Cage Nut Structure for Front Insertion Without Axial Play
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Solution Overview
Problem
Cage nuts exhibit play along the axis when tightened and can only be inserted from the rear with a tool, limiting their mounting flexibility and usability.
Innovation Solution
A cage nut design that allows partial insertion into non-round openings, such as rectangular or square openings, by rotating the cage and nut combination by less than 90 degrees, enabling the supporting portions to contact the thin wall, allowing for secure screwing without axial clearance and enabling mounting from the top or bottom.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the cage nut is inserted from the rear with a tool, then the nut can be tightened securely, but the mounting process becomes complex and time-consuming
Solution Approach 1:
The invention inverts the traditional mounting approach by enabling insertion from the front (open side) rather than from the rear. The cage nut is designed with a non-circular cross-section that allows it to be pushed through the opening from the front, eliminating the need for rear insertion and tool assistance while maintaining secure tightening capability
Solution Approach 2:
The cage nut incorporates self-aligning features through its non-circular cross-section geometry, which automatically orients the nut correctly as it is pushed through the opening. This self-service mechanism eliminates the need for external tools or complex alignment procedures, allowing workers to mount the fastener simply by pushing it through from the front
2Reliability
If the cage nut is designed for traditional insertion, then it can be securely mounted, but it creates axial play even when tightened
Solution Approach 1:
The invention employs asymmetric, non-circular cross-sections for both the cage nut and the opening. This asymmetry ensures that the nut can only be inserted in the correct orientation and creates inherent mechanical interference that eliminates axial play. The supporting portions of the cage engage with the wall surface in a way that prevents movement along the axis, providing stable, play-free mounting
Solution Approach 2:
The invention utilizes curved or rounded features in the non-circular cross-section design, where the supporting portions have rounded edges that contact the wall surface. This curvature distribution ensures uniform contact and eliminates gaps or play between the mounted component and the wall, while still allowing simple push-through installation
3Ease of manufacture
If the cage nut uses a circular cross-section, then it can be easily manufactured, but it cannot be inserted into non-round openings without tools
Solution Approach 1:
The invention adopts non-circular, asymmetric cross-sections (such as rectangular, square, or other polygonal shapes) for the cage nut. This design choice sacrifices minimal manufacturing complexity while dramatically improving adaptability, allowing the same basic manufacturing processes to produce nuts that fit various non-round opening types found in switch cabinets and automobile applications
Solution Approach 2:
The non-circular cross-section design creates a universal mounting solution that works with multiple types of openings (rectangular, square, or other non-circular shapes). This single design approach provides multi-functionality, enabling the cage nut to be installed in various locations and configurations without requiring different fastener types or specialized installation tools
Data Source
AI summary
A cage nut including a nut arranged in a cage. The cage has a base which has a round hole from which two opposing side parts ascend, each side part carrying a supporting portion facing outward. The cage and the nut have diametrically opposed projections which are shaped in such a way that, in a determined rotational position, when the nut is arranged in the cage it can be partially inserted axially into a non-round, preferably square opening in a thin wall, if necessary after compressing the side parts, whereupon the screw can be screwed into the nut.