Patent ID: 7979962

Claim:
A hinge mechanism comprising: a first supporting frame including first and second sides opposite to each other, a first stopping member disposed on one of the first and second sides, a plurality of first positioning sections disposed on the other of the first and second sides, and a first hole extending through the first and second sides; a first hinge device including a first pintle rotatably installed on the first supporting frame, with the first pintle including a first end and a second end extending through the first hole, a first positioning member installed on the first pintle and rotatable with the first pintle, with the rotation of first positioning member limited between proximal and distal ends of the first stopping member, a second positioning member installed on the first pintle and rotatable with the first pintle, with the second positioning member including a first engaging portion engagable with one of the plurality of first positioning sections for positioning the first pintle at various orientations, and a plurality of first resilient members installed coaxially on the first pintle, with the plurality of first resilient members biasing the first engaging portion of the second positioning member to engage with one of the plurality of first positioning sections; a second supporting frame including a second hole engaged with the second end of the first pintle and including first and second lateral sides parallel to each other, with the first lateral side including first and second walls opposite to each other, a second stopping member disposed on one of the first and second walls, a plurality of second positioning sections disposed on the other of the first and second walls, and a third hole extending through the first and second walls; and a second hinge device including a second pintle rotatably installed on the first lateral side of the second supporting frame, with the second pintle including a first end and a second end extending through the third hole, a third positioning member installed on the second pintle and rotatable with the second pintle, with the rotation of the third positioning member limited between proximal and distal ends of the second stopping member, a fourth positioning member installed on the second pintle and rotatable with the second pintle, with the fourth positioning member including a second engaging portion engagable with one of the plurality of second positioning sections for positioning the second pintle at various orientations, and a plurality of second resilient members installed coaxially on the second pintle, with the second resilient members biasing the second engaging portion of the fourth positioning member to engage with one of the plurality of second positioning sections.