Piston mechanism of a lotion pump

Abstract

The present invention provides an improved piston mechanism of a lotion pump. A piston is assembled in the piston cylinder of the lotion pump in a sliding state. The piston contacts the inner wall of the piston cylinder through a ring surface. At least two circular ribs are arranged at intervals on the ring surface, enabling sliding contact between each circular rib and the inner wall of the piston cylinder. Since the circular rib is made of ribs with predefined heights, the contact area may not expand greatly, thus maintaining the smooth sliding of the piston, leading to higher durability and improved applicability of the lotion pump.

1 . A piston mechanism of a lotion pump, comprising:
 a piston cylinder having a piston assembled in said piston cylinder, said piston being slideable within said piston cylinder, said piston being in contact with an inner wall of said piston cylinder through a ring surface; and   at least two circular ribs arranged at intervals on said ring surface, enabling sliding contact between each circular rib and said inner wall of said piston cylinder.   
   
   
       2 . The piston mechanism defined in  claim 1 , wherein each circular rib is available with trapezoidal, semicircular and pyramidal cross-sections.