Pretensioning Component for Window Sash Weight Compensation
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Solution Overview
Problem
The increased weight and complexity of modern windows and doors due to improved insulating properties and larger glass volumes lead to higher operating forces required to open sashes, which can result in overload on existing fitting components and instability in open positions.
Innovation Solution
A biasing member with a mechanically operated pretensioning device, utilizing a scissors arrangement with force-transmitting components to assist in opening and maintain the sash in an open position, reducing the operator's effort and ensuring stability without increasing closing forces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the frame and sash profiles are made deeper to improve insulating properties, then thermal insulation is improved, but the weight of the sash increases
Solution Approach 1:
The patent applies a biasing member that generates an opening force to counteract the increased weight of the sash. This counterweight mechanism compensates for the additional gravitational force acting on the heavier sash, allowing the improved thermal insulation design to be implemented without proportionally increasing the operating force required.
2Temperature
If the sash weight increases due to larger glass volume and deeper profiles, then insulating properties are improved, but the operating force required to open the sash increases
Solution Approach 1:
The biasing member acts as a counterweight mechanism that generates an opening force proportional to the sash weight, reducing the net operating force required from the user.
Solution Approach 2:
The biasing member is pre-loaded during the closing process to store energy, which is then released during opening to assist the user. This preliminary action of storing energy during closure provides assistance during the opening phase without requiring additional user effort during closure.
3Temperature
If the operating force increases due to heavier sash, then insulating properties are maintained, but the load on fitting components increases leading to possible overload
Solution Approach 1:
The biasing member reduces the peak operating force transmitted to the fitting components by providing a counteracting opening force, thereby preventing overload of the fitting components while maintaining the improved insulating design.
Solution Approach 2:
The biasing member acts as a cushioning element that absorbs and redistributes the forces acting on the fitting components. By providing a gradual opening force rather than requiring sudden high peak forces, the fitting components are protected from overload while supporting the heavier sash.
4Temperature
If deep profiles are used to improve insulation, then thermal performance is improved, but the sash tends to automatically fall back to closed position reducing stability in open position
Solution Approach 1:
The biasing member provides a continuous opening force that counteracts the closing tendency of the deep-profile sash. This creates a balanced system where the sash can be held stably in the open position without automatically falling back, while maintaining the improved thermal performance of the deep profiles.
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 significantly reduces the operator's effort needed to open the sash and maintains a stable open position by providing a supporting force, while minimizing additional structural changes and avoiding high resistance during closure.
Implementation Method 1
a biasing member (10) having a first force-transmitting component (15) contactable with a sash (2) of the window device (100) and/or door device; a second force-transmitting component (16) contactable with a frame (1) of the window device (100) and/or door device; and a mechanically operated biasing means (18) coupled to the first power transmission component (15) and the second power transmission component (16) and configured to generate a force
Implementation Method 2
The pretensioning device (18) has a spring element, in particular a torsion spring, a tension spring, a compression spring and/or a gas pressure spring
Implementation Method 3
The first arm (15) and the second arm (16) form a scissors arrangement, in particular with a common axis of rotation (14)
Data Source
Figure 1
Figure 2~4
Figure 5~6
AI summary
The biasing component has a power transmission component that is contacted with a wing (2) of a window device (100), and another power transmission component is connected with a frame (1). A mechanically powered biasing element is connected to the power transmission components to cause the force acting in the direction of an enlargement of the gap (2a) between wing and frame. An independent claim is included for a method for operating window or door device.