| 摘要 |
A cleaner head 1 comprising a housing 2, an agitator 3 and a drive assembly 4 for driving agitator 3. Drive assembly 4 comprises a dog 12 for transmitting torque to the agitator 3. One of the dog 12 and the agitator 3 comprises a tapered head 13, a shank 14 that extends from head 13, and a screw thread 15 formed around shank 14. The other of the dog 12 and the agitator 3 comprises a bore (19, Fig 5) having a complementary screw thread (21). The screw thread has a maximum lead angle (see fig 3) of 60 degrees and each screw thread 15 (21) has a plurality of starts (22) and turns through a maximum angle of 360 degrees and a minimum angle of 120 degrees. Agitator 3 may be removed from cleaner head 1 and each screw thread has a buttress thread form. Shank 14 projects in to bore (19) and threads 15, (21) mate so that as dog 12 rotates, agitator 3 screws on and tightens against dog 12. Other elements include electric motor 10, transmission 11, bushing 7 and removable cap 8. |
