Animal feeding apparatus and method using same

An animal feeding apparatus, comprising a base integrally formed with a handle protruding thereon and away from a reservoir for one-hand holding, and the reservoir coaxially connected to an end of the base and detachably coupled with the base via a threaded connection, the reservoir configured to accommodate medium and comprising a port away from the base, wherein, the medium is driven into or out of the reservoir through the port;

• the base comprising a first cavity communicating with the reservoir, and a second cavity adjacent to and communicating with the first cavity, the animal feeding apparatus further comprising:
• a piston moveably positioned in the first cavity, and having a first force end away from the reservoir and extending out of the first cavity, a pushrod being provided with a first toothed rack on an outer surface thereof;
• an activator movable positioned in the second cavity, and having a second force end away from the reservoir and extending out of the second cavity, a link rod being provided with a second toothed rack on an outer surface thereof;
• and
• an linkage member integrally formed between the first cavity and the second cavity, the linkage member comprises a separator fixed inside the base and separates the first cavity from the second cavity, and a guiding gear rotatably positioned on the separator and rotatable around an axis perpendicular to moving directions of the piston and the activator, the first toothed rack and the second toothed rack both meshing with the guiding gear, and the linkage member configured to engage with the piston and the activator and guide the piston and the activator to move in two opposite directions;
• wherein,
• the first force end and second force end are configured to alternatively get pressed to drive the piston to get the medium to move out of the reservoir, or to drive the activator to get the medium to move into the reservoir from a medium supply source.