Screws TRIZ Cases

Segmented shank threads, flutes, and chip breakers cut drilling time and raise pullout force without sacrificing ductility or strength.

A monolithic thread start leads and shields a separate helix element from tapping forces, preventing unwinding and simplifying screw manufacture.

A constrictable two-piece threaded fastener inserts axially, then expands to engage threads without rotational wear or added ergonomic strain.

Differential thermal contraction breaks sacrificial mold fasteners, allowing low-cost composite molds to release parts without damage.

A ringed deformed shank with a smooth-to-deformed length ratio boosts lateral and withdrawal strength while reducing fastener variety.

A flush domed roofing fastener removes sub-frames, enabling denser solar panel mounting with lower roof weight, cost, and visual impact.

Controlled 500-600°C forming preserves beta-metastable titanium fastener microstructure, reducing cracks while keeping high strength and ductility.

Axial ridges split grout in a helical wedge groove into controlled segments, enabling predictable wedge activation and stable anchoring loads.

Form rolling in the A2 phase then aging to L21 enables Cu-Al-Mn screw threads with better productivity, fatigue resistance, and break resistance.

Temporary bore-engaging dowels and a linking member let heavy assembly components be lifted, positioned, and released without damage.

A one-piece threaded tree fastener uses a conical collar and modular extension to maintain structural support while allowing trunk growth.

A concave neck links drill bit and drill tail cutting edges to move chips efficiently and reduce drilling deviation and shaking.

A radial cutter splits the nut across the screw axis to save axial space, limit bending stress, and enable fast controlled release.

An integrated link receiving part prevents a hanging link from striking cargo under vibration while preserving free movement and reducing parts.

Spiral crushing ribs and discharge gaps help wood screws clear chippings, lower screwing pressure, and reduce cracking in dense wood.

Alternating anchoring threads strengthen the wood-concrete interface, improving shear resistance and composite board rigidity.

Inward-pressing milling ribs and head cavities countersink wood cleanly, reducing fringes, breakage, and uneven hole edges.

Different thread diameters and a smooth intermediate section let one screw align existing holes and grip enlarged, worn receiving cavities securely.

A liquid metal eutectic severs a structural bolt on command without explosive pressure or fragments, reducing shielding needs near sensitive components.

Flutes, pilot threads, and a detent region clear stone powder during installation, cutting energy use while improving pull-out resistance.

Inward-pressing milling ribs cut and compact wood fibers to create cleaner countersunk holes with fewer fringes and stronger screw holding.

Hardenable grout fills the annular gap after screw removal, restoring anchorage in mineral substrates despite dust relocation.

Cone-head recesses add radial and longitudinal cutting, improve locking stability, and hold cutting waste for smoother countersunk fastening.

Pressurized air routed through a dual-seal mouthpiece checks blind rivet sealing before setting, cutting rework and part rejection.

Balanced handle placement cuts wrist fatigue, while a locking sleeve and plunger ejection mechanism speed sheared bolt tip removal.

A split tip with blade portions, concave surfaces, and discharge grooves improves positioning, clears chips, lowers screwing resistance, and helps prevent cracking.

Tapered pressing sections, raised lower tooth surfaces, and anti-pullout planes cut driving resistance while strengthening screw anchoring.

A two-body insertion tool transfers force through the fastener head and sleeve flange to achieve interference fit without damaging the fastener or structure.

Controlled two-stage heat treatment shapes alpha-beta microstructure so titanium fasteners keep high strength while avoiding thread-forming defects.

A reduced-diameter tap flute centers the screw in plastic pilot holes, cutting friction and torque for straighter, more precise insertion.

A separate thread helix contracts into the shank during hammer-in installation, enabling reliable anchoring in undersized concrete boreholes.

Interrupted thread windings with cutting and inhibition webs lower insertion torque, balance loosening torque, and widen opening tolerance.

Matching wedge and positioning features keep a semi-hollow F-SPR rivet aligned at high speed, reducing gaps and joint failure.

Variable flank angles in the thread valley and ridge enable easy insertion while increasing friction against loosening.

Integrated wing-shaped stop pieces and flat portions let the screw halt at a preset depth while simplifying fabrication and improving locking force.

An integrated hard-elastic covering on the head and neck of a fastener cuts structure-borne noise while preserving load transfer and assembly reliability.

A support insert with a smaller through-hole compacts fibers around the screw, preventing bulging and improving fastening in thin fiberboard panels.

Threading dies form the external thread and stop flange in one step, limiting over-feeding and reducing screw wear or breakage.

A double-thread tip and recessed milling ribs let the screw pierce metal sheets without chips and anchor securely in wood with less pre-drilling.

Variable thread angles, detent regions, and flutes clear stone powder during concrete screw installation while lowering effort and improving pull-out resistance.

Helically staggered reaming blocks clear wood chips and spread stress, reducing cracking and lowering screwing effort in wood joints.

A coaxial sleeve layout and center-of-gravity handle reduce wrist fatigue while enabling clean ejection of the sheared bolt tip.

An asymmetric thread flank profile improves material flow, failure torque, and pretensioning force in direct screw joints for light metal castings.

Sealed bearings and an eccentric locking shaft let a quick-release retaining pin secure structures without releasing foreign object debris in clean rooms.

A variable-width recess guides a self-tapping screw before threading, cutting watch plate assembly turns and preventing dislodgment.

A rear counterweight layout cuts wrist fatigue, while a spring impact mechanism ejects the sheared bolt tip for faster reuse.

An enlarging tip and thread-free underhead volume let displaced plasterboard material escape, reducing bulging during fastening to metal supports.

Spiral crushing ribs break sawdust and disperse chips, cutting hardwood screw-in torque, tooth wear, and wood cracking risk.

A head sized close to the thread diameter avoids countersinking, reducing mushrooming, material loss, and extra sanding in soffit lining installation.

Multiple stepped tip sections punch and sever wood fibers, improving screw penetration while reducing splitting and cracking in wood-based materials.