Fitting Part With Inclined Elongated Hole For Window Undercut
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Solution Overview
Problem
Existing fitting parts for windows and similar applications that utilize undercuts require expensive eccentrics for secure attachment, which increases manufacturing costs and complexity.
Innovation Solution
The design incorporates an inclined elongated hole for the tensioning element, allowing the holding element and base plate to be pretensioned without eccentrics, with adjustable spacers for non-displaceable or displaceable mounting and automatic twisting prevention, and features like chamfers, countersunk screws, and claws for enhanced stability and assembly simplicity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If expensive eccentrics are used for secure attachment in fitting grooves with undercuts, then reliability of attachment is improved, but manufacturing cost increases
Solution Approach 1:
The patent replaces expensive eccentrics with a simple clamping element that can be a basic screw or bolt guided through an elongated hole. This cheap fastening element achieves reliable attachment without requiring costly specialized components like eccentrics, directly resolving the contradiction between attachment reliability and manufacturing cost.
Solution Approach 2:
The invention extracts the essential function of the eccentric (rotational movement and clamping) and separates it into two independent components: the elongated hole providing the rotational path and the clamping element providing the fastening force. This extraction eliminates the need for complex eccentrics while maintaining attachment reliability.
2Reliability
If expensive eccentrics are used for secure attachment, then attachment reliability is improved, but device complexity increases
Solution Approach 1:
The patent segments the eccentric function into two separate simple components: the elongated hole in the base plate and the clamping element. This segmentation reduces device complexity by replacing a single complex eccentric component with two simple, easily manufactured parts that together achieve the same function.
Solution Approach 2:
The clamping element serves multiple functions: it provides fastening force, allows rotational movement through the elongated hole, and can be a simple screw or bolt that is universally available. This multi-functionality reduces device complexity by eliminating the need for specialized eccentric components.
3Ease of manufacture
If standard assembly methods are used without inclined elongated holes, then manufacturing simplicity is maintained, but assembly ease deteriorates due to lack of automatic alignment
Solution Approach 1:
The elongated hole is pre-formed with an inclined section that automatically guides the clamping element during assembly. This preliminary action of shaping the hole with the correct inclination ensures that the clamping element self-aligns and rotates the retaining element into the correct position, eliminating the need for complex alignment procedures.
Solution Approach 2:
The inclined elongated hole enables self-aligning assembly where the clamping element automatically finds its correct position and orientation as it is inserted and tightened. The geometry of the hole provides self-guidance, allowing assembly without specialized tools or complex alignment procedures, thus improving assembly ease while maintaining manufacturing simplicity.
Data Source
Figure 1~2
Figure 3~5
AI summary
A fitting part (2) of a drive rod fitting for a window, designed for installation in a fitting groove (4) having an undercut (24), has a retaining element (6) that is rotatable relative to a base plate (5). The retaining element (6) is connected to the base plate (5) by a bearing point (10) and a clamping element (11) located remotely from the bearing point (10). The clamping element (11) is supported on a section (29) inclined towards one end of an elongated hole (27). This causes the retaining element (6) to rotate when the clamping element (11) is tightened.