Concealed Chain Spring Door Closer for Invisible Doors and Wooden Doors
Concealed door closer hinge structure, comprising an upper shaft device and a lower shaft device for connection between the door frame and the door body.
It is characterized in that one side of the door frame has openings near the upper and lower ends. The upper and lower openings are provided with an upper shaft device and a lower shaft device respectively in the door frame. The upper shaft device includes armless door closer, the armless door closer spindle upward, and the spindle is equipped with a hidden hinge to drive its rotation on the outside of the lower shaft device includes a cylindrical base, the upper face of the base near the center of the position is opened downward groove, the groove cross-section is round and the bottom of the groove is hemispherical, the bottom of the groove is laid with a layer of ball layer. The upper side of the ball layer is provided with a hemispherical connector, and the upper end of the hemispherical connector is provided with an upward rotating shaft near the center, and the diameter of the rotating shaft is smaller than the diameter of the hemispherical connector, and the upper end of the rotating shaft extends to the outer side of the groove, and the outer side of the extension is also equipped with a hidden hinge that drives its rotation, and the lower end of the base is provided with a positioning axis for positioning it.
It is characterized in that one side of the door frame has openings near the upper and lower ends. The upper and lower openings are provided with an upper shaft device and a lower shaft device respectively in the door frame. The upper shaft device includes armless door closer, the armless door closer spindle upward, and the spindle is equipped with a hidden hinge to drive its rotation on the outside of the lower shaft device includes a cylindrical base, the upper face of the base near the center of the position is opened downward groove, the groove cross-section is round and the bottom of the groove is hemispherical, the bottom of the groove is laid with a layer of ball layer. The upper side of the ball layer is provided with a hemispherical connector, and the upper end of the hemispherical connector is provided with an upward rotating shaft near the center, and the diameter of the rotating shaft is smaller than the diameter of the hemispherical connector, and the upper end of the rotating shaft extends to the outer side of the groove, and the outer side of the extension is also equipped with a hidden hinge that drives its rotation, and the lower end of the base is provided with a positioning axis for positioning it.
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