Prepared for William Bill Dick Instructor of Mechanical Engineering University of NebraskaLincoln By Rao Manu Vengeta Kathirasen Kathirgugan Kong Liran Zhang Dingwei LOADTRIGGERED WALKER ID: 267515
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MECH 447 - Senior Design Capstone ProjectPrepared for:William Bill DickInstructor of Mechanical EngineeringUniversity of Nebraska-LincolnBy:Rao, Manu VengetaKathirasen, KathirguganKong, LiranZhang, Dingwei
LOAD-TRIGGERED WALKERSlide2
OverviewObjectiveBackground Design – Overall - Retractable Pen Mechanism - Arc Mechanism - PortabilityForce AnalysisCostSlide3
ObjectiveMadonna Rehabilitation Hospital identified need for load-triggered mechanism – accidentally slipseliminate the need for person using the walker to use hand-triggered brake or any other type of manual braking mechanismMajor considerations : 1) need for mobility 2) need for effective fall prevention mechanismSlide4
BackgroundDuro-Med 2-Button Adjustable Aluminum Folding Walker ($45.99)NOVA "GetGo" 4203 Rolling Walker ($99.99)Slide5
DesignSlide6
The Arc MechanismForce
Angle(°)
F-Tube
22
11lb
29
14lb
36
17lb
43
20lb
50
22lb
57
25lb
* 20lb to disengage the magnetSlide7
MobilitySlide8
MobilityStep 1: Pull out the pins and disengage the brake tube and the rotating bar.
Shows the pin mechanism that if pulled in the direction shown, would disengage and allow the walker to be foldedSlide9
MobilityStep 2: Disengage the Velcro strap to the horizontal bar, and push the tube and bar downwards.
Shows the handle that is attached to the upper horizontal bar which has Velcro paddingSlide10
MobilityStep 3: The walker is folded and the user can hold the strap to move the walkerSlide11
MobilitySlide12
Design for ManufactureSlide13
Costcam-ratchet mechanism = $ 62.70walker = $ 222.58Production costs (SAE guidelines) - cam-ratchet mechanism = $ 9.07 - walker amounted to = $ 56.65 total cost = $ 422.77addition of overhead costs, bureaucracy, additional modification and profits = market value of $ 800