| 摘要 |
<p>A nozzle for a pump comprises an inner tube (18) and a housing (1, 10) with an end wall in which is formed an elliptical outlet (13). The tube (18) is provided with an elliptical opening (21). The outlet and opening are off centre and can be brought into registry by rotating the tube (18). Such rotation is effected by means of a sleeve (22) mounted on the housing, connected to the tube (18) by means of a slot (35) receiving a projection (29) on the tube. The sleeve is rotated by means of an axially movable cam follower engaging in a part helical cam surface (24).</p> |
