| 摘要 |
PURPOSE:To prevent a work car from occurrence of sticking and to get rid of defective operation of a brake by omitting shuttle valve in the brake circuit of a work car. CONSTITUTION:In the brake circuit, while both of respective valves 30 and 31 for running and working are left inoperative in a switching position D, the pressurized air from an air source 1 is intercepted at the respective valves 30 and 31 for running and working to hold the operation of a brake mechanism 15. Switching of the brake valve 30 to a switching position U transmits the air pressure to an air chamber 12b through a piped path 1a, the valve 30, a piped path 32, the valve 31, and a piped path 33 to brake wheels. And switching of the brake valve 31 for working to the switching position U transmits the air pressure to the air chamber 12b through the valve 31, the piped path 1a, the valve 31, a pilot piped path 34, a check valve 36, and a bypass circuit 35 to brake the wheels. |
