A brief history of the invention of screws

The first person to describe the spiral was the Greek scientist Archimedes (about 287 BC-2 BC12 BC). Archimedean spiral is a huge spiral in a wooden cylinder, which is used to lift water from one floor to another and irrigate fields. The real inventor may not be Archimedes himself. Maybe he just described something that already exists. Perhaps it was designed by craftsmen in ancient Egypt to use irrigation on both sides of the Luo Yi River.

In the Middle Ages, carpenters used wooden nails or metal nails to connect furniture with wooden buildings. /kloc-In the 6th century, nail makers began to produce nails with spiral lines, which can connect things more firmly. This is a small step from this nail to the screw.

Around A.D. 1550, the earliest metal nuts and bolts as fasteners appeared in Europe, all of which were made by hand on simple wooden lathe.

Screwdrivers (screwdrivers) appear around London 1780. Carpenters have found that tightening screws with a screwdriver can fix things better than beating them with a hammer, especially when fine-grained screws are involved.

1797, Maudslay invented the all-metal precision screw lathe in London. The following year, Wilkinson made a nut and bolt making machine in America. Both machines can produce universal nuts and bolts. Screws are very popular as fixing parts because a cheap production method has been found at that time.

1936, Henry M. Philips applied for the patent of cross slotted head screw, which marked the great progress of screw basic technology. Different from the traditional slotted head screw, the edge of slotted head screw. This design makes the screwdriver center automatically and is not easy to slide down, so it is very popular. Universal nuts and bolts can connect metal parts together. Therefore, by the19th century, wood used for making machines and building houses can be replaced by metal bolts and nuts.