Cargo Net Shank Rotation Restriction via Elliptical Cap
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional cargo net devices increase in size and weight due to the need for separate components to restrict shank rotation and prevent rattling, which is not user-friendly and inefficient.
Innovation Solution
A cargo net device with a hollow shaft and shank design where the first arm part has abutting parts that prevent tilting and rattling, and an elliptical cross-section with an insertion hole to restrict rotation without additional components, combined with an elastic member for biasing the shank, allowing easy assembly and reduced noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a separate insert element with groove is used to restrict shank rotation, then the rotation restriction function is achieved, but the number of components increases and the stay increases in size and weight
Solution Approach 1:
The patent combines the rotation restriction function with the cap component by forming a guide groove directly on the cap's inner peripheral surface. This integrates what would have been a separate insert element into the existing cap structure, reducing the number of components while maintaining the rotation restriction function. The guide groove is formed as an integral part of the cap, eliminating the need for a separate tubular insert element.
Solution Approach 2:
The cap is designed to serve multiple functions: it caps the hollow shaft, provides structural support, and restricts shank rotation through its guide groove. By making the cap multi-functional, the patent eliminates the need for separate components dedicated to each function, thereby reducing overall device complexity and component count.
2Ease of operation
If a separate insert element with groove is used to restrict shank rotation, then the rotation restriction function is achieved, but the stay increases in size and weight
Solution Approach 1:
The patent combines the rotation restriction function with the cap component by forming a guide groove directly on the cap's inner peripheral surface. This integrates what would have been a separate tubular insert element into the existing cap structure, reducing the number of components while maintaining the rotation restriction function. The guide groove is formed as an integral part of the cap, eliminating the need for a separate tubular insert element.
3Ease of operation
If the shank is allowed to rotate freely, then the ease of assembly is improved, but the shank tilts or rattles causing noise
Solution Approach 1:
The guide groove on the cap's inner peripheral surface automatically guides and restricts the shank's rotation during assembly and operation. This self-guiding mechanism eliminates the need for additional active components or complex adjustment mechanisms, allowing the structure to self-regulate the shank's position and prevent rattling noise without interfering with ease of assembly.
Data Source
Figure 1
Figure 2
Figure 3
AI summary
Provided is a cargo net device capable of preventing a shank from tilting or rattling as well as restricting the rotation of the shank without increasing the device size and the number of components or increasing the weight. A pair of parallel pins (324, 325) abutting against the inner peripheral surface of a hollow shaft (31) are provided to a first arm part (321) of a shank (32) at a predetermined spacing in the longitudinal direction. This prevents the shank (32) from tilting or rattling. Further, the insertion hole 33a of the retaining cap 33 and the cross section of the first arm part 321 each have an elliptical shape, and thus the rotation of the shank 32 with respect to the hollow shaft 31 is restricted and the position of the shank 32 is kept such that the interlocking part 323 points upward. It is not required to provide a member for restricting the rotation separately from the shank 32 and the retaining cap 33, which does not increase the device size, the number of components or increasing the weight.