Me463 Final Presentation 2

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  • 1. Karthik Kumar Sebastian Schillo Ben Baker Jessica Thompson Johannes Ruf
  • 2. 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 ME463 TEAM BASS DESIGN REVIEW 2
  • 3. 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 ME463 TEAM BASS DESIGN REVIEW 3
  • 4. All aluminum  frame Heavy-duty  lockable hinges Ergonomic  handle bars Reverse braking  mechanism An in-built belt  Telescopic legs  Latched gate  entry ME463 TEAM BASS DESIGN REVIEW 4
  • 5. Primarily for elderly and obese users  Weight capacity of 200kg  ◦ Tradeoff between weight and structure of the walker Requirements: Relatively light Strong brakes No slip/slide when stationary Increased protection against falling Provisions to carry IV equipment ME463 TEAM BASS DESIGN REVIEW 5
  • 6. 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 ME463 TEAM BASS DESIGN REVIEW 6
  • 7. 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 ME463 TEAM BASS DESIGN REVIEW 7
  • 8. ME463 TEAM BASS DESIGN REVIEW 8
  • 9. ME463 TEAM BASS DESIGN REVIEW 9
  • 10. Connection of  square aluminum pipe segments ◦ Inter-connections and leg connections via heavy duty hinges, lockable at 0˚ and 180˚ ME463 TEAM BASS DESIGN REVIEW 10
  • 11. Simple telescoping  design ◦ Pin connections set height ◦ Larger top portion for door attachment ◦ Easy attachment to caster wheels ME463 TEAM BASS DESIGN REVIEW 11
  • 12. 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 ME463 TEAM BASS DESIGN REVIEW 12
  • 13. 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 ME463 TEAM BASS DESIGN REVIEW 13
  • 14. Caster Wheels Handlebar   ME463 TEAM BASS DESIGN REVIEW 14
  • 15. 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 ME463 TEAM BASS DESIGN REVIEW 15
  • 16. ‣ 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 ME463 TEAM BASS DESIGN REVIEW 16
  • 17. 4” in diameter  and width 2”. Made of  polyurethane Excellent for  use on wet surfaces and grips well on hospital floors. ME463 TEAM BASS DESIGN REVIEW 17
  • 18. ‣Webbed PP Straps Connect to door o and side bar o Purpose to prevent or alleviate damage from falling ‣IV pole connection Screwed to front o leg o Hangs down or out ME463 TEAM BASS DESIGN REVIEW 18
  • 19. 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 ME463 TEAM BASS DESIGN REVIEW 19
  • 20. Buckling of Leg  Bending of Handlebar  Strength of Fall Protection  ME463 TEAM BASS DESIGN REVIEW 20
  • 21. F Fb = 17,528 lbs Fmax = 440 lbs SF = 39.84 ME463 TEAM BASS DESIGN REVIEW 21
  • 22. F σyield = 35,000 psi σ = 17,378 psi δmax = 0.37 in SF = 2.02 ME463 TEAM BASS DESIGN REVIEW 22
  • 23. σmax = 11,600 psi F σ = 698.27 psi SF = 16.61 ME463 TEAM BASS DESIGN REVIEW 23
  • 24. 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 ME463 TEAM BASS DESIGN REVIEW 24
  • 25. 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. ME463 TEAM BASS DESIGN REVIEW 25
  • 26. 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 ME463 TEAM BASS DESIGN REVIEW 26
  • 27. 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. ME463 TEAM BASS DESIGN REVIEW 27
  • 28. 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. ME463 TEAM BASS DESIGN REVIEW 28
  • 29. Mainly used material: 6061-T6  Aluminum alloy with magnesium & silicon  Some properties:  Min. yield strength 35000psi (241MPa)  Max. tensile strength 42000psi (290MPa)  ME463 TEAM BASS DESIGN REVIEW 29
  • 30. 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 ME463 TEAM BASS DESIGN REVIEW 30
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  • 32. ME463 TEAM BASS DESIGN REVIEW 32