Device for opening and closing a moveable part with a seal having a hollow section

Method for operating a device for opening and closing of a motorized, moveable part (10), comprising the following steps:

• providing said moveable part (10) with a seal arranged along a frame (14) of the part (10);
• providing a control unit (30);
• providing a clamping protection device, wherein upon closing of the part (10), said clamping protection device detects an obstacle (25) disposed in a movement path of the part (10) and relays a signal to the control unit (30) in order to stop or reverse movement of the part (10);
• wherein the seal (28) has at least one closed hollow section (16) with a defined cross-section (18), wherein said at least one hollow section (16) is filled with a medium (34) in the form of a liquid or gas;
• providing a measuring device (30), wherein said measuring device (30) measures the temporal change of at least one measured parameter of the medium, and wherein a predetermined change per unit time of the at least one measured parameter is determined as a threshold value for the initiation of a clamping protection function, wherein said predetermined changed corresponds to a maximal increase of a clamping force (36).