Corner joint for profile sections

A corner joint for profile sections provided with nut means and one or more longitudinal channels in connection with the outside of the profile section via a longitudinal slot opening, the longitudinal slot opening extending in substantially the same direction as the longitudinal channels, the channels constituting an attachment to the nut means which cooperates via screw means with connector fittings, wherein each screw means is provided with a lock means which is located in the slot opening between the nut means and the connector fittings, which the lock means is provided with a screw opening and means for locking the nut means against rotation out of a locking position characterized in:

• that the lock means is provided with at least a first planar surface, in the form of a countersink for receiving and fixation of a portion of the nut means in a first, locked position, in which the nut means is located substantially across from the slot opening;
• that the lock means, at a different level, is provided with a second planar surface, being substantially parallel to the first planar surface, for receiving the nut means in a second, unlocked position, in which the nut means is located substantially parallel with the slot opening, and;
• that the second surface of the lock means is provided with at least one boss, which cooperates with a shoulder on the nut means to stop the nut means during rotation from the first, locked position to the second, unlocked position, the angle of rotation being less than 90°.