Variable Damping Element for Window Sash Tilt-Swivel Mechanisms
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Solution Overview
Problem
Existing window opening mechanisms, such as those described in DE 10 2011 087 695 B4 and DE 2009 049 952 A1, face issues with high operating forces and torsional loads when opening large, heavy wings due to the distance between the operating lever and the wing's upper edge, particularly in tilt-swivel operations.
Innovation Solution
A length-adjustable damping element, comprising a cable or band and a tension or compression spring, is positioned at a distance from its pivot bearing on the arm, providing an effective lever arm and reducing installation space, allowing for cost-effective production and efficient force reduction by acting on the arm during its deployment movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a damping element is positioned close to the pivot bearing to reduce installation space, then the lever arm is shortened and installation space is reduced, but the damping effectiveness decreases due to reduced torque
Solution Approach 1:
The patent employs a length-adjustable damping element that dynamically changes its effective length during operation. The damping element can extend to provide a longer lever arm when needed for effective damping, and retract or be positioned compactly when space is constrained. This dynamic adjustment allows the system to optimize between damping effectiveness and installation space requirements.
Solution Approach 2:
The damping element's lever arm length is made variable rather than fixed. By changing the effective length parameter of the damping element based on operational requirements, the system can achieve both compact installation and effective damping performance at different stages of operation.
2Ease of operation
If the damping element uses a complex mechanism to achieve length adjustment, then the damping effectiveness and space efficiency improve, but the device complexity increases
Solution Approach 1:
The damping element incorporates a telescopic or extendable structure that can dynamically adjust its length. This dynamic capability allows the damping element to provide optimal lever arm length for effective damping while maintaining a compact form when retracted, achieving both performance and simplicity goals.
Solution Approach 2:
The damping element uses a telescopic design where one component is nested within another, allowing the structure to compactly store its full extended length. This nesting approach enables the damping element to provide a long lever arm when needed while occupying minimal space during storage or retraction, without requiring complex external mechanisms.
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 effectively reduces the operating forces on the upper wing edge and minimizes loads associated with the opening movement, ensuring smoother operation and reduced torsional forces during both opening and closing, while maintaining a compact design.
Implementation Method 1
a tension spring (26) acting on the cable (29)
Implementation Method 2
length-adjustable damping element
Implementation Method 3
a compression spring (30) acting on the cable (29)
Data Source
Figure 1~2
Figure 3~5
Figure 6
AI summary
The invention relates to a device (6) for supporting and limiting a closing and/or opening movement of a sash (3) of a window or door (1), comprising an arm (20) hinged at one end to the sash (3) and at the other end to the frame (2), which is pivotable to the frame (2) and is associated with the sash (3) in a sliding guide (18), which can be coupled and uncoupled with the arm (20) by means of a coupling means (16, 19) movable by means of a drive rod fitting (4). In order to reduce the operating forces at the upper edge of the sash during a tilt-swivel opening and to reduce the loads resulting from the opening movement, it is provided that a length-variable damping element (26) acts on the arm (20) at a point of application (32) at a distance (33) from its pivot bearing (22) and the damping element (26) is associated with the arm (20) in a speed-changing manner during its opening movement.