US 12,446,743 B2
Cleaner head for a vacuum cleaning appliance
Stefan Koch, Dorset (GB); and Andrew James Bower, Bristol (GB)
Assigned to Dyson Technology Limited, Malmesbury (GB)
Appl. No. 17/767,366
Filed by Dyson Technology Limited, Wiltshire (GB)
PCT Filed Sep. 22, 2020, PCT No. PCT/GB2020/052286
§ 371(c)(1), (2) Date Apr. 7, 2022,
PCT Pub. No. WO2021/069861, PCT Pub. Date Apr. 15, 2021.
Claims priority of application No. 1914653 (GB), filed on Oct. 10, 2019.
Prior Publication US 2022/0395153 A1, Dec. 15, 2022
Int. Cl. A47L 9/04 (2006.01); A46B 13/00 (2006.01); A46B 13/02 (2006.01); A46D 1/00 (2006.01)
CPC A47L 9/0477 (2013.01) [A46B 13/006 (2013.01); A46B 13/02 (2013.01); A46D 1/0207 (2013.01); A46B 2200/3033 (2013.01)] 12 Claims
OG exemplary drawing
 
1. A cleaner head for a vacuum cleaning appliance, the cleaner head comprising:
a main body supporting an agitator, the agitator comprising a rotatable cylindrical body that bears an elongate agitator formation for engaging a surface as the cylindrical body rotates,
wherein the elongate agitator formation includes:
a first agitator row that extends around the cylindrical body in a direction from a respective first edge (L) of the cylindrical body towards a respective second edge (R) in a first helical direction, the first agitator row extending from a position proximate the first edge (L) towards or beyond a centre (C) of the cylindrical body, and a second agitator row that extends around the cylindrical body in a direction from the second edge (R) of the cylindrical body towards the first edge (L) in a second helical direction that is counter to the first helical direction, the second agitator row extending from a position proximate the second edge (R) towards or beyond the centre (C) of the cylindrical body, the first and second agitator rows extending axially along the cylindrical body such that they do not overlap with one another, wherein an axially inner end of the first agitator row and an axially inner end of the second agitator row are angularly offset from one another, and wherein the first agitator row comprises agitators of a first material and wherein the second agitator row comprises agitators of a second material that is different to the first material,
wherein the elongate agitator formation is configured such that during use, at every degree of rotation of the cylindrical body, the elongate agitator formation maintains only two points of contact with the floor surface, one point of contact being between the first edge (L) and the centre (C) of the cylindrical body and one point of contact being between the second edge (R) and the centre (C) of the cylindrical body, the distance between the centre (C) of the cylindrical body and the point of contact between the first edge (L) and the centre (C) of the cylindrical body always being different from the distance between the centre (C) of the cylindrical body and the point of contact between the second edge (R) and the centre (C) of the cylindrical body.