초록 ▼

A suction pump which includes a valving member including a one way check valve, a cylinder and sliding cup seal connected to said check valve so that a negative pressure can be developed by the pump. The valving member includes a valving seat, a valving ball, and a plurality of biasing leaflets. The

A suction pump which includes a valving member including a one way check valve, a cylinder and sliding cup seal connected to said check valve so that a negative pressure can be developed by the pump. The valving member includes a valving seat, a valving ball, and a plurality of biasing leaflets. The valving body less the ball is preferably formed as an integral elastomeric body. The seal makes a sliding seal in the direction of evacuating movement, and deflects to permit air to by-pass it in the other direction.

대표청구항 ▼

A suction pump comprising: a valving member having a body with a passage therethrough said passage having a peripheral axially extending wall, and comprising: a valve seat in said passage; a valve ball in said passage adapted to move against and away from said seat, said ball having lateral dimensio

A suction pump comprising: a valving member having a body with a passage therethrough said passage having a peripheral axially extending wall, and comprising: a valve seat in said passage; a valve ball in said passage adapted to move against and away from said seat, said ball having lateral dimensions less than those of the passage, a leaflet on said body and in said passage so shaped and disposed and resiliently bearing against said valving ball as to trap it and hold it against said valve seat in the absence of a sufficient fluid force in said passage immediately downstream from said valve seat to displace the valve ball from the valve seat, said body and leaflet being made of elastomeric material, integral with one another, and inherently flexible and resilently resisting said displacement so that the leaflet must be deformed for the ball to leave the seat; a cylinder having an internal cylindrical wall, said cylinder being attached to said valving member and communicating with said passage; a cup seal in said cylinder having a flexible flange in sliding contact with said cylindrical wall and being sufficiently flexible as to deflect to permit passage of air in one direction of seal movement, and sufficiently shape retaining to make a sliding fluid-tight seal when moved in the opposite direction; a plunger rod connected to said cup seal; and a structure fitted to the other end of said cylinder guiding and passing said rod.