Earthing Switch Mechanism with Direct Control Lever Mounting
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Solution Overview
Problem
Existing three-position earthing switch mechanisms suffer from significant energy losses, high cost, large size, and operational inefficiencies due to non-ideal effort orientation and the need for additional components like intermediate pinions to maintain standard rotation directions.
Innovation Solution
The earthing switch tumbler is directly rotatably mounted on the axis of the control lever, eliminating the earthing switch carrier and using a single spring between the switch tumbler and earthing switch tumbler, with a transmission shaft integral to the control lever driving the knife-holder shaft, allowing direct action and reduced part count.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the conventional mechanism with earthing switch carrier and intermediate pinion is used, then the standard rotation direction (NF EN 60487) is maintained, but the device complexity increases and energy losses are significant
Solution Approach 1:
The patent removes the earthing switch carrier (4) and intermediate pinion (17) from the mechanism, eliminating unnecessary components that caused energy losses and complexity. The earthing switch tumbler (8) is directly mounted on the control lever axis, extracting the problematic intermediate elements while maintaining the required functionality.
Solution Approach 2:
The earthing switch tumbler (8) and control lever (2) are merged by mounting the tumbler directly on the control lever's axis of rotation. This consolidation eliminates the need for separate carriers and intermediate transmission elements, reducing complexity and energy losses while maintaining operational integrity.
2Ease of operation
If the conventional mechanism with intermediate pinion is added, then the standard rotation direction is respected, but the manufacturing cost increases
Solution Approach 1:
The intermediate pinion (17) is completely removed from the design. The patent achieves standard rotation direction compliance through the direct mounting configuration of the earthing switch tumbler on the control lever, eliminating the need for expensive intermediate transmission components.
3Ease of operation
If the conventional mechanism with connecting rod is used, then the knife-holder shaft is actuated, but the mechanism size becomes too large
Solution Approach 1:
The control lever (2) and knife-holder shaft are directly connected through the co-axial mounting of the earthing switch tumbler, eliminating the need for separate connecting rods. This direct coupling reduces the mechanism's volume while maintaining full actuation capability.
4Reliability
If the conventional mechanism with multiple parts is used, then the earthing switch can be actuated, but the assembly complexity increases and reliability decreases
Solution Approach 1:
Multiple separate components (control lever, earthing switch carrier, intermediate pinion, connecting rod) are merged into a integrated co-axial assembly where the earthing switch tumbler is directly mounted on the control lever. This reduces the number of parts, simplifies assembly, and improves reliability by eliminating potential failure points at connection interfaces.
Solution Approach 2:
The earthing switch carrier and intermediate pinion are extracted from the mechanism, removing components that contributed to assembly complexity and potential failure points, thereby improving overall reliability and mechanical endurance.
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 configuration reduces energy requirements, lowers costs, enhances mechanical endurance, and maintains compactness while respecting standard rotation directions without additional parts, ensuring accurate position indication and reduced assembly complexities.
Implementation Method 1
A single spring is interposed between the switch tumbler and the earthing switch tumbler
Implementation Method 2
the spring arranged between the earthing switch tumbler 8 and the switch tumbler 10 (not shown) relaxes and drives the earthing switch tumbler 8 in rotation
Data Source
Figure 1A~1B
Figure 2~3B
Figure 3A
AI summary
The mechanism has a switch tumbler (38) and an earthing switch tumbler (26) that are mounted pivoting between plates. A control lever (28) supports a connection axle (36) that penetrates in a gorge (45) of a switch driver (40). The tumbler (26) is mounted for rotating on a rotation axle (30) of a control lever (28) and directly drives the lever. A spring is placed between the tumblers (26, 38). A transmission axle (32) is integrated with the lever and is introduces in a hole of a knife-rest shaft (46) for driving the knife-rest shaft in rotation.