Due to the variety of screws that are used to make adjustments in different areas of the industry, there are also a wide variety of screwdrivers, which have been specially designed to facilitate the fixing of parts during the assembly of furniture, appliances and other objects of use. frequent.
The manual screwdriver is one of the most used tools in different workshops, but it is also common in homes around the world, since it allows you to adjust screws in different DIY projects. For this reason, it is important to know the types of screwdrivers that we can use according to each need.
Main types of screwdrivers
We can say that the small manual screwdriver has maintained its usefulness over time, however, the creation of new screws with different heads has led to the emergence of different screwdrivers as well. Let’s see some of the most used
This is the oldest type of screwdriver, since the first screws had the slot of the flat head, however, in the early twentieth century the automotive industry created different heads that are more practical and therefore streamline processes, for For this reason, today’s flathead screwdrivers are easier to center and stay in position. These screwdrivers are still the most widely used in carpentry today, but it is also true that the flathead screwdriver slides easily, which is why these screwdrivers are considered less safe than the other types, therefore they are no longer used in some industrial work.
The cross-shaped screw is named after the American engineer Henry Frank Phillips, who bought the patent rights to a screw originally designed in 1933 by inventor John P. Thompson. This is how the Phillips screwdriver arises, its main advantage being the automatic centering for faster screw placement. In addition, the Phillips screwdriver offers greater clamping with the screw to prevent slipping, allowing it to enter the work material completely straight. However, it is important to mention that in some cases this type of tool can deform the cross groove of the screw, especially if more torque is applied than necessary.
This is an improved Phillips screwdriver, since in addition to the cross-shaped tip, it incorporates 4 additional guides at 45 °. This allows a lower risk of slippage, increasing precision when inserting the screw. The pozidriv screwdriver has this name as an abbreviation for positive drive, which means positive drive. It was patented in Great Britain by the automotive company GKN and is used especially in Europe, which is why in the rest of the world it is part of the special screwdriver bits.
Although the pozidriv reduces slippage, in some cases it is necessary to apply a greater torque force, this is where the torx driver has a great advantage. In this case, the screw head has a parallel profile, so it does not have angles, but instead has a six-pointed star with a rounded shape, which considerably increases the contact area between the screwdriver tip and the screw head. , thus offering a great level of torque.
The name of this tool has to do with the Allen key, patented in the 20th century by William G. This is where the so-called Allen screw comes from and this is the reason why the hexagonal screwdriver exists. This can be either a T-shaped handle or completely straight. It is a very useful screwdriver when assembling furniture.
The mass production of the Ford Motor Company forced its engineers to replace the slotted screws with an invention patented in 1908 by inventor PL Robertson. It was a square head screw, which allowed very easy centering of the screwdriver. However, this type of tool is rarely used manually, being more common in electrical devices.
We could list many other types, such as precision screwdrivers, which are used in watchmaking and other very small screw work. There is also the 3-prong screwdriver, used in electronic devices such as video game consoles, mobile phones, digital cameras, among others.
For its part, the spanner screwdriver is rare, but very useful to prevent unauthorized access to the functions of certain devices, such as elevators, public toilets, train cars, etc. In addition, we must mention the triangular tip screwdriver, which comes in different sizes although it has very specific applications.
Know the parts that make up the screwdriver
Although it is a very simple device, for proper use it is important to know the parts of a screwdriver. First of all, we must point out the handle, which is the area of the tool holding, where we must exert force to tighten or loosen screws. This part of the screwdriver can be made of PVC, plastic resins or wood, but in some cases it is covered with another non-slip material that allows greater control and at the same time provides comfort. In addition, for electrical work, screwdrivers with insulating handles are used to increase safety.
Another important part is the core, which corresponds to a small joint area between the handle and the body of the screwdriver , which is why it is usually very resistant to mechanical stress. As for the body or rod of the tool, it is generally an alloy steel bar, which contains molybdenum, vanadium and chromium, which guarantees hardness for greater strength and durability. Both the thickness and the length of the body depend on the use that will be given to the screwdriver. A short, thick one can be sturdier, while a long, thin one can reach tight and difficult spots.
On the other hand, within the body of the screwdriver we can distinguish two areas; the blade and the tip. The first is the blade or mouth of the tool, which becomes thinner until it reaches the tip, which is also called the head. In the latter case, we refer exclusively to the final part of the structure, which is ultimately the most important, since it must make direct contact with the screw and allow it to be adjusted. Of course, the shape of the tip will depend on the screw type. In some cases, this tip is magnetic , making it easier to adjust the part.