| 摘要 |
<p>PROBLEM TO BE SOLVED: To reduce processing manhours and the number of part items by a metal mold, by manufacturing first and second connection pieces respectively formed in the same shape and also becoming the substantially same external shape as a bowl part by uniting, by a single molding metal mold.SOLUTION: An operation chain 11 for fixing a plurality of bowl parts 13 at an interval to a single code part 12, is formed in an endless ring shape by connecting its both ends by a connection member 20. The connection member is composed of a first connection piece 21 having a substantially U-shaped first connection body 21a and installing a base part on one end of the operation chain and a second connection piece 22 having a substantially U-shaped second connection body 22a and installing a base part on the other end of the operation chain and formed in the same shape as the first connection piece. The tips of the first and second connection pieces are mutually opposed, and when the first and second connecting pieces are engaged and united in a state of rotating the first or second connection piece by 90 degrees around the axis of the code part, external shapes of the first and second connection pieces are constituted so as to become the substantially same shape as the external shape of the bowl part.</p> |
