Pressure based sensing means for adjusting the height of an agitator in a vacuum cleaner head
First Claim
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1. A vacuum cleaner head for cleaning a surface comprising:
- (a) a casing having a dirty air inlet and an air flow path, the air flow path in fluid communication with a vacuum source;
(b) brushing means mounted above the dirty air inlet in the air flow path and movably mounted with respect to the dirty air inlet; and
,(c) a drive means for moving the brushing means to agitate the surface being cleaned, and(d) lift off means to move the brushing means with respect to the dirty air inlet in response to the air pressure in the air flow path at a position downstream of the dirty air inlet.
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Abstract
A vacuum cleaner head has a rotatably mounted brush and a pressure sensor which is drivingly connected to the brush to move the brush with respect to the dirty air inlet in response to the air pressure in the air flow path to the vacuum cleaner head.
49 Citations
31 Claims
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1. A vacuum cleaner head for cleaning a surface comprising:
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(a) a casing having a dirty air inlet and an air flow path, the air flow path in fluid communication with a vacuum source; (b) brushing means mounted above the dirty air inlet in the air flow path and movably mounted with respect to the dirty air inlet; and
,(c) a drive means for moving the brushing means to agitate the surface being cleaned, and (d) lift off means to move the brushing means with respect to the dirty air inlet in response to the air pressure in the air flow path at a position downstream of the dirty air inlet. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method of cleaning a surface using a vacuum cleaner head, the method comprising:
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(a) introducing dirty air into the dirty air inlet in the vacuum cleaner head, the vacuum cleaner head having an air flow path in fluid communication with a source of suction and a brush movably mounted in the vacuum cleaner head to agitate the surface being cleaned, the brush being positioned to contact a carpeted surface during normal air flow through the air flow path; (b) sensing the air pressure in the air flow path downstream of the dirty air inlet; (c) adjusting the position of the brush with respect to the dirty air inlet in response to variations of the air pressure in the air flow path from normal air flow; and
,(d) moving the vacuum cleaner head over the surface whereby the surface is cleaned. - View Dependent Claims (11, 12, 13)
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14. A vacuum cleaning head for cleaning a surface comprising:
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(a) a casing having a dirty air inlet for receiving an air flow, an air outlet and an air flow path extending between the dirty air inlet and the air outlet, wherein the air outlet is in fluid communication with a vacuum source; (b) a brush movably mounted in the casing between a first position and a second position, the first position being closer to the dirty air inlet than the second position, the brush being driveable when in any position with respect to the dirty air inlet to disturb dirt on the surface and assist in entraining dirt in air entering the air flow path; and
,(c) a pressure sensor drivingly connected to the brush to move the brush with respect to the dirty air inlet in response to the air pressure in the air flow path downstream of the dirty air inlet, the pressure sensor configured for the brush to be in contact with a carpeted surface which is to be cleaned during normal operating conditions and to raise the brush when there is a blockage in the air flow path. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23)
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24. A vacuum cleaning head for cleaning a surface comprising:
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(a) a casing having a dirty air inlet for receiving an air flow, an air outlet and an air flow path extending between the dirty air inlet and the air outlet, wherein the air outlet is in fluid communication with a vacuum source; (b) a brush movably mounted in the casing between a first position and a second position, the first position being closer to the dirty air inlet than the second position; and
,(c) a piston housing having a piston therein, said piston housing having an internal volume which changes due to a change in pressure in the air flow path, the piston is drivingly connected to the brush to move the brush with respect to the dirty air inlet in response to the air pressure in the air flow path downstream of the dirty air inlet.
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25. A vacuum cleaning head for cleaning a surface comprising:
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(a) a casing having a dirty air inlet for receiving an air flow, an air outlet and an air flow path extending between the dirty air inlet and the air outlet, wherein the air outlet is in fluid communication with a vacuum source; (b) a brush movably mounted in the casing between a first position and a second position, the first position being closer to the dirty air inlet than the second position; and
,(c) a pressure sensor comprising an electronically driven member drivingly connected to the brush to move the brush with respect to the dirty air inlet in response to the air pressure in the air flow path downstream of the dirty air inlet.
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26. A vacuum cleaning head for cleaning a surface comprising:
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(a) a casing having a dirty air inlet for receiving an air flow, an air outlet and an air flow path extending between the dirty air inlet and the air outlet, wherein the air outlet is in fluid communication with a vacuum source; (b) a brush movably mounted in the casing between a first position and a second position, the first position being closer to the dirty air inlet than the second position; (c) a main turbine positioned in the air flow path; and
,(d) a pressure sensor drivingly connected to the brush to move the brush with respect to the dirty air inlet in response to the air pressure in the air flow path downstream of the dirty air inlet.
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27. A vacuum cleaning head for cleaning a surface comprising:
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(a) a casing having a dirty air inlet for receiving an air flow, a housing movably mounted with respect to the dirty air inlet, an air outlet and an air flow path extending between the dirty air inlet and the air outlet, wherein the air outlet is in fluid communication with a vacuum source; (b) a brush mounted in the housing directly over the dirty air inlet; and
,(c) a pressure sensor drivingly connected to one of the brush and the housing to move the brush between a first position and a second position wherein the brush is spaced further from the dirty air inlet in the second position than the first position in response to the air pressure in the air flow path downstream of the dirty air inlet. - View Dependent Claims (28, 29, 30)
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31. A vacuum cleaning head for cleaning a surface comprising:
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(a) a casing having a dirty air inlet for receiving an air flow, an air outlet and an air flow path extending between the dirty air inlet and the air outlet, wherein the air outlet is in fluid communication with a vacuum source; (b) a brush movably mounted in the casing between a first position and a second position, the first position being closer to the dirty air inlet than the second position; (c) a pressure sensor drivingly connected to the brush to move the brush with respect to the dirty air inlet in response to the air pressure in the air flow path downstream of the dirty air inlet; and
,(d) a manually adjustable control drivingly connected to the brush whereby a person can manually move the brush with respect to the dirty air inlet.
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Specification