Window Corner Bearing Link Assembly Anti-Rotation Mechanism
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Solution Overview
Problem
Existing connecting link arrangements for window or door corner bearings often fail to securely prevent unintentional rotation of the connecting link relative to the handlebar, leading to potential loosening and safety risks, especially in the operating position.
Innovation Solution
An anti-twist device comprising a spring-elastic locking lug and a locking recess on the handlebar, connected via a lever arm, which ensures the connecting link remains securely positioned within the undercut groove by preventing rotation and providing visual confirmation of proper engagement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the connecting link is designed to be rotatable relative to the handlebar to allow pivoting during operation, then the adaptability of the link arrangement is improved, but the reliability is worsened due to potential unintentional twisting and loosening
Solution Approach 1:
The link assembly incorporates a dynamic anti-rotation device that allows rotation during assembly and operation but automatically locks in the operating position to prevent unintentional twisting. The device transitions from a movable state during assembly to a locked state during operation, providing both adaptability and reliability.
Solution Approach 2:
The anti-rotation device automatically actuates when the link is inserted into the undercut groove, without requiring separate manual operation. The device self-locks upon reaching the operating position, ensuring reliability while maintaining ease of assembly.
2Reliability
If a spring-elastic locking lug with lever arm is added to prevent rotation, then the reliability is improved, but the device complexity increases
Solution Approach 1:
The anti-rotation function is integrated into the existing link assembly structure by combining the locking lug, spring element, and lever arm into a unified anti-rotation device that works together with the connecting link and handlebar, rather than adding completely separate components.
Solution Approach 2:
The spring-elastic locking lug automatically actuates through the movement of the link assembly itself, using the insertion motion into the undercut groove to trigger the locking mechanism, eliminating the need for separate actuation mechanisms or additional control systems.
3Reliability
If the locking elements are made wider than the undercut groove to prevent perpendicular insertion, then the reliability is improved, but the ease of operation is worsened due to difficulty in visual confirmation of engagement
Solution Approach 1:
The lever arm provides visual feedback through its position and orientation, allowing operators to easily confirm proper engagement of the locking elements with the undercut groove. The lever arm's definite position in the locked state serves as a clear visual indicator.
Solution Approach 2:
The lever arm serves as a mechanical feedback mechanism that provides immediate visual confirmation of the locking state. When the locking elements engage behind the undercut groove, the lever arm assumes a definite position that clearly indicates successful engagement to the operator.
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 twisting of the connecting link, reduces wear, and enhances holding forces, ensuring safety and ease of assembly while allowing tool-free pivoting and automatic actuation of the anti-twist device.
Implementation Method 1
the anti-twist device consists of a spring-elastic locking lug and a locking recess accommodating the spring-elastic locking lug on the handlebar
Implementation Method 2
the locking lug being connected to a lever arm by which the connecting link can be pivoted manually relative to the handlebar
Data Source
Figure 1~2
Figure 3~6
AI summary
A cam arrangement (4) for a corner bearing (3) intended for concealed arrangement or a pivot part of a sash (2) of a window, door or the like which can be pivoted against a frame (1), with a link arrangement for connecting the sash (2) to the frame (1), wherein a cam (7) is rotatably connected to at least one link (8) via an axle pin (16), which can be inserted from an open longitudinal side (6) into an undercut groove (5) arranged on the sash (2) or on the frame (1) and which has locking elements (9) which can be brought into a position engaging behind the undercut groove (5) by turning, wherein the cam is secured against turning on the link (8) by an anti-rotation device (10).