SMART HELMET

Types of Industrial Safety Helmets

Not all hard hats are the same, and their level of protection will depend on their quality as well as their intended use. In general terms, we can find two types of hard hats tha are the most common today:

• Type I Hard Hats:These are the most widely used, and they’re designed to protect the user from vertical impact caused by falling objects. It’s not so effective when the force of impact is lateral or in any way off-centre.
• Type II Hard Hats:These types of hard hats have extra reinforcement inside to ensure they can withhold a wider range of impact which may come from any angle. They are a little more expensive, but are also safer, offering superior protection.

We can also find three different electrical classes in hard hats meant for electrical workers:

• Class G (General): These are the least expensive and most common electrical hard hats, offering a minimal grade of electric insulation. They will protect the wearer from electrical charges of up to 2,200 volts from phase to ground, provided the charge is applied to the hat.
• Class E (Electrical): These hats have a higher grade of electric protection, being able to block electrical charges of up to 20,000 volts. These hats are normally worn by workers who are routinely exposed to high voltage environments.
• Class C (Conductive): These types of hats actually offer no protection from electrical shock, providing instead increased conductivity to help dismiss static charges as well as offering increased breathability.

You can usually determine the type and class of a safety helmet by checking the inside label.

Helmet Colors

Understanding color codes of your industrial safety helmet
The color of a safety helmet is not just a decoration, but rather a code. Simply by looking at the colour of a helmet, you can easily determine the role that person plays in a construction site.

Here are the most typical colors which are generally used in most construction sites under safety law guidelines.

• White: Often reserved for administrative roles such as managers, engineers, foremen and all kind of supervisors.
• Blue: The color normally attributed to technical operators, most notably electricians, carpenters and all kinds of specialized workers.
• Green: Typically, workers wearing a green safety helmet are safety officers.
• Red: Much as it happens outside the construction site, this color is reserved for firefighters.
• Yellow: This tends to be the predominant helmet color in any given construction site, as it’s assigned to general laborers.
• Brown: Reserved for workers involved in high heat applications, including but not limited to welders.
• Grey: Site visitors will be given these hats to tell them apart from the site workers.

Occasionally, alternative color codes might be adopted for a given construction project, so it’s always a good idea checking with your supervisor if you have any doubts.

Shell

• Type
  • Hercules
  • Athena
  • Armadillo
• Material
  • PLA (Prototype)
  • ABS (Hard Hat)
  • SLA
  • MFJ

Accessories

• Lock
  • For Hercules (left-right motion)
  • For Athena (front-back motion)
• Suspension
  • 4 point
  • 6 point
• Retainer
  • Clip holder in helmet
  • Front Padding
  • Ratchet
  • Hinges (to conform with folding)
    • For Hercules
    • For Athena
• Chin Strap
  • Y-straps
  • Jaw Cup

Electronic Componentry

• Sensors
  • Arduino PRO
    • Nicla Sense ME
    • Nicla Vision
    • Portenta X8
  • Stroma Vision
  • Sony AITRIOS
• Battery
  • 3.7 V coin cell
  • 5.0 V coin cell
• Battery Housing
• Charging Unit
  • Magnetic Charger
  • Connector tips
• Power PCB
• Wires
• LCD
  • Azumo Tech

This details the design of the helmet suspension and chin straps for Numorpho’s Smart Helmets.

Hercules and Athena Helmet Types

This will be made of 3 semicircular strips with the top one being static and the bottom two articulating with the folding helmet.

• The bottom strips will be anchored to the lowermost slat with clips.
• There will be a rachet system in the back to conform with the fit to the head.
• There will be a front padding section touching the forehead.
• The four-point suspension system will collapse when the helmet is folded.
• The 4 clip system and the 4 hooks for the chin straps will provide for for a smooth inner surface for the helmet and will not cause and obstruction to the head in terms of protrusions.

For the Hercules design, the retention system will be anchored to the front apex.

For the Athena design, the retention system will be anchored to the two side apexes.

NITIN UCHIL Founder, CEO & Technical Evangelist
nitin.uchil@numorpho.co

DFMEA Criteria

ID	Item/Component	Function	Requirement	Potential Failure Mode	Potential Effects of Failure	Severity	Classification	Potential Cause of the Failure
1	Folding Helmet	Protect head	Must withstand impact	Structural failure	Head injury	9	Safety	Material defect
2	Slats	Allow ventilation	Must allow airflow	Blocked slats	Overheating, discomfort	4	Comfort	Debris accumulation
3	Sensors (Motion)	Detect movement	Must accurately sense motion	Sensor failure	Lack of motion detection	7	Functional	Electrical short
4	Camera	Record visuals	Must capture clear images	Camera malfunction	Loss of visual recording	6	Functional	Lens damage
5	Environmental Monitoring	Monitor conditions	Must accurately measure environmental parameters	Sensor inaccuracy	Incorrect environmental data	7	Functional	Calibration drift
6	Sensor Housing	Protect sensors	Must shield from impact and environmental damage	Housing crack	Sensor exposure and damage	8	Safety	Impact damage
7	Screws	Secure components	Must maintain tightness	Screw loosening	Components detaching	7	Safety	Vibration
8	Strap with Retainer	Secure helmet on head	Must not detach during use	Strap failure	Helmet falling off	9	Safety	Material wear
9	4 Point Suspension System	Distribute impact force	Must evenly distribute force	Uneven force distribution	Ineffective impact protection	9	Safety	Improper assembly
10	Front Padding	Cushion forehead	Must absorb sweat and provide comfort	Padding degradation	Discomfort, distraction	5	Comfort	Material breakdown
11	Chin Strap	Secure helmet under chin	Must not break or loosen	Strap breakage	Helmet falling off	9	Safety	Material failure
12	Chin Cap	Protect chin	Must absorb impact	Cap cracking	Chin injury	8	Safety	Material brittleness
13	Rear Ratchet	Adjust fit	Must allow size adjustment	Ratchet failure	Loose helmet	7	Safety	Mechanical wear

NITIN UCHIL Founder, CEO & Technical Evangelist
nitin.uchil@numorpho.com