There is no disadvantage in buying chairs. One article teaches you to distinguish between four kinds of seat chassis.
The layman generally pays attention to the appearance, function and price when choosing office chairs, while the insider knows that the technical core of the office chair is the design and manufacture of the chassis, and the safety core is the level of the pressure rod. As long as these two key points are grasped, the selected seats are generally durable, comfortable and safe.

The following are the chassis types of mainstream seats on the market.

 

1. regular three-function chassis

This kind of chassis is a large batch of regular chassis. It has two control devices, a control rod and a knob. It has three basic adjustment functions: backward locking, seat cushion lifting, and backward elasticity adjustment.

 

Pull out the right control rod to release the back cushion back locking state, and the user can adjust the back cushion back angle by pressing the back cushion; insert the right control rod to lock the back cushion back angle. Rotate the control lever clockwise to adjust the seat cushion height.

 

Rotate the cylindrical knob at the bottom of the chassis clockwise to enhance the backrest elasticity, and rotate counterclockwise to weaken the backrest elasticity.

 

regular three-function chassis has a seat back recline angle of about 125-130 °.

 

2. Engineering four-function chassis

 

One feature is that the chassis uses wire control technology, which avoids the problem that the control device extends directly from the mechanism regular the chassis, and the positions of each control function are scattered and unsightly.

 

 

Another feature is the addition of the cushion front and rear adjustment function. The depth adjustment function of the seat cushion allows the seat cushion to be suitable for users with different leg lengths. The user makes the thighs sit fully on the cushion by moderate adjustment. Increasing the contact area between the body and the seat cushion is the best way to reduce the pressure on the lower limbs. The smaller pressure makes the user feel more comfortable and the sitting time is more durable. The cushion depth adjustment function is one of the main differences between ordinary office chairs and engineering office chairs.

 

There is also a feature that is not very obvious. The elevation angle behind the chair of the engineering four-function chassis is slightly larger than that of the regular three-function chassis, about 130-135 degrees.

 

There are many styles of engineering wire-controlled four-function chassis, some using buttons, some using levers, and some using wheels. However, they all have the above basic characteristics.

 

3. Engineering five-function chassis

The ergonomic computer chair with seat cushion angle adjustment function requires the design of the chassis and seat cushion to be closely linked together, so the chassis, seat cushion and chair back are pre-installed together when produced in the factory. After the customer gets the seat, he only needs to connect the tripod to the upper part of the seat with a pneumatic rod, which is very easy to install.

 

4. Self-responsible four-function chassis

 

In practice, it is found that for computer chairs with manual backward elasticity adjustment function, users need to adjust 2-3 times to find the right backward elasticity. The operation is complicated, and many users basically ignore this function and rarely use it. Therefore, the self-contained heavy chassis came into being. Through its unique internal device, it directly converts the weight of the user sitting on the seat cushion into the backward elasticity, so that users of different weights can get the corresponding backward elasticity when sitting on it.

The backrest of the self-important chassis is slightly smaller, about 120-125 degrees.

In addition to the functionality of the chassis, its explosion-proof steel plate also bears the safety function, but the accessory that can best guarantee the safety of the seat is still the pressure rod.

 

In the past, the news of the explosion of the pneumatic chair was often reported in the newspapers. The reason was that the black-hearted manufacturers used inferior three-no pneumatic rods. This kind of inferior pressure rod has not been certified by the state. It is filled with air instead of inert gas. It also uses very thin inferior steel on the steel, which eventually leads to tragedy.