JP5525409B2 - Writing instrument - Google Patents

Description

  The present invention relates to a writing instrument having a cap that can be attached to a main body so that the cap is not easily removed, and that the cap can be easily detached from the main body during writing.

  The cap of the writing instrument is detachably fitted to the tip of the main body in order to protect the writing tip. As a structure where the cap is detachably attached to the main body, an annular protrusion is formed on the main body, a small protrusion is provided on the inner surface of the cap, and when the cap is fitted to the main body, the small protrusion gets over the annular protrusion of the main body and both protrusions. Has been widely used (see Patent Document 1, for example). At the time of writing, if the main body is supported and the cap is pulled strongly, the protrusions are disengaged and the cap can be removed from the main body.

  Usually, the cap is provided with a clip so as to be hooked and held on an edge of a pocket or the like. However, as mentioned above, since the cap of the conventional writing instrument is only attached to the main body by engaging the protrusion provided on the outer surface of the main body and the inner surface of the cap, when an impact or tensile force acts on the main body, The caps may fall off due to the disengagement between the protrusions.

  A configuration in which the cap and the main body are screw-fitted is also known. However, in this configuration, the cap has to be rotated around the main body in use, so that the handling is troublesome.

JP-A-11-208185 (paragraph 0005, FIG. 2)

  SUMMARY OF THE INVENTION An object of the present invention is to provide a writing instrument with a cap that can easily and reliably attach a cap to a main body and that can be easily removed by a knocking operation when writing.

  According to the present invention, a cylindrical main body having a main body side locking portion on the outer surface of the front portion and storing a refill therein, a cylindrical main body cover having one end opened to store the main body, and the main body An arm portion which is provided inside the cover so as to be capable of moving forward and backward in the axial direction and has a diameter that is rearwardly enlarged so as to surround the front portion of the main body, and a spring for biasing the arm portion in the backward direction; When the arm portion is moved in the axial direction of the main body cover by knocking operation, a cam mechanism that holds the arm portion in the forward position and the backward position, respectively, and the diameter of the arm portion is reduced when the arm portion is in the forward position. Means for inserting the tip portion of the main body into the arm portion, moving the arm portion to the advanced position, engaging the main body side locking portion and the arm side locking portion, and holding the main body in the main body cover. At the same time, knock the main body and move the arm part to the retracted position. Writing instrument, wherein the body by removing the engagement of the arm side engagement portion is moving and the body side locking portion it has to remove from the body cover is provided, the problems are solved.

  According to the present invention, the cam mechanism includes a fixed cam that is fixed in the main body cover and has an inward protrusion, and is provided in the fixed cam so as to be movable in the axial direction and rotatable. A cylindrical cam cylinder having a heart-shaped cam groove to enter, and a cam receiver connected to the inside of the cam cylinder and forming the arm part at the rear, and the fixed cam moves the arm part when the arm part moves forward. The writing instrument is provided as a means for reducing the diameter. Further, a guide piece and a guide protrusion are provided between the fixed cam and the cam cylinder, which are elastically engaged and disengaged so as to give resistance to the movement of the cam cylinder when the cam cylinder moves to the forward movement position or the backward movement position. Writing instruments are provided.

  The present invention is configured as described above, and has a cylindrical main body having a main body side locking portion on the outer surface of the front portion and storing a refill therein, and a cylindrical main body having one end opened to store the main body. A cover, an arm part that is provided inside the main body cover so as to be capable of moving forward and backward in the axial direction, has a diameter that extends rearward so as to surround the front part of the main body, and has an arm-side locking portion; A spring that biases, a cam mechanism that holds the arm part in the forward position and the backward position when the arm part is moved in the axial direction of the main body cover by a knock operation, and an arm when the arm part is in the forward position. Means for reducing the diameter of the body, inserting the tip of the main body into the arm section, moving the arm section to the advanced position, and engaging the main body side locking section and the arm side locking section to connect the main body to the main body. Hold it in the cover and knock the main body The arm is moved to the retracted position to disengage the arm-side locking portion from the body-side locking portion and the main body is removed from the main body cover. When it is moved, the arm part is reduced in diameter so that the arm side locking part and the main body side locking part are engaged, and the main body is chucked by the arm part so that the main body cover does not come off even if vibration or impact is applied. The tip of the body can be capped.

  In addition, when the main body is knocked, the arm portion is moved to the retracted position by the cam mechanism and the arm portion is enlarged in diameter, so that the engagement between the arm side locking portion and the main body side locking portion is released, and the chuck of the main body is released. The main body can be easily removed from the main body cover. When a guide piece and a guide protrusion are provided between the fixed cam and the cam cylinder constituting the cam mechanism to elastically engage and disengage the cam cylinder when the cam cylinder moves to the forward or backward position. When knocking, the knocking action can be confirmed and it is easy to use.

Sectional drawing of the state which locked the main body which shows one Example of this invention. Sectional drawing of the state which unlocked the main body. Sectional drawing of use condition. The main body cover is shown, (A) is sectional drawing of the part away from the rib, (B) is sectional drawing of the part along a rib, (C) is CC sectional view taken on the line of FIG. The cam receiver is shown, (A) is a plan view, (B) is a front view, (C) is a sectional view, and (D) is a side view. The fixed cam is shown, (A) is a bottom view, (B) is a front view, (C) is a sectional view, and (D) is a side view. A cam cylinder is shown, (A) is a top view, (B) is a sectional view, (C) is a bottom view, and (D) is a side view. Explanatory drawing of a cam. A guide piece and a guide protrusion are shown, (A) is an explanatory view as seen from the longitudinal section of the cam cylinder, (B) is an explanatory view as seen from the bottom, and (C) is an explanation as seen from a cross section along the cam cylinder. Figure. The expanded sectional view of a part of locked state. The expanded sectional view of a part of state in the middle of unlocking. The expanded sectional view of a part of the state which cancelled | released the lock | rock.

  1 to 3, the writing instrument of the present invention includes a cylindrical main body 1 in which a refill 2 is accommodated, and a cylindrical main body cover (cap) 4 having an opening 3 at one end so as to accommodate the main body. And the length of the main body cover 4 is slightly longer than the main body 1 so that the rear end of the main body 1 slightly protrudes from the main body cover 4 in a state where the main body 1 is housed in the main body cover 4. Yes. The main body 1 has a main body side locking portion 5 formed on the outer surface of the front portion, and in the embodiment shown in the figure, a concave portion is formed on the outer surface of the taper 6 attached to the front portion to form the locking portion 5. The concave portion can be formed as a convex portion. In the embodiment shown in the drawing, the refill 2 is a ballpoint pen refill, but can be applied to markers, mechanical pencils, and other appropriate refills. The refill 2 is inserted from the rear end of the main body 1, the writing end 7 protrudes from the front end of the taper 6, and the rear portion is supported by a tail plug 8 attached to the rear end of the main body 1.

  The main body cover 4 has a bottom portion 9, and as shown in FIG. 4, a support shaft 10 extending in the axial direction is formed at the center of the bottom portion 9, ribs 11 are formed along the inner wall of the main body cover, and the bottom portion 9 In the vicinity, a main body cover side locking portion 12 is provided. The length of the rib 11 is such that the writing end 7 of the main body 1 is exposed from the main body cover 4 when the main body cover 4 is removed and the rear end of the main body 1 is inserted from the opening 3 of the main body cover 4. The length of the main body 1 is set so as not to immerse into the main body cover when the tip of the rib 11 hits the rear end of 1 and the writing pressure is applied (see FIG. 3).

  An arm portion 13 is provided in the main body cover 4 so as to be capable of moving forward and backward in the axial direction of the main body cover, and the arm portion 13 has a diameter expanded rearward so as to surround the taper 6 of the main body 1. doing. The arm portion 13 has a rear end that spreads outward due to its own elasticity, and can be elastically reduced in diameter. The arm portion 13 is provided with an arm side locking portion 14 that can be engaged with the main body side locking portion 5. In the embodiment shown in the figure, since the main body side locking portion 5 is formed in a concave portion, the arm side locking portion 14 is formed in a convex portion. The main body side locking portion 5 may be formed as a convex portion and the arm side locking portion 14 may be formed as a concave portion, or both locking portions may be formed on a meshing surface or a rough surface having a substantially chevron cross section ( (Not shown).

  As shown in FIG. 5, the arm portion 13 is formed integrally with the cam receiver 15 and is biased in the backward direction by a spring 16 attached to the support shaft 10 of the main body cover 4. The cam receiver 15 is formed in a substantially cylindrical shape having the arm portion 13 on the rear end side, and the arm portion 13 is opposed in a semicircular shape through a split groove 17, and extends along the inner surface to the arm side. Protrusions serving as the locking portions 14 are formed. A raised portion 18 is formed on the outer surface of the arm portion 13. A hole 19 for receiving the writing end 7 of the refill 2 is formed inside the cam receiver 15. A receiving hole 20 into which one end of the spring 16 enters is formed on the front end side of the cam receiver 15. Further, a cam receiving side locking portion 21 having an inclined surface and a receiving groove following the inclined surface is provided on the outer periphery of the front portion, and the cam receiving side locking portion 21 can be bent inward during assembly. A slit 22 is provided.

A cam mechanism is provided for holding the arm portion in the forward position and the backward position when the arm portion 13 is moved in the axial direction of the main body cover 4 by a knock operation. As a cam mechanism having such a function, various cam mechanisms used in knock type writing instruments and the like are known, and these cam mechanisms can be appropriately employed. In the embodiment, as described below, a heart cam mechanism using a so-called heart-shaped cam groove is shown. In FIG. 1, a fixed cam 23 is fixed in the main body cover 4. As shown in FIG. 6, the fixed cam 23 is formed in a cylindrical shape inscribed in the main body cover, and on the outer surface, the fixed cam side locking portion that engages with the main body cover side locking portion 12 of the main body cover 4. 24 and a receiving groove 25 into which the rib 11 formed on the main body cover 4 enters so as to prevent the rotation of the fixed cam, and an inward projection 26 projects from the inner surface. Further, a guide piece 28 having a free end at one end is formed on the wall portion of the fixed cam 23 facing the inward projection 26 via a substantially U-shaped notch 27. The inner surface of the free end side of the guide piece sliding protrusion 29 is provided, the free end is pivotable resiliently radially.

  A cam cylinder 30 is inserted in the fixed cam 23 so as to be movable and rotatable in the axial direction. As shown in FIG. 7, a substantially heart-shaped cam groove 31 into which the inward projection 26 of the fixed cam 23 enters is formed on the outer surface of the cam cylinder 30. The cam groove 31 is formed in an annular shape, and has an inclined inlet portion 32 on the front end side for inserting the inward projection 26 into the cam groove 31 during assembly. As shown in FIG. A storage step 33 for engaging the inner protrusion 26 when the main body 1 is stored and locked, and a release step 34 for engaging the inner protrusion 26 when the main body 1 is removed from the main body cover 4 and unlocked. After the cam cylinder 30 is moved to the left in FIG. 8 by a knocking operation, the knocking operation is stopped and the cam cylinder 15 moves to the right in FIG. An inward projection 26 is provided in an annular shape so as to circulate and move between the stepped portion 33 and the release stepped portion 34. Actually, since the fixed cam 23 does not rotate, this movement is performed by the cam cylinder 30 moving back and forth in the axial direction and rotating. The cam cylinder 30 is formed with an inner diameter that can accommodate the cam receiver 15, and a cam cylinder side locking portion 35 that engages with the cam receiving side locking portion 21 of the cam receiver 15 is provided on the inner surface. Yes. In the embodiment shown in the figure, the cam cylinder side locking portion 35 is formed as an annular protrusion that enters the receiving groove of the cam receiving side locking portion 21.

A guide protrusion 36 is provided on the outer surface of the cam cylinder 30 so that the slide protrusion 29 provided on the guide piece 28 of the fixed cam 23 is brought into sliding contact with and disengaged so as to give a click feeling to the movement of the cam cylinder 30. . As shown in FIGS. 7 and 9, the guide protrusion 36 has a cross-section in which one end is inclined in a guide recess 37 provided on the surface of the cam cylinder 15 opposite to the cam groove corresponding to the cam groove 31. It is formed in a substantially mountain shape. On the front end side of the guide recess 37, there is an inclined inlet portion 38 through which the slide projection 29 passes during assembly, and a storage step from a portion corresponding to the release step portion 34 of the cam groove 31 in the guide recess 37. The inward projection 26 is provided at a part on the way to a part corresponding to the part 33 and a part corresponding to a part that is detached from the storage step part 33 from the part corresponding to the storage step part 33. Then, when the knocking operation, the guide piece 28 when the slide projection 29 gradually rides on the inclined surface of the guide projection 36 is warped outwardly, when passing through the said guide protrusions 36, i.e. the slide protrusion 29 is Ru disengaged from the inclined surface The warpage of the guide piece 28 returns, and the small impact at this time is transmitted to the knocking person (user).

  A means for reducing the diameter of the arm portion 13 when the arm portion 13 is in the forward movement position is provided in the main body cover 4. In the embodiment shown in the figure, when the arm portion 4 moves to the forward movement position, the raised portion 18 of the arm portion 13 slides on the inner surface of the rear end of the fixed cam 23 so that the diameter of the arm portion 13 is reduced. A reduced diameter surface 39 that is gently inclined is formed on the inner surface of the rear portion. In addition to the fixed cam 23, a pressing rib, an annular protrusion, or the like may be provided at an appropriate position on the inner surface of the main body cover 4 so that the arm portion can be reduced in diameter (not shown).

  The use state will be described with reference to FIGS. 10 to 12. The writing end 7 of the main body 1 is inserted into the main body cover 4 from the opening 3 of the main body cover 4, and the writing end 7 is inserted into the hole 19 of the cam receiver 15. When the cam receiver 15 is pushed forward, the arm 13 moves forward. When the pressing is stopped, the inward projection 26 of the fixed cam 23 is engaged with the storage step portion 33 of the cam cylinder 30 via the fixed cam 23 and the cam cylinder 30, and the arm part 13 is held at the forward position. 13 is reduced in diameter. As a result, the arm side locking portion 14 and the main body side locking portion 5 are engaged, and the main body 1 is chucked by the arm portion 13 and locked in a state of being housed in the main body cover 4 (FIGS. 10 and 1). There is no possibility that the main body 1 is detached from the main body cover 4 due to vibration or impact.

  To release the lock, when the rear end of the main body 1 protruding from the main body cover 4 in the state shown in FIG. 1 is knocked, as shown in FIG. The cam cylinder 30 and the cam receiver 15 are retracted by the action of the spring to a position where the inward projection 26 moves from the storage step portion 33 of the cam groove 31 to the release step portion 34, and is held in the retracted position. Then, the arm portion 13 is detached from the fixed cam 23 and is expanded in diameter by its own elastic action, and the engagement between the arm side locking portion 14 and the main body side locking portion 5 is released. Therefore, the main body 1 can be freely released and the main body cover 4 can be removed, and the rear end can be inserted into the main body cover 4 as shown in FIG.

  As the heart-type cam mechanism, in the embodiment, an inward projection is provided on the fixed cam and a cam groove is formed on the cam cylinder. However, the cam groove is formed on the fixed cam and the cam cylinder is engaged with the cam groove. Protrusions may be provided (not shown).

DESCRIPTION OF SYMBOLS 1 Main body 4 Main body cover 5 Main body side latching | locking part 13 Arm part 14 Arm side latching | locking part 15 Cam receiver 16 Spring 23 Fixed cam 26 Inward protrusion 30 Cam cylinder 31 Cam groove

Claims (5)

A cylindrical main body having a main body side locking portion on the outer surface of the front portion and storing a refill inside, a cylindrical main body cover having one end opened to store the main body, and an axial direction inside the main body cover The arm part is provided so as to be able to move forward and backward and expands rearward so as to surround the front part of the main body, has an arm side locking part, a spring for biasing the arm part in the backward direction, and knocking operation of the arm part comprising when moving in the axial direction of the body cover, and a cam mechanism for holding each said arm portion in the forward position and the retracted position, the means for reducing the diameter of the arm portion when the arm portion is in the forward position by, the The cam mechanism has a fixed cam that is fixed in the main body cover and has an inward projection, and a substantially heart-shaped cam groove into which the inner protrusion enters and is provided so as to be axially movable and rotatable in the fixed cam. Connected to the cam barrel and the inside of the cam barrel Re rear portion provided with a cam receiver formed with the arm portion, the engagement of the tip portion is inserted into the arm portion the arm is allowed the body side locking portion moves to the forward position and the arm side engagement portion of the main body The main body is held in the main body cover, and the main body is knocked to move the arm portion to the retracted position so that the arm side locking portion and the main body side locking portion are disengaged to remove the main body from the main body cover. A writing instrument characterized by that.   The writing instrument according to claim 1, wherein the rear portion of the fixed cam is a means for reducing the diameter of the arm portion when the arm portion moves forward.   The writing instrument according to claim 1 or 2, wherein a guide piece having a slide protrusion is formed on the fixed cam, and a guide protrusion for providing resistance to movement of the slide protrusion is provided on the cam cylinder.   The writing instrument according to claim 1, wherein the main body cover is formed longer than the main body.   The writing instrument according to claim 4, wherein a rib is formed in the main body cover so that the rear end of the main body contacts when the main body is inserted from the rear end side.

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