Riveting Screw Tack With Symmetrical Half-Clips for Boring Grid Alignment
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Solution Overview
Problem
Current riveting screw tacks are not accurate enough in size and positioning, leading to uncertainties in assembling structurally complex elements like aircraft structures, as they often have burrs, asymmetrical half-clips, and spacers with sharp edges, causing damage and requiring multiple operators for installation and removal, which increases labor costs and work time.
Innovation Solution
A riveting screw tack design featuring symmetrical half-clips and a flat-blade spacer forming a near-perfect circle for precise alignment, with a spherical or conical centering bearing and a cap for secure attachment, allowing single-sided access and blind installation, ensuring accurate positioning of boring grids.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional riveting screw tacks are used with stamped half-clips and cut spacers, then manufacturing is easier and simpler, but positioning precision and symmetry are insufficient leading to assembly uncertainties
Solution Approach 1:
The spacer is divided into two symmetrical half-clips that can be separately manufactured and then assembled. This segmentation allows each half-clip to be precisely formed with consistent geometry, improving overall positioning precision while maintaining manufacturing feasibility through modular construction
Solution Approach 2:
The invention introduces deliberate symmetry where the two half-clips are made identical and symmetrical relative to the rod axis. This symmetrical design eliminates positioning uncertainties caused by asymmetrical components, ensuring consistent alignment and repeatable assembly results
2Object-affected harmful factors
If burrs and sharp edges are present on half-clips and spacers, then manufacturing is simpler, but damage risk to assembled elements increases
Solution Approach 1:
The half-clips are pre-formed with rounded edges and smooth surfaces through precision forming processes before assembly. This preliminary action eliminates burrs and sharp edges that would otherwise require additional deburring operations, reducing damage risk while maintaining manufacturing efficiency
Solution Approach 2:
The invention converts the potentially harmful sharp edges and burrs into beneficial smooth, rounded surfaces through the forming process. The same manufacturing operations that create the half-clip geometry also naturally round the edges, transforming what would be harmful features into safe, damage-free surfaces
3Productivity
If multiple operators are used to install and remove tacks, then installation stability is improved, but labor costs and work time increase
Solution Approach 1:
The rod/half-clip assembly is designed to be axially mobile within the hollow body, allowing dynamic adjustment during installation. This mobility enables a single operator to easily manipulate the assembly into position and secure it, eliminating the need for multiple operators while maintaining installation stability
Solution Approach 2:
The tack design allows a single operator to perform both installation and removal operations independently. The self-contained structure with integrated half-clips and mobile rod assembly enables one person to complete the entire operation without requiring coordination with additional operators, improving productivity
4Manufacturing precision
If minimal clearance is provided between half-clip/spacer assembly and opening, then positioning precision is improved, but insertion difficulty increases
Solution Approach 1:
The half-clips and spacer are designed with curved, rounded surfaces that facilitate smooth insertion into the opening. The spherical or conical centering bearing provides gradual engagement, allowing the assembly to self-align and insert easily even with minimal clearance, maintaining both positioning accuracy and insertion ease
Data Source
AI summary
The invention relates to a riveting tack (50) to be introduced into coaxial openings of at least two elements to be assembled, and comprising a hollow cylindrical body (51), a rod (53) passing through the hollow body and partially provided with an external thread (52a), a nut (54) mounted on the threaded end (53a), two half-clips (56) fixed to the rod (53) and comprising hooking lips (57) on the ends thereof, and a spacer (58) arranged between the two half-clips (56), the rod/half-clip set being axially mobile along the spacer (58) between a first position wherein the hooking lips (57) are radially close, and a second position wherein the two half-clips (56) are retracted inside the hollow body (51) and radially distanced from each other. The invention is characterized in that the set formed by the half-clips (56) and the spacer (58) is, in the cross-section thereof, in the form of a near-perfect circle having a diameter identical to the inner diameter of the openings.