Nested Axle Tube Hand Truck Assembly for Safer Load Tilting
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Solution Overview
Problem
Conventional hand trucks face difficulties in tilting heavy or bulky loads, stability over uneven surfaces, traversing obstacles, and ergonomic handling, with limitations in convertibility, weight, and manufacturing costs.
Innovation Solution
Improved toe plate support structures, modular design with replaceable parts, ergonomic handle orientations, and enhanced frame materials for increased strength and stability, along with convertible orientations and adjustable heights.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional hand truck design is used, then manufacturing cost is low and structure is simple, but user safety is poor and load control is difficult
Solution Approach 1:
The hand truck is divided into modular components including a frame assembly, wheel assembly, and load retention assembly. These can be independently manufactured, assembled, and replaced, improving safety while managing complexity through standardization.
Solution Approach 2:
Load retention features such as straps, chains, or mechanical retainers are pre-installed on the hand truck before use. This preliminary preparation ensures load control is immediately available, enhancing user safety without requiring complex operational procedures.
2Quantity of substance
If heavier loads are transported, then cargo capacity increases, but difficulty in tilting and maneuvering increases
Solution Approach 1:
The hand truck incorporates counterbalancing mechanisms such as strategically positioned frame geometry, adjustable handle heights, and pivot point optimization to offset the weight of heavy loads during tilting operations, reducing the effort required by the user.
Solution Approach 2:
The design allows operation in multiple orientations and configurations, enabling users to approach heavy loads from different angles and use leverage points that reduce tilting difficulty while maintaining full cargo capacity.
3Reliability
If load retention features are added, then load security improves, but device complexity increases
Solution Approach 1:
Load retention features are integrated into the existing frame structure rather than being separate add-ons. Straps, chains, or mechanical retainers are attached to built-in anchor points, combining the load security function with the structural framework to minimize additional complexity.
Solution Approach 2:
The frame structure serves multiple functions: it provides structural support, defines the load platform boundaries, and incorporates integrated anchor points for load retention. This multi-functionality achieves load security without proportionally increasing complexity.
Data Source
AI summary
Material handling devices are disclosed. Specifically disclosed is an improved hand truck wheel axle arrangement in which the axle supports are sized and formed to nest an axle tube that houses the axle. The wheel axle arrangement allows the axle to be easily moved and replaced while providing extra strength and stiffness to the axle. Also disclosed are the use of and placement of axle bushings.