Expandable Fixing Device With Strike Stem
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Solution Overview
Problem
Conventional expandable screws require drilling an aperture in the wall and often result in drill head damage and damage to the screw during hammering, leading to inefficiencies and equipment failure.
Innovation Solution
An expandable fixing device comprising a first screw with a screwing orifice and expansion portions, and a second screw with a strike stem, where the second screw inserts into the first screw's orifice to expand the first screw's portions outwardly, allowing secure fixation without hammering, using an electric screwdriver.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a hammer is used to hammer the expandable screw into the aperture, then the screw can be installed, but the expandable screw is damaged
Solution Approach 1:
The patent introduces a dedicated installation tool as an intermediary between the hammer and the expandable screw. This tool has a receiving cavity that accommodates the expansion segment and a transmission cavity with a transmission groove that guides the strike stem. The tool mediates the impact force, transmitting it controlledly to expand the screw segments without direct hammer contact, thus preventing screw damage while achieving installation.
2Productivity
If the drill head of the electric drill is used repeatedly, then apertures can be drilled, but the drill head is broken
Solution Approach 1:
The installation tool is segmented into distinct functional cavities: a receiving cavity for the expansion segment and a transmission cavity for the strike stem. This segmentation allows each part to perform its specific function optimally - the receiving cavity protects the expansion segment during insertion, while the transmission cavity channels the striking force precisely, reducing overall tool stress and improving durability under repeated use.
3Reliability
If the expansion segment forces the bottom of the fitting sleeve to expand outwardly, then the fitting sleeve abuts against the aperture, but this requires precise matching of aperture diameter with screw dimensions
Solution Approach 1:
The patent employs a dynamic expansion mechanism where the expansion segment, initially compact, is forced outwardly by the strike stem during installation. This dynamic transformation allows the fitting sleeve to adapt to the aperture dimensions in real-time rather than requiring pre-matched static dimensions. The expansion portions can dynamically adjust to fit the aperture, reducing the need for precise dimensional matching while ensuring secure fixation.
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
Enables easy and secure screwing into pre-drilled apertures without damaging tools or screws, ensuring reliable and efficient installation and removal.
Implementation Method 1
the second extension of the second screw inserts into the screwing orifice via a top of the first screw and pushes the multiple expansion portions to expand outwardly
Implementation Method 2
the expansion segment of the threaded extension forces a bottom of the fitting sleeve to expend outwardly so that the fitting sleeve abuts against the aperture
Data Source
AI summary
An expandable fixing device contains: a first screw and a second screw. The first screw includes a first head portion and a first extension extending downwardly from the first head portion, the first extension has first threads formed on the first head portion, the first screw further includes a screwing orifice defined in the first head portion and multiple slots formed on the first extension, and the first extension has multiple expansion portions formed on a distal end thereof and intersecting with the multiple slots. The second screw includes a second head portion and a second extension extending downwardly from the second head portion, and the second extension has second threads formed on an outer wall thereof, wherein the second extension has a strike stem and inserting into the screwing orifice via the first screw and pushes the multiple expansion portions to expand outwardly.