Omnidirectional Adjustment-oriented Positioning Device of Office Chair Armrest

Abstract

An omnidirectional adjustment-oriented positioning device of an office chair armrest includes two parallel inner links pivotally connected between an armrest rotation fixing unit and a rotation base. The inner links are enclosed in outer links to form a parallel four-link swing link component. The rotation base is axially disposed at a pad. An armrest component capable of horizontal rotation and displacement is disposed at the armrest rotation fixing unit. Inner and external wheel components with bevel gears meshing with each other are disposed between upper ends of the outer links and the armrest rotation fixing unit. Positioning gears which mesh with each other are disposed at the armrest rotation fixing unit. A positioning wheel is mounted at the armrest rotation fixing unit and rotatable such that a rotation component for rotating the inner wheel component abuts against the inner wheel component and thus drives the positioning wheel to move outward.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The present invention relates to an omnidirectional adjustment-oriented positioning device of an office chair armrest, characterized in that: a swing link component of a parallel four-bar linkage device is mounted on each of the two sides of a pad; an armrest component capable of forward, backward and rotational positioning is disposed at an upper end of the swing link component such that the positions of armrests can be adjusted vertically, forward, backward and laterally while keeping the horizontal posture of the armrests; and a device which is easy to adjust and exercise positioning control is disposed at the pivotal connection point of the armrest component and the swing link component.[0003]2. Description of Related Art[0004]Armrests disposed on the two sides of a conventional office chair are stationary, as the armrests are fixed to the two sides of a pad from below and thus cannot be adjusted any more in whateve...

AI Technical Summary

Benefits of technology

The present invention provides an office chair armrest with an omnidirectional adjustment-oriented positioning device. The armrest component is axially disposed at the lower end of a swing link component of a parallel four-bar linkage device and axially disposed on each of the lateral sides of the chair as well. The armrest component can swing upward and downward and rotate horizontally. The positioning device includes a swing link component and inner and outer links, and the armrest component is positioned at the pivotal point of the swing link and the outer links' upper ends. This allows for three-dimensional adjustment of the armrest component, allowing for ergonomic and convenient adjustment. The parallel four-link mechanism of the swing link component looks neat and is less likely to clamp the user's fingers inadvertently.

Problems solved by technology

Hence, the aforesaid two situations occur, because the positions of the armrests cannot be adjusted laterally.

However, armrest devices capable of three-dimensional adjustment have disadvantages.

First, their assembly process is never smooth for structural reasons.

Second, its adjustment process must be carried out stage by stage and direction by direction and thus never occurs at one go; hence, it is inconvenient to carry out the adjustment process.

Third, due to poor design of adjustment positioning structures, not only are the armrest adjustment devices rarely operated ergonomically, but a parallel four-bar linkage device which supports the upper portion of the armrest may also clamp the users' fingers inadvertently and thus has to be enclosed by a casing for shielding sake; however, the shield is seldom satisfactory but definitely adds to structural complexity and causes difficulties to the assembly process, not to mention that it compromises the appearance of the device.

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