Patent ID: 8888203

Claim:
A door closure structure for a rotary door rotatably mounted on a main body, wherein the door closure structure comprises: a slide passage, formed in an upper end surface of the rotary door; a hinge assembly, in which the rotary door is mounted on the main body by the hinge assembly and the hinge assembly comprises: a hinge body, fixed on the main body, the hinge body including an inclined plate coupled to a front end of the hinge body; a hinge plate, provided with a hinge hole, and connected to a rear end of the hinge body; and a hinge shaft fitted with the hinge hole; and a swing plate, in which a first end of the swing plate is pivotably connected to the hinge body, and an angle between the swing plate and the upper end surface of the rotary door ranges from 0 to 90°; a spring having two ends connected to the swing plate and the hinge body respectively; and a roller rotatably disposed at a second end of the swing plate to catch into or roll out of the slide passage following a movement of the swing plate; wherein the inclined plate is inclined upwardly from a first end thereof to a second end thereof, wherein the first end of the inclined plate is coupled to the front end of the hinge body and the swing plate is coupled to the second end of the inclined plate; wherein in a closed state of the rotary door, the spring is configured to bias the roller against a surface of the slide passage to maintain closure of the rotary door; wherein in moving the rotary door from the closed state to an open state, the spring's configured to stretch to allow the roller to move out of the slide passage.