Retractable-Wheel Beach Wagon for Sand-to-Pavement Transport
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Solution Overview
Problem
Existing beach vehicles struggle to efficiently transition between hard and soft surfaces, with wheeled carts struggling on sand and sleds failing on pavement, and combined devices often underperform in both environments.
Innovation Solution
A portable beach vehicle with retractable wheels that can convert between a wagon configuration for hard surfaces and a sled configuration for soft surfaces, featuring a sled with a retractable wheel system that locks into position to ensure smooth operation on both types of terrain.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If wide wheels are used on a cart to help roll over sandy surface, then the cart can move on sand, but it requires significant energy and is difficult to pull through loaded sand
Solution Approach 1:
The patent applies dynamics by making the wheel configuration changeable - wheels can be deployed when needed for hard surfaces and retracted when transitioning to soft surfaces. This dynamic reconfiguration allows the vehicle to adapt its mobility characteristics to match the terrain, reducing energy consumption by eliminating unnecessary rolling resistance on sand where the sled body glides instead of rolling
Solution Approach 2:
The invention changes the physical parameter of wheel presence from fixed to variable. By retracting wheels completely above the sled bottom on soft surfaces, the contact mechanism changes from rolling (wheels) to sliding (sled body), fundamentally altering the energy requirements and mobility characteristics to suit different terrain types
2Ease of operation
If a sled-type vehicle is used to drag over sand, then it can transport items easily on sand, but it cannot be used on hard surfaces such as pavement
Solution Approach 1:
The patent achieves universality by combining sled and wheeled cart functionalities in a single vehicle. The sled body provides easy dragging on sand, while deployable wheels enable movement on hard surfaces. This multi-functional design allows one vehicle to perform both sled and cart operations effectively across different terrain types
3Object-generated harmful factors
If wheels are partially retracted above the sled bottom, then they clear the surface, but they may still interfere with sled functioning on soft surfaces
Solution Approach 1:
The patent applies the extraction principle by completely removing the wheels from the operational plane - retracting them entirely above the sled bottom rather than leaving them partially extended. This complete extraction ensures wheels cannot interfere with sled contact with the soft surface, allowing uninterrupted sliding motion while maintaining the option to deploy wheels for hard surface traversal
Data Source
AI summary
A portable beach vehicle having retractable wheels that allow the vehicle to convert between a wagon for use on hard surfaces and a sled for use on soft surfaces, such as sand, is provided. The vehicle has a container for holding items to be transported by the vehicle. The container is mounted on a sled that can be used to manually pull the vehicle over soft surfaces. Each of the wheels can be deployed to convert the vehicle from a sled to a wheeled wagon that can be manually pulled on hard surfaces. When used as a sled, each of the wheels can be retracted to a position in which each wheel is entirely above the sled so that the wheels do not interfere with motion of the vehicle as a sled.