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The development of the screwdriver

  • Author:youfu-liubei
  • Release on:2019-07-23
When we talk about a screwdriver, we will think of it.
One of the most used tools in life

A Screwdriver is a tool used to twist a screw to force it into place. It usually has a thin wedge-shaped head that can be inserted into the slot or recess of the screw head. The Beijing-Tianjin-Hebei and Shaanxi-Western dialects are called “change cones”, Anhui, Henan, and Hubei are called “starters”, the central and western regions are called “changing knives”, and the Yangtze River Delta region is called “spinning chisels”. There are two main types (negative sign) and cross (positive sign). Also common are hex screwdrivers, including both internal and external hex.
Development History
The Phillips and Phillips screwdrivers were invented by Henry Phillips in the 1930s. First used on the assembly line of the car. So Phillips and Phillips screwdrivers are also known as Philips screws and Phillips screwdrivers.
In order to apply a small torque to the slotted screw, it is thought that a slot is opened in the screw head, and the screw can be easily tightened and loosened with a corresponding one-shaped screwdriver, but with the rapid development of science and technology, the screw The application is becoming more and more widespread, and the shortage of screws and slotted screwdrivers is also present. First, once the slot of the screw head is damaged, the screw cannot be unscrewed. The longer the length of the slot, the easier it is to be destroyed during the screwing process. In order to shorten the length of the notch, improve the ability of the notch to resist damage, and transmit the same amount of torsion, it is thought that the same torque can be withstood by the cross groove, but the length of one notch is half short and resistant to damage. The ability has been greatly enhanced. The screwdriver is originally a figure-shaped screw that cannot be used for the cross recess. Only a separate Phillips screwdriver and a Phillips screw are produced. There are two kinds of screwdrivers.
   The slotted screws are used since the machine. It is impossible to replace the screws on the old machine. The Phillips screwdriver can not be used on a slot. The slotted screws are still in production, so keep a flat-blade screwdriver. In this way, most of the new machines use cross-notch screws, and the old ones are still in use, and there are cases where two types of screwdrivers are used at the same time.
Technical principle
  The screwdriver is used to paint the lid and utilizes the working principle of the lever. The greater the distance from the power point to the fulcrum, the more labor-saving, so the long screwdriver is more labor-saving than the short screwdriver.
The screwdriver works to tighten the screw and uses the principle of the axle. When the wheel is larger, the effort is less, so using a thicker screwdriver is more labor-saving than using a thin screwdriver to tighten the screw.
basic skills
  When repairing the phone, you need a screwdriver to open the case (some phone cases are dark-button type without a screwdriver). Different mobile phones have different specifications, and some models also have special screws that require a special screwdriver. In addition, you need to prepare some small flat-blade screwdrivers and small Phillips screwdrivers. In the selection of such tools, the A and B sets of batches should be used, which includes almost all the open-shell tools of mobile phones. When opening the case, select a suitable screwdriver according to the type and specifications of the fixing screws on the case. If the selection is not appropriate, it is possible to flatten the slot of the screw and cause slippage.