Mechanical Interface
Stability.
Issued U.S. patents for a mechanical locking architecture that resists vibration-induced loosening in bolted joints, available for field-of-use licensing.
PatentsUS 9,422,969 B2
US 8,398,349 B2
US 8,226,158 B1
Industries
Programs
Licensing Stages for
Qualified OEM
Evaluations
Failure Physics First.
Then the Architecture.
Failure mechanism addressed: under transverse vibration, bolted joints self-loosen through repeated slip at the threads and bearing surfaces (Junker, SAE 690055, 1969). INERTRA™ Retention pairs opposite-hand threads so that backing off one element would require tightening the other.
Why bolted joints lose preload
- Transverse vibration and cyclic excitation
- Rotational micro-movement at the interface
- Surface embedment and load relaxation
- Thermal cycling and repeated service loads
What must remain controlled
- Clamp-load stability over time
- Resistance to rotational back-off
- Reduced interface micro-movement
- Serviceable retention without adhesives
How INERTRA™ is positioned
- Nut and opposite-hand bolt that lock against each other
- Mechanical constraint of back-off rotation
- Applicable across high-vibration and high-cycle assemblies
- Qualified through the licensee’s own engineering validation path
Patented Retention
Architecture.
A nut threads onto the stud. An opposite-hand bolt threads into the stud's internal bore, and its head seats in notches on the nut. The turn that would loosen the nut tightens the bolt, so each element blocks the other's back-off. Retention is mechanical, not adhesive.
Why Existing Approaches Fall Short
| Approach | Addresses Root Cause? | Adhesive? | Retorque Burden? |
|---|---|---|---|
| Thread locker | No: chemical symptom management | Yes | Often retained |
| Lock washer | Partial: friction-based resistance | No | Often retained |
| Inspection / retorque schedule | No: detects rather than prevents | N/A | Is the burden |
| INERTRA™ Retention | Mechanical interlock against back-off rotation | No | Intended reduction* |
* Subject to licensee engineering validation for the specific application and duty cycle.
U.S. Patents
Each family maps to a specific interface failure mode. The portfolio is an architecture platform, not a component catalog. Licensing is field-of-use structured and OEM-qualified.
Inventor and owner of record of three issued U.S. patents spanning mechanical retention and vapor suppression architectures.
Managing Partner, Ireland Design Company, and owner of the INERTRA™ trademark. Point of contact for OEM evaluation and field-of-use licensing.
If the Problem Is Real,
the Conversation Is Worth Having.
If your systems operate under sustained vibration, cyclic loading, or rotational instability, and the maintenance cost or downtime exposure is material, this is the right channel.