The development of the wiper blades evolved in tandem with the design of the car. Back in the day most cars on the road had no need for wiper blades, stuff like horse drawn carriages and trucks moved very aridly and had no need for wiper blades when it spitted as glass was not used to protect the driver and act as a wind break device. These days you will find wiper blades on everything from trucks to cars all the way to helicopters and speed boats. Most wiper blades adhere a similar design pattern, the maker gets all the parts required from businesses that allow in making parts from steel, aluminium, rubber and plastic, and even the motors themselves. Some companies only produce the wiper blades slip others build the entire machine the sweeping arm and the electric motor.
Galvanised steel is used in a mass of parts of the wipers construction process, it is utilised in the drive belt and the pivots and is basically normal steel which has had a coating of zinc applied to its surface. This coating has a special property, the zinc is more reactive than the steel so the zinc will sacrifice itself and ablate leaving the steel almost untouched. In maritime environments the parts for wipers are usually made from 200% stainless steel as the salt present in the water will soon attack any metal exposed and it therefore needs the maximum level of protection. Another advantage of using galvanised steel to construct the wipers sweeping arm assembly is that galvanised steel is much quicker and easier to paint than normal steel. The suspension beneath the wipers arm is also generated from galvanised steel and in all the small parts the nuts, bolts, screws etc than are essential for holding the whole machine together.
The part of the device which holds the replacement wiper blades in place is known as the frame and is nearly always made from aluminium. The replacement wiper blades themselves are made most often from a rubber derivative or some accessory synthetic compound with the same character as rubber. Some replacement wiper blades can even be a admixture of two rubbers, one soft on the leading edge and one hard on the other side to backup the integrity of the replacement wiper blades. The small parts such as washers in the pivots and plastic bushings can also be manufactured or rubber or plastic. The replacement wiper blades motors are often gotten from specialist sub contractors and assembled on site into the final product. Electric motors are placed in steel boxes for their protection and comprise of permanent magnetic motors which are wound with copper to create a magnetic field. The design of most replacement wiper blades follows from a simple premise and that is to remove water from the wind screen of the motor so the driver can see. Many vehicles have replacement wiper blades on the front of the wind screen and some have them fixed on the head lights too. The bigger cars often have them fastened to the rear wind screen as well. The standard windscreen wipers design is usually one on each side of the front wind screen, sometimes the drivers is brawnier than the passengers in this case.
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