Patent ID: 8465450

Claim:
A breast pump with a piston suction arrangement, comprising: a casing ( 3 ); a base ( 4 ) provided on said casing and comprises a gear shaft ( 5 ) provided thereon; a piston unit for providing suction, and comprises: a handle ( 1 ) mounted to said base and extended outside said casing and arranged for pressing; a cylinder member ( 12 ); a piston member ( 19 ); a toothed member ( 17 ) connected to said piton member; and a gear unit operatively connected with said toothed member ( 17 ) and said handle ( 1 ) such that said toothed member and said handle are connected such that a reciprocating movement of said handle in an up and down direction is changed into a reciprocate movement of said piston member at a back and forth direction, wherein said gear unit comprises a first gear ( 6 ) mounted on an exterior end of said gear shaft ( 5 ), a second gear ( 7 ) operatively connected to said first gear for serving as an intermediate gear, and a third gear ( 10 ) having a diameter smaller than a diameter of said first gear and cooperatively connected to said first gear through said second gear by gear transmission, and a fourth gear ( 17 ) having a diameter which is larger than said third gear coaxially positioned with said third gear while in gear connection with said toothed member ( 17 ); and a third shaft member rotatably supporting said third gear ( 10 ) and as resilient member ( 14 ) provided on a protruded end portion or said third shaft member.