Window Corner Bearing Clamping Bracket Design
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Solution Overview
Problem
Existing corner bearings for windows and doors face issues with reliable attachment to frames due to corrosion from steel screws in aluminum profiles and thermal expansion differences, leading to potential loosening.
Innovation Solution
A corner bearing design featuring a clamping angle with rotatable clamping legs that securely attach to both horizontal and vertical C-shaped profile elements, using a pivot bearing and adjusting screws to ensure stable fixation without corrosion, allowing for secure attachment and adjustment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If steel screws are used to fasten the base plate to the aluminum frame, then the fastening strength is improved, but corrosion occurs due to galvanic contact between dissimilar metals
Solution Approach 1:
The patent introduces an intermediary clamping bracket made of aluminum that contacts both the aluminum frame and the steel base plate. This mediator prevents direct galvanic contact between dissimilar metals, eliminating corrosion while maintaining fastening strength through the aluminum bracket's clamping action on the frame and support of the base plate.
Solution Approach 2:
The patent extracts the fastening function from direct screw-fastening of the base plate to the frame and separates it into two independent functions: the clamping bracket clamps to the frame (providing structural attachment), and the clamping bracket supports the base plate (providing plate attachment). This separation eliminates the harmful galvanic contact while preserving both fastening functions.
2Strength
If steel screws are used to fasten the base plate to the aluminum frame, then the fastening strength is improved, but loosening occurs due to thermal expansion differences between materials
Solution Approach 1:
The aluminum clamping bracket serves as a thermal expansion mediator between the aluminum frame and steel base plate. Since the bracket is made of aluminum, it expands and contracts with the frame at the same rate, preventing differential thermal stresses that would cause loosening, while still maintaining secure fastening through its clamping mechanism.
Solution Approach 2:
The patent changes the material parameter of the fastening component from steel to aluminum, matching the thermal expansion coefficient of the frame. This parameter change ensures that both the frame and bracket expand/contract together with temperature changes, eliminating thermal stress-induced loosening while maintaining fastening strength.
3Device complexity
If point-based clamping plates or clamping blocks are used, then the device complexity is reduced, but the clamping area and reliability are insufficient for heavy sash weights
Solution Approach 1:
The patent segments the clamping function into two distinct components: a first clamping leg that contacts the frame and a second clamping leg that supports the base plate. This segmentation allows each leg to be optimized for its specific function while working together to provide reliable, large-area clamping capable of supporting heavy sash weights.
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 provides a reliable, corrosion-free, and thermally stable attachment of the base plate to the frame, ensuring secure support and preventing loosening, suitable for heavy sash weights and various environmental conditions.
Implementation Method 1
the first clamping leg of the clamping bracket is arranged on a rear side of the base plate facing away from the coupling device and is rotatably mounted about an axis of rotation between an insertion position and a clamping position
Implementation Method 2
the first clamping leg can be pulled towards the base plate in the direction of the rotation axis by means of an adjusting device in order to clamp the base plate to the frame
Data Source
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AI summary
The invention relates to a corner bearing for a window comprising: a base plate, which is designed to be fastened in a corner of a frame of the window, which corner is formed by converging C-shaped profile elements; and a coupling device, which is connected to the base plate and can be coupled to a sash of the window in order to movably mount said sash on the frame. A clamping bracket of the corner bearing comprises a first clamping leg extending in a first longitudinal direction, for fastening the base plate to a horizontal profile element of the frame, and a second clamping leg angled with respect to the first clamping leg and extending in a second longitudinal direction, for fastening the base plate to a vertical profile element of the frame. The first clamping leg is arranged on a back side of the base plate facing away from the coupling device and is mounted for rotation about an axis of rotation between an insertion position and a clamping position. In the insertion position, the first clamping leg can be inserted into a groove of the horizontal profile element. In the clamping position, the first clamping leg engages behind webs of the horizontal profile element. The first clamping leg can be pulled toward the base plate in the direction of the axis of rotation by means of an adjusting device in order to clampingly fasten the base plate while the first clamping leg is in the clamping position.