| 摘要 |
<p>Several devices have been designed for picking up liquids or foams from surfaces. A typical device for domestic use is attached to a standard vacuum cleaner which provides the suction to draw up the liquids or foams. h problem has been to prevent liquids, and particularly foams, from entering and damaging the attached vacuum cleaner. Traps have been designed, but while these work well with liquids, no cheap, foolproof device for domestic use that will work with foam has been designed. A problem is to design a relatively cheap device that will detect the level of foam inside a trap and has a sufficient safety factor for improper use or foam build-up within the trap. A detecting float is provided which links to a remote plug. As the float rises in response to liquids or foam level, the plug is moved into an opening thereby cutting off the suction to the trap. A baffle is situated within the trap and positioned to control foam build-up. The float, baffle and suction tubes are so arranged that liquid or foam is unlikely to impinge on or build up on the float to impair its sensitivity. To prevent overload on the vacuum cleaner, a flap is moved automatically to open a relief path of air to the vacuum cleaner. The links between the float and the plug are connected to the float so that the mechanical advantage easily overcomes frictional and gravitational forces.</p> |
