Adjustable Tiller Offset for Forklift Maneuverability
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Solution Overview
Problem
Conventional pedestrian-operated forklift trucks require a minimum aisle width equal to their length for operation, leading to wasted storage space due to the fixed alignment of the tiller with the steerable wheel, limiting maneuverability in tight spaces.
Innovation Solution
A motorized truck with a tiller-controlled steerable wheel that includes a steering motor and controller allowing for adjustable angular offset between the tiller and the steerable wheel, enabling the truck to be driven straight ahead or backwards with the tiller offset, and a realignment mode to change the steering axis, enhancing maneuverability in narrow aisles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the tiller is fixed aligned with the steerable wheel, then the steering mechanism is simple, but the truck requires a minimum aisle width equal to its length for operation
Solution Approach 1:
The patent applies the dynamics principle by making the angular offset between the tiller and steerable wheel adjustable rather than fixed. The steering motor controller can vary the angle of the steerable wheel relative to the tiller, allowing the system to adapt to different operational requirements. This enables the truck to operate in narrower aisles by adjusting the steering geometry dynamically, resolving the contradiction between simple steering mechanism and required aisle width.
Solution Approach 2:
The patent changes the parameter of angular offset between the tiller and steerable wheel from a fixed value to a variable parameter. By allowing the steering motor controller to adjust this angle, the system can optimize its performance for different aisle widths and operational scenarios. This parameter change enables the truck to reduce the minimum required aisle width while maintaining effective steering control.
2Device complexity
If the tiller is fixed aligned with the steerable wheel, then the structure is simple, but the steering space is wasted storage space
Solution Approach 1:
The dynamic adjustment capability allows the truck to optimize its steering geometry for different operational needs. When operating in narrow aisles, the system can adjust the angular offset to minimize the steering space required, thereby reducing the wasted storage space. This dynamic adaptation transforms the fixed geometric constraint into a flexible parameter that can be optimized for space utilization.
Solution Approach 2:
By changing the angular offset parameter, the system can reduce the steering space requirement and thereby minimize the wasted storage space. The ability to adjust this parameter allows the truck to operate more efficiently in tight spaces, converting what was previously wasted steering space into usable storage space.
3Ease of operation
If the tiller is offset from the steerable wheel, then the truck can be driven straight ahead with the tiller offset to the side, but the steering control becomes more complex
Solution Approach 1:
The patent replaces the traditional mechanical linkage between the tiller and steerable wheel with an electronic control system. Instead of a direct mechanical connection that would be complex to manage with offset positioning, the steering motor controller uses electronic signals to adjust the wheel angle based on the tiller position. This substitution simplifies the overall control system while enabling offset operation.
Solution Approach 2:
The steering motor controller incorporates feedback mechanisms to monitor the tiller angle and adjust the steerable wheel angle accordingly. This feedback control allows the system to maintain proper steering geometry even when the tiller is offset from the wheel, simplifying the control requirements compared to manual mechanical adjustment systems.
4Adaptability or versatility
If the angular offset between tiller and steerable wheel is adjustable, then the truck can access tighter spaces, but the device complexity increases
Solution Approach 1:
The steering motor controller serves multiple functions: it controls the steerable wheel angle, adjusts the angular offset between tiller and wheel, and adapts to different operational scenarios. This multi-functionality consolidates what would otherwise require separate mechanical adjustment mechanisms into a single integrated control system, managing the complexity through functional integration rather than adding separate components.
Data Source
AI summary
A motorized truck with tiller such as a pallet carrier or forklift truck has a tiller-controlled steerable wheel 14 which is steered by a motor having an associated steering motor controller. The steering motor controller in a normal mode of operation detects movement of the tiller as it is rotated relative to the chassis to steer the truck, and outputs control signals to cause the steering motor to steer the wheel such that it follows the tiller angle with a fixed, predetermined offset (which may be zero or non-zero). In a realignment mode of operation, the controller can change the predetermined angular offset, and the controller can preferably align the wheel with the tiller or with an axis of the chassis. The truck can be maneuvred more easily into and out of tight spaces with the operator and tiller offset to the side of the truck. The tiller can also be offset manually from the wheel by decoupling the tiller and wheel, and thereby changing the predetermined offset for subsequent operation.