Truck rail frame

Land vehicles – Wheeled – Running gear

Reexamination Certificate

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Details

C280S785000

Reexamination Certificate

active

06286868

ABSTRACT:

BACKGROUND OF THE INVENTION
In trucks, it is common to provide a pair of parallel spaced-apart frame rails of C-shaped cross section which extend the length of the truck. In one prior art approach, the frame rails are of steel of a C-shaped cross section with a vertical web portion and upper and lower flange portions of a constant thickness, with the thickness of the flanges being equal to the thickness of the webs. Aluminum frames have also been manufactured with frame rails of a C-shaped cross section with a web portion of a constant thickness and web flanges which are of a constant thickness but of a thickness which differs (e.g. is thicker than) from the thickness of the web portion.
SUMMARY OF THE INVENTION
The present invention relates to vehicle frame rails, preferably of steel, which are formed with a web section which is not of a constant thickness. Preferably, the frame rail is formed by roll forming to produce the variable thickness, although other techniques, such as machining, could be used.


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