VACUUM CLEANER

• US 3,597,789 A
• Filed: 03/13/1970
• Issued: 08/10/1971
• Est. Priority Date: 03/13/1970
• Status: Expired due to Term

• Current Assignee: Black & Decker Incorporated (Stanley Black & Decker, Inc.)
• Original Assignee: N/A
• Time in Patent Office: 515 Days
• US Class Current: 15/383
• CPC Class Codes: A47L 5/30 with driven dust-loosening tools, e.g. rotating brushes
• CPC Class Codes: A47L 9/0477 Rolls

Abstract

An electric vacuum cleaner having a generally cylindrical brush roller positioned in the suction nozzle of the vacuum cleaner wherein the brush roller includes a wall positioned adjacent to and extending outwardly from portions of the brush bristles for causing the bristles to bend over when a carpet is sucked partially into the suction nozzle. This construction reduces the resistance of the bristles on the carpet pile thereby preventing the brush from stalling.

Claims

1. An electric vacuum cleaner having a suction creating means comprising:

a. a suction nozzle connected to said suction creating means;

b. a generally cylindrical brush roller mounted for rotation in said suction nozzle, said roller including a generally flat surface disposed approximately perpendicular to a radius of said roller, the trailing edge of said flat surface intersecting the generally cylindrical outer surface of said brush roller and the leading edge of said generally flat surface terminating in a wall extending substantially perpendicular to said flat surface;

c. a plurality of bristles mounted on the brush roller extending outwardly from the flat surface of said brush roller, said bristles being located relatively close to said generally perpendicular wall;

d. said generally perpendicular wall being generally parallel to said plurality of bristles and extending from said flat surface to the generally cylindrical surface of said brush roller so that when a carpet being cleaned is sucked upwardly partially into said suction nozzle the cylindrical surface of said roller in the vicinity of said perpendicular wall contacts the carpet pile and the generally perpendicular wall prevents the carpet pile from contacting radial Inner portions of the bristles whereby the radial outer portions of the bristles in contact with the carpet are bent toward the trailing edge of the flat surface thereby preventing the brush from stalling due to the resistance of the bristles on the carpet pile.

2. An electric vacuum cleaner brush roller as defined in claim 1 wherein the height of said generally perpendicular wall is approximately one-fourth the length of said bristles.

3. An electric vacuum cleaner brush roller as defined in claim 1 wherein said generally perpendicular wall is positioned approximately three-sixteenth inch from said brush bristles.

4. An electric vacuum cleaner brush roller as defined in claim 1 wherein the distance from the radial inner portions of said brush bristles to the trailing edge of said flat surface is approximately equal to the length of said brush bristles so that when said brush bristles are bent toward the trailing edge of the flat surface they tend to lie partially within the recess formed in said brush roller by said flat surface and said generally perpendicular wall.

5. An electric vacuum cleaner cylindrical brush roller as defined in claim 1 wherein a pair of generally flat surfaces are cut into the generally cylindrical brush roller, said pair of flat surfaces are spirally arranged, and a plurality of tufts of bristles are positioned in radial apertures drilled in the flat surfaces.

6. An electric vacuum cleaner construction as defined in claim 1 wherein the upper portion of said generally perpendicular wall and the generally cylindrical surface of said brush roller are rounded at the intersection of said generally perpendicular wall with the cylindrical surface so that a relatively smooth surface of the brush roller is moved on the carpet being cleaned when the carpet is sucked upwardly into contact with the brush roller.