Patent ID: 6264439
Filing Date: 2001-07-24
Classification: A61M,F04B,Y10T

Abstract:
An electromagnetic pump comprising:a) a housing having an interior fluid containing region including a fluid receiving chamber and a fluid output chamber in fluid communication therewith, an inlet in fluid communication with said receiving chamber and an outlet in fluid communication with said output chamber;b) check valve means operatively associated with said fluid containing region for allowing fluid flow in a direction from said inlet through said outlet and blocking fluid flow in a direction from said outlet through said inlet;c) electromagnet means carried by said housing and located external to said fluid containing region;d) an armature positioned in said fluid containing region of said housing having a pole portion located for magnetic attraction by said electromagnet means and having a plunger portion extending from said pole portion, said armature being movably supported in said housing for movement from a rest position through a forward pumping stroke when attracted by said electromagnet means to force fluid from said output chamber through said outlet and for movement in an opposite direction through a return stroke back to said rest position;e) said armature pole portion comprising a body of magnetic material having first and second oppositely disposed surfaces, said first surface being disposed toward said electromagnet means and said second surface having an integral annular flange extending therefrom and defining a recess therein;f) said armature plunger portion being elongated and having a formation on one end thereof, said formation being received in said recess and said annular flange being crimped onto said formation so that said armature pole portion and plunger portion are secured together; andg) means defining a magnetic circuit including said electromagnet means and said armature and a gap between said pole portion of said armature and said electromagnet means for moving said armature toward said electromagnet means to close said gap in response to electrical energization of said electromagnet means.