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Group 5 Self-Assembling Picnic Table

Group 5 Self-Assembling Picnic Table. Group Members: Lee-Jen Chen (Andy) Shi Li (Jeff) Spencer Soloduka Kwun Fong Tse (Ken) Supervisor Alex Kalamkarov. Self-assembling Picnic Table. Objective: Design self-assembling collapsible furniture

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Group 5 Self-Assembling Picnic Table

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  1. Group 5Self-Assembling Picnic Table Group Members: Lee-Jen Chen (Andy) Shi Li (Jeff) Spencer Soloduka Kwun Fong Tse (Ken) Supervisor Alex Kalamkarov

  2. Self-assembling Picnic Table • Objective: Design self-assembling collapsible furniture • Once initiated by button, the assembly process requires no human contact • Fully functional picnic table that can be collapsed to minimized space for storage/transportation • Suitable for indoor or outdoor use • Must seat at least 4 people (100 kg each) with sufficient table space • Should be carried by one adult (< 50 lbs) • Must be safe! 1

  3. Final Solution Opened Mode Collapsed Mode 2

  4. Presentation Contents Components: Chairs Table Central Transmission Motor and Battery Control System 3

  5. The Chairs (Main Features) Torsion Spring Front Legs L-Bracket Rear Legs Prototype (Standing) Ropes Chair Surface Chair Frame Prototype (Bottom View ) 4

  6. The Chairs (Opened / Collapsed Mechanism) Collapsing Opening 5

  7. The Chairs (Stress Analysis) 220 lb Yield Strength of Steel ≈ 310 (MPa) 195/310 = 63% 6

  8. The Table • A ring is underneath the table for support and guidance. Top View Collapsed Mode Opened Mode 7

  9. The Table 8

  10. Table Pieces • Table pieces are held together using 16 pieces of fabric. Fabric Fabric Side View Table Piece Top Bottom 9

  11. Table Piece • Each table piece is made of one piece of ABS plastic and 2 aluminum support channels. • The U bar is for connection to the central shaft. 10

  12. Support Channel Stress Analysis 50lb 100lb 50lb 12’’ 6” • Under a 50lb load, the maximum stress on the aluminum channel is 210MPa (Yield strength of Aluminum alloy 6061-T6 is 270MPa). • The maximum deflection is approx. 9mm. 11

  13. Central Transmission • A set of spur gears connects the motor and the lead screw. • The screw sits on a thrust bearing. • The nut does not rotate so it moves up and down. 12

  14. Motor & Battery • 24V, 4200mAh NiMH rechargeable battery pack • 5.0A discharge rate • 24V DC gear motor, approx. 69W • 179 RPM, 23.38 in-lbs 13

  15. Motor control circuit • One-push button • Checks potentiometer connected along transmission against reference resistor (R=0 -> open, R = Rref -> closed) • 4-way switch reverses polarity of motor 14

  16. Safety control circuit • Purpose is to disable adjacent control circuit in the case that the table is loaded • Checks 4 strain gauges mounted on each chair against four reference resistors (uses strain gauges on unloaded material for temperature compensation) • Uses normally closed magnetic relay to control power to motor circuit 15

  17. Control system – System coupling 16

  18. Conclusion 17

  19. Conclusions – Results (Dimension) Opened Mode Collapsed Mode 18

  20. Conclusions – Results (Total Weight) 19

  21. Conclusions - Budget 20

  22. Conclusions – What’s next Full scale prototype • Procurement of materials and custom fabrication • Consult technicians • Design build report II • Spec. components for control system • Simulation • Determine placement on system • Assembly • Testing • Modifications/optimizing • Final Design Report • Lessons learned 21

  23. Thank You! Supervisors • Dr. Alex Kalamkarov • Shane Yates Prototype • Reg Peters • Angus MacPherson Consultation • Dr. Robert Bauer • Dr. Lukas Swan Funding • Shell Canada 22

  24. Questions? 23

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