Patent ID: 6354820
Filing Date: 2002-03-12
Classification: F04B

Abstract:
A pump comprising:an approximately rectangular parallelepiped cylinder with a long width, a short width and a depth; an intake port and an outlet port opening on said cylinder; a piston inserted into said cylinder via said opening portion with a thickness similar to said short width of said cylinder, a first width shorter than said long width of said cylinder, a second width longer than said depth of said cylinder; a pair of projecting portions extending outward from approximately centers of surfaces along said second width and having arc surfaces coming in contact with inner surfaces of said cylinder, respectively; a pump chamber defined by said cylinder and said piston; and a driving means for causing reciprocating motion and oscillating motion of said piston relative to said cylinder; wherein said intake port and said outlet port are closed by said piston when said piston is located at an upper dead point and a lower dead point; and wherein said driving means causes said reciprocating motion of said piston relative to said cylinder to vary capacity of said pump chamber and causes said oscillating motion of said piston relative to said cylinder to open said intake port and said outlet port alternately.