Why does a thermos have a lid at the bottom?

Most people have used a thermos in different situations. It becomes especially relevant during hikes and long journeys. The main purpose of a thermos is to maintain the temperature of a hot drink or food for a long time.

The design and purpose of a thermos

Nowadays, you can find various models of thermoses on store shelves. They differ in purpose, appearance, and material used for creation. And also in terms of the quality of the function - heat preservation.

Almost everyone encountered the familiar structure and design elements. The main role is played by the flask, in which drinks or food retain their original temperature. A tightly screwed cap helps accomplish this purpose.

But some models contain parts whose purpose is difficult to immediately determine. In our article we will talk about special lids located at the bottom of thermoses.

IMPORTANT! To detect this element, you should unscrew the top cover and carefully examine the inside; for convenience, you can use a flashlight.

Which thermoses have a lid at the bottom?

Not all products in this category have an unusual lid located on the bottom surface.Most often it is used in models with glass bulbs inside a metal body.

Due to the peculiar arrangement of the parts, an air gap is formed between the internal and external elements. If the bulb is not securely fixed, it will dangle inside the structure. This will lead to its breakdown during further use.

Therefore, special bolts and nuts were developed for fastening and fixing. Thanks to the thread, you can independently adjust the fastening force and, if necessary, disassemble the structure for washing.

How to use the lid on the bottom of a thermos

If you come across this model or find an old thermos in which this element was used, you need to know the rules for its use.

Possibilities

• The threaded lid creates an additional fastening for the glass bulb located inside the main body. Thanks to this, it does not wobble and stands securely in the case.
• Thanks to the lid, an air gap is created.

REFERENCE! Air, being a poor conductor of heat, maintains the temperature of the drink and extends the time the thermos is used.

• In addition, the lower element provides additional tightness. In case of rubbing and wear of the silicone layer at the top, you can adjust the position of the flask and press it.

How to use

Using this design element is quite simple. To adjust the position, you need to tighten the nut at the bottom of the housing. If necessary, you can loosen or tighten it. To do this, you need to twist the nut along the thread.

REFERENCE! To prevent breakage, there is a special compressible ring underneath that will prevent the flask from breaking. Therefore, you don’t have to worry about the twisting force.

Over time, parts break and become unusable; ensure the integrity of the structure. In case of external defects, it is worth replacing parts or buying a new product.