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With the growing population in cities, it is more and more crowded in carriages, and sometimes we even can not catch the handle on metro (or bus).
Free handle is a cupule-oriantied handle provide us a private handle to use freely, which can stick on the any plane surface of the carriage. By turning it of 90°,the volume of hermetical air in the cupule will be enlarged( under the affect of the mechanism), so as to change the air pressure in side the cupule and firmly stick the handle on the carriage surface. When you want to take it of , you only need to turn back of 90°.
Shanghai Maritime University