Foldable Caster Linkage for Space-Saving Flatbed Trucks
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Solution Overview
Problem
Existing flatbed trucks lack flexibility in operation, as their caster units cannot be folded, leading to increased storage space requirements and transportation costs, and the push handles are limited in their usage angles.
Innovation Solution
A flatbed truck with a foldable caster unit, featuring a rotation driving device with an operating handle, connecting rod, front and rear linkage mechanisms, and reset devices, allowing the caster units to be easily folded and unfolded, enabling three operational modes: platform, pushing, and dragging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the caster unit is made fixed and non-foldable, then the structural stability is improved, but the storage space requirement increases and transportation cost increases
Solution Approach 1:
The caster unit is designed to be dynamically changeable between fixed and foldable states. The rotation driving device allows the caster unit to rotate between a working position (extended outward) and a storage position (folded inward against the load-bearing plate), enabling the structure to adapt its configuration based on operational needs versus storage requirements.
Solution Approach 2:
The caster unit is segmented from the main body through a rotation joint, allowing it to be independently positioned. The rotation driving device divides the caster unit into movable and fixed portions, enabling selective deployment of casting functionality while maintaining structural integrity during storage.
2Adaptability or versatility
If the push handle is opened to more than 90 degrees, then the operational flexibility is improved, but the synchronization with caster unit opening is compromised
Solution Approach 1:
The push handle operation is segmented from the caster unit rotation operation. The push handle can be rotated independently to various angles (including more than 90 degrees) without requiring synchronized movement of the caster unit. This independent control allows the user to first open the push handle to a comfortable angle, then separately deploy the caster units as needed.
Solution Approach 2:
The system transitions from a coupled motion mechanism to independent dynamic controls. The push handle rotation and caster unit deployment are decoupled, allowing each component to move independently according to operational requirements rather than being constrained by synchronized movement.
3Volume of stationary object
If the caster unit is made foldable and receivable, then the storage space is reduced and transportation cost decreases, but the operation complexity increases
Solution Approach 1:
The rotation driving device is designed to enable single-handed operation. The user holds the load-bearing plate with one hand and uses the other hand to rotate the operating handle, which automatically drives the linkage mechanisms to unfold or fold the caster units. The reset device automatically returns the caster units to the folded position when the operating handle is rotated back, eliminating the need for complex manual manipulation.
Solution Approach 2:
The operating handle serves as an intermediary control mechanism that simplifies the folding/unfolding operation. Instead of directly manipulating the caster units, the user rotates the operating handle, which through the linkage mechanisms (connecting rods, front and rear linkage mechanisms) automatically controls the complex motion of folding or unfolding the caster units.
4Productivity
If the caster unit is always in unfolded position, then the working efficiency is improved, but the portability and storage convenience deteriorate
Solution Approach 1:
The caster unit configuration is made dynamic rather than fixed. During working operations, the caster units are deployed outward to provide stable support and improve productivity. When transportation or storage is needed, the caster units are folded inward against the load-bearing plate, reducing the overall volume and improving portability. The rotation driving device enables quick transitions between these states.
Solution Approach 2:
The caster units are pre-positioned in a folded state during storage and transportation. Before working operations begin, the operating handle is rotated to automatically unfold the caster units to the working position, preparing the system in advance for efficient operation without requiring manual assembly or adjustment during the working process.
Data Source
AI summary
A flatbed truck with a foldable caster unit, comprising a load-bearing plate, a load-bearing support frame and a caster unit, and further comprising a caster unit rotation driving device. The caster unit rotation driving device comprises an operating handle, a connecting rod, a front linkage mechanism and a rear linkage mechanism, wherein the operating handle is pivotally connected with the load-bearing plate and is rotatable around a pivot axis of the operating handle. The operating handle is capable of linking with the front linkage mechanism and the rear linkage mechanism via the connecting rod to respectively drive the front caster unit and the rear caster unit to be rotated from the folded storage position to the unfolded rolling position, when the operating handle is rotated from a first position to a second position.