JPH0539988U - Liquid writing instrument - Google Patents

Abstract

(57) [Abstract] [Purpose] To prevent excessive outflow of ink when the valve is opened, and to eliminate the wasted space in the barrel to reduce the diameter of the barrel as a whole. [Structure] The annular seal member 9 is fixed to the inner wall of the barrel tip portion 21. The annular seal member 9 is in close contact with the rear peripheral surface of the pen body 8. The pen body 8 is made of fiber and also functions as a liquid absorbing member. Further, the annular seal member 9 and the valve seat 5 are integrally formed.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a liquid writing instrument. More specifically, a liquid type of a type that supplies ink from the ink storage portion to the pen body by pressing the pen body slidably held in the axial cylinder tip portion rearward to operate the valve mechanism. Regarding writing instruments.

[0002]

[Prior Art]

 Conventionally, in this type of writing instrument, an ink retaining space is provided between the rear portion of the pen body and the valve seat, and the peripheral surface of the rear portion of the pen body is surrounded by a liquid-absorbing member such as an annular sponge (for example, the actual opening). No. 60-26881) and a configuration in which a piston portion is formed in the rear portion of the pen body and slides on the inner wall of the barrel (for example, Japanese Utility Model Laid-Open No. 2-78384).

[0003]

[Problems to be solved by the device]

 In the writing instrument represented by the conventional Japanese Utility Model Laid-Open No. 60-26881, a liquid absorbing member such as a sponge is arranged on the front side of the valve seat, and even if it is surely possible to prevent the excessive outflow of the ink, the ink is absorbed inside the barrel. Since the space for accommodating the liquid member and the like is required, the entire diameter of the barrel is large, and it cannot be applied to the barrel of small diameter.

Further, in the writing instrument represented by Japanese Utility Model Laid-Open No. 2-78384, the inner wall of the cylinder part on which the piston part slides must be accurately finished to have a smooth surface, so that the sliding part is completely liquid-tight. It was difficult to do so, and the manufacturing cost was high.

The present invention is intended to solve the above-mentioned conventional problems. In addition to preventing excessive ink outflow and enabling smooth ink outflow, there is a wasted space in the tip of the barrel. It is an object of the present invention to provide a liquid writing instrument having a simple structure, which is optimal for a small-diameter shaft cylinder and has a simple structure.

[0006]

[Means for solving problems]

 The liquid writing instrument 1 according to the present invention operates the valve mechanism 3 by pushing the pen body 8 held slidably in the axial direction on the barrel tip portion 21 to operate the valve mechanism 3 to cause the pen body 8 to store the ink. 24 is a liquid-type writing instrument of the type that supplies ink, wherein an annular seal member 9 made of a non-porous elastic body is fixed to the inner wall of the barrel tip portion 21, and a pen body 8 made of fibrous material is attached to the rear portion. The first requirement is that the peripheral surface of the annular seal member 9 is inserted in close contact with the annular seal member 9 so that at least the rear end of the pen body 8 and the front end of the valve rod 4 can be brought into contact with each other in the valve opening operation state. To do. Further, in the first requirement, the second requirement is that the valve seat 5 of the valve mechanism 3 is integrally provided at the rear portion of the annular seal member 9.

Specific examples of the material of the annular seal member 9 include silicone rubber, other synthetic rubber, ethylene-vinyl acetate copolymer, and soft plastics such as polyethylene. Further, the inner diameter of the seal portion 91 of the annular seal member 9 is formed to be equal to or slightly smaller than the outer diameter of the rear portion of the pen body 8, but the sliding frictional resistance with the pen body 8 is at least that of the spring 6 with respect to the valve rod 4. It is set to be smaller than the forward biasing force.

As the pen body 8, resin such as felt or fiber bundle and heat-sealed body are appropriately adopted, but at least rigidity that can withstand the pressing force of the valve operation is required. Further, since the pen body 8 is brought into close contact with the annular seal member 9, at least the rear portion has a circular cross section, and the outer periphery thereof is formed with a straight surface in the axial direction. Further, since the pen body 8 enables continuous writing without frequent pressing operation, it is possible to retain an appropriate amount of ink.

The rear portion of the pen body 8 and the front end of the valve rod 4 may at least come into contact with each other during the pressing operation, and they may be separated from each other before the pressing operation, or they may be integrally fitted from each other before the operation. It may be fixed together.

The annular seal member 9 may be formed integrally with the valve seat 5, or may be of course formed of two members. (For example, a structure in which the annular seal member 9 is fitted to the front portion of the valve seat 5)

[0011]

[Action]

 When the pen body 8 is pushed rearward and the valve rod 4 is moved rearward against the bias of the spring 6, the valve hole 51 is opened and ink is supplied from the ink reservoir 24 to the pen body 8. Since the pen body 8 is made of fiber and has a strong capillary force, it is possible to quickly supply ink to the tip portion.

Since the annular seal member 9 is in close contact with the rear portion of the pen body 8, a large amount of ink does not flow out along the peripheral surface of the pen body 8 when the valve hole 51 is opened. In addition, the peripheral surface of the pen body 8 has fine capillary gaps made of fibrous material, and even if some ink leaks from the seal portion 91 due to sliding with the pen body 8, the pen body 8 itself is impregnated. Therefore, the leaked ink does not reach the tip of the pen body 8. Further, even if the inside of the ink storage portion 24 is pressurized due to temperature rise or the like and ink is blown out from the valve hole 51, the blown ink is absorbed in the rear portion of the pen body 8, so that the ink drops from the tip portion of the pen body 8. There is nothing to do.

When the ink impregnated in the pen body 8 is consumed and the pen body 8 is pressed again, the ink storage portion 24 is pressurized by the moving volume of the pen body 8 and the ink is It is discharged to the rear part of the pen body 8. At the same time, the same amount of air as the discharged ink passes through the pen body 8 and is forcibly sucked into the ink storage portion 24.

[0014]

【Example】

 Embodiments of the present invention will be described with reference to the drawings. (See FIGS. 1 to 3) The barrel 2 is a cylindrical body having an opening 22 at the rear end and a pen body projecting hole 23 at the tip, and the pen body 8 and the valve mechanism 3 are attached to the front portion 21. An ink reservoir 24 is formed behind the valve mechanism 3. Further, an opening 22 is provided at the rear end of the barrel 2, and the tail plug 10 is fitted into the opening 22.

The valve mechanism 3 includes a valve rod 4, a valve seat 5, a spring 6 and a spring seat 7. The valve rod 4 is slidably inserted into the center hole 73 of the spring seat 7 and is urged forward by the spring 6 to be pressed against the valve seat 5. A cross-shaped projection is provided on the front end surface of the valve rod 4 so as to be able to contact the rear end of the pen body 8. The spring seat 7 is formed with a cylindrical portion 74 that projects forward and holds the spring 6 inward, and a flange portion 71 that fits into the inner wall of the shaft cylinder 2. Further, the flange portion 71 has a plurality of flange portions. A notch 72 is provided to allow ink to flow. A valve hole 51 is formed at the center of the valve seat 5 and is fitted to the inner wall of the barrel tip 21. Further, the valve seat 5 is formed integrally with the annular seal member 9 to reduce the number of parts and improve the efficiency of assembly work.

The pen body 8 is a resin processed body of polyester fiber bundle (porosity of about 65%), and a step portion 81 is formed at an intermediate portion. The large diameter portion 82 is configured. The small-diameter portion 83 is exposed to the outside from the protruding hole 23 of the barrel tip portion 21 and becomes the writing tip portion, and the peripheral surface of the large-diameter portion 82 slides in close contact with the annular seal member 9 and the rear end surface thereof. It is in contact with the front end of the valve rod 4. Further, the large diameter portion 82 also functions as an ink retaining portion. Further, the stepped portion 81 comes into contact with an inward projection at the tip of the barrel 2 and serves as a stopper to prevent the pen body 8 from falling off the barrel 2.

The annular seal member 9 fitted and fixed to the inner wall of the barrel tip 21 is made of silicone rubber, and is formed integrally with the valve seat 5. Further, in order to reduce the sliding resistance with the pen body 8, the seal portion 91 becomes a circumferential inward projection to reduce the contact area. The seal part 91 is smaller than the outer diameter of the rear part of the pen body 8 by about 0.4 mm. In addition, after the annular seal member 9 is fitted into the shaft tube 2, a slight gap is formed outside the seal portion 91, and the seal portion 91 is formed with a deformable escape space to the outside.

[0018]

[Effect of the device]

 Since the fibrous rear surface of the pen body slides in close contact with the annular seal member, ink does not leak from the peripheral surface of the pen body, and even if the inside of the ink storage area is pressurized due to temperature rise, etc. Since the blown ink is absorbed by the body itself, ink dripping from the tip of the pen body is prevented. Further, when the valve mechanism is opened, ink is directly and quickly supplied from the valve hole to the tip of the pen body by the capillary force of the fiber, which enables smooth ink discharge without blurring. In addition, no unnecessary space such as ink storage space is required around or behind the pen in the tip of the barrel, so the entire barrel can be made a small diameter that is convenient for carrying, and the design has a slim appearance. It is possible to provide a writing instrument having.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of an embodiment of the present invention.

FIG. 2 is a longitudinal sectional view of an essential part showing an operating state of FIG.

FIG. 3 is a vertical sectional view of an annular seal member.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Liquid type writing instrument 2 Shaft cylinder 21 Tip part 22 Opening part 23 Projection hole 24 Ink storage part 3 Valve mechanism 4 Valve rod 41 Rod part 5 Valve seat 51 Valve hole 6 Spring 7 Spring seat 71 Collar part 72 Notch 73 Center hole 74 Cylindrical part 8 Pen body 81 Step part 82 Large diameter part 83 Small diameter part 9 Annular seal member 91 Seal part 10 Tail plug

Claims (2)

[Scope of utility model registration request] 1. A liquid of a type in which a pen mechanism, which is slidably held in an axial direction at a tip portion of a barrel, is pressed backward to operate a valve mechanism to supply ink in an ink storage section to the pen body. In the writing instrument, the annular seal member 9 made of a non-porous elastic body is fixed to the inner wall of the barrel tip portion 21, and the pen body 8 made of fiber is
A liquid writing instrument 1 in which a rear portion is inserted into the annular seal member 9 so that the peripheral surface is in close contact with the annular seal member 9, and at least the rear end of the pen body 8 and the front end of the valve rod 4 can be brought into contact with each other in a valve opening operation state. 2. The liquid writing instrument 1 according to claim 1, wherein a valve seat 5 of the valve mechanism 3 is integrally provided at a rear portion of the annular seal member 9.