| 摘要 |
<p>A wire (4) is connected, on the outer side of a vertical line extending through the center of gravity (G) of a movable panel (2), to a lower portion of the movable panel (2). With reference to the movable panel (2), when a force (F) acts, by an abutting portion (11a) formed at a side plate (44a) of the movable panel (2), a reaction (-Fx) is caused to act on the abutting portion (11a) from a supporting plate (42a) against a horizontal component (Fx) of the force (F) so that those forces cancel each other. In short, what acts on the movable panel (2) is a vertical component (Fy) only so that the component (Fy) generates the moment of a force to turn the movable panel (2) inward on the center of gravity (G). As a result, a clearance (14) is always formed to keep the outer face of a flat plate (29) and the inner face of a flat plate (28) out of contact, so that the outer face of the movable panel (2) is hardly damaged.</p> |
