Screws TRIZ Cases

Opposing inner and outer helices reduce compressive stiffness while increasing graft space, pullout strength, and bone ingrowth.

A resilient polymer sleeve expands under a threaded post to simplify wall mounting, improve grip, and allow repeated removal and reuse.

A widening timber thread improves wedging and anchoring in timber while keeping composite screw manufacturing effort low.

Opposed groove regions, cutting ribs, and drill thread segments improve chip removal, lower drilling resistance, and help prevent workpiece cracking.

Asymmetric thread flanks, ribs, and discharge grooves clear chips faster to cut screwing resistance and improve pull-out resistance.

A two-stage FDS installation profile switches from high-speed penetration to lower-speed thread forming to cut torque in thick substrates.

Opposed groove regions, cutting units, and slanted join walls let the drill tip cut quickly, clear chips, reduce resistance, and limit cracking.

An inner groove in the vertical hole lets a banjo bolt form small lateral holes by press working while preserving fastening axial force.

A variable-length tipward taper zone improves concrete thread cutting and formation while preserving screw stability during installation.

Welded dual-steel shaft parts give concrete screws a hard cutting tip and a corrosion-resistant shank while protecting thread rolling tools.

A metal sealing protrusion on a threaded vehicle fastener creates high local pressure to deform mating parts and prevent joint leakage.

Pressurized fluid locks the fastener body and supports ejection, reducing manual holding force while keeping temporary fixing stable.

Multiple helical thread sections reallocate material to the shank, cutting torsional stress and reducing fastener breakage in concrete.

Separate shank and thread components let one screw balance hardness, ductility, and corrosion resistance while simplifying variant manufacturing.

A dual-thread layout concentrates gripping near the tip, reallocates material to the shank, and reduces torsional failure in concrete fastening.

Notched thread crests and knurled troughs cut fibers, clear chips quickly, reduce screwing resistance, and improve tight engagement.

Grooves and axial slots create chip space that cuts driving resistance, speeds screw insertion, and improves anti-loosening engagement.

Segmented shank geometry with flutes, chip breakers, and tapered cutting edges cuts drilling time while raising pullout force.

An angled sheet metal connector improves deck anchoring where joist access is limited, while transferring tension, uplift, and lateral loads.

Axial ridges split the helical grout string at defined break points, enabling controlled wedging and more consistent load-bearing capacity.

A concave neck and segmented cutting grooves redirect chips to prevent accumulation, reduce screw shaking, and keep drilling on position.

A conical fastening screw simplifies roller mounting by easing poly-V belt installation first, then generating working tension as tightening proceeds.

Axial acceleration triggers the shift from high-speed penetration to lower-speed thread forming, helping prevent incomplete penetration and joint stripping.

A prism-shaped anchor body with drilling and milling elements cuts and widens gypsum board holes for secure one-step fastening.

A tapered reverse-helix turnlock bolt resists spinning and slipping during fastening, enabling stable single-sided installation.

A three-thread drilling fastener clears chips from cut fibers to lower drilling resistance, speed insertion, and help prevent workpiece cracking.

A counterclockwise secondary thread clears chips and grinds wood, reducing driving resistance, pressure, and cracking during screw insertion.

A tapered self-tapping screw and matching housing speed watch plate assembly while improving guidance, retention, and holding strength.

Multiple lands and cutting flutes let the screw self-drill bone while keeping a blunt tip profile that helps limit soft-tissue damage.

Oblique ribs between thread convolutions crush and disperse concrete debris, lowering friction and keeping the screw aligned in the hole.

A tapered thread-free insertion end with longitudinal grooves reduces tilting, dust blockage, and screwing torque in drilled concrete holes.

Discrete thread segments slide into a screw hole, then expand outward for secure fastening and quick removal with less installation time.

A transverse pin channel and guided insertion instrument stop Charcot foot screw migration while limiting surgical exposure and infection risk.

Different stainless steels in the shank and thread helix balance concrete cutting hardness with corrosion resistance and brittle-failure reliability.

A circumferential support element adds a second contact point to limit outer shell tilting, preserve sealing, and simplify fastener production.

A non-revolving detachable tip pierces and heats joined parts, then breaks away to remove the protruding point and reduce assembly mass.

Local heating of a thickened lower plate boosts ductility during self-piercing riveting, suppressing cracks while maintaining joint strength.

A dual-seal mouthpiece feeds testing fluid around a blind rivet head to verify sealing before setting, cutting rework and final leak checks.

A drill tip, flutes, chip breakers, and hardened surface shorten drilling time and increase pullout force without sacrificing ductility or strength.

A partial auxiliary thread redistributes rolling stress in a self-tapping screw, reducing bending, stress concentration, and installation difficulty.

An angled seat-and-back connector simplifies deck-to-joist installation while distributing tension, uplift, and lateral loads to wood or concrete.

Shoulder bolts pre-attached to shelf beams slide into keyhole slots, cutting assembly time while preserving strong, adjustable load-bearing support.

A segmented cutting thread and curable compound improve deep concrete anchoring while lowering screw-in torque and crack risk.

A transverse hanger recess and threaded section let one concrete screw support both slab and plasterboard ceiling suspension with fewer errors.

Polygonal head cutters create a clean counterbore with minimal fiber exposure while lowering torquing force across building materials.

A concealed panel joint uses snap-in plugs, a blind hole, and front access to secure perpendicular furniture panels without visible holes.

A pressing-handle expansion bolt enables tool-free fixing and quick removal while maintaining fixation strength and reusability.

Variable-width threaded units create gaps that cut driving friction in wood while arch-shaped surfaces improve screw holding power.

Radial ribs recessed in a frustoconical screw head improve pull-out resistance while staying protected from insertion damage and loosening.

Radial ribs in an annular head recess improve screw grip and contact stability, while a frustoconical section protects the ribs during insertion.