JPH0442148Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement in the internal structure of the barrel of a writing instrument having an ink storage body, such as a felt-tip pen.

The ink absorbing body is made of a filling made of crimped fibers and covered with an outer skin.The ink absorbing body is made of a filling made of crimped fibers and covered with an outer skin. The conventional general structure is that it is held by being stopped by the part. In addition, the structure of the ink absorbing body includes one in which the filling is inserted into the tube, and one in which the filling is wrapped with a film.The materials used include those in which the filling is PP fiber, PET fiber, acetate fiber, etc. The tube is made of PP or PVC, and the outer film is made of PP, PET, cellophane, etc. If the ink storage body is installed in the barrel and receives an impact in the direction of the tip of the brush due to a fall, etc. If the impact force is weak, there will be no problem due to the holding force of the stopper based on the conventional structure, but the impact force When the pen core becomes large, the filling shifts from the outer shell and blocks the air hole between the space around the outer periphery of the filling and the space where the pen core connects to the filling, causing ink to blow out. This gap between the filling and the outer skin is large, for example, when the filling is PET fiber and the outer skin is tube.
In addition, if the filling is PP fiber and the outer skin is a PP tube, and the fiber and tube are bonded, and the filling is
There are differences depending on the structure and material, such as PET fibers or acetate fibers whose outer sheath is made of various films such as cellophane, which are relatively small, but in either case, it is not possible to prevent the filling from shifting in the event of a strong impact. . The object of the present invention is to improve the structure of the shaft cylinder so that even if the filling is displaced due to a strong impact, the air holes will not be blocked and ink will not blow out.

The present invention has a first stopper which has a stepped portion at the rear end where the front end surface of the ink storage body blocks in the inner hole of the barrel body, and a second stopper which has a smaller diameter at the front end and also has a stepped portion at the rear end. By forming a stopper and having a notch that communicates from the inner hole of the second stopper to the outer peripheral space of the ink storage body, clogging of the air hole can be prevented. To effectively prevent ink from blowing out.

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a longitudinal sectional view of the main part of the barrel 1 of the present invention.
A plurality of rib-shaped first stoppers 2 are provided in the vicinity of the front end of the inner hole of the shaft cylinder 1 at required angles in the circumferential direction, and the front end surface of the ink absorber 3 abuts against the rear end thereof. It forms part 4. Further in front of the first stopper 2 is a second stopper 6, which is a cylindrical body with a smaller inner diameter and whose outer periphery and the shaft cylinder outer wall 5 are connected by a plurality of ribs 13 in the circumferential direction. A stepped portion 7 is formed at the end. Further, in the side wall 8 of the cylindrical portion of the second stopper 6, a plurality of notches 9 are provided at locations where the ribs 13 are not connected, extending from the rear step portion 7 to the front end. In addition, 10 in the drawing is the outer skin of the ink storage body 3, and 11
1 is a batting, and 12 is a rib that grips and holds the outer surface of the ink storage body 3.

When the ink absorber 3 is attached to the shaft cylinder 1, the front end surface periphery of the ink absorber 3 is attached to the first stopper 2.
However, if a strong impact force is applied here and the filling 11 is displaced, the front end surface of the filling 11 will be stopped by the second stopper 6. In this case, the inner hole 14 where the connection between the batting 11 and the pen core is located communicates with the space 15 between the ribs 13 at the outer periphery of the second stopper 6 through the notch 9, and this space 15 is filled with ink. It communicates with the outer peripheral space 16 of the storage body 3 to prevent the air holes from being blocked.

The present invention is constructed as described above, and even if the filling is displaced due to a strong impact on the writing instrument, it can prevent the air holes from clogging and effectively prevent ink from being sucked out.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, in which Fig. 1 is a vertical cross-sectional view of the main part, Fig. 2 is a cross-sectional view taken along line A-A in Fig. 1, and Fig. 3 is a cross-sectional view taken along line A-A in Fig. 1. FIG. 4 is a cross-sectional view taken along line CC in FIG. 1. 1... Shaft cylinder, 2... First stopper, 3...
Ink storage body, 4... step part, 5... shaft cylinder outer wall part,
6... Second stopper, 7... Stepped portion, 8... Side wall, 9... Notch, 10... Outer skin of ink storage body, 11... Filling, 12... Rib, 13... Rib, 14...Inner hole part, 15...Space part, 16...
Peripheral space.

Claims (1)

[Scope of utility model registration request] A second stopper having a smaller diameter and a step at the rear end is provided in front of the first stopper, which has a step at the rear end where the front end surface of the ink storage body blocks in the inner hole of the barrel body. 1. A shaft cylinder of a writing instrument having an ink storage body, such as a felt-tip pen, characterized in that the second stopper has a notch that communicates with the outer peripheral space of the ink storage body from the inner hole of the second stopper.