Retractable Bunk Shaft Design for Sleeper Cab Space Saving
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Solution Overview
Problem
The limited space within truck sleeper compartments necessitates the development of space-saving furnishings, as existing amenities and appliances are often reduced in size to optimize space, but there is a need for innovative solutions to further maximize this space.
Innovation Solution
A retractable bunk system utilizing a strong yet flexible material wound around a shaft, which can be extended and locked for use as a bed or shelf, and equipped with spring-loaded or motorized mechanisms for easy deployment and stowage, allowing for hidden storage when not in use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a bunk is permanently installed in the sleeper compartment, then sleeping functionality is provided, but space utilization is reduced when the bunk is not in use
Solution Approach 1:
The bunk is designed to be dynamically reconfigurable between deployed and retracted states. The material bunk can be wound around the shaft to retract into a compact form, or unwound to deploy as a functional bed, allowing the space to adapt between different usage modes throughout the day
Solution Approach 2:
The bunk material is nested around the shaft in a wound configuration when not in use, creating a compact stored state. This nesting approach allows the bunk to occupy minimal space when retracted, similar to how a nested doll contains smaller dolls within a compact form
2Strength
If the bunk material is made strong enough to support weight, then structural integrity is achieved, but flexibility for winding is reduced
Solution Approach 1:
The bunk utilizes composite material construction combining rigid support elements (such as wooden slats or reinforced framework) with flexible covering materials (such as fabric or vinyl). This composite structure provides both the necessary strength to support weight and the flexibility required for winding around the shaft
Solution Approach 2:
Different portions of the bunk structure have different material properties optimized for their specific functions. The support framework uses rigid materials for strength, while the surface covering uses flexible materials for winding capability, allowing each local region to have the quality needed for its purpose
3Ease of operation
If manual operation is used for deploying the bunk, then device complexity is reduced, but ease of operation is worsened
Solution Approach 1:
The spring-loaded mechanism provides self-service functionality by automatically winding the bunk material back onto the shaft when the latch is released. The stored elastic energy in the spring performs the retraction work, eliminating the need for manual cranking or complex motorized systems while maintaining ease of operation through simple latch engagement and release
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 retractable bunk system effectively optimizes space in truck sleeper compartments by providing a versatile and compact solution that can be easily deployed and hidden, enhancing the use of limited space while supporting the weight of an individual.
Implementation Method 1
the bunk can be equipped with a spring-loaded or other auto-retractable mechanism such that, when unlatched, the retractable bunk can be rewound and stowed with ease
Data Source
AI summary
A retractable bunk or bed is disclosed. The retractable bunk can be used in a sleeper compartment so as to optimize space within the cab. The innovation can include a shaft around which a suitably strong, yet flexible, material bunk can be wound. Thus, in a closed or “hidden” state, the material can be rolled up around the shaft and stowed, for example behind a door or within a compartment as desired. In an open position, the material is extended in a horizontal manner and affixed to retain the “bunk” position.