Forklift Steering Wheel Adjustment Mechanism
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Solution Overview
Problem
Industrial trucks with standing operators require a steering wheel adjustment system that offers a large vertical adjustment range and additional horizontal and inclination adjustments to accommodate operators of varying sizes, while maintaining a compact design and low construction costs.
Innovation Solution
The adjustment device features a bearing bracket attached to the drive part, a fastening bracket with a guide, and an intermediate bracket connected in an articulated manner, allowing simultaneous vertical, horizontal, and inclination adjustments of the steering wheel through a forced link guide mechanism, utilizing guide grooves and pins with bearing bushes for low-force operation and a clamping device for easy positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the steering wheel is positioned vertically above a drive unit or battery compartment, then the installation space for the adjustment mechanism is minimized, but the vertical adjustment range required to accommodate operators from the 5th percentile woman to the 95th percentile man becomes difficult to achieve
Solution Approach 1:
The adjustment device uses a nested bracket structure where the mounting bracket is received within the bearing bracket, and an intermediate bracket connects them. This nesting arrangement allows multiple adjustment functions (vertical, horizontal, inclination) to be integrated in a compact configuration that fits within the limited space above the drive unit while achieving the required 100-125mm vertical adjustment range.
Solution Approach 2:
The adjustment device is segmented into multiple functional brackets: a bearing bracket for mounting to the drive part, a mounting bracket for attaching the steering wheel, and an intermediate bracket connecting them. Each bracket has specific guides and grooves that enable independent adjustment movements, allowing the system to achieve comprehensive adjustment range through coordinated movement of segmented components.
2Device complexity
If a forced cam guide is used to simultaneously adjust the mounting flange in vertical direction, horizontal direction, and inclination, then the construction effort and installation space are minimized, but the device complexity increases
Solution Approach 1:
The forced cam guide mechanism merges three separate adjustment functions (vertical positioning, horizontal positioning, and inclination adjustment) into a single integrated system. The cam guide structure with its specific groove geometry causes all three adjustments to occur simultaneously when the mounting bracket moves vertically, reducing the number of independent control mechanisms needed while achieving full multi-directional adaptability.
Solution Approach 2:
The cam guide employs curved guide grooves with specific radii (R1 for mounting bracket, R2 for intermediate bracket) that geometrically constrain the movement path. This curvature design ensures that vertical movement of the mounting bracket automatically translates into coordinated horizontal and inclination adjustments, achieving complex multi-axis adjustment through elegantly simple curved geometry rather than multiple actuators.
3Length of moving object
If guide grooves with large radii are used to achieve the required adjustment ranges, then the vertical installation space requirement increases, but the adjustment range is sufficient
Solution Approach 1:
The adjustment device utilizes horizontal space within the bearing bracket to accommodate the guide grooves with large radii. By allowing the guide grooves to extend horizontally rather than purely vertically, the system achieves the required 100-125mm vertical adjustment range and 10-60mm horizontal adjustment range without proportionally increasing the vertical installation space, as the circular arc paths efficiently use three-dimensional space.
Data Source
Figure 1
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AI summary
The invention relates to a forklift truck (1) with a driver's workstation (7), in particular a driver's platform (8), for a standing operator (P) and a control element designed as a steering wheel (10), which is adjustably arranged on a drive unit (A) of the forklift truck (1) by means of an adjustment device (20). The adjustment device (20) comprises a mounting flange (25) to which the steering wheel (10) is attached and is designed as a positive cam guide (26) such that the mounting flange (25) is forcibly adjusted in the horizontal direction during a vertical adjustment and is forcibly adjusted in its inclination to the horizontal.The adjusting device (20) has a bearing bracket (30) which is attached to the drive part (A), a mounting bracket (31) which is provided with the mounting flange (25) and which is guided on the bearing bracket (30) by means of a guide (32), and an intermediate bracket (35) which is connected to the mounting bracket (31), in particular by means of a pivot connection, and which is guided on the bearing bracket (30) by means of a guide (33).