P13031 - Jib Transfer Bench

Team Members: Mike Walsh, Nick Davis, Charley Kowalyshyn, Zeb Koch

Guides: Kate Leipold, Dr. DeBartolo

Project Motivation: To provide an expanded and enhanced

sailing experience for sailors with varying disabilities

Project Goal: To design a mechanical solution to move a

jib trimmer from side to side on a Sonar class sailboat, allowing them to function as a member of the crew.

Project Description

Concept heavily influenced by space constraint required due to Captain’s Chair ◦ 23” front to back available◦ Cantilevered design fit best in

space constraint Rotational and translational

movement required for jib trimmer

Concept Summary

Gary & Zak◦ No leg mobility / core support◦ Desires to be fully secured

Cindy◦ Partial leg & core strength◦ Desires freedom to exit seat when necessary◦ Limited footprint available due to P13032’s chair

Cindy needs the option to sail with Gold Medal Chair or as a standalone device

Customer Needs Recap

Two systems were to be built, requiring a comprehensive design to fit varying needs

Cantilevered seat – most viable option to fulfill needs at expense of weight, time and money

Design Summary

Main components: ◦ Baseplate platform ◦ Side seat platforms◦ Bench◦ Lazy susan◦ Seat◦ Purchase system ◦ Handholds

Points of contact with the boat are:◦ Baseplate, side seat platforms, handholds,

purchase system

System Architecture

Modeled on previous baseplate

Legs are bolted through metal plate underneath

Base clamps to bilge cover

Allows adjustability – forward and backward

Baseplate

Protects boat from interference with jib transfer bench

Provides surface to distribute any forces from system

Parts of purchase system mounted to these platforms

Side Seat Platforms

Pillow block and carriage provide linear motion on bar and track

Most expensive component in system

Heaviest component Most complex to

install

Bench

Durable lazy susan◦ Greased bearings◦ Rigid against torque

Provides enough friction for braking, but allows easy rotation too

Lazy Susan and Seat

Provide adjustability to any Sonar handhold◦ Slides along 80/20 in X-

Direction◦ 80/20 design allows for

rotation to perfect angle◦ Slots in plates allow for

extension into handhold cups

◦ Turnbuckle gives max adjustability and security

Handholds

Mounted behind occupant. Travels the width of device

Designed to give a 3-1 advantage

Purchase System

Purchase System

Top of swivel stool used

Lap belt for support

Cindy’s System w/o Captain’s Chair

System moved forward on baseplate with front handhold used

Limits space for Cindy to move

Cindy’s System w/ Captain’s Chair

Bucket seat and 5-point harness provide support

Leg supports

Zak & Gary’s System

Test #

Metric Marginal Target

Technical Target

Test Result Pass/Fail?

1 Device Weight 100 lbs 50 lbs 125 lbs Fail2 Transfer Time 5 sec 3 sec 2.9 sec Pass3 Vertical

Translation3 in 0 in 0 in Pass

4 Product footprint

1000 in2 800 in2 1242 in2 Fail(flaw)

5 Mechanical Solution (IFDS Standards)

IFDS Standards

IFDS Standards

Pass, per Appendix B of IFDS Standards

Pass

6 Time to enter seat

4 min 2 min 40 sec

Pass Pass

7 Time to exit seat 4 min 2 min 40 sec

Pass Pass

8 Force to start movement

150 N (33.7 lbs)

120 N (27 lbs)

26 lbs (2-1) Pass

Testing Results

Test #

Metric Marginal Target

Technical

Target

Test Result Pass/Fail?

9 Weight capacity 220 lbs 265 lbs 270 lbs Pass10 Comfort 3 on a 0-5

scale5 on a 0-5 scale

~4 Pass

11 Installation time 10 min 5 min 5:49 w/o purchase systemApprox 8 minutes with (speed demons)

Pass

Flaw in spec

12 Transfer Distance

40 in 50 in 39 in FailFlaw in Spec

13 Salt Chamber 12 hrs 24 hrs n/a Resource unavailable

14 Product width 20 in 18 in 22.75 Fail

Testing Results (continued)

Test #

Metric Marginal Target

Technical Target

Test Result Pass/Fail?

15 Seat accepts customer’s cushion or one is provided

W 18x18 20x20 16” cushion provided

Pass

16 Weight at a 45° angle forward to test harness

220 lbs 265 lbs 180 lbs safely

Inadequate test equipment

17 Emergency release time to activate

3 seconds 1 second < 1 second Pass

18 Rotates in final position

10° 20° > 20° Pass

19 Clamping force to maintain position

186.6 lbs 192 lbs 330 lbs Pass

Testing Results (continued)

System is overweight◦ Had to be robust due to space limitation

System is expensive System is unable to be manufactured on a

large scale in its current design Some specifications are not feasible Adjusting for multiple configurations is time

consuming

Evaluation: Success and Failure

Zeb worked on the PRP to iterate this project again in the 2014 school year

Eliminate space constraint due to Captain’s Chair Reduce weight Reduce cost More off-the-shelf parts Less machining Better corrosion resistance Re-evaluate specs Evaluate feedback on rotation – if it needs a

brake mechanism

Suggestions for Future Work

Questions, Comments?