JP5262088B2 - Writing instrument - Google Patents

Description

  The present invention relates to a writing instrument in which a knock member is disposed on a side surface of a shaft tube.

As an example, there is JP-A-2006-76274, and the scope of the claims includes: “A shaft is divided into front and rear at the rear part of the grip position, and a center shaft sharing a shaft and a center line is provided in the shaft. With a transmission pin hole that can be slidably placed between them, a cylindrical part that shares the shaft and center line is used as the transmitter, and the rear part is in contact with the transmitter via an adjustment washer. Cylindrical part arranged in the same way, and when not knocked, it has a cylindrical part with the same outer diameter as the shaft outer diameter at the rear part that is slightly longer than the stroke of the chin chuck and is the same as the shaft outer diameter. A frustum with a bottom surface of the outer diameter and a truncated cone having the same outer diameter as the outer diameter of the central shaft is integrated with the cylindrical part so that the bottom surface is joined. The placed part is the follower, and when not knocked, it shares the axis with the center line. The front end of a cylindrical part with a length suitable for the handle is placed in contact with the side of the follower's truncated cone to make a knock button, and the knock button is placed on the side of the truncated cone that has the same shape as the follower and is reversed front and back. The cylindrical part with the same outer diameter as the outer diameter of the frustoconical part and the shaft is fixed to the middle shaft by interference fit, and the cylindrical part with the same outer diameter as the shaft inner diameter is fixed between the rear shaft and the middle shaft. The stator is fixed with a tight fit in between, and a slit that allows the transmission pin to slide when the transmission pin is inserted into the transmission pin hole is opened in the middle shaft in a length that does not interfere with the stroke of the chuck. A cylindrical part sharing a shaft and center line with a transmission pin hole and a part with a frustoconical space are integrated into the center part, and a slidable, loosely-fitted component is placed in the middle shaft. Side having a knock mechanism that is connected to the transmitter with a transmission pin as a transmitter and constitutes a knock mechanism Locking type Sha - Pupenshiru "has been described as.
In other words, a knocking operation for extending the writing body from the entire circumference of the shaft cylinder toward the axial direction is possible, and it is possible to knock without changing the axis without worrying about the direction of the knock button on the side of the shaft. Is disclosed.
JP 2006-76274 A

However, in the above prior art, the knock member has two sliding surfaces at the front and rear, and is separately pressed at the front and rear of the knock member, so it is difficult to balance the pressing. Each time it was pressed, it gave a feeling of knocking twice. Further, depending on the position where the knock button is pressed, there is a problem in that the knock member wobbles during knocking, causing a feeling of strangeness in the knocking operation, or hindering the feeding of the cursive.
In addition, when the writing pressure is applied to the cursive body, if the finger is lightly touching the knocked portion, there is a problem that the cursive body is immersed even with a slight force. In particular, in a writing instrument having a knock portion in any direction on the circumference as in the prior art, there is a very high possibility that the finger touches the knock portion, and this problem is remarkable.

  The present invention solves the above-described problems, and even in a writing instrument capable of knocking operation for feeding out the writing body from the entire circumference of the shaft cylinder toward the axial direction, it is ensured without being aware of instability due to the knocking operation. It is another object of the present invention to provide a writing instrument that can draw out a cursive body and further prevents the cursive body from being immersed due to a finger touching the knock portion.

The invention according to claim 1 is a writing instrument in which a knock member is arranged on a side surface of the shaft cylinder, and is provided so as to surround the knock member over the entire circumference of the shaft cylinder. A frame that moves forward and backward by an operation is engaged with the knock member, and has a transmission portion that includes at least one member for transmitting the operation of the knock member to the writing body, and the operation of the knock member is performed on the writing body. At least one gap is provided between the transmission abutting portions that abut for transmission, and the knock member is disposed so as to be swingable with respect to the shaft cylinder with the front or rear portion of the knock member as a fulcrum. The other end of the knock member is engaged with the frame base, and the fulcrum is provided at a position on the opposite side of the axis of the shaft cylinder with respect to the pressing side of the surrounding portion of the knock member . It is characterized by that.

  A second aspect of the invention is the writing instrument according to the first aspect, wherein at least one member of the transmission portion is urged rearward by a resilient member.

The invention according to claim 3 is a writing instrument in which a knock member is disposed on a side surface of the shaft cylinder, and is provided so as to surround the knock member over the entire circumference of the shaft cylinder. The knock member has a front or rear portion as a fulcrum, and is disposed so as to be swingable with respect to the shaft tube, and the other end of the knock member is engaged with a frame base that moves back and forth by operation of the knock member. The fulcrum is provided at a position opposite to the pressing side of the surrounding portion of the knock member with respect to the axis of the shaft tube .

  The invention according to claim 4 is the writing instrument according to any one of claims 1 to 3, wherein an elastic body is interposed between the knock member and the shaft tube at the fulcrum.

  Invention of Claim 5 is the writing instrument in any one of Claims 1-4, Comprising: It has a clip and a rod-shaped body feeding apparatus, The rotation of the said clip and feeding of a rod-shaped body were made to interlock | cooperate. And

  Invention of Claim 6 is a writing instrument in any one of Claims 1-5, Comprising: The diameter of the axial cylinder of the front end vicinity of the said knock member and / or the rear end vicinity is made into the maximum outer diameter of the said knock member. It is characterized by being larger than.

  In addition, before in this specification refers to the direction where a writing body is drawn | fed out with respect to a writing instrument longitudinal direction, and back refers to the reverse direction.

  According to the first aspect of the present invention, even in a writing instrument capable of knocking operation for feeding out a writing body in the axial direction from the entire circumference of the shaft cylinder, the writing is surely performed without being aware of instability due to the knocking operation. The body can be extended, and the curving of the cursive body due to the finger touching the knocked portion is prevented. Further, since the knock member can swing, it is possible to knock even if the knock direction is not perpendicular to the axis of the shaft tube. Therefore, it is possible not only to obtain a good knocking operation feeling by obtaining different knocking operations, but also to surely carry out the cursive even when the knocking direction is slightly shifted. By defining the position of the fulcrum when the knock member swings, the shaft cylinder does not become thick or the knock does not become heavy, and the knock stroke can be increased.

  According to the second aspect of the present invention, even when the knock member is touched with a stronger force, it is possible to prevent the cursive object from being immersed.

  According to the third aspect of the present invention, even in a writing instrument capable of knocking operation for feeding out the writing body from the entire circumference of the shaft tube toward the axial direction, writing can be performed without being conscious of instability due to the knocking operation. The body can be extended, and further, by defining the position of the fulcrum when the knock member swings, the knock cylinder does not become thick or the knock does not become heavy, and the knock stroke can be increased. .

  According to the invention of claim 4, a smooth knocking feeling can be obtained by the elastic body.

  According to the fifth aspect of the present invention, even when the rear rod-like object is protruded by the rotation of the clip, the knock operation for extending the core from the entire circumference of the shaft tube toward the axial direction is possible. Even if the rod-like object is kept in the protruding state regardless of the position, it is possible to prevent the knocking operation from being hindered.

  According to the sixth aspect of the present invention, it is possible to make it difficult to touch the knock member with a finger during writing, and it is possible to more reliably prevent the core from being immersed.

  One form of this invention is demonstrated based on FIGS. The shaft cylinder 1a is composed of a rear shaft 1, a front shaft 2, and a middle shaft 11, and a grip made of a cylindrical rubber-like elastic body on the outer peripheral portion of the front shaft 2, that is, a portion gripped in writing. 3 is provided and fitted over the entire circumference, but liquid rubber or urethane resin is partially applied and solidified, or hemispherical resin spheres are bonded and fixed to the surface of the front shaft 2. Alternatively, fine knurled irregularities may be formed on the outer periphery of the front shaft 2 and the front shaft 2 itself may be used as the grip 3.

  Inside the front shaft 2, a pressing slider 5 for moving the chuck body 4 and the like back and forth is provided, and a step 5a is provided on the outer periphery. At the rear of the pressing slider 5, there are integrally formed rod-shaped pressing transmitters 6 composed of one or more (in this example, two installed at opposite positions). It may be configured. The press transmission element 6 slidably penetrates a through hole 7 formed in the intermediate partition wall 2 a of the front shaft 2 and can move back and forth with respect to the front shaft 2.

The middle shaft 11 that connects the rear shaft 1 and the front shaft 2 includes a knock member 8 that extends on the circumference around the axis, and the knock member 8 is located behind the partition wall 2a. It arrange | positions in the state surrounding the extended center axis | shaft 11. As shown in FIG. The inner peripheral diameter of the knock member 8 is expanded toward the front end. An elastic ring 10 made of an elastic body is fitted in a ring shape between the shaft cylinder 1 a and the knock member 8 on the upper side of the small diameter portion 9 corresponding to the minimum diameter portion of the inner peripheral diameter. On the other hand, the inner diameter portion of the knock member 8 is conically expanded from the small diameter portion 9 toward the front, and is a large diameter portion 12 having a maximum inner diameter at the front end portion of the knock member 8. When the knock member 8 is operated, when the elastic ring 10 is arranged, a contact point between any one point on the periphery of the rear end of the knock member and the elastic ring 10 provided on the shaft cylinder serves as a fulcrum. The fulcrum of the knock member may be provided on the circumference of the front end of the knock member. Further, the front end portion is engaged with the frame base 13 both when knocking and when not knocking. For this reason, even if knocking from any direction, the knocking member can be knocked without coming off. At this time, the contact portion between the knock member 8 and the piece base 13 when not knocked is referred to as a contact portion 13b. The elastic ring 10 is not essential, but it is preferable to provide the elastic ring 10 in consideration of the frictional strength between the knock member 8 and the front shaft 2 and the knock member 8 during operation. The elastic ring 10 may be integrated with the knock member 8 or may be a separate body. By providing the elastic ring 10, a smooth knocking feeling can be obtained.
Strictly speaking, since the elastic ring 10 is deformed, the contact point with the knock member becomes a surface, but in this specification, the position of the fulcrum is defined based on the swing of the knock member 8. Therefore, the fulcrum may not be on the member. Further, in this example in which the elastic ring 10 is not disposed, a contact point between any one point on the rear end periphery of the knock member and the shaft cylinder serves as a fulcrum at the time of knocking. Even in the case of surface contact, the swing of the knock member 8 is also used as a reference.

  In front of the knock member 8, there is disposed a frame base 13 in which an inclined conical surface 13a that engages with the large diameter portion 12 of the knock member 8 is formed over the entire circumference. A through hole 14 that can slide back and forth with respect to the middle shaft 11 of the shaft 2 is formed. That is, the frame base 13 is disposed in a state of surrounding the central shaft 11 and the frame base 13 moves forward by pushing the front of the knock member 8 in the axial direction. The movement of the top 13 is transmitted to the pressing transmitter 6 of the pressing slider 5, whereby the pressing slider 5 also moves forward. At this time, the large-diameter portion 12 of the knock member 8 and the conical surface 13a of the frame 13 generate sliding resistance due to friction, but the large-diameter portion 12 has a curved shape in order to reduce the sliding resistance. Yes. Since the knocking operation for feeding out the writing body from the entire circumference of the shaft cylinder toward the axial direction is possible, the curved surface shape is formed over the entire circumference of the large diameter portion 12. Note that the frame base 13 does not necessarily need to surround the center shaft 11 over the entire circumference of the shaft tube, and may be any device that can transmit the operation of the knock member, such as three or four.

A core cylinder 18 that can move back and forth with respect to the shaft cylinder is disposed inside the axis cylinder, and a receiving plate 19 is fixed in front of the core cylinder 18. The core cylinder 18 passes through the pressing slider 5, and the rear end portion of the receiving plate 19 is in contact with the front end portion of the pressing slider 5. In front of the receiving plate 19, a two-piece or three-piece chuck body 4 fitted with a chuck ring 20 is fixed. The chuck body 4 grips and releases the lead, and the chuck ring 20 opens and closes the chuck body 4. The operation of the chuck body 4 is the same as that of the prior art. When the chuck body 4 is pressed from the rear by the pressing slider 5, the chuck body 4 holding the core advances and the core is fed out. Expand and open the wick. When the pressing operation is released here, the chuck body 4 retreats and returns with the lead open, but eventually grips the lead again. The core cylinder 18 stores at least two cores.
In this specification, the mechanical pencil unit in which the core cylinder 18, the receiving plate 19, the chuck ring 20, the chuck body 4, and the core built in the core cylinder 18 are combined is referred to as a writing body. In addition, when used for a ballpoint pen or the like, the ballpoint pen refill is referred to as cursive.

  In addition, a fastening cylinder 21 is connected and fixed to the front of the front shaft 2 in a non-detachable manner by a concave-convex fitting at a connecting portion 22. A front end 23 is detachably fixed to the front of the clamping tube 21 by means such as screwing. The fastening cylinder 21 may be formed integrally with the front shaft 2. A core detent member 24 made of a rubber-like elastic body is press-fitted and fixed inside the tip 23. Reference numeral 25 denotes a resilient member such as a coil spring that urges the chuck body 4 and the core tube 18 toward the rear. The rear shaft 1 and the front shaft 2 are connected by fitting a middle shaft 11 extending from the partition wall 2a of the front shaft 2 toward the rear portion into a through hole 26 formed inside the rear shaft 1. However, it is connected and fixed so as not to be detachable by being concavo-convexly fitted at the connecting portion 27 of the rear shaft 1 and the front shaft 2.

Here, the effect of preventing the core immersion when the writing pressure is applied to the core will be described. When the pen pressure is applied to the lead, the friction force caused by the lead detent member and the increase in the gripping force obtained by the chuck body retracting and the chuck body being tightened by the chuck ring are more robust. Has the effect of preventing core immersion. If the chuck cannot be retracted, the core gripping force cannot be increased, and the core is easily immersed during writing. Further, the above-described chuck retraction action is hindered even if the finger is lightly touching the knock portion. Therefore, in this example, a gap 8 a is provided between the piece base 13 and the press transmitter 6. Due to the presence of the gap 8a, the chuck retraction action is not hindered even if the finger is lightly touching the knock portion. In the writing instrument in which the knock portion exists in any direction on the circumference as in the present invention, the possibility that the finger touches the knock portion is very high. For this reason, it is a very effective means to prevent a factor that hinders the backward movement of the chuck.
Note that the gap 8a is not limited to this position, and it is sufficient that at least one of the transmission abutting portions 8d abutting to transmit the operation of the knock member 8 to the writing body has a gap. . In other words, it suffices if it is between at least one member between the members that transmit the front-rear movement of the frame base between the front end of the knock member 8 and the transmitted portion 8 b of the chuck body 4. In this example, the knock stage 13 moves forward by the operation of the knock member at the time of knocking, and the forward movement is transmitted to the pressure transmitter 6 disposed in front of the bridge table 13 and further disposed in front of the pressure transmitter 6. It is transmitted to the chucked body 4 through the transmitted portion 8b. Therefore, the three members of the top 13, the press transmitter 6, and the press slider 5 are collectively referred to as a transmission portion 8 c, and the portion that contacts the operation of the knock member 8 to transmit to the writing body is the transmission contact portion. Indicated as 8d. That is, as shown in FIG. 2, the gap 8 a is formed between the knock member 8 and the piece base 13, between the piece base 13 and the press transmitter 6, between the press transmitter 6 and the press slider 5, and the press slider 5. And at least one of the parts to be transmitted 8b of the chuck body 4 may be provided. In addition, when the gap 8a is provided between the knock member 8 and the piece base 13, the knock member 8 is locked so as to be movable back and forth. A gap is formed between the rear end of the member 8 and the rear shaft 1. The transmission portion 8c may be formed from a plurality of members or a single member.

  In addition, a soft member 28 made of a rubber-like elastic body or the like is fitted on the outer periphery of the knock member 8, but like the grip 3, liquid rubber or urethane resin is partially applied. It may be solidified or hemispherical resin spheres may be bonded and fixed to the surface of the knock member 8, or unevenness may be formed on the outer periphery of the knock member 8 to obtain a non-slip effect by the knock member 8 itself. good. Further, the outer shape of the knock member 8 has a bell shape, but is not particularly limited as long as it does not hinder the operation with a finger or the like. A knurled shape may be applied.

  In addition, when the soft member 28 made of the rubber-like elastic body is fitted, or the knock member 8 having fine knurled irregularities formed on the outer periphery, the grip force is improved when operating with the fingertip or the abdomen of the finger. The knock member 8 can be easily operated at any location on the circumference. Moreover, when it forms with a rubber-like elastic body, the burden concerning a shaft main body by the press in a fingertip or a finger | toe abdomen will become light. An eraser 29 and a cap 30 are detachably attached to the rear portion of the rear shaft 1 so as to cover the eraser 29. Although the clip 31 is integrally formed on the side surface of the cap 30, it may be integrally formed behind the rear shaft 1.

Here, another modification is shown based on FIGS. In this example, as shown in FIG. 5, the member provided so as to be surrounded by the middle shaft 11 such as the knock member 8 is divided into two and fixed by the fixing portion 8e. 1-3, it is necessary to insert the member provided so as to surround the middle shaft 11 before the rear shaft 1 is engaged with the front shaft 2 during assembly. However, as shown in this example, the knock member 8 and the like are divided into two parts and fixed to the middle shaft 11 later, thereby increasing the degree of freedom in the work procedure during assembly, and more free design. Can do.
The knock member 8 and the like do not necessarily need to be formed in half, and any member that can be fitted into the middle shaft 11 by forming it in a C shape with a resilient member may be used.

  Next, the operation will be described with reference to FIG. FIG. 6 shows a state in which the mechanical pencil unit such as the chuck body 4 is advanced by pushing the knock member 8 from one of the circumferences against the axis of the shaft cylinder, and the lead is extended. When the knock member 8 is pushed in the center direction with respect to the axis of the shaft main body from the state shown in FIG. The knock member 8 swings using the elastic ring 10 as a fulcrum. At this time, the contact peripheral edge portion of the large-diameter portion 12 of the knock member 8 rubs up the conical surface 13 a of the frame 13 and approaches the center shaft 11. In combination with the movement of the knock member 8, the piece base 13 penetrates and is guided through the middle shaft 11 of the front shaft 2 so as to slide back and forth. At this time, the pressure transmitting element 6 of the pressing slider 5 is also penetrated and guided so as to be slidable back and forth with respect to the front shaft 2, and therefore advances with respect to the front shaft 2. As the pressing slider 5 moves forward, the core cylinder 18 and the receiving plate 19 fixed to the pressing slider 5 and the chuck body 4 fixed to the receiving plate 19 also move forward. As the chuck body 4 moves forward, the lead moves forward and is fed out, but eventually the chuck body 4 expands and the lead is released. At this time, the elastic member 25 is compressed as the receiving plate 19 advances.

Here, when the pressing operation of the knock member 8 is released, the restoring force of the resilient member 25 moves the piece base 13 backward, and the contact peripheral edge of the large diameter portion 12 is guided by the slope of the piece base 13. And return to the original state. Coupled with these movements and return operations, the top 13, the resilient member 25, the receiving plate 19, the chuck body 4, the chuck ring 20, and the pressing slider 5 are returned to their original positions. At this time, the core is again gripped by the chuck body 4. When it is desired to immerse the core, the chuck body 4 is released by pressing the knock member 8, and the core that becomes the writing body in this state is pressed against the paper surface.
In this example, the restricting portion of the pressing slider 5 is the abutting portion between the front end of the frame base 13 and the rear end of the partition wall 2a. You may form so that it may become a contact part etc. of the step 5a of the moving element 5, and the front shaft inner surface.

Further, based on FIG. 7, an example in which a fulcrum at the time of swinging is provided at the front end of the knock member 8 is shown. The inner diameter portion of the knock member 8 is expanded in a conical shape from the small diameter portion 9 toward the rear, and is a large diameter portion 12 having a maximum inner diameter at the rear end portion of the knock member 8. Below the knock member 8, a conical portion 13 c formed with an inclined conical surface 13 a that engages with the large diameter portion 12 is formed on the rear shaft 1. The knock member 8 moves downward on the inclined conical surface 13a engaged with the large diameter portion 12 by being pushed in the axial direction. By the downward movement of the knock member 8, the operation is transmitted to the frame base 13 forming the through hole 14 that can slide up and down with respect to the center shaft 11, and the pressure transmitter 6 of the pressure slider 5 that is in contact therewith. Thus, the pressing slider 5 also moves downward. At this time, the large-diameter portion 12 and the conical surface 13a generate sliding resistance due to friction, but the large-diameter portion 12 has a curved shape in order to reduce the sliding resistance. Of course, since the knock member 8 can be operated from any direction, the curved surface shape is formed over the entire circumference of the large-diameter portion 12.
By forming in this way, the knock member 8 swings with any one point of the front end as a fulcrum. Therefore, a substantially knockable portion of the knock member can be formed as far as possible at the time of writing, and the chances of accidentally pressing the knock portion can be reduced. In addition, this makes it possible to design a wider design such that the knock member 8 is disposed forward. That is, it is possible to provide a fulcrum at either the front part or the rear part of the knock member 8.

  Next, Example 1 will be described with reference to FIGS. In this example, the strength of the shaft body at the time of operation of the knock member 8 is taken into consideration. In this example, the operation direction of the knock member is performed perpendicularly to the shaft main body, and a large load is applied to the root portion 15 of the middle shaft 11 during operation. Therefore, in this example, a plurality of vertical ribs 16 are formed in the root portion 15 of the front shaft 2, and vertical grooves 17 that do not interfere with the vertical ribs 16 are formed in the frame base 13. As a result, the burden on the root portion 15 during operation can be reduced. In this example, the vertical ribs 16 and the vertical grooves 17 are provided at four radial positions. However, the present invention is not limited to this, and the number may be three or six. May be.

  Next, Example 2 will be described with reference to FIGS. In this example, a rotation stop is formed so that the knock member 8 does not rotate during operation with the fingertip. The operation direction of the knock member 8 in this example is performed perpendicular to the axis, and the knock member 8 does not rotate unless a force is accidentally applied in the circumferential direction. However, in this example, two or more (four in this example) pin-shaped corners 32 are formed at the upper end of the knock member 8 so as not to rotate even if erroneous, and the corners 32 are not interfered with. A square groove 33 is formed on the end surface of the rear shaft 1. The apex of the corner 32 has a semicircular arc shape, which facilitates insertion into the square groove 33. Further, the corner portion 32 is inclined during operation, and there is a risk that interference with the rear shaft 1 may also occur. Therefore, in the present example, a gap 34 that can correspond to the inclination is provided between the square groove 33 and the corner portion 32.

  Next, Example 3 is demonstrated based on FIGS. The shaft cylinder 1a is composed of a rear shaft 1, a front shaft 2, and a middle shaft 11. Inside the front shaft 2, a pressing slider 5 for moving the chuck body 4 and the like back and forth is provided. Behind the pressing slider 5, a bar-shaped pressing transmitter 6 comprising one or more (in this example, two installed at opposing positions) is disposed. Further, an elastic member 25 is arranged in front of the pressing slider 5. A resilient member 39 is disposed outside the middle shaft 11, and two longitudinal grooves 48 are formed in the longitudinal direction. In addition, a triangular notch 50 is formed at the rear end of the middle shaft 11, and an anti-rotation portion 51 is formed at the front end. A circumferential projection is formed behind the front end, and the circumferential projection forms the front. The shaft 2 is press-fitted and fixed. A flat portion is formed on the front shaft 2 so as to receive the anti-rotation portion 51. The pressing slider 5 is also formed with a flat portion 53, which is intended to be inserted into the front shaft 2. Further, the flat portion 53 is formed with a notch 54, which is positioned during assembly.

  The pressure transmitter 6 is immersed in the vertical groove 48, and the piece base 13 is disposed behind the vertical transmission groove 6. Two protrusions 49 extending in the longitudinal direction are formed on the inner peripheral surface of the piece base 13, and the protrusions 49 are also immersed in the vertical grooves 48. When knocking, the projection 49 presses the pressure transmitter 6 forward. A knock member 8 is disposed behind the piece base 13, and a relay member 47 is press-fitted into the middle shaft 11 behind the knock member 8. The rear shaft 1 is detachably fitted behind the intermediate member 47. Further, two projecting portions 55 extending in the longitudinal direction are formed on the inner peripheral surface of the intermediate member 47, and the rotation of the shaft connecting tube portion 52 is prevented by immersing in the longitudinal groove 48. . Further, the above-described notch 50 serves as a guide for the projection 55 during assembly, and is easy to assemble.

  As described above, by immersing the press transmitter 6 in the longitudinal groove 48 formed in the middle shaft 11, the shaft tube can be formed thin without reducing the strength of the writing instrument itself. Further, the protrusion 49 and the protrusion 55 are also immersed in the vertical groove 48, so that the shaft tube can be formed thin without reducing the strength of the writing instrument itself as described above.

  Next, the knocking operation will be described. The knock member 8 is arranged in a state of surrounding the intermediate member 47. When the knock member 8 is operated, a contact point 56 between any one point on the periphery of the rear end of the knock member and the surrounding portion of the knock member (the intermediate member 47 or the middle shaft 11) serves as a fulcrum when the knock member swings. .

Moreover, in the writing instrument in which the knock part exists in any direction on the circumference as in this example, in order to prevent the core from immersing when the finger touches the knock part, the front or rear of the press transmitter 6 is used. However, since an extra knock stroke is required for the gap, it is useful to increase the knock stroke as much as possible.
Normally, the knock stroke can also be increased by increasing the inclination angle of the conical surface 13a formed on the piece base 13. However, there is a problem that the knock becomes heavy in that case. Further, when the knock stroke is increased without changing the inclination angle of the conical surface 13a, the knock portion must be formed thick.

  Therefore, in this embodiment, the fulcrum at the time of swinging on the rear end periphery of the knock member is provided at one point on the opposite side of the axis with respect to the knock direction toward the axis of the knock member. In order to set the fulcrum in such a position, in this example, the front end of the surrounding portion of the knock member 8 is slightly inclined inward. By doing so, the pressing side of the surrounding portion of the knock member 8 slides forward, and the surrounding portion (contact point 56) on the opposite side serves as a fulcrum when the knock member 8 swings. In other words, the rear end portion of the knock member 8 is a fulcrum at a position rotated along the circumference of 180 ° from the pressing side during knocking. By providing the fulcrum in this way, the contact point of the knock member 8 with the piece base 13 comes out forward. This is because when considering circular motion, the movement in the forward direction when viewed near the side of the circle is greater than the movement in the forward direction when viewed near the front end of the circle. Therefore, a large knock stroke can be obtained even if the knock is light and the knock portion is formed thin.

Here, the elastic member 39 made of a coil spring or the like will be described in detail. As described above, in this example, the resilient member 39 is disposed outside the middle shaft 11 and in front of the stand 13 and biases the stand 13 backward. The member to be bulleted by the bullet member 39 is not limited to the piece base 13, but at least one member for transmitting the back and forth movement of the piece base between the chuck bodies is knocked by the bullet member. It only has to be energized to resist.
The elastic member 39 in this example will be described in more detail. A pressure transmission element 6 is provided on the outside of the elastic member 39, between the piece base 13 and the pressure slider 5, so as to penetrate the through hole 7. In this example, where the pressure transmission element 6 is located. Is not fixed, but may be fixed to the stand 13 or the pressing slider 5 or may be integrally formed. Moreover, in this example, although the press transmitter 6 was comprised with the metal, you may comprise with various resin molded products. Further, a gap 8 a is provided between the front end or the rear end of the press transmitter 6 and the piece base 13 or the press slider 5. That is, when the space portion 46 is provided in the piece base 13 and the pressing slider 5, the length in the longitudinal direction of the space portion 46 is L1, and the length in the longitudinal direction of the pressure transmitting element is L2, L1> L2. It is formed to become. However, L1-L2 is smaller than the knock stroke and has a length that allows the lead to be extended.

  When writing pressure is applied to the core, the core is strengthened by two actions: the frictional force of the core detent member and the increase of the core gripping force that is obtained when the chuck is retracted and the chuck is tightened by the chuck ring. Has a preventive action. If the chuck cannot be retracted, the core gripping force cannot be increased, and the core easily returns during writing. Further, the above-described chuck retraction action is hindered even if the finger is lightly touching the knock portion. Therefore, by providing the gap 8a, if the force applied to the knock portion is less than the force that completely fills the gap 8a, that is, less than the force that the piece base 13 and the press transmitter 6 are in contact with each other. Even if a finger touches the knock part lightly, the chuck retraction action is not hindered. The force until the gap 8a is filled is further increased through the elastic member 39, and is larger than the force when the gap between the fingers contacts the writing instrument in a normal writing operation, so that the core returns during writing. This can be prevented. As long as L1−L2> 0 as described above, the backward movement of the chuck is not inhibited, and when L1−L2 = 0, the backward movement of the chuck is inhibited and the lead is easily returned. Thereafter, by further pushing the knock, the forward movement of the pressing slider 5 is started and the lead is fed out. In the case of the side knock type or the rear end knock type, the finger rarely touches the knock part, but in the writing instrument in which the knock part exists in any direction on the circumference like the present invention, the finger touches the knock part. Very likely. For this reason, it is a very effective means to prevent a factor that hinders the backward movement of the chuck.

Next, Example 4 will be described with reference to FIG. This example is applied to an oil-based or water-based ballpoint pen. This will be specifically described below.
A refill for a writing instrument such as a ballpoint pen, which becomes a writing body, by pushing the knock member 8 from one of the circumferences into the axis of the shaft body to advance the slider 36 or the rotor 37 along the cam groove 38. Invade the tip. A slider 36 is positioned in front of the pressing slider 5, and a rotor 37 is rotatably disposed in front of the slider 36. Cam teeth are formed on the slider 36 and the rotor 37, and the cam teeth are fitted in a cam groove 38 formed on the inner surface of the fastening cylinder 21 so as to be movable back and forth. A debit cam mechanism which is a so-called rotary type retracting mechanism is constructed and arranged.
In this example, the gap 8a is not formed, but a gap may be provided as in other embodiments.

Next, the operation will be described. When the knock member 8 is pushed into the axis of the shaft cylinder from any one of the circumferences, the piece base 13 moves forward and the pressing slider 5 moves forward against the elastic force of the elastic member 25. As the pressing slider 5 advances, the slider 36 and the rotor 37 advance while rotating, and the cam groove 38 is engaged at the advanced position, and the advanced position is maintained. The front end of the rotator 37 and the engaging operation allow the writing tool refill tip to protrude and enable writing. Here, when the knock member 8 is pushed again with respect to the axis of the shaft main body, the rotor 37 rotates again and the engagement with the cam groove 38 is released. At this time, the rotor 37 and the writing instrument refill are moved backward by the elastic force of the elastic member 25 and returned to the state where the writing instrument refill tip is immersed.

Next, Example 5 will be described with reference to FIG. In this example, the diameter R1 of the shaft cylinder in the vicinity of the front end of the knock member 8 is formed larger than the maximum diameter r of the knock member 8. More specifically, a large diameter portion is provided in the shaft cylinder between the grip 3 and the knock member 8. In particular, when writing by holding the back of the grip, there is a high possibility that the thumb, the index finger, and the middle finger will touch the knock member 8, so that the formation of such a configuration provides a further anti-centering effect.
FIG. 17 shows a modification of this embodiment. In this example, the diameter R2 of the shaft tube in the vicinity of the rear end of the knock member 8 is formed larger than the maximum diameter r of the knock member 8. More specifically, a large-diameter portion is provided in the inter-finger contact portion when the writing instrument is gripped. When writing with the writing tool standing up against the paper surface with a strong writing pressure, there is a high possibility that the finger will touch the knock member 8.
18 and 19 show further modifications of the present embodiment. In this example, the diameters R1 and R2 of the shaft cylinders near the front end and the rear end of the knock member 8 are made larger than the maximum diameter r of the knock member. Specifically, as shown in FIG. 18 , the shaft cylinder between the grip 3 and the knock member 8 and the finger contact portion when the writing instrument is gripped are provided with large diameter portions, Thus, it is conceivable that the maximum diameter r of the knock member 8 is made smaller than the diameters R1 and R2 of the shaft cylinders near both ends thereof.
By forming as described above, it is possible to further reduce the possibility that a hand or a finger contacts the knock member 8. Moreover, even if it contacts, since the outer diameter of the axial cylinder of the front and back is larger than the maximum outer diameter of the knock member 8, the contact load to the knock member 8 of a hand or a finger can be reduced. Therefore, in this example, compared with Example 4, it can show the further anti-centering action.

  Next, Example 6 will be described with reference to FIG. In this example, the rear shaft 1 is configured integrally with a rod-shaped body feeding device. The rod-shaped body feeding device will be described in detail below. A spiral groove 41 is formed on the inner wall surface of the rear shaft 1, and a rod-shaped body guide member 42 is rotatably disposed inside the rear shaft 1. In the longitudinal direction of the rod-shaped body guide member 42, slits are formed at positions facing each other. A rod-shaped body receiving member 43 is arranged on the inner surface of the rod-shaped body guiding member 42 so as to be able to move back and forth. However, a protrusion 44 is formed on the side surface of the rod-shaped body receiving member 43 at a position facing it. Are screwed into the spiral groove 41 through the slit. That is, when the rear shaft 1 and the rod-shaped body guide member 42 are relatively rotated, the rod-shaped body receiving member 43 moves back and forth, and the eraser 29 attached to the rod-shaped body receiving member 43 also moves back and forth along with the back and forth movement. Then, the eraser 29 appears and disappears from the flange portion 45 formed at the rear end of the rod-shaped body guide member 42. Further, a relay member 47 is press-fitted and fixed to the rear of the front shaft 2, and the relay member 47 is detachably attached to the rear shaft so that the core can be easily replenished.

  In this example, the clip 31 is fixed to the flange 45. With this configuration, the eraser 29 can be fed out by rotating the clip, and the eraser can be fed out with one hand. Further, the rod-like body feeding device may be configured such that the rod 31 is fed by relative rotation of the rear shaft 1 and the front shaft 2 and the clip 31 is fixed to the rear shaft 1. That is, it is sufficient if the rotation of the clip and the feeding operation are linked.

  Originally, if the clip rotation and the bar-shaped body feeding were linked as described above, it was necessary to change the clip so that it would not get in the way every time the eraser was fed, or to turn the clip again. By adopting a configuration that allows knocking over the entire circumference as described above, writing can be continued with a minimum knocking operation without rotating the clip.

Example 7 will be described with reference to FIG. In this example, an elastic body 57 is arranged in the gap 8a in the third embodiment. Similar to the third embodiment described above, the gap 8a is not limited to this position, and may be between the transmission contact portions 8d that contact the operation of the knock member 8 to transmit to the writing body. At that time, when the gap 8a is provided between the knock member 8 and the piece base 13, the knock member 8 is locked so as to be movable back and forth, so when the writing instrument front is directed downward, A gap is formed between the rear end of the knock member 8 and the rear shaft 1.
Even when the gap 8a is filled with the elastic body 57 as in the present example, the slight movement of the knocking member 8 can be absorbed by the elastic body 57, so that the core can be prevented from being immersed similarly to the third embodiment. it can. Examples of the elastic body 57 include a coil spring, a sponge, and rubber. Moreover, you may form members, such as the elastic body 57 and the press transmission element 6, by one member. By doing so, even if the resilient member 39 made of a coil spring for urging the piece base 13 is eliminated, rattling of the knock member can be eliminated and the number of parts can be reduced. Of course, the elastic body 57 is located between the knock member 8 and the frame base 13, between the frame base 13 and the press transmitter 6, between the press transmitter 6 and the press slider 5, and depending on the position where the gap is provided. 5 and the transmitted portion 8 b of the chuck body 4 and between the rear end of the knock member 8 and the rear shaft 1.

The front external view which shows one form of this invention. The longitudinal cross-sectional view of FIG. AA sectional drawing of FIG. The longitudinal cross-sectional view which shows a modification. The disassembled perspective view of the knock member of a modification. The longitudinal cross-sectional view which shows the time of a knock. The longitudinal cross-sectional view which shows the further modification. 1 is a longitudinal sectional view showing Example 1. FIG. BB sectional drawing of FIG. FIG. 6 is a longitudinal sectional view showing a main part of a second embodiment. CC sectional drawing of FIG. FIG. 6 is a longitudinal sectional view showing Example 3. The half sectional view in FIG. FIG. 10 is a longitudinal sectional view showing the operation of the third embodiment. FIG. 6 is a longitudinal sectional view showing Example 4; The front external view of Example 5. FIG. FIG. 10 is a front external view showing a modification of the fifth embodiment. FIG. 10 is a front external view showing a modification of the fifth embodiment. FIG. 10 is a front external view showing a modification of the fifth embodiment. FIG. 10 is a longitudinal sectional view showing Example 6; FIG. 10 is a longitudinal sectional view showing Example 7.

DESCRIPTION OF SYMBOLS 1 Rear axis | shaft 1a Shaft cylinder 2 Front axis | shaft 2a Partition wall 3 Grip 4 Chuck body 5 Pressing slider 5a Step 6 Pressing transmission element 7 Through hole 8 Knock member 8a Gap 8b Transmitted part 8c Transmitting part 8d Transmission contact part 8e Fixed Part 9 Small diameter part 10 Elastic ring 11 Middle shaft 12 Large diameter part 13 Frame base 13a Conical surface 13b Abutting part 13c Conical part 14 Through hole 15 Root part 16 Vertical rib 17 Vertical groove 18 Core cylinder 19 Base plate 20 Chuck ring 21 Fastening cylinder 22 connecting portion 23 tip 24 core detent member 25 elastic member 26 through hole 27 connecting portion 28 soft member 29 eraser 30 cap 31 clip 32 corner 33 corner groove 34 gap 35 inner surface 36 slider 37 rotor 38 Cam groove 39 Bounce member 40 Chamfered portion 41 Spiral groove 42 Rod-shaped body guide member 43 Rod-shaped body receiving member 44 Projection 45 Gutter 46 Space portion 47 Joint member 48 Vertical groove 4 Projections 50 notch 51 anti-rotation unit 52 shaft connecting tubular portion 53 flat portion 54 cutout portion 55 projecting portion 56 contacts 57 elastic body

Claims (6)

A writing instrument in which a knock member is arranged on a side surface of a shaft cylinder, the knock member being provided so as to surround the entire circumference on the circumference of the shaft cylinder, and a piece base that moves back and forth by the operation of the knock member. A transmission unit comprising at least one member that is engaged with the knock member and transmits the operation of the knock member to the writing body and abuts to transmit the operation of the knock member to the writing body. At least one gap is provided between the contact portions, and the knock member is disposed so as to be swingable with respect to the shaft cylinder with the front portion or the rear portion of the knock member as a fulcrum, and the other end portion of the knock member. And the fulcrum is provided at a position on the opposite side of the axis of the shaft cylinder with respect to the pressing side of the surrounding portion of the knock member . The writing instrument according to claim 1, wherein at least one member of the transmission unit is urged rearward by a resilient member. A writing instrument in which a knock member is disposed on a side surface of a shaft cylinder, the knock member is provided so as to surround the entire circumference of the shaft cylinder, and the knock member is disposed at a front portion of the knock member or A rear part is used as a fulcrum, and the other end of the knock member is engaged with a frame base that moves back and forth by operation of the knock member, and the fulcrum is connected to the knock member. A writing instrument provided at a position on the opposite side of the axis of the shaft cylinder with respect to the pressing side of the surrounding portion . 4. The writing instrument according to claim 1, wherein an elastic body is interposed between the knock member and the shaft tube at the fulcrum. The writing instrument according to any one of claims 1 to 4, further comprising a clip and a rod-like body feeding device, wherein the rotation of the clip and the feeding of the rod-like body are linked to each other. The writing instrument according to any one of claims 1 to 5, wherein the diameter of the shaft cylinder in the vicinity of the front end and / or in the vicinity of the rear end of the knock member is larger than the maximum outer diameter of the knock member. Writing instrument to do.

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