Patent ID: 9605690
Date: 2017-03-28
CPC Classifications: F15B

Claim:
1. A hydraulic system comprising: an actuating cylinder and an accelerating cylinder, the actuating cylinder and the accelerating cylinder each including, a first switch valve, a second switch valve, and a third switch valve switching a circuit for unloaded condition and a circuit for loaded condition; a supply/discharge line being a source of oil supply; and a bottom line allowing connection between the bottom-side section of the accelerating cylinder and the bottom-side section of the actuating cylinder, wherein when the rod of the actuating cylinder is extended in unloaded condition, based on a setting of the first switch valve and the second switch valve, a circuit is configured such that oil is supplied from the supply/discharge line to the rod-side section of the accelerating cylinder and oil discharged from the bottom-side section of the accelerating cylinder is supplied to the bottom-side section of the actuating cylinder through the bottom line, when the rod of actuating cylinder is extended in loaded condition, based on a setting of the first switch valve and the second switch valve, a circuit is configured such that oil from the supply/discharge line is supplied to the bottom-side section of the actuating cylinder without passing through the accelerating cylinder, and the first switch valve and the second switch valve switches the circuit for unloaded condition to the circuit for loaded condition by switching a setting of the third switch valve based on a pressure in the bottom line.