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Triangle bottle cap
Geometry creation principle:The diameter of the bottle is equal to outer diameter of the cap.The shape of the cap is a circle inside which there are three small circles tangent with it ,and Dividing it into three equal parts.Each central angle. Corresponding to the lines between points of contact and the centre of the circle,is 120°,and the sharp parts of it are removed.
The users are easily able to open the bottle with small strength ,and lift it with crooked forefinger and middle finger to hooking the cap .so it is especially suitable for both old and young,and women users.
XI`AN UNIVERSITY OF SCIENCE AND TEC
XI`AN UNIVERSITY OF SCIENCE AND TECHNOLOGY