Pump for bottle

Abstract

A pump for a bottle is disclosed. The pump comprises a lid for being assembled to a mouth of the bottle, a shell settled inside the lid, a drawing tube connected to a lower end of the shell with a one-way valve settled therebetween so that contents in the bottle can be drawn into the shell through the drawing tube and retained from reversely flowing back to the bottle, a pressing head for controlling a piston tube to axially shift in the lid and the shell, an elastic member settled in the shell so as to axially deform and resile in responding to the axially shifting piston tube so that the contents in the bottle can enter the shell through the one-way valve and be extruded into the piston tube through a radial hole so as to be expelled at an outlet of the pressing head.

1 . A pump for a bottle, comprising:
 a lid, for being combined with a mouth of the bottle;   a shell, having an upper end thereof airtightly assembled with an inner surface of the lid and having a lower end thereof connected to a drawing tube extending into the bottle, in which a one-way valve is provided between the drawing tube and the shell;   a piston tube, which is capable of axially shifting along an axis of the lid, and has an axial hole and at least one radial hole communicate with the axial hole, in which a section of the piston tube having the radial hole is pierced into the shell;   a pressing head, fixed at an upper end of the piston tube and having an outlet communicated to the axial hole; and   an elastic member, which is made of a flexible material so as to repeatedly deform and resile in responding to the axially shifting piston tube so that contents in the bottle enters the shell through the one-way valve and enters the axial hole of the piston tube through the radial hole to be expelled at the outlet of the pressing head.   
   
   
       2 . The pump of  claim 1 , wherein, the elastic member comprises a neck and a body that are coaxially and integrally formed, in which the neck is mounted around and fixed to the section of the piston tube pierced into the shell and normally blocks the radial hole while the body has an outer surface abutting an inner wall of the shell and has an inner space. 
   
   
       3 . The pump of  claim 2 , wherein, when the elastic member axially moves downward along the piston tube, the elastic member performs a first deformation and a second deformation. 
   
   
       4 . The pump of  claim 3 , wherein, the first deformation is presented at the neck to cause the radial hole of the piston tube to appear in the inner space of the body. 
   
   
       5 . The pump of  claim 4 , wherein, the first deformation is an axial compression of the neck. 
   
   
       6 . The pump of  claim 5 , wherein, the neck comprises at least one annular reduced section. 
   
   
       7 . The pump of  claim 3 , wherein, the second deformation is presented at the body to cause the inner space to get compressed and pressurized. 
   
   
       8 . The pump of  claim 7 , wherein, the second deformation is an axial compression of the body. 
   
   
       9 . The pump of  claim 8 , wherein, the body comprises at least one annular reduced section. 
   
   
       10 . The pump of  claim 2 , wherein, the piston tube has a pressing head connecting portion and an elastic member connecting portion that are coaxially and integrally formed, in which the pressing head connecting portion is connected to the pressing head while the elastic member connecting portion is connected to the neck of the elastic member and the axial hole passes through the pressing head connecting portion and the elastic member connecting portion while the radial hole is arranged at the elastic member connecting portion. 
   
   
       11 . The pump of  claim 1 , wherein, the lid, the piston tube and the shell are made of a plastic material. 
   
   
       12 . The pump of  claim 1 , wherein, the one-way valve is made of a plastic material.