Patent ID: 8464468

Claim:
A drive unit for a door, comprising: a guiding device that extends in a movement direction of the door and comprises a guide rail and a guide element; a carriage including a drive device disposed inside the carriage, the carriage being movable back and forth along the guide rail and being engaged with the guide element, wherein the drive device is supplied with power via the guide rail and the guide element; and electrical plug connectors arranged to electrically connect the guide element and the guide rail to an external power source; a connecting housing fitted onto the guide rail and comprising first and second electrical spring-loaded contacts that constitute components of the electrical plug connectors; an insert element positioned in the guide rail and including a tensioning fixture arranged to tension the guide element and a power supplying mechanism to supply electrical power to the guide element, wherein the connecting housing is fitted onto the insert element; and a third electrical spring-loaded contact, wherein the second electrical spring-loaded contact is positioned on a wall of the insert element, makes electrical contact with the third electrical spring-loaded contact, and is electrically connected via the power supplying mechanism to the guide element.