| 摘要 |
<p>PROBLEM TO BE SOLVED: To prevent flanges from running out from each other in case of a connection work by forming, in a vacant chamber, one projection which extends from one flange towards the other one and prevents the eccentricity of both flanges. SOLUTION: A contact face of a flange 20 of a drawer container 4 is projecting inward along the entire circumference and forms a projecting section 20a. On the other hand, a contact face of a flange 21 of a relay container 8 is projecting outward along the entire circumference and forms a projecting section 21a. A space formed by the projecting sections 20a and 21a constitutes a vacant chamber 15. A plurality of projections 21b, each of which is projecting in the vacant chamber 5 towards the projection 20a with its end being drawn close to the projection 20a for preventing the eccentricity of the flanges 20 and 21, are formed at equal intervals along the circumference. By this method, the flanges 20 and 21 are prevented from running out from each other at the time of a connection work.</p> |
