Hand Truck Handle Positioning via Elastic Pull Rod and Slide Grooves
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Solution Overview
Problem
Existing handle positioning systems for hand trucks, such as those described in Taiwan patent M266209 and U.S. Pat. No. 6,938,905, are not optimally structured, lacking simplicity and efficiency in handle adjustment and requiring unnecessary components like stop bars, springs, and rings.
Innovation Solution
A handle positioning device featuring U-shaped pull rods with slide grooves and positioning holes, allowing for easy adjustment and stable positioning of the handle by leveraging the pull rod's resilience to move between recessed and positioning faces within the slide grooves.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a stop bar, spring and two rings are used for handle adjustment, then the handle positioning function is achieved, but the device complexity increases and ease of operation deteriorates
Solution Approach 1:
The patent removes the stop bar and spring components from the handle positioning system, retaining only the essential rings that fit into position holes. This extraction of unnecessary components directly reduces device complexity while preserving the core positioning function, allowing easier operation without the burden of complex mechanical assemblies.
Solution Approach 2:
The positioning system is segmented into discrete position holes along the lateral rod and corresponding rings on the handle. This segmentation allows the handle to be positioned at specific predetermined locations without requiring continuous adjustment mechanisms, simplifying both the device structure and the user interaction.
2Ease of manufacture
If a stop bar, spring and two rings are used for handle positioning, then the handle can be positioned, but the manufacturing cost increases due to unnecessary components
Solution Approach 1:
The patent eliminates the stop bar and spring components, reducing the total quantity of parts that need to be manufactured, inventoried, and assembled. This directly lowers manufacturing costs by removing unnecessary substances and simplifying the bill of materials, while the remaining rings and position holes provide sufficient positioning functionality.
3Ease of repair
If a complex positioning system with stop bar and spring is used, then handle positioning is achieved, but ease of repair deteriorates
Solution Approach 1:
By removing the stop bar and spring components, the patent eliminates potential failure points and simplifies the repair process. The remaining ring-and-hole positioning system has fewer moving parts and no elastic components that can degrade, making inspection and replacement straightforward tasks that improve ease of repair while reducing overall system complexity.
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 solution simplifies handle adjustment, reduces material and manufacturing costs, and provides a stable, easy-to-assemble and maintain handle positioning system, improving operational safety and convenience.
Implementation Method 1
leveraging the pull rod's resilience to move between recessed and positioning faces within the slide grooves
Data Source
AI summary
A handle positioning device for a hand truck includes a lateral rod, a pull rod, and a handle. The lateral rod has a slide groove respectively formed lengthwise in two end portions, and the pull rod has two bent ends fitting movably in the two slide grooves of the lateral rod. The handle has two side vertical rods, which fit respectively in the two ends of the lateral rod and provided with a plurality of position holes. When the handle is needed to be adjusted in its height, the pull rod is pushed to force the two ends to move inward to each other elastically in the two slide grooves of the lateral rod, and then the handle can be adjusted in its height by moved up or down, and then the pull rod is released to fit elastically in a new position hole in two side rods of the handle to keep immovable the handle at the newly adjusted height.