Width-Adjustable Fork Prongs for Pallet Jacks
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Solution Overview
Problem
Pallet jacks face challenges in handling variously sized pallets due to fixed prong spacing, requiring multiple units and increased operational time and costs, with existing solutions being too heavy, powerful, and expensive for pallet jacks.
Innovation Solution
A pallet jack with width-adjustable fork prongs utilizing a crank-operated chain drive mechanism with left- and right-handed threads on a threaded rod, allowing prongs to be adjusted by a single user to accommodate different pallet sizes without tipping, featuring a stop mechanism to prevent prongs from being set too close.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple pallet jacks with different prong spacings are used to handle variously sized pallets, then the ability to accommodate different pallet sizes is improved, but the capital expenditure and operational complexity increase
Solution Approach 1:
The pallet jack incorporates an adjustable prong spacing mechanism that allows the fork prongs to be dynamically repositioned between different spacing configurations. This enables a single pallet jack unit to adapt to various pallet sizes by adjusting the distance between prongs, eliminating the need for multiple specialized units.
Solution Approach 2:
The invention creates a universal pallet jack design where a single unit can perform multiple functions by accommodating different pallet dimensions through adjustable prong spacing. This multi-functional capability replaces the need for several specialized pallet jack units, reducing overall fleet complexity.
2Adaptability or versatility
If existing adjustment mechanisms are used on pallet jacks, then the prong spacing can be changed, but the mechanisms are too heavy, powerful, and expensive for pallet jack application
Solution Approach 1:
The invention extracts and isolates the essential adjustment function from heavy industrial mechanisms, creating a simplified version specifically suited for pallet jack applications. The mechanism uses lightweight components that achieve the same adaptability without the excessive weight and complexity of conventional solutions.
Solution Approach 2:
The adjustment mechanism employs inexpensive, easily replaceable components that are adequate for the application but would be considered too light for heavy industrial use. This approach prioritizes cost-effectiveness and simplicity over durability, accepting that the mechanism is optimized for the specific low-weight pallet jack environment.
3Adaptability or versatility
If existing adjustment mechanisms are used on pallet jacks, then the prong spacing can be changed, but they require extensive vertical space that is not available in pallet jack design
Solution Approach 1:
The invention transitions the adjustment mechanism from a vertical orientation to a horizontal one, allowing prong spacing to be modified through lateral movement rather than vertical displacement. This dimensional change enables the adjustment function to operate within the constrained vertical profile of the pallet jack while maintaining full adjustability.
4Productivity
If multiple pallet jacks with different configurations are maintained, then the ability to handle specific pallet sizes is optimized, but the time to locate and retrieve the correct unit increases
Solution Approach 1:
By implementing universal adjustability in every pallet jack unit, the system eliminates the need for workers to search for and retrieve specifically configured units. Any pallet jack can be quickly adjusted to accommodate the current pallet size, significantly reducing retrieval time and improving overall productivity.
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
Enables quick and easy adjustment of prong spacing to accommodate different pallet sizes, reducing the need for multiple pallet jacks and minimizing training requirements, ensuring stable operation with minimal capital expenditure.
Implementation Method 1
a threaded rod having left-handed threads on one side of a centerline and right-handed threads on the other side of the centerline
Implementation Method 2
a crank operated chain drive mechanism
Data Source
AI summary
A pallet jack includes a frame and a pair of outwardly projecting load prongs connected to the frame. The proximal ends of the prongs are connected to a horizontal member on the rear of the frame by brackets that keep the prongs out of the frame proper. A threaded rod is mounted horizontally on the horizontal member and is threaded into the proximal end of each prong, with the two ends of the threaded rod having opposite hand threads. The threaded rod is rotated by a user turning a crank mounted on top of the frame and connected to the adjustment threaded rod by a chain drive, allowing the width between the prongs to be adjusted inwardly or outwardly.