Sleeping Bag Footbox Venting for Heat Retention and Comfort
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Solution Overview
Problem
Current sleeping bags either prioritize heat retention and restrict motion or offer freedom of motion but lack thermal efficiency, making them unsuitable for a wide range of ambient temperatures, and there is no single design that balances ventilation and comfort across varying temperatures.
Innovation Solution
A sleeping bag with a selectively adjustable vent opening between the foot end, allowing for ventilation of the inner volume, which can be closed for warmth or opened for comfort and fresh air entry, combined with a shell design that conforms to the user's body for thermal efficiency and freedom of motion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the sleeping bag uses a mummy shape to minimize internal volume and conserve heat, then thermal efficiency is improved, but the user's range of motion and comfort are reduced
Solution Approach 1:
The sleeping bag incorporates a rectangular shape that maintains constant lateral dimensions throughout, providing consistent room for movement while allowing selective ventilation through the adjustable footbox opening. This dynamic adjustment capability enables users to optimize both thermal efficiency and range of motion based on environmental conditions.
2Ease of operation
If the sleeping bag uses a rectangular shape to provide good knee and foot room and freedom of motion, then ease of operation is improved, but thermal efficiency deteriorates due to larger internal volumes
Solution Approach 1:
The sleeping bag applies different functional characteristics to different regions: the upper body area maintains a contouring fit for thermal efficiency, while the footbox area provides extended room for movement. The adjustable opening in the footbox allows localized ventilation without compromising the thermal envelope of the upper body.
3Device complexity
If the sleeping bag uses a one-type-fits-all design, then device complexity is reduced, but adaptability to different temperature environments deteriorates
Solution Approach 1:
The sleeping bag incorporates an adjustable footbox opening that can be configured in multiple positions (fully closed, partially open, fully open) to adapt to different temperature conditions. This single dynamic feature enables one bag to perform the functions of multiple static designs, maintaining simplicity while achieving versatility.
4Loss of energy
If the sleeping bag minimizes internal volume to conserve heat, then thermal efficiency is improved, but air stagnation and discomfort increase
Solution Approach 1:
The sleeping bag design extracts excess heat and stagnant air from the internal environment by providing an adjustable ventilation opening in the footbox. This allows selective removal of harmful factors (stagnant air and excess heat) while maintaining the overall compact thermal envelope for heat retention.
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 sleeping bag provides thermal efficiency in cold temperatures while allowing for comfort and ventilation in milder conditions, offering a versatile solution for a wide range of ambient temperatures without the need for multiple bags.
Implementation Method 1
vent opening selectively adjustable between an open position and a closed position for venting the inner volume of a sleeping bag
Data Source
AI summary
A vented sleeping bag comprising an elongate shell defining an inner volume sized and shaped to receive a user therein. The shell has a head end, a foot end, left and right sides extending longitudinally of the shell, an overlying portion which overlies the user, and an underlying portion which underlies the user. The overlying portion of the shell has at least one vent. A closure is selectively movable between a closed position for closing the vent and an open position for creating a vent opening for ventilating the inner volume of the shell.