Column unit for chair

Abstract

The present invention relates to a column unit for a chair, wherein the column unit for a chair is compact and can improve durability against lateral forces. The present invention relates to a column unit for a chair, in which the height thereof is controlled by upward and downward movements of a spindle assembly, wherein the column unit comprises: an outer pipe comprising an inclined portion of which the diameter gradually becomes larger as it approaches a front end thereof; an inner pipe which is inserted into the outer pipe to form a space portion between the inclined portion and the inner pipe; and a spindle guide which is inserted into the inner pipe to guide the upward and downward movements of the spindle assembly.

Description

technical field [0001] The present invention relates to a pillar unit for a chair in which an inclined portion of an outer tube is directly fixed to a chair base to provide an aesthetic appearance and to diversify the design of the chair; more particularly, the present invention relates to A pillar unit for a chair that has a compact configuration and can improve durability against lateral force applied to its shaft. Background technique [0002] It is well known in the art that air cylinders are used in height control devices for chairs. like Figure 1a and Figure 1b As shown, the cylinder includes: an outer tube 5; a main shaft assembly 2, which is inserted into the outer tube 5, and when the gas flow path of the valve 8b is changed, the main shaft assembly 2 moves upward or downward, wherein the The exposed end of the piston rod 6 is fixed to the bottom surface of the outer tube 5 ; and the spindle guide 4 is provided in the upper side of the outer tube 5 for guiding a...

AI Technical Summary

Problems solved by technology

[0009] However, the disadvantages of conventional strut units for chairs are: Figure 1b As shown, when the user sitting on the chair moves forward, backward, left or right (in any direction along 360°), bending moment is repeatedly applied to the strut unit, so that through the fixing pin 7 and the outer tube 5 The attached spindle guide 4 gradually disengages over time, causing the fixation to be released

[0010] In other words, there is a disadvantage that, in the case where the chair has been used for a long time, when the user sitting on the chair moves forward, backward, left or right, the bending moment, the main shaft guide 4 rises (is pushed up) along the upper part of the outer tube 5, thereby significantly reducing the durability of the chair pillar unit

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