Window Fitting Pin Fastening System
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Solution Overview
Problem
Existing espagnolette fittings for windows and doors are difficult to attach efficiently due to screw-based fastening systems that require constant processing adjustments and can lead to tipping or visual impairment, and they often result in high assembly effort and potential heat loss.
Innovation Solution
A non-positively held pin is used for fastening, arranged transversely to the pocket opening, engaging behind the fitting part and held in the pocket walls, which supports the connecting rod fitting and prevents removal without disassembly, with options for sealing and easy disassembly through an undercut or dowel pin design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If screw-based fastening systems are used to attach fitting parts to window sashes, then the fitting parts can be securely fastened, but the assembly effort and processing time increase significantly
Solution Approach 1:
The patent replaces the screw-based mechanical fastening system with a pin-based system. The pin is inserted through the fitting part and engaged with recesses in the window sash, eliminating the need for threading operations and significantly reducing assembly effort while maintaining secure fastening.
Solution Approach 2:
The patent extracts the fastening function from the complex screw assembly process and isolates it into a simple pin insertion mechanism. The pin is designed with specific geometric features (such as expansion elements or engagement protrusions) that provide secure fastening without requiring the complex threading and fastening operations associated with screws.
2Reliability
If multiple fitting parts are distributed over different rebate surfaces, then the fitting can be securely attached, but the processing side of the sash changes constantly leading to high assembly effort
Solution Approach 1:
The pin-based fastening system provides a universal attachment method that works across all fitting parts regardless of their specific location or orientation on the sash. The pin design with engagement recesses creates a standardized interface that simplifies the assembly process while maintaining secure attachment for fitting parts distributed over different rebate surfaces.
3Reliability
If screw connections are used for attaching fitting parts, then the fitting can be fastened, but the fitting part may tip over in the window
Solution Approach 1:
The pin acts as an intermediary element that provides both fastening and stabilization functions. The pin is designed with engagement features (such as expansion elements or geometric constraints) that prevent the fitting part from tipping over while maintaining a secure fastening connection to the window sash.
4Reliability
If the pin is held non-positively in the pocket walls, then the fitting cannot be removed without disassembly, but the assembly process becomes simpler and more cost-effective
Solution Approach 1:
The pin is designed as a simple, inexpensive component that can be easily inserted and removed if necessary. The non-positive holding mechanism (such as friction fit, expansion elements, or geometric constraints) provides sufficient retention without requiring complex fastening operations, making the assembly process simple and cost-effective while preventing accidental removal during operation.
Data Source
Figure 1
Figure 2~4
Figure 5~6
AI summary
The fitting part (9) has a fastening unit for holding the fitting part in a slot on the window or door. The slot is opened towards a folding surface (5) arranged between a frame and a leaf (2) of the window or door. The fastening unit is a non-positively held pin (12,13).