P13031 - Jib Transfer Bench
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Transcript of P13031 - Jib Transfer Bench
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P13031 - Jib Transfer Bench
Team Members: Mike Walsh, Nick Davis, Charley Kowalyshyn, Zeb Koch
Guides: Kate Leipold, Dr. DeBartolo
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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
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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
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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
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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
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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
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Modeled on previous baseplate
Legs are bolted through metal plate underneath
Base clamps to bilge cover
Allows adjustability – forward and backward
Baseplate
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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
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Pillow block and carriage provide linear motion on bar and track
Most expensive component in system
Heaviest component Most complex to
install
Bench
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Durable lazy susan◦ Greased bearings◦ Rigid against torque
Provides enough friction for braking, but allows easy rotation too
Lazy Susan and Seat
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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
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Mounted behind occupant. Travels the width of device
Designed to give a 3-1 advantage
Purchase System
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Purchase System
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Top of swivel stool used
Lap belt for support
Cindy’s System w/o Captain’s Chair
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System moved forward on baseplate with front handhold used
Limits space for Cindy to move
Cindy’s System w/ Captain’s Chair
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Bucket seat and 5-point harness provide support
Leg supports
Zak & Gary’s System
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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
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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)
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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)
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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
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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
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Questions, Comments?