| 摘要 |
PURPOSE:To completely prevent foreign material to enter the cooling medium, by forming an enlarged section on the upper part of the cooling medium inlet opening, and by placing the packing for sealing between the end of the stopper and the enlarged section. CONSTITUTION:An enlarged section 10b is formed at the upper part of an inlet opening 10a of a metal bracket 10, and an internal thread 10c is made on the upper part of the enlarged section 10b. A packing for sealing 11 is placed in the enlarged section 10b and a stopper with an external thread 12 is screwed into the internal thread 10c. Thus, by placing the packing for sealing 11 between the enlarged section 10b formed at the upper part of the inlet opening 10a and the end of the external thread 12, the ground chips formed when the stopper with the external thread 12 is screwed onto the internal thread 10c of the metal bracket 10 is prevented from entering the cooling medium by the packing 11. Thus, the entrance of any foreign material to the cooling medium is completely prevented. |
