Brake safety device for wheel type hydraulic shovel

Abstract

Abstract PURPOSE:To permit to brake upon running even under the trouble of a shuttle valve by a method wherein an automatic switching valve, capable of being switched into an interrupting condition in cooperating with the motion of a brake valve for running which is switched to the side of braking, is provided in a pipeline between a brake valve for working and the shuttle valve. CONSTITUTION:A pressure air tank 6, reserving pressure air from a compressor 5 driven by a prime mover, is connected to respective input ports of the brake valve 9 for running, which can be switched by a brake pedal 8, and the brake valve 11 for working, which can be switched by a brake lever 10, respectively through an air feeding pipe 9. The output ports of respective brake valves 9, 11 are connected to the cylinders 16 of respective braking devices B through the shuttle valve 14 and a pressure introducing pipeline 15. Further, a two-position two-port switching valve 21 is interposed on an air introducing pipe 13 between the brake valve 11 for working and the shuttle valve 14. The switching valve 21 is constituted so as to be switched to the valve closing position (b) by the pressure air supplied into the pilot chamber thereof upon switching the brake valve 9 for running to the side of braking.

Inventors

• 👤 Junichi Hosono
• 👤 細野　純一
• 👤 Seiji Tamura
• 👤 誠二 田村
• 👤 Saburo Yoshio
• 👤 三郎 吉尾

Bibliographic Details