JPS59215817A - Method for providing mechanical fixing means such as clip or the like in plastic molding - Google Patents

Abstract

PURPOSE:To erect securely a mechanical fixing means such as a clip, etc. in the installing surface of a plastic molding by such an arrangement wherein a recessed portion is drilled in the installing surface of the mold and the head of a clip, etc. is inserted into the recessed portion and molten plastic is pressure injected into the gap between said recess and said head and it is caused to solidify. CONSTITUTION:A recessed portion 2 is drilled in the installing surface 5 of a plastic molding 1. Next, the head 6 of a mechanical fixing means such as a clip 3 etc. is fittingly inserted into said recess 2. After that, the molding 1 is installed in metal molds 10,11 wherein a passage 9 for molten resin is provided, and molten resin is pressure injected into the gap 12 between the recess 2 and the head 6 of the clip through the passage 9 and it is caused to solidify. At this time molten resin pressure injected into the gap 12 enters the circular recess 8 of said clip head 6 and at the same time it adheres to the inner wall of the recess 2 of the molding. By this method, a mechanical fixing means can be securely erected in the installing surface of a molding.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is directed to a method of providing a mechanical fastening means, such as a clip, to a plastic molding.

In recent years, plastic moldings of various shapes have been attached to the sides of automobile bodies for both protection and decoration. Also, recently, importance has been placed on the vehicle body protection function, and there is a trend towards wider and larger sizes.

By the way, most methods for attaching this molding to the car body are double-sided adhesive tape, hardening adhesives, or a combination of both. However, since plastic moldings expand and contract depending on heat history such as cold and warm temperatures, There is a risk of peeling off, and as the size increases, the weight also increases, so the risk of this is even greater. Recently, a structure has been proposed in which a mechanical fixing means such as a clip is provided on the mounting surface of the molding, particularly near the end of the molding, and the molding is mechanically fixed to the mounting hole drilled in the vehicle body.

On the other hand, it is preferable for this molding to be attached from the front to the rear of the car body from the viewpoint of its protection function, so plastic extrusion molded products are often used because it is easy to obtain long products with a constant cross section. In order to provide the mechanical fixing means, it is necessary to provide a groove in the mounting surface into which the clip head is inserted, as shown in FIG.

However, with this structure, it is difficult to identify the clip etc. in a predetermined position, and in order to fix it, the groove must be made of a metal body, and the head of the clip must be caulked at the front and back. It is necessary to position the clip by However, this configuration has disadvantages such as impairing the smoothness of the mounting surface of the molding and creating a gap between the molding and the molding, and deformation of the visible side surface of the molding during caulking. There is also a risk.

Therefore, the present invention aims to provide a method for providing a new mechanical fixing means such as a lip that eliminates such drawbacks. In this method, the head of a clip or the like is fitted and pressed into the recess, and molten plastic is press-fitted into the gap between the recess and the head, and the clip is hard buffed to the molding mounting surface by solidifying. .

An example of a real gun according to the present invention will be explained based on the drawings.
(Figure 2 is a central vertical cross-sectional view of the molding 1 and the clip 2 with the four parts 2 bored at predetermined positions;
(b) shows an example in which a groove 4 is further provided on the inner surface of the recess 2.

First, the molding 1 is extruded and cut to a desired length, and a recess 2 is drilled at a predetermined position on the mounting surface 5 (in the figure, for convenience of explanation, the upper side is the mounting surface) using a drill or the like. Incidentally, as shown in (+1), a recess R4 may be further formed on the inner surface of the recess by tapping or the like.

Next, a head 6 of a mechanical fixing means such as a clip 6 is inserted into the recess 2. It should be noted that this clip 6 etc. is made of plastic or gold etc. in advance.
It consists of legs 7 having elastic legs or locking parts and a head 6 that is fitted into the molding 1. Further, the clip head 6 is provided with projections and depressions at appropriate positions.

In the embodiment, four annular portions 8 are provided on the side surface of the head.

Thereafter, as shown in FIG. 3, it is mounted in a mold 10.11 provided with a channel 9 for molten resin, and the molten resin is forced into the gap 12 between the molding part 2 and the clip head 60 through the channel 9 and solidified. Note that the main flow path of the molten resin from outside the mold is perpendicular to the drawing.

At this time, the molten B3 resin press-fitted into the gap 12 enters the annular recess 8 of the clip head part B, and at the same time is secreted onto the inner wall surface of the four molding parts 2. In the case where the groove 4 is provided on the inner surface of the molding recess, the molten resin naturally flows into the mold and solidifies, and furthermore, the injected resin is tightly held in the recess 2. Therefore, the clip head 6 is enclosed within the four molding parts 2! It will be installed and tightly fixed.

The resin press-fitted into this gap 12 is applied to the molding 1
il, 1°, which is the same or compatible with the 4′ sword fat that constitutes
, (fat is preferable; for example, if the molding 1 is made of soft vinyl chloride resin, soft vinyl chloride resin or soft vinyl chloride resin mixed with ABS/, :(l fat, etc.) may be selected. In addition, in the above example, the head 6 of the clip 5 etc. is fitted and pressed into the four parts 2 of the molding 1 and then placed in the mold 10.11. Of course, it is also possible to provide an insertion hole in the recess, attach the legs of the clip to the extraction hole, and insert the clip head 6 into the recess so as to cover the molding 1 on the rear clip head 6. It is.

Next, the strength results of Examples will be shown.

As in the example shown in Fig. 2 (A), a recess 2 with a diameter depth of 1 (Jrzmφ -65v, m) is provided in the soft vinyl chloride resin molding using a drill, and the head 6 of the clip made of polyacetal resin is inserted. However, as a result of measuring the strength of soft vinyl chloride resin, its removal was 80%.
A measurement value of # was obtained.

This strength was sufficient to keep the molding firmly attached to the car body, and its usefulness was proven. Furthermore, this high punching strength is due to the fact that the recess 2 is drilled in the molding using a drilling means such as a drill, so fine roughness is formed on the inner surface of the recess 2. It is presumed that this is because the two are mechanically locked or the two are compatible on the surface.

As described above, the present invention provides a strong structure by simply providing a recess in a molding using a general-purpose drilling means (such as a drill), inserting the head of a clip or the like into the recess, and completely press-fitting the molten resin into the gap. This has the advantage that the mechanical fixing means can be installed upright on the mounting surface, and furthermore, the recess can be formed at any desired and accurate position, and has many other advantages.

Further, along with this, it is possible to almost prevent peeling of the ends of the molding, etc., and it is also possible to make the adhesion of moldings, which are becoming larger in size, stronger.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of the main part before attaching a clip to a conventional molding, FIGS. 2(A) and 2(B) are central vertical sectional views of the molding and clip according to the embodiment of the present invention, and FIG. 6 is a clip FIG. 4 is a cross-sectional view showing a state in which the molding in which the clip is inserted is clamped between the molds, and FIG. 4 is a perspective view of the molding provided with the clip according to the present invention. Go to patent application Inoue MCHIP Co., Ltd. γS1 Figure 2 (a) (b) No. 3
1 Figure 4

Claims (2)

[Claims] (1) Drill a recess in the mounting surface of the plastic molding, fit and press the head of a mechanical fixing means such as a clip into the recess, press fit the molten plastic into the gaps between the four parts and the head, and solidify. A method of providing a mechanical fixing means such as a clip to a plastic molding. (2) Create a recess on the mounting surface of the plastic molding.
1. A method for providing a mechanical fixing means such as a clip to a plastic molding according to claim 1, which further comprises providing a groove on the inner surface of the recess.