| 摘要 |
<p>A pneumatic circuit for a wheel mounted shovel wherein an air passage which extends through a swivel joint (23) of the wheel mounted shovel is communicated commonly with a parking brake device (2) and a suspension locking device (3) of the wheel mounted shovel. The pneumatic circuit comprises a solenoid operated control valve (19) communicated with a pressure source (13, 14) by way of a first air passage (30, 31). The control valve is communicated with a working/service brake device (1) by way of a second air passage (32, 33, 34). A third air passage (35, 36) is also connected to the control valve and is branched at a location on the downstream side of a swivel joint of the wheel mounted shovel into fourth and fifth air passages (37, 38, 39) connected to the parking brake device and suspension locking device, respectively. An electric circuit (27) is connected to the pneumatic circuit and includes a manually operable change-over switch (28) for controlling the control valve to selectively connecting the first air passage to either one or neither one of the second and third air passages. <IMAGE></p> |
