JP4408709B2 - Writing instrument - Google Patents

Description

  The present invention relates to a writing instrument including a ballpoint pen, a correction tool, a cosmetic tool, and the like.

  There are various types of writing, one of which is known as a type in which the refill unit inserted into the shaft cylinder body can be replaced.

Although not shown, this type of writing instrument includes a replaceable refill unit that is inserted into the shaft cylinder body, and a knock mechanism that causes the ballpoint pen tip of the refill unit to protrude and retract from the opening tip of the shaft cylinder body by a knock operation. A knock mechanism is inserted into the shaft cylinder body, a coil spring interposed between the shaft cylinder main body and the refill unit, a plurality of cam strips provided on a detachable rear shaft cylinder constituting the end of the shaft cylinder body, and A rotor disposed at the end of the refill unit, a plurality of cams provided between the rotors and inserted between the plurality of cam strips, and a knock body that rotates the rotor in response to a knock operation (Refer to Patent Document 1).
JP 2003-63192 A

  The conventional writing instrument is configured as described above, and when replacing the refill unit, the rotor of the knock mechanism must be taken out of the main body of the shaft, so that it is difficult for some users to assemble again. There is. As a means for solving this problem, there is a method in which a protrusion that engages with the peripheral edge of the rotor is formed on the rear shaft cylinder, and the dropping of the rotor is regulated by the engagement of the protrusion.

  However, when the refill unit is thick, the refill unit may not be accommodated in the rear barrel. In this case, the size in the longitudinal direction of the rear barrel is shortened to cope with it. However, in this case, there is a high possibility that the projection of the rear barrel cannot be locked to the peripheral portion of the rotor. .

  The present invention has been made in view of the above, and an object of the present invention is to provide a writing instrument that can regulate the dropping of the rotor regardless of the length of the rear barrel.

In the present invention, in order to solve the above-mentioned problem, a hollow shaft tube, a refill unit slidably accommodated in the shaft tube, and a writing portion of the refill unit appear and disappear from the opening tip of the shaft tube by a knocking operation ( And a knock mechanism that appears and hides)
The shaft tube is composed of a front shaft tube that accommodates the refill unit in an exchangeable manner, and a hollow rear shaft tube that is detachably attached to the open end portion of the front shaft tube,
The knock mechanism includes a plurality of cam strips formed on the inner peripheral surface of the rear shaft cylinder, a rotor that is fitted in the rear shaft cylinder and disposed on the distal end side of the refill unit, and is formed on the rotor. A plurality of cams inserted between the plurality of cam strips, and a knock body that rotates the rotor in response to a knock operation,
A locking projection is formed on the inner peripheral surface of the rear barrel, and a locking projection for locking (hooking) the locking projection is formed on the cam.

The rear shaft cylinder and the rotor are arranged only on the end portion side of the refill unit, and the locked protrusion of the rear shaft cylinder and the locking protrusion of the cam are not in contact with each other during the knocking operation, and the rear shaft cylinder is removed. Sometimes it can be deployed to lock.
Further, an R surface or a tapered surface can be formed on at least one of the locked protrusion of the rear shaft cylinder and the locking protrusion of the cam.

In addition, a plurality of cam strips extending in the axial direction are arranged on the inner peripheral surface of the rear barrel at intervals in the circumferential direction, and the locked projections are arranged inward at the distal end portion of the inner peripheral surface of the rear barrel. It can also be formed.
Furthermore, the rotor is formed in a substantially cylindrical shape, and a plurality of cams extending in the axial direction are arranged on the outer peripheral surface at intervals in the circumferential direction, and a locking projection is formed on the distal end side of the cam surface. You can also

  Here, the shaft tube, the front shaft tube, and the rear shaft tube in the claims may be transparent or not. The rear barrel is screwed or tightly fitted into the open end of the front barrel. The refill unit may be thick or thin. The knock body may be directly exposed from the opening end portion of the rear barrel, or may be indirectly exposed through a decoration with a clip, a knock bar, or the like.

  Based on the knocking operation of the knock body during writing, the knock mechanism meshes the engagement claw formed on the cam by rotating the rotor and the engagement teeth formed on the cam strip, and from the opening tip of the shaft tube The writing part of the protruding refill unit is made unretractable, and based on the knocking operation of the knock body when not written, the rotor is rotated to release the engagement between the cam and the cam body, and each cam is connected to a plurality of cam lines. It is preferable that the writing part of the refill unit which is located between the bodies and protrudes from the shaft cylinder can be retracted.

  The protrusions and the locking protrusions are formed in, for example, a semicircular cross section, a substantially semielliptical cross section, a substantially rectangular cross section, a substantially polygonal cross section, and a substantially claw-shaped claw. Furthermore, the writing instrument according to the present invention includes at least various types of pens, correction tools, cosmetic tools, and the like.

  According to the present invention, when replacing the refill unit, the rear shaft cylinder, which is a part of the shaft cylinder, is removed from the front shaft cylinder, and the refill unit is taken out from the front shaft cylinder. At this time, the rotor of the knock mechanism may slide, but the locking protrusion of the cam is caught by the locked protrusion of the rear barrel, and the rotor does not fall off from the rear barrel. In addition, even when the writing instrument is assembled, the working process can be simplified because it does not fall out of the rear barrel.

  Further, if the rear shaft cylinder and the rotor are provided together on the end portion side of the refill unit, a writing instrument in which the shaft cylinder does not become thick even if the refill unit is thick can be obtained.

Also, if the locked projection of the rear shaft cylinder and the locking projection of the cam are arranged so as to be non-contact at the time of knock operation and locked at the time of removal of the rear shaft cylinder, there is no sense of incongruity at the time of knock operation. . That is, when the locked protrusion and the locking protrusion come into contact with each other at the time of the knocking operation, there is a risk of causing a malfunction.
On the other hand, according to the present invention, since it is non-contact at the time of knocking operation, it does not cause malfunction.

Further, if an R surface or a tapered surface is formed on at least one of the locked protrusion of the rear shaft cylinder and the locking protrusion of the cam, the manufacturing and assembling of the writing instrument becomes easy. In particular, it is possible to reduce the resistance when the rotor is inserted into the rear shaft cylinder and moved over.
Furthermore, if a locking projection is provided on the front end side of the cam, the sliding amount of the rotor that slides within the rear barrel can be increased.

  According to the present invention, there is an effect that the dropping of the rotor can be regulated regardless of the length of the rear barrel.

  Hereinafter, a preferred embodiment of the present invention will be described with reference to the drawings. A knock-type writing instrument according to this embodiment includes a hollow shaft tube 1 and a shaft tube 1 as shown in FIGS. A refill unit 20 that is slidably inserted and a Kern type knock mechanism 30 that causes the writing portion 23 of the refill unit 20 to appear and retract from the opening tip of the shaft tube 1 by a knocking operation are provided. The locking projection 9 is formed on the cam 38 of the knock mechanism 30, and the locking projection 40 that engages with the locking projection 9 is formed.

  As shown in FIG. 1, the shaft tube 1 includes a long hollow front shaft tube 2 that accommodates the refill unit 20 so as to be movable back and forth, and a short hollow shaft that is detachably screwed into an open end portion of the front shaft tube 2. The rear cylinder 8 is configured to be transparent using a predetermined synthetic resin made of polycarbonate or the like, and functions to allow the flow of outside air.

  As shown in FIG. 1, the front tube 2 is formed into a cylindrical shape with a tapered opening, and a cylindrical rubber for finger contact is formed in a region extending from the distal end to the vicinity of the center including the flange 3. The grip 4 is covered and accommodates the refill unit 20 in a replaceable manner.

  The front tube 2 is formed with a support step 5 projecting radially inward at the tip of the inner peripheral surface, and a female screw 6 for fastening the rear shaft is provided in the circumferential direction at the end of the inner peripheral surface. Is threaded. In a region extending from the front end of the outer peripheral surface of the front barrel 2 to the vicinity of the center, a plurality of bulging projections 7 extending in the axial direction of the front barrel 1 and the front barrel 2 are spaced at predetermined intervals in the circumferential direction. The bulging convex portions 7 that are arranged and exposed from the rubber grip 4 exhibit a magnifying lens function for the refill unit 20.

  As shown in FIGS. 2 to 7, the rear barrel 8 is formed in a cylindrical shape whose end face is slanted and is fitted with a clip body 11 that is a stopper, and is located on the end side of the refill unit 20. To do. The rear barrel 8 has a ring-shaped projection 9 to be engaged in the radially inward direction at the distal end portion of the inner peripheral surface thereof, and a male screw 10 is formed on the outer peripheral surface thereof in the circumferential direction. The male screw 10 is screwed with the female screw 6 of the front shaft cylinder 2 (see FIGS. 2 to 4). The to-be-latched protrusion 9 has an R surface having a substantially semicircular cross section, and functions to reduce resistance during assembly.

  As shown in FIG. 6 and FIG. 7, the clip body 11 includes an outer cylinder 12 whose end face is formed into an oblique cylindrical shape, and a flexible body extending from the outer cylinder 12 toward the distal end portion of the front barrel 2. The clip 13 is colored and integrally molded, and the end surface is integrally fitted along the end surface of the rear barrel 8.

  As shown in FIG. 1, the refill unit 20 is mounted in communication with, for example, a transparent ink containing tube 22 filled with a predetermined ink 21 and the tip of the ink containing tube 22, and when knocking (writing) And a writing portion 23 that protrudes from the opening tip of the front barrel 2. Examples of the ink 21 include pigment inks such as red, white, blue, black, and the like, and there is no particular question about the presence or absence of shear thinning.

  The ink storage tube 22 is formed into a long hollow using a predetermined material such as a synthetic resin, and is set to a predetermined light transmittance. The writing unit 23 includes a cover 24 that is fitted to the tapered distal end portion of the ink containing tube 22, and the cover 24 is provided with a chip that fits and holds the rotatable ball 25 so as to be retractable.

  As shown in FIG. 1 and FIG. 2, the knock mechanism 30 includes a spring member 31 for the refill unit 20 interposed between the front shaft cylinder 2 and the refill unit 20, and a plurality of formed on the rear shaft cylinder 8. A cam strip 32, a rotor 34 that is fitted into the rear shaft cylinder 8 through a gap and is detachably disposed on the end portion side of the refill unit 20, and a plurality of cam strips 32 formed on the rotor 34. And a knock body 41 for rotating the rotor 34 at a predetermined angle based on a knocking operation.

  As shown in FIG. 1, the spring member 31 is made of, for example, a coil spring or the like, and is detachably fitted into the front end barrel 2 in a state where the spring member 31 is detachably inserted into the tip portion of the ink containing tube 22. 2 is supported by the second support step 5 and is compressed by the refill unit 20 at the time of the knocking operation, or the advanced refill unit 20 is moved back to the original position when not in use.

  As shown in FIG. 4, the plurality of cam strips 32 are arranged at intervals in the circumferential direction of the inner peripheral surface of the rear barrel 8, and guide the plurality of cams 38 in the axial direction (longitudinal direction) of the barrel 1. To do. Each cam strip 32 is formed in a substantially linear strip or a rectangular thin plate extending in the axial direction of the shaft barrel 1 or the rear barrel 8, and the distal end portion is notched in the circumferential direction to form an engagement tooth 33.

  As shown in FIGS. 2 and 8, the rotor 34 is formed hollow using a synthetic resin such as polyacetal or polyoxymethylene, and is slidably fitted into the rear barrel 8. The shaft cylinder 2 is inserted into the end portion of the shaft cylinder 2 so as to be rotatable and movable back and forth, and is positioned on the end portion side of the refill unit 20.

  The substantially cylindrical rotor 34 includes a hollow hat-shaped diameter-expanding cylinder 35 that is opposed to the end portion of the refill unit 20, and a hollow long reduced diameter integrally communicating with the end portion of the diameter-expanding cylinder 35. A plurality of continuous saw teeth 37 are provided in the circumferential direction on the surface of the stepped portion between the diameter-expanded cylinder 35 and the diameter-reduced cylinder 36.

The plurality of cams 38 are arranged at intervals in the circumferential direction of the rotor 34 as shown in FIGS. Each cam 38 is formed in a substantially linear or rectangular thin plate extending in the axial direction of the shaft cylinder 1 or the rear shaft cylinder 8, and a distal end portion is linearly cut out in the circumferential direction to be inclined on the engaging claw 39. The engaging claw 39 engages with the engaging teeth 33 of the cam strip 32. A circular locking projection 40 shown in FIG. 8 bulges out on the front end portion of each cam 38, and the locking projection 40 is locked to the locked projection 9 of the rear barrel 8.
The locked protrusion 9 and the locking protrusion 40 are in a non-contact positional relationship when the knocking operation is performed, and are locked when the rear barrel 8 is removed.

  As shown in FIGS. 2 and 9, the knock body 41 is formed in a substantially cylindrical shape using ABS resin or the like, and is rotatably and detachably inserted into the reduced diameter cylinder 36 of the rotor 34. It is slidably inserted into the shaft cylinder 8 through a gap and exposed from the opening end portion so as to be knockable. A continuous drive tooth 42 is provided in the circumferential direction on the peripheral edge of the opening of the knock body 41, and the drive tooth 42 meshes with the saw tooth 37 of the rotor 34 completely or incompletely.

  When the knock body 41 is knocked at the time of writing, the knock mechanism 30 having such a configuration slides the rotor 34 in contact with the refill unit 20 in the direction of the front barrel 2 and each cam. 38 slides in the direction of the front barrel 2 while being guided by the plurality of cam strips 32, the engaging claws 39 of each cam 38 pass through the engaging teeth 33 of the cam strip 32, and the refill unit 20 is a spring member 31. The writing part 23 is protruded from the opening front end part of the front barrel 2 while compressing.

  When the engaging claw 39 of each cam 38 passes through the engaging tooth 33 of the cam strip 32, the rotation restriction of the rotor 34 by the cam strip 32 is released, and the drive teeth 42 of the knock body 41 are sawtooth of the rotor 34. 37 is completely meshed and pressed to apply driving force, and the rotor 34 rotates at a predetermined angle (for example, 30 ° or less), and the engaging teeth 33 of the cam strips 32 and the engaging claws 39 of the cams 38. And the retraction of the rotor 34 is regulated by this meshing, and the writing portion 23 of the refill unit 20 protruding from the opening tip of the front barrel 2 becomes non-retractable (regulated), enabling stable writing. Become.

  On the other hand, when writing is finished and the knock body 41 is knocked, the rotor 34 is pressed and slid in the direction of the front barrel 2 to release the mesh, and the drive teeth of the knock body 41 are also released. The rotor 34 is rotated by 42. When the knock body 41 is retracted, the protruding refill unit 20 is retracted in the direction of the rear barrel 8 by the restoring action of the spring member 31, and the cams 38 are positioned between the plurality of cam strips 32. The writing portion 23 of the refill unit 20 protruding from the opening tip of the shaft tube 2 is immersed in the front shaft tube 2.

  In the above configuration, when the refill unit 20 is replaced, the rear barrel 8 of the shaft cylinder 1 is loosened and removed, and the refill unit 20 is taken out from the front barrel 2. At this time, the rotor 34 of the knock mechanism 30 slides from the end portion direction of the rear barrel 8 toward the distal end portion while being guided by the plurality of cam strips 32. Since the locking projection 40 of the cam 38 is locked, the rotor 34 does not fall off from the rear barrel 8 and disassemble. Therefore, any user can easily assemble the knock mechanism 30.

  Further, even when the longitudinal dimension of the rear barrel 8 is shortened, the dropping of the rotor 34 can be restricted. Further, since the locking projection 40 is provided not on the front end side of the cam 38 but on the front end side of the cam 38, a long sliding amount of the rotor 34 can be secured.

  In the above embodiment, the plurality of bulging convex portions 7 are arranged at predetermined intervals in the circumferential direction in the region extending from the tip portion of the outer peripheral surface of the front barrel 2 to the vicinity of the central portion, but the present invention is not limited to this. Instead, the rubber grip 4 may be omitted by integrally forming a ring-shaped lens portion in a region extending from the front end portion to the vicinity of the central portion of the outer peripheral surface of the front barrel 2. Further, the rear barrel 8 can be lengthened, shortened, or integrated with the clip body 11.

  Moreover, although the to-be-latched protrusion 9 protrudes endlessly at the tip of the inner peripheral surface of the rear barrel 8, the present invention is not limited to this as long as the rotor 34 can be prevented from falling off. For example, a plurality of locked protrusions 9 may be arranged at a predetermined interval on the inner peripheral surface tip of the rear barrel 8. Furthermore, the locking projections 40 are formed to bulge on the front end side of each cam 38, but it is also possible to form a circular, rectangular, polygonal locking projection 40 on the front end side of any cam 38. it can.

It is whole section explanatory drawing which shows embodiment of the writing instrument which concerns on this invention. It is sectional explanatory drawing which shows the rear axis | shaft cylinder, clip body, and knock mechanism in embodiment of the writing instrument which concerns on this invention. It is explanatory drawing which shows the rear axis | shaft cylinder in embodiment of the writing instrument which concerns on this invention. It is a section explanatory view showing the rear barrel in the embodiment of the writing instrument according to the present invention. It is sectional explanatory drawing which shows the clip body in embodiment of the writing instrument which concerns on this invention. It is plane explanatory drawing which shows the clip body in embodiment of the writing instrument which concerns on this invention. It is side explanatory drawing which shows the clip body in embodiment of the writing instrument which concerns on this invention. It is a partial expansion section explanatory view showing a rotor in an embodiment of a writing instrument concerning the present invention. It is a fragmentary sectional view showing a knock body in an embodiment of a writing instrument according to the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Shaft cylinder 2 Lead axle cylinder 8 Rear axle cylinder 9 Locking protrusion 20 Refill unit 23 Writing part 30 Knock mechanism 31 Spring member 32 Cam strip 34 Rotor 38 Cam 40 Locking protrusion 41 Knock body

Claims (5)

A writing tool comprising a hollow shaft tube, a refill unit slidably accommodated in the shaft tube, and a knock mechanism that causes the writing portion of the refill unit to protrude and retract from the opening tip of the shaft tube by a knock operation,
The shaft tube is composed of a front shaft tube that accommodates the refill unit in an exchangeable manner, and a hollow rear shaft tube that is detachably attached to the open end portion of the front shaft tube,
The knock mechanism includes a plurality of cam strips formed on the inner peripheral surface of the rear shaft cylinder, a rotor that is fitted in the rear shaft cylinder and disposed on the distal end side of the refill unit, and is formed on the rotor. A plurality of cams inserted between the plurality of cam strips, and a knock body that rotates the rotor in response to a knock operation,
A writing instrument, wherein a locking projection is formed on the inner peripheral surface of the rear barrel, and a locking projection for locking the locking projection is formed on the cam.   The rear barrel and the rotor are provided only on the end side of the refill unit, and the locked projection of the rear barrel and the locking projection of the cam are brought into non-contact during the knocking operation, and are engaged when the rear barrel is removed. The writing instrument according to claim 1, which is arranged to stop.   The writing instrument according to claim 1 or 2, wherein an R surface or a taper surface is formed on at least one of the engagement protrusion of the rear shaft cylinder and the engagement protrusion of the cam.   A plurality of cam strips extending in the axial direction are arranged on the inner peripheral surface of the rear barrel at intervals in the circumferential direction, and the locked projections are directed inward at the distal end portion of the inner peripheral surface of the rear barrel. The writing instrument according to claim 1, 2 or 3 formed.   The rotor is formed in a substantially cylindrical shape, and a plurality of cams extending in the axial direction are arranged at intervals in the circumferential direction on the outer peripheral surface thereof, and a locking projection is formed on the distal end side of the surface of the cam. Item 5. A writing instrument according to any one of Items 1 to 4.

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