Vacuum cleaner with suction indicator
First Claim
1. A vacuum cleaner having a suction nozzle inlet for cooperation with a surface to be cleaned, comprising in combination:
- means for variably adjusting the height of the nozzle relative to a surface to be cleaned;
means to sense a differential air pressure between that of the atmosphere and that within the nozzle of the operating vacuum cleaner;
an electrical switch actuated in response to said differential pressure sensing means sensing a predetermined level of differential pressure;
a voltage source including terminals on the nozzle; and
indicator means connected electrically to said voltage source terminals through said switch whereby said indicator indicates to the operator that the height adjustment of the nozzle is proper due to the magnitude of the differential pressure a suction for most effective cleaning.
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Accused Products
Abstract
A vacuum cleaner has an adjustable-height suction nozzle. A diaphragm switch is mounted in the housing inside the nozzle and determines a differential air pressure of the operating vacuum cleaner. Voltage source terminals are self-energizing with the rotation of a rotatable brush inside the nozzle and an indicator lamp is illuminated, or extinguished, upon developing a proper suction as establised by the proper adjusted height of the nozzle relative to the floor surface. The foregoing abstract is merely a resume of one general application, is not a complete discussion of all principles of operation or applications, and is not to be construed as a limitation on the scope of the claimed subject matter.
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Citations
21 Claims
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1. A vacuum cleaner having a suction nozzle inlet for cooperation with a surface to be cleaned, comprising in combination:
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means for variably adjusting the height of the nozzle relative to a surface to be cleaned; means to sense a differential air pressure between that of the atmosphere and that within the nozzle of the operating vacuum cleaner; an electrical switch actuated in response to said differential pressure sensing means sensing a predetermined level of differential pressure; a voltage source including terminals on the nozzle; and indicator means connected electrically to said voltage source terminals through said switch whereby said indicator indicates to the operator that the height adjustment of the nozzle is proper due to the magnitude of the differential pressure a suction for most effective cleaning. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A vacuum cleaner comprising, in combination:
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a nozzle connected to said vacuum cleaner for cooperation with a surface to be cleaned; a rotatable brush in said nozzle; means to adjust the height of the nozzle relative to a surface to be cleaned; a permanent magnet on said rotatable brush; a pickup coil mounted in a stationary manner on said nozzle for cooperation with said rotatable permanent magnet to generate an alternating voltage; a diaphragm switch having a diaphragm and first and second electrical contacts; means connecting one side of said diaphragm to atmosphere; means connecting the other side of said diaphragm to the air flow circuit within said vacuum cleaner; a voltage energized indicator; means connecting said pickup coil to said indicator through said diaphragm switch to energize said indicator, whereby said indicator indicates to the operator that the height adjustment of the nozzle is proper due to a predetermined difference existing between atmospheric pressure and pressure within the air flow circuit with a suction for most effective cleaning. - View Dependent Claims (8, 9, 10, 11, 12, 13)
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14. A vacuum cleaner operating condition indicator with the vacuum cleaner having a rotatable brush in a height-adjustable nozzle, comprising, in combination;
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a unitary housing; first and second indicator lights mounted in said housing; a diaphragm switch having a diaphragm and mounted in said housing; means mounting said housing in height-adjustable nozzle with said indicator lights externally visible; means to apply the differential air pressure of the nozzle of the vacuum cleaner to opposite sides of said diaphragm; a pickup coil mounted in said housing and having a pole piece adapted for cooperation with a magnet rotatable with the brush of the vacuum cleaner; means connecting said pickup coil directly to said first indicator light to be illuminated in response to brush rotational speed; and means connecting said pickup coil in series with said diaphragm switch and said second indicator light to change the indicator condition thereof upon proper spacing, with a suction for most effective cleaning, of the vacuum cleaner nozzle to a surface to be cleaned to establish the differential air pressure to actuate said switch. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21)
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Specification