Virtual-Pivot Armrest Mechanism for Ergonomic Forklift Support
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Solution Overview
Problem
Existing materials handling vehicles often have armrests that are either fixed or require costly adjustments, leading to discomfort for operators of varying heights as they must lean or elevate their elbows and forearms excessively to rest comfortably.
Innovation Solution
An adjustable armrest mechanism that pivots about a virtual pivot point and features a contoured pad sloping downward, allowing operators to rest their elbows and forearms comfortably without excessive leaning or elevation, with a locking device to secure the armrest in multiple positions, ensuring the operator's wrist remains in a neutral position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a fixed armrest is provided, then the structure is simple and cost-effective, but operators of varying heights experience discomfort as they must lean or elevate their elbows and forearms excessively to rest comfortably
Solution Approach 1:
The armrest apparatus is made adjustable rather than fixed, allowing it to move between multiple positions to accommodate different operator heights and preferences. The armrest can be repositioned along an arc-shaped path defined by the slot and guide member, enabling dynamic adaptation to various operator needs while maintaining structural simplicity.
2Ease of operation
If multiple separate armrest locations are provided for different operator sizes, then operator comfort is improved, but the device complexity increases
Solution Approach 1:
The adjustment mechanism is segmented into discrete positions defined by the arc-shaped slot and guide member, allowing the armrest to be positioned at multiple locations. This segmentation provides comfort for different operator sizes while maintaining a simple overall structure that avoids the complexity of fully continuous adjustment mechanisms.
Solution Approach 2:
The single armrest apparatus serves multiple functions by accommodating different operator heights and preferences through its adjustable positioning capability. Rather than providing separate armrests for different operator sizes, one multi-functional armrest with adjustment capability replaces multiple fixed positions, reducing device complexity.
3Ease of operation
If the armrest is adjustable to accommodate different operator heights, then operator comfort is improved, but the manufacturing cost increases
Solution Approach 1:
The armrest incorporates a simple dynamic adjustment mechanism using basic mechanical components (slot, guide member, locking device) rather than complex electronic or hydraulic systems. This allows the armrest to be adjustable for different operator heights while keeping manufacturing costs relatively low through the use of straightforward mechanical engineering.
Solution Approach 2:
The armrest position is adjusted by changing the physical parameter of its location along the arc-shaped path. This simple parameter change mechanism, achieved through the slot-guide member interface and locking device, provides adjustability without requiring complex manufacturing processes or expensive components.
Data Source
AI summary
An adjustable armrest mechanism is provided, which is adapted to be coupled to a vehicle frame. The armrest mechanism comprises a base fixed to the vehicle frame, armrest apparatus movably coupled to the base such that the armrest apparatus pivots about a virtual pivot point located in front of the armrest apparatus and the base, and a locking device for releasably locking the armrest apparatus to the base in one of at least two positions.