| 摘要 |
<p>A pump and metering apparatus, comprising a frame supporting a liquid container with a movable plunger therein for discharging respectively drawing in liquid, the plunger being connected to a runner means (17), which by a nut portion (16) thereof threadedly engages a screw (6) rotatably mounted in the frame and coupled to a driving motor. According to the invention the nut portion (16) of the runner means (17) is movable in relation to the remaining structure of the runner means (17) in the radial direction of the screw (6), such that the nut portion (16) will be self-centering on the centre axis of the screw.</p> |
