| 摘要 |
A pneumatic ejector comprises a rigid support member 18 having a base portion 20 and an upstanding boss 21 integral with the base portion, and an elastomeric ejection element 19 having a diaphragm portion 27 and a skirt portion 28 surrounding the diaphragm portion and secured to the boss. The support member 18 has an air inlet passage 22 for supplying air under pressure to move the diaphragm away from the boss. The upper end of the upstanding boss may be concave and the diaphragm may be of complementary shape. The diaphragm may have an integral protrusion 29 upstanding from a central region of the diaphragm. Additionally or alternatively, the diaphragm may have an integral protrusion 30 which depends from a central region of the diaphragm and which extends into a through bore 23 in the upstanding boss, the through bore communicating with the air inlet passage in the support member. <IMAGE> |
