rearward from the chuck 43, the chuck 43 is released, and the writing core 70 is fed out.

  Then, when the pressing state of the knock portion 48 (knob 81) is released, the core pipe 41 is moved relative to the rear in the axial direction by the biasing force of the return spring 44 together with the chuck 43. Along with this, the fastening ring 42 is fitted again to the front region of the chuck 43, and the chuck 43 is fastened. Accordingly, the writing core 70 is held by the chuck 43 so as not to move relatively rearward in the axial direction, and the state where the writing core 70 is drawn out is maintained. Then, by repeating this series of pressing operations as appropriate, the writing core 70 is exposed (drawn out) for a desired length from the tip of the base 52 (see FIG. 2). Then, the front shaft 30 is gripped by the user, and writing is performed by moving the shaft tube 10 as desired while bringing the writing core 70 into contact with the paper surface.

  At the time of writing, the shaft tube 10 is generally gripped so that the axial direction forms an acute angle with respect to the paper surface (see FIGS. 2 and 3), but usually 45 ° with respect to the paper surface. An angle exceeding is maintained. For this reason, the writing pressure applied to the writing core 70 is greater in the axial component of the barrel 10 than in the component perpendicular to the axial direction.

  The mechanical pencil 100 according to the present embodiment reduces the length of the writing core 70 exposed from the tip of the base 50 by the axial component of the writing pressure when a high writing pressure is applied to the writing core 70 during writing. The breakage of the writing core 70 is avoided.

  Specifically, as shown in FIG. 3, when a force in the axial direction rearward is applied to the lead feeding unit 40 by the axial component of the pen pressure, the force is applied to the pressing portion 47 of the lead feeding unit 40. Thus, the swing member 61 is transmitted to the swing member 60 as a force that presses one end of the swing body 61 (the right end in FIG. 3) rearward in the axial direction of the shaft cylinder 10. This force is converted by the swing member 60 into a force in which the other end of the swing body 61 (the left end in FIG. 3) presses the base 50 forward in the axial direction. If the converted force is greater than a certain level, the other end of the oscillating body 61 opposes the urging force of the coil spring 33 to move the base 50 against the shaft tube 10 and the writing core 70 (core feeding unit 40). To move it forward in the axial direction. That is, the length of the writing core 70 exposed from the tip of the base 50 is reduced. In the present embodiment, the distance from the position where the protruding portion 54 of the base 50 abuts on the swinging body 61 to the swing axis of the swinging member 60 is such that the pressing portion 47 of the writing core unit 40 moves to the swinging body 61. Since the distance from the abutting position to the swing axis of the swing member 60 is larger than the distance from the contact position, it corresponds to a movement amount exceeding twice the movement amount when the writing core 70 moves relative to the axial tube 10 in the axial direction rearward. The writing core 70 is drawn into the base 50 over the length to be performed.

  When the axial component of the writing pressure applied to the writing core 70 is weakened, the base 50 is relatively moved rearward in the axial direction by the urging force of the coil spring 33, and the protruding portion 54 of the base 50 is moved by the oscillator 61. The other end is pressed rearward in the axial direction. As a result, one end of the oscillating body 61 presses the pressing portion 47 of the tip member 46 forward in the axial direction, and the lead feeding unit 40 including the writing core 70 moves relative to the base 50 and the axial tube 10 forward in the axial direction. It is done. As a result, the initial state before the writing core 70 is drawn into the base 50 is restored.

  According to the present embodiment as described above, when a high writing pressure is applied to the writing core 70, the core feeding unit 40 including the writing core 70 moves relative to the axial tube 10 rearward in the axial direction. At the same time, the base 50 moves relative to the core feeding unit 40 including the shaft cylinder 10 and the writing core 70 in the axial direction, whereby the length of the writing core 70 exposed from the base 50 is reduced, and the writing core 70 is broken. Can be avoided. Further, when the base 50 is moved relatively forward in the axial direction with respect to the core feeding unit 40 including the shaft cylinder 10 and the writing core 70, the axis of the writing core 70 and the axis of the shaft cylinder 10 remain coincident ( Since the axis of the writing core 70 is not decentered), the mechanical pencil 100 having a smooth writing feeling can be provided.

  The mechanical pencil 100 according to the present embodiment is provided in the shaft tube 10, and the base 50 is axially moved with respect to the shaft tube 10 in accordance with the relative movement of the core feeding unit 40 relative to the shaft tube 10 in the axial direction rearward direction. A rocking member 60 that is relatively moved forward is further provided. One end of the swing member 60 is in contact with the protruding portion 54 of the base 50, and the other end is in contact with the pressing portion 47 of the tip member 46. That is, the core feeding unit 40 moves relative to the shaft tube 10 in the axial direction rearward, and the pressing member 47 swings the swinging member 60, whereby the swinging member 60 moves the base 50 to the shaft tube 10. Therefore, it is easy to convert the relative movement of the lead feeding unit 40 in the axial rearward direction with respect to the axial tube 10 into the relative movement of the base 50 in the axial direction relative to the axial tube 10. is there.

  Further, the distance from the position where the base 50 contacts the swinging member 61 of the swinging member 60 to the swinging axis of the swinging member 60 is such that the lead feeding unit 40 contacts the swinging member 61 of the swinging member 60. It is larger than the distance from the position to the swing axis of the swing member 60. Therefore, the base 50 can be moved relative to the axial tube 10 forward in the axial direction over an amount that is more than twice the relative amount of axial movement of the lead feeding unit 40 relative to the axial tube 10 in the axial direction. Can be suppressed.

  In addition, for example, by appropriately changing the structure of the front end region of the lead feeding unit 40, a weight is attached to one end of the swinging body 61, and the gravity according to the inclination of the shaft cylinder 10 with respect to the horizontal plane at the time of writing. It is also possible to configure the base 50 to move forward in the axial direction with respect to the shaft tube 10 by the above action. Alternatively, even in a state where the shaft cylinder 10 is rotated around the axis as desired by configuring the rocking body 61 in a hollow annular shape and arranging a weight body (for example, a small metal ball) in the hollow region. The base 50 may be moved forward in the axial direction with respect to the shaft tube 10 by the action of gravity.

  In the present embodiment, the mechanical pencil 100 is exemplified as the writing instrument, but it can be widely used for writing instruments such as a ballpoint pen, a sign pen, a marker, a correction pen, and the like in which the writing portion protrudes from the front end of the shaft tube 10.

10 shaft cylinder 20 rear shaft 30 front shaft 31 front end 32 inner flange 33 coil spring 40 core feeding unit 41 core pipe 42 clamping ring 43 chuck 44 return spring 45 outer cylinder 46 tip member 46a abutting step portion 47 pressing portion 48 knocking portion 48a sleeve Portion 48b Holder 49 Connector 50 Base 51 Front region 52 Rear region 53 Step 54 Projection 60 Oscillating member 61 Oscillating body 62 Fixed projection 70 Writing core 80 Eraser 81 Knob 100 Mechanical pencil 260 Oscillating member 261 Oscillating body 262 Fixed Convex

Claims (4)

A barrel,
A base inserted through the opening at the front end of the shaft tube;
A writing core unit inserted through the base so as to be in contact with the inner peripheral surface of the base;
With
The base is movable relative to the shaft tube in the axial direction of the shaft tube,
The writing core unit is movable relative to the shaft tube and the base in the axial direction of the shaft tube,
The base moves relative to the axial tube relative to the axial tube relative to the axial tube relative to the axial tube, and moves relative to the axial tube forward .
A motion direction converting means provided in the shaft cylinder, and configured to relatively move the base in the axial direction relative to the shaft cylinder in accordance with a relative movement of the writing core unit in the axial direction rearward relative to the shaft cylinder; Prepare
A writing instrument characterized by that. Before SL motion direction converting means is in contact with the rear region of the mouthpiece, writing instrument according to claim 1, characterized in that it has a pivotably supported swinging member to the shaft within the cylinder. The distance from the position where the base comes into contact with the swing member to the swing axis of the swing member, and the distance from the position where the writing core unit contacts the swing member to the swing axis of the swing member The writing instrument according to claim 2, wherein and are different from each other. The movement direction conversion means moves the base relative to the axial tube relative to the axial tube over an amount different from an axially rearward relative movement amount of the writing core unit relative to the axial tube. The writing instrument according to any one of claims 1 to 3 .

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