me463 final presentation 2
TRANSCRIPT
TEAM BASS – Preliminary Design Review
Karthik KumarSebastian Schillo
Ben BakerJessica Thompson
Johannes Ruf
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Introduction Product Profile
◦ Problem Definition◦ Concept: Product Functions and Features◦ User Profile
Engineering Analysis◦ Walker Dimensioning and Parts◦ Modeling◦ Justification◦ Risk Assessment
Future Activities◦ Gantt Chart
Overview
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To design and construct a bariatric walker that will aid or assist those weak of strength or balance to walk in a safe and convenient manner.
Provide support to obese or elderly Carry additional medical items Ensure safety
Problem Definition
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All aluminum frame
Heavy-duty lockable hinges
Ergonomic handle bars
Reverse braking mechanism
An in-built belt Telescopic legs Latched gate
entry
The Concept - Walker
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Primarily for elderly and obese users Weight capacity of 200kg
◦ Tradeoff between weight and structure of the walker
Requirements:Relatively lightStrong brakesNo slip/slide when stationaryIncreased protection against fallingProvisions to carry IV equipment
User Profile
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Introduction Product Profile
◦ Problem Definition◦ Concept: Product Functions and Features◦ User Profile
Engineering Analysis◦ Walker Dimensioning and Parts◦ Modeling◦ Justification◦ Risk Assessment
Future Activities◦ Gantt Chart
Overview
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The primary features of the walker are:◦ Adjustable height for convenience to users◦ Foldable length for efficient storage◦ Spring loaded door for entry and automatic
closing behind user◦ Straps attaching to side walls, serving as fall
protection◦ Default-locked hand brakes to ensure walker is
stationary while entering and until user ready for motion
Concept: Functions and Features
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Full device, Extended for use
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Connection of square aluminum pipe segments◦ Inter-connections
and leg connections via heavy duty hinges, lockable at 0˚ and 180˚
Components: Side Bars
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Simple telescoping design◦ Pin connections set
height◦ Larger top portion for
door attachment◦ Easy attachment to
caster wheels
Components: Legs
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Torsion spring connection to legs◦ Allows user to only
have to open door to enter, as door will automatically close behind user.
◦ Contains hooked connection to support straps
Components: Door
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Introduction Product Profile
◦ Problem Definition◦ Concept: Product Functions and Features◦ User Profile
Engineering Analysis◦ Walker Dimensioning and Parts
Braking◦ Modeling◦ Justification◦ Risk Assessment
Future Activities◦ Gantt Chart
Overview
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Components of braking system
Caster Wheels Handlebar
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Handlebar Push down the
handlebar to unlock the brakes.◦ Brakes locked
automatically to guarantee that walker will not slip.
◦ Provides high stability for patient while entering walker
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Interface to frame‣Interface to the frame is held by bolts.
‣Slide bearings reduce friction while moving.
‣Torsion spring provides resistance against pushing down and is used to unlock the brakes.
‣Integration of functions can be reduced at the cost of a higher complexity of the part
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4” in diameter and width 2”.
Made of polyurethane
Excellent for use on wet surfaces and grips well on hospital floors.
Caster Wheels
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Components: Additional
‣IV pole connectiono Screwed to front lego Hangs down or out
‣Webbed PP Strapso Connect to door and side baro Purpose to prevent or alleviate damage from falling
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Introduction Product Profile
◦ Problem Definition◦ Concept: Product Functions and Features◦ User Profile
Engineering Analysis◦ Walker Dimensioning and Parts◦ Modeling◦ Justification◦ Risk Assessment
Future Activities◦ Gantt Chart
Overview
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Modeling & Analysis Buckling of Leg Bending of Handlebar Strength of Fall Protection
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BucklingF
Fb = 17,528 lbs
Fmax = 440 lbs
SF = 39.84
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BendingF
σyield = 35,000 psi
σ = 17,378 psi
SF = 2.02
δmax = 0.37 in
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Fall Protection
Fσmax = 11,600 psi
σ = 698.27 psi
SF = 16.61
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Introduction Product Profile
◦ Problem Definition◦ Concept: Product Functions and Features◦ User Profile
Engineering Analysis◦ Walker Dimensioning and Parts◦ Modeling◦ Justification◦ Risk Assessment
Future Activities◦ Gantt Chart
Overview
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Some existing products offer: Foldability Intelligent braking system Interfaces to commonly used medical
devices Fall protection
This product offers all of the above with special emphasis on safety.◦ Increases range of users.
Product Justification
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Walker intended to support, while standing or moving, human bodies that may be particularly frail and may have otherwise needed wheelchairs.
Thus, points of highest risk are:◦ Falling◦ Entering walker
The product has been designed primarily with these risks in mind
Risk Assessment
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Only when falling will the walker need to support the entire weight of the user. ◦ Provide as much safety as possible without
reducing functionality. ◦ Belt installment can significantly prevent or lower
the consequence of most falls.◦ Plan B: Place belt through the legs to improve
front fall protection. Not implemented, as would reduce functionality Handlebar designed in such a way to reduce
likelihood of front tipping, as force applied downwards and well within base area.
Falling
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Users of the walkers are inherently potentially weak or fragile.◦ While standing, users often try to lean on walker as
a support. Wheels are default-locked.
◦ Provides stable support while entering. Walker is back-entry with torsion spring door.
◦ Allows users to entry directly into back from a chair.◦ User does not have to turn around to close and lock
door.
Entering
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Mainly used material: 6061-T6 Aluminum alloy with magnesium & silicon
Some properties: Min. yield strength 35000psi (241MPa) Max. tensile strength 42000psi (290MPa)
Material of the frame
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Introduction Product Profile
◦ Problem Definition◦ Concept: Product Functions and Features◦ User Profile
Engineering Analysis◦ Walker Dimensioning and Parts◦ Modeling◦ Justification◦ Risk Assessment
Future Activities◦ Gantt Chart
Overview
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Project Progress
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Questions?