JP2012111040A - Writing utensil - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a writing utensil configured to store at least a mechanical pencil writing body in a shaft cylinder thereof, where a mechanical pencil lead can be easily refilled without disassembling the writing utensil, and also, the sudden popping out and powder leakage of the lead stored in the lead case pipe can be prevented.SOLUTION: The writing utensil 1 is configured to store at least the mechanical pencil writing body 11 in the shaft cylinders 2, 3 and protrude the lead end of the pencil writing body from the shaft tip by a feeding operation by means of a knock rod 7 connected to the trailing end of the pencil writing body. The knock rod includes: a rod body 7a connected to the trailing end of the lead case pipe 11a for storing the pencil lead 30 in the mechanical pencil writing body, and having a lead refill path 20 communicating with the lead case pipe, and to which the pencil lead can be inserted from the trailing end thereof; and a lid member 23 turnably provided on the side face of the rod body, configured to open the lead refill path in one state in which the lid member is locked in the rod body, and close the lead refill path in another state in which the lid member is locked in the rod body after changing from the one state by turning.

Description

  The present invention relates to a writing instrument in which a plurality of writing bodies are accommodated in a shaft cylinder, and a leading end portion of the writing body is projected from a shaft tip by an operation of feeding out the writing body.

2. Description of the Related Art Conventionally, a compound writing instrument having a structure in which a plurality of writing bodies are accommodated in a shaft cylinder and a tip portion of the writing body protrudes from a shaft tip by a predetermined feeding operation has been widely used.
For example, as a method of a mechanism for selectively feeding out one of a plurality of writing bodies accommodated in a shaft cylinder, a plurality of writing bodies respectively fixed to a plurality of knock operation units are provided in a vertical direction. A so-called knocking method is known in which the tip of one writing body is projected from the shaft tip and engaged with it selectively slidable along the groove.

When releasing the engagement of the selected cursive body in this knock method, it is released by projecting any other cursive body, and the cursive body is accommodated in the shaft cylinder by the action of a so-called return spring. The
In addition, as a writing body accommodated in the shaft cylinder, a mechanical pencil writing body, a ballpoint pen writing body, or the like is used.

Conventionally, it has been necessary to disassemble the shaft cylinder each time the lead pencil is replenished to the mechanical pencil writing body in the shaft cylinder.
That is, the shaft cylinder is disassembled, the mechanical pencil is removed, the lead case pipe is removed from the knock bar, and then the lead lead must be replenished from the upper end opening of the lead case pipe, which is complicated. There was a problem.

In order to solve such a problem, Patent Document 1 discloses a writing instrument in which a mechanical pencil is used as a main cursive body, and this and other cursive bodies are accommodated in a shaft cylinder so that the lead pencil can be easily replenished to the mechanical pencil cursive body. Is disclosed. Specifically, although it is a dual-type writing instrument, at the time of replenishment of the lead lead, the knock cover at the rear end of the writing tool is removed in the same manner as the single-type mechanical pencil writing tool, and the lead lead can be replenished therefrom.
Patent Document 2 discloses a writing instrument in which a core replenishment path that communicates the outside and a core case pipe is formed in a knock operation portion (knock bar) attached to a mechanical pencil writing body.
According to the writing instrument disclosed in Patent Document 2, a lead core can be replenished to the core case pipe from the rear end of the knock operation portion without disassembling the shaft tube.

JP 11-91289 A Japanese Patent Laid-Open No. 10-129189

However, in the writing instrument disclosed in Patent Document 1, it is necessary to remove the knock cover and the like when replenishing the lead lead, and there is a problem that the removed parts (knock cover and eraser) are easily lost. It was.
Further, in the writing instrument disclosed in Patent Document 2, since the rear end (rear end of the knock operation portion) of the core replenishment path is open, the knock operation is performed when the tip of the writing portion is directed upward. There is a risk that the lead core will inadvertently jump out from the rear end of the part, or the core powder accumulated in the core case pipe may leak and fall downward (hereinafter referred to as powder leakage).

  The present invention has been made paying attention to the above-described points, and in a writing instrument that houses at least a mechanical pencil writing body in a shaft tube, replenishment of a lead core can be easily performed without disassembling the writing instrument, And it aims at providing the writing instrument which can prevent inadvertent jumping out and the powder leakage of the lead lead accommodated in the lead case pipe.

In order to solve the above-described problems, a writing instrument according to the present invention includes at least a mechanical pencil writing body in a shaft cylinder, and the mechanical pencil is extended by a feeding operation of a knock bar connected to a rear end of the mechanical pencil writing body. A writing instrument for projecting a tip of a writing body from a shaft tip, wherein the knock bar is connected to a rear end of a core case pipe that accommodates a lead core in the mechanical pencil writing body, and communicates with the core case pipe A rod body in which a lead replenishment path into which a lead core can be inserted from the rear end is formed, and the rod replenishment path is opened in a state of being rotatably provided on the side surface of the rod body and locked to the rod body. And a lid member that rotates from the one state and closes the core replenishment path in another state in which the rod is locked to the rod body.
By constructing in this way, when refilling the lead pencil into the mechanical pencil writing body, it is not necessary to disassemble the main body shaft cylinder of the writing instrument, and the core replenishing path is opened by the lid member, and from the rear end of the rod body Lead core can be easily refilled into the core case pipe.
Further, when the lead core is not replenished, the lead core accommodated in the core case pipe can be prevented from inadvertently dropping by rotating the lid member and closing the core replenishment path.
The lid member may be attached not only to a mechanical pencil writing stick but also to a writing stick such as a ballpoint pen, a sign pen, or an eraser.

An inner cylinder disposed in the shaft cylinder, slidably holding the knock bar, and having a core replenishment hole communicating with a core replenishment path of the knock bar at a rear end thereof, and the inner cylinder A knock cover that is detachably provided at the rear end, and a lead core is drawn out from the tip of the mechanical pencil cursive when its head is pressed in the axial direction, and the side of the knock cover has a core replenishment A groove is formed, and it is desirable that the core replenishing groove can communicate with the core replenishing hole of the inner cylinder by arranging the core replenishing groove in the knock cover attached to the inner cylinder.
By comprising in this way, a lead core can be replenished, without removing a knock cover.
Further, the core replenishment path can be closed by shifting the position of the core replenishment hole and the position of the core replenishment groove of the knock cover, so that the lead core can be prevented from dropping more reliably. .

Moreover, it is desirable that the lid member provided rotatably on the side surface of the rod body closes the core replenishment path by rotating in the axial direction of the mechanical pencil writing body.
By comprising in this way, it can prevent that a cover member opens carelessly at the time of use of a writing instrument.
In addition, it is desirable that a protrusion is formed on the peripheral surface of the lid member, and that the protrusion is locked to the rod member so that the lid member is fixed to the rod member. If no external force is applied, the lid member does not rotate, and the holding force in a state where the lid member is locked to the rod can be improved.
Further, the lid member is preferably formed of a material having rubber elasticity such as a thermoplastic elastomer, thereby improving the holding force in a state where the lid member is locked to the rod body by the protrusion, and Thus, the opening / closing operation of the lid member by the user can be easily performed without slipping.
Further, in the case of a ballpoint pen that contains thermochromic ink or the like in the writing instrument, it can be discolored and decolored by rubbing the drawn line drawn with the lid member. In addition, when the lid member is formed of a thermoplastic elastomer including a plasticizer, it is also possible to erase a drawn line written with a mechanical pencil writing body or a drawn line written with a ballpoint pen containing an eraser erasable ink. .

  According to the present invention, in a writing instrument that houses at least a mechanical pencil writing body in a shaft cylinder, the lead core can be easily replenished without disassembling the writing instrument, and the lead core accommodated in the core case pipe Thus, it is possible to obtain a writing instrument that can prevent inadvertent jumping and powder leakage.

FIG. 1 is a cross-sectional view of the writing instrument according to the present invention broken in the center along the axial direction. FIG. 1 (a) shows a lead replenishment path for replenishing a lead pencil with a mechanical pencil writing instrument. FIG. 1B shows a closed state, in which the core replenishment path is opened. 2A is a side view of the inner cylinder disposed in the rear shaft of the writing instrument in FIG. 1, FIG. 2B is a cross-sectional view of FIG. 2A, and FIG. It is a front view of a rear end. 3 (a) is a front view of the knock bar, FIG. 3 (b) is a side view of the knock bar, FIG. 3 (c) is a sectional view of FIG. 3 (b), and FIG. 3 (d) is a knock. It is a front view of the rear end of a stick. Fig.4 (a) is a front view of the cover part attached to a knock stick, FIG.4 (b) is the side view. FIG. 5A is a cross-sectional view of the knock bar showing a state where the core replenishment path is closed by the lid member, and FIG. 5B is a cross-section of the knock bar showing a state where the core replenishment path is opened by the lid member. FIG. 6A is a cross-sectional view taken along the line AA in FIG. 1A, and FIG. 6B is a cross-sectional view taken along the line BB in FIG. FIG. 7 is a partially enlarged view showing a state where the lead core is replenished from the core replenishing groove of the knock cover.

  The writing instrument according to the present invention will be described based on the embodiment shown in FIG. FIG. 1 is a cross-sectional view in a state of being broken at the center along the axial direction of the writing instrument. FIG. 1A is a diagram illustrating a state where a lead replenishment path for replenishing a lead pencil with a mechanical pencil is closed. FIG. 1B shows a state in which the core replenishment path is opened.

A shaft cylinder constituting the writing instrument 1 is constituted by a front shaft 2 and a rear shaft 3. That is, the cylindrical connecting screw 2 a provided at the rear end portion of the front shaft 2 is screwed into the screw portion 3 a formed on the inner peripheral surface of the front end portion of the rear shaft 3, thereby the front shaft 2 and the rear shaft 3. Are combined to form a shaft cylinder.
The front shaft 2 is provided with a grip member 5 made of a rubber material so as to cover almost the entire peripheral side surface of the front shaft 2.
Moreover, in this Embodiment, the front-end | tip part 2b in which the front-end | tip of a writing body can be projected and retracted is formed when the front-end | tip of the front shaft 2 is diameter-reduced in a taper shape.

On the other hand, in the present embodiment, the rear shaft 3 is provided with a knock-type feeding mechanism. Specifically, a plurality of vertical grooves 6 (only one is shown in FIG. 1) are formed in parallel with the clip 4 provided on the rear side surface of the rear shaft 3.
The longitudinal grooves 6 are formed corresponding to the number of mechanical pencil writing bodies 11 accommodated in the shaft cylinder, but only the longitudinal grooves 6 corresponding to the mechanical pencil writing bodies 11 are shown in FIG. ing.

An inner cylinder 15 is disposed in the rear shaft 3.
2A is a side view of the inner cylinder 15, FIG. 2B is a sectional view thereof, and FIG. 2C is a front view of the rear end. A longitudinal groove 16 that overlaps the longitudinal groove 6 in a state of being disposed on the rear shaft 3 is formed on the peripheral surface of the inner cylinder 15. As shown in FIGS. 1A and 1B, a knock bar 7 (sliding member) is slidably held in the vertical groove 16. As the knock bar 7 slides, the knock bar 7 A projecting portion 7d formed at the rear end of the rear shaft slides along the longitudinal groove 6 of the rear shaft 3.
Further, a rear end portion of a core case pipe 11 a for accommodating the lead core 30 is attached to the front end portion 7 b of the knock bar 7, and the knock bar 7 and the mechanical pencil writing body 11 are coupled to each other.

  A spring receiving member 21 is disposed on the inner peripheral surface of the rear shaft 3 on the front end side, and a plurality of core case pipes 11a and other ball bend writing bodies are passed through the spring receiving member 21. A small hole 21a is formed, and the core case pipe 11a is fitted between a step portion (not shown) formed in the small hole 21a and the front end portion 7b of the knock bar 7. In this manner, the return spring 22 is arranged. As a result, the front end portion 7b of the knock bar 7 is movable in the direction of the writing axis while extending and retracting the return spring 22 with the spring receiving member 21.

Also, ribs 16a are formed in the longitudinal groove 16 of the inner cylinder 15, and the protruding portion of the knock bar 7 of, for example, the mechanical pencil writing body 11 from the state in which all the writing instruments are completely accommodated in the shaft cylinder. When 7d is pushed forward, the engagement protrusion 7e of the knock bar 7 is engaged with the end of the rib 16a.
As a result, in conjunction with the advancement of the knock bar 7, the mechanical pencil writing body 11 advances through the shaft case 11a through the core case pipe 11a, and the tip end portion thereof protrudes from the front end portion 2b.

  A cylindrical eraser receiver 15 b is provided at the rear end of the inner cylinder 15, and the eraser receiver 15 b is disposed so as to protrude from the rear end of the rear shaft 3. As shown in FIG. 1, a substantially cylindrical eraser 17 can be attached to the eraser receiver 15b. A knock cover 18 is detachably attached to the eraser receiver 15b (eraser 17).

In addition, when any of the writing bodies is housed in the shaft tube, the front end portion of the knock bar is locked to the front end portion 15a of the inner tube 15 by the urging force of the return spring 22. Has been made.
Further, the inner cylinder 15 is slidably disposed within a predetermined distance along the axial direction in the rear shaft 3 together with the cursive body to be held. When the head of the knock cover 18 (the eraser receiver 15b) is pressed in the axial direction with the tip of the mechanical pencil writing body 11 protruding from the tip 2b, the tip of the writing body is Since it is hold | maintained at the part 2b, the chuck | zipper which hold | grips the lead core 30 opens and the lead core 30 is drawn | fed out.
The knock cover 18 (the eraser receiver 15b) pushed into the rear shaft 3 protrudes from the original position, that is, the rear end of the rear shaft 3 by the urging force of the return springs 22 provided in all the writing bodies. Return to state.

On the other hand, the other pencils housed in the shaft cylinder together with the mechanical pencil writing body 11 are also provided with knock bars (not shown) that can slide along the longitudinal grooves 6 and 16.
And in the state which the front-end | tip part of the mechanical pencil cursive body 11 protrudes from the front-end | tip part 2b, the mechanical pencil cursive body 11 is pushed by pushing out the knock stick corresponding to another cursive body along the longitudinal grooves 6 and 16. The supporting knock bar 7 is disengaged from the rib 16 a formed in the longitudinal groove 16 of the inner cylinder 15, and the mechanical pencil writing body 11 is accommodated in the shaft cylinder by the action of the return spring 22. Then, the knocked bar of the other cursive that is pushed out engages with the rib 16a formed in the rear shaft 2, and the leading end of the cursive is protruded from the front opening 2b.

In addition, the compound writing instrument 1 according to the present invention is characterized in the configuration for replenishing the lead pencil 30 to the mechanical pencil writing body 11, and therefore the configuration will be described in more detail.
3 (a) is a front view of the knock bar 7, FIG. 3 (b) is a side view thereof, FIG. 3 (c) is a cross-sectional view of FIG. 3 (b), and FIG. FIG. FIG. 4A is a front view of a lid attached to the knock bar 7, and FIG. 4B is a side view thereof. 5A and 5B are cross-sectional views of the knock bar 7. FIG.

As shown in FIG. 3 (c), the knock bar 7 includes a bar body 7a having a distal end portion 7b coupled to the core case pipe 11a. The bar body 7a penetrates in the axial direction, and thereafter A lead replenishment path 20 is formed through which a mechanical lead lead core 30 can be inserted.
That is, as shown in FIG. 5 (b), when the lead case pipe 11a is coupled to the knock bar 7, lead from the rear end portion 7c (rear end of the lead supply path 20) of the knock bar 7 (rod body 7a) is lead. The lead 30 can be replenished to the mechanical pencil cursive 11.

  Further, a protrusion 7d formed on the rear end side of the rod body 7a is provided with a groove-like lid attachment hole 19 communicating with the core replenishment path 20. A lid member 23 shown in FIG. 4 is rotatably mounted in the lid mounting hole 19. That is, the lid member 23 is formed in a substantially semicircular disk shape, and shaft projections 23a serving as rotation shafts are provided on both side surfaces thereof. This shaft projection 23a is engaged with a bearing 19a formed on the left and right side surfaces of the lid mounting hole 19 as shown in FIG. 3, and the state shown in FIG. 5A (the state where the core replenishment path 20 is blocked). ) And the state shown in FIG. 5B (the state where the core replenishment path 20 is opened).

More specifically, on the rear side surface of the lid attachment hole 19, as shown in FIG. 5, a first locked portion 19b and a second locked portion 19c for locking the lid member 23 are provided. Is formed.
The lid member 23 includes a first locking portion 23b that can be locked to the first locked portion 19b and a second locking that can be locked to the second locked portion 19c. A portion 23c is formed.
That is, as shown in FIG. 5 (a), the first locking portion 23 b of the lid member 23 is locked to the first locked portion 19 b of the lid mounting hole 19, whereby the core replenishment path. 20 is closed by the lid member 23.
The lid member 23 is thus rotated in the axial direction (downward when the user uses the writing instrument 1) to close the core replenishment path 20, so that the lid can be closed while the writing instrument 1 is in use. It is possible to prevent the core replenishment path 20 from opening due to the member 23 rotating carelessly.

When the lid member 23 is rotated from the state shown in FIG. 5A, the second locking portion 23c of the lid member 23 is moved to the second position of the lid attaching portion 19 as shown in FIG. By engaging with the locked portion 19c, the core replenishment path 20 is opened, and the lead core 30 can be replenished.
In order to prevent the lid member 23 from rotating carelessly due to its own weight, a holding projection 23d (protrusion) for holding the state of FIG. A holding protrusion 23e (protrusion) for holding the state 5 (b) is provided. That is, the holding member 23d (23e) is locked to the rod body 7a, whereby the lid member 23 is fixed to the rod body 7a.
The lid member 23 is preferably formed of a material having rubber elasticity such as a thermoplastic elastomer, for example, so that the lid member 23 is held by the holding projection 23d (23e) in a state of being locked to the rod body 7a. The force can be improved, and the opening / closing operation of the lid member 23 by the user can be facilitated.

  Further, as shown in FIG. 2C, a core replenishing hole 15c is formed outside the eraser receiver 15b at the rear end portion of the inner cylinder 15. The core replenishment hole 15 c communicates with the core replenishment path 20 of the knock bar 7 connected to the mechanical pencil cursive 11. For this reason, for example, in the state where the knock cover 18 is removed, the lead core 30 can be inserted from the core replenishing hole 15 c and the lead core 30 can be replenished to the core case pipe 11 a of the mechanical pencil writing body 11.

6A is a cross-sectional view taken along the line AA in FIG. 1A, and FIG. 6B is a cross-sectional view taken along the line BB in FIG.
As shown in FIGS. 6 (a), 6 (b), and 1 (b), the side surface of the knock cover 18 is provided with a core replenishing groove 18a through which a lead core can be inserted. And by installing this knock cover 18 with the arrangement of the core replenishing groove 18a as shown in FIG. 6A, the core replenishing hole 15c of the inner cylinder 15 can be closed.
On the other hand, the knock cover 18 is rotated by a predetermined angle (for example, 90 °) around the axis from the state shown in FIG. 6A, and is mounted in the arrangement of the core supply groove 18a shown in FIG. And the core replenishment hole 15c of the inner cylinder 15 can be communicated with each other.

Therefore, even if the knock cover 18 is not removed, the knock cover 18 is arranged in the state shown in FIG. 6B, and the lid member 23 is arranged as shown in FIG. As shown in FIG. 7, the lead core 30 can be inserted from the core replenishing groove 18 a and the lead pencil 30 can be replenished to the mechanical pencil writing body 11.
On the other hand, when the lead core 30 is not replenished, the lid member 23 is disposed as shown in FIG. 1A (FIG. 5A) so that the core replenishment path 20 is closed or the knock cover 18 is closed. As shown in FIG. 6A, the core replenishing groove 18a may be closed, thereby preventing the lead core 30 from dropping from the rear end of the writing instrument and preventing powder leakage.

As described above, according to the embodiment of the present invention, the knock bar 7 connected to the mechanical pencil writing body 11 is provided with the core replenishment path 20 that communicates with the core case pipe 11a. A communicating core replenishing hole 15 c is provided at the rear end of the writing instrument 1. Further, the core replenishment path 20 can be opened and closed by a rotatable lid member 23 provided on the side surface of the knock bar 7.
With such a configuration, when the lead pencil 30 is refilled into the mechanical pencil writing body 11, it is not necessary to disassemble the main body barrel of the writing instrument 1, and refilling is easy from the core refilling hole 15c at the rear end of the writing instrument 1. can do.
Further, when the lead core 30 is not replenished, such as during normal use of the writing instrument 1, the lid replenishment path 20 is closed by rotating the lid member 23 so that the lead core 30 accommodated in the core case pipe 11a is undisturbed. Prepared fall and powder leakage can be prevented.

  Further, at the rear end of the writing instrument 1, the lead cover 30 can be replenished without removing the knock cover 18 by providing the knock cover 18 with a core replenishing groove 18a communicating with the core replenishing hole 15c. Further, the core replenishment path 20 can also be closed by shifting the position of the core replenishment hole 15c and the position of the core replenishment groove 18a of the knock cover 18 to prevent the lead core 30 from dropping or the like. Can do.

1 Writing instrument 2 Front shaft (shaft tube)
3 Rear shaft (shaft tube)
7 Knock stick 7a Rod body 11 Mechanical pencil writing body 11a Core case pipe 20 Core replenishment path 23 Lid member 30 Lead core

Claims (5)

A writing instrument that houses at least a mechanical pencil in a cylinder and projects the tip of the mechanical pencil from the shaft by a knock-out operation connected to the rear end of the mechanical pencil,
The knock bar is
A rod body that is connected to the rear end of a core case pipe that accommodates a lead core in the mechanical pencil writing body, communicates with the core case pipe, and has a core replenishment path into which the lead core can be inserted from the rear end;
Other state in which the core replenishment path is opened in one state locked to the rod body and rotated from the one state and locked to the rod body. And a lid member for closing the lead replenishment path. An inner cylinder disposed in the shaft cylinder, slidably holding the knock bar, and formed with a core replenishment hole communicating with the core replenishment path of the knock bar at a rear end thereof;
A knock cover that is detachably provided at the rear end of the inner cylinder, and a lead core is drawn out from a tip of the mechanical pencil writing body by pressing its head in the axial direction;
A core replenishing groove is formed on a side surface of the knock cover,
The writing instrument according to claim 1, wherein the core replenishing groove can communicate with the core replenishing hole of the inner cylinder by the arrangement of the core replenishing groove in the knock cover attached to the inner cylinder. The lid member that is rotatably provided on the side surface of the rod body,
The writing instrument according to claim 1 or 2, wherein the lead replenishing path is closed by rotating in a direction of an axis of a mechanical pencil writing instrument. A protrusion is formed on the peripheral surface of the lid member,
The writing instrument according to any one of claims 1 to 3, wherein the lid member is fixed to the rod body by the protrusions engaging with the rod body.   The writing instrument according to any one of claims 1 to 4, wherein the lid member is made of a thermoplastic elastomer.

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