JP2674363B2 - Method of molding weather strip mold connection - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION This invention relates to a weather strip, such as automotive door glass run, particularly, the weather strip having a trim part which insert is embedded
The present invention relates to a method for molding a mold connecting part .

[0002]

2. Description of the Related Art Door glass runs installed near the door belt line of automobiles usually have two different top and bottom sections.
It is configured by connecting the extruded bodies of the book at a mold connecting portion formed by molding. The extruded body above the door belt line is provided with a trim part having a substantially U-shaped cross section attached to the flange part of the door sash and a guide part for slidingly guiding the wind glass, and the trim part is provided with a reinforcing sheet metal. The manufactured insert is buried. On the other hand, the extruded body below the door belt line does not have a trim portion, and only the guide portion is provided by being fitted to the retainer. Then, after each extruded body is cut into a required length, the extruded bodies are set in a mold with their end portions facing each other at a predetermined interval, and the die connection portion is formed between the end portions to form an integral body. Connected to.

FIG. 6 is a front view showing a door glass run near a conventional door belt line. In the figure, 21 is an extruded body mounted above the door belt line,
At the end, both the trim portion 26 and the guide portion 27 are horizontally cut. One side wall of the trim portion 26 also serves as one side wall of the guide portion 27, and a sheet metal insert 28 is embedded in the trim portion 26. Note that the insert 28 may be exposed on the above-mentioned cut surface by pulling rubber for the sake of cutting. 2
Reference numeral 2 denotes an extruded body that is mounted below the door belt line, and is formed only from the guide portion 30 that does not have an insert. Then, these extruded bodies 21 and 22 are
These ends are set to face each other at a predetermined interval and set in a mold (not shown), and a molding material is injection-molded between the ends to form a mold connecting portion 23, and the two extruded bodies 21 and 22 are integrated. Connected to. In this molding, the cut surface of the trim portion 26 is also filled with a part of the molding material to form the covering portion 29, and the exposed end portion of the insert 28 is embedded in the covering portion 29 to improve the appearance. I tried to prevent rust.

[0004]

However, in the conventional door glass run, the trim portion 26 cannot be formed long due to the attachment to the door, and the mold connecting portion 23 becomes larger by that amount, which is attractive. There was a problem that was worse. In addition, the mold connecting portion 23 is generally provided with each guide portion 2
There is also a problem that the sliding resistance of the door glass becomes large when the mold connecting portion 23 becomes large, because the sliding treatment for the door glass as performed in Nos. 7 and 30 is not performed.

Therefore, an object of the present invention is to reliably prevent the cut end of the insert from being exposed to improve the appearance and prevent rust, and further reduce the size of the mold connecting portion to improve the appearance near the connecting portion. Another object of the present invention is to provide a weather strip capable of reducing the sliding resistance of the door glass by lengthening the guide portion.

[0006]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention forms a mold connecting portion at the end portion of an extruded body having a trim portion having an embedded U-shaped cross section .
In this method, the end of the trim section is stepped leaving one side wall.
By cutting it into a rectangular shape, it is almost orthogonal to the longitudinal direction of the extruded body.
Make a cut surface that faces in the direction, and set the end of the extrusion
And abut on one side wall of the mold that has a protrusion
Keep the cut surface away from the bottom of the mold cavity.
Hold in a space and fill the cavity with rubber material
By doing so, a mold connection part with a covering part that covers the cut surface is formed.
Characterized by shaping.

Here, the weather strip is not particularly limited in shape as long as it is an extruded body having a trim portion, but in the case of an automobile door glass run, it is arranged above and below the door belt line. In order to mold-connect the extruded body of the book, the end of the upper extruded body provided with the trim portion is step-cut with the trim portion leaving one side wall thereof. Then, simultaneously with the molding of the mold connecting portion, a covering portion that covers the cut surface is formed along the cut line of the extruded body. Also, in this case,
By forming a protrusion on the mold and holding one side wall of the trim part of the extruded body at a position separated from the bottom of the cavity of the mold by this protrusion and performing molding, the end of the insert is surely inside the covering part. Will be buried in.

[0008]

According to the present invention , the cutting surface is cut by the projection of the mold.
Hold at a position away from the bottom of the mold cavity
As a result, it is possible to reliably prevent the cut end of the insert embedded in the trim section from being exposed by the covering section, improve the appearance, and prevent rust. Furthermore, since the extruded body is cut in a step shape while leaving one side wall of the trim section, the mold connecting section is made small to improve the appearance near the connecting section, and the guide section which has been subjected to the lubrication treatment is provided. The sliding resistance of the door glass can be reduced by increasing the length.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 5 show an embodiment in which the present invention is embodied in an automobile door glass run, and FIG. 1 is a sectional view showing a mold structure for molding a mold connecting portion of the door glass run,
2 is a front view showing a door glass run in the vicinity of a door belt line, and FIG. 3 is a sectional view taken along the line AA in FIG.
2 is a sectional view taken along the line BB, FIG. 4 is a sectional view taken along the line BB of FIG. 2 showing the sectional shape of the first extruded body at the step cut portion, and FIG. 5 is a sectional view taken at the line C of FIG. It is sectional drawing which follows the C line.

The vehicle door glass run of this embodiment is
As shown in FIG. 2, the trim portion 6 is disposed above the door belt line and has an insert 8 embedded therein and has a substantially U-shaped cross section.
The first extruding body 1 having the above is connected to the second extruding body 2 arranged below the door belt line and including only the guide portion 10 having no insert by the mold connecting portion 3. The first extruded body 1 and the second extruded body 2 are EPDM, respectively.
It is formed by cutting an extruded product made of a solid rubber material such as (ethylene / propylene / diene copolymer) into a required length, and is connected to the mold connecting part 3 which is the end of the first extruded body 1. The end is provided with a step cut portion 4 which is cut in a crank shape while leaving one side wall of the trim portion 6 having the insert 8.

That is, as shown in FIG. 3, the first extruded body 1 is a guide for slidingly guiding a trim portion 6 inserted into a flange portion (not shown) of the door sash and a door glass (not shown). The trim section 6 has a sheet metal insert 8 for reinforcement embedded therein. As shown in FIG. 4, in the step cut portion 4 of the first extrusion body 1,
The trim portion 6 is cut off with one side wall left, and a coating portion 9 for coating the insert 8 is formed on the cut surface integrally with the die connecting portion 3 at the same time. On the other hand, as shown in FIG. 5, the second extruding body 2 is not provided with an insert and is provided only with the guide portion 10 having the same cross-sectional shape as the guide portion 7 of the first extruding body 1.

As shown in FIG. 1, the mold 12 for molding the mold connecting portion 3 is composed of an upper mold 13, a lower mold 14, a middle plate 15, and a middle mold 16. The lower mold 14 is the covering portion 9
Cavity 17 for molding
7 and a protrusion 18 that abuts on the outside of one side wall of the trim portion 6 that is left in the vicinity of 7, and the cut surface of the one side wall of the trim portion 6 is held by the protrusion 18 at a position separated from the bottom surface of the cavity 17. Is configured to.

The mold connecting portion 3 is formed by using the mold 12 having the above structure.
When molding, first, the first and second extruded bodies 1, 2
Is cut to a required length, and the first extruded body 1 has a step cut portion 4
Is formed. Next, the cut ends of the extruded bodies 1 and 2 are set in the mold 12, and in that state, the plasticized rubber material is filled. As a result, a mold connecting portion 3 having a shape as shown in FIG. 2 is formed between the end portions of each extruded body 1 and 2, and the step cut portion 4 of the first extruded body 1 is formed along the cut line. The covering portion 9 is molded by the cavity 17 of the lower mold 14. At the time of molding the covering portion 9, since the side wall of the trim portion 6 is held at the regular position by the protrusion 18 of the lower mold 14, the cut end portion of the insert 8 is located at a position separated from the bottom surface of the cavity 17. It is held and this cut end is completely embedded in the covering 9. Therefore, the cut end of the insert 8 can be surely prevented from being exposed, the appearance can be improved, and rust can be prevented. further,
Since the first extruded body 1 is cut in a step shape while leaving one side wall of the trim portion 6, the mold connecting portion 3 is made smaller to improve the appearance near the connecting portion and is subjected to a lubrication treatment. It is possible to reduce the sliding resistance of the door glass by lengthening the existing guide portion 7.

Although the present invention is embodied in a door glass run in the above-mentioned embodiments, the present invention may be embodied by applying it to weather strips mounted on various parts of an automobile. It can be suitably applied to various weather strips in which the mold connecting portion is molded in the step cut portion. Further, the shapes and configurations of the respective parts can be arbitrarily changed and embodied, for example, by appropriately changing the positions of the protrusions of the mold, without departing from the spirit of the present invention.

[0015]

As described in detail above, according to the present invention, it is possible to reliably prevent the exposed end of the insert from being exposed to improve the appearance and prevent rust, and to further reduce the size of the mold connecting portion for connection. There is an excellent effect that the appearance around the portion can be improved and that the sliding resistance of the door glass can be reduced by lengthening the guide portion.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a mold structure for molding a mold connecting portion of an automobile door glass run according to a first embodiment of the present invention.

FIG. 2 is a front view showing a door glass run near a door belt line.

FIG. 3 is a sectional view taken along line AA of FIG. 2;

FIG. 4 is a sectional view taken along line BB of FIG. 2;

FIG. 5 is a sectional view taken along line CC of FIG. 2;

FIG. 6 is a front view showing a door glass run near a conventional door belt line.

[Explanation of symbols]

1 1st extruded body 2 2nd extruded body 3 type connection part 4 step cut part 6 trim part 8 insert 9 cover part

Claims (1)

(57) [Claims] 1. A method for forming a mold connecting portion on an end portion of an extruded body having a trim portion having a substantially U-shaped cross section in which an insert is embedded.
In the method, the end of the trim section is cut in steps leaving one side wall.
By the direction of a direction substantially orthogonal to the longitudinal direction of the extruded body.
A cutting surface is formed, the end of the extruded body is set in a die, and the protrusion provided on the die is set.
By bringing the raised part into contact with the left side wall, the cutting
Keep the cross section at a position spaced from the bottom of the mold cavity.
Holding and filling the cavity with a rubber material
It is possible to mold a mold connection with a covering that covers the cut surface.
A method for forming a mold connecting portion of a featured weather strip.