Door Fitting Arrangement Lever Kinematics Wear Reduction
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Solution Overview
Problem
Existing door and window fitting arrangements are complex and prone to errors due to a large number of elements and intricate kinematics, leading to high wear and susceptibility to mechanical failures.
Innovation Solution
A simplified fitting arrangement with a few key components, including a fastening element, main lever, and control lever, where the control lever drives the main lever through a secure mechanical coupling, reducing complexity and enhancing robustness, and incorporating a sliding section and protective elements to distribute loads and protect from external influences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a large number of elements and complex kinematics are used in fitting arrangements, then the fitting arrangement can achieve precise control and multiple functions, but the reliability decreases and wear increases
Solution Approach 1:
The patent extracts and eliminates unnecessary intermediate elements (levers, toothing mechanisms) from the traditional multi-element fitting arrangement. By directly coupling the control lever to the main lever through a simplified connection, the design removes components that caused wear and failure while preserving the essential control function of pivoting the sash.
Solution Approach 2:
The patent merges the control lever and main lever into a more integrated assembly where the control lever directly influences the main lever's movement. This consolidation reduces the number of independent components and their associated wear points, while maintaining the ability to control the sash positioning through the lever mechanism.
2Adaptability or versatility
If a large number of elements and complex kinematics are used in fitting arrangements, then the fitting arrangement can achieve precise control and multiple functions, but the wear increases
Solution Approach 1:
The patent removes the intermediate toothing mechanism and multiple levers that generated wear in traditional designs. By establishing a direct connection between the control lever and main lever, the design eliminates the wear points associated with gear teeth and multiple pivot connections, significantly reducing friction and wear.
3Adaptability or versatility
If a large number of elements are used in fitting arrangements, then the fitting arrangement can achieve precise control and multiple functions, but the device complexity increases
Solution Approach 1:
The patent extracts and eliminates unnecessary intermediate components such as multiple levers and toothing mechanisms. The simplified design uses only essential elements (control lever, main lever, fastening element) to achieve the same control function, dramatically reducing the number of components while maintaining operational capability.
4Reliability
If a simplified fitting arrangement with fewer components is used, then the reliability and robustness increase, but the control capability and functionality may be reduced
Solution Approach 1:
The control lever in the simplified design serves multiple functions: it pivots the main lever, controls the sash positioning, and provides the necessary mechanical advantage. This multi-functionality ensures that despite having fewer components, the system maintains full control capability over the sash operation.
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 solution reduces wear, increases reliability, and simplifies the kinematics, resulting in a more robust and efficient door or window operation with reduced maintenance needs.
Implementation Method 1
The main lever is designed to pivot about a main lever pivot axis that is fixed relative to the fastening element. The main lever is designed to bear at least part of the sash's weight (load transfer).
Implementation Method 2
The control lever is designed to pivot about a pivot axis that is fixed relative to the fastening element. The control lever is designed and/or intended to pivot the main lever.
Implementation Method 3
the drive section and the driven element can have corresponding engagement sections. Specifically, the drive section and the driven element can be designed as gear teeth or gear segments (engagement sections).
Data Source
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AI summary
The invention relates to a hardware arrangement (10) for a door or window assembly (12) with a frame (14) and a sash (16) pivotable relative to the frame (14), wherein the hardware arrangement comprises a fastening element (18), a main lever (20) pivotably mounted on or to the fastening element (18), and a control lever (24) pivotably mounted on or to the fastening element (18), wherein the main lever (20) is designed to pivot about a fixed main lever pivot axis (22), and wherein the control lever (24) is designed to pivot about a fixed control lever pivot axis (26) and is configured to pivot the main lever (20). The invention further relates to a door or window assembly (12) with such a hardware arrangement (10).