| 摘要 |
PURPOSE:To provide an optimum stiffness in terms of a construction and makes a completely contractile operation by setting an order of rates at stretching and making a simultaneous contraction by use of a contained oil at contracting. CONSTITUTION:An oil chamber 8 at the first stretching side and an oil chamber 9 at the second contraction side are communicated. Inside a piston 6, a valve 25 which allows an oil to flow into the chamber 8 and checks its reflux is disposed on the way of an oil passage to the chamber 8 and a valve 20 which closes said oil passage is disposed on the way of an oil passage to an oil chamber 10 at the second stretching side. A valve 30 which allows a lean quantity of the oil to flow into the chamber as well as its reflux is disposed on the way of the oil passage toward the chamber 10. A valve 34 which opens the oil passage at the terminal of contraction of a cylinder 11 is disposed on the way of an oil passage which communicates the chamber 9 with the chamber 10. |
