| 摘要 |
PROBLEM TO BE SOLVED: To enlarge a force for holding a door in a half-opened position and a full opened position and reduce an opening/closing operating force by forming a rising part of an arc projecting face and raising it from the bottom of a lock recess as drawing a projecting arc curve. SOLUTION: When a door is moved from a full opened state in the closing direction, sliding parts 22a, 23a of shoes 22, 23 are forwarded while climbing over a projection 13b of an arm 13 inversely in a case of the opening direction and returned to the full closed position via a half-opened position. Then, the sliding parts 22a, 23a of the shoes 22, 23 touch an arc projecting face 13hR so that, as the door approaches to the half opened position or the full opened position, the inclination in the contact position with the shoes 22, 23 on the arc projecting face 13hR becomes steep. On the other hand, when the door is separated from the half opened position or the full opened position, the inclination face 13h in contact with the shoes 22, 23 becomes an inclination plane 13hL, or a gentle slope, so that only a small opening/closing operating force is required therefor.
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