Snap-Action Switch Terminal Layout for Easier PCB Mounting
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Solution Overview
Problem
Existing switch devices with snap action mechanisms face challenges in mounting contacts on a board due to difficulties in bending connection pins, which can interfere with the case, and require complex bending adjustments.
Innovation Solution
A switch device design featuring a movable terminal with a snap action mechanism, a first fixed terminal with sideward-bent connection pins, and a housing with groove portions that allow for easy planar mounting on a board, along with features like projecting walls and restriction walls to prevent foreign material entry and facilitate assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the connection pin is bent after the contact is coupled to the case, then the contact can be securely assembled, but the connection pin becomes difficult to bend and requires complex bending adjustments
Solution Approach 1:
The connection pin is bent in advance before the contact is coupled to the case. This preliminary bending action is performed when the contact is still separate from the case, making the bending operation much easier and more accurate. The bent connection pin then extends sideways to allow planar mounting on the board, while the groove portion in the case accommodates the bent pin during assembly, ensuring secure coupling without requiring complex bending adjustments afterward.
2Ease of manufacture
If the connection pin is bent in advance, then bending adjustments become easier to make, but the bent connection pin may interfere with the case
Solution Approach 1:
The groove portion is provided in the case to extract or accommodate the bent connection pin. By creating this dedicated space in the case structure, the bent connection pin can extend sideways without interfering with the case body. The groove portion specifically receives the bent pin, allowing the contact to be securely coupled to the case while maintaining the planar mounting capability of the bent connection pin.
3Ease of operation
If the connection pin is bent parallel to the mounting surface for planar mounting, then mounting on the board is facilitated, but the connection pin may interfere with the case structure
Solution Approach 1:
The groove portion in the case creates a dedicated passage that extracts or accommodates the bent connection pin. This allows the connection pin to be bent parallel to the mounting surface for easy planar mounting on the board, while the groove portion provides the necessary space to prevent interference with the case structure. The bent pin passes through or is received by the groove portion, enabling both planar mounting and secure case coupling.
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 enables easy and accurate bending of connection pins before assembly, prevents interference, allows for surface mounting, and enhances manufacturing efficiency while minimizing foreign material entry, thus improving the assembly process and reducing device size.
Implementation Method 1
a movable terminal including a snap action mechanism that bends a spring when a user moves an operating portion
Data Source
AI summary
A switch device includes a movable terminal including a snap action mechanism that bends a spring when a user moves an operating portion, a first fixed terminal that contacts the movable terminal when the spring is not bent, a second fixed terminal that contacts the movable terminal when the operating portion is moved by a specified amount to bend the spring, and a housing that accommodates at least the first fixed terminal. The first fixed terminal includes a first fixed terminal body that contacts the movable terminal, and a first fixed terminal connection pin bent sideward from the first fixed terminal body and mounted on a board. The housing includes a groove portion that allows for passage of the first fixed terminal connection pin.