Chair Armrest Guide Slot Structure for Stable Hand Positioning
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Solution Overview
Problem
Conventional adjustable armrest structures for chairs require frequent adjustments as users move their hands, leading to discomfort due to changing armrest positions.
Innovation Solution
An adjustable armrest structure featuring a guiding slot with arcuate recesses and a guide member made of plastic, allowing the screwing element to move resiliently along the recesses, ensuring the armrests maintain a stable distance from the user's hands without external force.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the screwing element moves along the slot horizontally to adjust the armrests, then the armrest distance can be adjusted, but the armrests can be easily moved by user's hands requiring frequent adjustments
Solution Approach 1:
The guiding slot changes from a straight horizontal path to an arcuate curved path, allowing the movable member to follow a dynamic trajectory that maintains optimal armrest positioning relative to the user's hands during adjustment
Solution Approach 2:
The guide member acts as an intermediary between the screwing element and the movable member, translating the linear motion of the screwing element into curved motion of the movable member through the arcuate guiding slot
2Weight of moving object
If the guide member is made of plastic material with hollow spaced rooms, then the structure becomes lighter and more resilient, but the manufacturing complexity increases
Solution Approach 1:
The guide member incorporates hollow spaced rooms creating a porous or cellular structure that reduces weight while maintaining structural integrity and providing resilient properties for smooth operation
Solution Approach 2:
The guide member uses plastic material that combines lightweight properties with sufficient strength and resilience, achieving a balance between weight reduction and functional requirements
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 comfortable and stable armrest positioning, preventing frequent adjustments and ensuring hands remain comfortably against the armrests by allowing smooth and secure engagement of the movable member with the chair armrests.
Implementation Method 1
the guide member is actuated to move along the arcuate recesses resiliently
Data Source
AI summary
An adjustable armrest structure for a chair is an adjusting assembly fixed to bottom ends of two armrests on two sides of the chair and includes a body, two side rails, and a movable member. The body includes a guiding slot formed on a bottom end thereof to fit a screwing element and to engage with the movable member. The guiding slot of the body includes a plurality of arcuate recesses arranged around the two sides thereof to fit two projections fixed on two sides of a guide member respectively. An actuating member includes a bore disposed thereon and is fixed to the guide member. The screwing element is inserted through the bore of the actuating member and an orifice of the guide member. A screw segment of the screwing element is screwed with the aperture of the movable member.