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Retractable writing tool

A writing tool, retractable technology, applied in writing utensils, writing parts, printing, etc., can solve problems such as small elastic parts, reduced airtightness, and balance damage

Inactive Publication Date: 2008-09-03
PENTEL KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, in the above-mentioned writing instrument without a cap, the sealing cap is connected to the sealing cylinder via the hinge portion, therefore, not only cannot the complete airtightness be achieved when the elastic force of the elastic member is small, but also when the elastic force is large, the airtightness may sometimes be insufficient. full
That is, the side on which the linear member is attached will be strongly stretched, and a gap will be generated near the hinge portion fixed to the seal cylinder, resulting in incomplete airtightness.
That is to say, since the direction of the force that pushes the seal cap against the seal cylinder is not parallel to the long axis of the writing instrument, when it is strongly stretched, the extension of the linear part and the extension of the hinge will make the balance Damaged, resulting in reduced airtightness

Method used

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Examples

Experimental program
Comparison scheme
Effect test

no. 1 Embodiment

[0042] combine Figure 1 to Figure 10 A first embodiment of the present invention will be described. figure 1 It is a partial vertical cross-sectional view showing the state when the writing material 2 is stored, that is, the state when the sealing cap 4 is sealed. In the front part of the shaft cylinder 1, there is provided a sealing cylinder part 3 which is urged forward through the elastic member 7. The front end of the sealing cylinder part 3 is locked on the stepped part 1n, thereby preventing the However, it is also possible to integrally form the sealing cylinder portion 3 on the inner surface of the aforementioned shaft cylinder 1 . As shown in FIG. 7 , on the inner surface of the rear portion of the sealed cylinder portion 3 , an inner rib 3 a for maintaining airtightness with the outer wall of the front portion of the writing element 2 is formed. In addition, in the present embodiment, on the sealing cover 4, three thin line parts 51, 52, 53 are integrally formed r...

no. 2 Embodiment

[0061] Figure 12 to Figure 15 The second embodiment of the present invention is shown. The plurality of thin wire portions 51, 52, 53 may also be integrally formed on the sealing cap 4 as in the first embodiment described above. However, the rear ends of the two thin line parts 52, 53 are fixed on the guide tube 6, while the other thin line part 51 is loosely inserted into the guiding through groove 6c (or In the through hole), and the reduced diameter portion of the previous example is not formed in multiple. In addition, as shown in FIG. 14 , near the rear end of the thin line portion 51 , a locking protrusion 51 e is provided, and the locking protrusion 51 e can be locked in the aforementioned through groove 6 c. That is, when the above-mentioned writing body 2 is stored, the locking protrusion 51e is locked on the locking step portion 6b provided near the through groove 6c on the outer surface of the aforementioned guide cylinder 6, so that it will be connected with the...

experiment example

[0072] About the said retractable writing instrument, the measurement of sealing force and the evaluation of aging durability were performed by the following method.

[0073]

[0074] exist figure 1 In the state, the impact member 2b is removed from the writing body 2, and a silicon tube (not shown) is connected to the rear end of the writing body 2 in a sealed state. The other end of the silicon tube was connected to a leak tester (LEAK TESTER (manufactured by Tokyo Seiki Co., Ltd.)) in a sealed state. Then, about half of the shaft cylinder 1 on the sealing cylinder portion 3 side is immersed in a suitable container filled with water. In this state, use the leak detection device to push any air pressure for 12 seconds, so that the sealing part between the sealing cylinder part 3 and the sealing cover 4, or the front part outer wall of the writing body 2 and the inner rib 3a will not be leaked. The critical value of the air pressure at which air bubbles are generated in th...

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PUM

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Abstract

A retractable writing material has a writing body retractable in a shaft tube, and has a seal cover and a seal tube portion that seal a writing portion of the writing body while interlocking with a forward / backward movement of the writing body. The seal cover and a guide tube that is fixed to the writing body are connected by plural fine line portions, and the seal cover and the fine line portions are integrally formed. The seal cover is opened and closed relative to the seal tube portion by the advance and retreat of the fine line portions. The tip of the writing portion is reliably sealed with the seal cover and seal tube portion when the writing body is in a stored position, so that the writing body is prevented from drying.

Description

technical field [0001] The present invention relates to a telescopic writing instrument with a writing body that can be extended and retracted in the shaft cylinder, and a sealing cover and a sealing cylinder that are linked with the front and rear movements of the writing body to seal the writing part of the writing body . Background technique [0002] As a conventional retractable writing implement, for example, a writing implement without a cap described in Japanese Patent Publication No. 5-68360 is known. This capless writing instrument is provided with a sealing cylinder with a through hole for the writing part at the front end of the writing body to stretch out and retract in its main body, and a sealing cover is installed to swing freely near the front end hole of the sealing cylinder. , when the writing section is stored, the sealing cover is closed by the linear member biased by the elastic member, so that the writing section is kept in a sealed state. According t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B43K24/02B43K5/17
Inventor 福井久男古市明典宫下泰
Owner PENTEL KK
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