Screw-Rivet Fastener for Ratchet Cover Plate Retention
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Solution Overview
Problem
Ratchet wrench cover plates are prone to loosening or falling out due to screws that are susceptible to coming loose, leading to debris exposure and potential damage to the ratchet head.
Innovation Solution
A combination screw and rivet fastener is used, where the fastener is inserted into a clearance hole and screwed into an opening in the cover plate until flush with the ratchet head, then the tip is deformed in a riveting operation to securely couple the cover plate to the ratchet head.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a screw is used to fasten the cover plate to the ratchet head, then the cover plate can be easily installed and removed, but the screw is susceptible to loosening or falling out
Solution Approach 1:
The patent combines two fastening mechanisms into a single integrated fastener: a screw portion with threads for engaging the cover plate opening, and a rivet portion at the tip for permanent attachment to the ratchet head. This merging allows the fastener to provide both easy installation (via screw threading) and reliable retention (via rivet deformation), resolving the contradiction between ease of operation and fastening reliability.
2Adaptability or versatility
If a screw is used to connect the cover plate, then the connection can be made and undone, but the screw may create debris and open the ratchet head
Solution Approach 1:
The integrated screw-rivet fastener eliminates loose screw components that could become debris. The rivet portion deforms to create a permanent, clean attachment that prevents the fastener from loosening or falling out, thereby eliminating the harmful effect of debris generation while maintaining the adaptability of the screw portion for initial installation.
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
This solution provides a secure and stable connection between the cover plate and ratchet head, preventing loosening and debris exposure, thereby enhancing the durability and reliability of the ratchet wrench.
Implementation Method 1
The tip of the fastener opposite the fastener head is then deformed in a riveting operation to more securely couple the cover plate to the ratchet head
Implementation Method 2
The fastener is then screwed into an opening in a cover plate until the fastener head is substantially flush against the ratchet head
Data Source
AI summary
Disclosed is a combination screw and rivet fastener that couples a cover plate to a ratchet head. The fastener is inserted into the ratchet head and then screwed into a hole of the cover plate. Thereafter, the tip of the fastener opposite the fastener head is deformed in a rivet operation.