TW200516035A - Lotion and cream pump - Google Patents

Abstract

This invention of lotion and cream pump includes: an air cylinder equipped with a downward check valve on its bottom; a piston crown provided with out stretching shoulder bottom; a piston of upward check valve comprising of an inner ring, an outer ring, and the above-mentioned piston crown; a press head fix-connected to the top of the piston crown; and a spring set between the bottom of the piston crown and the downward check valve. A lug forms at the periphery of the bottom shoulder of the piston crown, a first bevel provided inside the lug, a bevel provided on the outside bottom of the inner ring of the piston. When the piston crown contacts the piston, the first bevel of the piston crown accordingly seamlessly contacts the above-mentioned piston bevel. Or, a second bevel provided outside the lug top, a bevel provided on the inside bottom of the inner ring of the piston, thus when the piston crown contacts the piston, the second bevel of the piston crown accordingly seamlessly contacts the above-mentioned piston bevel. Mechanisms mentioned above improves airtight effect of the upward check valve so that the lotion and cream pump is capable of pumping out liquid or cream even when the cream liquid is sticky and dense.