When pouring rain or blizzards pour outside the window, it is this small device that often affects the life of the driver and passengers. Few people think that in the early XX century motorists were forced to stop constantly to wipe the windshield by hand, risking being late or in an accident. The history of this invention is full of interesting facts and unexpected turns that go back to the era of the nascent automotive industry.
Many people mistakenly believe that windshield wipers They appeared simultaneously with the first mass models of cars, but this is not the case. For a long time, engineers believed that it was enough to simply lower the top of the windshield or lean out of the window to see the road. The situation has changed dramatically thanks to the observation of one woman, whose name should be known to every motorist.
In this article, we will explore in detail how the first mechanism was created, why the patent was not initially interested in anyone, and how a simple idea transformed into the complex electronic system we see today. You will learn about the technical nuances of brush evolution and why the original designs were far from perfect.
Mary Anderson and the Birth of an Idea in New York
The story goes that the inventor of the first effective windshield wiper was an American woman. Mary Anderson.. In the winter of 1902, she was traveling on a tram through snow-covered New York City and noticed that the driver constantly opened the cockpit door to clear the windshield of snow and slush. This not only slowed down the movement, but also created discomfort for all participants in the process due to the cold air.
Back home in Alabama, Mary designed a device that would allow the glass to be cleaned from inside the cabin without opening the doors. Its design was a spring-loaded lever with a rubber blade, which was mounted outside, and controlled by the driver through a hole in the frame. This was a revolutionary step, because hand-drive It allows you to control the clarity of the view without stopping the vehicle.
In 1903, Anderson received U.S. Patent No. 648,118 for her invention, which she called a "window cleaner." Despite its obvious utility, commercial success did not follow at first. Car manufacturers believed that the movement of the lever would distract the driver, and the need to clean the glass while driving seemed to them a far-fetched problem.
⚠️ Note: Initial patents often describe operating principles that are radically different from current implementations. Anderson’s design was purely mechanical and had nothing to do with electric motors.
Mary Anderson never sold her patent to a large corporation in her lifetime. She tried to offer it to a Canadian company, but was refused with the wording that the device has no practical value. After the expiration of the patent, when the safety As a priority, the industry has begun to introduce such systems.
The Competition of Ideas: Charlotte Bridgeman and John O'Hara
While Mary Anderson was trying to break through the wall of industrial indifference, other inventors were also working to solve the problem of visibility. In 1910, Charlotte Bridgeman received a patent for a device with a rubber scraper fixed to a frame that was driven by a cable. Its design was more complex and required the driver to use both hands, which made the control of the vehicle more complex. motorcar It's difficult.
Around the same time, John O'Hara offered his version, which was more like modern wipers but still required manual control. These inventions proved that the market demand grew with the increase in the speed of vehicles. However, none of the early models could match the simplicity and efficiency of the Anderson prototype.
The key point was that the early designs did not have automatic return in the starting position. The driver had to make a full cycle of movement of the lever forward and backward, which distracted from the road. It was this flaw that slowed down mass adoption until engineers began looking for ways to automate the process.
- 🚗 Charlotte Bridgeman used a system of cables and levers resembling a bicycle brake.
- 🌧️ John O'Hara focused on improving the pressing force of rubber tape to glass.
- ⚙️ All early models required the physical effort of the driver for each cleaning.
- 📉 None of the devices became popular due to the complexity of operation.
It is important to understand that in those years windshield Often it was not installed on cars at all, or it was vertical and small. Drivers used safety goggles and passengers hid under their hoods. Therefore, inventors faced not only technical, but also psychological barriers to perception of the need for cleaning.
The era of vacuum and electric windshield wipers
The turning point came in the 1920s, when engineers began looking for ways to free the driver's hands. The first mass solution was vacuum wipers, which worked due to the pressure difference in the intake manifold of the engine. When the car gained speed or climbed uphill, the rarity dropped, and the wipers began to work slower or stopped altogether, which was a serious drawback.
In 1926, the company Bosch It introduced the first electric windshield wiper that worked regardless of the engine load. This was a real breakthrough in the field. electrician. The electric motor provided a stable rotational speed, regardless of whether the car is in traffic or rushing along the autobahn.
Why did vacuum cleaners stop being used?
Vacuum systems depended on the engine. When a sharp acceleration or climb uphill discharge in the intake manifold fell, and wipers stopped right in the middle of the windshield, which was extremely dangerous in bad weather. Electric motors have solved this problem by ensuring a constant speed of operation.
With the introduction of electrical systems, it became possible to add new features such as intermittent operation and glass washer. Engineers began experimenting with the shape of the levers and the angle of the brush. The first ones came. two-speedThey allowed to choose the intensity of cleaning depending on the intensity of precipitation.
⚠️ Note: When switching from vacuum to electrical systems in older cars, wiring alterations and the installation of additional fuses were often required, since the old power grids were not designed for new loads.
By the middle of the XX century, electric wipers became the standard for all manufactured cars. This allowed for an increase in windshield area, making panoramic viewing a reality rather than a luxury. Without a reliable cleaning system, such glazing would be simply dangerous.
Evolution of brush design: from metal to graphite
If the mechanism of the drive changed dramatically, then the working part itself - the brush - evolved more smoothly, but no less significantly. The first brushes were a metal frame, into which a rubber tape was inserted. The metal quickly oxidized, frozen in winter and scratched glass when sand hit, which required constant constant use of the metal. replacement.
In the 1960s, the company Trico I presented brushes with a solid metal frame, which fit better with curved glass. However, a real revolutionary leap occurred with the appearance of frameless brushes at the end of the XX century. They use an elastic steel plate inside the rubber, which provides an ideal fit along the entire length of the arc.
Modern materials include graphite spraying, which reduces friction and eliminates the characteristic creak. Also, there were brushes with a winter performance, where the mechanism is closed with a rubber cover that prevents the freezing of snow. Hybrid brushes combine the aerodynamics of frameless models and the rigidity of frame models.
| Type of brush | Frame material | Advantages | Deficiencies |
|---|---|---|---|
| Framework | Metal | Low price, universality | Scream, freeze, oxidize |
| Frameless | Steel plate in rubber | Aerodynamics, uniform pressing | High price, require selection by model |
| Hybrid | Plastic + metal | Durability, good pressing. | High cost, complex construction |
| Winter | Rubber case | Protection from ice and snow | Sailing at high speeds |
Choosing the right type of brush directly affects safety. Cheap analogues can leave untreated areas or quickly lose elasticity under the influence of ultraviolet light. Therefore, when buying, it is important to pay attention not only to the price, but also to the price of the product. rubber-mix.
Modern technologies and rain sensors
Today, car wipers are a high-tech node integrated into the overall safety system of the car. The advent of rain sensors has allowed the process to be fully automated. A special optical sensor located at the upper edge of the windshield analyzes the amount of water and independently regulates the speed and frequency of operation. gear-motor.
Modern systems also take into account the speed of the car. The higher the speed, the more often the wipers are triggered to compensate for the faster flow of water to the glass. Some premium cars come with systems that lift the brushes to their extreme parking position so they don’t freeze overnight.
If your car has a rain sensor, when replacing the windshield, it is necessary to calibrate it. Without this procedure, the automatic mode may not work properly or at all.
Engineers continue to experiment with ultrasonic cleaning and hydrophobic coatings that could eliminate the need for mechanical wipers altogether. However, the traditional scheme remains the most reliable and effective in all weather conditions, from rain to wet snow.
Regular check of the level of liquid in the tank and the condition of the washer nozzles - an obligatory part seasonal. Dried liquid or clogged nozzles can negate the work of the most expensive wipers.