Window Door Fitting Automatic Length Adjustment
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Solution Overview
Problem
Existing window and door fittings have complex structures, high manufacturing costs, and require multiple lengths of square pins to accommodate different frame thicknesses, leading to logistical challenges and potential functionality issues.
Innovation Solution
A window or door fitting with a polygonal section that automatically adjusts in length to match the frame thickness, using a coupling arrangement with a first driver connected to the handle and a second driver that is rotationally fixed, allowing torque transmission while preventing unauthorized access.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a rigidly fixed length square pin is used to connect the handle to the mechanism, then the coupling between handle and mechanism is secure, but fittings for windows or doors with different frame thicknesses require different pin lengths, leading to complex logistics and assembly issues
Solution Approach 1:
The square pin is designed with longitudinal displacability within the coupling arrangement, allowing it to dynamically adjust its effective length. The pin can move axially between the handle and the mechanism connection, enabling the same pin to accommodate various frame thicknesses while maintaining secure coupling through spring-loaded engagement and positioning stops.
2Adaptability or versatility
If multiple square pins of different lengths are stocked to accommodate different frame thicknesses, then all window and door configurations can be served, but logistical effort and manufacturing costs increase significantly
Solution Approach 1:
A single universal square pin design is implemented that can serve multiple frame thickness configurations. The pin achieves this through longitudinal adjustability within the coupling arrangement, eliminating the need to stock multiple pin lengths. This universal design reduces logistical complexity while maintaining the ability to serve diverse window and door applications.
3Ease of manufacture
If the polygon section length is rigidly fixed, then manufacturing and assembly are simplified, but the fitting cannot automatically adapt to different frame or profile thicknesses
Solution Approach 1:
The square pin is designed to automatically adjust its position within the coupling arrangement based on the frame thickness. Through spring-loaded engagement and interaction with positioning stops, the pin self-regulates its effective length without requiring manual selection or adjustment, enabling automatic adaptation while maintaining manufacturing simplicity.
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 fitting simplifies assembly, reduces logistical needs by eliminating the requirement for multiple pin lengths, ensures precise operation, and enhances security by allowing only internal actuation of the window or door mechanism.
Implementation Method 1
The driving pin is loaded in the square hole of the handle neck with an axial pressure from a coil spring, which is arranged in the square hole.
Implementation Method 2
with a spring arranged between the polygon and the operating handle, which moves the polygon when attaching the window or door fitting positioned axially on the window or on the door
Data Source
Figure 1
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AI summary
A window or door fitting (1) for operating a mechanism integrated into the window or door has a stop body (4) that can be attached to the window or door, and a handle (6) that is axially fixed and rotatable on or in the stop body (4). A polygon (8) serves for the mechanical coupling of the fitting (1) to the mechanism integrated into the window or door, the polygon (8) projecting beyond the stop body (4) with a polygon section (8a). A coupling arrangement (10) formed between the handle (6) and the polygon (8) enables torque transmission from the handle (6) to the polygon (8), while the transmission from the polygon (8) to the handle (6) can be locked.-In order to automatically accommodate different frame or profile thicknesses when attaching to a window or door, it is provided that the length (L) of the polygonal section (8a) extending beyond the stop body (4) and insertable into the window or door frame is automatically adjustable when the stop body (4) is attached to the window or door, wherein the polygonal section (8) is guided longitudinally displaceably and rotationally fixed in the coupling arrangement (10) and extends through it into the handle (6).