Collapsible Trolley Guardrail Structure for Strong Long-Load Support
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Solution Overview
Problem
Existing collapsible trolleys suffer from lack of high-strength support for objects longer than the trolley body, risk of children falling due to absent guardrails, large gaps and low strength at the bottom, and limited functionality such as pushing, pulling, caster insertion, and canopy shading.
Innovation Solution
A collapsible trolley with a guardrail design featuring a rack assembly, pull and push handle assemblies, caster assembly, and canopy assembly, including frames, guardrail tubes, and sliding sleeves for enhanced stability and functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the trolley uses fabric to surround the upper part of the rack, then the trolley can be folded and stored, but the fabric lacks high-strength support and can be easily crushed when carrying long objects
Solution Approach 1:
The frame is divided into multiple segments connected by joints, allowing the trolley to be folded while maintaining structural integrity. Each segment can move independently during folding, enabling compact storage without compromising the strength of the overall structure when deployed.
Solution Approach 2:
The trolley combines metal framing with fabric covering to create a composite structure. The metal frame provides the necessary strength and rigidity to support heavy loads, while the fabric covering provides flexibility for folding and a comfortable appearance. This composite approach resolves the contradiction between strength and foldability.
2Device complexity
If the trolley lacks guardrail protection, then the structure is simpler and lighter, but children are prone to falling out and safety is compromised
Solution Approach 1:
The guardrail structure serves multiple functions: it prevents children from falling out, provides structural reinforcement to the frame, and maintains the folded compact shape. By integrating the guardrail into the existing frame design, the patent achieves multi-functionality without significantly increasing complexity or weight.
3Ease of manufacture
If the bottom structure has large gaps, then the trolley is easier to manufacture and lighter, but the strength is low and riding comfort is poor
Solution Approach 1:
The bottom structure uses local quality enhancement by adding crossbars and reinforcing elements specifically at the bottom where strength is most needed. The rest of the frame maintains its simple open structure for ease of manufacture and light weight, while the bottom area receives localized reinforcement to improve both strength and riding comfort.
4Device complexity
If the trolley lacks multiple functional features, then the design is simpler and more affordable, but it cannot serve pushing, pulling, caster insertion, and canopy shading functions
Solution Approach 1:
The trolley is designed with multi-functional capabilities including pushing handles, pulling handles, caster wheel insertion, and canopy shading all integrated into a single frame structure. Each function shares components with other functions, such as the handle assemblies that can be used for both pushing and pulling, and the canopy structure that provides both shade and structural support. This approach achieves functional versatility without proportionally increasing complexity.
Data Source
AI summary
A collapsible trolley with a guardrail includes a rack assembly, a pull handle assembly provided in front of the rack assembly, a push handle assembly fixed behind the rack assembly, a caster assembly provided at a bottom of the rack assembly, and a canopy assembly provided above the rack assembly. The rack assembly includes a bottom rack, a front frame and a rear frame respectively provided at two ends of bottom rack, and side frames respectively provided at left and right sides of the bottom rack. The front frame is connected to the pull handle assembly, and the rear frame is connected to the push handle assembly. The collapsible trolley with the guardrail avoids the problems that the prior trolleys are prone to falling under load and have small holding strength. The collapsible trolley with the guardrail is simple and labor-saving to fold up, and provides a large usable volume.