JP2021045915A - Writing instrument - Google Patents

Abstract

To provide a writing instrument with excellent operability that can be reliably released through the light operation of an operation knob, particularly in the release operation to retract a writing portion in the fed state.SOLUTION: There is provided a writing instrument in which a writing refill 5 having a writing portion 5a is housed in a barrel 1 and which can be switched between a feeding state in which the writing portion is fed from a mouth portion 3 and a release state in which the writing portion is housed in the mouth portion. The writing instrument includes a spring 7 which urges a slide piece 10 to which a rod 12 is swingably attached together with the writing refill in the backward direction, an operation cylinder 9 arranged between the slide piece and the barrel to support the slide piece so as to be slidable in the axial direction and to be movable in the axial direction in the barrel cylinder, and an operation knob 13 attached to the operation cylinder and arranged so as to be movable along the barrel.SELECTED DRAWING: Figure 2

Description

The present invention relates to a writing instrument such as a ballpoint pen, and relates to a writing instrument in which the operability of a tip writing portion (ballpoint pen tip) feeding operation from the mouth portion and a release operation thereof is improved.

In writing tools such as ballpoint pens, knock-type ballpoint pens are known in which the ballpoint pen tip appears and disappears from the tip of the mouth by knocking the knock rod placed at the rear end of the barrel, which is so-called in many products. A rotary feeding mechanism called a Khanh knock mechanism is adopted.
This khan knock mechanism is disclosed in, for example, Patent Document 1, and a rotor having protrusions intermittently provided along the outer peripheral surface is arranged in the axle cylinder, and the inner peripheral surface on the axle cylinder side is provided. A plurality of axially long cam portions that cooperate with the protrusions of the rotor are provided. Then, the protrusion on the rotor side is locked or unlocked to the cam portion on the barrel side by the knock operation, so that the writing portion is extended (writing possible state) and released (non-writing state). And are switched.

According to the above-mentioned rotary feeding mechanism, in order for the rotor protrusion to be locked with the cam portion on the axle cylinder side by the knock operation, the rear end portion of the rotor protrusion is at least the cam portion on the axle cylinder side. It is necessary to move the rotor toward the front in the axial direction from the front end.
After moving the rotor to a predetermined position, when the force applied to the knock rod is released, the rotor is slightly retracted while rotating due to the urging force of the spring, and the rear end of the rotor protrusion is on the axle cylinder side. Locks to the front end of the cam part of. As a result, the ballpoint pen tip protrudes from the tip of the mouth and is in a feeding state.

When the rotor is moved forward by the knock operation again in the extended state of the writing portion, the rear end portion of the rotor protrusion is released from the lock on the front end portion of the cam portion on the barrel side and rotates. The child rotates. Then, when the force applied to the knock rod is released, the rotor moves backward due to the urging force of the spring, which causes the ballpoint pen tip to retract into the tip of the mouth and is in the released state.

That is, in order to return from the feeding state to the released state, it is necessary to further compress the compressed spring by a knocking operation, which is larger than the force required for the knocking operation to bring the spring into the feeding state. Power is needed.
Therefore, in reality, it can be said that it is difficult for children, the elderly, and the like to perform the knock operation, for example, it is necessary to pick up the barrel and perform the knock operation.

The writing tool disclosed in Patent Document 2 can solve the above-mentioned problem, and the writing body (writing refill) attached to the slider can be moved forward and forward in the shaft cylinder by the axial movement operation of the operation button. It moves backward.
To do this, the cursive is moved with a larger movement stroke with respect to the movement distance of the operation button by utilizing the suction and repulsion action between the first magnet and the second magnet housed in the barrel. It is composed of.
Therefore, according to the writing tool disclosed in Patent Document 2, it can be configured without using the spring required in the Khanh Knock mechanism disclosed in Patent Document 1, and a large force is inevitably required for the knock operation. The problem of being there is solved.

Further, Patent Document 3 discloses a feeding mechanism of an eraser provided in a writing tool. This eraser is arranged at the rear end of the barrel, and a swingable movable pin is attached to a holder that holds the eraser. Therefore, in order to hold the eraser in the extended state, it is necessary to face the rear end of the barrel on which the eraser is arranged. Further, in order to release the extended state of the eraser, it is necessary to invert the shaft cylinder and put the shaft cylinder in a substantially vertical posture with the tip of the mouth facing down.

Since the eraser feeding mechanism disclosed in Patent Document 3 can also be configured without using the spring required for the Khanh Ngoknock mechanism disclosed in Patent Document 1, this configuration can be configured without using the feeding mechanism of the tip writing portion. The problem of the Khanh knock mechanism that a large force is required for the knock operation can be solved.

Japanese Unexamined Patent Publication No. 2011-42035 JP-A-2018-158522 JP 2015-20282

As described above, according to the feeding mechanism disclosed in Patent Documents 2 and 3, the problem of the Khanh Knock mechanism disclosed in Patent Document 1 can be solved.
However, according to the cursive feeding mechanism using the magnetic force disclosed in Patent Document 2, the optimum arrangement relationship between the first magnet and the second magnet is examined, and the stability of the cursive movement using the magnetic force is determined. There is still room for improvement in practical use, such as securing.
Further, even if the eraser feeding mechanism disclosed in Patent Document 3 is adopted for the feeding mechanism of the writing portion, it is necessary to take a certain posture in which the barrel is vertically upright in order to switch from the feeding operation to the releasing operation. There is still room for improvement in terms of usability.

The present invention has been made based on the above-mentioned technical viewpoint, and an object of the present invention is to provide a writing instrument in which the operability of the tip writing portion is extended from the mouth portion and the release operation thereof is improved. In particular, in the release operation of retracting the writing portion in the extended state, it is a main subject to provide a writing instrument having excellent operability that can be surely put into the release state by a light operation of the operation knob.

In the writing instrument according to the present invention, which has been made to solve the above-mentioned problems, a writing refill having a writing portion is housed in the barrel, and the writing portion is extended from the mouth end of the front end of the barrel by advancing the writing refill. It is a writing tool that can be switched between a state and a release state in which the writing part is accommodated in the mouth part by retracting the writing refill. Together with the writing refill, a slide piece to which the rod is swingably attached is urged in the retracting direction. The operation cylinder, which is arranged between the slide piece and the shaft cylinder to support the slide piece so as to be slidable in the axial direction, and is arranged so as to be movable in the axial direction in the shaft cylinder, and the operation. An operation knob attached to the cylinder and arranged so as to be movable along the shaft cylinder is provided, and the operation cylinder, the slide piece, and the writing refill are moved forward as the operation knob is operated in the forward direction. The tip of the swingable rod attached to the slide piece is locked to a locking portion formed in the barrel, and the writing portion is set to the extended state.

In this case, it is desirable that the operation cylinder is formed with a guide portion that surrounds the rod that is swingably attached to the slide piece, and the guide portion is used by operating the operation knob in the retracting direction. By guiding the position of the tip of the rod, the tip of the rod is configured to release the locking to the locking portion formed in the barrel.

In addition, as the tip of the rod releases the lock to the locking portion, a contact portion that regulates the retracted position of the operating cylinder that receives the urging force of the spring is formed in the shaft cylinder. It is desirable to be there.

According to the writing instrument according to the present invention described above, by moving the operation knobs movably arranged along the shaft cylinder forward, the slide piece and the writing refill are combined with the operation cylinder in the shaft cylinder to which the operation knobs are attached. Etc. move forward.
As a result, the tip of the swingable rod attached to the slide piece is locked to the locking portion formed in the barrel, and the writing portion of the writing refill is extended from the mouth portion so that writing is possible. Can be set to.

On the other hand, by moving the operation knob backward in the drawn state of the writing portion, the tip position of the rod is guided by the guide portion formed in the operation cylinder, and the tip portion of the rod guides the tip position of the rod in the shaft cylinder. The locking to the locking portion is released.
As a result, the slide piece, the operation cylinder, the operation knob, and the like are retracted together with the writing refill by the action of the spring that urges the writing refill and the like in the retracting direction, and the writing refill and the like are returned to the released state. In particular, the above-mentioned operation to the released state can be realized by moving the operation knob backward by about 2 to 3 mm with a light touch, and it is possible to provide a writing tool having excellent operability.

The appearance composition of the whole writing instrument which concerns on this invention is shown, (A) is the top view of the extended state of a writing part, and (B) is the front view of the extended state of a writing part. A cross-sectional view of the entire writing instrument shown in FIG. 1 is shown, FIG. 1A is a cross-sectional view of the writing unit in a fed-out state, and FIG. A single item configuration of a mouthpiece attached to the front shaft of a writing instrument is shown, (A) is a perspective view with the tip portion in front, (B) is a top view, and (D) is a cross-sectional view. A single item configuration of the rear shaft is shown, (A) is a perspective view, (B) is a top view, and (C) is a cross-sectional view. The operation cylinder is shown as a single item, (A) is a perspective view, (B) is a top view, and (C) is a cross-sectional view. A single piece configuration of the slide piece is shown, (A) is a perspective view, and (B) is a cross-sectional view. The lid body attached to the slide piece shown in FIG. 6 is shown as a single item, where FIG. 6A is a perspective view and FIG. 6B is a cross-sectional view. A single rod configuration attached to the slide piece shown in FIG. 6 is shown, (A) is a front view, and (B) is a perspective view. The operation knob attached to the operation cylinder shown in FIG. 5 shows a single item configuration, (A) is a perspective view, and (B) is a perspective view with a different viewpoint.

The writing tool according to the present invention will be described based on the embodiment shown in the figure.
In each of the drawings shown below, the same parts are indicated by the same reference numerals, but in some drawings, representative parts are indicated by reference numerals due to space limitations, and the detailed configuration thereof is described for each individual item. In some cases, the reference numerals given to the drawings of the above may be cited for explanation.

1 and 2 show the overall configuration of a writing instrument provided with a ballpoint pen tip as a tip writing portion, and the writing instrument constitutes a shaft cylinder 1 by a cylindrical front shaft 1A and a rear shaft 1B.
A cylindrical front connecting body 2 having a female screw on the inner peripheral surface of the tip and a male screw on the outer peripheral surface of the rear end is attached to the front end of the front shaft 1A, via the front connecting body 2. For example, a metal mouthpiece (mouthpiece) 3 is attached to the tip side, and a decorative cylinder is formed so as to cover the front half of the front connecting body 2 between the mouthpiece 3 and the front shaft 1A. 4 is attached.

As shown in FIG. 3, the front half of the mouth portion 3 is formed into a conical shape, and the tip portion is provided with an opening 3a, which is accommodated in the barrel 1 from the opening 3a. The tip writing portion (ballpoint pen tip) 5a of the writing refill 5 is configured to appear and disappear.
Further, the latter half of the mouth portion 3 constitutes a thin cylindrical portion 3b, and a male screw 3c is formed on the outer peripheral surface thereof. The tip portion 3 is attached to the front shaft 1A by screwing the male screw 3c into the female screw formed on the inner peripheral surface of the tip of the front connecting body 2.

As shown in FIG. 3C, the opening 3a of the mouth tip portion 3 is formed of a circular inner peripheral surface having a predetermined length in the axial direction and having substantially the same inner diameter along the axial direction. Has been done.
Then, the inner diameter is expanded stepwise at the rear end portion of the opening 3a, and this stepped enlarged portion constitutes a spring receiving portion 3d that receives the front end portion of the spring 7, which will be described later.
Further, the mouth tip portion 3 is in a state in which the opening axis L2 passing through the center portion of the opening portion 3a is inclined in the range of 0.5 to 5 ° with respect to the mouth tip portion axis L1 passing through the center portion of the mouth tip portion 3. It is desirable that it is formed in.
The action and effect of the above-mentioned configuration of the mouthpiece 3 will be described later.

As shown in FIG. 2, the writing refill 5 includes an ink storage tube 5A that supports a ballpoint pen tip as the tip writing portion 5a, and a resin stopper 5B attached to the rear end of the ink storage tube 5A. There is.
Then, the tip portion of the ink accommodating tube 5A is formed to be thin so as to have an outer diameter dimension substantially the same as that of the tip writing portion 5a to form a small diameter portion 5b, and the diameter is increased from the small diameter portion 5b. It is integrally molded so as to be continuous with the large-diameter ink accommodating tube 5A via the enlarged diameter portion.

On the other hand, a coil-shaped return spring 7 is attached to the small diameter portion 5b of the writing refill 5. The front end of the return spring 7 is in contact with the annular spring receiving portion 3d (see FIG. 3) in the mouth tip 3, and the rear end of the return spring 7 is a writing refill as shown in FIG. The ink storage tube 5A of No. 5 is arranged in contact with the above-mentioned enlarged diameter portion. As a result, the return spring 7 urges the writing refill 5 in the retracting direction in the barrel 1.

As shown in FIG. 2, a cylindrical rear connecting body 8 having a male screw formed on the outer peripheral surface is screwed and attached to the rear end opening of the front shaft 1A, and the inner circumference of the rear connecting body 8 is formed. A female screw is formed on the surface. Then, the rear shaft 1B is linearly connected to the front shaft 1A by using the female screw of the rear connecting body 8.

That is, as shown in FIG. 4, the rear shaft 1B constitutes a thin-walled cylindrical portion 1a at the front end portion, and the male screw 1b formed on the outer periphery of the cylindrical portion 1a is attached to the rear connecting body 8 described above. By being screwed, it is connected to the front shaft 1A.
A long hole 1c is formed along the axial direction in the vicinity of the substantially central portion in the longitudinal direction of the rear shaft 1B, and the operation knob 13 attached to the operation cylinder 9 described later is formed along the long hole 1c. It is inserted so that it can move in the axial direction.

Further, the rear end portion of the rear shaft 1B is configured so that the outer diameter is reduced, and an annular locking portion 1d for locking the tip end portion of the rod 12, which will be described later, is formed inside the rear end portion. Further, in the central portion of the locking portion 1d formed in an annular shape, a funnel-shaped concave tapered surface 1e is formed, and a shaft hole communicating with the rear end portion of the rear shaft 1B following the tapered surface 1e. 1f is formed.
Further, in front of the annular locking portion 1d in the axial direction, a stepped contact portion 1g having a slightly smaller inner diameter toward the rear end portion is formed.
The actions of the locking portion 1d, the tapered surface 1e, the shaft hole 1f, and the contact portion 1g formed in the rear shaft 1B will be described later.

As shown in FIG. 2, the operation cylinder 9 is housed in the rear shaft 1B so as to be movable along the rear shaft 1B. The single item configuration of the operation cylinder 9 is shown in FIG. 5. The operation cylinder 9 is formed into a cylindrical shape, and a guide portion 9a having an opening 9b having an inner diameter smaller than the inner diameter of the operation cylinder 9 is provided at the rear end portion. , Is integrally formed with the operation cylinder 9.
A mounting hole 9c is formed on the side surface of the guide portion 9a, that is, the side surface of the rear end portion of the operation cylinder 9, to which the operation knob 13 described later is attached.

As shown in FIG. 2, a slide piece 10 to which the rod 12 is swingably attached by the lid 11 is housed in the operation cylinder 9 so as to be slidable in the axial direction of the operation cylinder 9. Then, the plug body 5B of the writing refill 5 is in contact with the front side (mouth portion 3 side) of the slide piece 10 by receiving the urging force of the spring 7.
As a result, the operating cylinder 9 and the rod 12 are also subjected to the urging force in the retracting direction by the spring 7 via the slide piece 10.

As shown in FIG. 6, the slide piece 10 constitutes a short-axis cylindrical body, and its outer peripheral surface is slidably supported along the inner peripheral surface of the operation cylinder 9. A circular space portion 10a is formed by being bored from the back surface side of the slide piece 10, and a dent having a diameter slightly larger than the inner diameter of the space portion 10a is formed along the opening edge of the space portion 10a. The portion 10b is formed in an annular shape so as to surround the opening edge.
Then, by closing the space portion 10a of the slide piece 10 and attaching the lid 11 to the slide piece 10, the rod 11 is attached to the slide piece 10 so that its legs can swing. It is attached.

That is, the lid 11 has a short-axis cylindrical portion 11a and a flange portion 11b formed at the end of the cylindrical portion 11a, as shown in FIG. 7 as a single item configuration. In addition, the inner diameter of the opening 11c formed inside the flange portion 11b is formed to be smaller than the inner diameter of the cylindrical portion 11a.
On the other hand, as shown in FIG. 8, the rod 12 is made of a linear metal material, has a head 12a having a large diameter at one end, and has a head 12a on the other end side of the head 12a. , A leg portion 12b having a tip portion formed into a substantially hemispherical shape is formed.

Then, the leg portion 12b of the rod 12 is inserted from the cylindrical portion 11a side of the lid body 11, and the head portion 12a of the rod 12 is positioned within the cylindrical portion 11a of the lid body 11, and the cylinder of the lid body 11 is formed. The portion 11a is press-fitted into the space portion 10a of the slide piece 10 described above.
As a result, the cylindrical portion 11a of the lid body 11 fits into the inner peripheral surface of the space portion 10a of the slide piece 10. Then, the flange portion 11b of the lid body 11 is attached so as to be located at the annular recessed portion 10b formed in the slide piece 10.

Therefore, the head portion 12a of the rod 12 is accommodated in the cylindrical portion 11a of the lid body 11 to prevent the rod 12 from falling off from the slide piece 10, and the rod 12 is provided with the opening 11c formed in the lid body 11 as a fulcrum. The legs 12b are attached so as to be swingable.
Then, as shown in FIG. 2, the mounting pin 12a of the operation knob 13 shown in FIG. 9 is mounted in the mounting hole 9c of the operation cylinder 9 housed in the rear shaft 1B via the elongated hole 1c of the rear shaft 1B. Be done. As a result, the operation cylinder 9 can move in the rear shaft 1B in the axial direction according to the movement operation of the operation knob 13 in the axial direction.

With respect to the ballpoint pen writing instruments shown in FIGS. 1 and 2 configured as described above, the operation of feeding and releasing the writing unit 5a from the mouthpiece 3 will be described mainly with reference to FIG.
As described above, FIG. 2A shows a feeding state of the writing unit 5a, and FIG. 2B shows a feeding release state of the writing unit 5a.

In the extended state of the writing portion 5a shown in FIG. 2B, the slide piece 10, the rod 12, and the operation cylinder 9 are retracted via the writing refill 5 by receiving the urging force of the return spring 7. To.
Due to the retreat of the writing refill 5, the writing portion 5a is accommodated in the mouth tip portion 3, and the operation knob 13 attached to the rear end of the operation cylinder 9 is similarly located in the retracted state.

When the operation knob 13 is moved forward in the extended state of the writing portion 5a shown in FIG. 2 (B), the writing refill 5 moves forward via the operation cylinder 9 and the slide piece 10, and the writing refill 5 moves forward while contracting the spring 7. The writing part 5a is drawn out from the mouth part 3. At this time, the leg portion 12a of the rod 12 attached to the slide piece 10 escapes from the shaft hole 1f of the rear shaft 1B, moves to the locking portion 1d side formed on the rear shaft 1B by gravity, and is locked. Axle.
Therefore, the retreat of the spring 7 in the written refill 5 due to the urging force is prevented. As a result, the writing unit 5a shown in FIG. 2B keeps the feeding state, and the pole pen writing tool is in a state where writing is possible.

When the operation knob 13 is moved backward in the extended state of the writing unit 5a shown in FIG. 2A, only the operation cylinder 9 is retracted in the axial direction. At this time, since the leg portion 12b of the rod 12 is locked to the locking portion 1d of the rear shaft 1B, the slide piece 10 and the writing refill 5 maintain the feeding state.
Then, when the operation knob 13 and the operation cylinder 9 are retracted by about 1 to 3 mm, a part of the opening 9b surrounding the rod 12 formed in the guide portion 9a formed at the rear end portion of the operation cylinder 9 is the rod. It touches 12. For this purpose, the hemispherical tip portion formed on the leg portion 12b of the rod 12 enters the funnel-shaped tapered surface 1e formed in the rear shaft 1B, and enters the locking portion 1d by the tip portion of the rod 12. Is unlocked.

Therefore, the leg portion 12b of the rod 12 is guided by the tapered surface 1e and enters the shaft hole 1f, and receives the urging force of the return spring 7, and the writing refill 5 retracts together with the slide piece 10 and the operation cylinder 9.
Then, the rear end portion of the operation cylinder 9 abuts on the stepped abutting portion 1g formed in the rear shaft 1B and having an inner diameter reduced toward the rear end portion, and the retracting position is regulated. It returns to the extended release state of the writing unit 5a shown in B).

According to the feeding release operation of the writing unit 5a described above, in the feeding state of the writing unit 5a shown in FIG. 2A, by giving a light operation of moving the operation knob 13 back by about 1 to 3 mm, the writing refill 5 and the writing refill 5 are combined. It is possible to provide a writing instrument having excellent operability, in which the slide piece 10, the operation cylinder 9, the operation knob 13, and the like are retracted by the urging force of the spring 7 and can be returned to the released state.

On the other hand, as described above, according to the mouthpiece 3 used in this writing tool, the opening axis L2 passing through the center of the opening 3a at the tip of the mouth is relative to the mouthpiece axis L1 passing through the center of the mouthpiece 3. Is formed in an inclined state in the range of 0.5 to 5 °.
According to this configuration, when the writing portion 5a of the writing refill 5 appears and disappears in the opening 3a of the mouth tip 3, the tip writing portion 5a having a columnar outer peripheral surface is the front contact portion 3e and the rear of the opening 3a. It can move in the axial direction while being lightly in contact with the side contact portion 3f.

As a result, in the movement of the writing portion 5a from the mouth portion 3, the sliding resistance of the writing portion 5a with respect to the mouth portion 3 can be reduced while reducing the rattling between the mouth portion 3 and the writing portion 5a. It is possible to contribute to providing a writing tool that can be expected to smoothly appear and disappear from the writing portion 5a from the mouth portion 3.

If the crossing angle of the opening axis L2 with respect to the mouth tip axis L1 is extremely small, the above-mentioned action and effect cannot be exhibited, and if the crossing angle is too large, the writing portion from the mouth portion 3 is rather There arises a problem that adversely affects the smooth haunting motion of 5a.

The embodiment described above is an example of a ballpoint pen writing instrument provided with a ballpoint pen tip as a writing unit, but the writing instrument according to the present invention is expected to have the same effect even if it is used for a writing instrument other than the ballpoint pen writing instrument. can do.

1 Shaft cylinder 1A Front shaft 1B Rear shaft 1c Long hole 1d Locking part 1e Tapered surface 1f Shaft hole 1g Contact part 3 Mouth tip (base)
3a Tip opening 3d Spring receiving part 3e Front contact part 3f Rear contact part 5 Writing refill 5A Ink storage tube 5B Plug body 5a Writing part (ballpoint pen tip)
7 Spring 9 Operation cylinder 9a Guide part 9b Opening 9c Mounting hole 10 Slide piece 10a Space part 11 Lid body 11a Cylindrical part 11c Opening 12 Rod 12a Head 12b Leg 13 Operation knob L1 Mouth tip axis L2 Opening axis

Claims (3)

A writing refill equipped with a writing part is housed in the shaft cylinder, and the writing part is extended from the mouth part at the front end of the shaft cylinder by advancing the writing refill, and the writing part is released from being housed in the mouth part by retracting the writing refill. A writing instrument that can be switched between states
Along with the writing refill, a spring that urges the slide piece to which the rod is swingably attached in the backward direction,
An operation cylinder arranged between the slide piece and the shaft cylinder to support the slide piece so as to be slidable in the axial direction and to be movable in the axial direction in the shaft cylinder.
An operation knob attached to the operation cylinder and arranged so as to be movable along the shaft cylinder is provided.
The tip of the swingable rod attached to the slide piece is formed in the shaft cylinder by the forward movement of the operation cylinder, the slide piece, and the writing refill accompanying the operation of the operation knob in the forward direction. A writing instrument characterized in that the writing portion is set to a feeding state by locking the locking portion. The operation cylinder is formed with a guide portion that surrounds the rod that is swingably attached to the slide piece.
By operating the operation knob in the retracting direction, the tip position of the rod is guided by the guide portion, thereby releasing the locking of the rod tip to the locking portion formed in the barrel. The writing tool according to claim 1. A contact portion that regulates the retracted position of the operating cylinder that receives the urging force of the spring is formed in the shaft cylinder as the tip of the rod releases the lock to the locking portion. The writing tool according to claim 2, which is characteristic.

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