The shakes are provided by old ladies, who have contracted them through a lifetime of the over indulgence in vigorous sexual activity.
The device has a hinge at the front and two handles at the back, into which the shakes are fed.
The shakes are then passed through an pulpatator, transforming it into patential energy.
*20mins later* Behold ! The same patmobile approacheth.
*35mins later* One patmobile has moved on. . . .