Sit-Down Counterbalanced Forklift With Low Operator Floor
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Solution Overview
Problem
Existing lift trucks compromise ergonomics, with high operator compartment floors requiring multiple steps for entry and exit, limited visibility, and restricted leg movement due to elevated components, leading to operator discomfort and reduced productivity.
Innovation Solution
A modular lift truck design with a common chassis that incorporates a low, broad operator compartment floor, integrated steering and control mechanisms, and a seat that rotates and slides for improved visibility and comfort, along with operator-inaccessible compartments for maintenance-free components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If truck components are arranged in a stacked vertical orientation to minimize truck length and width, then maneuverability is improved, but operator compartment floor height increases requiring multiple steps for entry and exit
Solution Approach 1:
The patent redistributes truck components along the longitudinal dimension of the chassis rather than stacking them vertically. The battery is positioned in the front chassis compartment, the hydraulic system in the rear chassis compartment, and the operator compartment is elevated above these components, creating a horizontal rather than vertical arrangement that reduces floor height while maintaining compact dimensions.
2Ease of manufacture
If operator compartment floor is positioned high to accommodate components, then component placement is simplified, but visibility and leg movement are restricted
Solution Approach 1:
The patent divides the chassis into distinct compartments: a front chassis compartment for the battery, a rear chassis compartment for the hydraulic system, and an elevated operator compartment above these segmented sections. This segmentation allows each component to be positioned in its own dedicated space while maintaining an overall low profile that improves operator visibility and leg movement.
3Reliability
If components are placed in operator-inaccessible compartments, then maintenance-free operation is achieved, but operator serviceability is reduced
Solution Approach 1:
The patent applies different accessibility characteristics to different components: the battery and hydraulic system are placed in operator-inaccessible chassis compartments for maintenance-free operation, while the operator compartment and its controls remain fully accessible. This localized differentiation of accessibility qualities allows the system to achieve both reliability through protected components and serviceability where needed.
Data Source
AI summary
A lift truck comprises a chassis, chassis compartment, power plant, plurality of wheels, lift assembly, operator compartment, and operator-accessible compartment. The chassis has a front side, a rear side, a left side, and a right side. The chassis compartment is situated between those sides and is operator-inaccessible. The power plant is located in the chassis compartment. At least one of the plurality of wheels is operably connected to the power plant to drive the truck. The lift assembly is attached to the chassis, has forks configured to lift a load, and is operably connected to the power plant. The operator compartment is above the chassis and attached to the chassis and has an operator compartment floor above the chassis compartment and along a bottom interior surface of the operator compartment. The operator-accessible compartment has an operator-openable cover, and an operator-serviceable component is located in the operator-accessible compartment.