Modular Transfer Switch Actuator with Pivot Arm Biasing
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Solution Overview
Problem
Existing electrical power transfer switches are costly, difficult to assemble, and not adaptable for lighter duty applications such as small businesses and homes, with designs like U.S. Pat. Nos. 6,538,223 and 8,735,754 facing challenges in assembly and requiring special tools due to high spring force and limited design flexibility.
Innovation Solution
The solution involves an actuator with a pivot arm and extension spring that biases the pivot arm towards the end positions of its travel arc, combined with a linear motor and modular design for transfer switches, allowing easy assembly and adaptation to various applications, and a contact assembly that uses compression springs and magnets to prevent 'blow open' conditions during contact engagement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high spring force is used to prevent blow open, then contact reliability is improved, but assembly difficulty increases and special tools are required
Solution Approach 1:
The pivot arm is pre-biased by the extension spring toward the end positions of its travel arc before contact engagement. This preliminary biasing action ensures that when contacts engage, they do so with sufficient force to prevent blow open, while the spring force is managed in a controlled manner that does not require special assembly tools
Solution Approach 2:
The extension spring acts as an intermediary element between the pivot arm and the frame, providing the necessary biasing force in a manageable way. The spring connects the pivot arm to the frame through a mechanical linkage that allows assembly with standard tools while still delivering sufficient contact force
2Force
If complex spring biasing mechanism is used, then contact engagement force is improved, but device complexity increases
Solution Approach 1:
The spring biasing function is segmented into distinct components: the extension spring provides the biasing force, the pivot arm transmits this force, and the radial extension with pivot connection allows controlled movement. This segmentation simplifies the overall mechanism while maintaining sufficient contact engagement force
Solution Approach 2:
Instead of using a complex compression spring mechanism that pushes contacts together, the invention uses an extension spring that pulls the pivot arm toward end positions, creating contact engagement force through a simpler, inverted approach
3Manufacturing precision
If fixed design is used, then manufacturing precision is improved, but adaptability decreases
Solution Approach 1:
The pivot arm is designed with the freedom to pivot through an arc and the ability to rock back and forth dynamically. This dynamic capability allows the same basic design to adapt to different applications and configurations while maintaining manufacturing precision through consistent geometric relationships
Solution Approach 2:
The actuator design with the pivot arm, extension spring, and radial extension creates a universal mechanism that can be applied to various transfer switch configurations. The modular nature of the design allows it to serve multiple functions across different applications without requiring complete redesign
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
This design reduces assembly complexity, lowers costs, and enhances adaptability for lighter duty applications while maintaining reliability and safety standards by providing a modular and efficient power transfer mechanism that prevents electrical contact separation.
Implementation Method 1
an extension spring has one end that is connected to the rotatable member and an opposite end that is connected to the pivot arm such that the extension spring biases the pivot arm toward the end positions of the travel arc of the pivot arm
Implementation Method 2
a contact assembly that uses compression springs and magnets to prevent 'blow open' conditions during contact engagement
Data Source
AI summary
A modular transfer switch (22) and actuator (20) wherein multiple transfer switches are connectable in linear arrangement with the actuator such that the actuator controls the position of all of the transfer switches. Each of the transfer switches (22) includes a contact assembly (48) that converts over-rotation of the drive linkage (26) in the transfer switch to added pressure between the load contacts and the power contacts in the contact assembly.