Switching Device Rotary Handle Clamping Mechanism
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Solution Overview
Problem
In electrical installation switching devices, it is difficult for operators to distinguish between a trip-induced unlatched condition and a deliberate off condition, as the rotary handle can unintentionally reset to the off position, leading to potential contact welding issues and safety concerns.
Innovation Solution
A clamping device is integrated into the receiving pocket of the rotary handle, which securely holds the pin extension of the control pin in a release position, requiring significant effort to rotate the handle further into the off position, ensuring the handle remains in a triggered state until intentionally reset.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the rotary handle is automatically reset to the off position by spring force after triggering, then the switching mechanism can be reset for reuse, but the operator cannot distinguish between a trip-induced unlatched condition and a deliberate off condition
Solution Approach 1:
The patent introduces an intermediate position between the on and off positions that serves as a mediator to convey trip information. When the ratchet mechanism is triggered, the rotary handle is stopped at this intermediate position by the control pin engaging the clamping device, rather than automatically returning to the off position. This intermediate position acts as a visual indicator to the operator that a trip has occurred, while still allowing the handle to be manually reset to the off position when desired.
2Loss of information
If the rotary handle is held in an intermediate position by a locking shoulder, then the trip condition is indicated, but the rotary handle may slip over the locking shoulder unintentionally and reach the switched-off position
Solution Approach 1:
The patent employs a dynamic clamping mechanism where the clamping device can be actively engaged and disengaged. The control pin with its pin extension dynamically interacts with the clamping device - when the ratchet mechanism is triggered, the pin extension engages the clamping device to hold the handle in the intermediate position. To reset, the operator must deliberately rotate the handle to disengage the clamping device, providing controlled dynamics that prevent unintentional slipping while allowing intentional resetting.
3Reliability
If a clamping device is used to hold the pin extension in the release position, then accidental slipping into the off position is prevented, but the device complexity increases
Solution Approach 1:
The patent merges multiple functions into the clamping device to minimize overall complexity. The clamping device is integrated into the receiving pocket of the rotary handle and combines the functions of: (1) providing a mechanical stop for the pin extension, (2) preventing unintentional rotation past the intermediate position, and (3) allowing deliberate disengagement through controlled rotation. By combining these functions into a single integrated component rather than separate mechanisms, the patent achieves reliable intermediate position holding without excessive complexity.
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 solution prevents accidental slipping into the off position, providing a clear indication of a trip condition and ensuring the rotary handle remains in a safe, triggered position until manually reset, enhancing operator safety and preventing contact welding.
Implementation Method 1
in the switched-on position the force of a spring acts on the twist grip in the direction of the switched-off position
Data Source
Figure 1
Figure 2a~2c
Figure 3
AI summary
The device has a clamping device (48) detachably holding a pin extension (24). A mutual arrangement of a control tappet (26), rotary handle (28) and a pawl lever (32) is designed such that the pin extension is clamped by the clamping device during releasing the handle. The clamping device releases the pin extension in a deactivation position of the handle. The handle broadly presses the extension into a housing by a control chamfer (50) such that the lever engages with a locking zone (38) of a shaft in a locking position of the lever.