U-Shaped Spring Switch Device Pull-Out Resistance
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Solution Overview
Problem
Conventional switch devices for vehicle air-conditioner and audio equipment face difficulties in assembly due to increased fastening force requirements to prevent pull-out, making the assembly process complex and time-consuming.
Innovation Solution
A U-shaped spring member is placed on the outer periphery of the operating body, with arm portions extending into holes and engaging with a groove on the operating shaft, providing resilient contact and secure fastening while simplifying the assembly process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the fastening force of spring member 3 is increased to prevent pull-out of operating body 1, then resistance to pull-out is improved, but assembly becomes difficult and requires jigs
Solution Approach 1:
The spring member is divided into multiple arm portions (first arm portion, second arm portion, third arm portion, fourth arm portion) that can independently engage with the hollow cylindrical part and operating shaft. This segmentation allows each arm to provide fastening force while accommodating assembly variations, enabling reliable pull-out resistance without requiring high overall spring force that would complicate assembly.
Solution Approach 2:
The arm portions act as intermediary elements between the hollow cylindrical part and the operating shaft. They transmit fastening force while allowing for assembly tolerances and variations. The arm portions engage with both components, providing a mediator that ensures reliable connection without requiring excessive force during assembly.
2Reliability
If spring member 3 is made to yield strongly to fasten hollow cylindrical part 1A onto operating shaft 2A, then fastening reliability is improved, but assembly time increases
Solution Approach 1:
The spring member is divided into multiple arm portions that can yield independently during assembly. This segmentation allows gradual engagement and distribution of yielding action across multiple contact points, reducing the time required for assembly while ensuring reliable fastening through the cumulative effect of all arm portions.
Solution Approach 2:
The spring member is designed to dynamically yield during the assembly process, allowing the arm portions to flex and adapt to positioning variations. This dynamic behavior enables quick assembly without requiring precise pre-positioning or extended adjustment time, while still achieving reliable fastening once assembled.
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 solution enhances resistance to pull-out of the operating body while facilitating easy assembly, ensuring secure engagement and reliable operation of the switch device.
Implementation Method 1
U-shaped spring member 13 is placed on the outer periphery of hollow cylindrical part 11A... Arm portions 13B upwardly inwardly extending from both ends of spring member 13 are fitted into holes 11B through hollow cylindrical part 11A and brought into resilient contact with groove 12B on the outer periphery of operating shaft 12A
Data Source
AI summary
A U-shaped spring member is placed on the outer periphery of a hollow cylindrical part of an operating body. Engaging portions in arm portions upwardly inwardly extending from both ends of the spring member are fitted into holes through the hollow cylindrical part and brought into resilient contact with a groove on the outer periphery of an operating shaft. This structure provides a switch device that has great resistance to pull-out of the operating body for secure fastening thereof and is easy to assemble.