Abstract: An electric toothbrush has an eccentric unbalanced drive shaft extension constrained by a brush head to rotate freely about a longitudinal axis inside a cavity in the brush head. The shaft extension and the brush head are flexibly coupled to a drive shaft and a remote end of a shank, respectively. When the shaft is rotated by an electric motor in a handle of the toothbrush, the brush head is caused to vibrate. The handle is not caused to vibration to any significant extent.

Abstract: An electric toothbrush has a balanced mass provided on a shaft extension that rotates freely about a longitudinal axis, inside a cavity in a brush head The shaft extension and the brush head are flexibly coupled to a drive shaft and to a remote end of a shank respectively. When the shaft is rotated by an electric motor in a handle, of the toothbrush, an off-set stub axle, effectively at a remote end of the shaft extension and fitted to a bearing in the brush head, causes the brush head to vibrate. The shank is not caused to vibrate to any extent.

Abstract: A heatable hair crimper has a hollow handle and a comb formed of metallic prongs in rows and columns. Alternate rows are mounted to a metal base plate heated by a pad. When a plunger is squeezed the plate is moved so that hair extending across the comb in the columns is formed and held in tortuous paths while heat is applied via the prongs. Jointed levers are disposed within the hollow handle and are straightened by squeezing action on the plunger.