| 摘要 |
<p>A drawing device (1) includes an outer body (2) provided with a screw thread (20) which defines a helical outer flow control surface (10) and forms the outer shell of the device, an intermediate body (3) provided with a screw thread (30) which defines an inner flow control surface (9), an inner body consisting of a sleeve (4) made of an elastomeric material and having an internal chamber (70) which forms the main supply system, a weight arranged in said chamber (70), and a drawing nib (7) with a wire (16) sliding therein which is fastened to a weight.</p> |
