Many bolts are being used in a every modern society.
As for the use, a bridge and a building, the railroad, the
car, the household electric appliances are in every place.
Then, depending on the purpose of the use, the lightening of
a bolt However, in the way of shaving and excavating the
head of the conventional bolt, there is a limit in the
lightening.
So, I thought about the method which it cut down the shaft part of the bolt. The way reduces a cylindrical screw part to the equilateral triangle. Then, it cuts a screw in the mountain ridge part of the equilateral triangle. If making this form, the weight of the bolt can make it 40 percent light. |
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▲Equilateral triangle
bolt▲
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