FR2494185A3 - PLASTIC MOLDING ELEMENT, COMPRISING TWO COMPONENTS, IN PARTICULAR BUMPERS AND BODY PARTS FOR AUTOMOTIVE VEHICLES - Google Patents

Abstract

THE INVENTION PROVIDES A MOLDED ELEMENT OF PLASTIC MATERIAL. THE ELEMENT ACCORDING TO THE INVENTION IS CONSISTED BY TWO DIFFERENT MATERIALS OF WHICH THE EXTERIOR MATERIAL 6 HAS HIGH RESILIENCE CHARACTERISTICS, A HIGH RESISTANCE TO EXTERNAL AGENTS AND A GOOD ABILITY TO SUBJECT HOT PAINTING, AND THE INTERIOR MATERIAL 7 IS PLASTIC PATIERS PRESENT A GREAT MECHANICAL RESISTANCE. APPLICATION TO BUMPERS, MUDGUARDS, DOORS AND HOODS FOR MOTOR VEHICLES.

Description

two-component plastics molded element, in particular

  The present invention relates to molded elements made of

  plastics intended to form part of vehicle bodies

  the, and more precisely a bumper and / or other elements

  designed to withstand high mechanical stresses.

  The element according to the invention, in particular a bumper for motor vehicles, is characterized in that it is made of two materials having different characteristics and which are introduced into the same mold by

  injections immediately successive.

  More precisely, the mold is first introduced into the mold.

  plastic material intended to constitute the outer surface

  of the element and, immediately thereafter, the other plastic material

  than intended to constitute the inner part of this same element. The plastic material with which the first injection is made, and which will be injected in insufficient quantity to be able to fill the mold, will be chosen from among the materials

  plastics with high resistance to external agents

  strong resilience and good aptitude for

baking paint.

  On the other hand, the plastic material used for second injection must have a high mechanical strength and serve as a filling beam of the envelope made

  in the material used for the first injection.

  Another characteristic of the elements according to the invention

  stems from the fact that by using injection systems

  tion, otherwise known, it is possible to

  to mold objects in which the mechanical resistance

  is not uniform, but differential depending on their length or surface. This possibility is widely exploited in the manufacture of bumpers for motor cars, as well as in the manufacture of

  exterior and interior bodywork requiring

specific ticks of resistance.

  The invention is described hereinafter with reference to the drawing

  annexed, by way of example only, and on which -

  FIG. 1 is a partial view in section and in perspective

a bumper according to the invention.

  FIG. 2 is a view similar to that of the previous FIG.

  dente, illustrating a variant of the transverse profile of the

shocks.

  According to the invention, the bumper 5, in plastic material,

  tick, comprises an outer part 6, 6a and respective-

  6, 6b, and an inner part 7 and respectively

  7a, the first part, that is to say the outer part,

  being made of a plastic material having a resistance

  high level of external agents and a good ability to

withstand hot painting

  On the other hand, the inner part 7, 7a is made in one

  plastic material with high mechanical strength.

  The material constituting part 6 is injected first into the mold, but in a calculated amount of such material.

  that the mold cavity is filled only by

  tially. The plastic material 7, 7a, selected from materials of suitable mechanical strength, is injected immediately thereafter, in a predetermined quantity, so as to be able to push the material indicated by 6 against the walls.

inside the mold.

  It is thus possible to produce a two-component element 5, that is to say component 6, exterior and visible, tinted or able to be tinted to the desired color, and the inner component 7, 7a, serving as element reinforcement,

  the place of conventional metal frames.

  The ribs 6a and 6b respectively, visible in the sectional view of the element, are determined by the configuration of the mold, which is made according to the use of the element.

in question.

  The bumpers for cars thus produced are light, economical and very resistant to shocks, this also thanks to their great ability to deform elastically within well known limits and depend on

  characteristics of the two materials used.

  Through the same two-component molding process, it is also possible to advantageously produce doors for automobile bodies, mudguards, chests, hoods,

  dashboards, as well as any items not directly related-

  to kinematic mechanical devices.

Claims (2)

claims   1. A molded plastic element, in particular a bumper, a fender, a door and a hood for motor vehicles, characterized in that it consists of two different materials whose outer material (6) has characteristics of high resilience, high resistance   external agents and a good aptitude for painting   while the inner material (7) is selected from   plastics with high mechanical strength   the purpose of producing elements having lightness characteristics, finished by molding and economically advantageous cost compared to the elements. traditional analogues.   2. Plastic molded element, by means of two successive injections, according to claim 1, characterized in that, seen in cross section, it has a profiled outer surface and, in juxtaposition with respect thereto, ribs projecting projections (6a, 6b)   forming channels filled by the plastics material (7, 7a).