Patent ID: 8082626

Claim:
A hinge for anchoring and automatic closing to provide swiveling of a display relative to one side of a host body, comprising: a first fastening seat which has an extended installation end fastened to the host body, an axle support portion having an axle hole, and the first fastening seat having an anchor notch; a pintle which has a shaft running through the axle hole and a fastening pin; a second fastening seat which has a pin hole receiving the fastening pin and a coupling end fastened to the display; a torsion rotary member which is fixedly coupled on the pintle and has a protrusion on one surface end and a bulged edge on other surface end; a main torsion anchor member which is axially coupled on the pintle at one side of the torsion rotary member and fixedly fastened to the first fastening seat, and has a retaining latch trough latchable with the protrusion and a steep sloped surface slidable upon the protrusion; an ancillary torsion anchor member which is axially coupled on the pintle at another side of the torsion rotary member and slidable axially to couple with the first fastening seat and the main torsion anchor member, and has a gradual sloped surface slidable upon the bulged edge; a compressed elastic reed assembly which is axially coupled on the pintle and includes a plurality of arched washers to provide a friction force required by swiveling of the torsion rotary member against the main torsion anchor member and the ancillary torsion anchor member; and a nut fastened to a distal end of the shaft of the pintle; wherein the main torsion anchor member and the torsion rotary member are compressed by a returning force of the compressed elastic reed assembly and the protrusion rapidly slides through the steep sloped surface in the retaining latch trough when the pintle pivots to a selected angle so that the display automatically and fully folds over the host body; the torsion rotary member pivoting concurrently so that the bulged edge slides on the gradual sloped surface of different gradients of the ancillary torsion anchor member and is compressed by the returning force of the compressed elastic reed assembly, thereby adequate friction resistance is generated such that the display performs a light opening, heavy closing, and stageless effect during unfolding while the pintle pivots within an angle of ninety degrees.