| 摘要 |
PURPOSE:To obtain a small-sized, lightweight and inexpensive pneumatic operation type 4-position switching unit by gathering an inversion unit and a brake switching unit in one unit. CONSTITUTION:When a power drive command is outputted to a reverse brake position RB in the prescribed state, a solenoid valve 26 and a lock coil 28 are excited through a cam switch 23. When the lock coil 28 is excited, the engagement of a connecting cam 29D of an operation lever 29 with a lock lever 30 is disengaged. Compressed air is supplied through an air inlet A to the cylinder chamber of upper part by the energization of the valve 26, a piston rod 13 is depressed, and a cam shaft 17 is rotated clockwise. When the shaft 17 is rotated to a position slightly before a reverse drive RP, a cam switch 23 is turned OFF, the valve 26 and the lock coil 28 are accordingly demagnetized, the lever 30 is engaged with a connecting cam 29c and stopped. |
