Tilt Fitting Two-Armed Lever for Window Sealing Pressure
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Solution Overview
Problem
Existing tilt fittings for windows and doors face issues with inadequate contact pressure and lateral stability, leading to sealing problems and reduced service life due to high load on swivel joints and lack of mutual support among scissor elements.
Innovation Solution
A tilt fitting design featuring a two-armed lever with a support element, such as an eccentric screw, that applies even pressure to the frame, adjustable to optimize contact pressure and enhance lateral stability by supporting the scissor links and lever, and includes a sliding support with adjustable contact force for improved kinematics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stress or pressure
If preload is increased in the area of application of the tilt fitting to increase contact pressure, then contact pressure is improved, but the load on the swivel joints becomes so high that service life is reduced
Solution Approach 1:
The support function is divided between the scissor element and the two-armed lever with support element. The scissor element provides mechanical advantage while the two-armed lever with adjustable support element distributes the load and allows independent optimization of contact pressure without overloading swivel joints.
Solution Approach 2:
The support element is made adjustable to dynamically optimize the contact pressure. This allows the system to adapt the preload independently from the swivel joint loads, enabling high contact pressure for sealing while maintaining acceptable load levels on the swivel joints for durability.
2Ease of operation
If the tilt fitting is arranged in the upper area to provide pivoting function, then pivoting function is achieved, but contact pressure becomes increasingly smaller towards the area averted resulting in sealing problems
Solution Approach 1:
The two-armed lever introduces a new dimensional aspect to force application. By positioning the support element at a different location and using the lever arm, the system can generate contact pressure at the sash-frame interface even when the tilt fitting is positioned in the upper area for optimal pivoting.
Solution Approach 2:
The two-armed lever acts as an intermediary mechanism between the scissor element and the sash. It translates the mechanical advantage from the scissor element into distributed contact pressure at the sealing interface, resolving the conflict between pivoting performance and sealing pressure.
3Device complexity
If scissor elements lack mutual support, then device complexity is reduced, but lateral stability is insufficient and joints are loaded against their axes of movement causing considerable wear
Solution Approach 1:
The two-armed lever is integrated with the scissor element structure, combining their functions. The lever connects to both scissor links, creating mutual support that enhances lateral stability while maintaining relatively simple construction. This integration allows the joints to work primarily in their intended movement directions.
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 design achieves enhanced sealing through increased contact pressure, improved lateral stability, and extended service life by evenly pressing the sash against the frame and facilitating easier operation with improved kinematics.
Implementation Method 1
The two-armed lever, which is supported at one end outside the effective range of the scissor element against the closing direction of the sash, while the other end is articulated on the support strip and it is pivotably mounted on a pivot axis in both directions at the free end of the second scissor element. In the closed position, the sash is pressed evenly against the frame with a high pressure force, i.e. also in the area that has not previously been subjected to a pressure force.
Implementation Method 2
This support element can be designed as a correspondingly shaped support contour, as a roller or as a pin, but preferably as an eccentric screw, which is rotatably held in a support bearing, which in turn is firmly connected to the connecting rail.
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
The fitting has a connector rail (6) fastened at a stationary frame rail. A scissors element (1) with scissors members (2, 3) is attached to the connector rail. A supporting strip (4) is hinged at a free end of one of the scissors members for fastening a window leaf or door leaf. A double-armed lever (5) is swingably supported at a free end of another scissors member and articulated on the supporting strip, where the lever is displaceably held on the connector rail. The connector rail is provided with a supporting element e.g. roller, for supporting the double-armed lever.