Patent ID: 7234204

Claim:
A pivotal hinge mechanism for a mobile computer comprising a swivel seat, a support seat, a first pivot mounting part, a second pivot mounting part and a positioning plate, and the swivel seat is supported to rotate on the support seat and relative to the support seat through an angle of 0 to 180 degrees; wherein: the swivel seat has a main body having a bottom side that forms a neck shaft with a reduced inner hole, a top side that forms a connecting shaft extended from the top side in left and right directions, and a circumferential edge on said bottom side that forms a first stopper shoulder arranged in curved shape about the center line of said neck shaft and angularly extending through a range of θ 1 degrees; the support seat has a plate shaped main body that has a cylindrical hollow shaft forming a pivot joint with the neck shaft of said swivel seat; said cylindrical hollow shaft forms an eye-shaped recession on the bottom side for forming a circular shoulder inside, and forms a second stopper shoulder formed on the upper end of said cylindrical hollow shaft along the circumferential edge angularly extending through a range of θ 2 degrees about the center line of said cylindrical hollow shaft, and arranged to satisfy the condition whereby the sum of θ 1 +θ 2 is equal to 180 degrees; the first pivot mounting part and the second pivot mounting part respectively have a pivot mounting hole through which said first pivot mounting part and said second pivot mounting part are mounted on separate connecting shafts of said swivel seat to form pivot connection; and the positioning plate is fastened on the end of the neck shaft of said swivel seat, and installed inside the eye-shaped recession of the cylindrical hollow shaft of said support seat.