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1. (WO2018055329) CLEANING APPLIANCE

Pub. No.:    WO/2018/055329    International Application No.:    PCT/GB2017/052518
Publication Date: Fri Mar 30 01:59:59 CEST 2018 International Filing Date: Wed Aug 30 01:59:59 CEST 2017
IPC: A61C 17/02
A61C 17/028
A61C 17/16
A61C 17/22
A61C 17/34
Applicants: DYSON TECHNOLOGY LIMITED
Inventors: TWEEDIE, Robert
VINCENT, Christopher
BURLINGTON, Geoffrey
Title: CLEANING APPLIANCE
Abstract:
A pump assembly for a dental cleaning appliance includes a fluid chamber, a piston, and a drive. The drive rotates a coupling member having two angularly opposed pins. An arm pivotably connected to the piston has a seat for receiving one of the pins to couple the piston to the drive. Through continued rotation of the coupling member, the piston moves within the fluid chamber to draw fluid into the fluid chamber until the second detent contacts the arm to push it away from the first detent to decouple the drive from the piston. This allows a compressed spring to actuate the piston to urge a burst of fluid from the fluid chamber.