Gm Global Technolgoy Operations, Inc.

James P Chatterley

Chi-Mou Ni

Apparatus and method for hydroforming multiple components simultaneously with a smaller capacity press than would be possible using conventional hydroforming methods and apparatus. Die pairs are positioned with multiple die cavities in series so that the separating force transmitted to a press holding the dies equals the force developed in a single die cavity, even though multiple components are being formed in the die cavities.

Method and apparatus for hydroforming multiple components with reduced press loading

A self steering two-wheel trailer including frame and hitch means for rigidly securing the trailer to a motor vehicle so as to be pivotable relative thereto in the vertical direction only, and adjustable link means pivotally connected between the wheels, the adjustable link means including tie bars axially aligned and interconnected at their inner ends by damper means suitable for responding to road load conditions upon reversing the direction of travel to automatically accommodate pivoting of the wheels to a toe-in attitude in the new direction of movement.

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Washington, MI, United States of America

James P Chatterley