Screw with Adhesive-Bonded Torque Transmission Member
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Solution Overview
Problem
Conventional screws with recesses on the head can be easily loosened by unauthorized individuals, leading to aesthetic issues and difficulties in removal, and existing security screws mar the appearance and require manual tab removal.
Innovation Solution
A screw design featuring a male screw portion, a top hat portion with a flat end surface, and an adhesive solidification layer that bonds with a torque transmission means, allowing for secure fastening and easy removal by heat treatment, while preventing unauthorized loosening.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a recess such as a cross recess or slot is formed in the screw head, then the screw can be easily fastened and removed with a screwdriver, but the screw can be readily loosened by unauthorized individuals
Solution Approach 1:
The invention extracts the torque transmission function from the screw head recess and transfers it to a separate torque transmission member that is adhesively bonded to the screw head. This allows the screw head to have a smooth surface without functional recesses, preventing unauthorized loosening while maintaining ease of operation through the separate torque transmission member
Solution Approach 2:
The invention segments the screw into distinct functional parts: the screw head body, the torque transmission member, and the adhesive bonding layer. This segmentation allows each component to perform its specific function independently - the screw head provides fastening, the torque transmission member enables controlled removal, and the adhesive maintains security against unauthorized loosening
2Reliability
If a specially shaped recess is formed in the screw head to prevent loosening, then unauthorized loosening is prevented, but the aesthetic appearance of the screw is marred
Solution Approach 1:
The invention extracts the torque transmission recess from the visible screw head surface and relocates it to a separate torque transmission member. This allows the screw head to maintain a smooth, aesthetically pleasing surface while the torque transmission function is preserved in the attached member that can be removed after installation
3Reliability
If a tab is formed on the screw head to prevent loosening, then the screw cannot be separated by hand, but the tab removal operation must be performed manually one by one with a tool
Solution Approach 1:
The invention replaces the mechanical tab structure with an adhesive bonding system. The torque transmission member is bonded to the screw head using adhesive that provides strong holding force preventing unauthorized loosening, but can be easily removed by applying heat to melt or soften the adhesive, eliminating the need for manual tool-based removal operations
4Reliability
If a tab is formed on the screw head to prevent loosening, then unauthorized loosening is prevented, but traces of removal remain on the screw head after tab removal
Solution Approach 1:
The invention replaces the mechanical tab with an adhesive-bonded torque transmission member. When removal is needed, heat is applied to the adhesive layer causing it to melt or soften, allowing the torque transmission member to be cleanly separated from the screw head without leaving any traces or marks on the screw head surface, maintaining aesthetic appearance
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 screw provides a secure fastening solution that is aesthetically pleasing and easy to handle, with the adhesive layer removable by heat treatment, effectively preventing unauthorized loosening and allowing for easy recycling of components.
Implementation Method 1
an adhesive solidification layer that bonds the top end surface of the top hat portion and the base end surface of the torque transmission means to mechanically couple them
Implementation Method 2
the adhesive has a property of being removed from the top end surface of the top hat portion when a predetermined heat treatment is performed to expose the top end surface to the outside
Data Source
AI summary
A screw characterized by having a screw body having a male screw portion to be screw fastened into a corresponding screw hole and a top hat portion that is integrally formed to be conjoined to one end of the male screw portion and having a top end surface formed thereon; a torque transmission means that is used for transmitting to the top hat portion the running torque required for screw fastening the male screw portion into the screw hole and having a base end surface formed to correspond to the form of the top end surface of the top hat portion; and an adhesive solidification layer that bonds the top end surface of the top hat portion and the base end surface of the torque transmission means to mechanically couple the top hat portion and the torque transmission means.