Undergraduates' invention makes guns childproof

May 11, 2000

Inexpensive device could prevent accidental shootings by youngsters

A device that keeps young children from firing a handgun, without relying on electronic components, keys or combination locks, has been invented by undergraduate engineering students at The Johns Hopkins University. In pilot tests conducted by the students, children up to age 7 could not defeat the child-proofing device. Adults, however, were able to move the weapon into a firing mode within three seconds.

In an important added precaution, the device automatically switches the gun back to "safe" mode as soon as the weapon leaves the adult's hand. Unlike trigger guards, which usually require a key or combination and can be awkward to remove, the Johns Hopkins students' device works by covering and manipulating a pistol's existing safety lever. The students describe the mechanism as durable yet inexpensive. If gun manufacturers incorporated this childproofing device into their products, the inventors estimate it would increase a handgun's retail price by no more than $35.

Senior mechanical engineering majors Richard Glorioso, 21, of Baltimore, and Bryan Rydingsward, 22, of Canton, Conn., designed and built the safety device during a two-semester course in which students tackle real-world engineering assignments, working within maximum budgets of $6,000 to $8,000. (The students came in well below their budget, spending about $4,500.) Curt Ewing, a laboratory administrator for the university's Department of Mechanical Engineering, devised a crucial component to help return the gun to its "safe" mode when it leaves an adult's hand. The students and Ewing jointly have applied for a patent on the device and will seek to interest gun manufacturers in the invention.

The class project was launched last fall with funding and a challenge from the Center for Injury Research and Policy at The Johns Hopkins School of Hygiene and Public Health. "What they wanted was an inexpensive device that would childproof a handgun for children 6 years old and younger," Rydingsward said. "At that age, kids don't understand the magnitude of what handguns can do."

Seven years ago, students in this same Johns Hopkins class devised a crude electronic "smart gun" that could only be fired by its owner. University researchers challenged the industry to refine this idea, setting off an intense, continuing debate over the cost and reliability of high-tech handguns. For their childproofing device, however, Glorioso and Rydingsward took a "low-tech" approach, sticking with the simple springs and other mechanical parts that are already used in conventional handguns.

The student engineers designed a metal cover that could be fastened atop the barrel of a 9-mm semiautomatic pistol, covering the safety lever and forcing it into the position that prevents the gun from firing. When two buttons are depressed, the cover slides open, exposing the safety switch and allowing the user to put the gun into its "fire" mode. Small children lack the dexterity, finger strength and mental agility to open the sliding door, the students discovered during tests with young children. Yet these children's mothers had no trouble opening the cover, the inventors said. That was important, the students said, because adult gun owners want to be able to arm themselves quickly if they hear a home intruder at night. With minimal practice, Glorioso said, "you could open the cover and flip the safety lever with your eyes closed."

But what if the "intruder" turned out to be merely a noisy family pet, prompting the sleepy gun owner to set the weapon down on a night stand, where a child might later pick it up? As a secondary precaution, the engineering students, with help from Ewing, added another mechanism to the handle of the gun. As a result, when the grip is released, the cover automatically springs shut and returns the safety lever to its "safe" position.

"This device does the two main things we hoped it would do," said project sponsor Andrew E. Lincoln, assistant scientist at the Center for Injury Research and Policy. "First, it provides a means of protecting young children without inconveniencing the gun owner in terms of time or excessive cost. And second, it provides passive protection, meaning it doesn't require the adult to do anything other than put the gun down to re-activate the safety."

Lincoln added, "There is overwhelming public support for making guns more childproof. Despite that kind of support, the manufacturers haven't responded. So this project had a limited scope and a specific purpose: We wanted to show that a device like this could be designed and built over an eight-month period. The students proved it could be done."
The childproof gun was one of 11 Johns Hopkins projects completed this year by undergraduates in the Whiting School of Engineering's Design Project course taught by Andrew F. Conn, a Johns Hopkins graduate with more than 25 years of experience in public and private research and development. Each team of two or three students, working within budgets of up to $8,000, had to design a device, purchase or fabricate the parts, and assemble the final product. Corporations, government agencies and nonprofit groups provided the assignments and funding.

Reporters, editors: Color slides of students and their childproof gun device available; see images and contact Phil Sneiderman

3003 N. Charles Street, Suite 100
Baltimore, Maryland 21218-3843
Phone: 410-516-7160 / Fax 410-516-5251

Johns Hopkins University

Related Children Articles from Brightsurf:

Black and Hispanic children in the US have more severe eczema than white children
A presentation at this year's virtual American College of Allergy, Asthma and Immunology (ACAAI) Annual Scientific Meeting reveals the disparities that exist for Black and Hispanic children when it comes to Atopic Dermatitis (AD), commonly known as eczema.

Black children with cancer three times less likely to receive proton radiotherapy than White children
A retrospective analysis led by investigators from Brigham and Women's Hospital has found racial disparities in the use of the therapy for patients enrolled in trials.

The Lancet Child & Adolescent Health: First Europe-wide study of children confirms COVID-19 predominately causes mild disease in children and fatalities are very rare
Children with COVID-19 generally experience a mild disease and fatalities are very rare, according to a study of 582 patients from across Europe published today in The Lancet Child & Adolescent Health journal.

Children not immune to coronavirus; new study from pandemic epicenter describes severe COVID-19 response in children
- While most children infected with the novel coronavirus have mild symptoms, a subset requires hospitalization and a small number require intensive care.

How many children is enough?
Most Russians would like to have two children: a boy and a girl.

Preterm children have similar temperament to children who were institutionally deprived
A child's temperament is affected by the early stages of their life.

Only-children more likely to be obese than children with siblings
Families with multiple children tend to make more healthy eating decisions than families with a single child.

Children living in countryside outperform children living in metropolitan area in motor skills
Residential density is related to children's motor skills, engagement in outdoor play and organised sports. that Finnish children living in the countryside spent more time outdoors and had better motor skills than their age peers in the metropolitan area.

Hispanic and black children more likely to miss school due to eczema than white children
In a study that highlights racial disparities in the everyday impact of eczema, new research shows Hispanic and black children are more likely than white children to miss school due to the chronic skin disease.

Children, their parents, and health professionals often underestimate children's higher weight status
More than half of parents underestimated their children's classification as overweight or obese -- children themselves and health professionals also share this misperception, according to new research being presented at this year's European Congress on Obesity (ECO) in Glasgow, UK (April 28-May 1).

Read More: Children News and Children Current Events
Brightsurf.com is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to Amazon.com.