1. Tub Lift Rev. 2
Dom
Group 16006

2. Agenda The Team Project Background Project Statements Use Scenarios
Interview Questions
Customer Requirements
Engineering Requirements
House of Quality
Benchmarking
Draft of Project Plan
Dom

3. The 16006 Team Team Member Alex Branch Dom Hall Alex Krall
Jake Swearingen
Major
Mechanical Engineering
Industrial and Systems Engineering
Special Roles
Primary Designer and Tester
Vendor Liaison,
Customer Liaison,
Technical Writer
Project Manager
Everyone

4. Project Background
Water powered bath lifts are mainly used by individuals with limited balance, coordination, or mobility of their body (especially lower extremities)
The lifts help them enter and exit a bathtub, as well as lower themselves into the water.
These systems are easy to use, affordable, and were once the standard in bathtub lifts.  
As newer battery-powered systems have become more common, it is getting more difficult to repair or replace water- powered lifts.
The customer for this project is a wheelchair user who relies on this type of assistive device in order to maintain autonomy and privacy.
Dom

5. Previous Design Prototype is not completely functional
Impractically heavy
Does not meet current customer requirements
Alex b

6. Project Statement
Theresa, a wheelchair user relies on a hydraulic power bath lift to assist her with entering and exiting her bath tub. Theresa has suffered from polio in the past and is gradually losing movement in her extremities as a result. The water-powered lift that she currently utilizes has been requiring frequent repairs due to its age (parts are becoming scarce, expensive and possibly unreliable). Development of a new, affordable and easy-to-use lift mechanism for her bath tub is desired. The final mechanism must be able to both lower, lift and rotate Theresa into and out of her tub in a timely manner, while taking into consideration the strict spatial constraints of her bathroom. An ergonomic and safe design is preferred.
Dom

7. Use Scenarios
Alex B.

8. Interview Questions How permanent can this project be?
How can this system be powered?
What materials can be used?
What is the biggest issues with the current set up?
Are there any other specific requirements for this project?
How is the current system used?
How would you ideally like to get into the tub?
Jake

9. Customer Requirements
Keep electronics and water separate
Chair must swivel
Unit cannot be permanent (can be removed)
Similar functionality to current unit
Equal or smaller size than current unit
Comfortable seat
Unit must be sanitary and durable in water
Chair can recline
Jake

10. Engineering Requirements
Jake

11. House of Quality Critical Engineering Requirements: Overall Weight
Rotation of Seat
Distance to Bottom of Tub
Footprint of Lift
Sustainable Maximum Weight
Alex K.

12. Benchmarking 20.5 300 2.3 - 18.9 50 24.5 265 2.3 - 17 10 (fixed) 28.9
Product
Unit Weight
(lbs)
Capacity
Vertical Adj.
(in)
Recline
(deg)
Qty. Assembly Parts
Cost
Bellavita Auto Bath Lift (
20.5
300 50 2
$565
Drive Whisper Auto Bath Lift (
$499
Riva Bath Lift (
24.5
265
10 (fixed) 4
$699
AquaJoy Premier Bath Lift (
28.9
375
130
----
$700
**Portable Bath Lift (
19.0
200
2 - 21 1
$1400
Alex B.
**: Discontinued Product (Price is not accurate)

13. Risk Management Risk Severity Likelihood Reduction Mechanical Failure3
Include Appropriate Factor of Safety
Falling off of Lift 9
Include Safety Instructions and Incorporate Handles
Electrical Hazard
Minimize or Eliminate Electrical Components in Contact with Water
Tangling of Hoses
Appropriate Cable Management
Alex K. - ISO :2006, Safe machine design

14. Project Plan (Next 3 Weeks)
Develop method of swiveling tub lift chair
Determine the method of lifting/lowering tub lift operator
Choose the best overall design
Determine materials needed for the components of the lift
Analyze design using mechanics
Create a Bill of Materials
Alex K.

15. Project Plan (MSD 1)
Ambition since this is the project’s second iteration:
Have a solid, realistic design ready to go
Begin finding vendors and order parts
Once parts have arrived, being assembly of our prototype
Test functions and incrementally improve design even further
Alex K.

16. Questions?