JPH0462029A - Resin bumper - Google Patents

Abstract

PURPOSE:To realize a frontal wall surface, on which no flaw develops and keep stress balance against loading by a method wherein hollow tubular rear wall surfaces, which are molded by blowing, are swollen out at proper intervals so as to form trapezoidal supports, the top of each of which comes close to the inside of the frontal wall surface, and each rib is stretched between the supports so as to connect the supports integrally with each other. CONSTITUTION:In a hollow tubular body l, which is molded by blowing, a proper number of trapezoidal supports, the top of each of which is brought close to the frontal wall surface 3, are swellingly provided on the rear wall surface 2. Further, each rib 5 is stretched between the supports 4 so as to connect the supports integrally with each other Accordingly, on the frontal wall surface 3, flaw, which may develop due to the sticking of the support 4 to the frontal wall surface, does not develop, resulting in enhancing the commercial value as a bumper. Furthermore, since the frontal wall surface 3 is supported by the supports 4, which are connected integrally through the ribs 5, the bumper is strong against loading applied from the front, resulting in remarkably reducing its possibility of breakage.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to a resin bumper made by blow molding, and more particularly to a resin bumper that does not have any defects on the front wall surface and has a well-balanced stress against the load. .

Prior Art and Problems Figure 7 is a longitudinal sectional view and a perspective view of a synthetic resin bumper (hereinafter referred to as the conventional product) according to Utility Model Publication No. 1-33404. The bottom of the concave portion (2), which is formed by bulging out the back surface 0, becomes a defect and causes a decrease in product value.

Measures for solving the problems This invention aims to eliminate the above-mentioned drawbacks,
To provide a resin bumper that does not have any flaws on the front wall surface and has well-balanced stress against loads.

That is, in this invention, the rear wall surface of a hollow cylinder formed by blow molding is bulged out at appropriate intervals to form a trapezoidal column whose top approaches the inside of the front wall surface, and there is a gap between these columns. The gist of this invention is a structure of a resin bumper characterized by extending ribs and integrally connecting them.

Operation This invention is constructed as described above, and the tip of the support column provided by protruding from the rear wall surface is only close to the inside of the front wall surface and is not fixed, so that the load on the front wall surface is reduced. Not only can the front wall be easily supported, but the front wall surface can be beautifully finished without any defects.

Embodiments To explain this invention with reference to illustrated embodiments, FIGS. 1 and 2 are a partially cutaway plan view and a rear view, and FIG. FIG.

In the figure, (1) is a hollow cylinder made by blow molding,
A suitable number of trapezoidal supports (4) are provided on the rear wall surface (2) with their tops close to the front wall surface (3) and bulge out.

Further, a rib (9) is stretched between the pillars (2) and the pillars (2) and are integrally connected.

Since this invention is constructed as described above, the front wall surface (t3) is free from defects due to adhesion to the support column (a), and not only increases the commercial value of the bumper, but also increases the commercial value of the front wall surface (t3). ) are supported by pillars (a) that are integrally connected through ribs (4), so they are strong against loads from the front and the risk of breakage is significantly reduced. Figures 4 and 5 show FIG. 6 is a partially cutaway plan view and longitudinal cross-sectional view of another embodiment, and FIG. 6 is a CC and D-D cross-sectional view of the main part thereof.

Effects of the Invention As described above, according to the present invention, no flaws occur on the front wall surface, and the stress against the load from the front is comparable to that of conventional products.

[Brief explanation of drawings]

FIG. 1 is a partially cutaway plan view, FIG. 2 is a partially cutaway rear view, and FIG. 3 is a longitudinal sectional view of the main part. 4 and 5 are a partially cutaway plan view and rear view of another embodiment, and FIG. 6 is a vertical sectional view of the main part thereof. FIG. 7 is a vertical sectional view and a perspective view of a conventional product. The symbols in the figure are explained as follows. (1) is a hollow cylindrical body U is the rear wall surface B) is the front wall surface (A) is the trapezoidal support (9 is the rib Patent claimant Minoru Sangyo Co., Ltd. Representative Jun Iki - Figure 1 Figure 4 Figure 2 Figure 5 A-A sectional view B-B sectional view C-C sectional view D-DM Figure 3 s6 Figure 7

Claims (1)

[Claims] The rear wall of the hollow cylindrical body formed by blow molding is bulged out at appropriate intervals to form a trapezoidal column whose top approaches the inside of the front wall, and ribs are stretched between the columns. A resin bumper characterized by being integrally connected.