Crankshaft actuator and oral healthcare device and method of providing crankshaft actuation for oral healthcare device

摘要

A semi-free rotating crank actuator (80) for an oral health care device includes a chamber (82), a spring loadable plunger (85), and a crank mechanism (88). The crank mechanism (88) includes at least a drive pin (90) that is driven to rotate about a drive shaft (96), and a crankshaft (94) that is semi-freely rotatable about the drive shaft. The shaft (94) is coupled to a spring loadable plunger (85) and (i) a drive pin (90) in a first mode of operation, (ii) a spring loadable in a second mode of operation. A plunger (84) from an undesired end position to a desired end position in response to the plunger (85) and (iii) the crankshaft (94) pushing the plunger (84) from an undesired end position to a desired end position Partially driven around the drive shaft (96) via the drive pin (90) in a third mode of operation, including at least completing incomplete operation of the drive.