TORSION BAR DEVICE FOR AUTOMATICALLY CLOSING DOOR

PURPOSE:To keep an initial torque on closing a door and reduce the whole length, while decreasing the weight on opening it. CONSTITUTION:One side of the vertical direction of a door is supported to the frame to be freely rotatable by an upper hinge device and a lower hinge device. The hexagonal nut 20 at the lower end of a first torsion bar 18 of a torsion bar device 3 is fixed not to be rotated at a rotary member 38. A connection piece 22 is fixed not to be rotated at the upper end of the first torsion bar 18 to loosely fit in the sash 11. The upper end of the second torsion bar 19 of the torsion bar device 3 is fitted not to be rotated to the connection piece 22 and to be transferable in the longitudinal direction. And the lower end extended to the lower end side of time first torsion bar 18 is fixed to the fitting piece 21 attached to the sash 11.