| 摘要 |
The length adjusting embodiments of an automatic driving means are provided to achieve a desired length in an exact and convenient way under the telescopic operation of suction pipe by an automatic means (B), the suction extension pipe to a desired length in a fast and precise manner wherein the adjusted length can be stably kept against external impacts, and the length adjustment of a suction extension pipes can be simply achieved by means of the switching operation using a finger. According to an embodiment under the present invention, a tooth-coupling mechanism for telescoping the suction extension pipe using a pinion (10) and a rack gear (6) is developed in accordance with the embodiment of the automatic driving means , and another embodiment according to the present invention, a screw-coupling mechanism for telescoping the suction extension pipe using a screw bar (2) and female screw is devised in accordance with the embodiment of the automatic driving means. |
