公开(公告)号：US20180084898A1

公开(公告)日：2018-03-29

申请号：US15714219

申请日：2017-09-25

Applicant: Dyson Technology Limited

Inventor： Christopher Graham VINCENT ,  Robert Lawrence TWEEDIE ,  Jason Godfrey JONES ,  Robert Stefan WRONSKI ,  Philip Stephen DARLING ,  Edward Michael WAUGH

IPC: A46B11/00 ,  A46B15/00

CPC classification number: A46B11/0006 ,  A46B11/0055 ,  A46B11/0062 ,  A46B11/0096 ,  A46B15/0004 ,  A46B15/0044 ,  A46B2200/1066 ,  A61C1/0092 ,  A61C17/0202 ,  A61C17/028 ,  A61C17/16 ,  A61C17/227 ,  A61C17/3427 ,  F04B9/02 ,  F04B19/22 ,  F04B23/02

Abstract: A pump assembly for a dental cleaning appliance includes a fluid chamber, a piston, and a drive. Magnets, connected respectively to the piston and the drive, enable the drive to couple to the piston and move it within the fluid chamber to draw fluid into the fluid chamber. A stop prevents the piston from being pulled beyond a stop position so that through continued actuation of the drive the magnets separate to allow a spring to push the piston away from the stop position to urge a burst of fluid from the fluid chamber.