Restraint Systems

Dr. Renfroe has studied the mechanical properties of restraint systems, such as seatbelt buckles and retractor systems.  Dr. Renfroe and Dr. Thorbole, Biomechanist & Occupant Motion Specialist, have an understanding of the interaction of the seat back and airbags in occupant motion during vehicle collisions. Most significantly they understand the effects of airbag deployment timing and seat back deflection during a collision on occupant injury potential.

Restraint Systems Publications:

2011 - Design and Evaluation of a New Portable Restraint for Motorcoach Rollover

2010 - Investigation of Inertial Unlatching of Side Release Seat Belt Buckles


The following video is an excerpt of Dr. Renfroe's interview with CNN concerning his analysis of the fatal accident of Princess Diana.

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The following video is from one of our seatbelt buckle tests.

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About Us

EI Consultants, LLC was organized in 1984 by Dr. David Renfroe. The company is now owned by Stanley Andrews.

EI Consultants, LLC provides engineering consulting, research and public services relating to the automotive industry.

Expert Services: Vehicle Safety Research, Safe Vehicle Component Designs and Accident Reconstruction.

Presentation Services: Trial Director Presentations, Large Format Diagrams, Animation and Digitization.

Other Services: Complete Lab, Shop and Test Facilities, Vehicle and Evidence Storage and Low Speed Rear Impact Injury Analysis.

Contact Us

13045 W. Hwy 62
P.O. Box 610
Farmington, Arkansas 72730

479-846-8002 Fax

Office Hours: 8a.m. - 5p.m., M-F


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