In my home is a common household object. I securely attached a marking pen to some point on the household object, and I placed a sheet of graph paper next to the pen, so the paper would not move. I then operated the household object in the normal manner, and it drew the pattern below. What is the household object?
Notes: My marker did not draw smoothly, but under perfect conditions, the curve would be smooth (not wavering), point A would be vertical at the end, and point B would be horizontal at the end.