| 摘要 |
PROBLEM TO BE SOLVED: To release locking of a cover even if a square engaging groove is slightly out of position in a previous step or on the way from the previous step. SOLUTION: A T-shaped key 14c is comprised of a head 141 and a neck 142 as a rotary shaft of the head 141, and the head 141 is provided with four inclined sides 143 that become smaller in width and inclined toward the tip from the center of the both sides in the lengthwise direction. In addition, the T-shaped key 14c is provided with a chamfered part 144 on the tip side of the respective inclined sides 143. COPYRIGHT: (C)2004,JPO |
