Industrial Truck Control Lever Layout for One-Hand Ergonomics
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Solution Overview
Problem
Existing control elements for industrial trucks often lack ergonomic design, leading to inefficient operation and potential for accidental incorrect operation, especially when using work gloves or accommodating different hand sizes.
Innovation Solution
A control element with two control levers for two-axis movement, spatially separated to allow finger operation without gripping, featuring a convex lever end for palm contact and a shell-like housing with recessed buttons to prevent accidental activation, along with a slide switch and toggle switches for hydraulic functions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If control elements are arranged on a curved line corresponding to an actuating circle for fingers, then the control elements can be operated by a hand resting on the armrest, but the design does not accommodate different hand sizes and may cause accidental misoperation when wearing work gloves
Solution Approach 1:
The patent transitions from a two-dimensional curved arrangement to a three-dimensional spatial configuration. Control elements are arranged in space rather than on a flat curved surface, allowing operators with different hand sizes to reach and operate controls comfortably. The spatial distribution includes elements at different depths and angles, creating accommodation for various hand morphologies while preventing accidental activation through deliberate spatial separation.
2Adaptability or versatility
If control elements are densely arranged to maximize functionality, then more functions can be controlled, but accidental misoperation increases and ergonomics deteriorate
Solution Approach 1:
The control system is segmented into functionally grouped clusters rather than a dense uniform arrangement. Related controls are grouped together in logical units with sufficient spacing between groups. This segmentation maintains comprehensive functionality while reducing accidental misoperation through spatial separation of unrelated controls and creation of natural operational zones.
Solution Approach 2:
Different regions of the control panel have different densities and arrangements optimized for their specific functions. Frequently used controls are positioned within easy reach of the dominant hand, while less critical controls are placed in areas less prone to accidental activation. Each local area is optimized for its specific operational requirements rather than uniform dense packing.
3Measurement precision
If control elements require gripping to operate, then precision can be improved, but operation speed decreases and ergonomics worsen
Solution Approach 1:
The control elements incorporate dynamic activation mechanisms that adapt to the operator's input style. Controls respond to both deliberate presses and lighter tactile interactions, allowing operators to maintain precision while reducing activation force and time. The system dynamically adjusts sensitivity based on operational context, enabling faster operation without sacrificing accuracy.
Data Source
AI summary
Operating element for an industrial truck with two operating levers (12, 14) and at least one switch (22, 24) arranged between the operating levers, the operating levers (12, 14) each being designed for a two-axis movement (K) and being spaced apart from one another in this way, that with a hand positioned between the levers with your fingers, the operating levers can be actuated without changing your grip and the at least one switch between the operating levers can be actuated.