VORRICHTUNG FUER EINE STUFENWEISE BEWEGUNG

摘要

An apparatus for providing stepwise movement along an elongated stepped member. A holder contains at least one button that includes a pivotally mounted claw disposed to engage the stepped member when the button is depressed. The claw pivots upon engagement with the stepped member and further depression of the button moves the button and holder laterally a distance determined by the steps on the stepped member.