| 摘要 |
1. Door-actuating arrangement, especially for doors in vehicles for conveying passengers, with a pressure medium-operated door drive means (22, 24) having the following features : (a) the door drive means (22, 24) has at least one actuating piston (22) having at least one active surface in the opening direction (opening surface) (21) and at least one active surface in the closing direction (closing surface) (23) of the door ; (b) a valve device (10, 26) controlling the pressure supply to the active surfaces (21 and 23) is provided which, for each active surface (21 or 23), has a blockable connecting path to its supply side ; (c) at least one setting device (17 or 29) actuated by means of a pressure medium is associated with each connecting path and controls the passage thereof ; (d) the door-actuating arrangement has a first emergency switch-off device (9, 14) and/or a second emergency switch-off device (3, 10, 26) with an emergency stopcock (3) controlling the connection between the supply side of the valve device (10, 26) and a pressure source (1) ; (e) the first emergency switch-off device (9, 14) contains a device (14) for monitoring the door resistance and emits an emergency signal when a door resistance of a predetermined magnitude occurs ; (f) on actuation of the emergency stopcock (3) of the second emergency switch-off device (3, 10, 26) the connection between the pressure source (1) and the supply side of the valve device (10, 26) is interrupted ; characterised by the features : (g) the valve device (10, 26) is so constructed that when pressure is supplied simultaneously to its setting devices (17, 29) both of its connecting paths are open ; (h) the valve device (10, 26) has associated with it an emergency valve device (third 3/2-way valve 5) which can be controlled by means of the emergency signal ; (i) the emergency valve device (third 3/2-way valve 5) i a) is connected at a first inlet (30) with the supply side of the valve device (10, 26) and at its outlet to the setting devices (17, 29) thereof, and is so constructed that on receiving the emergency signal it connects its outlet with its first inlet (30) and/or i b) has a second inlet (32) which is connected to the emergency stopcock (3) and which it connects with its outlet when there is no emergency signal present. |
