العجلات في الداخل والخارج .. عجلات في النوافذ .. الآلات التي نستخدمها كل يوم

Wheels inside and outside .. Wheels in windows .. The machines we use every day and how they work

Wheels inside and outside:

There are wheels all over the house that work for you, there are wheels in every window, in every clock, and in many kitchen appliances. Wheels are undoubtedly the most important parts of slippers, bicycles. .

Since wheels perform different tasks, they can be made in different sizes and shapes, some have smooth edges, others have serrated edges. Let's study some wheels that do you some service.

Wheels in windows:

One of the most difficult things is to raise a window in a train or a public car. But raising the windows of your home is an easy process, even though they are larger and heavier. So what is the reason for that? The small wheels called window rollers or window pulleys are what save you the effort. On each side of the window there are two wheels or pulleys. One on each side of the window. A chain or rope is fixed to the window, passed over the tractor and then fixed at its other end with a handle which is the balance weight. This heavy hanging handle helps to raise the window. But why are these tractors and handles not used in the windows of railway trains and public cars?

There are two reasons: First, the windows should remain closed in trains. And cars equipped with air conditioning machines, so that the air conditioning machines can work properly. As for trains and other cars, these handles make a rattle with every vibration. Second, the window frames should be wider so that these tractors and handles can be installed in them.

This means that the area of ​​the windows is reduced and narrow, and consequently the area that allows passengers to look out at the scenery they are passing by is reduced.