Three-Wheel Cargo Cart With Adjustable Handles And Automatic Brake
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Solution Overview
Problem
Existing wheelbarrows require operators to bear a significant portion of the payload weight while moving, lack stability when navigating single planks, and often lack an automatic parking brake feature, making them inefficient and difficult to maneuver.
Innovation Solution
A three-wheeled cart design with adjustable handle height and an automatic parking brake, achieved by adding two rear wheels with articulated handles that can be easily installed on standard wheelbarrows, reducing operator effort and improving stability, and allowing for independent control of handles for leveling on sloped surfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a standard wheelbarrow design is used, then the structure is simple, but the operator must bear about one-third of the payload weight while moving the unit
Solution Approach 1:
The invention segments the load-bearing function by adding two separate rear wheel assemblies to the traditional single front wheel design. Each rear wheel assembly independently supports portion of the payload, distributing the weight across three wheels rather than requiring the operator to bear one-third of the load. This segmentation of the support system reduces the force required by the operator while maintaining structural simplicity through modular addition of wheel assemblies.
2Device complexity
If a standard wheelbarrow design is used, then the structure is simple, but the unit lacks stability when navigating single planks
Solution Approach 1:
The invention transitions from a single-point contact (one front wheel) to a distributed contact system by adding two rear wheels. This dimensional change in the support configuration creates a stable triangular base when the rear wheels are positioned apart, providing lateral stability when navigating obstacles like single planks. The three-wheel configuration distributes the unit's weight across multiple contact points, preventing tipping and improving stability without significantly complicating the overall structure.
3Device complexity
If handle height is fixed in standard wheelbarrows, then the structure is simple, but it is not adaptable to various height users
Solution Approach 1:
The invention implements dynamic adjustability in the handle system by incorporating telescoping handle tubes with extension mechanisms. Instead of a fixed handle height, the handles can be extended or retracted to accommodate users of different heights. This dynamic feature allows the handle position to adapt to various operators while maintaining relatively simple construction through the use of telescoping tubes and basic locking mechanisms, resolving the contradiction between structural simplicity and adaptability.
4Reliability
If manual wheel clamping devices are used for anchoring, then the cart can be secured, but it requires manual release and is not automatic
Solution Approach 1:
The invention implements self-service anchoring through automatic wheel clamping mechanisms that engage the rear wheels when the cart is positioned on a slope or uneven terrain. The system automatically applies the parking brake function without requiring manual intervention, and can be released automatically when needed. This self-service capability provides reliable anchoring while eliminating the need for manual operation, resolving the contradiction between anchoring reliability and ease of automatic operation.
Data Source
AI summary
A hand propelled three wheeled cart for transporting miscellaneous cargo. The basic cart has a single front wheel with two solid rear supports, such as a standard wheelbarrow. The two rear wheels are attached to a lever that is pivotally connected to the lever mounting support brackets. Lifting the handles pries the two rear wheels, into position, elevating the rear cart support legs off the ground. This cam action reduces the operators lifting effort and improves the lateral stability of the cart. Releasing the handles automatically anchors the cart.