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1 results about "Door space" patented technology

In mathematics, in the field of topology, a topological space is said to be a door space if every subset is either open or closed (or both). The term comes from the introductory topology mnemonic that "a subset is not like a door: it can be open, closed, both, or neither".

A ring movable door structure

ActiveCN224432343UDoor spaceClassical mechanics
This utility model discloses a circular movable door structure, including an arc-shaped door and a circular track. Several roller assemblies are arranged on the back of the arc-shaped door, and the circular track is inserted into the roller assemblies. Each roller assembly includes a roller frame mounted on the arc-shaped door, with two fixed rollers inside the frame. An adjusting roller is located on one side of each fixed roller. The circular track is located between the fixed rollers and the adjusting rollers. Several power components are arranged on the inner surface of the arc-shaped door, and several damping components are arranged on the circular track. This utility model, by using an arc-shaped door and a circular track, achieves circular movement. Compared to traditional door structures, it eliminates the need for a large opening space, enabling efficient passage and spatial separation within a limited space. The damping components provide a damping and shock absorption effect when the arc-shaped door opens and closes, preventing impact damage to the cabin and avoiding hand trapping.
Owner:SHANDONG QINOXYGEN HEALTH TECH CO LTD +1