LOAD TRIGGERED WALKER

MECH 447 - Senior Design Capstone Project

Prepared for:William Bill DickInstructor of Mechanical EngineeringUniversity of Nebraska-Lincoln

By:Rao, Manu VengetaKathirasen, KathirguganKong, LiranZhang, Dingwei

LOAD-TRIGGERED WALKER

OverviewObjectiveBackground Design Overall - Retractable Pen Mechanism - Arc Mechanism - PortabilityForce AnalysisCost

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 mechanismBackground

Duro-Med 2-Button Adjustable Aluminum Folding Walker ($45.99)

NOVA "GetGo" 4203 Rolling Walker ($99.99)Design

The Arc Mechanism

ForceAngle()F-Tube2211lb2914lb3617lb4320lb5022lb5725lb* 20lb to disengage the magnetMobility

Mobility

Step 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 foldedMobility

Step 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 paddingMobility

Step 3: The walker is folded and the user can hold the strap to move the walkerMobility

Design for Manufacture

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