| 摘要 |
FIELD: personal use articles.SUBSTANCE: vacuum cleaner head comprising: a pressure chamber (176) comprising a first part (194) of the chamber and a second part (196) of the chamber which is movable relative to the first part (194) of the chamber, in response to pressure differential from different sides of the chamber, from the first position to the second position; and a control mechanism (214, 238) located inside the pressure chamber (176). The control mechanism (214, 238) has a first state to restrain movement of the second part (196) of the chamber in response to the said pressure differential for the third position which is intermediate between the first and the second positions, and the second state, which enables the second part (196) of the chamber to move in response to the said pressure differential to the second position. The control mechanism (214, 238) is made with the ability to change its state between the first and second states in response to movement of the second part (196) of the chamber from the third position.EFFECT: invention may enable the pressure chamber to switch between different configurations by changing the pressure difference on different sides of the second part of the chamber, for example, to raise or lower the part of the cleaning head, or to activate or deactivate selectively the shaking device.17 cl, 30 dwg |
