Industrial Truck Overhead Guard with Inward-Bent Struts
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Solution Overview
Problem
Industrial truck overhead guards face challenges in providing sufficient survival space while maintaining visibility and stability, especially for standing drivers, as large canopies and multiple struts can obstruct views and lead to strut buckling under loads.
Innovation Solution
The design features an overhead guard with a crown and at least two struts connected to the vehicle frame, where the struts have a desired inward bend creating an outwardly curved contour, allowing for controlled deformation under load, thus absorbing and dissipating the load uniformly without lateral shifting or buckling, and using a flat metal sheet to minimize visual obstruction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the overhead guard is made large to ensure sufficient survival space, then driver protection is improved, but the driver's view of the surroundings is obstructed
Solution Approach 1:
The overhead guard uses thin-walled struts with predetermined bends that can deform flexibly under load. This allows the structure to be lightweight and minimally obstructive while still providing sufficient protection through controlled deformation that absorbs impact energy.
Solution Approach 2:
The strut geometry is changed by introducing predetermined bends with specific radii and positions. These parameter changes allow the struts to deform in a controlled manner under load, absorbing energy while maintaining a compact overall structure that does not excessively block the driver's view.
2Stability of the object's composition
If numerous struts are used to support the overhead guard, then structural stability is improved, but the driver's view is restricted
Solution Approach 1:
Instead of uniformly thick struts, the invention uses struts with localized predetermined bends at specific positions. This concentrates the structural reinforcement where needed while keeping other portions of the struts thin and minimally obstructive to the driver's view.
Solution Approach 2:
The predetermined bends in the struts introduce curvature that allows controlled deformation under load. This curved geometry enables the struts to absorb impact energy through bending while maintaining overall structural stability with fewer, less obstructive support elements.
3Strength
If longer struts are used for standing drivers, then driver protection coverage is improved, but the risk of strut buckling increases
Solution Approach 1:
The struts are pre-formed with predetermined bends during manufacturing. This preliminary geometric configuration ensures that under vertical load, the struts will deform in a controlled outward direction at the bend location, preventing sudden buckling and maintaining stability even with longer strut lengths required for standing driver protection.
Solution Approach 2:
The inward-leaning geometry of the predetermined bends creates a pre-conditioned structural response that opposes buckling. When load is applied, the struts are predisposed to deform outward in a controlled manner rather than buckling inward, thus preventing instability.
4Stability of the object's composition
If the struts are made rigid to prevent deformation, then structural stability is improved, but the survival space is unduly restricted when deformation occurs
Solution Approach 1:
The overhead guard uses thin-walled struts designed to be flexible rather than rigid. These struts are intended to deform under impact load, absorbing energy through controlled bending at predetermined locations while maintaining overall structural stability and preserving driver survival space.
Solution Approach 2:
The wall thickness and geometric parameters of the struts are optimized to allow controlled deformation. The struts are designed with specific thickness ranges and bend radii that enable them to deform in a predictable manner under load, balancing stability with the ability to maintain survival space through controlled deformation.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design ensures effective load absorption and distribution, preventing strut buckling and maintaining operator space, while maintaining a clear view by using a flat metal sheet and controlled deformation of the struts, enhancing the overall stability and visibility of the driver's canopy.
Implementation Method 1
The strut first deforms at its predetermined bend. The applied load is converted into deformation work at the bend.
Implementation Method 2
Under load, the load is absorbed and transferred to the vehicle frame via the struts. The strut first deforms at its predetermined bend.
Data Source
Figure 1a~1b
Figure 2
AI summary
Industrial truck (10) with a driver protection roof (24) having a crown (28, 28') and at least two struts (26, 26') attached to a vehicle frame, which support the crown on opposite sides of the vehicle, wherein two or more of the at least two struts each have at least one predetermined bend (32) in which the respective strut is inclined inwards.