Scissor Fitting One-Way Clutch Automatic Alignment
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Solution Overview
Problem
Existing scissor fitting arrangements for windows and doors require manual adjustment of the effective length, which can lead to misalignment and increased mechanical stress due to deformation over time, posing a safety risk and requiring professional intervention.
Innovation Solution
A scissor fitting arrangement with an automatic one-way clutch mechanism that adjusts the effective length when the sash is closed, ensuring correct alignment and reducing mechanical stress by allowing the sash to automatically realign with the frame.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the effective length of the scissor fitting is manually adjusted during assembly, then the initial alignment of the sash to the frame can be set, but the alignment cannot be automatically corrected if the sash warps or the fitting deforms over time, leading to increased mechanical stress and wear
Solution Approach 1:
The scissor fitting incorporates an automatic adjustment mechanism that uses the closing motion of the sash itself to trigger and execute the length adjustment. The sash's own movement during closing operates the adjustment mechanism through a cam or lever system, eliminating the need for external manual intervention and enabling self-correction of alignment issues
Solution Approach 2:
The adjustment mechanism is designed to activate periodically during each closing cycle of the sash. Through repeated closing motions, the mechanism gradually adjusts the effective length of the scissor fitting to compensate for warping or deformation, achieving continuous self-correction over time rather than requiring single manual adjustments
2Manufacturing precision
If the sash runs onto the frame due to incorrect effective length, then the sash can be forced into alignment, but this causes abrasion between the sash and frame and increased mechanical stress on the fitting arrangement
Solution Approach 1:
The automatic adjustment mechanism performs the alignment correction in advance, during the closing motion itself, before the sash can run onto the frame. By proactively adjusting the effective length to the correct value during closing, the mechanism prevents the harmful contact and subsequent wear that would otherwise occur
Solution Approach 2:
The mechanism incorporates a feedback loop where the position and alignment of the sash during closing are continuously monitored by mechanical elements such as cam followers or levers. This feedback information triggers the adjustment mechanism to modify the effective length, creating a closed-loop control system that automatically corrects alignment deviations without causing harmful contact
3Device complexity
If the scissor fitting effective length is fixed during assembly, then the structure is simple and stable, but it cannot adapt to deformations or warping that occur over time, requiring professional re-adjustment
Solution Approach 1:
The scissor fitting transitions from a static fixed-length structure to a dynamic adjustable structure. The effective length of the scissor arm can now vary automatically during operation through the integrated adjustment mechanism, allowing the fitting to adapt its geometry in response to alignment needs while maintaining structural stability during normal operation
Solution Approach 2:
The adjustment mechanism is merged directly into the scissor fitting structure itself, combining the support function and the adjustment function in a single integrated assembly. This eliminates the need for separate external adjustment devices and keeps the overall structure relatively simple despite adding automatic adjustment capability
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 automatic adjustment mechanism simplifies the installation and maintenance of scissor fittings, reduces wear and tear, and ensures precise fitting without the need for manual intervention, enhancing safety and longevity.
Implementation Method 1
the scissor arm (15) and the connecting component (27) are coupled to one another via a one-way clutch (33) forming a coupling element, in such a way that the scissor arm (15) can be displaced in the direction of the hinge bracket (31) relative to the connecting component (27), but is blocked against displacement in the opposite direction
Data Source
Figure 1A~1C
Figure 2A~2B
Figure 3A~3C
AI summary
A hardware assembly (11) for a window, door, or the like, with a scissor mechanism (13), comprises a scissor arm (15) and a scissor linkage (17) pivotally coupled to the scissor arm (15). Two parts of the support structure comprising the scissor mechanism (13) and the scissor bearing (31) can be variably fixed in different positions relative to each other in order to adjust the effective length of the scissor mechanism (13). The two parts are slidable relative to each other and are connected to each other via at least one one-way coupling (33), which forms an adjustable coupling element (33; 49; 51; 61). This coupling allows the parts to slide in one direction and blocks them in the other direction. The coupling is designed to automatically adjust itself when a sash of the window, door, or the like is closed, so that any misalignment of the sash is automatically corrected by shortening the effective length of the scissor mechanism (13).The one-way coupling (33) has a locking device (35) which includes a toothing (37) formed on one of the movable parts and a counter toothing (39) formed on the other part which interacts with it.