JPH0646717Y2 - Shaft cylinder connection structure - Google Patents

Description

[Detailed Description of the Invention] (Industrial field of application) The present invention relates to a shaft cylinder of a writing instrument, such as a fountain pen, a mechanical pencil, a ballpoint pen, or a felt-tip pen, which connects the inner and outer cylinders with the parts accommodated inside, or The present invention relates to a connecting structure of a shaft cylinder such as an applicator and a makeup container.

(Prior Art) Conventionally, for example, in a writing instrument, when the writing body is fixed to the neck shaft and fitted into the shaft cylinder, the neck shaft is press-fitted into the shaft cylinder, or a female screw portion and a neck of the shaft cylinder. For example, there is one in which the male screw portion of the shaft is screwed.

(Problems to be solved by the invention) However, when press fitting the neck shaft into the shaft cylinder, there is a risk that the shaft cylinder may crack when trying to fit tightly in order to prevent it from coming out. In addition to the twisting caused by the rotation between the parts to be stored in, the work of cutting the both will be added, resulting in an increase in cost. Therefore, this invention solves the drawbacks of the above-mentioned conventional ones, and intends to easily connect the inner and outer cylinders with a simple structure.

(Means for Solving the Problem) For that purpose, an outer cylinder having an engagement projection on its inner wall and an inner cylinder having a locking hole on its side wall for engaging with the engagement projection are formed on the side wall. By being provided on the flexible piece, the inner cylinder fitted to the outer cylinder is engaged and fixed.

(Operation) With the above configuration, when the inner cylinder is inserted into the outer cylinder, the flexible piece formed on the side wall of the inner cylinder flexes inwardly due to its elasticity to prevent passage of the engaging projection of the inner wall of the outer cylinder. Since it is allowed, the engaging projection passes over the flexible piece and fits into the locking hole, so that the inner and outer cylinders are connected without moving back and forth in the axial direction. Then, the flexible piece having the locking hole in the inner cylinder is integrally formed in advance, and the protrusion is formed in the outer cylinder, so that the structure can be processed relatively easily.

(Embodiment) This invention will be described in more detail with reference to an embodiment shown in the drawings.
Although the drawing shows the connecting structure of the barrel of the writing instrument, parts such as the writing body and the feeding portion are omitted, and commonly used parts are attached. (1) is an outer cylinder, and an engaging projection (6) is projected inward on the inner wall (8) of the cylinder, and a surface facing the fitting opening (9) in the axial direction is formed as an inclined surface (10). Then
The shape is such that it can be fitted into the locking hole (4) described later. (2)
Is an inner cylinder, and a flexible piece (3) is elastically formed at the end of the inner cylinder (2) in the fitting direction by being separated from the side wall by slits (5) and (5). Although the flexible piece (3) is formed from a part of the side wall, it may be elastically formed so as to extend and protrude from the edge, or a thin part may be formed integrally with the side wall. You may make it elastic. The flexible piece (3) is provided with a locking hole (4) at the position of the locking projection (6) when the outer cylinder (1) is fitted. A flange portion (7) having a larger diameter than the outer diameter of the inner cylinder (2) is provided on the other end of the inner cylinder (2), and this portion is gripped and inserted into the outer cylinder (1) to form a flange portion. (7) is
It abuts the opening edge (9) of the outer cylinder (1) to facilitate the engagement of the engagement protrusion (6) into the locking hole (4). The front inclined surface (10) of the engaging projection (6) facilitates sliding on the flexible piece (3) and fitting of the projection (6) into the locking hole (4). The locking hole (4) and the engaging projection (6) may be provided in a single number or a plurality of numbers as required.

Since this embodiment has the structure as described above, the inner cylinder (2) can be sufficiently connected only by axially moving the inner cylinder (2) into the outer cylinder (1), and the two can be fixed in the inner cylinder (2). Since the parts to be rotated are not rotated, the parts can be assembled at a predetermined position in the shaft cylinder without any risk of interference with the parts in the outer cylinder (1).

(Effect of the device) With the configuration as described above, not only can the inner and outer cylinders be connected easily, but also the structure of the inner and outer cylinders does not require threading, and the inner and outer diameter settings do not require precision, and fitting is possible. It has excellent effects such as no cracking and no increase in cost because it is reasonable.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of the present invention, and FIG. 2 is a vertical sectional view at the time of assembly. 1 ... Outer cylinder, 2 ... Inner cylinder, 3 ... Flexible piece, 4 ... Locking hole, 6 ... Engaging protrusion

Claims (1)

[Scope of utility model registration request] 1. An outer cylinder having an inner wall provided with an engaging projection protruding inward and an inner cylinder having a side wall provided with a flexible piece having an engaging hole. A connecting structure of a shaft cylinder in which an engaging projection of the outer cylinder is engaged with a locking hole of the inner cylinder.