undergraduate design team charles stepaniuk hugo i. gallegos daniel totong [email protected]...

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Undergraduate Design Team Charles Stepaniuk Hugo I. Gallegos Daniel Totong [email protected] Automatic Retractable Wheelchair Canopy International Design Engineering Technical Conferen September 5, 2007

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Undergraduate Design Team Charles Stepaniuk

Hugo I. Gallegos Daniel Totong

[email protected]

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.

Questions?

Thank You

Thank you to….– Professor Fu-Pen Chiang for always taking the

time to provide guidance.– Professor Yu Zhou for going above and beyond

to help. – Lester Orlick and George Luhrs for the uncanny

manufacturing advise.– The Entire Mechanical Engineering Department

at Stony Brook University