| 摘要 |
<p>A manually operated dispenser for dispensing a predetermined amount of powdered substance comprises a pressure cylinder (2) with an axially displaceable piston (3). A superatmospheric pressure is generated by displacing the piston inwardly in the cylinder and is releaved through a chamber (41) in a magazine (40) comprising a number of chambers (41) containing powdered substance. The ends of the chambers (41) are covered by penetrable membranes, and the chambers (41) may be moved to successively being in alignment with a penetrator (30) and an outlet pipe (46). When the piston (3) is in its innermost position the penetrator (30) and the inlet end of the outlet pipe (46) are forced through the respective membranes at the ends of the chamber (41), and the subatmospheric pressure is releaved through the chamber (41) to dispense its content through the outlet pipe (46). The magazine (40) is annular and comprises a number of tubular chambers (41) placed equidistantly at some distance from and parallel with the axis of the magazine (40). At each full displacement of the piston (3) the magazine (40) is rotated to bring a new chamber (41) in alignment with the penetrator (30) and the outlet pipe (46).</p> |
