Door Window Drive Assembly Telescopic Rod Pivot-Hole Coupling
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Solution Overview
Problem
Existing solutions for drive assemblies in door and window frames require time-consuming cutting and drilling of transmission rods to adapt to varying frame dimensions, and previous attempts at avoiding these processes, such as telescopic rods, are not entirely satisfactory due to drawbacks like incomplete adaptation and potential interference.
Innovation Solution
A drive assembly featuring extruded or profiled transmission rods with a central portion and lateral portions that allow telescopic coupling with actuating members, where screws with a threaded tip create holes by shearing the rod material, providing a secure pivot-hole coupling instead of friction-based fastening.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If transmission rods are cut to measure and drilling holes are formed on them to adapt to different frame dimensions, then the drive assembly can be adapted to various frame sizes, but the installation process becomes highly time consuming
Solution Approach 1:
The transmission rod is divided into a first portion and a second portion that can slide relative to each other. The first portion includes a first groove and the second portion includes a second groove, allowing the rod to be segmented into adjustable sections that can be quickly positioned without cutting or drilling.
Solution Approach 2:
The transmission rod transitions from a fixed-length design to a dynamic, adjustable-length design where the first and second portions can slide along each other to different positions. This allows the rod to adapt to various frame dimensions while maintaining a single standardized component that requires no cutting or drilling during installation.
2Ease of manufacture
If pressure screws are used to fasten telescopic rods in selected positions, then cutting and drilling can be avoided, but the fastening reliability is insufficient due to friction-based connection
Solution Approach 1:
The friction-based fastening mechanism is replaced with a mechanical interlocking system. The protrusion on the first portion engages with the recess on the second portion, creating a positive mechanical connection that is independent of friction. This substitution provides reliable fastening while maintaining ease of assembly through the sliding mechanism.
Solution Approach 2:
The engagement interface uses curved surfaces - the protrusion and recess are designed with rounded geometries that allow smooth sliding during assembly and operation. The curved surfaces distribute contact forces evenly, enhancing both the reliability of the connection and the ease of assembly, while eliminating dependence on friction for maintaining the fastened position.
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
This solution enables quick and secure adaptation of transmission rods to actuating members without cutting or drilling, reducing installation time and eliminating deformation-related interference, ensuring smooth operation and secure fastening.
Implementation Method 1
screws with a threaded tip create holes by shearing the rod material, providing a secure pivot-hole coupling instead of friction-based fastening
Data Source
Figure 1
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Figure 4
AI summary
Drive assembly for door and window frames, comprising at least one actuating member (24, 25, 26, 27, 28) and at least one transmission rod (30, 32) fastened to the actuating member (24, 25, 26, 27, 28), The transmission rod (30, 32) comprises a central portion (34) and two lateral portions (36, 38) positioned at opposite sides relative to the central portion (34) and forming two channel-shaped longitudinal guides (58, 61), the central portion (34) having a longitudinal groove (48) positioned between the longitudinal guides (58, 61), the longitudinal groove (48) of the central portion (44) being closed by a base (44). The transmission member (24, 25, 26, 27, 28) has a connecting portion (72) including two longitudinal ribs (78, 80) with ends shaped in such a way as to establish a telescopic coupling with the longitudinal guides (58, 61) of the transmission rod (30, 32) and a central portion positioned between said ribs (78, 80) and provided with a threaded hole (104) in which is inserted a screw (106) having a tip (110) that is able to cut a hole in the base (44) of the transmission rod (30, 32) at said longitudinal groove (48).