Vehicle fenders – Buffer or bumper type – Bumper having impact force absorbing means directly...
Reexamination Certificate
2000-05-05
2001-05-08
Pape, Joseph D. (Department: 3612)
Vehicle fenders
Buffer or bumper type
Bumper having impact force absorbing means directly...
C293S133000
Reexamination Certificate
active
06227582
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a bumper beam and a bumper system for a vehicle.
2. Background Art
Japanese Patent Applications Laid-open No. Toku-Kai-Hei 5-178144 or No. Toku-Kai-Hei 5-278537 disclose vehicular bumper beams formed by extruded material of aluminum.
FIG. 8
is a schematic view showing the construction of an example of these bumper beams. This bumper beam
70
is formed by a plurality of box-like closed cross sections
72
and every wall constituting the bumper beam
70
has a uniform wall thickness T. In an event of collision, the impact load inputted from the front of the vehicle is absorbed by the buckling deformation of wall sections of the bumper beam
70
.
However, in an actual collision, the vehicle does not always take a desirable attitude for impact absorption. Further, the input direction of impact energy differs in every specific event of collision. Therefore, in some case of collision, the buckling deformation is inadequate and rather, for example, the bumper beam is deformed to a rhomboid configuration. This inadequate buckling deformation makes it difficult to absorb the impact energy efficiently.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide a bumper beam having such a structure as always generating a stable buckling deformation.
A bumper beam having a box-like closed cross section comprises a front wall, a rear wall, a plurality of horizontal walls connecting the front wall and the rear wall and at least one of said horizontal walls having a smaller thickness in the neighborhood of a center thereof than a thickness in the neighborhood of connecting points thereof with the front wall and the rear wall respectively.
REFERENCES:
patent: 3883168 (1975-05-01), Goupy et al.
patent: 3997207 (1976-12-01), Norlin
patent: 4597601 (1986-07-01), Manning
patent: 5201912 (1993-04-01), Terada et al.
patent: 5785367 (1998-07-01), Baumann et al.
patent: 6000738 (1999-12-01), Stewart et al.
patent: 1045183 (1978-12-01), None
patent: 5178144 (1993-07-01), None
patent: 5278537 (1993-10-01), None
Farber Martin A.
Fuji Jukogyo Kabushiki Kaisha
Pape Joseph D.
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