Height adjustment device

The object to provide a user-friendly handling for the adjustment of the height of components, in particular head rests is solved by the device for height adjustment of a component of a seat in accordance with the invention which consists of a carrier element carrying the component, a locking element designed and arranged to prohibit height adjustability in a first position and to permit height adjustability in a second position, wherein the locking element is connected with an adjusting element via a motion link, and the adjusting element is pulled upward by pulling means so as to transfer the locking element from the first position to the second position.