Polygonal Bearing Pin for Window Hinge Assembly
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Solution Overview
Problem
Existing window and door hinges face challenges in expensive production costs due to machining requirements for cylindrical bearing bolts and complex insertion processes, especially in restricted spaces.
Innovation Solution
A polygonal cross-section bearing bolt design allows for production by cutting and rolling a wire, reducing material usage and costs, with a conical section for alignment and indentations for secure fixation, enabling easier assembly and handling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a cylindrical bearing bolt with flattening is used, then the hinge provides stable operation, but the production cost increases due to machining requirements
Solution Approach 1:
The patent changes the cross-sectional geometry parameter from cylindrical to polygonal (triangle, square, rectangle). This parameter change eliminates the need for machining flattening operations while maintaining the rotation restriction function through the polygonal shape itself, thereby reducing production costs without compromising operational stability
Solution Approach 2:
The patent adopts a bearing bolt design that can be produced through simpler, cheaper processes such as rolling or extrusion of polygonal cross-sections, replacing the expensive machined cylindrical design. The polygonal wire can be directly formed without additional machining steps, making the component more cost-effective to manufacture
2Reliability
If a cylindrical bearing bolt with flattening is used, then the hinge provides stable operation, but the insertion process becomes complicated in restricted spaces
Solution Approach 1:
The patent changes the cross-sectional geometry from cylindrical to polygonal, which fundamentally alters the insertion characteristics. The polygonal cross-section with flat sides allows for easier alignment and insertion in restricted spaces compared to the complex flattening process required for cylindrical bolts, while still providing rotation restriction through the polygonal shape
3Ease of manufacture
If a polygonal cross-section bearing bolt is used, then production costs are reduced, but the alignment during assembly becomes more difficult
Solution Approach 1:
The patent employs asymmetric features on the polygonal bearing bolt, specifically the conical section with asymmetric orientation relative to the polygonal cross-section. This asymmetric conical section serves as a alignment guide that automatically orients the polygonal bolt correctly during insertion, eliminating alignment difficulties while maintaining the cost advantages of polygonal cross-section production
Solution Approach 2:
The conical section is provided in advance on the bearing bolt before assembly. This preliminary conical feature performs the alignment function during the insertion process, ensuring that the polygonal cross-section is properly oriented in the bearing block before the main body of the bolt is seated, thereby facilitating easy assembly despite the non-circular cross-section
Data Source
Figure 1~5
Figure 6~9
AI summary
The invention relates to a hinge for a window or a door in which a bearing block (22) is attached to the frame and a hinge sleeve (36) is attached to the wing, wherein the bearing block (22) and the hinge sleeve (36) are swivelably connected together by way of a bearing pin (1), wherein the bearing pin (1) is held rotationally fixed in at least one bearing boss (23, 24) of the bearing block (22), wherein the bearing pin (1) has a cross sectional shape that deviates from a circular shape and wherein a sleeve (37) made of elastic material can be placed in the hinge sleeve (36) in rotationally fixed fashion. In order to simplify the manufacture of a non-cylindrical bearing pin that can be attached rotationally-fixed relative to the bearing block, it is provided that the bearing pin (1) has a polygonal multi-edged cross section at least in the area of the length section associated with the hinge sleeve (36) and the bearing block (22).