Connecting Rod Fitting Handle With Nested Pin Assembly
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Solution Overview
Problem
Existing handles for drive rods in sash windows require significant installation space and have complex assembly processes, limiting their compactness and ease of use.
Innovation Solution
A handle design featuring a rosette bushing with a recess transverse to the drive mandrel, allowing a pin to engage centrally, enabling a compact structure and easy assembly, with components like the rosette bushing, pin, and drive spindle pre-assembled as a unit, and incorporating features like a flange and anti-rotation web for stability and simplicity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a ring element is held axially immovably in the sleeve and fastened to the drive mandrel by means of a press-in pin, then the handle achieves reliable connection, but the ring element requires a large installation space in the wing
Solution Approach 1:
The pin is nested within the rosette bushing structure, with the pin's head received in a recess of the rosette bushing. This nesting arrangement allows the connection components to be compactly integrated, eliminating the need for a separate space-consuming ring element while maintaining reliable mechanical connection between the drive mandrel and the handle assembly.
Solution Approach 2:
The function of the ring element for securing the drive mandrel is merged into the rosette bushing structure. The rosette bushing itself, with its recess and flange design, combines the positioning, securing, and mounting functions that were previously distributed across multiple separate components, thereby reducing overall installation space.
2Reliability
If the drive pin is pressed into the plug-in handle, then the connection is secure, but the assembly process becomes complex and the plug-in handle cannot be separated from the drive pin
Solution Approach 1:
The handle assembly is segmented into separable components: the plug-in handle can be detached from the drive pin, and the drive pin can be removed from the rosette bushing. This segmentation is achieved through the recess design that accommodates the pin's head, allowing controlled separation while maintaining secure connection during operation. The components can be independently manufactured and assembled.
Solution Approach 2:
The connection between components transitions from a static pressed-fit arrangement to a dynamic, controllable connection. The recess and pin arrangement allows the handle to be inserted and secured during assembly, yet enables deliberate separation when needed for maintenance or replacement, providing operational flexibility without compromising connection security during use.
3Ease of operation
If the recess is designed as an opening extending over a portion of the circumference of the rosette bushing, then the pin is accessible from outside for easy assembly, but the recess may be exposed to contamination
Solution Approach 1:
The recess is designed with localized opening characteristics - open in specific angular portions to allow pin access during assembly, while maintaining enclosed or protected characteristics in other portions to prevent contamination during operation. This local differentiation of accessibility and protection qualities resolves the contradiction between ease of assembly and contamination prevention.
4Ease of manufacture
If the rosette bushing has a circumferential flange with large-diameter and small-diameter sections, then the attachment to the sash becomes simple, but the structure becomes more complex
Solution Approach 1:
The circumferential flange with varying diameters serves multiple functions: the large-diameter section provides a mounting surface that rests on the outside of the sash for secure attachment, while the small-diameter section allows insertion into the sash hole. This multi-functional design integrates mounting, positioning, and securing functions into a single structural feature, simplifying the overall attachment process despite the increased structural detail.
Data Source
Figure 1~2
Figure 3~5
AI summary
A handle (3) for driving a connecting rod fitting (2) has a rosette bushing (11) with a recess (17) arranged over a partial area of its circumference. A drive pin (5) connecting a plug-in handle (4) to the connecting rod fitting (2) is arranged within the rosette bushing (11). A pin (18) is guided through the recess (17) of the rosette bushing (11) and pressed into the drive pin (5). The handle (3) is particularly compact and easy to install.