VARIABLE THICKNESS ROLL FORMED BEAM
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United States of America Patent
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Issued Date -
Dec 11, 2014
app pub date -
Apr 24, 2014
filing date -
Jun 10, 2013
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A bumper reinforcement beam provides improved bending stiffness and strength, while reducing weight and maintaining functional bending impact strength. The illustrated beam is roll formed and includes a B-shaped cross section with upper and lower tubular sections sharing a common horizontal wall. A first material of the lower tubular section, including the common horizontal wall, is thinner than a second material forming a remainder of the upper tubular section. By using this arrangement for bumper beams that are likely to be impacted above a centerline, beam weight can be reduced by 2.5% to 6.7% or greater; while the stroke (intrusion into the vehicle) of impactors is generally maintained and maximum load capability (beam bending strength) is maintained.
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