JPS609038Y2 - Locking device between barrel and cap of writing instrument - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a locking device for securely fitting and locking a barrel and a cap in a writing instrument.

Conventionally, this type of device has been designed by providing a protrusion inside the opening of a cap made of synthetic resin, forming an annular protrusion at the position where the barrel made of synthetic resin is held, and engaging this annular protrusion with the protrusion of the cap. A configuration in which the cap is engaged and disengaged is known, but there is a problem in that the protrusion of the cap wears out due to repeated use and the engaged state becomes loose.

In addition, the engaging part between the cap and the barrel is made of at least metal, and an annular projection is formed inside the opening of the cap, and the protrusion is provided at the engagement position of the barrel, so that when the cap is engaged with and disengaged from the barrel. A configuration in which the protrusion and the annular protrusion are engaged and disengaged is also known, but this configuration has extremely little wear due to repeated use, but the annular protrusion becomes thick inside the opening of the cap. Since the protrusion has to be connected to and disengaged from the annular protrusion, it is difficult to escape due to extension, and since the protrusion is provided at the engagement position of the shaft cylinder, it is also difficult to escape due to deformation when it is engaged and disengaged from the annular protrusion. It's difficult to understand.

Therefore, considerable precision is required during manufacturing, resulting in poor workability and problems such as the engagement and disengagement operations often being too hard or too soft.

Therefore, the present invention is an attempt to solve the above-mentioned problems, by arranging an annular locking body made of metal, having arms, and capable of semi-rotating in a recess, and using a protrusion to semi-rotate the annular locking body. In other words, either the barrel or the cap is provided with an annular recess, and the two arms are bent into the recess. An annular locking body made of metal that can be rotated in half in the longitudinal direction using the bent part as a fulcrum is disposed with the bent part tightly fitted into the recess, and the other side of the barrel or the cap is provided with a plurality of annular locking bodies. A shaft cylinder in a writing instrument, which is provided with an individual or annular protrusion, and the annular locking body is rotated in half using the bent portion as a fulcrum by the protrusion, and the protrusion and the arm portion of the annular locking body are engaged with each other. The gist is a locking device for the cap.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

Reference numeral 1 designates a cap having a plurality of or annular projections 2 on the inner surface, and the cap 1 is selected from metal, synthetic resin, etc., but metal is preferable at least in the portion that contacts the annular locking body described later. .

Reference numeral 3 denotes a shaft cylinder having an annular recess 4 at a position corresponding to engagement and disengagement with the protrusion 2 of the cap 1, and the recess 4 has two bent chests 6 and 6, and a bent portion. An annular locking body 5 made of metal that can be semi-rotated in the longitudinal direction as a fulcrum is disposed with its bent portion firmly fitted into the inner surface of the recess 4.

Therefore, in order to engage the cap 1 and the barrel 3,
First, as shown in FIG. 3A, when the cap 1 is moved in the direction of the arrow, the protrusion 2 of the cap 1 and the arm portion 6 of the annular locking body 5
collide with each other, and if the movement of cap 1 continues, the third
As shown in Figure B, the arm portion 6 is pressed and the annular locking body 5 begins to rotate using the bent portion as a fulcrum without slipping, and then,
As shown in FIG. 3C, the annular locking body 5 is rotated halfway, and the arm portion 6 is brought into contact with the inside of the protrusion 2 of the cap 1, thereby achieving engagement.

In addition, in order to separate the cap 1 and the barrel 3, contrary to the case of engagement, if the cap 1 is pulled in the direction of the arrow in FIG. 3C, the state shown in FIG. It will be in the state shown in Figure A.

As described above, in the present invention, the annular locking body 5 made of metal and having the arm portion 6 is turned in half by the protrusion 2 of the cap 1 to lock and release, so a high degree of precision is not required. Furthermore, wear due to repeated use is extremely low.

Further, as shown in FIG. 4, the bottom 4'' of the recess 4 of the shaft cylinder 3 may be made of an elastic member such as a thin metal piece, so that the annular locking body 5 can be easily rotated in half due to this elasticity. In this case, it is preferable to provide a locking groove for locking the bent portion of the annular locking body 5 in the bottom 4'' of the recess 4, and as shown in FIG. By positioning the annular locking body 5 between the arms 6 of the annular locking body 5, the annular locking body 5 can be reliably rotated in half.

Furthermore, in the above description, the protrusion is placed in the cap and the annular locking body is placed in the annular recess provided in the shaft cylinder.
As shown in the figure, an annular recess 4' is provided in the cap 1', and an annular locking body 5a is disposed in this recess 4'.
It is also possible to provide a protrusion 2'' at .

[Brief explanation of drawings]

Fig. 1 is a sectional view of the main part of the present invention, Fig. 2 is a perspective view of the annular locking body of the present invention, Fig. 3 is an operation diagram of the present invention, Fig. 4, Fig. 5
FIG. 6 shows another embodiment of the present invention. 1...Cap, 2...Protrusion, 3...
...Axis tube, 4...Annular recess, 5...
- Annular locking body, 6...arm part.

Claims (2)

[Scope of utility model registration request] (1) An annular recess is provided in either the barrel or the cap, and an annular lock made of metal is bent into the recess, has two arms, and is rotatable in half in the longitudinal direction using the bent part as a fulcrum. The bending part of the stopper body is tightly fitted into the recess, and the other side of the barrel or the cap is provided with a plurality of or annular protrusions, which allow the annular stopper to engage the bending part. A locking device for a barrel and a cap in a writing instrument, which rotates in half as a fulcrum and engages a protrusion with an arm of an annular locking body. (2) A locking device for a barrel and a cap in a writing instrument according to claim (1), in which the bottom of the annular recess is an elastic member.