| 摘要 |
1,019,497. Molecular vacuum pumps. SOC. NATIONALE D'ETUDE ET DE CONSTRUCTION DE MOTEURS D'AVIATION & COMMISSARIAT A L'ENERGIE ATOMIQUE. May 15, 1964 [June 5, 1963], No. 20393/64. Addition to 1,019,272. Heading F1C. In the disc for a molecular vacuum pump described in the parent Specification, the blades are inclined relatively to the plane of the disc at an angle between about 12 degrees and about 28 degrees, and the holes formed at the end of each slot to prevent spreading of the slots into the material of the disc are inclined in the same general direction as the blades but at an angle between about 35 degrees and about 45 degrees relatively to the plane of the disc and therefore at an angle to the blades. |
