K groove, innovated by HOPO company, is a new profile structure for casement window, that has been widespread in many countries. The main feature of K groove system is to enlarge the dimension of the frame groove. In this case, frame groove of casement window needs no processing for mounting heavy friction hinges. The anti-wind-load capacity of locking systems and the max. load capability for the hinges will be greatly enhanced if the K groove structures are applied to profiles for inward opening windows and swinging doors. The invention of K groove is targeting on quality and security improvement for the whole window and door systems, as well as improving efficiency and effectiveness for fabrication.
The key fittings for door with K groove profiles are hinges and locking plates that are stronger than normal fittings, because the fixing part on the frame side are enlarged according the sides of the K groove.
The window can be cleaned in turning position. Ventilation can be achieved in tilt position. Concealed hinges improved the visual appearance of the window. Concealed hinges improved integrity of the sealing system, achieving a better sealing effect. Suitable for K groove profile.
Designed for K groove profile, enhancing a fixing effect of frame parts. Can be opened in both top-hung and side-hung positions. Special designed supporting structure ensures impossible for sinking deformation. Stainless steel sash hinge part increased the reliability of the whole window system.