Insertion Tool Linear Drive Projection Alignment
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Solution Overview
Problem
Existing insertion tools for tang-free helical coil inserts face alignment issues due to radially sweeping hook paths, leading to uneven wear and compromised precision engagement, as the hook contacts the drive notch at different orientations and positions.
Innovation Solution
A rotatable mandrel with a drive projection and hook that travels in a linear motion, featuring a projection stop to limit travel and maintain perfect alignment with the drive notch, minimizing wear by ensuring consistent hook orientation and engagement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a radially sweeping hook path is used in the insertion tool, then the hook can engage the drive notch of the coil insert, but the hook changes longitudinal position and orientation during engagement, leading to misalignment and uneven wear
Solution Approach 1:
Instead of allowing the hook to sweep radially and change position, the invention inverts the approach by using a linearly translating drive projection that maintains constant alignment with the drive notch throughout engagement. The drive projection moves straight forward rather than sweeping, ensuring the hook remains perfectly aligned with the notch during the entire insertion process.
Solution Approach 2:
The invention changes the motion parameter of the driving mechanism from radial sweeping motion to linear translational motion. By modifying the path of motion from curved to straight, the alignment between the hook and drive notch is maintained constant, eliminating the misalignment issues caused by changing longitudinal position and orientation.
2Ease of operation
If the hook travels in a radially sweeping path, then engagement with the drive notch is achieved, but different orientations of contact occur, causing uneven wear of the hook over time
Solution Approach 1:
The invention inverts the engagement mechanism by replacing the radially sweeping hook with a linearly translating drive projection. This inversion ensures that the engagement surface maintains a constant orientation relative to the drive notch, preventing the uneven wear that occurs when the hook contacts the notch at varying orientations.
3Manufacturing precision
If a linear motion path is used for the drive projection, then perfect alignment with the drive notch is maintained, but additional constraint mechanisms are required to limit travel
Solution Approach 1:
The invention merges the alignment function and the travel limitation function into a single integrated drive projection structure. The linear motion path is inherently constrained by the geometry of the projection itself and its interaction with the tool housing, eliminating the need for separate constraint mechanisms while maintaining perfect alignment throughout the insertion process.
Data Source
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AI summary
An insertion tool is used to insert a threaded coil insert into a threaded opening of a support structure or workpiece. The tool includes a rotatable mandrel body having an axial longitudinal passage and a projection slot. A plunger is disposed in the passage forward of a spring which urges the plunger forward. The plunger in turn urges a drive projection. A front end of the plunger includes an inclined surface that slidingly and inclinedly engages an inclined surface of the drive projection. The urging of the drive projection by the plunger along their respective inclined surfaces causes relative sliding movement of the drive projection so that the drive projection translates linearly through the projection slot in a direction perpendicular to the longitudinal passage.