Patent ID: 8572809
Filing Date: 2013-11-05
Classification: E05F,E05Y,Y10T

Abstract:
1. An apparatus for spring-assisted pivoting of a liftgate or door against gravity between a closed position and an open position, comprising: a tracker comprising a support bracket and a control cam; a length-adjustable lever guided in the control cam of the tracker; a coupling rod configured for translatory movement and operatively connected to the length-adjustable lever, said coupling rod configured to rotationally move a hinged lever associated with the liftgate or door; a torsion bar spring system having torsion bar springs arranged in parallel in a meander pattern and connected with one another in fixed rotative engagement; wherein a first outer torsion bar spring of the torsion bar spring system is constructed as a bearing-torsion bar spring and a second outer torsion bar spring of the torsion bar spring system is constructed as a lever-torsion bar spring which is connected in fixed rotative engagement with the length-adjustable lever, with both the first and the second outer torsion bar spring being supported in the support bracket of the tracker; and an adjusting device connected in fixed rotative engagement with the bearing-torsion bar spring and variably lockable relative to the support bracket.