| CPC B05B 11/1074 (2023.01) [B05B 11/1023 (2023.01); B05B 11/1047 (2023.01); B05B 11/1077 (2023.01)] | 4 Claims |
|
1. A pump cap comprising:
a cylinder having an interior space configured to receive a content drawn thereinto;
a piston configured to move up and down within the interior space and having an inflow hole formed therein, the inflow hole connecting to the interior space;
a valve configured to move together with an upward and downward movement of the piston while maintaining contact with an inner perimeter of the cylinder and an outer perimeter of the piston, the valve capable of closing the inflow hole;
a rod coupled to an upper portion of the piston and having an inside thereof connecting with an inside of the piston, the rod protruding to an outside of the cylinder;
a shoulder coupled to an upper portion of the cylinder; and
an elastic member having one end thereof contacting the shoulder and another end thereof contacting the rod, the elastic member configured to provide an elastic force for pushing the rod upward,
wherein the elastic member comprises a flexible portion,
wherein the flexible portion comprises:
an upper non-corrugated tube;
a lower non-corrugated tube; and
a center corrugated tube provided between the upper and lower non-corrugated tubes,
wherein an outer diameter of an upper end of the upper non-corrugated tube is greater than an outer diameter of a lower end of the upper non-corrugated tube,
wherein an outer diameter of an upper end of the lower non-corrugated tube is less than an outer diameter of a lower end of the lower non-corrugated tube,
wherein a length of the center corrugated tube is less than lengths of the upper and lower non-corrugated tubes, respectively.
|