design of a multi-purpose · outline of project activity and detailed design hydraulic lifting...
TRANSCRIPT
Design of a Multi-Purpose
Chair Lift
Brad Dalrymple
Brent Paradis
Justin Noseworthy
Trevor MacNeil
Final Presentation
March 31st, 2015
Agenda
Design of a Multi-Purpose Chair Lift – Final Presentation – March 31st, 2015
Introduction
Review of Design Problem and Alternative Selection
Outline of Project Activity and Detailed Design
Identification of Constraints
Further Analysis
Recommendations and Conclusions
Introduction
PROJECT PURPOSE
Modify the existing patient transfer unit
Complete prototype by end of semester
Analyze alternate height adjusting systems, time permitting
PROJECT SCOPE
Modify existing unit to be height adjustable
Conduct Finite Element Analysis to verify structural integrity
Physically test initial prototype
Design of a Multi-Purpose Chair Lift – Final Presentation – March 31st, 2015
Introduction
EXPECTED OUTCOMES
Completed product will be capable of lifting
patients into beds of varying height
PROJECT DELIVERABLES
Interim Report and Presentation
Final Report and Presentation
Web Site
Log Books
Initial Prototype
Design of a Multi-Purpose Chair Lift – Final Presentation – March 31st, 2015
Review of Design Problem and
Alternative Selection
Design Problem
Modify existing patient transfer unit to move up to 6” in
the vertical direction
A single supporting member instead of two
Support a minimum of 500lbs
No electrical components
Design of a Multi-Purpose Chair Lift – Final Presentation – March 31st, 2015
Review of Design Problem and
Alternative Selection
Why is it better than other lifts?
Height adjustable to fit all hospital beds
Other lifts are often immobile
Ease of operation
No need for electronic components
Simple to construct
Design of a Multi-Purpose Chair Lift – Final Presentation – March 31st, 2015
Review of Design Problem and
Alternative Selection
Chosen Solution
Hydraulic lifting method
Bolted connection
Foot pump (modified hand pump)
Telescopic joint
Aluminum box beam
Design of a Multi-Purpose Chair Lift – Final Presentation – March 31st, 2015
Outline of Project Activity and
Detailed Design
Cylinder Sizing
Free Body Diagrams
Design of a Multi-Purpose Chair Lift – Final Presentation – March 31st, 2015
Outline of Project Activity and
Detailed Design
Cylinder Sizing
Bending Stress
Design of a Multi-Purpose Chair Lift – Final Presentation – March 31st, 2015
Cylinder Sizing
Deflection
22” 6”
Outline of Project Activity and
Detailed Design
Aluminum Box Beam
Manufactured by Tech Services
Design of a Multi-Purpose Chair Lift – Final Presentation – March 31st, 2015
Material Aluminum
Size 5” x 5”
Height 22”
Thickness ¼ “
Outline of Project Activity and
Detailed Design
Inner Tube
Manufactured by Tech Services
Design of a Multi-Purpose Chair Lift – Final Presentation – March 31st, 2015
Material Aluminum
Size 4” x 4”
Height 18”
Thickness ¼ “
Outline of Project Activity and
Detailed Design
Hydraulic Lifting Method
10 Ton Hydraulic Porta-Power Ram
Design of a Multi-Purpose Chair Lift – Final Presentation – March 31st, 2015
Material All Steel
Type Hydraulic Porta-Power Ram
Capacity 10 tons
Closed Height 13-3/4 in.
Extended Height 19-3/4 in.
Stroke 6 in.
Pressure Rating 8,900 PSI
Outline of Project Activity and
Detailed Design
Hydraulic Lifting Method
4 Ton Hydraulic Porta-Power Hand Pump
Design of a Multi-Purpose Chair Lift – Final Presentation – March 31st, 2015
Material All Steel
Type Hydraulic Porta-Power
Hand Pump
Maximum
Applied Force 4 tons
Oil/Water
Capacity 20 cu. in
Outline of Project Activity and
Detailed Design
Pushing Plate
Manufactured by Tech Services
Design of a Multi-Purpose Chair Lift – Final Presentation – March 31st, 2015
Material Steel
Size 4.5” x 4.5”
Total Height 1-3/4”
Thickness ¼”
Inside Tube
Radius 1.3”
Outline of Project Activity and
Detailed Design
Sliding Mechanism
Self-Lubricating UHMW Polyethylene Sheet
Design of a Multi-Purpose Chair Lift – Final Presentation – March 31st, 2015
Thickness ¼”
Thickness Tolerance ± 0.030”
Tensile Strength Good
Impact Strength Excellent
Sheet Size 12” x 24”
Identification of Constraints
Economic
$250 budget assigned by the Faculty
$225 spent on parts and labour:
Hydraulic Cylinder: $95
Hose and Fittings: $30
Mechanical Pump: $75
Technical Services: Supplied by Dr. Hinchey
Design of a Multi-Purpose Chair Lift – Final Presentation – March 31st, 2015
Identification of Constraints
Environmental
As this is a fully mechanical system with no electronic components or emissions it will
be 100% environmentally friendly. All aluminum parts were recycled
Water as the working fluid
Safety
Safety is the number one concern for this project
All components are designed with safety in mind and can support over 500lbs
Design of a Multi-Purpose Chair Lift – Final Presentation – March 31st, 2015
Further Analysis
Finite Element Analysis
Analysis completed using SolidWorks
Total Loaded Deflection: 0.31 mm
Max Load: 1500 lbs
Design of a Multi-Purpose Chair Lift – Final Presentation – March 31st, 2015
Recommendations and
Conclusions
Recommendations
Physical testing of completed unit
Add lever for release valve
Increase R&D budget
Optimize for minimum manufacturing cost
Improve chair ergonomics
Increase aesthetic appeal
Design of a Multi-Purpose Chair Lift – Final Presentation – March 31st, 2015
Recommendations and
Conclusions
Design of a Multi-Purpose Chair Lift – Final Presentation – March 31st, 2015
