JP3299653B2 - Capless writing instrument with drying prevention mechanism - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a capless writing implement having a ball-tip writing portion such as an aqueous ball-point pen, a gel pen, and an oil-based ball-point pen.

[0002]

2. Description of the Related Art Conventionally, a writing instrument having a writing portion formed of a ball tip and using a volatile liquid as ink has been made capless so that the operation is simplified without the need for attaching and detaching a cap at the time of use. From the writable state in which the writing unit is protruded from the writing implement main body, various structures have been proposed in which the writing unit is stored in the writing implement main body to prevent its drying.

[0003] For example, Japanese Patent Publication No. 5-68360 discloses a structure in which a lid is used to close an opening in which a writing portion appears and disappears to prevent drying. Specifically, a writing body having a tip writing portion and an air hole is movably accommodated in the writing instrument main body, and a sealing cylinder having an inner hole in which the writing section of the writing body appears and disappears is fixedly provided in the writing instrument main body. Further, a swingable seal lid for opening and closing the inner hole of the seal cylinder is provided. On the other hand, the writing body is advanced by knocking or rotating or the like to be locked in a writing state, and the locking or unlocking is released by knocking or rotating or the like to provide a forward and backward mechanism for storing the writing body. The body and the part that moves integrally are connected by a thread-like member, and as the cursive writing is retracted and stored, the thread-like member is pulled to close the seal lid. At that time, after the seal lid is closed, the thread-like member is tensed at the position where the writing portion has receded from the seal lid, and the cursive body is prevented from retreating. After is opened,
The curving member is configured to be able to move forward further by bending the thread-like member.

[0004]

However, the conventional capless writing implement as described above has a problem that when the writing body is stored, ink leakage easily occurs inside.

That is, the thread-like member for closing the seal lid is connected to the writing body or a portion that moves integrally with the writing body,
In order to securely close the seal lid, the cursive writing is set so that it will further retract after this seal lid closes the inner hole. Between the part and the closed seal lid,
There is a space on the mechanism that occurs until the thread-like member is tensioned. Therefore, the writing section, specifically, an aqueous ballpoint pen,
When a writing body having a writing part with a ball tip such as a gel pen or an oil-based ballpoint pen is accommodated in a seal cylinder, the surrounding space around the writing part is sealed, and then the writing part retreats in the space. As a result, ink oozes out from the tip of the writing portion and accumulates in a small amount at the tip. If this movement is repeated, ink may adhere to the periphery of the writing portion and good writing may not be performed unless the ink is wiped off.

[0006] In addition, a part of the conventional structure is modified so that an elastic body is provided on the back surface of the seal lid, and the tip of the writing part and the back surface of the seal lid are pressed against each other at the retreat position of the writing body, thereby making the writing part elastic. In some cases, the stop position of the writing body, the length of the thread member, and the like are set so that the body is directly sealed. However, when the cursive body is retracted to be in the writing state from the stowed state, the thread-like member is loosened with the forward movement of the cursive body, and the seal lid can be opened. In this case, the rear surface of the seal lid is pressed, and the seal lid is rubbed so as to be pushed open. This causes a problem that ink comes out and the rear surface of the seal lid and the writing portion are stained with the ink.

In view of the above circumstances, the present invention provides a cap having a dry-prevention mechanism that has a good sealing property of a writing portion with a ball chip and always obtains a good writing condition when the writing is enabled. It is an object of the present invention to provide a writing instrument.

[0008]

In order to achieve the above object, a capless writing instrument having a drying prevention mechanism according to the present invention is provided.
A writing part with a ball tip at the end of the pipe part has a writing body connected to an ink tank at the rear end of the pipe part, and the writing part is movably housed in the axial direction and the writing part can appear and disappear at the tip Writing instrument body having a secure opening and a locking portion for regulating the retreat position of the writing instrument, a first spring for urging the writing instrument in a retreating direction, and a tip of the writing instrument fixed in the writing instrument body. A seal cylinder having an inner hole through which a writing portion protrudes and retracts, and a tip writing portion of the writing body, which is swingably provided in the seal tube, opens and closes the inner hole of the seal tube, and is located near the opening of the inner hole. A sealing lid for sealing,
A sliding member movably disposed in the axial direction within the writing instrument main body, the sliding member being locked to the writing body at a position advanced by a predetermined amount from a rear end stop position, and integrally moving forward; And a thread-like member connecting the sliding member and the seal lid. The thread-like member is tensioned when the sliding member retreats to close the seal lid while sliding. The thread-like member is loosened and the seal lid is opened before the member is advanced by a predetermined amount from the retreat stop position and locked to the writing body, and thereafter the writing body is moved forward.

The sliding member has a rear end portion provided on a knock portion protruding from the writing instrument main body, a projection protruding in the axial direction is provided in the rear end portion of the sliding member, and the tip end of the projection is a writing body. Is preferably provided so as to face the rear end of the sliding member with a predetermined gap, and to contact the writing body and move forward integrally when the sliding member moves forward.

[0010]

In the capless writing instrument having the above-described drying prevention mechanism, when the writing instrument is stored in the writing instrument main body, the writing instrument contacts the locking portion, and then the tip writing section closes the seal lid. As a result, compared to the case where a closed space is formed around the tip of the writing section, there is no movement of the writing body, so there is no decompression state and ink leakage occurs inside the seal cylinder. When the writing body is moved forward to be in a writable state, no ink adheres around the writing portion and a good writing state can be maintained.

Further, when the writing portion in the housed state is moved forward to be in a writable state, the seal lid is opened first by an operation clearance provided between the sliding member and the writing body at the initial stage of the movement of the sliding member. After that, the writing body is moved forward and sent out, so even if the seal lid is crimped during storage, the writing part does not move forward while rubbing the seal lid,
The ink can be prevented from being scattered to the seal lid and peripheral parts, and a good writing state can be maintained.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a cross-sectional view showing the overall configuration of a capless writing instrument having a drying prevention mechanism according to an embodiment in a stored state, FIG. 2 is a cross-sectional view showing an initial state in which a writing state is operated, and FIG.
FIG. 2 is a sectional view of the same writable state.

Capless writing instrument 1 (knock-type writing instrument)
The writing body 3 and the knock sliding member 4 are slidably fitted in an axial direction inside a cylindrical writing instrument main body 2 (barrel). The writing instrument main body 2 is attached to the tip of the shaft part whose rear end is open,
A writing unit 7 described later has a front end opening 2a that can appear and disappear, and the writing implement main body 2 is provided with an engaging portion 2b that regulates a retreat position of the writing body 3 near an opening at a rear end.

In the writing body 3, a metal pipe 6 is connected to the tip of a cylindrical ink tank 5 having an open rear end. The tip of the pipe 6 is a writing section 7 made of a ball tip. Is formed, and an ink storage chamber 8 connected to the pipe section 6 is provided inside the ink tank section 5, and ink is supplied to the writing section 7. The rear end of the ink tank 5 is closed by fitting of the closing member 9. The writing body 3 is urged in a retreating direction by a first spring 11 contracted between the writing body 3 and a seal cylinder 15 described later.

The tubular knock sliding member 4 is disposed between the inside of the writing implement main body 2 and the outer periphery of the ink tank section 5 of the writing implement 3, and the rear end portion of the knock sliding body 4 is provided. A knocking portion 4a projecting from the rear end is formed on the inside of the knocking portion 4a.
Is provided. A second spring 14 for urging the knock sliding member 4 in the retreating direction is provided on the outer periphery of the projection 13.

Although not specifically shown, the knock sliding member 4 is engaged between the knock sliding member 4 and the writing instrument main body 2 at a position where the knock sliding member 4 is pushed in. A member for stopping and a releasing member for releasing the locking are provided.

A cylindrical seal cylinder 15 through which the tip writing portion 7 of the writing body 3 can be inserted is disposed inside the tip portion of the writing instrument main body 2. An annular projection (not shown) is provided in the inner hole of the seal cylinder 15 so as to be in close contact with and seal with the outer periphery of the pipe portion 6.
Are fitted and fixed to the inner peripheral surface of the. A seal lid 16 for opening and closing the inner hole 15a is swingably installed at the tip of the seal cylinder 15.

The sliding member 4 and the seal lid 1
When the knocking slide member 4 is moved backward by the second spring 14, the seal lid 16 is pressed against the inner hole 15 a of the seal cylinder 15 so that the inner
It is linked so that 5a may be closed.

The distal end of the projection 13 of the knock sliding member 4 is provided such that a gap of a predetermined amount is formed between the knock sliding member 4 and the rear end surface of the writing instrument main body 2 at the rearmost position. ing. The rear end stop position of the knock sliding member 4 is regulated by the tension of the thread member 18. At a position advanced by a predetermined amount from this state, the tip of the protrusion 13 is set so as to contact the rear end of the knocked writing body 3 and move forward integrally.

On the other hand, the knock writing body 3 is in the retracted position,
The tip writing portion 7 is provided so as to substantially face the opening position of the inner hole 15a, and the back surface thereof is pressed against and sealed with the writing portion 7 with the seal lid 16 closed.

The seal lid 16 is formed in an open shape and has a characteristic of returning from the closed state to the open direction. When the thread-like member 18 is assembled in the main body 2 and the thread-like member 18 is loosened, as shown in FIG. , To open the inner hole 15a of the seal cylinder 15.

The pressure contact surface of the seal lid 16 has a concave portion in contact with the writing portion 7 at the center portion, and this pressure contact portion has a slight flexibility so as to be in close contact with the seal cylinder 15 and the writing portion 7. It is provided in.

To explain the operation of the above embodiment, in the state where the tip writing portion 7 of the writing body 3 of FIG. 1 is stored inside the writing implement main body 2, the knock sliding member 4 and the writing implement main body 2 are in the first position.
And the tip writing portion 7 of the writing body 3 is placed in the retracted position by the urging force of the second springs 11 and 14.
The seal cover 16 is closed by being pulled by the thread-like member 18 to close the inner hole 15a of the seal cylinder 15, and is pressed against the tip of the writing portion 7 to seal it. The section 7 is sealed to prevent drying due to evaporation of the ink. In this state, the seal cover 1
By directly sealing the writing section 7 with 6,
Since there is no space around the writing section 7 and the occurrence of ink leakage is prevented, good writing performance can be obtained at the start of writing, which will be described later. In the retracted state as described above, the writing body 3 is stopped by its rear end abutting on the locking portion 2b of the writing implement main body 2, and a predetermined gap is formed between the writing body 3 and the tip of the projection 13 of the knock sliding member 4. Have been.

When the knocking operation is performed to push the knocking slide member 4 into the writing instrument main body 2 from the stored state, as shown in FIG.
Only the second member 14 moves forward against the second spring 14 and releases the tension of the thread-like member 18. The seal lid 16 is opened due to its molding characteristics.
The writing body 3 is stopped without advancing until the writing body 3 comes into contact with the rear end of the writing body 3, and the tip writing part 7 does not push open the seal lid 16 and also removes ink stains due to rubbing. Does not occur.

When the tip of the projection 13 of the knock sliding member 4 comes into contact with the rear end of the writing body 3, the writing body 3 moves forward integrally with the knock sliding member 4, and the writing portion 7 at the tip moves forward. Then, as shown in FIG. 3, it protrudes from the main body front end opening 2a, and becomes in a writable state.

When storing from the writable state,
By operating a release member (not shown), the knock sliding member 4 and the writing body 3 move the first and second springs 11 and 14.
The writing body 3 stops and the tip writing section 7
Is located at the opening position of the seal cylinder 15, the knock sliding member 4 further moves backward, closes the seal lid 16 by the tension of the thread-like member 18, and presses and seals the writing portion 7 and stops.

In the above embodiment, the mechanism for locking and releasing the knock sliding member 4 in the knocked state is not specifically shown, but these structures are conventionally known knock type or rotary type. Lock and release mechanism is applied.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing an overall configuration of a capless writing instrument having a drying prevention mechanism according to an embodiment of the present invention in a stored state.

FIG. 2 is a sectional view showing an initial stage of operation to a writable state.

FIG. 3 is the same sectional view in a writable state.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Writing implement 2 Writing implement main body 2a Opening 2b Locking part 3 Writing body 4 Knock sliding member 5 Ink tank part 6 Pipe part 7 Writing part 11 First spring 13 Projection 14 Second spring 15 Seal cylinder 15a Inner hole 16 Seal lid 18 Threaded member

──────────────────────────────────────────────────続 き Continued on the front page (56) References JP-A-6-49086 (JP, U) Patent 2579188 (JP, B2) (58) Fields investigated (Int. Cl. ⁷ , DB name) B43K 24/00 -24/08

Claims (2)

(57) [Claims] 1. A writing part having a ball tip at a tip of a pipe part, a writing body connected to an ink tank at a rear end of the pipe part, and the writing body housed movably in an axial direction. A writing instrument main body having an opening through which the writing section can protrude and retract, and a locking section for restricting a retreat position of the writing instrument, a first spring for urging the writing instrument in a retreating direction, and the writing instrument main body And a seal cylinder having an inner hole in which the tip writing portion of the writing body protrudes and retracts, and is provided swingably in the seal cylinder, and opens and closes the inner hole of the seal cylinder, near the opening of the inner hole. A seal lid for pressure-sealing the tip writing portion of the writing body positioned therein, and disposed in the writing instrument main body so as to be movable in the axial direction, and locked to the writing body at a position advanced by a predetermined amount from a rear end stop position. A sliding member that moves forward integrally with the A second spring for urging the member in a retreating direction; and a thread-like member connecting the sliding member and the seal lid, and closing the seal lid by tensioning the thread-like member when the sliding member retreats. On the other hand, a drying prevention mechanism characterized in that the thread member is loosened and the seal lid is opened until the sliding member is advanced by a predetermined amount from the retreat stop position and locked to the writing body, and then the writing body is moved forward. A capless writing instrument having a. 2. The sliding member has a rear end portion provided on a knock portion protruding from the writing instrument main body, a projection protruding in the axial direction is provided in a rear end portion of the sliding member, and a tip end of the projection is provided. The drying prevention mechanism according to claim 1, wherein the rear end of the writing body is opposed to the writing end with a predetermined gap, and when the sliding member moves forward by a predetermined amount, the sliding member contacts the writing body and moves forward integrally. Capless writing instrument.