Bonded Molded Bunk Structure for Lightweight Sleeper Cab Support
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Solution Overview
Problem
Current bunk systems for vehicles are uncomfortable, heavy, costly, and require multiple pieces with numerous fasteners, making them inefficient for compact storage and supporting dynamic and static loads.
Innovation Solution
A structural bunk system composed of two injection-molded shells bonded together, using adhesive or electromagnetic bonding, which are lighter, less expensive, and aesthetically pleasing, allowing for easy storage and support of occupant loads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If traditional metal structures with honeycomb or plywood are used, then structural strength is improved, but weight increases
Solution Approach 1:
The patent uses a composite structure consisting of an outer shell made from moldable material (such as polypropylene or other thermoplastics) and an inner core made from foam material (such as polyethylene or polyurethane foam). This composite construction provides the necessary structural strength while significantly reducing weight compared to traditional metal honeycomb structures. The foam core provides both structural support and cushioning, eliminating the need for heavy metal frameworks.
Solution Approach 2:
The outer shell is constructed from moldable material that can be formed into thin-walled yet structurally sound configurations. The shell incorporates ribs, gussets, and other geometric features that provide strength-to-weight optimization. This flexible molding approach allows creation of lightweight structures that maintain adequate strength for supporting occupants.
2Strength
If rigid sleeping surfaces are used, then structural support is improved, but comfort deteriorates
Solution Approach 1:
The combination of rigid outer shell and compliant foam core creates a structure that provides both support and comfort. The foam inner core acts as a cushioning layer that conforms to the occupant's body, while the rigid outer shell maintains structural integrity and load-bearing capacity. This composite approach eliminates the need for separate rigid surfaces and thick comfort cushions.
3Strength
If multiple pieces with numerous fasteners are used, then structural integrity is improved, but device complexity increases
Solution Approach 1:
The patent combines the outer shell and inner core into a single integrated bunk unit through molding operations. The outer shell is molded to receive and secure the inner core, creating a unified structure that functions as a complete bunk system. This merging eliminates the need for multiple separate components and numerous fasteners, significantly reducing assembly complexity while maintaining structural integrity.
Solution Approach 2:
The outer shell serves multiple functions simultaneously: it provides structural support, defines the bunk's external dimensions, incorporates mounting features for attachment to vehicle walls, and includes integrated storage compartments. This multi-functionality reduces the need for separate components and simplifies the overall system design.
4Ease of operation
If large cushions or mattresses are added, then comfort is improved, but storage space decreases
Solution Approach 1:
The foam inner core is molded to fit precisely within the outer shell, providing cushioning comfort without requiring additional space. The foam material is compressed during molding to achieve the desired density and firmness, allowing adequate comfort in a compact form factor that maximizes storage space in the vehicle.
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
The bunk system provides a comfortable, lightweight, and cost-effective solution with fewer components, improved aesthetics, and enhanced structural integrity for both sleeping and storage, suitable for various vehicle types.
Implementation Method 1
two injection-molded shells bonded together, using adhesive or electromagnetic bonding
Implementation Method 2
two injection-molded shells bonded together, using adhesive or electromagnetic bonding
Data Source
AI summary
A structural bunk system for a sleeper cab or other confined space is provided. The bunk system includes first and second shells that are made by injection molding and are then bonded together. The structural bunk system is secured to the wall of the sleeper cab or other confined space and is adapted to be moved between and upright stowed position and a lowered sleeping or storage position.