Jib Transfer Bench – P /11/2012

 Problem Definition  Customer Needs / Specifications  Functional Decomposition  Benchmarks  First CAD Design  Concept Generation  Selection Criteria Matrix  Preliminary Calculations  Budget Estimate  Project Plan

 Task is to design a mechanical solution to move a disabled jib trimmer from side to side so they can perform their crew function

SEE METRICS CHART

 Gary & Zak ◦ No leg mobility / core support ◦ Desires to be fully secured  Cindy ◦ Partial leg & core strength ◦ Desires freedom to exit seat ◦ Limited footprint available due to Richard’s chair  Height differences to consider

 Must be able to translate AND rotate independent of each other (i.e. not fixed)

Platform Top Travel Bars Bottom Travel Bar Traveler Seat Bracket Seat Support Bar

 Handhold mechanisms on the previous team’s captain’s chair

 We plan to use something similar to secure our device to the front handholds to the boat

 Brainstormed ideas for each main component of our assembly: ◦ Seat ◦ Method of motion (translation and rotation) ◦ Method of propulsion ◦ Harness ◦ Locking mechanism  All must fall within our size constraints for Richard’s boat and without extending into the other team’s footprint

 Concept: Chair that can rotate on a pair of rails spanning the boat  Problem: With full 180° rotation, legs will smack

 “Seat-Within-A-Seat” initial sketch ◦ Swivel chair on rails that span the boat One bar w/ bottom support Two bar w/o support

 Telescoping arm anchored on the boat floor (platform) ◦ Seat mounted on top of arm

 Jib trimmers with limited core strength ◦ Propel themselves linearly ◦ Rotate themselves ◦ No electrical solution, 100% mechanical

 Settled on a purchase system ◦ Pulley system that will allow the user to pull themselves with a mechanical advantage

 Currently, not settled on a specific lock. ◦ Fence lock, pin lock, friction plate ◦ Cleating purchase system lines to lock chair  Check prices  Check compatibility of what we want to do

 Must support jib trimmer’s ◦ Torso ◦ Legs  Should have capability to accept and secure a user’s wheelchair cushion should they wish to use it.

 Lazy Susan design

 Swivel Stool Go-Kart Seat Racecar Seat

 5-point harness  Secured Double-Velcro vest  Lap Belt

Compiled all ideas, determined the best:  “Seat-Within-A-Seat” Chair  Harness or double-Velcro vest  Purchase system for motion  Undetermined locking mechanism  See Excel file

ComponentZak & GaryCindy Seat Go-Kart SeatSwivel Stool Torso Securing Mechanism 3/5 point HarnessLap Belt or Velcro Leg Support Wheelchair Footrestnone Method of Movement SWIAS 3-bar BB&B Movement Force 3-1 Purchase system Locking Mechanism Friction Brake & Cleats  Two separate systems based on individual customer needs

 Go-Kart Seat

 Stool

 Calculations to prove the design:  Using aluminum traveler bars  Box tube deflection – 7075 Aluminum ◦ Weight sitting on ◦ Deflection: inches ◦ Shears at 19.9°  Box tube shear strength  Looking at smaller, cheaper, lighter materials

 Assuming 260-lb human

 Drop platform onto floor  Lock into first handhold (using similar locking device from Gold Medal Chair)  Jib trimmer sits in chair and straps in  Sail away!

 Based on the Gold Medal Chair: ◦ $1,658  Based on research of components that we are looking at: ◦ $2,000

 Continue with design phase  CAD Modeling  Create Bill of Materials  Prove Design  Detailed Design Review in 3-5 weeks  Order parts  Build, install, sail!