| 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 countersink (20) and a complementary screw thread (21) formed around a wall of the bore (19). Shank 14 projects into bore (19) and the two threads 15 (21) mate such that, as dog 12 rotates, the agitator screws on to the dog and the tapered head 13 mates with the countersink (20). 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. Other elements include electric motor 10, transmission 11, bushing 7 and removable cap 8. |
