Vacuum Cleaner with Screen Cage

• US 20130276262A1
• Filed: 04/24/2012
• Published: 10/24/2013
• Est. Priority Date: 04/24/2012
• Status: Active Grant

• Current Assignee: Great Star Tools USA, Inc.
• Original Assignee: Shop-Vac Corporation (Hangzhou Great Star Industrial Company Limited)
• Inventors: Wolfe, Melvin E., Buss, Randy L., Liu, Li H.
• Granted Patent: US 9,198,552 B2
• Time in Patent Office: Days
• US Class Current: 15/347
• CPC Class Codes: A47L 7/0071 with containers for ash, soot, contaminant or harmful materials suction devices for removing ashes F23J1/02

Abstract

A vacuum cleaner has a screen cage that is permanently attached to a lid that fits on a receptacle. The screen cage has multiple layers of screens with different screen sizes, including an inner support that has greater rigidity and larger apertures that the primary screen, and an outer screen that also has greater rigidity and larger apertures than the primary screen, and is made of a different material than the support. A replaceable filter mounts to a power head that can be removed from the lid while the lid remains attached to the receptacle, and nests in the screen cage. A thermal cutoff shuts the vacuum cleaner off when the temperature of air in a part of the flowpath exceeds a limit.

Claims

1. A vacuum cleaner that has:

a receptacle;

a lid that fits on the receptacle;

a screen cage that is attached to the lid and extends into the receptacle;

a power head that is attached to and can be removed from the lid by a consumer while the lid remains attached to the receptacle;

a replaceable filter that mounts to the power head and can be removed and replaced by a consumer while the lid and the attached screen cage remain attached to the receptacle; and

a vacuum source that develops an airflow that leads into the interior of the receptacle, through the screen cage, to the replaceable filter.

2. A vacuum cleaner as recited in claim 1, in which the replaceable filter nests in the screen cage when the power head is attached to the lid.

3. A vacuum cleaner as recited in claim 1, in which the screen cage is permanently attached to the lid.

4. A vacuum cleaner as recited in claim 1, in which the screen cage has multiple layers of screens with different screen sizes.

5. A vacuum cleaner as recited in claim 1, in which:

the replaceable filter nests in the screen cage when the power head is attached to the lid;

the screen cage has multiple layers of screens with different screen sizes; and

the vacuum cleaner has a thermal cutoff that shuts the vacuum cleaner off when the temperature of air in a part of the flowpath exceeds a limit.

6. A vacuum cleaner as recited in claim 1, in which:

the screen cage has a screen that has apertures in the range of 0.05-0.3 mm; and

the screen cage has a support that is positioned on a face of the screen, has greater rigidity than the screen, and has apertures in the range of 0.3-2.0 mm.

7. A vacuum cleaner as recited in claim 1, in which:

the screen cage has a primary screen;

the screen cage has an outer screen that is positioned on an outer face of the primary screen, has greater rigidity than the primary screen, and has apertures larger than those of the primary screen; and

the screen cage has an inner support that is positioned on an inner face of the primary screen, has greater rigidity than the primary screen, has apertures larger than those of the primary screen, and is made of a different material than the outer screen.

8. A vacuum cleaner as recited in claim 1, in which:

the replaceable filter nests in the screen cage when the power head is attached to the lid;

the screen cage has a primary screen;

the screen cage has a support that is positioned on a face of the screen and has greater rigidity than the screen; and

the screen cage has an outer screen that is positioned on an outer face of the primary screen, has greater rigidity than the primary screen, has apertures larger than those of the primary screen, and is made of a different material than the support.

9. A vacuum cleaner that has:

a screen that has apertures in the range of 0.05-0.3 mm;

a support that is positioned on a face of the screen, has greater rigidity than the screen, and has apertures in the range of 0.3-2.0 mm; and

a vacuum source that develops an airflow path that leads into the interior of a receptacle, through the screen and the support, to a separate filter.

10. A vacuum cleaner as recited in claim 9, in which:

the vacuum cleaner also has an outer screen that has greater rigidity than the screen, has apertures larger than those of the screen, and is made of a different material than the support.

11. A vacuum cleaner that has:

a primary screen;

an outer screen that is positioned on an outer face of the primary screen, has greater rigidity than the primary screen, and has apertures larger than those of the primary screen;

an inner support that is positioned on an inner face of the primary screen, has greater rigidity than the primary screen, has apertures larger than those of the primary screen, and is made of a different material than the outer screen; and

a vacuum source that develops an airflow path that leads into the interior of a receptacle, through the outer screen, the primary screen, and the inner support, to a separate filter.

12. A vacuum cleaner as recited in claim 11, in which:

the primary screen has apertures in the range of 0.05-0.3 mm; and

the inner support has apertures in the range of 0.3-2.0 mm.