ELECTRO-PNEUMATIC ACTIONING SYSTEM FOR PASSENGER VEHICLE DOOR

An electro-pneumatic door-operating system in passenger transport vehicles, in particular for outer swing doors of buses. A drive cylinder (3) which can be acted upon on both sides can be connected to a compressed air source (1) via a reversing valve (2). The reversing valve (2) can assume three valve positions for the closing movement, the opening movement and a powerless state in which the drive cylinder (3) is acted upon on both sides. The powerless state is triggered by actuation of an emergency release (4). An emergency control device for triggering an opening movement of the door has a bistable relay (5) with a first relay contact (5.1) which effects the closing movement in a "CLOSED" position and effects the opening movement in an "OPEN" position and is connected to a voltage source (SP) on the one hand via the driver's pushbutton (S1) and on the other hand via a second relay contact (5.2) and an opening switch (S2) which closes in the event of an attempt at opening. The relay (5) has a T input (5.3) which is connected to the driver's pushbutton (S1) and an S input (5.4) which is connected to an emergency switch (S3). When the emergency switch (S3) is actuated, the first relay contact (5.1) is placed in the "OPEN" position and the second relay contact (5.2) closed. When the opening switch (S2) closes, the opening movement of the door is effected.