@Roberto zampari: You can achieve that using the custom timed lifts sprites available here. You'll need to use timed_lift_manual.asm, but edit it and replace the X_Speeds: and Y_Speeds: lines with these:
Code
X_Speeds: db $00,$F0,$10,$00,$00,$F0,$10,$00,$00,$F0,$10,$00,$00,$F0,$10,$00 Y_Speeds: db $00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00,$00