WINDOW OPERATOR WITH DIAL INTERFACE

摘要

An operator for controlling pivoting of a window sash relative to a window frame including dual arms which pivot relative to one another to move the window sash. A drive input pivotally drives a drive member which is eccentric about its pivot axis, where the drive input includes recesses spaced from the input pivot axis and engageable by a user's fingers to manual pivot the drive input. A drive ring gear is pivotable relative to thedrive member and includes two axially spaced sets of gear teeth. The dual arms are secured to separate ring gears which are respectively associated with the two gear teeth sets. The drive ring gear is moved eccentrically relative to the pivot axis by the eccentric drive member whereby at least some of the teeth of the first set of drive ring gear teeth are disengaged from the teeth of its associated arm ring gear and at least some of the teeth of the second set of drive ring gear teeth are disengaged from the teeth of its associated arm ring gear. At least one of the first and second arm ring gears or the first and second sets of drive ring gear teeth have different numbers of teeth.