| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a hydraulic hinge and a spring hinge of a door opening and closing device as a pair; to smoothly operate the hydraulic hinge without clogging with oil; to enable the spring hinge to have great compressive tension. <P>SOLUTION: The hydraulic hinge has an oil outflow part on the upper surface of a cylinder, with a number of supporting protrusions formed on the oil outflow part so that an orifice is in communication with an oil circulation path. The spring hinge is constituted by having a built-in spring fixed in place at its upper end and fastened at its lower end to a lift which rises and falls while rotating, so that the spring hinge has greater compressive tension. <P>COPYRIGHT: (C)2004,JPO |
