Dämpfen und Verfahren zur Betätigung einer Tür

摘要

A door closer comprises a housing (10) containing a cylinder (16) and two movable pistons (37, 43). When the associated door is opened, both of the pistons and the cylinder are moved relative to the housing to draw oil into the cylinder. Expulsion of oil from the cylinder through an orifice on closing of the door controls the closing movement.