Pin Fastener With Coil Spring Groove
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Solution Overview
Problem
Existing pin fasteners for personal ornaments and similar small items have intricate structures that complicate manufacturing and assembly, leading to increased costs due to the need for intricately formed parts and complex configurations.
Innovation Solution
A pin fastener design featuring a cylindrical body with a coil spring on its periphery, where a groove or window is cut to accommodate the fastening portion, allowing for easy assembly and reduced manufacturing costs, with the coil spring providing a strong pressing force for pin retention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If intricate fastening members with bent forms are used, then pin fastening reliability is improved, but manufacturing difficulty and cost increase
Solution Approach 1:
The fastening mechanism is divided into separate functional components: a cylindrical body housing, a coil spring, and a pin insertion opening. This segmentation allows each component to be manufactured independently using simple processes, eliminating the need for complex bent fastening members while maintaining fastening reliability through the spring's elastic deformation.
Solution Approach 2:
The invention changes the material parameter from rigid intricately-formed fastening members to an elastically deformable coil spring. The spring's ability to deform and recover provides the necessary fastening force, achieving reliable pin retention through material property selection rather than complex geometry.
2Reliability
If multiple components such as guide cylinders, spherical bodies, and elastic bodies are assembled, then pin fastening function is improved, but assembly complexity and cost increase
Solution Approach 1:
The invention merges multiple functions into a single integrated structure: the cylindrical body serves as both the housing and the fastening member, while the coil spring provides both the clamping force and the release mechanism. This consolidation eliminates the need for separate guide cylinders, spherical bodies, and flange members, dramatically reducing assembly complexity.
Solution Approach 2:
The coil spring performs multiple functions simultaneously: it provides the clamping force to hold the pin, acts as the release mechanism when compressed, and serves as the elastic body that enables reversible fastening. This multi-functionality replaces several separate components with a single universal element.
3Strength
If intricately formed fastening members are manufactured, then pin retention strength is improved, but manufacturing cost increases
Solution Approach 1:
The invention achieves pin retention strength through the elastic parameters of the coil spring rather than through intricate geometric forms. The spring's wire diameter, coil density, and material properties are optimized to provide sufficient clamping force, allowing manufacturing via simple wire forming and coiling processes instead of expensive intricate shaping.
4Ease of manufacture
If simple structure with few parts is used, then manufacturing and assembly ease is improved, but pin fastening reliability may be compromised
Solution Approach 1:
The coil spring is pre-compressed during assembly to store elastic energy, creating a preliminary clamping force that automatically engages the pin upon insertion. This preliminary action ensures reliable fastening without requiring complex activation mechanisms, maintaining both simplicity and reliability.
Solution Approach 2:
The coil spring automatically adjusts its clamping force based on the pin's insertion and provides self-locking through its elastic properties. The spring's inherent ability to deform and recover creates a self-regulating fastening mechanism that ensures reliable pin retention without additional control components.
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 design simplifies manufacturing and assembly while ensuring reliable pin fastening and easy operation, with the coil spring's force preventing accidental release, thus reducing operational complexity and costs.
Implementation Method 1
an advancement and withdrawal of a fastening member with respect to a pin are carried out by utilizing a spring material having an elastic deformation function
Data Source
Figure 1(a)~1(b)
Figure 2(a)~2(d)
Figure 3(a)~3(b)
AI summary
A pin fastener is configured of a cylindrical body into which a pin is inserted, a coil spring wound on the outer periphery of the cylindrical body, and an outer cylindrical body surrounding the outer periphery of the cylindrical body and coil spring, wherein a cut is provided in the cylindrical body, and a linear fastening portion of the coil spring is fitted into the cut, thereby forming a pin fastening narrowed portion between the fastening portion and a wall portion of the cylindrical body opposed thereto. The pin fastener has a simple configuration formed of an extremely small number of parts which are easy to manufacture and assemble, and moreover, a superior working effect in a pinning device can be expected therefrom.