| 摘要 |
A release system, particularly for releasing hydraulic actuators for automatic openings having an articulated arm for swing-door gates, provided in a hydraulic circuit having a hydraulic pump ( 3 ), operated by a reversible motor, two cylinder-piston elements ( 6, 7 ), alternatively receiving hydraulic liquid (L) from the hydraulic pump ( 3 ) through two tubes ( 4, 5 ), a valve ( 9, 10 ) being provided along the tubes ( 4, 5 ), between each cylinder-piston element ( 6, 7 ) and the hydraulic pump ( 3 ), preventing the return of the hydraulic liquid toward the hydraulic pump ( 3 ), the return being permitted only by an inverse rotation of the pump ( 3 ) operation motor, the system being characterized in that a normally closed manual opening-closing elements ( 11 ) being provided along the tubes ( 6, 7 ), connected in parallel with respect to the pump ( 3 ). |
