The principle of automatic umbrella is: there is a pressure spring sheath outside the umbrella opening pressure spring, the pressure spring protective sleeve is sleeved in the skeleton connecting sleeve, the skeleton connecting sleeve is provided with radial clips, the two ends of the clips are wedge-shaped and can slide left and right, there is a spring bolt on the outside of the skeleton connecting sleeve, and there are sliding multi head spiral inner and outer tubes above the umbrella handle, with matching multi head threads between them, When the umbrella is closed, rotate the sliding outer and inner sleeves to stretch out and tighten the umbrella opening compression spring. After it is in place, the clip on the skeleton coupling can position the umbrella opening compression spring.

　　The spring umbrella closing device can close the umbrella by pressing the closing pressure spring between the umbrella top skeleton coupling and the opening skeleton coupling. The opening pressure spring can open the umbrella, tighten the closing pressure spring, pull down the spring bolt, slide the clip outside, close the umbrella by closing the closing pressure spring, and rotate the sliding spiral outer tube to compress the opening pressure spring and prepare for opening the umbrella.

　　The English umbrella comes from the Latin umbrella, which means shading and shadow. Umbrella materials generally include malleable cloth, and other materials and entanglements that can be used as skeletons. When in use, the umbrella is held up by hand. Although the primary intention of the umbrella when it was invented was to block the sun, it is now more often used as a tool to keep out the rain in rainy days. Other effects of umbrellas include ornaments, crutches and even weapons. Liang Suji's umbrella in Hong Kong is one of the umbrellas that can be used as weapons.

　　In China, the umbrella was invented by Luban's wife in 1000 BC. The umbrella is called "a movable house". In Britain, umbrellas were not used until the 18th century. Umbrellas were once women's exclusive products, indicating women's mood for love. Put up your umbrella to show your constancy to love; Holding an open umbrella in my left hand, mark "I have no leisure time now". Shake the umbrella slowly, indicating no decision or distrust of the umbrella; Lean your umbrella on your right shoulder to indicate that you don't want to see you again.

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