Patent ID: 6655556
Filing Date: 2003-12-02
Classification: A47K,B05B,G01F

Abstract:
A dispensing device, comprising:a stationary base part, and a mobile assembly which can move with respect to the base part and defines therewith a variable-volume pumping chamber, the mobile assembly comprising: a piston mobile between two extreme positions, the piston comprising: at least one intake passage allowing the pumping chamber to be filled, and a control member, secured to the piston, passing through the stationary base part and being equipped with at least one outlet passage allowing product contained in the pumping chamber to be dispensed, the control member being mobile with respect to the piston between a dispensing position and a filling position, the control member comprising: a first drive means configured so as to collaborate with the piston when the control member is in the dispensing position, so as to drive it along in a direction corresponding to a reduction in the volume of the pumping chamber, a second drive means configured so as to collaborate with the piston when the control member is in the filling position, so as to drive it along in a direction corresponding to an increase in the volume of the pumping chamber, wherein: â€ƒthe piston comprises shut-off means for shutting off the outlet passage when the control member is in the filling position, and â€ƒthe control member comprises shut-off means for shutting off the intake passage when the control member is in the dispensing position, and â€ƒwherein the base part is configured so as to create a friction between the piston and the base part when the volume of the pumping chamber is minimum, and an absence of friction or a smaller friction when the piston is in an intermediate position between the extreme positions.