U-Profile End Cap Self-Tapping Screw Longitudinal Play
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Solution Overview
Problem
Existing metal profile end caps for motor vehicle sliding tracks suffer from longitudinal play due to manufacturing tolerances, affecting aesthetic appearance and requiring costly adaptation operations during production.
Innovation Solution
An end fitting with a U-shaped cross-section and a self-tapping thread rod that screws into the profile's internal faces, ensuring secure longitudinal positioning without play and eliminating the need for adaptation operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional end pieces are used with tabs sliding along internal faces of side flanges, then the end piece can be attached to the rail, but longitudinal clearance persists due to tolerances degrading aesthetic appearance
Solution Approach 1:
The invention changes the attachment mechanism from a sliding tab system to a self-tapping screw system that creates threaded engagement. This parameter change in the fastening method eliminates longitudinal clearance by providing precise threaded positioning while maintaining attachment stability through screw fixation.
Solution Approach 2:
The invention extracts the problematic sliding tab mechanism and replaces it with a self-tapping screw fastening system. This removal of the inadequate attachment method and substitution with a superior screw-based solution resolves the longitudinal clearance issue while preserving secure attachment.
2Reliability
If adaptation operations such as punching cleats or drilling openings are performed on the profile, then secure attachment can be achieved, but production costs increase significantly
Solution Approach 1:
The self-tapping screw performs its own function of creating the threaded engagement directly in the aluminum profile without requiring pre-drilled holes or punched cleats. This self-service capability eliminates the need for additional adaptation operations, reducing production complexity while maintaining secure attachment.
Solution Approach 2:
The self-tapping screw performs the action of creating the threaded hole as part of the installation process itself, rather than requiring preliminary drilling or punching operations. This preliminary action integrated into the fastening step simplifies manufacturing while ensuring reliable attachment.
3Ease of operation
If the end piece design requires specific adaptation operations on the profile, then secure mounting can be achieved, but the mounting process becomes more complex and costly
Solution Approach 1:
The self-tapping screw automatically creates its own threaded engagement in the profile during installation, eliminating the need for pre-prepared holes or cleats. This self-service feature simplifies the mounting process and reduces operational complexity while ensuring secure attachment.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution provides a secure, play-free attachment of the end piece to the profile, enhancing aesthetic appeal and reducing production costs by simplifying the mounting process.
Implementation Method 1
a fixing member comprising a rod carrying a self-tapping thread and able to pass through a circular orifice made in said front wall in order to be screwed onto the internal faces of said wings of the U-shaped portion of the profile
Data Source
Figure 1~2
Figure 3~6
AI summary
The present invention relates to an end fitting for a profile (20) comprising at least one U-shaped cross-section portion including a base and two parallel wings (25) extending transversely from said base, said end fitting comprising a body (40) including a front wall (50) adapted to cover a front end surface of said U-shaped portion; said end fitting comprising a fastening member (60) including a rod carrying a self-tapping thread adapted to pass through a circular orifice provided in said front wall (50) to screw onto the inner faces of said wings (25) of the U-shaped portion of the profile (20), said fastening member (60) also including a head (62) having a diameter greater than that of said orifice and provided to butt against said front wall (50) at the end of screwing.