| 摘要 |
<p>The cylinder (1') has an orifice (73') provided in fluid communication with a pressure chamber (10'). Another orifice (51') has fluid communication with atmosphere. A selective connection unit (28') i.e. slide, is mechanically connected to an auxiliary actuating unit (26'), so that the connection unit occupies an isolating position in which the orifices are isolated from each other when the actuating unit occupies a rest position. The connecting unit occupies a connecting position in which the orifices are in fluid communication when the actuating unit occupies a pushing position. The pressure chamber is adapted to be supplied by a pneumatic pressure agent source i.e. compressed air source.</p> |
