Patent attributes
A negative pressure storage container includes a container cover, a container body, a rotary device, a gear transmission mechanism and a vacuum pump so arranged that rotating the rotary device drives a driving gear of a transmission gear set of the gear transmission mechanism to rotate an eccentric wheel, causing a link to reciprocate a reciprocating piston of a vacuum pump in creating a negative pressure in the container body. When the negative pressure reaches a certain level, the bottom wall of a plastic inner cover member of the container cover is forced to curve and to carry the driving gear away from the rotary device; at this time, and thus, the rotary device runs idle at this time, preventing overloading the transmission gear set and prolonging the service life of the gear transmission mechanism.
