Window Fitting Gear Mechanism for Tilt-Turn Adaptability
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Solution Overview
Problem
Conventional window and door fittings with gear mechanisms are not suitable for tilt and turn solutions, especially in double-leaf timber-free designs, as they require a compact design and aesthetically appealing arrangements, but often restrict the direction of rotation and displacement, limiting their adaptability and compatibility with conventional locking systems.
Innovation Solution
A fitting with a gear mechanism featuring an input gear wheel rotatably mounted about a first axis of rotation in front of the faceplate, coupled to a step-up transmission gear wheel with a drive toothing and an output toothing of larger radius, allowing 360° or 180° adjustability and reversing the direction of rotation while maintaining a compact design by positioning the gear outside the rebate groove.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If the input gear wheel is arranged behind the faceplate in the rebate groove, then the gear mechanism is compact and easy to install, but the actuating element cannot be arranged symmetrically in the rebate clearance and the aesthetic appeal is reduced
Solution Approach 1:
The first axis of rotation is positioned in front of the main plane of the faceplate, extending the gear mechanism into the rebate clearance space between the up and down sashes. This dimensional relocation allows the actuating element to be arranged symmetrically in the middle of the rebate clearance, achieving aesthetic appeal without increasing overall complexity
Solution Approach 2:
The gear mechanism is divided into functional components: the input gear wheel with its first axis of rotation positioned in front of the faceplate for aesthetic arrangement, and the transmission gear wheel with its second axis of rotation behind the faceplate for compact integration. This segmentation allows each component to be optimized for its specific function and location
2Area of stationary object
If the input gear wheel is arranged in front of the faceplate, then the actuating element can be arranged symmetrically and space in the rebate groove is reduced, but the direction of displacement of the connecting rod is reversed compared to conventional fittings
Solution Approach 1:
The transmission gear wheel acts as an intermediary between the input gear wheel and the connecting rod. It receives rotational input from the input gear wheel and converts it into the appropriate directional displacement of the connecting rod, mediating the reversed direction to achieve compatibility with conventional locking systems while maintaining the space-saving front-mounted configuration
Solution Approach 2:
The transmission mechanism discards the reversed direction of displacement produced by the front-mounted input gear wheel and recovers the conventional displacement direction needed for compatibility with existing locking systems, thereby maintaining adaptability
3Volume of stationary object
If a transmission gear wheel with step-up gearing is used, then the input gear can have a smaller radius and the space requirement outside the rebate groove is reduced, but the device complexity increases
Solution Approach 1:
The transmission gear wheel employs step-up gearing with a larger radius than the input gear, changing the rotational parameters to achieve mechanical advantage. This allows the input gear to have a smaller radius, reducing the volume occupied outside the rebate groove, while the transmission mechanism itself remains a standard mechanical component
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
Enables a compact and aesthetically pleasing solution for double-leaf timber-free windows or doors, allowing for tilt and turn functionality with conventional locking systems, reducing space requirements within the rebate groove and ensuring the gear mechanism fits within the rebate clearance.
Implementation Method 1
The transmission gear wheel (36) is in driving connection with the input gear wheel (16) via the drive gearing (38) and with corresponding recesses (42) in the connecting rod (10) in a driving manner via the output gearing (40)
Data Source
Figure 1~3
Figure 4~5
Figure 6
AI summary
The fitting has a connecting rod (10), a guard rail (12) and a gearbox (14) with an input gear (16), where the gearbox is pivotally supported for switching the fitting around a rotational axis (18). The gearbox is rotatably coupled with an actuating element of the fitting. The gearbox has a gear wheel (36) with a drive gear (38) and an output gear (40). The gear wheel is rotatably supported around another rotational axis (34). An independent claim is also included for a window or door with a wing.