Vacuum cleaning tool

• US 5,249,333 A
• Filed: 02/19/1992
• Issued: 10/05/1993
• Est. Priority Date: 02/21/1991
• Status: Expired due to Term

• Current Assignee: Firma Fedag
• Original Assignee: Firma Fedag
• Inventors: Worwag, Peter
• Primary Examiner(s): MOORE, CHRISTOPHER K
• Application Number:
  US07/839,325
• Time in Patent Office: 594 Days
• Field of Search: 15/387
• US Class Current: 15/387
• CPC Class Codes: A47L 9/0416 driven by fluid pressure, e.g. by means of an air turbine

Abstract

A vacuum cleaning tool for a vacuum cleaner, including an intake opening and a brush roller that is disposed in the intake opening and is rotatably driven by an air turbine that in turn is driven by an intake air flow. To obtain a high torque at the brush roller even when the intake air stream fluctuates, the air turbine is embodied as a flow-through turbine having at least one ring-like blade arrangement, between the blades of which are formed axially delimited flow paths for radially receiving the intake air flow and guiding same into the center of the blade arrangement, and for radially discharging the intake air flow out of this inner space.

Claims

1. In a vacuum cleaning tool for a vacuum cleaner, including a housing having an intake opening, outlet means, and a turbine chamber, with a brush roller being disposed in said intake opening and being rotatably driven by an air turbine that is disposed in said turbine chamber and is itself rotatably driven by an intake air flow received from a feed channel that communicates with said intake opening, the improvement wherein:

said air turbine has at least one ring-like blade arrangement that has an open central inner space that is free of blades, whereby between blades of said at least one blade arrangement axially delimited flow paths are formed; and

said feed channel has a mouth portion for directing said intake air flow onto said at least one blade arrangement essentially radially relative to an axis of rotation of said air turbine, whereby said flow paths between said blades radially guide said intake air flow into said open central inner space and radially discharge said intake air flow out of said open central inner space to said outlet means of said housing.

2. A vacuum cleaning tool according to claim 1, in which said air turbine includes a central wheel disk, with each of two axial side surfaces of said wheel disk supporting a respective one of said blade arrangements.

3. A vacuum cleaning tool according to claim 2, in which a free axial side of each of said blade arrangements is provided with a cover ring.

4. A vacuum cleaning tool according to claim 1, in which said center space is axially closed off by a cover disk.

5. A vacuum cleaning tool according to claim 1, in which said axis of rotation of said air turbine extends parallel to an axis of rotation of said brush roller.

6. In a vacuum cleaning tool for a vacuum cleaner, including an intake opening and a brush roller that is disposed in said intake opening and is rotatably driven by an air turbine that in turn is driven by an intake air flow, the improvement wherein;

said air turbine is a flow-through turbine formed by a central wheel disk having tow oppositely facing axial side surfaces, each of which supports a ring-like blade arrangement that has an open central inner space that is free of blades, whereby between the blades of each of said blade arrangements axially delimited flow paths are formed for radially receiving said intake air flow and guiding same into said open central inner space of said blade arrangement, with said flow paths also serving for radially discharging said intake air flow back out of said inner space.

7. A vacuum cleaning tool according to claim 6, which includes a feed channel for said intake air flow, with said feed channel having a mouth portion for directing said intake air flow onto said blade arrangement approximately radially relative to an axis of rotation of turbine wheel of said air turbine.