| 摘要 |
The circuit has a pneumatic or hydraulic cylinder (20) for opening and closing the door, with a magnetic valve (10) in the press line (14) to the working cylinder (20) controlled by an electric switch (12) operated by the driver. A parallel control line (22) incorporates a switch (23) operated upon the end position being reached. A press switch (24) is responsive to an abnormal press increase in the closure line (14) during a closure movement, to effect a safety overside. Pref. a 4/2 way magnetic valve (10) is used, the magnetic part being switched into the opposite position by each received current pulse. |
