Patent ID: 7513078

Claim:
An electrical floor-hinge device for automatically swinging a door open and close, comprising: a hollow body member formed by a cover element and a basin element, said cover element having a top; a platform element arranged at an end of said top of said cover element, said platform element having lateral sides provided with a plurality of grooves; a plurality of washers engaged with said grooves; an electrical motor; a speed reducing element having an input shaft for delivering torque generated from said electrical motor, said input shaft being connected to said speed reducing element and penetrating vertically through said cover element into said basin element, said input shaft having a first bevel gear which is engaged with a second bevel gear mounted at a first end of said involute shaft, a second end of said involute shaft penetrating through a chamber beneath said cover element via two cone bearings at an entrance and an exit to said chamber thereby holding said involute shaft laterally beneath said cover element, a threaded segment of said involute shaft being housed inside said chamber, each of said cone bearings being fixedly attached to said chamber by a ring element and a stopping plate, said threaded segment of said involute shaft being joined to a driven gear at a middle section of a vertical output shaft, a top end of said output shaft penetrating upward through said cover element and configured with a ring having an extended deflecting bar, a cone bearing and a ring element, a bottom end of said output shaft being configured with a cone bearing, a cone bearing being provided along said output shaft between said driven gear and said ring; said basin element having a cylindrical seat for supporting and accommodating said cone bearing at said bottom end of said output shaft; a seat element fitted on a cone bearing at a top end of said output shaft; and an elongated rod having two ends fixedly locked to said deflecting bar with a first screw and to said block with a second screw.