Blocking plastic windows from children for 92 rubles with your own hands

We all have children; in the life of parents, nothing can be more important than the safety of their own child. I was faced with a task: install locks on plastic windows, the price of the cheapest option that I found on the Internet is 600 rubles, I need to lock 4 windows, a total of 2400 rubles. I think the price is unreasonably high, after some thought I came up with a brilliant idea. So let's get started.

Task: install a lock on a window for a price that is at least 2 times less than what is offered on the Internet for a ready-made solution, without losing quality and reliability.

Solution:

1. Purchasing the necessary materials.

2. Installation.

Purchasing materials

Let's move on to point 1, for one window we will need:

1. two metal corners;
2. four self-tapping screws, 16 mm long;
3. braided metal cable with a diameter of 3 mm and a length of 20 cm;
4. cable clamp.

I went to a large, well-known hardware store, decorated in green colors (everyone understands that this is not an advertisement). And I bought it there:

• white metal corners 4 pcs. for 48 rubles;
• self-tapping screws 40 pcs. for 55 rubles;
• metal-polymer cable 10 meters, diameter 3 mm for 102 rubles;
• cable clamps 2 pcs. for 122 rubles;

I purchased it in such quantities because... They don't sell less. All materials are shown in Figure 1.

Let's move on to step 2 installation, for this we need the following tool:

1) Screwdriver or Phillips screwdriver;

2) A screwdriver with a 7 mm head or a 7 mm wrench.

The tool is shown in Figure 2.

Making child locks for plastic windows

Let's proceed directly to the installation:

1. First, screw the corners to the window sashes using self-tapping screws as shown in Figures 3 and 4.

2. Next, we pass the cable through the holes in the corners, selecting the required length so that the window can be opened for ventilation.

3. Using a clamp and a screwdriver, fasten the two ends of the cable.

That's it, the window lock is ready. Figure 6 shows an option for installing corners on two movable doors; Figures 7, 8 show an option for attaching corners when only one movable door needs to be blocked. The cable can withstand a tensile strength of 220 kg, which is quite enough for a child.

Cost totals

As a result, I spent 92 rubles 54 kopecks to block one window:

• 48/2 = 24 rubles for two corners;
• 55/10 = 5.5 rubles for 4 screws;
• (102/1000)*20 = 2.04 rubles per 20 cm of cable;
• 122/2 = 61 rubles for 1 clamp.

My benefit amounted to 600 rubles. - 92.54 rub. = 507.46 rubles, or (600/92.54)*100 = 648%.

I consider the task accomplished perfectly!