PUMP WITH SPRING DRIVE FOR INDIVIDUAL FLUID EMISSIONS Russian patent published in 2018 - IPC A61C17/02 

FIELD: personal demand items.

SUBSTANCE: oral care device comprises a device body, an elongated transitional portion and a spout, a fluid reservoir and a pump assembly to deliver individual fluid discharges to the junction and spout assembly. The pump assembly includes a pump body, an inlet/outlet assembly for fluid at the front end of the pump assembly, a cylindrical piston sleeve with a central hole, a piston assembly having a central portion including a fluid impermeable insulator at its front end, a central bore of the piston bushing, a compressible spring disposed between the front end of the piston assembly and the rear end of the housing, and a drive mechanism. The drive mechanism includes a rack and pinion assembly having a toothless portion, the drive mechanism being controlled by an actuator driven by the motor to move the piston assembly and then release it. The inlet/outlet assembly includes a one-way fluid inlet valve and a one-way fluid outlet valve communicating with the central opening of the piston sleeve. During operation, the drive mechanism moves the piston assembly back until the drive mechanism reaches the preselected position, draws the fluid into the piston sleeve, and then releases the piston assembly, pushing the liquid out through the inlet/outlet assembly to the junction and spout assembly, forming a single fluid ejection.

EFFECT: invention allows to create individual discharges or fluid portions in the hand-held device due to the pump design features.

8 cl, 4 dwg