Rotary Control Unit With Flexible Mounting for Switchgear
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Solution Overview
Problem
Existing rotary control units for modular electric switchgear apparatuses can generate mechanical stresses that damage the equipment, as they are typically secured using clipping systems that exert forces on the insulating case.
Innovation Solution
The rotary control unit incorporates assembly means with flexible components and stops to distribute and absorb these stresses, featuring a reversible operating mechanism and securing slides with latches to securely attach to the insulating case without causing damage, utilizing flexible means and stops to limit relative movement and prevent nuisance tripping.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a clipping system with self-tightening grip is used to secure the control unit to the front panel, then the control unit is firmly attached, but mechanical stresses are exerted on the insulating case that can cause damage
Solution Approach 1:
The patent applies beforehand cushioning by introducing flexible means (elastic elements, springs, or rubber components) between the pressing parts and the insulating case surfaces. These cushioning elements absorb and distribute the mechanical stresses before they can reach the insulating case, preventing damage while maintaining secure attachment. The flexible means deform under load to provide stress relief, ensuring the control unit remains firmly attached without transmitting harmful forces to the case.
Solution Approach 2:
The patent employs flexible shells and thin films through the use of flexible means comprising elastic elements, springs, or rubber components. These flexible elements act as intermediate layers between the rigid pressing parts and the insulating case, allowing controlled deformation to absorb mechanical stresses. The flexible nature of these components enables them to conform to surface variations while distributing loads evenly, preventing stress concentration that could damage the insulating case.
2Ease of manufacture
If pressing parts directly contact the insulating case surfaces, then assembly is simple, but relative movement between control unit and equipment can occur under shocks and vibrations
Solution Approach 1:
The patent applies dynamics by incorporating flexible means that can dynamically adapt to external forces such as shocks and vibrations. The elastic elements, springs, or rubber components are designed to deform and recover, allowing the control unit to maintain stable contact with the insulating case under varying load conditions. This dynamic response prevents relative movement while accommodating thermal expansion, vibration, and shock without compromising assembly simplicity.
3Reliability
If stops are added to limit relative movement, then stability under shocks is improved, but device complexity increases
Solution Approach 1:
The patent applies merging by integrating the stops directly into the control unit housing or mounting structure, combining multiple functions into unified components. The stops are designed as built-in features rather than separate attachments, eliminating the need for additional fastening elements or complex assembly steps. This integration approach limits relative movement and provides stability under shocks while maintaining assembly simplicity and avoiding excessive device 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 design effectively reduces mechanical stress on the equipment, preventing damage and facilitating secure, correct assembly while allowing for translational and pivoting movements of the hand lever, ensuring reliable operation under shocks and vibrations.
Implementation Method 1
said at least a second pressing part being fitted on first flexible means of said control unit... said at least a first pressing part is fitted on second flexible means of said control unit
Data Source
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AI summary
A rotary control unit (1) designed to be associated with an electric switchgear apparatus (5) provided with an opening (11) arranged in a protuberant part (13) through which a rocking hand lever (15) extends, said control unit comprising rotary drive means (25) designed to be coupled with a rotary operating handle, a reversible operating mechanism to transform an angular movement of said drive means into a pivoting movement of said hand lever, and assembly means comprising at least a first pressing part (31) securedly united to said control unit and at least a second pressing part (32) designed to press respectively on a first and a second surface (21, 22) of said protuberant part parallel to said connection panels, said second pressing part being fitted on flexible means (41).