Man-carrying Vehicle Chassis with Stretching and Reducing Device
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Solution Overview
Problem
Conventional man-carrying vehicles, such as electric wheelchairs, cannot be easily folded or reduced in size, making them difficult to store, transport, and occupy significant space when not in use.
Innovation Solution
A chassis with a stretching and reducing device comprising stationary components, crank and connecting rod combinations, and a stretching and reducing assistant unit, allowing the vehicle to be converted between an in-use and a reduced not-in-use position, facilitated by an electric screw cylinder or air cylinder for easy storage and transport.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the chassis is made fixed and non-reducible, then the structural stability and load-bearing capacity are improved, but the ease of storage and transport deteriorates
Solution Approach 1:
The chassis is designed with a stretching and reducing device that allows it to dynamically change its length between a stretched state (for use) and a reduced state (for storage and transport). This dynamic transformation resolves the contradiction by providing structural stability when needed and ease of storage when not in use.
2Ease of operation
If the chassis is made reducible, then the ease of storage and transport is improved, but the structural stability and load-bearing capacity deteriorate
Solution Approach 1:
The chassis transitions from a static structure to a dynamic one with a stretching and reducing device. When stretched, the structure provides stability; when reduced, it enables easy storage and transport. The dynamic nature allows the system to adapt its structural properties based on operational needs.
3Ease of operation
If a stretching and reducing device is added, then the ease of storage and transport is improved, but the device complexity increases
Solution Approach 1:
The stretching and reducing device is segmented into multiple components including stationary components, crank and connecting rod combinations, and an assistant unit. This segmentation allows for manageable complexity while achieving the desired functionality of length transformation between stretched and reduced states.
Solution Approach 2:
The crank and connecting rod combinations act as intermediary mechanisms between the stationary components and the assistant unit. These intermediaries transform the motion and force from the assistant unit into the desired stretching and reducing motion of the chassis, managing the overall system complexity through functional decomposition.
4Device complexity
If manual operation is used, then the device complexity is reduced, but the productivity and speed of movement deteriorate
Solution Approach 1:
The assistant unit provides automated assistance in the stretching and reducing operation. Instead of requiring purely manual operation, the assistant unit actively participates in transforming the chassis length, thereby improving productivity and speed of movement while adding only moderate complexity compared to fully manual systems.
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 the vehicle to be conveniently stored, put away, and transported by allowing the chassis to be reduced in size, reducing space occupation and user effort, while preventing damage from improper force application.
Implementation Method 1
facilitated by an electric screw cylinder or air cylinder for easy storage and transport
Implementation Method 2
The stretching and reducing device includes first and second stationary components, first and second crank and connecting rod combinations
Data Source
AI summary
A man-carrying vehicle has a chassis, which can be reduced for the vehicle to be easy to store, put away and transport; the chassis includes a front part, a rear part, and a stretching and reducing device interposed between the front and the rear parts; the stretching and reducing device includes first and second stationary components, first and second crank and connecting rod combinations, and a stretching and reducing assistant unit; the first and the second stationary components are fixedly joined on the front and the rear parts respectively; the crank and connecting rod combinations are interposed between and pivoted to the stationary components; the stretching and reducing assistant unit is interposed between and pivoted on one of the stationary components and one of the crank and connecting rod combinations to provide power to change position of the front part in relation to the rear part of the chassis.