JP2011042082A - Capless writing utensil - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a capless writing utensil which has a pen point desiccation checking mechanism and prevents a foreign substance such as dust from intruding through an apex opening. <P>SOLUTION: The operation of this capless writing utensil is as follows: a support is arranged at the apex side part of a barrel 2 and an apex opening is opened and closed by the rotation of an inner cap 5 installed inside the apex interior of the barrel as supported by the support. In addition, the inner cap has a protrusion and is resiliently urged in one direction of rotation by a return spring 7, so that the inner cap normally blocks the apex opening. Besides, the inner cap rotates, repulsing the resilient force of the return spring 7, following the actuation of the protrusion to be pressed to the apex of the writing utensil, and as a result, the apex opening of the barrel is opened. Thus, a pen-point can be protruded. Further, with removal of the pressing action applied to the protrusion part of the inner cap by the apex of a writing element, the inner cap makes a reverse rotation by the resilient force of the return spring 7, and blocks the apex opening, forming an airtight space inside the barrel. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a retractable writing instrument, and more particularly to a capless writing instrument having a nib drying prevention mechanism.

  Conventionally, in writing instruments such as water-based or oil-based marking pens and fountain pens, a cap for sealing the tip is used to prevent the ink at the tip of the writing part from drying out and becoming impossible to write. What is provided is generally used. In addition, in the case of a writing instrument having a cap as described above, it is necessary to attach and detach the cap every time it is used, which is troublesome, so a separate cap is unnecessary, so-called Many capless writing instruments have been proposed.

  For example, in the retractable writing instrument disclosed in Japanese Patent Application Laid-Open No. 2005-22138, an inner cap formed of a rubber material or an elastic resin material is provided at the tip opening of the shaft cylinder, and a slit is formed at the center of the inner cap. Thus, the pen tip of the cursive body can be freely inserted and removed, and when not in use, the inner cap is closed and the tip opening is closed to prevent the pen tip from drying.

  In addition, in the retractable writing instrument disclosed in Japanese Patent Application Laid-Open No. 2005-246971, a ball-shaped door that opens and closes the tip opening of the shaft cylinder linked to the writing body is provided, and the ball-shaped door rotates when the pen tip is recessed from the tip opening. Thus, the outer peripheral surface of the ball-shaped door slides on the inner surface of the tip opening, thereby closing the tip opening.

However, in the retractable writing instrument disclosed in Japanese Patent Application Laid-Open No. 2005-22138, since the pen tip portion directly presses against the slit portion, there is a risk of plastic deformation or elastic deformation of the slit portion due to frequent use. There is a risk that efficiency will be reduced and confidentiality may be reduced.
In addition, due to the mechanism, the internal space of the tip opening is widened, and foreign matters such as dust from the opening are likely to enter, and the confidentiality may be further lowered.

Further, in the retractable writing instrument disclosed in Japanese Patent Application Laid-Open No. 2005-246971, the ball-shaped door is pressed by a spring, so that when a force against the spring is applied from the tip opening side, the inner surface of the tip opening and the ball There is a possibility that a gap is formed on the sliding surface of the door, and foreign matters such as dust are likely to enter and the sealed state cannot be maintained.
In addition, there is a drawback that the number of parts is increased due to the mechanism and the cost is increased.

  The present invention has been made in order to solve the above-described problem. In a capless writing instrument in which a writing body is disposed in a shaft cylinder, and a pen tip portion of the writing body is configured to be able to protrude and retract from a tip opening of the shaft cylinder. A support portion is provided on the tip side of the shaft tube, and an inner cap provided inside the tip of the shaft tube is supported by the support portion and rotates to open and close the tip opening. The inner cap is provided with a protrusion, and the inner cap is elastically biased in one direction by a return spring and normally closes the opening of the tip. The inner cap rotates while being repelled by the spring of the return spring, and the tip opening of the shaft cylinder is opened, so that the pen tip can be projected. Furthermore, when the protrusion of the inner cap is released from the pressing of the tip of the cursive body, the inner cap rotates backward by the spring of the return spring to close the opening of the tip and prevent foreign matter such as dust from entering. A capless writing instrument in which a sealed space is formed inside the shaft cylinder by tightly sliding the inner surface of the shaft cylinder and the outer surface of the writing body.

In the following (1) to (9), specific examples of means of parts and parts will be described.
(1) The inner cap has a partial shape of a hollow sphere, and the inner cap has bearings on both sides of the hollow sphere through which a straight line passing through the centripetal point of the hollow sphere penetrates. A capless writing instrument that is freely pivotable based on and closes and slides on the inner surface of the tip of the shaft tube to open and close the tip opening.
(2) The support portion on the tip side portion of the shaft tube has a fixed shaft on both tip side portions of the shaft tube through which a straight line perpendicular to the shaft center of the shaft tube passes, and the fixed shaft serves as the support shaft. Capless writing instrument that supports both inner cap bearings and allows the inner cap to rotate.
(3) The return spring is a loop-shaped spring centered on the inner cap bearing, and elastically biases the rotation direction of the inner cap in one direction, and one end of the return spring is fitted to the inner cap side. Capless writing instrument that is stopped and the other end is fitted inside the tip of the barrel.
(4) A capless writing instrument in which the inner cap, which is elastically urged in one direction of rotation by the return spring, is provided with a stopper on the inner side of the end of the shaft cylinder for normally maintaining the end opening closed.
(5) The protrusion is attached to the inner cap as a slide pin. The slide pin is inserted and held in a guide hole provided in the inner cap so that the guide hole can be freely moved, and slides when the rear end of the slide pin is pressed. A capless writing instrument in which the inner cap rotates based on the support shaft while the tip of the pin is in contact with the inner surface of the tip of the shaft cylinder.
(6) When the inner cap rotates and the tip opening is completely opened, the tip of the slide pin fits into the locking recess provided inside the tip of the shaft tube, and the slide pin is locked. Capless writing instrument that stops the rotation of the inner cap that holds the slide pin.
(7) The front end of the cursive body is provided with a locking portion that presses the slide pin, and when the front end of the slide pin fits into the locking recess, the rear end of the slide pin comes off the locking portion and the front end of the cursive body Capless writing instrument that keeps the inner cap fully open at the tip opening, in contact with the side surface of the part.
(8) Since the outer peripheral surface of the inner cap that opens and closes the front end opening and the inner end surface of the shaft cylinder are in close contact with each other, both the outer peripheral surface of the inner cap and the inner side surface of the front end opening or either one of the surfaces A capless writing instrument in which an air-tight treatment is applied to both the inner side surface of the shaft cylinder and the outer side surface of the writing body which are in close contact with each other and / or the outer surface of the writing body.
(9) A capless writing instrument in which an O-ring is attached to the inner side surface of the tip of the shaft cylinder around the opening of the tip, and an O-ring is attached around the outer surface of the writing body.

  The effect of preventing volatilization and drying of the nib is high, and foreign matter such as dust can be prevented from entering from the opening of the tip.

Exploded view of the present invention Enlarged sectional view showing the non-use state of the present invention Enlarged sectional view of the O-ring when not in use , , , In the partial sectional view from the non-use state of the present invention to the use state, (a) is a left side view, (b) is a front view, and (c) is a right side view.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
As shown in FIGS. 1, 2, and 3, the configuration of the capless writing instrument 1 includes a shaft cylinder 2, a writing body 8, a locking cap 9, a push spring 10, and an inner cap 5 that is accommodated in the shaft cylinder tip 3. The support shaft 4, the return spring 7, the slide pin 6, and the O-rings 11 and 12 are roughly classified.
In the event of writing a front-rear direction relationship as the movement direction of the cursive body 8 with respect to the barrel 2 in the sentence, the forward direction means the cursive body 8 nib direction, and the backward direction means the direction opposite to the nib direction. .

  First, the detailed configuration of the embodiment will be described. The inner cap 5 has a partial shape of a hollow sphere, and is composed of both bearing portions 5b and 5c and a shutter portion 5a, and a straight line passing through the center of the hollow sphere is formed. Bearing holes 5d and 5e are formed on both sides of the hollow sphere at the center of both bearing portions 5b and 5c.

  Each shaft fixed to both shaft fixing holes 3a and 3b through which a straight line perpendicular to the axis of the shaft tube 2 passes through the side of the shaft tube tip 3 serves as a support shaft 4, and both bearing holes 5d and 5e of the inner cap The inner cap 5 is rotatable and opens and closes the tip opening 3e.

  The return spring 7 has a circular shape and is provided on the outer surface of the bearing portion 5c with the bearing hole 5e of the bearing portion 5c as a central position, and the inner cap 5 is repulsively biased in one direction of rotation. One end of 7 is fitted in the spring locking hole 3g of the shaft tip 3, and the other end is fitted in the spring locking hole 5g of the bearing portion 5c.

  The slide pin 6 is movably held in a guide hole 5f provided in parallel with the bearing hole 5d of the bearing portion 5b, and the tip of the slide pin 6 is in contact with the inner surface of the shaft barrel tip 3 so that the slide pin 6 When the rear end is pressed against the pin pressing surface 8g of the tip 8m of the cursive body 8, the inner cap 5 rotates.

  At the position where the shutter portion 5a of the inner cap 5 completely opens the tip opening 3e, the tip of the slide pin 6 fits into the locking recess 3c of the inner surface 3f of the shaft tip 3, and the rear end of the slide pin 6 is The shutter portion 5a is released from the pin pressing surface 8g and abutted and locked to the cursive tip portion 8c to keep the tip opening 3e open.

The shaft tube 2 is an integral type with the shaft tube tip 3 as a tip portion, and when the inner cap 5 rotates, the outer peripheral surface 5h of the shutter portion 5a slides in close contact with the inner surface 3f of the shaft tube tip 3.
A push spring 10 and a cursive body 8 are inserted into the shaft cylinder 2, and a cap screw 9b of the locking cap 9 and a set screw 2i of the shaft cylinder 2 are fitted, and one end of the press spring 10 is connected to the shaft cylinder 2. The other end abuts against the spring engaging portion 8j of the writing body 8, and the engaging step portion 8e of the writing body 8 contacts the engaging surface 9d of the engaging cap 9. The cursive body 8 is urged and locked backward by the spring of the push spring 10.
Further, the guide protrusion 8f of the writing body 8 is fitted in the guide groove 2j of the shaft tube 2, and the guide protrusion 8f slides along the guide groove 2j so that the writing body 8 advances straight back and forth.
When the writing body 8 is in the forward completion position, the locking projection 8i2 which is the end of the elastic body 8i1 of the writing body 8 is fitted into the locking hole 2h of the shaft cylinder 2, and the writing body 8 is locked.

  First, as shown in FIG. 2 or FIG. 3, the writing body 8 is urged rearward by the spring of the pressing spring 10, and the knock portion 8d of the writing body 8 protrudes from the cap hole 9a. 4 to 7 are partial cross-sectional views from the non-use state to the use state. As shown in FIG. 4, due to the spring of the return spring 7, the shutter portion 5a of the inner cap 5 is biased and locked by the shutter stopper 3d. The tip opening 3e of the shaft cylinder 2 is kept closed.

   When the knock surface 8l of the knock portion 8d is pushed, the cursive body 8 moves forward while repelling the push spring 10, and the pin pressing surface 8g is slid and held by the inner cap 5 as shown in FIG. By pushing the end, the inner cap 5 rotates in a direction to open the tip opening 3e while repelling the return spring 7 based on the support shaft 4.

   When the knock surface 8d is further pressed, the shutter portion 5a opens the tip opening 3e of the shaft tube 2 and the tip of the slide pin 6 fits into the locking recess 3c of the inner surface 3f of the shaft tip 3 as shown in FIG. The rear end of the slide pin 6 is released from the pin pressing surface 8g of the cursive body 8 and is in contact with and locked to the side surface of the cursive tip 8c, and the inner cap 5 is retained and is opened as shown in FIG. The pen tip 8m protrudes from the tip opening 3e.

  Further, the protruding system stop portion 2g of the shaft cylinder 2 and the protruding locking portion 8k of the writing body 8 come into contact with each other, and the writing body 8 is forwardly locked, and at the same time, it is in contact with and repels the rear inner surface 2a of the shaft cylinder 2. The locking projection 8i2 provided at the end of the elastic body 8i1 provided on the writing body 8 is fitted in the locking hole 2h of the shaft cylinder 2, so that the writing can be performed even if the pressing of the knock surface 8l is released. The body 8 is kept locked and the capless writing instrument 1 can be used.

  The operation and operation until returning from the use state to the non-use state will be described. When the locking projection 8i2 of the writing body 8 fitted in the locking hole 2h of the shaft tube 2 is pushed in, the locking projection 8i2 is inserted from the locking hole 2h. The writing body 8 is instantaneously retracted due to the release of the push spring 10 and the pen tip 8h is immersed from the tip opening 3e so that the locking step 8e of the writing body 8 contacts the locking surface 9d of the locking cap 9. The cursive body 8 is locked by contact.

  At the same time, the rear end of the slide pin 6 is released from the pin pressing surface 8g, and the inner cap 5 starts to reversely rotate due to the repulsion of the return spring 7, and the tip of the slide pin 6 is locked to the inner surface of the shaft tip 8 The shutter portion 5a is engaged with a shutter stopper 3d provided on the inner surface 3f of the shaft barrel tip 3 at a position where the inner cap 5 is reversely rotated and the outer peripheral surface 5h of the shutter portion 5a completely closes the tip opening. In addition, the space around the nib is hermetically sealed because the central part 2b in the cylinder and the middle part 8b of the writing body always slide in close contact with each other.

  The air supply / exhaust hole 2e of the shaft cylinder 2 makes the operation of the writing body 2 smooth by always maintaining the internal air pressure of the central part 2b in the shaft cylinder at the external pressure when the writing body 2 moves back and forth.

1 Capless writing instrument
2-shaft cylinder
2a Rear inner surface
2b Shaft cylinder inside
2c Shaft cylinder tip guide
2e Air supply / exhaust hole
2f Spring locking part
2g Projection locking part
2h Locking hole
2i Set screw
2j Guide groove
3 Axle tip
3a Shaft fixing hole
3b Shaft fixing hole
3c Locking recess
3d shutter stopper
3e Tip opening
3f Inside surface
3g Spring locking hole
4 Support shaft
5 Inner cap
5a Shutter section
5b Bearing part
5c Bearing
5d bearing hole
5e Bearing hole
5f Guide hole
5g Spring locking hole
5h Outer surface
6 Slide pin
7 Return spring
8 cursive
8a Cursive back
8b Cursive middle part
8c Cursive tip
8d knock part
8e Locking step
8f Guide protrusion
8g Pin pressing surface
8h nib
8i1 elastic body
8i2 Locking protrusion
8j Spring locking part
8k protrusion locking part
8l knock surface
9 Locking cap
9a Cap hole
9b Cap screw
9c clip
9d Locking surface
10 Pressing spring
11 O-ring
12 O-ring

Claims (10)

  In a capless writing instrument in which a writing body is arranged in a shaft cylinder, and a pen tip portion of the writing body is configured to be able to protrude and retract from a tip opening of the shaft cylinder, a support portion is provided on a tip side portion of the shaft cylinder, The inner cap provided inside the distal end is supported by the support portion and rotates and closes and slides on the inner side surface of the distal end of the shaft tube to open and close the distal end opening. The inner cap is provided with a protrusion. In addition, the inner cap is elastically biased in one direction of rotation by a return spring and normally closes the tip opening, and the inner cap is Rotating while repelling the spring of the return spring, the tip opening of the shaft cylinder is opened, the pen tip portion can be projected, and the protrusion of the inner cap is released from the pressing of the tip portion of the cursive body The inner cap is a return spring Reverse rotation by bullets closes the opening of the tip to prevent entry of dust and other foreign materials, and the inner surface of the shaft tube and the outer surface of the writing body slide closely to each other, and a sealed space is formed inside the shaft tube. Capless writing instrument, characterized in that can be formed.   The inner cap has a partial shape of a hollow sphere, and the inner cap has bearings on both sides of the hollow sphere through which a straight line passing through the centripetal point of the hollow sphere passes, and the inner cap is rotated based on both the bearings. 2. The capless writing instrument according to claim 1, wherein the capless writing instrument is movable and closes and slides on an inner surface of a tip of the shaft tube to open and close the tip opening.   The support portion at the tip side of the shaft tube has a fixed shaft at both tip side portions of the shaft tube through which a straight line perpendicular to the shaft center of the shaft tube passes, and both the inner caps with the fixed shaft as a support shaft. 2. The capless writing instrument according to claim 1, wherein the capless writing instrument supports the bearing and the inner cap is rotatable.   The return spring is a loop-shaped spring centered on the bearing of the inner cap, and elastically biases the rotation direction of the inner cap in one direction, and one end of the return spring is fitted to the inner cap side, 2. The capless writing instrument according to claim 1, wherein the other end is fitted inside the tip of the shaft tube.   The inner cap, which is elastically biased in one direction of rotation by the return spring, is provided with a locking portion on the inner side of the tip end of the shaft tube for normally closing the tip opening. The capless writing instrument according to claim 1.   The protrusion is attached to the inner cap as a slide pin, and the slide pin is inserted and held in a guide hole provided in the inner cap to freely move the guide hole. When the rear end of the slide pin is pressed, the tip of the slide pin 2. The capless writing instrument according to claim 1, wherein the inner cap rotates based on the support shaft while abutting against the inner surface of the tip end of the shaft cylinder.   When the inner cap rotates and the tip opening is completely opened, the tip of the slide pin fits into a locking recess provided inside the tip of the shaft tube, and the slide pin is locked to slide the slide pin. 2. The capless writing instrument according to claim 1, wherein the rotation of the inner cap holding is stopped.   The front end of the cursive body is provided with a locking portion that presses the slide pin, and when the front end of the slide pin fits into the locking recess, the rear end of the slide pin comes off the locking portion and the side surface of the front end of the cursive body 2. The capless writing instrument according to claim 1, wherein the inner cap maintains a state in which the front end opening is completely opened.   Since the outer peripheral surface of the inner cap that opens and closes the tip opening and the inner surface of the tip end of the shaft cylinder are in close contact with each other, both the outer peripheral surface of the inner cap and the inner surface of the tip opening or either one of them is hermetically sealed. 2. An airtight treatment is applied to both or either one of the inner side surface of the shaft cylinder and the outer side surface of the cursive body that are in close contact with each other and sliding. Capless writing instrument.   2. The capless writing instrument according to claim 1, wherein an O-ring is attached to the inner side surface of the tip of the shaft cylinder around the opening of the tip, and an O-ring is attached to the periphery of the outer surface of the writing body.

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