Screws TRIZ Cases
- Wood Screw With Convex Conical Tip And Double Thread
A wood screw features a convex conical tip section with a double-start thread to displace material efficiently.
- Triangular Shank Screw Asymmetrical Threads
Triangular shanks and asymmetrical threads reduce friction and expel chips, preventing cracking in composite materials.
- Self-Centering Screw with Diametrically Opposed Support Elements
Support elements positioned opposite cutting features prevent tilting in hard materials, ensuring reliable fastening without damaging the borehole.
- Crack-Proof Screw With Segmented Threads
Segmented threads distribute drilling force, preventing material cracking while aiding chip removal.
- Coaxial Feed Drive for Compact Joining Devices
A coaxial feed drive transmits axial force through a nested spindle mechanism, reducing device weight while maintaining high reliability.
- Hollow Bolt Longitudinal Grooves Rolling Deformation
Longitudinal grooves in hollow bolt annular walls absorb displaced material during rolling, preventing radial deformation and maintaining dimensional stability.
- Chipless Thread-Forming Screw Shank Segmentation
A chipless thread-forming screw shank uses a frustroconical tip and cylindrical section to penetrate metal sheets without pre-drilling.
- Wedge Fastener Sleeve Reduces Assembly Time and Particle Generation
A wedge fastener sleeve secures components via friction and normal force without requiring rotational engagement.
- Screw Head Rib Projections for Coating Protection
Radial rib-like projections on the screw head mill material surfaces to prevent coating damage during countersinking and ensure watertight seals.
- Self-Tapping Screw with Additional Thread for Wood Splitting
An additional thread with smaller pitch and lower profile height in the screw tip reduces splitting effect and crack formation in wood.
- Post-Installed Anchor Bolt Rotation Expansion Mechanism
Rotating the fixation member widens expansion pieces that bite into pilot hole walls, resolving slippage under high tensile loads.
- Lightweight Cartridge Casing with Deformable Joint
A cartridge casing joins a tube and head cap via a deformable member to reduce mass while maintaining structural integrity.
- Screw Head Recesses and Thread Crests Manage Debris
Thread crests cut wood fibers into debris while head recesses scrape and hold the waste to prevent surface cracking.