Chair with separate but interconnecting lumbar and thoracic supports

Abstract

The present invention relates to a chair with separate but interconnecting lumbar and thoracic supports. A back support is physically divided into a lumbar support and a thoracic support. The lumbar support is formed to be curvable, and the lumbar and thoracic supports are configured to be interconnecting. Thus, when a sitter tilts his / her upper or lower back backward for rest or tension relief, the lower back area of the sitter is comfortably brought into contact with and supported by the lumbar support with a backward tilt of a relatively large angle, and at the same time, the upper back area of the sitter is comfortably brought into contact with and supported by the thoracic support with a backward tilt of a relatively small angle. Therefore, the lumbar and thoracic supports share the task of comfortably supporting the lumbar vertebra and thoracic vertebra respectively. In addition, the chair has high posture stability without falling backward when a sitter tilts his / her upper and lower back far backward, and also has an elegant look.

Description

technical field [0001] The present invention relates to a chair with separate and interconnected lumbar support and chest support. More specifically, the present invention relates to a chair having separate and interconnected lumbar support and chest support, wherein the backrest is physically divided into a lumbar support and a chest support, and the lumbar support is formed to Curved, and the lumbar support and the chest support are configured to be interconnected with each other so that when the occupant leans his / her upper or lower back back for rest or to relieve tension, the occupant's lower back area comfortably contacts the lumbar support and is supported by the lumbar support at a relatively large angle of rearward tilt, while the occupant's upper back area comfortably contacts the chest support and is supported by the chest support at a relatively small angle. Angled back for support. Thus, the lumbar support and the thoracic support take on the task of comfortably...

AI Technical Summary

Problems solved by technology

[0005] However, in the conventional chair in which the elastic backrest for supporting the lumbar and thoracic vertebrae is integrally formed, since the spine of the human body is curved in an S-shape viewed from the side, when the occupant tilts his / her upper back and In a low back, the thoracic spine is tightly supported by the upper half of the backrest, but the lumbar spine is separated from the lower half of the backrest due to the large space between them so that the lumbar spine is not supported by the backrest

Since this phenomenon becomes worse near the boundary between the lumbar spine and the thoracic spine, there is a problem that it is a major cause of unfavorable strain on the waist or the boundary between the waist and the back or the seated person feels inconvenience

However, because the above-mentioned conventional chair 1' or 1" has rigidity such that the lumbar support 3 integrally formed at the seat 2 does not tilt backward, the lumbar support is not interconnected to the back support 4

In addition, because the backrest is upright and smoothly formed, when the occupant tilts the upper and lower back excessively, a gap is still formed between the lumbar spine and the backrest, so it is an ergonomically important feature in terms of comfort. unsatisfactory

Moreover, because the bending angle becomes large at the boundary between the upright lumbar support 3 and the backward-inclining back support 4, there is still a problem that this is causing the waist or the boundary between the waist and the back to become unfavorable. Primary cause of strain or occupant discomfort

[0008] In addition, since the metal back frame 4a of the conventional chair 1' or 1" has a bar shape exposed to the outside, there is a problem that it lacks aesthetics in appearance.

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