Hinge and collapsible device utilizing the same

A collapsible device comprising:

• a base;
• a hinge comprising:
• a first connecting member;
• a shaft unrotatably fixed to the first connecting member, and comprising a fixing end opposite to the first connecting member;
• a second connecting member rotatably mounted to the shaft, and comprising a positioning post, opposite sides of the positioning post each comprising a slant resisting surface;
• a positioning member unrotatably mounted to the fixing end of the shaft, and comprising a positioning protrusion resisting against the positioning post, each opposite end of the positioning protrusion each forming a withstanding surface corresponding to the resisting surface;
• at least one elastic ring rotatably mounted to the shaft and abutting against the positioning member;
• and
• a fastener adjustably fixed to a distal end of the fixing end of the shaft to prevent the second connecting member, the positioning member, and the at least one elastic ring from disengaging from the shaft;
• and
• a cover pivotally mounted to the base via the hinge;
• wherein the first connecting member is fixed to one of the base and the cover, and the second connecting member is fixed to the other one of the base and the cover;
• during rotation of the cover relative to the base to a predetermined degree, one of the resisting surfaces resists against the corresponding withstanding surface for driving the positioning member to move away from the second connecting member to deform the at least one elastic ring.