Operator Cab Armrest Geometry for Smooth Lever Operation
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Solution Overview
Problem
In wheel loaders, the operator's arm movement is interfered with by the armrest while operating the work implement lever, leading to inefficient operation due to varying arm positions and inclinations.
Innovation Solution
The operator's cab design includes an armrest with a sloping upper surface that decreases in height towards the operator's seat, allowing for smoother operation of the control lever by accommodating the natural movement of the operator's arm, with a wider front portion and narrower rear portion to support the arm effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a conventional armrest with a flat upper surface is used, then the armrest provides stable support, but it interferes with the operator's arm movement when operating the work implement lever
Solution Approach 1:
The armrest's upper surface is designed with different local qualities: the front portion has a larger width and includes an inclined portion that decreases in height toward the operator's seat, while the rear portion has a smaller width. This local variation in geometry allows the armrest to accommodate the dynamic movement of the operator's arm during lever operation while maintaining stable support when the arm is at rest.
2Adaptability or versatility
If the armrest has a uniform width, then the structure is simple, but it cannot accommodate the varying positions of the operator's arm during operation
Solution Approach 1:
The armrest employs asymmetric design in its upper surface geometry, where the front portion has a larger width and includes an inclined portion, while the rear portion has a smaller width. This asymmetric configuration is specifically tailored to match the natural movement pattern of the operator's arm during lever operation, providing adaptive support without requiring complex adjustable mechanisms.
Data Source
AI summary
An operator's cab includes an operator's seat provided on a floor surface, a control lever that is provided laterally to the operator's seat and is operated at least toward the operator's seat, and an armrest that includes an upper surface and is provided laterally to the operator's seat in the rear of the control lever. A front portion of the upper surface is larger in width than a rear portion of the upper surface. The front portion of the upper surface includes an inclined portion. With the floor surface being defined as the reference, the inclined portion decreases in height toward the operator's seat.