Pantograph Assembly for Double-Deep Pallet Reach
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Solution Overview
Problem
Standard forklifts are ill-suited for accessing the back row of double-deep stacked pallets, limiting their ability to efficiently handle and manage storage in densely packed warehouses and production facilities.
Innovation Solution
A pantograph assembly for fork lifts, featuring a mast carriage assembly, pantograph mechanism with pivotable and slidably coupled arms, and adjustable trunnion components, allowing for extended reach and improved operator visibility and maintenance access, enabling efficient handling of pallets in tight spaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If a standard forklift is used, then the structure is simple and easy to operate, but it cannot reach the back row of double-deep stacked pallets
Solution Approach 1:
The patent implements a nested pantograph mechanism where inner arms are positioned within outer arms, allowing compact storage when retracted and extended reach when deployed. This nested configuration enables the forklift to access back-row pallets while maintaining a compact profile that does not interfere with standard warehouse operations.
Solution Approach 2:
The pantograph mechanism is divided into multiple segments including outer arms, inner arms, and connecting linkages. This segmentation allows the reach mechanism to be broken down into manageable components that can pivot and extend independently, achieving extended reach capability while maintaining structural integrity and controllability.
2Adaptability or versatility
If a pantograph mechanism with multiple arms is used, then the reach capability is improved, but the mechanism complexity increases
Solution Approach 1:
The patent combines the outer arms and inner arms into a unified pantograph mechanism that operates through coordinated pivoting and sliding. This merging of components allows the system to handle various pallet configurations and reach depths while maintaining a cohesive structural design that reduces the number of independent control systems needed.
Solution Approach 2:
The pantograph mechanism employs dynamic elements including pivotable connections between arms and sliding couplings that allow the structure to adapt its configuration during extension and retraction. This dynamic design enables the mechanism to maintain structural integrity while achieving extended reach and accommodating different pallet sizes and stacking arrangements.
3Reliability
If hydraulic hoses are exposed, then the system is simple to manufacture, but maintenance needs increase and reliability decreases
Solution Approach 1:
The patent uses nylon shrink-wrapped hydraulic hoses that are encased in a protective flexible covering. This shrink-wrapped configuration protects the hydraulic hoses from damage and contamination while maintaining flexibility for movement during pantograph operation. The protective covering reduces maintenance needs and improves reliability without significantly complicating the assembly process.
Solution Approach 2:
The patent incorporates replaceable wear plates at critical contact points of the pantograph mechanism. These wear plates are designed to be easily replaced when worn, protecting more expensive components from damage. This approach reduces long-term maintenance costs and improves system reliability by preventing catastrophic failures.
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
The pantograph assembly enhances the ability to reach and manage double-deep stacked pallets, improving operational efficiency and productivity by allowing better access to all pallets, including those with low-profile openings, and reducing maintenance needs through the use of nylon shrink-wrapped hydraulic hoses and replaceable wear plates.
Implementation Method 1
a pantograph mechanism (140) for extending and retracting the fork carriage assembly (180) horizontally
Implementation Method 2
a mast carriage assembly (120) configured to be coupled to a mast of a lift vehicle for vertical movement along the mast
Data Source
AI summary
A pantograph assembly may include a mast carriage assembly comprising a trunnion cross-member and a trunnion shaft coupled to the trunnion cross-member, and a pantograph mechanism coupled to the trunnion shaft.