| 摘要 |
<p>A fixed casing and a rotatable drum define an annular housing, in which a flexible pipe can be wound. The annular housing is provided with an inner opening for the passage of one end of the pipe and with an outer opening for extraction of the other end of the pipe. The casing and the drum are rotatably connected by a hollow axial pin shaped as a pipe fitting and suitable for connection, on one side, to said one end of the pipe and, on the other side, to a further pipe for connection to a water supply.</p> |
