Project Bryan meets the needs of Bryan, a child with severe cerebral palsy that causes him to have involuntary physical movement and an inability to communicate. It is the goal of Bryan’s family to always include him in their active lifestyle. Currently, the family uses a baby stroller and baby chariot to transport Bryan that are not suited for a growing child or the family’s active lifestyle. Suitable high-end strollers for Bryan are very expensive and the family requests for an inexpensive design. The overall objective of the project is to create a custom chariot for daily use that is fairly inexpensive, is easily portable, be able to maneuver through all terrains, and supports his growth.
Team Pack in Motion has modified an existing chariot to attach a car seat with a LATCH system to a BOB all-terrain chariot. To increase portability, Pack in Motion developed an adapter that attaches to the chariot and allows a car seat to easily snap into it using the LATCH system. Utilizing Bryan’s existing car seat allows the family to quickly set Bryan up for trips without taking him out of the car seat. The chariot and platform gives Bryan and his family a cheaper and easily portable alternative to expensive and heavy all-terrain chariots for children with disabilities. This webpage covers the design and manufacturing process of the chariot and seat.
For more information on Cerebral Palsy please visit:
- Center for Disease Control and Prevention: Cerebral Palsy
- Cerebral Palsy
- Mayo Clinic: Cerebral Palsy
Problem and Objective:
The sponsor, Lorraine Howard of Washoe County School District, and the family would like a chariot for Bryan that can maneuver easily over hiking trails and the beach, easily portable, comfortably seat Bryan, and be inexpensive. Currently they use a baby stroller, chariot, and a school stroller to move Bryan around. The baby stroller is used for daily errands, the baby chariot is used for hiking, camping, and going to the beach, and the school stroller is only used for school.
Problems current equipment faced:
- Stroller and Chariot are designed for babies
- Plastic wheels on stroller cannot handle rough terrain
- Chariot is bulky, heavy, and takes time to assemble
- Heavy duty stroller is very expensive, heavy, and only suitable for indoor use
Pack In Motion chose to modify the BOB Stroller Revolution Flex all-terrain stroller. The modification allowed the family to utilize their already purchased custom carseat. The platform adaption for the BOB stroller allowed the carseat to attach to the stroller for portability and ease of use.
Functions of the design include:
- Light weight BOB stroller frame
- 2 step folding
- Carseat with LATCH able to connet to platform
All-terrain Frame:Pack In Motion did not want to start from scratch. The team decided to research the best existing stroller that can fit the family’s needs. The BOB Stroller Revolution Flex was a perfect selection for their needs. The stroller has a quick two step folding process and is very lightweight. It has a swiveling front wheel for easier turns and also locks forward for difficult terrains. A shock absorber provides a smooth ride. The handlebars rotate up to provide comfort to various heights of the caregivers. Overall this frame gave the team a solid base for the final design.
Platform: The stock seat for the stroller was taken out to make room for a platform made out of steel that will allow Bryan’s car seat to snap in place. The car seat already has a latch built in to snap into the car easily. To utilize the snap feature, the team will weld on the platform two hooks that the car seat can snap into. The platform will be connected to the frame with brackets that are 3-D printed using the 3-D printers from the university. There are two settings, flat and tilted. Making the platform flat will make it easier for the caregiver to place the car seat on the platform and snap it into place. Tilting it will make the car seat rest on the bars of the stroller frame for support. For added safety, a latch will be added to the tilt so that the platform will stay in place once tilted, and restraints will be attached to tightly wrap around the car seat and frame to keep the seat in place. Additionally, Velcro will be placed on the platform and the bottom of the car seat to prevent the seat from wiggling around when the chariot is moving. Using this platform will utilize the current seat and allow for easier transportation of Bryan.
Tire: The stock tires are meant for all terrains, however, the team wanted to add a wider tire for better transportation around beach sand. The back tires of the stroller are detachable. An axle was manufactured for the wider wheels so that it can attach to the frame. Creating the axle and connecting it to the tire allows the caregivers to have a choice between the two pairs of tires.
Footrest: The footrest was designed to catch Bryan’s feet. It is able to fold with the frame. The footrest brackets were 3D printed and the foot-catch area was manufactured using the recycled parts that came with the bought stroller. The foot-catch was made using the fabric and rods from the stock sunshade. Velcro straps were also sewn on to secure his feet from moving around.
1) The LATCH hooks were MIG welded onto the steel platform. The hooks were spaced according to automotive standards for the LATCH hooks in cars after 2006.
2) Rubber lining was placed on the edges for safety.
3) The crossbar was cut out of a 1″ double extra heavy aluminum tubing. The brackets that connect the crossbar to the platform were machine cut from a solid piece of ABS plastic. The studs used to connect the plate to the crossbar are 1 1/2″-20 bolts welded to the steel plate.
4) The brackets that connect the platform to the BOB stroller frame are designed using the SolidWorks software then 3-D printed by the DeLamare Library. There are eight 1″ bolts used to hold the platform to the frame.
1) The feet catcher was made by bending recycled metal by hand. It was bend in a U shape to catch the feet. The fabric was made by sewing together the fabric that was not used that came with the BOB stroller. Velcro was sewn on to catch the feet.
2) The footrest brackets were 3-D printed. Each bracket is made up of two parts put together. The feet catcher slips into the rod holes and the footrest bracket is bolted onto the frame.
1) An axle was made out of 1045 CD steel round stock. A retainer clip from McMaster-Carr was used to keep the axle and wheel as one unit for the care givers convenience.
FEA and Testing
Bracket Connection For Platform: Before the brackets to connect the platform to the frame were 3-D printed, analysis of the design was done on Solidworks. Safety is a key factor of the design. The brackets were simulated to test the maximum weight they can hold. The brackets tested to have a factor of safety of 3 which exceeded expectations.
Testing: Pack In Motion conducted much testing on the final prototype in order to ensure that all specifications were met and that the chariot was safe and efficient for the family. Maneuverability and Collapsibility were tested and compared to the family’s existing equipment. To test maneuverability, the team measured the force it would take the old chariot and stroller to go uphill and at a decline for grass and gravel. The team compared those values to the final design with the stock and beach tires. Additionally, the team tested the collapsibility by recording the opening and folding time. From the table, the positive percentage difference indicates that the existing equipment is less efficient compared to the final design. Through the design process, Pack In Motion developed a safer and more efficient way of transportation for Bryan as he joins his family in their favorite activities.
About The Team
Patrick Nipay is a senior at the University of Nevada, Reno pursuing a mechanical engineering degree and a Renewable Energy minor. Patrick was born and raised in Reno, Nevada. Throughout his college career he became a member of the Phi Delta Theta Fraternity, volunteered for outreach as a tour guide for Nevada Student Ambassadors, participated and tutored students in the Trio Scholars program for first-generation low income students and conducted summer research through the McNair Scholars program. Patrick will graduate in the spring semester of 2015 with a Bachelor of Science in Mechanical Engineering. Patrick’s interest includes Electric or Hybrid vehicles. Patrick’s future goals are to get a Master’s degree in Engineering or Business and to work for Tesla Motors.
Jesse M. See
Jesse M. See is a senior at the University of Nevada, Reno. Born in Winnemucca Nevada, he started his path to the university through a mining contracting company. As a part time shop sweeper in high school, he worked his way up through the shop learning everything he could about machinery, equipment, and shop management. Jesse will receive a Bachelor of Science in Mechanical Engineering in May 2015. After graduation Jesse will pursue his Professional Engineering license in Nevada, and chase his dream job as an engineer for Yamaha in their off-road department.
Zadyt Mendez is a senior mechanical engineering student at the University of Nevada Reno. He was born in Long Beach, California, but has lived most his life in Mesquite, Nevada. Zadyt is part of the American Institute of Aeronautics and Astronautics club (AAIA) on campus and has held an executive position in the Pi Kappa Phi fraternity. He enjoys a variety of sports with soccer as his favorite. Zadyt will graduate with a Bachelor of Science in Mechanical engineering and a minor in mathematics in May 2015. He is an Engineer in Training and plans to attend graduate school to further his engineering degree; Zadyt’s future goal is to one day end up working with drone technology at Insitu.
David Ramirez Dominguez
David Ramirez Dominguez is a senior mechanical engineering student at the University of Nevada, Reno. David was born and raised in Reno, Nevada. Throughout his college career he has been a part of the Multicultural Geek council, and a member of Lambda Psi Rho Fraternity Inc. David Will graduate in the spring semester of 2015 with a Bachelor of Science in Mechanical Engineering. David Future goals and ideal job is to work with renewable energy in motor vehicles and working for Toyota or Chevrolet.
Orlando Arambula is a fifth-year engineering student at the University of Nevada, Reno. Orlando was born in Chicago, Illinois. Through out his college career, he has been part of the Concrete Canoe Team, involved in Greek Intervasity, and a member of Phi Delta Theta Fraternity. Orlando will graduate with a Bachelor of Science in Mechanical Engineering and a minor in Mathematics in May of 2015. Orlando plans on going to graduate school in order to pursue a Masters Degree in Engineering or Business.
Leah Ochs (Team Mentor)
Leah Ochs graduated from the University of Nevada, Reno in May of 2013 with a Bachelor of Science in Mechanical Engineering. She currently works for Click Bond in Carson City, Nevada. She is in manufacturing as a mechanical engineer. She was chosen as a mentor for Pack In Motion because of the similarities between this project and her capstone project in 2013. Her team High Roller Stroller created an Adjustable All-Season Stroller for a student with Congenital Disorder of Glycosylation (CDG) syndrome. Leah guided the team using her past experience with this similar project.
Pack in Motion would like to thank Dr. Emil Geiger for his continuing support through this project, and being available to meet and discuss the project design. Pack in Motion would also like to thank Leah Ochs for her mentorship over decisions and overview of the project. Leah Stolworthy for helping sew together the footrest. Lorraine Howard from Washoe County School District provided a lot of support throughout the project and gave feedback on the design. Pack in Motion would also like to thank Bryan’s family, for meeting with the team and being such great support. Speeds of Air of Reno, Carwil L.L.C, Anthony Piazza (UNR machine shop) were also a big part for accomplishing the final building. Also Pack in Motion wants to thank Click Bond for their help and donations of 3D printing services.