The first man to describe the spiral was the Greek scientist Archimedes (about 287 BC BC 212). The Archimedes Spiral is a huge spiral in a wooden cylinder used to raise water from one level to another and irrigate the field. The real inventor may not be Archimedes himself. Maybe he just described something that already existed.
Perhaps it was the ancient Egyptian craftsmen who designed it to use irrigation on both sides of the Nile. In the Middle Ages, carpenters used wooden nails or metal nails to connect furniture and wooden structures. In the 16th century, nail-making workers began producing studs with spirals that could connect things more securely.
That's a small step from this kind of nail to the screws.
Before and after 1550 BC, Europe's first appearance as fasteners of metal nuts and bolts, are made on a simple wooden lathe by hand. The screwdriver (Rotary chisel) appeared in London about 1780 years ago.
The Carpenters found that using a screwdriver to tighten the screws was better than hammering with a hammer, which was especially true when it comes to fine-grained screws. Maudsley in London in 1797, he invented a precision screw lathe made entirely of metal. The following year, Wilkinson made a nut and bolt making machine in the United States. Both of these machines produce common nuts and bolts.
Screws are fairly popular as fixtures, as a cheap method of production has been found. 1836, Henry · M. Philips applied for a patent for the screws of the cross recessed nails, which marked significant progress in the screw base operation. Unlike the traditional slotted nail head screws, the cross recessed screw head screws The edge of the slotted screws. This design makes the screwdriver automatically centered, not easy to slip off, so popular.
Universal nuts and bolts can connect metal pieces together, so by 19th century, the wood that made the machine to build the house had been replaced with metal bolts and nuts.
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- Industrial Application Of Screws
- Material Knowledge Of Bolts
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- Methods Of Inspection Of Screws
- Test For Thickness Of Screw Coating
- The Application Scope Of The Screw
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