JPH0137949Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a hollow mold made of thermoplastic resin that is integrally blow-molded with the end portion.

In particular, the side moldings of automobiles have tended to become larger in recent years, and so-called hollow moldings, which are hollow inside, are being used to reduce weight and absorb external forces.In recent years, the end portions have also been molded simultaneously. Blow molding molding has been considered.

When trying to attach this blow-molded hollow molding to a vehicle etc. via an adhesive layer (for example, double-sided adhesive tape), since it is hollow, the pressing force from the front side is not transmitted to the back side much, making it easy to install and work. It was my fault.

Therefore, it protrudes from the mounting surface side into the hollow part,
Furthermore, a groove is provided that opens on the mounting surface, and a plurality of tab-like protrusions are arranged in the axial direction of the hollow molding in order to transmit the pressing force from the front side to the back side. ). However, as shown in Fig. 1, in such a hollow molding, when an impactful external force is applied to the front side, it deforms as shown by the two-dot chain line and comes into contact with the upper edge of the rib-like protrusion in an upright position. There is a risk of stress concentration occurring at the upper edge, resulting in breakage.

In view of the above, the object of this invention is to provide a hollow molding having a function of absorbing external force. The gist of this invention is to form a protrusion projecting from the mounting surface side toward the hollow portion at a predetermined angle and a stop portion that prevents the protrusion from being tilted by more than a predetermined angle.

An explanation will be given below based on FIGS. 2 to 4 showing examples of this invention.

1 shown in Figures 2 and 3 is a hollow mold of this invention;
2 is a hollow part, 3 is an upper surface, and 4 is a mounting surface. 5
The hollow molding 1 is provided with a groove that protrudes from the mounting surface 4 side into the hollow part 2 and opens on the mounting surface 4 side.
It is a rib-shaped hollow protrusion extending in the width direction.
Further, the hollow protrusions 5 are inclined at a predetermined angle θ in the axial direction, and are arranged at predetermined intervals. 6 prevents the hollow protrusion 5 from being tilted by more than a predetermined angle θ';
This is a hollow stopper portion having a groove that projects into the hollow portion 2 from the body mounting surface 4 side and opens to the mounting surface 4 side.

Next, the operation of this invention will be explained. When an external force is applied to the upper surface 3 of the hollow molding 1, it is deformed (indented) as shown by the two-dot chain line in FIG. 2, and comes into contact with the upper edge of the hollow protrusion 5. When pushed further downward, the hollow protrusion 5 tilts as shown in FIG.
Then, it comes into contact with the hollow contact portion 6. The tilting range of the hollow protrusion 5 is a range in which the material remains flexible, and when subjected to an impactful external force, the hollow protrusion 5 deforms until it comes into contact with the hollow stopper 6, but the hollow protrusion 5 Since the hollow stopper part 6 prevents further deformation after contacting the stopper part 6, it exerts a nonlinear shock absorption function, and immediately returns to the state shown in FIG. 2 when it is released from the external force. (original state). Although the hollow protrusion 5 has a flat cross-sectional shape, it can be changed to other shapes.

As described above, the hollow molding according to this invention has a hollow protrusion obliquely installed in the hollow part and a hollow stopper part that restricts the inclination of the hollow part, so that it absorbs an impactful external force before the upper surface comes into contact with the hollow stopper part. It is characterized by its ability to function.

[Brief explanation of the drawing]

Figure 1 is a vertical side view of a conventional hollow molding, Figure 2 is a vertical side view of a conventional hollow molding.
4 to 4 show an embodiment of this invention, FIGS. 2 and 3 are longitudinal sectional side views, and FIG. 4 is a sectional view taken along the arrow line A-A' shown in FIG. 1...Hollow molding, 2...Hollow part, 3...Front side (top surface), 4...Mounting surface, 5...Protrusion, 6...
Temporary department.

Claims (1)

[Scope of utility model registration request] In a hollow molding that is integrally blow-molded with the terminal part and has a protrusion formed from the mounting surface side to the front side, the protrusion is inclined at a predetermined angle, and the protrusion is not tilted by more than a predetermined angle. A hollow molding with a structure in which a temporary seat is formed.