Detachable Handcart Frame and Brake Layout for Stable Stopping
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Solution Overview
Problem
Handcarts with multiple container types attached to a chassis unit face issues with insufficient rigidity and strength in the front-rear direction, leading to increased weight and unstable braking due to unbalanced braking forces between brake calipers.
Innovation Solution
The design includes a chassis unit with detachable container units that provide necessary strength and rigidity, and a brake cable configuration with pivoting members to balance braking forces between brake calipers, along with a mechanical brake that automatically stops the handcart when the user releases the grip.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the chassis frame is made heavier to ensure sufficient rigidity and strength in the front-rear direction, then the structural strength is improved, but the overall weight of the handcart increases
Solution Approach 1:
The container is divided into a container body and a container frame, where the container frame specifically provides front-rear directional support. This segmentation allows the container frame to bear the structural load, enabling the chassis frame to be lighter while maintaining overall strength.
Solution Approach 2:
The container frame extends in the front-rear direction to provide structural support, adding a dimensional element that specifically addresses the strength requirement in that direction without requiring the entire chassis frame to be heavy.
2Device complexity
If a single brake cable is used to operate both brake calipers simultaneously, then the brake system is simplified, but the braking force becomes unbalanced causing unstable handcart behavior
Solution Approach 1:
The brake cable system is segmented into a first cable for the first brake caliper and a second cable for the second brake caliper. This segmentation allows independent adjustment of each brake caliper's braking force, ensuring balanced braking performance while maintaining operational simplicity.
Solution Approach 2:
The braking force parameters for each brake caliper can be independently adjusted by changing cable tension or caliper positioning, allowing optimization of braking balance without increasing system complexity.
3Stability of the object's composition
If the container frame extends in the front-rear direction to provide structural support, then the rigidity is improved, but the device complexity increases
Solution Approach 1:
The container frame serves multiple functions: it provides structural support in the front-rear direction, supports the container body, and contributes to the overall rigidity of the handcart. This multi-functionality reduces the need for additional dedicated support structures, thereby limiting the increase in device complexity.
Data Source
AI summary
A handcart may include a chassis unit and a container unit configured to be detachably attached to the chassis unit. The chassis unit may include a front wheel unit rotatably supporting a front wheel; a rear wheel unit rotatably supporting a rear wheel; a chassis frame extending in a front-rear direction and supporting the front and rear wheel units; and a prime mover configured to rotate at least one of the front wheel and the rear wheel as a drive wheel. The container unit may be selected from a group including at least a first container unit and a second container unit. The first container unit may include a first container and a first container frame extending in the front-rear direction and supporting the first container. The second container unit may include a second container and a second container frame extending in the front-rear direction and supporting the second container.