Vehicle seat

A vehicle seat, said seat adapted especially for motor vehicles of convertible or coupe construction, said vehicles each having a removable roof, comprising:

• a back rest having a support structure associated therewith, said back rest having an upper end,
• a rollover protection member located on said back rest,
• an adjustment device including at least one drive means adapted for fast activation,
• said rollover protection member being rapidly movable by said adjustment means in a displacement direction from a rest position to an operating position in which said member protrudes upwards over said back rest upper end,
• a pre-tensioned coil spring extendable when the rollover protection member is released in the displacement direction, where that end of the coil spring which is provided to move the rollover protection member into an operating position is held in a pre-tensioned position by positive interlock means which is adapted to be moved into a release position by means of an electromagnet activation element,
• at least one sensor capable of sensing a vehicle rollover condition for signaling activation of said activation element,
• an interlock means comprising two movable catches, said catches being oppositely pivotable and further comprising a toggle lever means adapted to be electrically activated for operating said catches, and
• an electromagnet for activating said toggle means, a dead response provided in the connection between the electromagnet and said toggle lever means, thereby enabling the armature of the electromagnet to move prior to the toggle lever moving from a position which holds the interlock means in the interlock position, where the interlock means preferably occupies a position above a dead point into a kink position, which corresponds to a release position.