| 摘要 |
A door hinge device applicable to a door, comprising a pair of flanges, a cylinder connected to one of these flanges and housed with a pair of pistons, a valve means formed on one of the pistons, a partition mounted between the flanges, an orifice formed on the partition, and a driving mechanism mounted externally of the cylinder, wherein the antiflow valve means is opened when the flanges move in the direction to open the door, but when they move in reverse direction to close the door, the valve means of the piston controllably permits a desired quantity of working oil to flow therethrough.
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