| 摘要 |
PURPOSE:To obtain a sure and stable retaining power by retaining the gas spring through blockade of an oil chamber at the stetched-out position of a piston rod in the gas spring used for opening and shutting back doors of an automobile and the like. CONSTITUTION:When the gas spring is released from the compressed state, a piston 2 and the piston rod 3 operate in the direction of extension by the pressure of the gas inside a gas chamber, and at this time, the operating oil in an oil chamber A, Which shrinks, flows to an oil chamber B through a passing hole 8A. And, when the length of the piston rod 3 projected outside approaches the maximum length thereof, a spring guide 11A contacts with a cushion for 5. After that, a spring guide 11B, compressing a spring 12 with the load of the gas spring, soon contacts with the spring guide 11A, whereby the operation of extension is completed. Under the condition, by the counter force of the spring against the compression, a nonreturn valve 10, which should be opened freely in the direction of the side of shrinkage of the rod, is closed and retained in the state. |
