FIELD: construction.
SUBSTANCE: this invention relates to a window system. The window system comprises fittings, which have the shape of a polygonal frame and sending a force via an intermediate link in accordance with the handle rotation, and a lower roller block installed on the lower horizontal section of fittings and comprising the following: a support plate that perceives the specified force from fittings; a guide plate connected with the support plate by means of a guide pin; a roller body, in which the roller is arranged; and a roller lever that connects the roller body and the guide plate. At the first angle of handle rotation the guide pin is arranged in the centre of the guide slot made in the guide plate, for provision of dense contact of the roller body and the support plate, and at the second angle of handle rotation the pin is arranged in the far end of the guide slot for provision of engagement between the hook made on the window frame with the ledge made on the lower horizontal section of the fittings.
EFFECT: improved design.
5 cl, 5 dwg
