Electrical Switch Cam Assembly for High Voltage Stability
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In-line electrical switches suspended between high voltage electrical distribution lines tend to twist and move when opening and closing, making it difficult to maintain a stable electrical connection.
Innovation Solution
An electrical switch design featuring a first and second section connected by an insulator, with a pivotably connected contact arm and a spring-loaded cam assembly to assist in moving the contact arm between open and closed positions, reducing the effort required for operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the switch is suspended between two electrical conductor lines, then the switch does not need to be directly supported on a utility pole or tower, but the switch might twist and move when attempting to open and close the contact arm
Solution Approach 1:
The switch is divided into separate functional sections (contact arm assembly, cam assembly, insulator sections) that can be independently positioned and stabilized. The cam assembly acts as an independent stabilization mechanism that can be engaged to prevent twisting while allowing the suspension configuration to remain flexible for installation.
Solution Approach 2:
The cam assembly serves as an intermediary mechanism between the contact arm and the switch housing. It mediates the opening/closing motion while providing stabilization against twisting forces, allowing the switch to maintain both suspension flexibility and operational stability.
2Device complexity
If a traditional knife blade switch is used without a cam assembly, then the structure is simpler, but more force is required to open and close the contact arm
Solution Approach 1:
The cam assembly provides excessive mechanical advantage during the opening and closing motion. By using a cam profile that creates a mechanical lever effect, the system applies more force than strictly necessary to move the contact arm, reducing the input force required from the operator while the cam's geometric design manages the force distribution.
Solution Approach 2:
The traditional direct mechanical linkage is replaced with a cam-based mechanical system. The cam profile transforms the input motion into amplified output force, substituting a simple pivot connection with a cam-follower mechanism that provides mechanical advantage and reduces operating effort.
3Device complexity
If the contact arm is directly connected without a cam assembly, then the mechanism is simpler, but the electrical connection stability is reduced
Solution Approach 1:
The cam assembly is designed to preliminarily position and stabilize the contact arm before final contact is made. The cam profile ensures that the contact arm is properly aligned and held in the correct position during the approach to contact, preventing misalignment and ensuring stable electrical connection before the closing force is fully applied.
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 reduces the force needed to open and close the switch, ensuring stable electrical connections and minimizing movement-induced instability, allowing for efficient operation in overhead high voltage applications.
Implementation Method 1
a spring providing a biasing force against the frame member
Implementation Method 2
The cam assembly comprises a cam member slidably mounted to the second frame
Data Source
AI summary
An electrical switch including a first section; a second section; and a contact arm rotatably connected to the first section. An end of the contact arm is movable between an open position spaced from the second section and a closed position contacting the second section. The second section includes a cam assembly configured to assist in moving the end of the contact arm between the open and closed positions.