Adjustable Chair Armrest with Button-Lock Height and Pivot Pad
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Solution Overview
Problem
Conventional chair armrests lack adjustable height and angular position, leading to poor comfort and usability for users of different heights and causing friction during arm movement.
Innovation Solution
A chair armrest device with a telescopic mechanism and a control system that includes a positioning peg and actuating rod, allowing for easy height adjustment and pivotal movement within a predetermined range, using a button and elastic element for secure positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a telescopic rod with a knob is used for height adjustment, then the armrest height can be adjusted, but the adjustment operation becomes inconvenient and the positioning reliability deteriorates if the knob is not tightened
Solution Approach 1:
The patent replaces the conventional manual knob tightening mechanism with a button-actuated mechanical system. Pressing the button releases the positioning peg from the positioning groove, allowing smooth telescopic adjustment without manual tightening. The spring automatically returns the peg to engage with the nearest positioning groove when the button is released, providing both ease of operation and reliable positioning.
Solution Approach 2:
The positioning peg automatically engages with the positioning groove through spring force after the button is released. This self-service mechanism eliminates the need for manual tightening operations while ensuring reliable positioning at the desired height, resolving the contradiction between ease of operation and positioning reliability.
2Device complexity
If the pad angular position is fixed, then the structure is simple, but friction occurs between the skin and pad during arm movement requiring mouse operation
Solution Approach 1:
The patent transforms the fixed angular position into a dynamically adjustable one. The pad can rotate around the telescopic rod axis within a predetermined range, allowing users to adjust the angular position to match their arm movement patterns. This dynamic capability eliminates friction during mouse operation while maintaining structural simplicity through a straightforward rotational joint design.
3Adaptability or versatility
If multiple adjustment functions are added to the armrest, then adaptability improves, but device complexity increases
Solution Approach 1:
The patent combines height adjustment and angular position adjustment into a unified structure. The telescopic rod serves dual purposes: it enables height adjustment through telescopic movement and angular position adjustment through rotation around the same axis. The button-actuated positioning mechanism is integrated into this unified structure, providing both adjustment functions without requiring separate complex mechanisms.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables easy and secure height adjustment and angular movement of the armrest pad, enhancing user comfort and reducing friction during use.
Implementation Method 1
an elastic element, and a pad. The actuating rod includes a rectilinear rod portion having a lower portion and an upper portion. A positioning peg is formed on the lower portion of the rectilinear rod portion
Data Source
AI summary
A chair armrest device includes a main frame and an outer sleeve coupled to the main frame. The outer sleeve includes an insertion portion having a plurality of positioning grooves. A cover is mounted on top of the outer sleeve. An inner sleeve includes a shank inserted into the insertion portion of the shank. An actuating rod is pivotably received in the inner sleeve. A positioning peg is provided on the actuating rod for releasably engaging with one of the positioning grooves. A guiding peg is provided on the actuating rod and is received in an inclined guiding groove of a button. A pad is mounted on top of the inner sleeve and is pivotable relative to the main frame. The button can be pressed to pivot the actuating rod to thereby disengage the positioning peg from the positioning groove for adjusting a height of the pad.