JP3029408U - Writing instrument cap - Google Patents

Abstract

(57) [Abstract] [PROBLEMS] To prevent the ink from being blown into the inner sheath while maintaining the tight fitting property of the pen tip portion with a simple structure. An inner lid (2) is fitted in a cap (1), and an inner sheath (5) accommodating an elastic seal member (12) is elastically supported in the inner lid (2). Accommodating, inner sheath (5)
A tubular body (9) whose upper end abuts on the flange (6) provided on the
Even when the inner sheath (5) moves to the uppermost side, the lower end (11) of the inner sheath (5) is fitted in the inner lid (2) so that it is inside the tubular body (9). Especially, since the elastic force of the repellent strip (8) supporting the inner sheath (5) is larger than the elasticity of the seal member (12), the pen tip portion (13) is placed inside the seal member (12). To prevent the ink from being blown into the inner sheath (5) by inserting and removing the cap.

Description

[Detailed description of the device]

[0001]

[Technical field to which the device belongs]

 The present invention relates to a structure of a double-sealing type writing instrument cap, which has an inner sheath for preventing ink from being scattered from the tip of the writing instrument.

[0002]

[Prior art]

 Conventionally, when a water-based ink is used especially in a writing instrument, not only is the cap fitted, but the inner sheath is housed inside and the shaft head part is double-sealed to remove the ink from the pen tip part. There is something that prevents the emission, but when the inner sheath is made of an elastic material, the ink often becomes a gas and permeates the inner sheath, preventing the pen tip from drying. I couldn't.

Therefore, it has been proposed to use a dense and gas-impermeable sealing material for the inner sheath. However, since the inner sheath using this sealing material does not have elasticity, elasticity is added to the contrary. Therefore, it was necessary to store a ridge between the inner lid and the inner sheath in the cap to give the inner sheath elasticity toward the open end side of the cap. The movement of the inner sheath due to this ridge is kept within the cap, and at the same time, the inner sheath and the tip portion are fitted tightly to prevent the ink from spreading, and the structure is simple and easy to assemble. In order to be able to do so, as shown in Japanese Utility Model Publication No. 62-28473, an inner lid that fits in the cap is closely fitted to the circumference of the tip of the writing instrument at its open end. The inner sheath made of a dense material is elastically accommodated in the inner lid of the, and a flange is formed on the outer side of the inner sheath, and the tubular body fitted in the inner lid contacts the flange. Was proposed.

[0004]

[Problems to be solved by the device]

 However, in the above-mentioned conventional writing instrument cap, no matter how tightly the tight fitting of the inner sheath and the tip is made, the pen tip itself is opened in the inner sheath. Due to the change in the air pressure, the ink was ejected from the pen tip into the inner sheath with the cap fitted on the tip.

Therefore, the present invention aims to improve the drawbacks of the above-mentioned conventional one, and maintains the close fitting property and the ease of assembling the cap of the conventional example to the writing shaft by the simple structure. At the same time, it is possible to prevent the ink from blowing into the inner sheath.

[0006]

[Means for Solving the Problems]

 Therefore, the inner lid, which is tightly fitted to the barrel at the open end, is fitted into the cap, is made of a dense material that is elastically supported by the ridges, and the pen tip is housed inside. The inner sheath containing the elastic seal member is housed in the inner lid, and even if the inner sheath moves to the uppermost side when the inner sheath moves to the uppermost side, The lower end of the inner shell is fitted in the inner lid so that it is inside the tubular body. It is meant to be greater than elastic.

[0007]

[Embodiment of device]

 With the above configuration, when the cap is fitted on the brush shaft while maintaining the advantages of the conventional example, the ink is stored in the cap by the pen tip part being stored in the elastic seal member. It is possible to prevent the ink from being blown from the pen tip into the inner sheath without being affected by the change in the air pressure.

[0008]

【Example】

 This invention will be further described with reference to an embodiment incorporated in a conventional batting type water-based ballpoint pen shown in the drawing. (1) is a cap, and inside the cap (1), an inner lid (2) is attached by a head screw (4) integrated with a locking tool (3) fixed in the inner lid (2). To be An inner sheath (5) made of soft polyethylene is movably inserted into the inner lid (2), and a collar portion (6) provided on the outer periphery of the inner sheath (5) and an upper inside (2) of the inner lid (2). A ridge (8) is inserted between 7) to move the inner sheath (5) toward the tubular body (9). The tubular body (9) is fixed in the inner lid (2), and even when the inner sheath (5) is moved to the uppermost position to fit the inner sheath (5) on the tip (10). The lower end (11) of the inner sheath (5) is inscribed in the tubular body (9).

On the other hand, an elastic seal member (12) is accommodated in the inner sheath (5), and when the inner sheath (5) is fitted on the tip (10), the pen tip portion (13) is The inner sheath (5) is positioned so as to be recessed into the seal member (12), and the pen tip (13) is brought into contact with the seal member (12) so as to be sufficiently recessed therein. The elastic force of the repellent strip (8) is adjusted to be larger than the elasticity of the seal member (12).

Further, (14) is a refill, which is housed in the barrel (21) and the die (20) fitted to the tip of the barrel (21), and the tip (10) protrudes from the die (20). Suru A fitting part (16) that engages with the locking part (15) at the open end of the inner lid (2) and seals this part is provided above it, at which time the lower end of the inner sheath (5) The part (11) is fitted with the tip (10), and at the same time, the nib part (13) is recessed in the seal member (12) in the inner sheath (5). (17) is a clip. (18) indicates an air hole, and (19) indicates a packing, and the outlet space of the air hole (18) is sealed by the inner sheath (5) and the packing (19). Also in the case of a direct liquid type water-based ballpoint pen, the air groove instead of the air hole (19) can be sealed by the inner sheath (5) and the packing (19).

Since the writing instrument cap (1) according to the embodiment of the present invention has the above-mentioned configuration, the cap (1) is sealed to the barrel (21) by the open end of the inner lid (2) as in the conventional example. Simultaneously with the fitting, the nib portion (13) is doubly sealed by the close fitting of the tip (10) and the inner sheath (5), and at the same time, by the inner wall of the tubular body (9) and the tip (10). Since the lower end (11) of the inner sheath (5) is strongly pressed, it completes the sealing, and furthermore, the inner sheath (5) is guided by the tubular body (9) during its movement, so The sheath (5) will not tilt and the fitting with the chip (10) will be uncertain and malfunction will not occur. Then, the pen tip (13) itself is also immersed in the seal member (12) in the inner sheath (5), and the seal material (12) is tightly closed to close the cap (1). Even if the air pressure in the cap (1) fluctuates due to the removal from the barrel (21), the ink does not blow out into the inner sheath (5). In particular, the pen tip portion (13) can be more easily attached to the seal member (12) by making the elastic force of the rib (8) supporting the inner sheath (5) larger than the elasticity of the seal member (12). It is more effective in preventing the ink from blowing out because it immerses into the inside of the contact.

[0012]

[Effect of device]

 With the above configuration, double sealing is complete and the operation can be performed reliably. Therefore, a writing instrument composed of a gel ink ballpoint pen refill using water-based ink, a batting type water-based ballpoint pen refill, a direct liquid type ballpoint pen refill, etc. In addition, it is possible to prevent the tip of the pen from drying, and in addition, it is easy to assemble simply by inserting and fixing the inner sheath and the inner sheath with the ridge and seal member fixed using a jig etc. In addition, it has an excellent effect that it can prevent the ink from blowing out in the inner sheath.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing a state in which a cap according to an embodiment of the present invention is fitted on a writing instrument.

[Explanation of Codes] 1 Cap 2 Inner Lid 3 Locking Tool 4 Head Screw 5 Middle Sheath 6 Collar 7 Upper Inner 8 Repulsion 9 Cylindrical 10 Tip 11 Lower End 12 Sealing Member 13 Pen Tip 14 Refill 15 Engagement Stop part 16 Fitting part 17 Clip 18 Air hole 19 Packing 20 Base 21 Shaft cylinder

Claims (2)

[Scope of utility model registration request] 1. An inner lid, which is tightly fitted to a shaft cylinder at an open end, is fitted in a cap, and an inner sheath is housed in the inner lid, and the inner sheath is elastically supported by a ridge. A cylindrical body that is made of a dense material and that accommodates an elastic seal member that abuts the pen tip portion inside the inner sheath, and the upper end abuts on the flange portion on the outer periphery of the side wall of the inner sheath. Even in the case of the above, the writing instrument cap is fitted in the inner lid so that the lower end of the inner sheath is inside the tubular body. 2. An inner lid, which is tightly fitted to the barrel at the open end, is fitted in the cap, and the inner sheath is accommodated in the new inner lid, and the inner sheath is elastically supported by a ridge. When the inner sheath moves to the uppermost side, a cylindrical body made of a dense material that accommodates the elastic seal member that abuts the pen tip portion in the inner sheath, and the upper end abuts the collar portion on the outer periphery of the side wall of the inner sheath. In addition, the elastic force of the elastic seal member that is accommodated in the inner sheath is the elastic force of the ridges that are fitted in the inner lid so that the lower end of the inner sheath is inside the tubular body. A writing instrument cap that is larger.