Door-closer comprises three self-contained stages arranged so that open-hold-close functions are performable through interaction of elements of these stages

摘要

The door-closer comprises three self-contained stages in the form of a planetary gear (4), an electric motor (2, 3) and an electromechanical brake (8, 9, 15) arranged so that open-hold-close functions are performable through interaction of elements of these stages.