| 摘要 |
<p>A cylinder (1) which has one or several chambers, filled with semi-liquid substances, has a central rod (2) with ratchet teeth (3). The piston (4) at the inner end of the cylinder is engaged by the toothed rod (2). The outside end of the rod has a collar plate (5) which is axially spring loaded (7) away from the cylinder. To dispense liquid through nozzles (13) at the top of the cylinder (1), the central rod is pressed into the cylinder against the spring. When released, the spring force pulls the piston up the cylinder by means of the ratchet teeth.</p> |
