| 摘要 |
PROBLEM TO BE SOLVED: To provide a jack automatic extension device which has no fear to make a car body in an unstable condition by starting again the automatic extension in error, when the extension and contraction operation of the jack is stopped, on the way of automatic extension. SOLUTION: When an automatic extension switch 31 is operated, the jack operation controller 38a of a controller 38 operates a jack operating valve 37 to overhang jacks 22 automatically. When an emergency stop button 35 is pushed on the way of the automatic extension, the stop holding part 38b of the controller 38 stops the operation of the jacks 22, and at the same time, it maintains the operation stop of the jacks 22 regardless of the operating condition of the automatic extension switch 31 thereafter. And when jack operation knobs 34, 34,... are operated, the jacks 22 are made operative, regardless of the stopping and holding condition of the above jack operation.
|
