JP2009056603A - Retractable writing implement - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a retractable writing implement having a lid member that opens and seals the airtight space when the nib is retracted linked with the retractable operation of the nib, wherein the writing implement with the nib and the outer barrel need to be in close contact with each other for the purpose of forming an airtight space when the nib is retracted, and since a writing implement with a pen nib is moved forward and backward by operation, airtightness is prevented from being not maintained by abrasion due to rubbing of members between a writing implement body and an outer barrel or an annular member interposed against the outer barrel or between the annular member and the outer barrel. <P>SOLUTION: In a retractable writing implement, the writing implement body 2 with a pen nib provided at the tip end is moved forward/backward by operation to project/retract the nib from an opening at the front end of an outer barrel, and a hermetically sealed space is formed during the retracted state of the nib by close contact of the lid member 13, the writing implement body 2, and the outer barrel 1, wherein the lid member 13 opens/seals the opening at the tip end of the outer barrel 1 through driving linked with the forward/backward movement of the writing implement body. In this retractable writing implement, there is arranged a lubricating liquid, fluid-tightly in the close-contact part with the outer barrel of the writing implement body. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  According to the present invention, a writing instrument main body having a pen tip at the tip is moved forward and backward by operation so that the pen tip protrudes from the opening at the front end of the outer tube, and the tip opening of the outer tube is driven in conjunction with the forward and backward movement. The lid member that opens and closes the pen, and the writing instrument body and the outer cylinder come into close contact with each other so that the pendant writing instrument forms a sealed space when the pen nib is immersed, and the tip of the outer cylinder is driven in conjunction with this forward and backward movement. The present invention relates to a retractable writing instrument that forms a sealed space in an immersive state of a pen tip by a lid member that opens and closes an opening, and an annular member that is in close contact with the writing instrument body and an outer cylinder.

In Patent Documents 1 and 2, a writing instrument body having a pen tip at the tip is moved forward and backward by operation so that the pen tip protrudes and is recessed from the opening at the front end of the outer tube, and the outer cylinder is driven in conjunction with the forward and backward movement. A retractable writing instrument is disclosed that forms a sealed space in the immersive state of the pen nib by a lid member that opens and closes the tip opening of the tip and an annular member that is in close contact with the writing instrument body and the outer cylinder.
JP 2005-246971 A JP 2005-193585 A

  In a retractable writing instrument that has a lid member that opens and closes the sealed space when the pen tip is retracted in conjunction with the pen tip movement, the writing instrument body with the pen tip is used to form a sealed space when the pen tip is retracted. And the outer cylinder must be in close contact with each other directly or through another member. However, since the writing instrument body including the pen tip moves back and forth by the operation, the annular member interposed between the outer tube or the outer tube, or the annular member and the outer tube are rubbed. Therefore, wear due to rubbing of the member occurs, and airtightness may not be maintained.

  According to the present invention, a writing instrument main body having a pen tip at the tip is moved forward and backward by operation so that the pen tip protrudes from the opening at the front end of the outer tube, and the tip opening of the outer tube is driven in conjunction with the forward and backward movement. In a retractable writing instrument that forms a sealed space in the immersion state of the pen tip by close contact with the lid member that opens and closes the writing instrument body and the outer cylinder, The main part is a retractable writing instrument in which lubricating liquid is arranged, and the writing instrument body provided with a pen tip at the tip is moved forward and backward by operation so that the pen tip protrudes from the opening at the front end of the outer cylinder and is interlocked with this forward and backward movement. A retractable writing instrument that forms a sealed space in the pendant immersion state by a lid member that opens and closes the tip opening of the outer cylinder by driving and an annular member that is in close contact with the writing instrument body and the outer cylinder. Te, and gist slide type writing instrument disposed lubricating liquid closely portion relative to the annular member and the writing instrument body and the outer cylinder.

  What has a low friction coefficient in the sliding contact state of the writing instrument main body and the annular member interposed between the outer cylinder or the outer cylinder, or the lubricating liquid interposed between the annular member and the outer cylinder The wear of the member can be suppressed, and the airtightness can be maintained. In addition, even if a gap is generated due to an error in the dimensions of the member, the liquid itself can suppress the passage of gas, so that the airtightness is not hindered. Furthermore, since the lubrication effect is exhibited, the sliding contact is unlikely to become a load load with respect to the longitudinal movement of the writing instrument body, and the pen tip can be moved up and down with a light operation.

  The writing instrument body is a member that has a pen tip at the tip and contains ink therein. As the nib, a ballpoint pen, a fiber converging body, a porous body such as urethane, or a synthetic resin nib having a communication hole can be used as appropriate. In addition, the ink may be stored in a free state directly in the main body without penetrating into an ink storage body such as a fiber converging body or using an ink storage body. As for the ink used, dyes and / or pigments can be used as colorants, and water and organic solvents can be used as appropriate as the main medium.

  For the operation of moving the writing instrument body, various known methods such as a knock member arranged at the rear end of the retractable writing instrument and a slide mechanism on the side part can be adopted. Further, an elastic member such as a coil spring can be arranged between the members to help drive by operation and to seal the lid member.

The lid member that opens and closes the distal end opening of the outer cylinder is driven in conjunction with the movement of the writing instrument body. That is, when the writing instrument main body moves forward, the tip opening of the outer cylinder is opened to allow the pen tip to protrude, and the tip opening of the outer cylinder is closed while the writing instrument main body is retracted and accommodated in the outer cylinder. .
The drive of the lid member may be a door that opens outward or inward by a hinge, or may be opened and closed in a shutter manner by rotating around the central portion of the member. In any case, when the structure is sealed from the inside of the outer cylinder in contact with the inner edge of the outer cylinder, when the internal pressure in the outer cylinder or in the sealed space increases with the lid closed due to temperature changes, etc. This also prevents the lid member from opening unexpectedly. Further, if the member rotates around the central portion of the member, the radius of rotation can be minimized, which is convenient when the writing instrument itself is thin.

The lubricating liquid may have a freezing point of −22 ° C. or lower, a boiling point of 145 ° C. or higher, and a viscosity of 10 to 5000000 mPa · s (20 ° C.). Synthetic lubricating oil, mineral oil, glycerin, linoleic acid, Examples include vegetable oils such as soybean oil, rapeseed oil, corn oil, safflower oil, rice oil, cottonseed oil, sesame oil, peanut oil, olive oil, and palm oil composed of unsaturated fatty acids such as linolenic acid and oleic acid and various saturated fatty acids. Synthetic lubricating oils include hydrocarbon synthetic lubricating oils such as α-olefin (poly-α-olefin), polybutene (polyisobutylene), alkylbenzene, diester (dibasic acid ester), polyol ester (hindered ester), etc. Fatty acid ester synthetic lubricants, silicone oils, silicate esters, silanes and other silicone synthetic lubricants Fluorine-based synthetic lubricating oils such as oil, chlorofluorocarbon, perfluoropolyether, and fluoroester, phenyl ether, and phosphate ester. These can be used alone or in combination.
In particular, as in the present invention, the intimate part that is in contact with the sealed space and is formed of a writing instrument body, an outer cylinder, and an annular member made of synthetic resin, rubber, elastomer, etc. is chemically resistant to solvents such as ink. Straight silicone oils such as polydimethylsiloxane, polymethylhydrogensiloxane, polymethylphenylsiloxane, and cyclic dimethylsiloxane that have stable, releasable and non-adhesive properties, have low surface tension and are easy to spread on the surface of materials. Or side chain and / or both ends modified with organic groups, amino modification, epoxy modification, carbinol modification, mercapto modification, carboxyl modification, methacryl modification, polyether modification, phenol modification, silanol modification, aralkyl modification, fluoroalkyl Modified, long chain alkyl modified higher fatty acid ester modified, higher fatty acid Modified silicone oils such as have is preferably used. Also,
Straight silicone oils such as polydimethylsiloxane, polymethylhydrogensiloxane, polymethylphenylsiloxane, and cyclic dimethylsiloxane are less susceptible to environmental changes and the like because their viscosity changes with temperature are small.

An example is shown in FIG.
A writing instrument body 2 is accommodated in the outer cylinder 1. The writing instrument body 2 has an occlusion body 3 in which a coating solution is occluded. A pen tip 4 is provided at the tip of the writing instrument body 2.
The spring receiver 5 is disposed on the outer periphery of the tip of the writing instrument body 2.
The writing instrument body 2 is urged rearward by an elastic force of a coil spring 6 disposed between the shoulder 2 a of the writing instrument body 2 and the spring receiver 5.
Further, a locking projection 7 and a release projection 8 are formed at the rear of the writing instrument body 2, and a clip 9 is attached to the rear of the outer cylinder 1. A member 10 is attached. The gear member 10 can be fitted into the writing instrument body 2 locking projection 7 through a hole 11 formed in the side wall of the outer cylinder 1. When the rear end of the writing instrument body 2 is pressed, the writing instrument body 2 moves forward, and the pen tip 4 projects from the tip opening 1 a of the outer cylinder 1. At this time, the locking projection 7 formed on the writing instrument body 2 and the gear member 10 are locked, and the pen tip 4 is kept in the protruding and protruding state. When the rear end of the writing instrument main body 2 is pressed again, the writing instrument main body 2 further advances, so that the release protrusion 8 formed on the writing instrument main body 2 comes into contact with the gear member 10 and pushes it up. The locked state with the gear member 10 is released. When the locked state is released, the writing instrument body 2 is retracted by the elastic force of the coil spring 6, and the pen tip 4 is in an immersive state.
Both the outer cylinder 1 and the writing instrument main body 2 are made of polypropylene, the occlusion body 3 is a convergent body of polyester synthetic fiber coated with a polypropylene film, and the nib 4 is formed by solidifying the convergent body of polyester fiber with polyurethane resin. The tip is polished to a knife cut shape

  A butyl rubber O-ring 12 is disposed on the inner tip side of the outer cylinder 1. A lid member 13 is disposed behind the O-ring 12. The lid member 13 is urged forward by indirectly receiving the elastic force of the coil spring 6 via the spring receiving member 5 and is in close contact with the O-ring 12. The lid member 13 is in contact with a protrusion (not shown) formed on the writing instrument body 2 when the writing instrument body 2 moves forward, and rotates as the writing tool body 2 moves forward to open the distal end of the outer cylinder 1. Open the part 1a. When the writing instrument body 2 is retracted, the spring receiver 5 biased forward by the coil spring 6 is brought into contact with an outer protrusion (not shown) of the lid member 13 so that the lid member 13 is opened in the opposite direction. To return to the closed state.

A projection 14 is formed on the outer periphery of the intermediate part of the writing instrument body 2. The protrusion 14 and the outer cylinder 1 are closely in a circumferential shape.
The pen tip 4 inserted at the tip of the writing instrument body 2 disposed in the outer cylinder 1 is not dried due to the close contact between the lid member 13 and the O-ring 12 and the close contact between the projection 14 and the outer cylinder 1. In addition, it is shielded from the outside air and forms a sealed space in the pen tip immersion state.
The protrusion 14 moves while being rubbed against the inner wall of the outer cylinder 1 by the movement of the writing instrument body 2 in and out. The surface of the protrusion 14 is coated with polydimethylsiloxane having a freezing point of −50 ° C. or less, a boiling point of 200 ° C., and a viscosity of 10,000 mPa · s (20 ° C.) as a lubricating liquid. Achieves a low coefficient of friction.

FIG. 2 shows another example.
In this example, the sealed space in the immersive state of the pen tip is made smaller, and the drying of the ink in the pen dip state is suppressed. Hereinafter, differences from the above-described example will be described.
An annular member 15 made of butyl rubber is disposed on the outer periphery of the distal end portion of the writing instrument body 2 so as to be in sliding contact with the outer cylinder 1 and the writing instrument body 2. The close space between the lid member 13 and the O-ring 12, the close contact between the annular member 15 and the writing instrument main body 2, and the close contact between the annular member 15 and the outer cylinder 1 form a sealed space when the pen tip 4 is immersed. . By installing the annular member 15 at a relatively distal end portion of the writing instrument body 2, the volume of the sealed space can be reduced.
By the operation of the writing instrument body 2, the writing instrument body 2 moves while rubbing against the annular member 15. The surface of the annular member 13 is coated with polydimethylsiloxane having a freezing point of −50 ° C. or less, a boiling point of 200 ° C., and a viscosity of 10,000 mPa · s (20 ° C.) as a lubricating liquid. With a low coefficient of friction.

Using the form used in the invention shown in FIG. 2, a sample coated with various lubricating liquids was used as a sample after the pen tip retracting operation was performed 1000 times.

(Aging loss test)
The weight of the sample was measured before and after leaving the sample in an environment of 50 ° C. and 30% for 30 days, and the ratio with respect to the ink filling weight was expressed as a percentage as a reduced (evaporated) ratio. If it was 5% or less, it was judged that it could withstand long-term use.

(Pen tip in / out operation load)
The maximum load until the sample writing instrument body was raised and lowered and locked was measured.

The longitudinal cross-sectional view which shows an example. The longitudinal cross-sectional view which shows another example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Outer cylinder 1a Tip opening part 2 Writing instrument main body 2a Shoulder part 3 Oscillator 4 Pen tip 5 Spring receiver 6 Coil spring 7 Protrusion for latching protrusion 8 Protrusion clip for releasing 9 Clip gear member 10 Gear member O-ring 11 Hole cover Member 12 O-ring protrusion 13 lid member annular member 14 protrusion 15 annular member

Claims (4)

A writing instrument body having a pen tip at the tip is moved forward and backward by operation so that the pen tip protrudes from the opening at the front end of the outer cylinder, and the tip opening of the outer cylinder is opened and closed by driving in conjunction with the forward and backward movement. In the retractable writing instrument that forms a sealed space in the pen tip immersion state by bringing the lid member, the writing instrument main body, and the outer cylinder into close contact, a liquid-tight lubricating liquid is applied to the intimate portion of the writing instrument main body with respect to the outer cylinder. Placed writing tool. A writing instrument body having a pen tip at the tip is moved forward and backward by operation so that the pen tip protrudes from the opening at the front end of the outer cylinder, and the tip opening of the outer cylinder is opened and closed by driving in conjunction with the forward and backward movement. In the retractable writing instrument that forms a sealed space in the immersion state of the pen tip by the lid member and the annular member that is in close contact with the writing instrument body and the outer cylinder, lubricating liquid is applied to the intimate part of the annular member, the writing instrument body, and the outer cylinder. Placed writing tool. The retractable writing instrument according to claim 1 or 2, wherein the lid member is rotationally driven to open and close the distal end opening of the outer cylinder. The retractable writing instrument according to any one of claims 1 to 3, wherein the lubricant has a freezing point of -22 ° C or lower, a boiling point of 145 ° C or higher, and a viscosity of 10 to 5000000 mPa · s (20 ° C).