JP2018144421A - Knock type writing instrument - Google Patents

Abstract

PROBLEM TO BE SOLVED: To stably reduce the sound when the rotor is locked.SOLUTION: A knock type writing instrument comprises: a barrel 10; a knock body 20 projecting from a rear end of the barrel 10; a rotor 30 engaged by forward movement and rotation in the barrel 10 by a pressing operation on the knock body 20; a center core 40 causing a writing portion 41 to project from a front end of the barrel by the forward movement; and a center core receiver 60 connecting the center core 40 to the rotor 30. The center core receiver 60 has: a cylindrical portion 61 fitted to an outer peripheral portion on the rear end side of the center core 40; and a connecting portion 62 extending rearward from the cylindrical portion 61 and connected to the rotor 30. The cylindrical portion 61 is provided with: penetrating portions 61c penetrating a peripheral wall of the cylindrical portion 61 at two spaced locations; and a flexible piece portion 61d positioned between the penetrating portions 61c and is integrated with the peripheral wall of the cylindrical portion 61. The flexible piece portion 61d is provided with a sliding contact projection 61d1 projecting in the radial outer direction of the barrel and making sliding contact with an inner circumferential surface of the barrel 10.SELECTED DRAWING: Figure 6

Description

  The present invention relates to a knock-type writing instrument in which a rotor is rotated so that a writing portion protrudes and retracts from a front end of a shaft cylinder.

Conventionally, in this type of writing instrument, as described in Patent Document 1, for example, a shaft tube, an operation portion protruding from the rear end of the shaft tube, and a forward operation in the shaft tube by a pressing operation on the operation portion are performed. There is known a knock type writing instrument including a rotor that is locked by rotation and a refill that is connected to the front end side of the rotor and that causes the writing portion to protrude from the front end of the shaft cylinder by the advancement.
By the way, since the conventional knock type writing instrument has a structure in which the rotor is rotated and locked vigorously, a sound is generated at the time of locking. This locking sound may be annoying to the user and the surrounding people depending on the usage environment, such as in a relatively quiet room or during a meeting.
Therefore, for example, in the invention described in Patent Document 2, a rotation suppression member that abuts on the inner wall surface of the shaft cylinder is provided on the rotation cam, and the rotational force of the rotation cam or the like is determined by the frictional resistance between the rotation suppression member and the inner wall surface of the shaft cylinder. The rotation speed is reduced.

JP 2004-209881 A JP 2009-255427 A

  However, according to the latter prior art, the frictional resistance between the rotation suppression member and the inner wall surface of the shaft cylinder also varies due to the dimensional variation and the material of the rotation suppression member. There is also a possibility that the rotational speed, the locking sound, etc. may vary.

In view of such problems, the present invention has the following configuration.
A shaft cylinder, a knock body projecting from the rear end of the shaft cylinder, a rotor that moves forward and rotates within the shaft cylinder by a pressing operation on the knock body, and a writing portion that moves the writing section forward by the advancement. A core that protrudes from the core, and a core receiver that connects the core to the rotor, the cylinder receiver being fitted to a rear end side outer peripheral portion of the core, and the cylinder A connecting portion that extends rearward from the rotor and is connected to the rotor. The cylindrical portion includes a penetrating portion that penetrates the peripheral wall of the cylindrical portion at two spaced locations, and the penetrating portions. And both ends of the crossing direction with respect to the direction in which the through portions are arranged are integrated with a peripheral wall of the cylindrical portion, and the flexible piece is provided in the outer direction of the shaft cylinder diameter. A knock-type writing instrument, wherein a sliding contact projection is provided that protrudes and contacts the inner peripheral surface of the shaft cylinder.

It is a whole sectional view showing an example of a knock type writing instrument concerning the present invention. An example of a core receiver is shown, (a) is a side view, (b) is a half sectional view. 3A is a cut end view taken along line IIIa-IIIa in FIG. 2, and FIG. 3B is a cut end view taken along line IIIb-IIIb in FIG. FIG. 3 is a left side view with respect to FIG. FIG. 5 is a cut end view taken along line VV in FIG. 4. It is a principal part expanded sectional view of the same knock-type writing instrument, (a) shows the state which accommodated the writing part, (b) shows the state which protruded the writing part.

In the present embodiment, the following features are disclosed.
The first feature is that the shaft cylinder, a knock body protruding from the rear end of the shaft cylinder, a rotor that is advanced and rotated in the shaft cylinder by a pressing operation on the knock body, and the forward movement A cylinder having a writing core projecting from the front end of the cylinder and a core holder for connecting the core to the rotor, the cylinder holder being fitted to the outer periphery of the rear end of the core And a connecting portion that extends rearward from the cylindrical portion and is connected to the rotor. The cylindrical portion penetrates the peripheral wall of the cylindrical portion at two spaced locations. And a bending piece portion that is located between the through portions and that is integrated with the peripheral wall of the cylindrical portion at both ends in the crossing direction with respect to the arrangement direction of the through portions. A sliding contact protrusion is provided that protrudes outward in the shaft tube diameter and contacts the inner peripheral surface of the shaft tube.
According to these configurations, the frictional resistance between the sliding contact projection and the inner peripheral surface of the shaft tube can be stabilized by the bending of the bending piece portion.

  As a second feature, the two through portions are spaced in the axial direction of the shaft cylinder so as to further stabilize the frictional resistance between the sliding contact projection and the inner peripheral surface of the shaft cylinder when the rotor rotates. (See FIG. 2).

  As a third feature, the sliding contact protrusion is provided near the center in the intersecting direction, and the sliding contact protrusion protrudes outward in the axial tube diameter from the other portion of the tube portion (see FIG. 2). .

  As a fourth feature, in order to stabilize the amount of bending of the bending piece portion, the cylindrical portion has a fitting portion that fits to the outer peripheral surface of the core near the rear end of the inner peripheral surface. The flexure piece is disposed in front of the fitting portion, and a gap is provided between the flexure piece and the outer peripheral surface of the core (see FIG. 2).

  As a fifth feature, the bending piece portion has a thickness in the axial tube radial direction from a portion of the sliding contact projection between the sliding contact projection and a connection portion to the peripheral wall of the cylindrical portion in the intersecting direction. Has a thin thin portion (see FIG. 3A).

<Specific Embodiment>
Next, specific embodiments having the above characteristics will be described in detail with reference to the drawings.
In addition, in this specification, a shaft cylinder axial direction means the direction where the centerline of a shaft cylinder extends. “Front” means one side of the axial direction of the cylinder and the tip direction of the writing portion. Further, “rear” means a direction opposite to the one side in the axial direction of the shaft cylinder. The “axial cylinder radial direction” means a direction orthogonal to the axial cylinder axis direction. Further, the “outward direction of the shaft tube diameter” means a direction away from the center of the shaft tube along the shaft tube diameter direction. The “inner cylinder radial direction” means a direction approaching the center of the axial cylinder along the axial cylinder radial direction.

FIG. 1 shows an example of a knock-type writing instrument according to the present invention.
The knock type writing instrument 1 includes a shaft cylinder 10, a knock body 20 protruding from the rear end of the shaft cylinder 10, and a rotor that is locked by being advanced and rotated in the shaft cylinder by a pressing operation on the knock body 20. 30, a core 40 that causes the writing portion 41 to protrude from the front end of the shaft cylinder by advancement, a biasing member 50 that biases the core 40 backward, and a core receiver 60 that connects the core 40 to the rotor 30. When the knock body 20 is pressed forward, the writing portion 41 is protruded and locked from the front end of the shaft tube 10, and the knock body 20 is again pressed forward in this locked state. To cancel.

The shaft cylinder 10 is annularly attached to a long cylindrical main body cylinder 11, a tapered cylindrical tip 12 threadedly connected to the distal end side of the main body cylinder 11, and a grasped part on the front end side of the main body cylinder 11. The elastic grip 13 and the cam cylinder 14 fitted to the inner peripheral surface on the rear end side of the shaft cylinder 10 so as not to advance and retreat and to rotate are integrally formed.
The shaft cylinder 10 is composed of a plurality of members as described above. As another example, a part or all of the main body cylinder 11, the tip 12, the elastic grip 13, and the cam cylinder 14 are integrated. It can be a member.

  The cam cylinder 14 is formed in a substantially cylindrical shape, and on its inner peripheral surface, a slide groove that guides a knock body 20 and a rotor 30 (to be described later) in the advancing and retracting direction, a cam slope that rotates the rotor 30 when moving forward, It has a locking surface or the like for contacting and locking the rotor 30 rotated by a predetermined amount.

The knock body 20 is a bottomed cylindrical member whose rear end is closed, and is fitted to the cam cylinder 14 so as to be able to advance and retreat and to be unrotatable. Move forward.
The knock body 20 is provided with a ridge that fits in the slide groove of the cam cylinder 14 and is guided back and forth, a cam slope for rotating the rotor 30, and the like.

The rotor 30 is a substantially cylindrical member that is supported so as to be able to advance and retreat in the cam cylinder 14 and to be rotatable in a state where the rear half side is inserted into the knock body 20.
When the rotor 30 is pressed by the knock body 20 and moves forward by a predetermined amount, the rotor 30 is rotated and locked. When the rotor 30 is pressed again by the knock body 20, the locked state is released.
The rotor 30 is provided with an engaging portion that is guided by being fitted in a slide groove of the cam cylinder 14 and a rear end portion of the engaging portion, so that the cam slope of the knock body 20 and the cam slope of the cam cylinder 14 are provided. A cam slope or the like that is slidably contacted is provided.

According to the illustrated example, the core 40 is a refill for a ballpoint pen, and a writing unit 41, which is a ballpoint pen tip, is connected to the front end of a long cylindrical ink tank 42.
The rear end side of the center core 40 is received by the rotor 30 via the center core receiver 60.

  The urging member 50 is a compression coil spring. The front end of the biasing member 50 is locked to the stepped portion in the shaft tube 10, and the rear end is locked to the stepped portion of the outer peripheral surface of the ink tank 42. Is energized backward.

According to the configuration so far, when the knock body 20 is knocked in the retracted state of the writing unit 41, the rotor 30 moves forward by a predetermined amount, and the writing unit 41 protrudes from the front end of the shaft tube 10, The rotor 30 further rotates by a predetermined amount and is locked to the cam cylinder 14.
Further, when the knocking body 20 is knocked in the protruding state of the writing unit 41, the locking state of the rotor 30 is released, and the rotor 30 rotates by a predetermined amount and moves backward. The writing unit 41 is immersed in the shaft tube 10.
As described above, for example, the refill advance / retreat unit mechanism described in Japanese Patent Application Laid-Open No. 2004-209881 and other well-known mechanisms are applied to the rotating cam mechanism that causes the writing unit 41 to appear and retract by the rotation and advance / retreat of the rotor 30. Is possible.

Further, the center core receiver 60 is connected to the cylindrical portion 61 fitted with a gap s with respect to the outer peripheral surface of the rear end side of the core 40, and extended rearward from the cylindrical portion 61 to be inserted into the rotor 30. And a stepped cylindrical shape having an enlarged diameter on the front half side.
The material of the core receiver 60 may be any material that elastically bends a later-described bending piece 61d such as a hard synthetic resin material.

  The cylinder portion 61 is formed in a substantially cylindrical shape having an inner diameter larger than the outer diameter of the ink tank 42. On the inner peripheral surface of the cylindrical portion 61, a vertical rib-shaped fitting portion 61a (FIG. 2B) is provided on the rear end side, and further on the rear side of the fitting portion 61a is the core 40. A protruding receiving portion 61b that receives the rear end is provided.

A plurality of fitting portions 61a are provided at intervals in the circumferential direction (see FIG. 4). Each fitting portion 61a protrudes inwardly in the axial direction of the shaft cylinder on the rear end side of the inner peripheral surface of the cylindrical portion 61 and extends in the axial direction of the axial tube. It is close to or in contact with the outer peripheral surface of the core 40.
The fitting portion 61a and the center core 40 are fitted with a mode in which the center core 40 is loosely fitted to the extent that the core core 40 can be attached and detached, and there is a slight gap between the outer periphery of the center core 40. Including the fitted aspect.

  The receiving portion 61b is a protrusion that protrudes radially inward from an inner peripheral surface that is reduced in diameter on the rear rear side in the cylindrical portion 61, and a plurality of receiving portions 61b are provided at intervals in the circumferential direction (see FIG. 4). Each receiving portion 61b is in contact with the rear end portion of the core 40 and receives the core 40.

  In addition, the cylindrical portion 61 includes through portions 61c and 61c that penetrate the peripheral wall at two positions spaced apart in the front-rear direction, and both end portions in the axial cylinder circumferential direction that are positioned between the through portions 61c and 61c are cylindrical portions. The bending piece part 61d integrated with the peripheral wall of 61 and the cylinder part main body 61e which is cylindrical parts other than these penetration part 61c and the bending piece part 61d are provided.

  As shown in FIGS. 2 (a) and 2 (b), the through portion 61c is a through hole that penetrates the peripheral wall of the cylindrical portion 61 in the radial direction and is elongated in the axial cylindrical circumferential direction.

The bending piece 61d extends in the axial direction between the front and rear through-holes 61c and 61c, and protrudes outward in the axial direction of the axial cylinder toward the center of the extending direction. A slidable contact protrusion 61d1 that is in slidable contact with the inner peripheral surface of the tube 14 is provided, and thin portions 61d2 and 61d2 are provided between the slidable contact protrusion 61d1 and a connection portion with respect to the peripheral wall of the tube portion 61.
The circumferential lengths of the bent piece 61d and the through-hole 61c are substantially the same.

The bending piece 61d is positioned on the front side of the shaft cylinder with respect to the protruding end portion in the radial direction in the fitting portion 61a. And the clearance gap s is ensured between the inner surface of this bending piece part 61d, and the core 40 outer peripheral surface.
In addition, the bending piece 61d has a width W closer to the center in the circumferential direction of the shaft cylinder, which is narrower than the width on both ends. That is, as shown in FIG. 2A, the end edge 61d3 of the bending piece portion 61d is concavely curved in a substantially arcuate shape in the circumferential direction of the shaft cylinder.
According to these configurations, the bending piece 61d can be sufficiently bent in the radially inward direction.

The sliding contact protrusion 61d1 protrudes in the radially outward direction from other portions (including the thin portion 61d2) on the outer peripheral surface of the cylindrical portion 61. The projecting end surface of the sliding contact projection 61d1 is formed in a convex curved shape along the inner peripheral surface of the cam cylinder 14 in the shaft cylinder 10, and is in pressure contact with the inner peripheral surface of the cam cylinder 14.
More specifically, as shown in FIG. 3B, the outer diameter D of the sliding contact projection 61d1 is larger than the outer diameter of the thin portion 61d2, and further larger than the outer diameter of the cylindrical portion main body 61e. In addition, it is set slightly larger than the inner diameter of the cam cylinder 14.

  C-chamfered or R-chamfered chamfered portions 61d11 are provided at the front and rear ends of the sliding contact projection 61d1, respectively.

The thin portion 61d2 is a portion that is thinner than the wall thickness of the sliding contact protrusion 61d1 portion and thinner than the wall thickness of the cylindrical portion main body 61e.
The thin portion 61d2 bends inward in the radial direction when the sliding contact protrusion 61d1 is pressed against the inner peripheral surface of the cam cylinder 14, and appropriately adjusts the frictional resistance between the sliding contact protrusion 61d1 and the cam cylinder 14.

Moreover, the connection part 62 is formed in the cylindrical shape according to the example of illustration (refer FIG. 2). The connecting portion 62 is press-fitted and fixed to the inner peripheral surface on the front end side of the rotor 30.
Therefore, the center core receiver 60 can rotate integrally with the rotor 30 and can advance and retreat in the cam cylinder 14.

Next, the characteristic operation effect of the knock type writing instrument 1 having the above configuration will be described in detail.
In the initial position, as shown in FIG. 6 (a), the center core 40 is urged rearward by the urging member 50, the writing portion 41 is located in the shaft cylinder 10, and the rotor 30 and the center core receiver 60 is stationary near the rear end in the shaft cylinder 10.
When the knock body 20 moves forward by a pressing operation from the outside, it is pushed by the knock body 20 and the rotor 30 moves forward, and the core receiver 60 moves forward integrally with the rotor 30.

As described above, when the rotor 30 and the core receiver 60 are moved forward by a predetermined amount, the rotor 30 and the core receiver 60 are rotated by a predetermined amount by the rotary cam mechanism described above, locked in the cam cylinder 14, and the writing unit 41 protrudes from the front end of the shaft cylinder 10. Is maintained in a writable state (see FIG. 6B).
During the rotation, the sliding contact projection 61d1 of the center core receiver 60 is pressed against the inner peripheral surface of the cam cylinder 14 and receives an appropriate frictional resistance.
Therefore, the rotational speeds of the rotor 30 and the core receiver 60 are reduced, and the generation of sound when the rotor 30 is locked in the cam cylinder 14 can be suppressed.

  Further, when the knock body 20 is pushed again in the protruding state of the writing unit 41, the locked state of the rotor 30 is released and the rotor 30 rotates by a predetermined amount. The sound generated at this time can also be reduced by the frictional resistance of the sliding contact projection 61d1.

Therefore, according to the knock type writing instrument 1 having the above-described configuration, it is possible to reduce the generation of sound accompanying the rotation of the rotor 30.
Moreover, since the bending piece 61d is appropriately bent while the sliding contact protrusion 61d1 is in sliding contact with the inner peripheral surface of the cam cylinder 14, there is some variation in the radial dimension of the core receiver 60. Even so, the frictional resistance between the sliding contact projection 61d1 and the inner peripheral surface of the cam cylinder 14 can be prevented from varying, and a certain quality can be maintained.

  In addition, according to the said embodiment, although the bending piece part 61d was provided between the penetration parts 61c arranged in a shaft cylinder axial direction as a preferable aspect, as another example, the penetration part 61c is provided in a shaft cylinder circumferential direction. It is also possible to arrange them so that a bent piece 61d is provided between them.

  Moreover, according to the said embodiment, although the bending piece part 61d was formed in the doubly-supported beam shape where the both ends were connected to the cylindrical part 61 surrounding wall as a preferable aspect, as another example, the bending piece part 61d is the It is also possible to form a cantilever shape in which only one end side is connected to the peripheral wall of the cylindrical portion 61.

  Moreover, according to the said embodiment, although the core receiver 60 and the rotor 30 were each comprised as a different body, as another example, it is also possible to make these core receiver 60 and the rotor 30 into an integral structure. It is.

  In addition, this invention is not limited to the embodiment mentioned above, In the range which does not change the summary of this invention, it can change suitably.

1: Knock type writing tool 10: Shaft cylinder 20: Knock body 30: Rotor 40: Center core 41: Writing section 60: Center core receiver 61: Tube section 61a: Fitting section 62: Connection section 61c: Through section 61d: Deflection One part 61d1: Sliding contact protrusion 61d2: Thin part s: Gap

Claims (5)

A shaft cylinder, a knock body projecting from the rear end of the shaft cylinder, a rotor that moves forward and rotates within the shaft cylinder by a pressing operation on the knock body, and a writing portion that moves the writing section forward by the advancement. A core that protrudes from the core, and a core receiver that connects the core to the rotor,
The core receiver has a cylindrical portion fitted to the outer peripheral portion on the rear end side of the central core, and a connecting portion that extends backward from the cylindrical portion and is connected to the rotor,
The cylindrical portion includes a penetrating portion that penetrates the peripheral wall of the cylindrical portion at two spaced locations, and an end portion that is located between the penetrating portions and that intersects the direction in which the penetrating portions are arranged. A bending piece integrated with the peripheral wall of the shaft, and a sliding contact protrusion that protrudes outward in the axial direction of the shaft cylinder and is in sliding contact with the inner peripheral surface of the shaft cylinder. Knock-type writing instrument.   The knock-type writing instrument according to claim 1, wherein the two through portions are provided at intervals in the axial direction of the cylinder. The flexible piece portion has the sliding contact projection closer to the center in the intersecting direction,
The knock-type writing instrument according to claim 1 or 2, wherein the sliding contact protrusion protrudes outward from the other portion of the cylinder portion in the axial cylinder diameter direction.   The cylindrical portion has a fitting portion that fits to the outer peripheral surface of the core near the rear end of the inner peripheral surface, and the flexible piece portion is disposed in front of the fitting portion, and the flexible piece. The knock type writing instrument according to any one of claims 1 to 3, wherein a gap is provided between the portion and the outer peripheral surface of the core.   In the crossing direction, the flexible piece portion has a thin wall portion between the sliding contact projection and a connection portion with respect to the peripheral wall of the cylindrical portion, whose thickness in the axial tube radial direction is thinner than that of the sliding contact projection. The knock-type writing instrument according to claim 3 or 4, characterized in that:

Images