Simplified Hinge Structure

A simplified hinge structure, comprising:

• a central plate (1);
• a side-plate set including a first side plate (2) and a second side plate (3) whose upper ends are fixed together, lower ends of the first side plate (2) and the second side plate (3) wrapping around opposite upper sides of the central plate (1) to form a rotatable assembly;
• wherein the lower ends of the first side plate (2) and the second side plate (3) are stamped from inside to outside to form a first detent groove (21) and a second detent groove (31), and outer lower ends of the first side plate (2) and the second side plate (3) are drawn to form outwardly projecting first and second protrusions (22, 32) respectively corresponding to the first detent groove (21) and the second detent groove (31);
• inner walls of the first detent groove (21) and the second detent groove (31) are formed with multiple first protruding teeth (20) and second protruding teeth (30) arranged in a stepped pattern;
• and
• a detent pin assembly (4) including a detent pin piece (41) extending through and movable within the central plate (1) and a spring piece (42) abutting the detent pin piece (41) to provide elastic force, opposite sides of the detent pin piece (41) extending beyond two side faces of the central plate (1) and being respectively embedded in the first detent groove (21) and the second detent groove (31) and blocked by the first protrusion (22) and the second protrusion (32), and tooth grooves (411) on the detent pin piece (41), under the elastic force of the spring piece (42), being in close engagement with the first protruding teeth (20) and the second protruding teeth (30).