Pump assembly of non-metal pump type cosmetic container

A pump assembly of a non-metal pump type cosmetic container, the pump assembly comprising:

• a connection nozzle connected to the inside of a container main body having a cylindrical shape in which a gel-type or liquid material is accommodated, such that a fluid is movable, the connection nozzle including an accommodating space where a material introduced from the container main body via pumping temporarily stays;
• an installation cap coupled to the container main body when the connection nozzle is supportably mounted on the installation cap, and arranged to surround the connection nozzle;
• a discharge cap provided to vertically ascend or descend along an inner circumferential surface of the installation cap, the discharge cap including an outlet that communicates with the connection nozzle such that the material is discharged to the outside;
• a piston unit having one side connected to the discharge cap to ascend or descend together with the discharge cap, and the other side provided to be able to ascend or descend within the accommodating space of the connection nozzle, the piston unit including therein a discharge passage communicating with a discharge passage of the discharge cap and a communication hole that enables selective communication between the discharge passage and the accommodating space of the connection nozzle while ascending or descending together with the discharge cap;
• and
• an elastic pump arranged between the discharge cap and the connection nozzle, the elastic pump comprising an elastic material to restore the discharge cap descending together with the piston unit to an original location, the elastic pump comprising:
• an upper end supportably provided on an upper end of the piston unit;
• a lower end supportably provided on an upper end of the connection nozzle;
• a first portion in close contact with an exterior surface of the piston unit;, and
• a second portion connected to the first portion, the second portion comprising an internal surface shape forming a deformation gap for smooth deformation between an internal surface of the second portion and upper and lower portions having the deformation gap therebetween closely contact the exterior surface of the piston unit.