JPS6112136Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to the improvement of a writing instrument commonly called a felt-tip pen.

Generally speaking, this type of writing instrument has an ink-impregnated batting inside the barrel that makes up the main body, and the rear end of the fibrous pen core that passes through the nib, which is attached to the tip of the barrel, is filled with the batting. When brought into contact, the ink impregnated in the batting is transferred to the pen core by capillary action, and
It is designed to be used for writing. However, in conventional writing instruments of this type, the filling may sway or move in the axial direction within the barrel due to shocks or drops, resulting in poor contact between the filling and the pen core, making it impossible to use for writing. This caused some inconvenience.

This invention was made with the intention of solving the above problem, and by forming an insertion part at the rear end of the tip shaft that protrudes into the batting, the batting will sway horizontally due to impact or dropping. It is an object of the present invention to provide a writing instrument which is characterized by being able to prevent the writing instrument from moving in the axial direction and maintain contact between the filling and the pen core.

Examples of this invention will be described below based on the drawings.

Fig. 1 is a front view showing a main part of the writing instrument of this invention in cross section, and in the figure, 1 is a barrel that constitutes the main body of the writing instrument. A filler 3 is disposed in the axial direction, and a front shaft 4 and a tail plug 5 are fitted to the tip and rear end of the shaft tube 1, respectively. In this case, the tip shaft 4 is formed into a cylindrical shape with a mouth 6 attached to its tip, and a writing pen core 7 normally used is passed through the through hole 4'. The protruding part of the pen core 7 protruding from the end side enters into the filling 3 and comes into contact with the filling 3.
In this invention, as shown in FIGS. 3 and 4, the outer skin 2 of the batting 3 is attached to the insertion side end of the tip shaft 4.
An insertion portion 4a having the same diameter or a slightly smaller diameter than the inner diameter of the tip shaft base 4b is formed.
A plurality of step ribs 4c, 4c, . . . , which also serve as insertion guides are formed at appropriate intervals in the circumferential direction between
By dividing a into at least two parts with respect to the axis, the insertion part 4a has elasticity, so that the insertion part 4a of the tip barrel 4, which is equipped with the pen core 7 through it.
The padding 3 and the pen core 7 can be brought into contact with each other when the padding 3 is inserted into the outer skin 2 of the filling 3 and the outer skin 2 and the step ribs 4c, 4c, . . . are in contact with each other. It is possible to prevent the filling 3 from swaying laterally or moving in the axial direction within the barrel 1 due to phenomena such as falling or falling, and it is possible to continue to maintain the contact state between the filling 3 and the pen core 7. It can be done.

Note that 8 is an air passage, and in this case, it is formed in two places from the flange part 4d of the tip shaft 4 to the insertion part 4a side, but it is not necessarily limited to this structure, and it can be changed as necessary. Needless to say, it may be provided at any location.

Although not shown, if the insertion side tip of the tail plug 8 is similarly inserted into the outer skin 2 of the batting 3, it is possible to further ensure that the batting 3 is prevented from lateral shaking and movement in the axial direction. It is possible to achieve better effects.

As explained above, the writing instrument of this invention is
An insertion portion is formed at the rear end of the tip shaft to be inserted into the outer skin of the batting, and a plurality of inserting portions are formed at appropriate intervals in the circumferential direction between the insertion portion and the base of the tip shaft and abut against the end of the outer skin of the batting. Since the insertion part of the tip shaft is inserted into the outer shell of the batting, and the end of the batting outer shell and the stepped rib are in contact with each other, the batting and the pen core come into contact with each other. Therefore, even if a shock or drop occurs, the filling can maintain contact with the pen core without swaying or moving in the axial direction within the barrel, making it possible to maintain the contact between the filling and the pen core. It is possible to obtain a writing instrument of good quality that eliminates the causes of defects, and its utility value is remarkable.

[Brief explanation of the drawing]

Figure 1 is a front view showing the main parts of the writing instrument of this invention in cross section, Figure 2 is an enlarged sectional view taken along the - line in Figure 1, and Figure 3 is a cross section showing half of the tip of this invention. A front view, and FIG. 4 is a side view thereof. 1... shaft cylinder, 2... outer skin, 3... filling, 4...
Tip shaft, 4a...insertion part, 4b...tip shaft base, 4c
...Stepped rib, 7...Pen core.

Claims (1)

[Claims for Utility Model Registration] 1. An insertion portion is formed at the rear end on the insertion side of the tip shaft attached to the tip of the shaft cylinder to be inserted into the outer skin of the batting disposed in the shaft cylinder. The writing instrument also includes a plurality of step ribs that also serve as insertion guides and come into contact with the ends of the outer skin at appropriate intervals in the circumferential direction between the insertion portion and the tip shaft base. 2 Utility model registration claim 1, in which the insertion portion is formed into at least two parts with respect to the axis
Writing implements listed in section.