Vacuum cleaning tool with electrically driven brush roller

• US 5,551,119 A
• Filed: 12/17/1993
• Issued: 09/03/1996
• Est. Priority Date: 12/19/1992
• Status: Expired due to Fees

• Current Assignee: Firma Fedag
• Original Assignee: Firma Fedag
• Inventors: Worwag, Peter
• Primary Examiner(s): MOORE, CHRISTOPHER K
• Application Number:
  US08/169,376
• Time in Patent Office: 991 Days
• Field of Search: 15/319, 15/339
• US Class Current: 15/319
• CPC Class Codes: A47L 9/0411 driven by electric motor
• CPC Class Codes: A47L 9/2805 Parameters or conditions being sensed
• CPC Class Codes: A47L 9/2831 Motor parameters, e.g. motor load or speed
• CPC Class Codes: A47L 9/2842 Suction motors or blowers
• CPC Class Codes: A47L 9/2847 Surface treating elements
• CPC Class Codes: A47L 9/2889 Safety or protection devices or systems, e.g. for prevention of motor over-heating or for protection of the user
• CPC Class Codes: Y02B 40/00 Technologies aiming at improving the efficiency of home appliances, e.g. induction cooking or efficient technologies for refrigerators, freezers or dish washers

Abstract

A vacuum cleaning tool for connecting to a suction tube of a vacuum cleaning device according has a casing with a bottom plate facing a floor surface to be cleaned. A brush chamber is enclosed within the casing. A brush roller having bristles is rotatably supported within the brush chamber. An electric motor drives the brush roller. The bottom plate has a suction opening through which the bristles of the brush roller extend. A speed regulator is connected to the electric motor. A movement sensor for controlling the speed regulator is provided, wherein the electric motor is switched off by the speed regulator as a function of a signal emitted by the movement sensor. A first recognition circuit is connected between the movement sensor and the speed regulator.

Claims

1. A vacuum cleaning tool for connecting to a suction tube of a vacuum cleaning device, said tool comprising:

a casing with a bottom plate facing a floor surface to be cleaned;

a brush chamber enclosed within said casing;

a brush roller having bristles and being rotatably supported within said brush chamber;

an electric motor for rotatably driving said brush roller;

said bottom plate having a suction opening;

said bristles of said brush roller extending through said suction opening;

a speed regulator connected to said electric motor;

a movement sensor for sensing movement of said vacuum cleaning tool across a floor;

a first recognition circuit connected between said movement sensor and said speed regulator for recognizing signals emitted by said movement sensor derived from movement of said vacuum cleaning tool across the floor and sending switching signals derived from the signals emitted by said movement sensor to said speed regulator; and

wherein said speed regulator switches on and off said electric motor based on said switching signals.

2. A tool according to claim 1, further comprising a position sensor for sensing whether said vacuum cleaning tool is positioned on the floor and a second recognition circuit, said position sensor connected via said second recognition circuit to said speed regulator, wherein said second recognition sensor, when recognizing a lifting of said vacuum cleaning tool off the floor, actuates said speed regulator for switching off said motor.

3. A tool according to claim 2, wherein said movement sensor and said position sensor are electromechanical sensors.

4. A tool according to claim 3, wherein each one of said electromechanical sensors is comprised of at least one electric contact switched by a movable inertia body.

5. A tool according to claim 4, wherein each one of said electromechanical sensors has a first guide path with two end sections for said inertia body and wherein said at least one electric contact is arranged at one said end section of said first guide path.

6. A tool according to claim 2, further comprising:

a third recognition circuit;

a load sensor; and

wherein said speed regulator is connected via said third recognition circuit to said load sensor.

7. A tool according to claim 6, wherein said load sensor is connected within a circuit of said electric motor.

8. A tool according to claim 7, wherein said load sensor is a resistor.

9. A tool according to claim 2, further comprising a load sensor, wherein said load sensor and said position sensor are both connected to said second recognition circuit.