Threaded Insert Anchor for Stripped Door Frame Holes
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Solution Overview
Problem
Screw fasteners used to secure doors and frames often become loose over time due to stripped-out screw holes, leading to improper alignment and functionality issues, particularly in modern prefabricated construction methods where screw fasteners do not fully penetrate the frame, and in structures using softer wood products.
Innovation Solution
A repair system comprising a double open-ended hollow cylinder fastener anchor with a threaded exterior and interior center channel, along with a securing fastener, is used to enlarge and resecure stripped-out screw holes, allowing the original screw fastener to be reused and providing enhanced holding capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If screw fasteners are used to secure doors to frames in modern prefabricated construction, then construction time and cost are reduced, but the screw fasteners lack sufficient attachment interaction with the frame leading to loosening over time
Solution Approach 1:
The patent introduces a threaded insert as an intermediary component between the screw fastener and the door frame. The insert is installed in the pre-drilled hole and provides a reliable threaded engagement surface, allowing the screw to securely attach to the frame without requiring the screw to fully penetrate into the frame studs. This mediator resolves the contradiction by maintaining the short screw length needed for prefabricated construction while providing sufficient attachment interaction through the threaded insert interface.
2Ease of operation
If screw holes are stripped out due to repeated fastener insertion and removal, then the screw hole diameter increases, but the original screw fastener can no longer re-engage the hole with sufficient fastening capacity
Solution Approach 1:
The threaded insert serves as a mediator that replaces the damaged screw hole. When the original hole becomes stripped, the insert provides a new, intact threaded engagement surface. The insert's external threads engage with the surrounding wood material while its internal threads provide a fresh engagement surface for the screw fastener, restoring full fastening capacity without requiring re-drilling or adhesive procedures.
Solution Approach 2:
The patent changes the parameter of the engagement interface by introducing a metallic threaded insert with different material properties and thread geometry than the original wood screw hole. This parameter change allows the screw to engage with a more durable and precisely formed threaded surface, preventing future stripping and maintaining fastening capacity over multiple installation and removal cycles.
3Manufacturing precision
If adhesive and repair material are used to fill stripped screw holes, then the hole diameter is reduced, but the repair process requires extensive time for adhesive application and curing
Solution Approach 1:
The patent replaces the chemical adhesive system with a mechanical threaded insert system. Instead of applying adhesive and waiting for chemical curing, the insert is mechanically installed by threading it into the prepared hole. This mechanical installation method eliminates the time-consuming adhesive application and curing process while achieving the same goal of restoring the screw hole diameter and providing a secure engagement surface.
4Ease of manufacture
If screw fasteners do not fully penetrate the frame in prefabricated construction, then the frame can be fitted to the doorway, but the fasteners lack sufficient length to firmly secure the hinge to the frame
Solution Approach 1:
The threaded insert acts as a mediator that extends the effective attachment length. The insert is installed in the hole through the frame thickness, providing a threaded engagement surface that is accessible from the front face. This allows the screw fastener to engage the insert without needing to penetrate through the entire frame to the studs, maintaining the frame fitting capability while achieving sufficient hinge attachment strength through the insert-screw interface.
Data Source
AI summary
The invention could be a repair system and method for re-securing doors to their respective door frames when a screw fastener that originally used to secure the door to the respective door frame no longer engages and secures to the screw fastener's original screw hole in the door or frame, comprising a fastener anchor comprising a double open-ended hollow cylinder having a threaded exterior side and a hollow interior, the hollow interior forming a threaded lengthwise center channel that is continuously connected to the two open ends, one open end being tapered while the remaining other open end being shaped to receive a portion of a rotating instrument; a securing fastener having a threaded portion that can removably engage the threaded lengthwise center channel; wherein the threaded exterior side is capable of engaging and securing to the respective screw hole after the screw hole has been enlarged.