| 摘要 |
In a suction cleaner comprising a casing (2), a suction pipe (1) rotatably mounted in the casing and indicator (11) to indicate how full of dust a dust receiving bag or chamber of the cleaner is by reference to the suction pressure in the pipe, an annular chamber (3) is provided around the rotatable suction pipe and between it and the cleaner casing, the annular chamber being in communication with the pipe via bore (8) and with the indicator via bore (10). <IMAGE> |
