Non-Matched Thread Corner Bearing for Tilt-and-Turn Windows
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Solution Overview
Problem
Existing corner bearings for tilt and turn windows/doors allow undesirable lateral adjustment of the pivot pin during tilting movements, leading to unwanted position changes, which conventional brake coatings fail to consistently prevent.
Innovation Solution
Designing internal and external threads that are not matched to each other, with differing pitches, flank angles, and diameters, to generate increased friction and prevent lateral displacement, along with a circumferential incision on the axle bolt for a bearing seat, ensuring the pivot pin remains stable during tilting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If matched internal and external threads are used, then the axle bolt can be adjusted easily, but the pivot pin twists the axle bolt during tilting movements causing unwanted lateral adjustment
Solution Approach 1:
The patent changes the parameters of the threads by making them non-matched, specifically with different pitches. This creates increased friction between the threads that prevents the pivot pin from twisting the axle bolt during tilting movements, while still allowing manual adjustment when needed
2Stability of the object's composition
If brake coatings are applied to the threads, then lateral adjustment is suppressed, but the brake coatings lose effectiveness after repeated adjustments
Solution Approach 1:
The patent replaces the consumable brake coating with a permanent structural solution - non-matched threads with different pitches. This eliminates the need for coatings that degrade over time, providing a durable, maintenance-free solution that maintains its anti-twist functionality throughout the product lifecycle
3Stability of the object's composition
If non-matched threads with different pitches are used, then lateral adjustment is prevented, but the required torque for turning the axle bolt increases
Solution Approach 1:
The patent carefully selects the pitch difference parameter to optimize the balance between preventing lateral adjustment and maintaining acceptable adjustment effort. The non-matched threads create sufficient friction to prevent twisting during tilting, while the pitch difference is controlled to allow manual adjustment with reasonable torque
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
This solution effectively prevents unwanted lateral adjustment of the pivot pin, ensuring smooth tilting and maintaining the window/door sash position by increasing the required torque for axle bolt rotation, thus eliminating undesirable position changes.
Implementation Method 1
the at least one internal thread and the external thread are not matched to one another in order to generate increased friction compared to internal and external threads which are matched to one another
Data Source
Figure 1A~3
Figure 4
AI summary
The invention relates to a corner bearing (10) for a tilt-and-turn window or a tilt-and-turn door with a fastening portion (12), two spaced-apart cheeks (18) which project next to one another away from the fastening portion, wherein at least one of the cheeks (18) has a through-hole (20), and a pivot pin (22) having at least one external thread (32) which extends between the cheeks (18) and is screwed to at least one internal thread (28). The corner bearing is characterised in that the at least one internal thread (28) and the external thread (32) are not adapted to one another, in order to generate increased friction in comparison to internal and external threads (28, 32) which are adapted to one another.