Robert Lawrence TWEEDIE,Christopher Graham VINCENT,Geoffrey Michael BURLINGTON
申请号：
US15714174
公开号：
US20180085207A1
申请日:
2017.09.25
申请国别(地区):
US
年份:
2018
代理人:
摘要：
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.
