Joinery for use in building, has outer and inner window frames whose sides have receiving chamber for receiving corresponding sides of door leaves to protect door leaves from thermal variations between exterior and interior of frame

摘要

The joinery has outer and inner window frames (2, 3) arranged in receiving and guiding frames by moving respective outer and inner door leaves (4, 5). The window frames are connected with each other through a joining unit (10). Sides of the window frames have a receiving chamber (8) for receiving corresponding sides of the door leaves to protect the door leaves from thermal variations between exterior and interior of a frame (1).