Tightener for traction unit e.g. strap, has swiveling lever with torsion bars, where each bar has one end rotatably connected to lever and another free end rotatably penetrating in machine part

摘要

The tightener has a swiveling lever (2) with torsion bars (3b) and a free end including a pulley (9) rotatably mounted and supported against a traction unit. A fixed case (11) receives the lever through a hub (7), and a dampening unit (24b) is provided between the case and the hub. Each torsion bar has one end rotatbly connected to the lever and another free end rotatbly penetrating in a machine part (21).