Drive device for automobile rollover bar has piston-cylinder unit of auxiliary positioning drive uncoupled from spring-loaded piston for raising rollover bar in event of accident

摘要

The drive device (2) has a piston-cylinder unit (4) with a spring-loaded piston, released for moving the rollover bar (3) from a stowed position into a raised working position, in the event of an accident, with a double-action auxiliary piston-cylinder unit used as a positioning drive, for controlling the movement direction and velocity of the spring-loaded piston. The auxiliary piston-cylinder unit is uncoupled from the spring-loaded piston in the event of a crash, via the hydraulic cylinder used for releasing the retention device for the spring-loaded piston.