| 摘要 |
A pneumatic door actuator is arranged such that in a door closing and/or opening stroke, under the influence of air pressure acting on one side of a piston 2, air on the other side of the piston is displaced to atmosphere up to a first point where a first valve 11, 12 closes so that remaining air acts as a slowing down cushion up to a second point where a further valve 22, 23, 24 opens to allow the actuator to speed up again towards a final closing and locking position. <IMAGE> |
