| abstract |
A fluid dispenser with a novel component is provided. A fluid dispenser 110 for use with a fluid supply 170 is mounted to reciprocate forward and backward within the dosing chamber 120, seal the dosing chamber wall and slide over it. The dosing chamber can be filled with fluid from a fluid source by sliding the piston backward and sliding in front of the piston by sliding the piston forward. The fluid is pumped out of the dosing chamber and, in use, the seal is adapted to seal the dosing chamber away from contact with it during backward sliding, so that the fluid Can flow past and into the dosing chamber in front of the piston. [Selection] Figure 3B |