Mell What is the purpose of a screwdriver?
A screwdriver is a tool that is used for turning screws. It consists of a metal rod with a flat or cross-shaped end that fits into the top of the screw.
What came first the screw or the screwdriver?
Some believe that screws, used as a fastener, and screwdrivers began to pop up some time in the 1400’s which is the first documented use of them. Although similar devices were used with armor and flintlock firearms on a less widespread scale at some point previously.
What is the purpose of flat head screws?
A flat-head screwdriver is a screwdriver with a wedge-shaped flat tip, used to tighten or loosen screws that have a straight, linear notch in their heads. This is arguably the most common tool on the planet—the ubiquitous flat-head screwdriver.
What is a cross screwdriver called?
A Phillips screwdriver has a head with pointed edges in the shape of a cross, which fit neatly into the cross slots of a Phillips screw. Phillips screwdrivers are available in five different sizes, ranging from zero(smallest) to four (largest).
Why are star screws used?
Star Drive The Star (also known as Torx) has a six-point, star-shaped drive that was developed mainly to enhance tamper resistance and ensure snug fits. The star design drivers cut down on the risk stripping the screw heads, slippage, or cam-outs, with tight, specific fits.
Who invented the electirc screwdriver in US the first?
The new auto industry needed a better screw and the Philips head screw, invented by Henry Phillips in the early 1930s, provided the solution for the US auto industry. The first electric screwdriver was developed by Black & Decker in 1923. The first models were corded.
Who invented flathead screwdriver?
The flat blade screwdriver was the first developed and was used in the early 1800s. This is possibly the second most common type of screw, with an x-shaped head that matches the X on the head of the screw. Invented by Henry Phillips and patented in the 1930s, the screw first became important in automobile manufacture.
How screwdriver is made?
Screwdrivers are made of very simple materials. Most screwdrivers start out as a steel bar and the handles are usually made of plastic. The steel tips are usually coated in nickel or chromium as well. At the start of the manufacturing process, coils of green wire are taken to the factory.
Who made the sonic screwdriver?
The sonic screwdriver made its Doctor Who debut with Patrick Troughton in Fury From the Deep (1968) written by Victor Pemberton. Unlike Terry Nation, the creator of the Daleks , Victor Pemberton has no rights to license his amazing creation.