Patent ID: 8523298

Claim:
Tensioning apparatus for a construction machine, comprising: a frame bearing an idler wheel linear guide, in which at least one guide piece holding an idler wheel axle is movable and which includes a linear guide for a slider movable in the same guiding direction and coupled with the guide piece, the slider arranged as a base in a portal structure with two guide strips situated externally at outer portal walls, and a longitudinally extending, cylindrical pressure element connected to a portal cross bar; and a tensioning means of a tensioning device supported in the frame and positioned to act in the linear guidance direction and having at least one elastomer spring body to apply tension to the tensioning device, the elastomer spring body being formed of an incompressible high-strength elastomer material as a spring, said elastomer material having a Shore A hardness of greater than 60 Shore and and a central longitudinal bore for a guide pin.