| 摘要 |
PURPOSE:To perform the operation work of a switchboard safely by regulating the opening angle of two hinge segments to be opened or closed mutually. CONSTITUTION:At the time of closing a door 2, a hinge 3 closes its two hinge segments 31 and 32 to close the door 2 regardless of protrusions 35a and 35b. At the time of opening the door 2, the two hinge segments 31 and 32 separate from each other along with the opening of the door 2, and approach the protrusions 35a and 35b respectively. At a position of a specified opening angle theta, a hinge segment 31 touches a protrusion 35a and the hinge segment 32 touches the protrusion 35b preventing the door from opening any more. Accordingly, the door does not open wider than the opening angle theta, and the opening angle is regulated only by putting a washer 35 inside. Consequently, it becomes possible to exclude members interfering with the operation of a case front, and perform the operation work of a switchboard safely. |
