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P14006 Bath Tub Lift Phase V Review Amos Baptiste Jeremy Czeczulin Andrew Hughes Richard Prilenski
Introductions
Name Major/Role
Amos Baptiste Industrial & Systems Engineer/Team Leader
Jeremy Czeczulin Mechanical Engineer
Andrew Hughes Mechanical Engineer
Richard Prilenski Mechanical Engineer
Agenda
• Phase IV Overview
• Problem Definition
• Action Items
• Refined Drawings
• Prototype
• Materials
• Actuator and System
• Stress Analysis
• Customer/Engineering Requirement
• Risk Assessment
• MSD II Plan
• Questions
Problem Statement
• Bathtub lift – a device that provides assistance to an individual with physical disabilities, including limited balance, coordination, or mobility
• Can reduce the difficulties of raising and/or lowering an individual into the tub by utilizing a powered seat and a simple control module
• As population grows the number of aged individuals will greatly increase making demand for assist devices increase
• Project motivation – Theresa Loce
• Improve the current design
• Current device does not meet her needs
• Powered lift that is sturdy, comfortable, easy to use/clean, makes minimal noise, and takes into account physical limitations of user
• Ultimate goal – user maintains autonomy and privacy
Deliverables
• Effectively assist the user for bathing purposes
• Device is easy to access from starting position
• Minimized operating time
• Provide a comfortable and supportive seating area
• Accessible to 10th-70th percentile for both genders, regardless of age
• Reasonably lightweight and portable, able to be transported
Current and Desired State
Current
• Unstable
• Out of production
• Damaged
• Difficult access
• Obstructions prevent full use
Desired
• Easy use
• Easy access
• Portable
• Lightweight
Stakeholder(s)
• Primary Customer: Theresa Loce
• Contact: 585-647-2329
• Secondary Customer (s): Wheel chair users/handicap public & Elizabeth DeBartalo, Hospitals (RGH), Nursing Homes, suppliers/vendors, individuals recovering from knee surgeries, Linak, & Acrylix.
• Contact: [email protected]
• Faculty Guide: Art North
• Contact: [email protected]
• Sponsor (financial support): RIT & Theresa Loce
Issues to Address from Phase IV • Include actuator on CAD design
• Free body diagram of the Actuator
• Putting locking mechanism for rotation and lateral movement
• Make controller longer and wider
• Limitations of actuator
• Reorganize risk assessment to importance & severity ratings
Action Items from Phase IV Action Item Owner Issue(s) to Address
Include actuator in the CAD design and perform FBD
Andrew & Jeremy • Stresses on the actuator • Length of the rod needed to ensure
seat about bath tub
Refine a design and prototype for controller
Amos & Jeremy • Controller being too small having ability to slip out of hand.
Refine CAD design Andrew • Ensure the chair fits the target percentile
• Determine location of bearing and pins
• Locking mechanism
Conduct stress analysis Richard • Stress from bending with materials chosen
• Stresses on pins and bearings
Refine BOM Amos • Ensure material is waterproof and is strong for safety reasons.
Contact Linak Sales Manager Jeremy • Specific model code of actuator to order
• Limitation of actuator
Function Diagram
User uses controller
Actuator Scissor lift rises
Chair rises to maximum height
User turns the seat and sits on it
Pull lever to lift pin to slide chair
laterally
User uses controller Actuator Scissor lift lowersChair lowers to
minimum height
Pull lever to lift pin to rotate chair on
bearing.
Pull lever to lift pin to rotate chair on
bearing.
Pull lever to lift pin to slide chair
laterally
Pin must lock
Pin must lock
Remove Case from Actuator
Remove battery and plug It into the wall mounted charger
Remove battery from charger and
place back into acutator
Seal actuator in case
4 hrs
Continued
Continued
Continued
Continued
Continued
Prototype
Controller • Consist of:
• Power button
• Directional pads to move the chair
• Home button
HB60 Handset
IPX Ratings
LA31 Careline Linear Actuator
• Provided by Linak
• 6,000N (1350lb) max push, 4,000N (900lb) pull
• IPX6 protection class
• Emergency lowering/retraction
• 24V DC magnet motor, 2.25m cable
• Custom stroke length
BAJ1 Battery Pack
• Compact design
• 40 lifts per charge
• 4hr charge time
• Low battery indicator
• Up to 6000N thrust
• IPX5 Protection
CHJ2 Wall Charger
• Charges in 4 hrs
• Indicator light for charging status
• Compact
• IPX5 rating
MBJ & MBJ2 Mounts
• Mounting brackets for controller and charger (2)
MBJ
MBJ2
CBJ2 Control box
• Combines actuator, controls, battery, and charger into one system
• Central hub
• IPX5 rating
• 7 different parts overall
Materials Material Name Weight (per cc^3) Elastic Modulus(ksi) Tensile Strength (Psi) Shear Strength (psi) Corrosive?
1 Fiberglass 2.49 20500 No
2 Gel coated Fiber Glass 2.49 20500 No
3 Acryllic Optic Grade 1.2 5510-13000 No
4 Polyamides
5
Material Name Weight (per cc^3) Elastic Modulus(ksi) Tensile Strength (Psi) Shear Strength (psi) Corrosive?
1 Carbon fiber 1.6 15954 No
2 Aluminum 2.69 40000 No
3 Acryllic Optic Grade 1.2 5510-13000 No
4
5
Material Name Weight (per cc^3) Elastic Modulus(ksi) Tensile Strength (Psi) Shear Strength (psi) Corrosive?
1 Fiberglass 2.49 20500 No
2 Carbon Fiber 1.6 15954 No
3 4140 Carbon Alloy Steel (Annealed) 7.85 60200 No
4 Polyurethane Alloy 0.970-1.40 1740-9720 4930-7690
5 Acryllic Optic Grade 1.2 5510-13000 No
Material Name Weight (per cc^3) Elastic Modulus(ksi) Tensile Strength (Psi) Shear Strength (psi) Corrosive?
1 A36 Steel 7.85 36300 Yes
2 4140 Carbon Alloy Steel (Annealed) 7.85 60200 No
3 Stainless Steel 0.19-9.01 11200-46000 6150-348000 No
4 Medium Carbon Steel 7.75 65300-396000 No
5 Acryllic Optic Grade 1.2 5510-13000 No
Chair (Seating Material)
Chair (Frame)
Base (excluding steel fixture for extendable pillar and sunction cups)
Scissor Legs
Materials
Material Name Weight (per cc^3) Elastic Modulus(ksi) Tensile Strength (Psi) Shear Strength (psi) Corrosive?
1 Gel Coated Fiber Glass 2.49 20500 No
2 Polyamides
3 Acryllic Optic Grade 1.2 5510-13000 No
4
5
Material Name Weight (per cc^3) Elastic Modulus(ksi) Tensile Strength (Psi) Shear Strength (psi) Corrosive?
1 A36 Steel 7.85 36300 Yes
2 4140 Carbon Alloy Steel (Annealed) 7.85 60200 No
3 Stainless Steel 0.19-9.01 11200-46000 6150-348000 No
4 Medium Carbon Steel 7.75 65300-396000 No
5 Acryllic Optic Grade 1.2 5510-13000 No
Arm Rest
Extendable Arm
Actuator $ 500.00
Total $ 1,357.00
Total with 30% increase $ 1,764.10
Amount Left with 30% increase $ 1,264.10
Material Layout Acrylic Plastic Optical Grade
Color: Beige
Acrylic Plastic Optical Grade
Track: Acrylic plastic Optical GradeRollers: Steel
Acrylic Plastic Optical Grade
Acrylic Plastic Optical Grade
Color: White
Medium Carbon Steel
LA 31 ActuatorColor: Black
Industrial Suction Cups
Acrylic Plastic Optical Grade
Acrylic Optical Grade
Acrylic Plastic Optical Grade
Medium Carbon Steel
Pin: Medium Carbon Steel
Medium Carbon Steel
Waterproof memory foam padding
Stress Analysis
Stress Analysis – Zoomed in
Recorded stress values are 6.7 – 15.2 ksi. The limit for acrylic is 10 ksi. Therefore the scissor supports will be thickened.
Displacement (in)
Factor of Safety
Recorded values ranged from 1.9 – 5 where appropriate
Updated Customer Requirements
Updated Engineering Requirements
Updated Engineering Matrix
Risk Assessment
ID Risk Item Cause Effect Likelihood Severity Importance Actions to Minimize Owner
1Actuator being
damaged
Water getting inside
while the actuator
extends and retracts
Actuator lifespan decreasing and being
damaged2 3 6
Apply a protective
housing that can
extend and retract with
the actuator
Team
2
Electric power
supply
inconsistent
Charge from battery
may not be sufficient to
operate device when
running low
User may experience longer operation
times or may become trapped in tub2 3 6
Apply a warning
system/visual indicator
that the battery is low.
Team
3 Fixture dimensions
Measurement errors of
the bath tub and the
device. Not considering
thickness of materials
in specs.
Device not able to fit in the tub.
Customer not being able to use the
device.
2 3 6
Have multiple team
members measure the
dimension of the tub
and for every step of
the process, re-
measure to verify
meeting constraints
Team
4
User hand getting
injured in the
process of using
the seat
Exposed folding
mechanism and/or seat
lowering to quickly
Hand chopped off 2 3 6
Ensure through the
proof of concept the
device will not lower
quickly or collapse. In
addition, make a safe
folding mechanism.
Team
5
Not being able to
meet
deadlines/milesto
nes
Not having a well
developed project plan
and keeping it updated
Product delay which may lost
customers trust 2 2 4
Have daily or weekly
updates on
assignments and if help
is needed
Team
6
Not being able to
fulfill requirements
of broad user base
(height/weight
differences)
Not conducting an
ergonomics study on
the stature of the users
percentile and their
reach
User may be too big or too small for
device. User may get injured due to lack
of space or not being able to reach
certain items. Customer dissatisfaction
2 2 4
Conducting ergonomic
experiments on the
target percentile range
Amos
Risk Assessment
7
User injury due to
falling/slipping off
device
No adding arm rails.
Combination of
material, water and
human skin not having
enough friction causing
user to slip.
Minor to severe injury to the
customer/user1 3 3
Implement a safety
device and use high
friction materials
Team
8 Shocking the userExposed electrical
components
User may be shocked by direct contact
with device or through water1 3 3
Design electrical
components to be
isolated/sealed from
rest of device.
Team
9Device weight
capacity
Device not able to lift
well over the minimum
requirement
Device fails under heavy loading,
trapping and possibly injuring user1 3 3
Through testing device
must lift >150 lbsTeam
10Safety of user’s
legs
When fixture is
lowering it does not
allow enough room for
legs
Minor to sever injury to the
customer/users legs 1 3 3
Apply a foot rest at the
base of the device so
the user can place their
feet before operating
Team
11
Transfer from
starting position to
the device
Unsafe transition from
starting position to the
device
Possible falling injury 1 3 3
Option1: Having the
device being able to
slide out the tub for the
user to access. Option
2: Ensure that the
device can rotate out of
the tub and is stable for
users that can stand to
use as a support.
Team
12Device tipping
over
Sunction cup failure or
the device not properly
secured to the base of
the tub.
Minor to sever injury to the customer 1 3 3
Reinforce sunction cup
base and have a back
up plan in the case the
sunction cups fail.
Team
13
All team members
not being able to
meet
Miscommunication or
lack of communication
between team
members
Team members missing meetings or
not being active in their roles2 1 2
Communicate with
team verbal and
text/email when and
where will meetings
will take place.
Amos
14 Going over budget
Not keeping track of
budget or knowing
what the budget is
Having to ask for more or falling short
on supplies to develop the product. 1 1 1
Schedule to audit
budget every 2 weeks. Team
Company Bathmaster Sonaris Bellavita Orca Portable Water Power P14006
Type Battery Battery Battery Hydraulic Battery
Number of Lifts 8 to 10 N/A 12 Infinite 40
Time to charge 3 hours N/A 6 hours 0 hours <= 4 hours
Weight Capacity 308 lbs 300 lbs 400 lbs 200 lbs 350 lbs
Weight of device 15.75 lbs 20.5 lbs 35 lbs 19 lbs 20-30 lbs
Arm rest No No No Yes Yes
Portable Yes Yes Yes Yes Yes
Recline angle 40 degrees 50 degrees 0 degrees 0 degrees 40-90 degrees
Rotate angle 0 degrees 0 degrees 0 degrees 360 degrees >=180 degrees
Lifting Height 3"-18" 2.3"-18.8" 17" 2"-21" 17"
Back rest dimensions 24" x 14" 25.1" H x12.5"-14.1"W 26" x 27" 15" x 15" 15" x 15"
Seat dimensions 20" x 15"; 27" with flaps 22.4"L x 12.7"W;27.5" with flaps 14.75"W x 19"D N/A 15"L x 13W"
Plan for MSD II
Questions?
