Snap Action Switch Contact Carrier Flash Trimming
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Solution Overview
Problem
Snap action switches experience unwanted arcing due to silver flash and overhangs from welding, leading to overheating and damage of internal components like the C-spring, which is difficult to manage with traditional welding methods.
Innovation Solution
Trimming the edges of the contact carrier to remove flash and overhangs after welding, increasing the distance between components and reducing the likelihood of arcing, and using a progressive die to shear off excess material during the manufacturing process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If traditional welding methods are used to attach contacts to contact carriers, then the contacts are securely attached, but silver flash and overhangs are created that cause unwanted arcing
Solution Approach 1:
The patent extracts and removes the harmful flash material created during welding through a trimming operation. A punch tool physically removes the flash from the contact carrier edge, eliminating the source of arcing while preserving the secure welded attachment of the contact to the carrier.
Solution Approach 2:
The patent discards the flash material that is created as a byproduct of the welding process. Rather than attempting to recover or reuse the flash, the invention focuses on removing it through trimming, as the flash represents harmful material that compromises switch reliability.
2Ease of manufacture
If flash is not removed from the contact carrier, then the manufacturing process is simpler, but internal components like the C-spring overheat and degrade
Solution Approach 1:
The patent implements a quick trimming operation that rapidly removes flash material in a single punch action. This skipping approach allows the harmful flash to be eliminated quickly without requiring complex multi-step processes, thereby maintaining ease of manufacture while protecting components from thermal damage.
Solution Approach 2:
The trimming operation is performed as a preliminary step before the switch is assembled and put into service. By removing the flash beforehand, the patent prevents the harmful thermal effects from occurring during operation, thereby protecting the C-spring and other internal components from overheating and degradation.
3Object-affected harmful factors
If the distance between components is increased to reduce arcing, then the switch housing size increases, but the likelihood of arcing decreases
Solution Approach 1:
By extracting and removing the flash material from the contact carrier edge, the patent eliminates the primary source of arcing without requiring increased spacing between components. This allows the switch to maintain a compact housing size while still achieving reliable arc prevention through the removal of the harmful flash element.
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 trimming process effectively reduces arcing, extending the electrical endurance of the switch, with tested units completing 25 k cycles without component degradation.
Implementation Method 1
using a progressive die to shear off excess material during the manufacturing process
Data Source
AI summary
Embodiments relate generally to systems and methods for preventing arcing within a snap action switch, particularly by removing a portion of a contact carrier attached to a stationary contact. A method of forming a contact for use in a snap action switch may comprise welding a contact onto a contact carrier; trimming at least one edge of the contact carrier proximate to the contact; and installing the contact carrier into a snap action switch housing. Trimming the at least one edge of the contact carrier may also comprise removing flash formed during the welding of the contact to the contact carrier.