Abstract: On a panel frame 1 of a closure made of metal or plastic profiles, the grooved surface 4 has a guide channel 5 which is open on one side, but provided on both sides with undercuttings 6 in the crosswise direction for the accommodation of a connecting rod. The connecting rod found in guide channel 5 is coupled by the open side of the latter with a control mechanism, which has a pinion 14 that can be driven by an operating handle and is supported in a housing. In the region of incorporation of the control mechanism, the metal or plastic profile of panel frame 1 is provided with a notch 22, which penetrates the bottom 8 of guide channel 5 and in which is engaged the housing segment 15 of the control mechanism supporting pinion 14. At least one of the ends of a coupling slide bar 17 of longitudinally displaceable guiding housing segment 16 of the control mechanism permanently engaged with pinion 14 is supported in front of the open side of guide channel 5 on the metal or plastic profile.