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Helmet Strap Tightening Mechanism INNOVATION PROJECTS
IIT DELHI

Varsha Kumari, Prof. Atul Narang, Dr. Haider Ali
IIT Delhi

The main aim of this study is to design a strap tightening mechanism for a motorcycle helmet which ensures that the
helmet should not fly off the head during an accident. The mechanism is designed in Creo parametric modeling
software and manufactured by various machining processes including 3D printing and machining. The developed
mechanism was tested under impact and fatigue load according to Snell standards. It worked successfully under impact
and upto 60,000 cycles under fatigue.

Finite element analysis was done for stress analysis
of the locking mechanism. The developed
mechanism was successfully passed all the required
tests. A mechanism has been designed with auto
adjustable and self locking capabilities. The former
ensures that the strap is adjusted automatically at
the chinrest and the latter ensures that the helmet
will be retained on the head during an accident.