Undergraduate Design Team Charles Stepaniuk Hugo I. Gallegos Daniel Totong [email protected]...
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Transcript of Undergraduate Design Team Charles Stepaniuk Hugo I. Gallegos Daniel Totong [email protected]...
Undergraduate Design Team Charles Stepaniuk
Hugo I. Gallegos Daniel Totong
Automatic Retractable Wheelchair Canopy
International Design Engineering Technical Conference September 5, 2007
Introduction
Awards: 1st Place: Stony Brook University2007 Mechanical Senior Design Assistive Technology 4th Place: ASME Mechanism Design2007 International Student Design Competition
Patent Pending
The video of operation is available on YouTube. Keyword: Stony Brook Mechanical Engineering
For business interests please contact Charles Stepaniuk at [email protected]
Agenda
1. Introduction
2. Market Analysis
3. Product Design Specification
4. Conceptual Design
5. Detail Design
6. Summary and Future Work
Introduction
Automatic Retractable Wheelchair Canopy: • Electromechanical system designed to provide switch
activated rain protection for wheelchair bound handicap people
• Canopy automatically assembles above the handicap person and wheelchair
• Canopy automatically retracts into a folded position behind the backrest
Market Analysis
Figure 1: The Weather Breaker
The Weather Breaker• Invented by Daniel D. Gistel• Patented in 1989• Manufactured by Diestco
Manufacturing• Manually mountable• Manually removable• Dismantles and stores in
portable bag.• Bracket w/ clamp and fitting: - Supports frame - Clamps to wheelchair or
scooter.
The Third Arm• Invented by Gary L. Etter• Patented in 1994• Manufactured by The Third
Arm Umbrella Hold• Fitting for an umbrella
handle• Clamp adjusts wheelchair• Right, left, forward and
rearward angular adjustment
• Length adjustmentFigure 2- The Third Arm
Market Analysis
Major Considerations• Should provide automatic rain protection with a mechanism
that retracts into a confined space.• Should provide serviceable rain protection• Should not negatively impact the wheelchairs stability. • Should not restrict motion through typical building systems.• Lightweight structure with significant load bearing ability.• Components should be corrosion resistant.• Canopy upholstery should endure the operating cycles • Should be available as a mount-on kit.• Should provide emergency stop and manual gear by-pass. • Should be accessible to people within a variety of income
levels.
Product DesignSpecification
Conceptual Design
1. Convertible CanopyConcept: The linkage system used for convertible car canopy’s is mounted to the backrest of a wheelchair and redesigned to extend above the wheelchair.
Conceptual Design
2. Telescoping Canopy Roll
The canopy upholstery extracts from a spring loaded roll attached to a telescoping link located at the top of the backrest. A prismatic joint exists along the sides of the backrest and allows a link connected to the cloth material to extract the upholstery.
Conceptual Design
3. Baby Stroller Canopy The U-Tube linkage system commonly found on baby strollers is pivoted in the upper portion of the backrest and designed to extend from
its folded position behind the backrest to above the wheelchair.
Detail Design
Objective• Simple mechanism
• Inexpensive
• Compact
• Durable
• Safe
• Low maintenance
Detail Design
Design Challenges
• Gear selection and mounting
• Canopy material selection and mounting
• Electrical circuit
Detail Design
Electrical Operation
and Controls
• 24 VDC system• User operation by a 3
way switch• Forward and reverse
limit switches• Wiring between the
power source, switches and motor.
Detail Design
Drivetrain-Motor• Geared motor• Motor attached to the main mount bracket by
the motor mount plate
Drivetrain-Gears
• Motor transmits motion thru the worm shaft and coupling to the worm gears and main shaft
• Mounted bearing and collar provide extra support for the drive assembly and ensure gear alignment
Detail Design
Detail DesignMain Mount Bracket• Supports all of the drivetrain components • Supports all of canopy structural components • Mounting bolt attachment
Detail Design
Ribs and Rod Ends
• Main shaft drives rib 1• Rib 1 pulls ribs 2 and 3
with the canopy cloth• Sleeve bushings
between moving components
• ½ diameter aluminum tubing
Detail Design
Canopy Upholstery
• Water resistant• Strong transparent vinyl
material• Attached by sections of
double sided high strength tape
Detail DesignLimit Switches and
Stops• Mechanical stops
control movement of rib 3
• Limit switches control movement of the whole assembly.
Ideas for the Future
• An emergency stop and a manual operation will be included.
• Canopy upholstery will be perforated to prevent a “sailing” effect during strong winds and to allow ventilation.
• Front section can be opened for better visibility.• The upholstery material will be changed to also provide
sun coverage. • The powertrain and control system will be housed to
reduce corrosion and increase safety.