JP4878138B2 - Knock-type writing instrument - Google Patents

Description

The present invention relates to a knock-type writing instrument in which a writing body can be projected and retracted from a tip end of a shaft cylinder by a knocking operation such as a ballpoint pen and a mechanical pencil.
Specifically, by pushing the knocking body, the rotor is moved forward in the axial direction along the middle piece, and then rotated in the circumferential direction to be locked. The present invention relates to a knock-type writing instrument in which a rotor is moved back along an axial direction.

  Conventionally, as this type of knock-type writing instrument, a knock body (operation unit) that can reciprocate in the axial direction in the shaft cylinder, a middle piece that is provided on the inner surface side of the shaft cylinder to face the knock body, and these knocks A rotor that rotates in the circumferential direction by engaging with the cam slope of the body and the cam slope of the middle piece, a return spring that urges the rotor rearward, and a writing body (refill) that interlocks with the rotor When the knock body is pressed, the ridge of the rotor is advanced in the axial direction along the slide groove of the middle piece, and after this ridge is removed from the slide groove, it slides along the cam slope of the knock body. The rotor protrusion is engaged with the engagement recess of the middle piece when the knock is returned after that, and then the rotor protrusion is engaged with the engagement state. Remove from the locking recess to release the locking state, and While rotating by sliding along the inclined cam face of the body, there is to retract in the axial direction is inserted into the slide groove of the middle frame (e.g., see Patent Document 1).

However, according to such a conventional knock-type writing instrument, the entire rotor is released and becomes free at the moment when the protrusion of the rotor is released from the slide groove of the middle piece by the knocking operation. In the knocking operation to move forward, a knocking sound is generated when at least the rotor ridge rotates while coming out of the slide groove of the middle piece, and when the rotor ridge enters the locking recess of the middle piece.
In addition, in the knocking operation for retracting the cursive body, at least when the ridge of the rotor rotates while coming out of the locking recess of the middle piece, and when the ridge of the rotor subsequently enters the slide groove of the middle piece, a knocking sound is generated. Will occur.
This so-called knocking sound is not unpleasant for the user himself because it also has a meaning of confirming the operating state (the cursive state of the cursive body), but may cause discomfort to others, for example, at the meeting In situations where the surrounding atmosphere is quiet, there is a problem that the knocking sound resonates and makes other people uncomfortable.
JP 2004-209881 A (page 6-7, FIG. 1-2)

  The present invention has been made in view of the above-described conventional circumstances, and an object thereof is to provide a knock-type writing instrument that can be switched between a knocking sound and a silent sound according to a user's request.

In order to solve the above-described problem, in the first invention, the pressing operation of the knock body (1) causes the rotor (3) to advance in the axial direction along the middle piece (2) and then rotate in the circumferential direction. In the knock type writing instrument in which the locked state is released and the rotor (3) is moved back in the axial direction along the middle piece (2) by the knocking operation again, the shaft cylinder (10) and the shaft A shaft (4) that is reciprocally movable in the axial direction in conjunction with the rotor (3) with respect to the cylinder (10) and is not rotatable in the circumferential direction;
The shaft cylinder (10) is provided so as not to rotate in the circumferential direction and not to move in the axial direction, and comes into contact with the rotor (3) when moving forward to rotate the rotor (3). And a fixed cam slope (6a) to be provided, and a knock changeover switch (7a) that is rotatable in the circumferential direction with respect to the knock body (1) is provided, and the knock changeover switch (7a) has a portion in the circumferential direction. A circumferential protrusion (7b) that protrudes forward, and is adjacent to the circumferential protrusion (7b) in the circumferential direction in a predetermined angle region on the rear end surface of the shaft body (4). In the angle area, a circumferential protrusion (4d) that is brought into contact with the circumferential protrusion (7b) is provided, and when the knock changeover switch (7a) is rotated to reach the predetermined angle area, the knock body (1 The cam slope (1a) directly against the rotor (3) Then, when the rotor (3) is pushed and rotated while the rotor (3) is in contact with the cam slope (2b) of the middle piece (2), the other angle region is obtained. Then, the peripheral protrusion (7b) of the knock changeover switch (7a) is brought into contact with the peripheral protrusion (4d) of the shaft body (4) to push the shaft body (4), and the shaft body (4) By moving the rotor (3) forward in conjunction with the rotor, a clearance (S) is secured between the cam slope (1a) of the knock body (1) and the rotor (3), and this clearance (S) The rotor (3) moved forward is brought into contact with the fixed cam slope (6a) and rotated while maintaining the above.
Further, in the second invention, by pushing the knock body (1), the rotor (3) is advanced in the axial direction along the middle piece (2) and then rotated in the circumferential direction to be locked again. In the knock-type writing instrument that releases the locked state by the knocking operation and moves the rotor (3) in the axial direction along the middle piece (2), the shaft cylinder (10) and the shaft cylinder (10) A shaft body (4) which is reciprocally movable in the axial direction in conjunction with the rotor (3) and is not rotatable in the circumferential direction, and is not rotatable in the circumferential direction with respect to the shaft cylinder (10); A fixed cam inclined surface (6a) that is provided so as not to move in the axial direction, and abuts against the rotor (3) when it moves forward to rotate the rotor (3); Is provided with a shaft changeover switch (7d) that is rotatable in the circumferential direction with respect to the other portion. The knock body (1) is provided so as to rotate integrally with the latch (7d), the knock body (1) is provided with a circumferential protrusion (7e) partially protruding forward in the circumferential direction, and The shaft (4) is adjacent to the circumferential protrusion (7e) in the circumferential direction in a predetermined angle region, and is contacted by the circumferential protrusion (7e) in other angular regions. When the projection (4d) is provided and the shaft switch (7d) is rotated to reach the predetermined angle region, the cam slope (1a) of the knock body (1) is directly connected to the rotor ( 3) abuts against the cam slope (2b) of the middle piece (2), and rotates the rotor (3) in contact with 3) to rotate, and the other angular region is obtained. In this case, the peripheral protrusion (7e) of the knock body (1) is brought into contact with the peripheral protrusion (4d) of the shaft body (4) so that the shaft body 4) is pushed, and the rotor (3) is moved forward in conjunction with the shaft (4), so that the cam slope (1a) of the knock body (1) and the rotor (3) are A clearance (S) is ensured, and while the clearance (S) is maintained, the advanced rotor (3) is brought into contact with the fixed cam slope (6a) to rotate.

The present invention has the following effects by the above configuration.
According to the first aspect of the present invention, when the knock slope is switched so that the cam slope of the knock body abuts the rotor, the knock is operated to advance the rotor along the middle piece on the cam slope of the knock body. When the rotor is moved in and out of the middle piece, a knocking noise is generated, and the knocking switch is used to switch so that a clearance is secured between the cam slope of the knocking body and the rotor, and then the knocking operation is performed. As a result, when the rotor is advanced along the middle piece while the cam slope of the knocking body and the rotor are kept in a non-contact state via the shaft body, the rotor forcibly enters and exits from the middle piece and rotates. No knocking sound is generated.
Therefore, it is possible to provide a knock-type writing instrument that can be switched between a knocking sound and a silent sound according to the user's request.
Therefore, in a quiet atmosphere such as a meeting according to the use situation, the knock operation can be silenced, and the knock operation can be performed with peace of mind without causing discomfort to others.

According to the second aspect of the present invention, the shaft changeover switch, in which a part of the shaft tube is rotatably provided in the circumferential direction with respect to the other part, is rotated, and the cam angle of the knock body is directly applied in the predetermined angle region. When the rotor is pushed in, a knocking noise is generated when the rotor enters and exits from the middle piece and rotates, and in other angular regions, the gap between the cam slope of the knocking body and the rotor in the shaft body When the knock body indirectly pushes the rotor while maintaining the above, the rotor is forced to enter and exit from the middle piece and rotate, so that no knocking sound is generated.
Therefore, the switching operation can be performed with a simple structure.
Therefore, the manufacturing cost can be reduced.

  As shown in FIGS. 1 to 20, the knock type writing instrument A of the present invention includes a knock body 1 that can reciprocate in the axial direction as a knock mechanism, a middle piece 2 that is disposed opposite to the knock body 1, A rotor 3 that is rotatable in the circumferential direction facing the piece 2, a shaft body 4 that is reciprocally movable in the axial direction in conjunction with the rotor 3, a spring 5 that biases the knock body 1 rearward, A front cam 6 that abuts on the rotor 3 to induce rotation and a switching means 7 for switching the operation state of the knocking operation are provided, and together with the knocking mechanism, a writing body 8 and a return spring 9 that urges it backward are provided. It is incorporated in the shaft tube 10.

  The knock body 1 is formed in a substantially bottomed cylindrical shape with the rear end face closed, and a cam slope 1a facing a rear cam slope 3b of a rotor 3 (described later) is continuously formed in a mountain shape in the circumferential direction on the front end face. Formed on the outer peripheral surface is a rotation restricting portion 1b that engages with a slide portion 2a of the middle piece 2 described later so as to be movable in the axial direction.

  The inner piece 2 has a plurality of slide portions 2a in the circumferential direction for guiding the rotation restricting portion 1b of the knock body 1 and the engaging portion 3a of the rotor 3 described later in the axial direction on the inner surface side of the shaft tube 10. Formed on the front end surfaces of these slide portions 2a are cam slopes 2b facing a rear cam slope 3b of the rotor 3 described later in a mountain shape in the circumferential direction, and between these cam slopes 2b. An engagement recess 2c that fits with a rear cam slope 3b of the rotor 3 to be described later is formed.

  The rotor 3 is formed in a cylindrical shape, is mounted at a position in the axial direction of a shaft body 4 to be described later, and is reciprocally movable in the axial direction. A plurality of engaging portions 3a that are movably engaged with each other in the axial direction are formed in the circumferential direction. A rear cam slope 3b that is in sliding contact and a front cam slope 3c that is in sliding contact with a fixed cam slope 6a of the front cam 6 described later are formed.

According to a preferred example of this embodiment, as shown in FIGS. 4, 5, 8 and FIGS. 14, 16, 19, the rotation restricting portion 1 b of the knock body 1 and the engaging portion 3 a of the rotor 3 are convex, The slide part 2a of the intermediate piece 2 engaged therewith is guided in the axial direction with a concave shape.
Further, as another preferred embodiment, on the contrary, the rotation restricting portion 1b of the knock body 1 and the engaging portion 3a of the rotor 3 are made concave, and the slide portion 2a of the intermediate piece 2 engaged therewith is made convex. It is also possible to guide in the axial direction.

  Further, the tail plug portion 10a is non-rotatably inserted into the rear end opening of the shaft tube 10, and the knock body 1 rotates as the slide portion 2a of the middle piece 2 on the inner peripheral surface of the tail plug portion 10a. A deep groove through which the restricting portion 1b and the engaging portion 3a of the rotor 3 can pass and a shallow groove through which the engaging portion 3a of the rotor 3 cannot pass are alternately recessed in the circumferential direction, and the front end of the shallow groove By making the surface into the engagement recess 2c, the assemblability when the knock body 1 is assembled in the middle piece 2 is improved.

  The shaft body 4 is formed with an insertion portion 4a which is smaller than the inner diameter of the knock body 1 and can be inserted therein on the rear end side, and the rear end side of the writing body 8 is detachably held on the front end side. The insertion portion 4b is formed and attached to the shaft tube 10 so as not to rotate in the circumferential direction, so that the reciprocating motion can be reciprocated only between the knock body 1 and the writing body 8 in the axial direction. .

  A concave portion 4c for rotatably supporting the rotor 3 is provided at a midway position in the axial direction of the shaft body 4 so that the rotor 3 is integrated in the axial direction. By inserting a spring 5 having a lower urging force than the return spring 9 from the shaft body 4 to the rear end portion of the knock body 1 or the shaft cylinder 10, the knock body 1 is urged rearward and written. When the body 8 protrudes, the knock body 1 is in a free state to prevent a rattling sound from being generated.

  Further, a circumferential projecting portion 4d is provided on the rear end surface of the insertion portion 4a of the shaft body 4 so as to be opposed to or fitted to circumferential projections 7b and 7e of the switching means 7 which will be described later. Projected partially.

  The front cam 6 is formed in a cylindrical shape, and is attached to the shaft tube 10 so as not to rotate in the circumferential direction and so as not to move in the axial direction, and is opposed to the front cam inclined surface 3c of the rotor 3 on the rear end surface. The fixed cam slope 6a is continuously formed in a mountain shape in the circumferential direction.

  According to a preferred example of the present embodiment, the front cam 6 and the shaft body 4 are connected to the tail plug portion 10a inserted in the rear end opening of the shaft tube 10 as shown in FIGS. It arrange | positions so that rotation is impossible, According to another preferable example, as shown in FIG.11,17,18, it arrange | positions so that it cannot rotate with respect to this tailplug part 10a and the rear axis | shaft 10d of the axial cylinder 10 mentioned later.

The switching means 7 causes the cam inclined surface 1a of the knock body 1 to abut against the rear cam inclined surface 3b of the rotor 3 by a knocking operation and directly advances the entire rotor 3 along the slide portion 2a of the intermediate piece 2. The knock body indirectly rotates the rotor while securing the clearance S between the cam slope 1a of the knock body 1 and the rear cam slope 3b of the rotor 3 via the shaft body 4 by direct pushing setting and knock operation. 3 is a switch for switching to either indirect push setting for moving 3 forward.
Embodiments of the present invention will be described below with reference to the drawings.

  In the first embodiment, as shown in FIGS. 1 to 10, the switching means 7 is a cap-like shape that is rotatable with respect to the knock body 1 within a predetermined angular range in the circumferential direction and is integrally inserted in the axial direction. A knock changeover switch 7a, and a circumferential projection 7b opposed to the circumferential projection 4d formed on the rear end face of the shaft body 4 is partially formed in the circumferential direction on the front end face of the cap-like knock changeover switch 7a. By projecting and rotating the knock changeover switch 7a in the circumferential direction, the circumferential projection 4d and the circumferential projection 7b are aligned, and the above-described direct push setting or indirect push setting is performed by a knock operation. The case where it can be switched to is shown.

  As shown in FIGS. 2A, 2B, and 3, the circumferential protrusion 4d of the shaft body 4 and the circumferential protrusion 7b of the changeover switch 7a are each formed in a sectional fan shape, for example. In the assembled state, the two are adjacent to each other in the circumferential direction in a predetermined angle region, and the two are overlapped in the other angle region, and the circumferential protrusion 7b of the changeover switch 7a is rotated in one of the circumferential directions. By doing so, it fits with the circumferential protrusion 4d and rubs against each other in the axial direction, and by rotating it in the opposite direction, the end faces of the circumferential protrusion 4d come into contact with each other and continue in the axial direction.

  That is, when the knock changeover switch 7a is rotated, the positional relationship between the circumferential projection 7b and the circumferential projection 4d of the shaft body 4 is adjacent to the circumferential direction as shown in FIGS. When the knock body 1 is pressed at this time, as shown in FIG. 9A, the circumferential protrusion 7b and the circumferential protrusion 4d are fitted together and rub against each other in the axial direction, so that the cam slope 1a of the knock body 1 is By abutting on the engaging portion 3a of the rotor 3, the direct pushing setting is made to push directly and advance.

  Further, as a result of the rotation operation of the knock changeover switch 7a, the positional relationship between the circumferential projection 7b and the circumferential projection 4d of the shaft body 4 coincides and overlaps in the circumferential direction as shown in FIGS. When the knocking operation is performed, as shown in FIG. 9B, the circumferential projection 7b and the circumferential projection 4d come into contact with each other, and the rotor 3 integrally supported in the axial direction by the shaft body 4 and the recess 4c At the same time that the knock body 1 is pushed by the knock changeover switch 7a formed with the circumferential protrusion 7b, the cam slope 1a of the knock body 1 and the rotor 3 are moved behind the shaft body 4. The knock body 1 is set to indirectly push the rotor 3 forward while securing the gap S with the side cam slope 3b.

  In the illustrated example, as shown in FIGS. 1-2 and 8-9, a display 7c is provided on each of the outer peripheral surface of the knock changeover switch 7a and the outer peripheral surface of the knock body 1, and when these displays 7c coincide with each other, a direct pressing is performed. By setting in advance to be indirect push setting when the display 7c does not match, it is possible to easily understand which setting state is visually or touched.

  Further, in the illustrated example, as shown in FIG. 1, the knock type writing instrument A of the present invention causes the writing tip 8 of the refill to appear and disappear from the tip end 10 b of the shaft tube 10 by pressing the knock body 1. This is a knock type ballpoint pen, and this shaft tube 10 is joined by screwing a front shaft 10c having a front end 10b and a rear shaft 10d continuous with a rear end thereof with an elastic gripping portion (grip) 10e interposed therebetween. is doing.

Next, the operation of the knock type writing instrument A will be described.
When the writing tip 8a of the writing body 8 protrudes from or is immersed in the tip end 10b of the shaft tube 10 shown in FIG. 1, the cap-like knock changeover switch 7a is rotated in the circumferential direction as the switching means 7. Switching between direct push setting and indirect push setting is possible.

  First, when the writing body 8 is immersed, when the knocking body 1 is pressed after switching to the direct pushing setting shown in FIGS. 2A and 9A, the cam slope 1 a of the knocking body 1 is moved to the rotor 3. It abuts against the rear cam slope 3b and directly pushes the rotor 3 forward.

By direct pushing of the knock body 1 by the cam slope 1a, the engaging portion 3a of the rotor 3 moves forward along the slide portion 2a of the intermediate piece 2, as shown in FIG. The engaging portion 3a is detached from the slide portion 2a as it is.
At the moment of removal, the entire rotor 3 is released and enters a free state.

As a result, the rear cam slope 3b of the rotor 3 slides and rotates along the cam slope 1a of the knock body 1 as shown in FIG. From the time when the engaging portion 3a of the rotor 3 comes off, a large knocking noise is generated during the period from when the rotor 3 slides along the cam inclined surface 1a and enters the inclined end portion 1a 'and stops rotating.
The knocking sound in this case is “click” when the rear cam slope 3b of the rotor 3 bounces the tip of the slide portion 2a of the middle piece 2 or hits the recess 1a ′ of the cam slope 1a. Sound is considered to be generated.

  Thereafter, when one press operation of the knock body 1 is completed, the knock body 1 and the rotor 3 are returned backward by the urging force of the spring 5 and the return spring 9, so as shown in FIG. 10 (a-3). The rear cam slope 3b of the rotor 3 slides along the cam slope 2b of the intermediate piece 2 and further rotates, and comes into contact with and engages with the engagement recess 2c, whereby the writing tip 8a of the writing body 8 is locked. Is held while protruding from the distal end 10b of the shaft tube 10.

A large knocking noise is also generated when the rear cam slope 3b of the rotor 3 enters the engaging recess 2c.
The knocking sound in this case is considered to be a “click” and a collision sound when the rear cam inclined surface 3b of the rotor 3 hits the engaging recess 2c.

In the subsequent knocking operation for retracting the writing body 8, the rear cam slope 3 b of the rotor 3 is moved from the engagement recess 2 c of the intermediate piece 2 by the advance of the cam slope 1 a of the knock body 1. Even when the knock body 1 slides and rotates along the cam slope 1a of the knock body 1, a large knocking sound (sounding sound) is generated from the rotor 3 in the free state.
Subsequently, when the engaging portion 3a of the rotor 3 enters the slide portion 2a of the middle piece 2, a loud knocking sound (collision sound) is generated.

  On the other hand, when the writing body 8 is immersed, when the knocking body 1 is pressed after switching to the indirect pushing setting shown in FIGS. 2B and 9B, the knocking body 1 is cammed via the shaft body 4. The knock body 1 indirectly pushes the rotor 3 forward while ensuring a gap S between the inclined surface 1a and the rear cam inclined surface 3b of the rotor 3.

By such indirect pushing, the engaging portion 3a of the rotor 3 moves forward along the slide portion 2a of the intermediate piece 2 as shown in FIG. The joint part 3a is forcibly removed.
The rear cam slope 3b of the detached rotor 3 is not in contact with the cam slope 1a of the knock body 1 and no rotational force acts on it, so that no knocking sound (sounding sound) is generated.

Subsequently, as shown in FIG. 10 (b-2), the front cam inclined surface 3c of the rotor 3 is forcibly brought into contact with the fixed cam inclined surface 6a of the front cam 6, and the sliding along the fixed cam inclined surface 6a is performed. Move and rotate.
At this time, a clearance S is secured between the cam slope 1 a of the knock body 1 and the rear cam slope 3 b of the rotor 3, so that the rotor 3 rotates regardless of the cam slope 1 a of the knock body 1.

Thereafter, when one pressing operation of the knock body 1 is completed, the knock body 1 and the rotor 3 are returned backward by the urging force of the spring 5 and the return spring 9, so as shown in FIG. 10 (b-3). The rear cam slope 3b of the rotor 3 slightly slides along the cam slope 2b of the middle piece 2 and further rotates, and comes into contact with and engages with the engagement recess 2c.
When the rear cam slope 3b of the rotor 3 enters the engaging recess 2c, a knocking sound (collision sound) may be generated. However, the rotor 3 remains in contact with the shaft body 4 in a completely free state. Therefore, the knocking sound (collision sound) at this time is extremely small.

  In the subsequent knocking operation for retracting the writing body 8, the cam slope 1 a of the knock body 1 and the rotor 3 are moved via the shaft body 4 by the advance of the cam slope 1 a of the knock body 1. While the clearance S with the rear cam slope 3b is maintained, the knock body 1 indirectly pushes the rotor 3 to advance, so that the rear cam slope 3b of the rotor 3 extends from the engagement recess 2c of the middle piece 2. The rotor 3 is forcibly pulled out, and the rear cam slope 3b of the rotor 3 is not in contact with the cam slope 1a of the knock body 1 and is not contacted with the rotational force.

Following this, the front cam inclined surface 3c of the rotor 3 is forcibly brought into contact with the fixed cam inclined surface 6a of the front cam 6 and is slid and rotated along the fixed cam inclined surface 6a. The engagement portion 3 a of the rotor 3 enters the slide portion 2 a of the middle piece 2 by being returned backward by the force.
When the engaging portion 3a of the rotor 3 enters the slide portion 2a of the middle piece 2, there is a possibility that a knocking sound (collision sound) may be generated, but the rotor 3 remains in contact with the shaft body 4 and is completely free. Since it does not become a state, the knocking sound (collision sound) is extremely small.

  As a result, it is possible to switch between a knocking sound and a silent sound according to a user's request by a simple operation, and to perform a switching operation with a simple structure.

  In the second embodiment, as shown in FIGS. 11 to 20, a shaft cylinder switch 7 d in which the switching means 7 is provided so that a part of the shaft cylinder 10 is rotatable with respect to the other part in a predetermined angular range in the circumferential direction. A peripheral projection 7e facing the peripheral projection 4d formed on the rear end surface of the shaft body 4 is partially projected in the circumferential direction in association with the shaft switch 7d. By rotating the changeover switch 7d in the circumferential direction, the circumferential projection 4d and the circumferential projection 7e are aligned, and can be switched to the above-described direct push setting or indirect push setting by a knock operation. The configuration is different from the first embodiment shown in FIGS. 1 to 10, and the other configurations are the same as those of the first embodiment shown in FIGS.

  According to a preferred example of this shaft cylinder switch 7d, as shown in FIGS. 15 and 19, the tail plug portion 10a is positioned within a predetermined angular range in the circumferential direction with respect to the rear end opening of the shaft cylinder 10 (rear shaft 10d). The tail plug is inserted through the slide portion 2a of the intermediate piece 2 formed on the inner peripheral surface of the tail plug portion 10a and the rotation restricting portion 1b fitted thereto. The portion 10a and the knock body 1 are integrated in the circumferential direction, the knock body 1 is formed in a bottomed cylindrical shape, and a circumferential protrusion 7e is partially projected in the circumferential direction on the bottom surface at the rear end.

  Then, by rotating the tail plug portion 10a, which is the shaft switch 7d, to either one of the circumferential directions as shown in FIG. 15A, the circumferential projection 7e and the circumferential projection 4d of the shaft body 4 12 (a) and 13, when the knock body 1 is pressed when it is displaced adjacently in the circumferential direction, as shown in FIG. 20 (a), the circumferential protrusion 7b and the circumferential The protrusions 4d are fitted together and rub against each other in the axial direction, so that the cam inclined surface 1a of the knock body 1 is brought into contact with the engaging portion 3a of the rotor 3 and is directly pushed to advance and set to advance.

  Further, by rotating the tail plug portion 10a, which is the shaft switch 7d, in the reverse direction as shown in FIG. 15B, the positional relationship between the circumferential projection 7e and the circumferential projection 4d of the shaft body 4 is obtained. As shown in FIGS. 12B and 13, when the knocking operation is performed when they overlap in the circumferential direction, as shown in FIG. 20B, as shown in FIG. The knock body 1 is indirectly pushed so that the rotor 3 moves forward while securing the gap S between the cam slope 1a and the rear cam slope 3b of the rotor 3.

  As another preferred example, a portion other than the tail plug portion 10a is provided so as to be rotatable in a predetermined angular range in the circumferential direction with respect to the shaft tube 10, and is rotated so that the knock body 1 is rotated in the predetermined angular region. The rotor 3 is pushed directly by the cam slope 1a, and the knock body 1 is indirectly connected to the shaft body 4 while maintaining the clearance S between the cam slope 1a of the knock body 1 and the rotor 3 in the other angle region. Alternatively, the rotor 3 may be pushed.

  Accordingly, the second embodiment shown in FIGS. 11 to 20 also has the operational effects as shown in FIGS. 10 (a-1) to 10 (b-3) as in the first embodiment.

In the illustrated example, the knock-type writing instrument A of the present invention is a knock-type ballpoint pen. However, the present invention is not limited to this, and if the writing body 8 can appear and disappear from the front end 10b of the shaft tube 10 by a knock operation, For example, a mechanical pencil or a sign pen may be used.
Further, the shaft cylinder 10 is configured by screwing and joining the front shaft 10c and the rear shaft 10d. However, the present invention is not limited to this, and the shaft tube 10 may have an integral structure that cannot be separated.

It is a reduction | restoration half cross section which shows Example 1 of the knock type writing instrument of this invention. FIG. 2 is an enlarged end view taken along line (2)-(2) in FIG. 1, where (a) shows direct push setting (when knocking sound), and (b) shows indirect push setting (when silent). ing. FIG. 3 is an enlarged end view taken along line (3)-(3) in FIG. 1. FIG. 2 is an enlarged end view taken along line (4)-(4) in FIG. 1. FIG. 5 is a partial enlarged end view taken along line (5)-(5) in FIG. 1. FIG. 2 is a partial enlarged end view taken along line (6)-(6) in FIG. 1. FIG. 7 is a partial enlarged end view taken along line (7)-(7) in FIG. 1. It is a half sectional view which decomposes | disassembles and shows an internal structure. It is an expansion half sectional view which shows an operation state, (a) shows direct pushing setting (at the time of a knocking sound), and (b) shows indirect pushing setting (at the time of silence). It is an expanded view which shows an operation state, (a-1)-(a-3) shows a direct pushing setting (at the time of a knocking sound), (b-1)-(b-3) shows an indirect pushing setting ( Silent sound). It is a shrinking | reduction half sectional view which shows Example 2 of the knock type writing instrument of this invention. FIG. 12 is an enlarged end view taken along line (12)-(12) in FIG. 11, where (a) shows direct push setting (when knocking sound), and (b) shows indirect push setting (when silent). ing. FIG. 12 is an enlarged end view taken along line (13)-(13) in FIG. 11. FIG. 12 is an enlarged end view taken along line (14)-(14) in FIG. 11. FIG. 12 is an enlarged end view taken along line (15)-(15) in FIG. 11, (a) showing direct push setting (during knocking sound), and (b) showing indirect pushing setting (during silent). ing. FIG. 12 is a partial enlarged end view taken along line (16)-(16) in FIG. 11. FIG. 12 is a partial enlarged end view taken along line (17)-(17) in FIG. 11. FIG. 12 is a partial enlarged end view taken along line (18)-(18) in FIG. 11. It is a half sectional view which decomposes | disassembles and shows an internal structure. It is an expansion half sectional view which shows an operation state, (a) shows direct pushing setting (at the time of a knocking sound), and (b) shows indirect pushing setting (at the time of silence).

Explanation of symbols

A Knock-type writing instrument S Clearance 1 Knock body 1a Cam slope 2 Middle piece 3 Rotor 4 Shaft body 7 Switching means 7a Knock change switch 7d Shaft cylinder switch 10 Shaft cylinder

Claims (2)

By pushing the knocking body (1), the rotor (3) is advanced in the axial direction along the middle piece (2) and then rotated in the circumferential direction to be locked. In the knock type writing instrument that releases the rotor and retracts the rotor (3) in the axial direction along the middle piece (2),
A shaft tube (10);
A shaft body (4) that is reciprocally movable in the axial direction in conjunction with the rotor (3) with respect to the shaft cylinder (10) and is not rotatable in the circumferential direction ;
The shaft cylinder (10) is provided so as not to rotate in the circumferential direction and not to move in the axial direction, and comes into contact with the rotor (3) when moving forward to rotate the rotor (3). includes a make fixed cam slope (6a), a
A knock changeover switch (7a) that is rotatable in the circumferential direction with respect to the knock body (1) is provided, and a circumferential protrusion (7b) that partially protrudes forward in the circumferential direction is provided on the knock changeover switch (7a). And the rear end surface of the shaft body (4) is adjacent to the circumferential protrusion (7b) in the circumferential direction in a predetermined angle region, and is contacted by the circumferential protrusion (7b) in other angle regions. A circumferential protrusion (4d) is provided,
When the knock changeover switch (7a) is rotated to reach the predetermined angle region, the cam slope (1a) of the knock body (1) is brought into direct contact with the rotor (3) and the rotor ( 3) is pushed, and this rotor (3) is rotated in contact with the cam slope (2b) of the middle piece (2),
When the angle region is other than that, the circumferential protrusion (7b) of the knock changeover switch (7a) is brought into contact with the circumferential protrusion (4d) of the shaft body (4), thereby the shaft body (4). To move the rotor (3) forward in conjunction with the shaft body (4), so that a gap (between the cam slope (1a) of the knock body (1) and the rotor (3) ( A knock-type writing instrument characterized in that the rotor (3) moved forward is brought into contact with the fixed cam slope (6a) and rotated while maintaining the clearance (S) while maintaining S) . By pushing the knocking body (1), the rotor (3) is advanced in the axial direction along the middle piece (2) and then rotated in the circumferential direction to be locked. In the knock type writing instrument that releases the rotor and retracts the rotor (3) in the axial direction along the middle piece (2),
A shaft tube (10);
A shaft body (4) that is reciprocally movable in the axial direction in conjunction with the rotor (3) with respect to the shaft cylinder (10) and is not rotatable in the circumferential direction;
The shaft cylinder (10) is provided so as not to rotate in the circumferential direction and not to move in the axial direction, and comes into contact with the rotor (3) when moving forward to rotate the rotor (3). A fixed cam slope (6a)
A part of the shaft cylinder (10) is provided with a shaft cylinder switch (7d) that is rotatable in the circumferential direction with respect to the other part, and the shaft cylinder switch (7d) is integrally rotated with the shaft cylinder switch (7d). A knock body (1) is provided, the knock body (1) is provided with a circumferential protrusion (7e) that partially projects forward in the circumferential direction, and a predetermined angle is formed on the rear end surface of the shaft body (4). A circumferential protrusion (4d) that is adjacent to the circumferential protrusion (7e) in the circumferential direction in the region and is abutted by the circumferential protrusion (7e) in the other angular regions,
When the shaft changeover switch (7d) is rotated to reach the predetermined angle region, the cam slope (1a) of the knock body (1) is brought into direct contact with the rotor (3) and rotated. The child (3) is pushed, and the rotor (3) is rotated in contact with the cam slope (2b) of the middle piece (2),
When the angle region is other than that, the circumferential protrusion (7e) of the knock body (1) is brought into contact with the circumferential protrusion (4d) of the shaft body (4) to thereby disengage the shaft body (4). By pushing and advancing the rotor (3) in conjunction with the shaft (4), a gap (S) is formed between the cam slope (1a) of the knock body (1) and the rotor (3). ) And maintaining the gap (S) while rotating the advancing rotor (3) in contact with the fixed cam slope (6a).

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