| 摘要 |
The positive displacement pump delivers the products uniformly and with a low force to actuate the pump. The uniform delivery results from a close slideable fitting of the upper part (16) into the lower part (12). A low force to actuate is accomplished in part by reduced surface area contact of the upper portion and lower portion during slideably interfitting operation. This is accomplished preferably by having transverse ribs (18) on the exterior surface of the upper part and longitudinal ribs (34a, 34b) on the interior surface of the lower part. Further, there is a locking mechanism between an upper part shroud and rams located in the lower part. The locking mechanism controls the movement of the reusable shroud. Additionally there are reinforcing ledges (51, 53) on the lower region of the upper shroud and on the upper region of the lower shroud. The reinforcing ledge on the upper shroud can extend to comprise a floor on the upper shroud. |
