JPH06241254A - Fixing method of coil spring - Google Patents

Abstract

PURPOSE:To provide a fixing method of fixing a coil spring simply and accurately to a fitting member where this coil spring is fitted. CONSTITUTION:A fitting member is a medium cap 3 which is installed in a cap of writing equipment free of slide motion, and a coil spring 2 is rotated, while this spring 2 is fixed to a spiral mounting part 7 accorded with a pitch to an end turn of this coil spring 2 installed on an outer circumferential surface of the medium cap 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fixing method for simply and reliably fixing a coil spring to a fitting member with which the coil spring is fitted.

[0002]

2. Description of the Related Art Conventionally, when a coil spring is fixed to a fitting member with which the coil spring is fitted, the coil spring is directly pressed into and fixed to the outer peripheral surface or the inner peripheral surface of the fitting member, or the outer circumference of the fitting member is fixed. The ribs formed on the surface or the inner peripheral surface are directly press-fitted and fixed.

Further, when the fitting member is a middle cap (inner cap) slidably mounted in the cap of the writing instrument, conventionally, as shown in FIGS. 5 and 6, a coil is provided in the cap 1 of the writing instrument. The spring 2 and the middle cap 3 are inserted, and the middle cap 3 is pushed at once to be fixed by press fitting. Reference numerals 1a and 3a denote rib portions provided on the cap 1 and the middle cap 3 for fixing both ends of the coil spring 2 by press fitting, and 3b denotes a middle cap 3 for slidably attaching the inside of the cap 1.
Is a rib portion provided on the outer periphery of the.

However, in the fixing by pressing the coil spring into the fitting member, there is a problem that the dimensional accuracy of the coil spring in the radial direction greatly varies, so that the fixing to the fitting member is difficult.

Further, as shown in FIGS. 5 and 6, when the fitting member is the middle cap 3 slidably mounted in the cap 1 of the writing instrument, the coil spring 2 cannot be fully compressed structurally, That is, since the cap 1 has the fitting portion 5 for mounting the clip 4, the coil spring 2 cannot be fully compressed.
There is a problem in that the manufacturing process is complicated because a process such as press-fitting the coil spring 2 is required in the previous process, and the coil spring 2 is attached to the outer peripheral surface of the middle cap 3 by press-fitting. , It is difficult to securely fix the middle cap 3 to the middle cap 3 and the coil spring 2
There is a problem in that the elastic force of (1) gets over the middle cap restraining projection formed in the cap 1 and gets out of the cap 1.

[0006]

SUMMARY OF THE INVENTION The present invention solves the above problems and provides a fixing method for simply and reliably fixing a coil spring to a fitting member with which the coil spring is fitted. An object of the present invention is to provide a fixing method for easily and surely fixing a coil spring to a middle cap which is a fitting member slidably mounted in a cap of a writing instrument, an applicator for cosmetics or the like. That is.

[0007]

As a result of intensive studies to solve the above problems, the inventors of the present invention have provided a fitting portion having a specific shape on a fitting member with which a coil spring is fitted. By fixing the coil spring to the mounting portion having the specific shape, the method for fixing the coil spring for the above purpose was successfully obtained, and the present invention was completed. That is,

The method of fixing the coil spring of the present invention is as follows.
It is characterized in that a fitting member to which the coil spring is fitted is provided with a spiral mounting portion whose pitch is matched to the end turn of the coil spring, and the coil spring is rotated to fix the coil spring to the spiral mounting portion. And
It is preferable to fix the coil spring to a spiral mounting portion provided on the outer peripheral surface or the inner peripheral surface of the fitting member. An example of the fitting member is a middle cap (inner cap) slidably mounted in a cap of a writing instrument, an applicator for cosmetics, or the like.

The method of the present invention will be described in detail below. Examples of the coil spring used in the method of the present invention include a coil spring made of metal or plastic, and the shape thereof is not particularly limited, and the coil spring can be fixed to the fitting member by the method of the present invention. I wish I had it.

The fitting member used in the method of the present invention is not particularly limited in shape as long as it fits a coil spring. For example, a cylindrical fitting member or a cylindrical fitting member. Examples include a member and an inner cap that is slidably mounted in the cap of a writing instrument. If this fitting member is a cylindrical fitting member, a spiral mounting portion with a pitch matched to the end turn of the coil spring is provided on the outer peripheral surface thereof or on the inner peripheral surface thereof if it is a cylindrical fitting member. It is provided.
The spiral mounting portion is of a spiral shape in which the pitch is matched with the end turn of the coil spring, and the spiral shape is not particularly limited as long as the coil spring is mounted in this spiral shape. An attachment portion formed of a protrusion or a attachment portion formed of a spiral hole may be used.

According to the method of the present invention, the coil spring having the above structure is rotated by a screwing method or the like to fix the coil spring to the spiral mounting portion having the above structure.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an example of the implementation of the method of the present invention will be described with reference to FIGS. This embodiment is a case where the fitting member is applied to a middle cap (inner cap) slidably mounted in a cap of a writing instrument including a marking pen having a collector structure. The same components as those of the conventional writing instrument shown in FIGS. 5 and 6 are designated by the same reference numerals.

As shown in FIGS. 1 to 3, on the outer periphery of the middle cap 3, there is provided a mounting portion 7 formed of a spiral projection having a pitch matched with the end turn of the coil spring 2. The coil spring 2 is rotated on the mounting portion 7 by a screwing method or the like to fix the coil spring 2 to the spiral mounting portion 7. Specifically, as shown in FIG. 4, the coil spring 2 and the middle cap 3 are inserted into the cap 1 of the writing instrument A, and the middle cap 3 is rotated by a screwing method while press-fitting the middle cap 3 at a time. The coil spring 2 is fixed to the spiral mounting portion 7 provided on the cap 3.

As a result, the clip 4 is inserted in the cap 1.
Since the fitting portion 5 for mounting the coil spring 2 is provided, the coil spring 2 can be easily and reliably fixed to the middle cap 3 even when the coil spring 2 cannot be fully compressed structurally. Further, since the coil spring 2 is structured so as to be firmly fixed to the middle cap 3, the middle cap 3 rides over the middle cap stopping projection 5 formed in the cap 1 by the elastic force of the coil spring 2 and the cap 1 is formed. You never get out of it.

[0015]

According to the method of the present invention, even if the dimensional accuracy of the coil spring in the radial direction varies, the variation can be absorbed, so that the coil spring is securely fixed to the fitting member. In particular, the coil spring can be reliably fixed to the fitting member even when the coil spring cannot be fully compressed. Further, in the method of the present invention, since the coil spring is fixed to the fitting member by the rotation of the screwing system such as the rotating jig, the press-fitting jig such as the hand press can be used as compared with the conventional press-fitting fixing method. Since it is not necessary, there is an advantage that the fixing work becomes easy. Further, in the method of the present invention, when the fitting member is applied to the inner cap which is slidably mounted in the cap, the coil spring is easily and reliably fixed to the inner cap even when the coil spring cannot be fully compressed structurally. Since the manufacturing process is simpler and the manufacturing cost is reduced than before, the coil spring has a structure that is securely fixed to the middle cap, so that the middle cap does not come out of the cap. Have.

[Brief description of drawings]

FIG. 1 is a partial vertical cross-sectional view showing an example of the implementation of the method of the present invention, showing a state in which a coil spring is fixed to a middle cap of a writing instrument as a fitting member.

FIG. 2 is a partial vertical cross-sectional view showing the middle cap shown in FIG.

FIG. 3 is an enlarged partial cross-sectional view of a spiral attachment portion provided on the outer peripheral surface of the middle cap shown in FIGS. 1 and 2.

FIG. 4 is a partial vertical sectional view showing an example of a usage state of the method of the present invention.

FIG. 5 is a partial vertical sectional view showing an example of a conventional use state.

6 is a partial vertical cross-sectional view showing a middle cap of the writing instrument shown in FIG.

[Explanation of symbols]

 A Writing instrument 1 Cap 2 Coil spring 3 Medium cap 4 Clip 7 Attachment part

Claims (3)

[Claims] 1. A fitting member for fitting a coil spring is provided with a spiral mounting portion having a pitch matched to the end turn of the coil spring, and the coil spring is rotated to attach the coil spring to the spiral mounting portion. A method for fixing a coil spring, which comprises fixing the coil spring. 2. The method of fixing a coil spring according to claim 1, wherein the coil spring is fixed to a mounting portion provided on the outer peripheral surface or the inner peripheral surface of the fitting member. 3. The method of fixing a coil spring according to claim 1, wherein the fitting member is a middle cap slidably mounted in the cap.