Variable Diameter Cording for Cinch Sack Shoulder Comfort
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Cinch sacks with simple drawstring designs can be uncomfortable when carrying significant weight due to the drawstrings digging into the shoulders, and there is a need for an improved design that maintains comfort without increasing complexity.
Innovation Solution
A cinch sack with variable diameter cording, featuring a first length of cord for easy opening and closing and a second length with a larger diameter for shoulder comfort, which extends outside the channel guide to distribute weight more comfortably.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a simple drawstring design is used in cinch sacks, then manufacturing cost is reduced and device complexity is lowered, but comfort deteriorates when carrying significant weight due to drawstrings digging into the shoulders
Solution Approach 1:
The cord is designed with different diameters at different locations: a first length with a first diameter for passing through the channel and a second length with a second diameter greater than the first for providing comfort on the shoulders. This local variation in quality allows the same cord to serve multiple functions - easy manipulation through the channel and comfortable weight distribution on the shoulders - thereby resolving the contradiction between simple design and comfort.
2Ease of manufacture
If a uniform diameter cord is used throughout, then manufacturing is simpler and device complexity is reduced, but ease of operation deteriorates when closing the bag mouth due to difficulty in threading through the channel
Solution Approach 1:
The cord incorporates a first length with a smaller first diameter that can easily slide through the channel for opening and closing operations, while a second length with a larger second diameter provides comfort when worn. This local differentiation of dimensions resolves the contradiction by optimizing each section for its specific function.
Solution Approach 2:
The cord is segmented into distinct functional sections: a first length portion for channel passage and a second length portion for shoulder contact. This segmentation allows each segment to be optimized independently - the first segment for ease of manipulation through the channel and the second segment for comfort during wear, thereby resolving the contradiction between manufacturing simplicity and operational ease.
Data Source
AI summary
An apparatus for carrying objects includes a bag and at least one cord. The bag has a top portion and a bottom portion. The top portion of the bag includes an adjustable mouth and a channel. The cord includes a first end portion coupled to the bottom portion of the bag, a second end portion coupled to the bottom portion of the bag, and a middle portion positioned between the first end portion and the second end portion. The middle portion of the cord includes a first length of cord which extends slidably through the channel and a second length of cord which is positioned outside of the channel. The second length of cord has a substantially larger diameter than the first length of cord.