JP2007290108A - Drill for hollow rubber - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a drill for hollow rubber capable of surely exhausting chips to the outside in bore processing at a clip mounting part (hollow part) of a weather strip by projecting a tip of a cutting part outward from an axial center on an outer face extension, and forming the axial center in one direction. <P>SOLUTION: In this drill for hollow rubber, one blade with a tip of a cutting part projecting outward from an axial center is provided at the bottom of a drill shank body. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a hollow rubber cone for processing a hole for attaching a clip to a weather strip to be attached to an automobile door.

  First, a conventional example is shown about the shape and attachment state of a weather strip and a clip. As an example, the weather strip includes a main body portion and a clip. The main body includes a substantially flat base along the flange at the periphery of the door opening of the automobile, and a hollow seal. On the flange side wall surface of the base portion, a buffer portion having a substantially flat plate shape and having substantially the same thickness is provided. The base portion is made of a hard material, and the seal portion and the buffer portion are made of a soft material having relatively flexibility. When the weather strip is locked and fixed to the flange, the buffer portion is elastically deformed by pressing the base portion toward the flange by the clip. For this reason, the gap between the main body portion and the flange is surely sealed, and there is one that can suppress intrusion of water or the like. (See Patent Document 1)

  Another conventional example is a mounting structure in which a body side weather strip having a mounting base and a hollow seal portion is mounted along a body flange formed by superposing inner and outer panels of an automobile body panel. In some cases, the mounting base is fixed by a clip in the vicinity of the body flange of the inner panel. (See Patent Document 2)

When the clip is attached to the weather strip having the above structure, it is necessary to perform drilling.
At this time, there are the following tools as the hollow rubber cone TK used.
A cylindrical main body H provided with a circular cutting edge K around the entire lower end is mainly used.
The chip KZ is clogged in the main body H, and in the worst case, it remains in the hollow portion or cannot be completely cut and caught.
JP-A-2005-153601 JP 2004-306833 A

  According to the conventional hollow rubber cone TK described above, the chip KZ is clogged in the main body H, and in the worst case, it remains in the hollow portion or cannot be completely cut and is caught. Therefore, since the clip cannot be put into the hole and the chip KZ is removed and reinserted, it takes a lot of time and labor, so a hollow rubber cone that does not leave the chip KZ in the hollow part is desired. It is rare.

  The present invention is intended to solve the problems of the conventional configuration as described above. The tip of the cutting portion protrudes outward from the shaft center, is provided on the outer surface extension line, and extends in one direction of the shaft center. An object of the present invention is to provide a hollow rubber cone that can reliably discharge chips to the outside during drilling in the clip attachment portion (hollow portion) of the weather strip.

As a means for achieving the above object, the present invention is characterized in that a single blade formed by projecting the tip of the cutting portion outward from the shaft center is provided at the lower portion of the cone shaft main body.
Moreover, the front-end | tip of a cutting part is provided on the outer surface extension line of a cone-axis main body.
And a cutting part is formed in one direction of the axial center of a cone-axis main body.
Further, the cutting edge angle of the cutting part is about 15 °.
Furthermore, the back angle of the cutting portion is about 30 ° with respect to the axis.
In addition, the cutting surface of the cutting part is set to a substantially ¼ elliptical shape.
And the back surface of a cutting part is made into a half egg shape, It is characterized by the above-mentioned.

1) With a single blade formed by projecting the tip of the lower cutting part of the cone shaft body outward from the axis and forming the cutting part provided on the outer surface extension line of the cone shaft body in one direction of the axis. The tip of the cutting part bites into the clip portion (hollow part) of the weatherstrip while rotating, and the cutting is hooked on the tip of the cutting part by the elasticity of the rubber, so that it can be reliably discharged upward.
2) By cutting the cutting edge angle of the cutting portion to about 15 °, it is possible to securely bite into the clip mounting portion of the weather strip.
3) By making the back angle of the cutting part about 30 ° with respect to the axial center, the outer periphery of the cutting is appropriately pressed, and chips are easily discharged by the reaction force (elasticity) after cutting. .
4) By making the cutting surface into a 1/4 substantially elliptical shape, it is possible to more reliably bite into the clip mounting portion of the weather strip.
5) Chips can be more reliably discharged by making the back surface into a half egg shape.

The hollow rubber cone 1 has a tip 3a1 of the cutting portion 3a projecting outward from the axis G at the lower portion of the cone shaft body 2, provided on the outer surface extension line S of the shaft body 2, and in one direction of the axis G ( A single blade 3 formed on the right side) is provided.
The single blade 3 has a cutting edge angle H of the cutting portion 3a of about 15 ° and a back surface angle H1 of about 30 ° with respect to the axis G.
Moreover, the cutting surface 3a2 is made into 1/4 substantially elliptical shape, and the back surface 3a3 is made into a half egg shape.
In addition, the shaft diameter K of the cone shaft body 2 is set to φ3 mm as an example.

Examples of use of the hollow rubber cone 1 will be described below.
In order to drill holes in the clip mounting portion KT (hollow portion T) of the weather strip U, first, the hollow rubber cone 1 is rotated and the tip 3a1 of the cutting portion 3a of the single blade 3 is pressed against the clip mounting portion KT. Cutting while. (Fig. 4)
At this time, cutting is performed while appropriately pressing the outer periphery of the chip KZ1 on the back surface 3a3 of the cutting portion 3a. (Fig. 5)
Finally, the hole AN can be processed without being discharged to the outside at the tip 3a1 of the single blade 3 and entering the hollow portion T. (Fig. 6)

  The clip KP and the anchor KP1 are press-fitted into the hollow portion T and attached to the hole AN1 of the clip attachment portion KT of the weather strip U that has been drilled as described above.

  In the embodiment of the hollow rubber cone 1 described above, the shape and angle of the cutting portion, the blade edge angle, and the back surface angle can be somewhat changed within the range of the same functions and effects.

  The front view of the hollow rubber cone of this invention.   The side view of the hollow rubber cone of this invention.   The bottom view of the hollow rubber cone of this invention.   The cone 1st cutting state figure for hollow rubber of the present invention.   The cone 2nd cutting state figure for hollow rubber of the present invention.   The cone 3rd cutting state figure for hollow rubber of the present invention.   A side view of a weatherstrip.   The top view of a clip.   The front view of the attachment state of the clip to a weatherstrip.   The partial vertical side view of the attachment state of the clip to a weatherstrip.   The longitudinal cross-sectional view of the principal part of the hollow rubber cone which shows a prior art example.

Explanation of symbols

1 --- Cone for hollow rubber 2 --- Cone shaft main body 3 --- Single blade 3a--Cutting part 3a1--Tip 3a2-Cutting surface 3a3--Back G --- Axis center S --- Extension of outer surface Wire H --- Blade angle H1--Back angle K --- Shaft diameter U --- Weather strip KT--Clip mounting part T --- Hollow part KZ1-Chip AN--Hole KP--Clip KP1-Anchor

Claims (7)

  A hollow rubber cone characterized in that a single blade formed by projecting the tip of a cutting portion outward from the axis is provided at the lower part of the cone shaft main body.   The hollow rubber cone according to claim 1, wherein the tip of the cutting portion is provided on an outer surface extension line of the cone shaft main body.   The hollow rubber cone according to claim 1 or 2, wherein the cutting portion is formed in one direction of the axis of the cone shaft main body.   The hollow rubber cone according to claim 1, 2 or 3, wherein a cutting edge angle of the cutting portion is about 15 °.   The hollow rubber cone according to claim 1, 2, 3, or 4, wherein the back angle of the cutting portion is about 30 ° with respect to the axis.   6. The hollow rubber cone according to claim 1, wherein a cutting surface of the cutting portion is made into a substantially 1/4 elliptical shape.   The hollow rubber cone according to claim 1, 2, 3, 4, 5 or 6, wherein the back surface of the cutting portion is formed in a half-egg shape.

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