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Sophisticated Design

Sophisticated Design. Automatic Tailgate Final Presentation December 5, 2001 Ted Akiskalos June Doan Tarek Elshazly Maggie Kim David Nimitz Sharon Ramey. Objective. To build an automatic system that will facilitate the operation of a truck tailgate. Goals and Constraints.

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Sophisticated Design

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  1. Sophisticated Design Automatic Tailgate Final Presentation December 5, 2001 Ted Akiskalos June Doan Tarek Elshazly Maggie Kim David Nimitz Sharon Ramey

  2. Objective To build an automatic system that will facilitate the operation of a truck tailgate

  3. Goals and Constraints To develop an automatic truck tailgate that is: • Cheap • Robust • Compact • Reliable • Not a major interference to truck load • Easy to use

  4. Overall Design

  5. Agenda • Part Drawings • - Locking Mechanism • - System Cover • - Bracket • Engineering Analysis • Prototype Presentation

  6. Locking Mechanism

  7. Parts (con’t.) System Cover

  8. Parts (con’t.) Bracket Front View Back View

  9. Front View 6” 2” Cable Detachable Cable Secure 1/14” Side View 2” 6” Parts Detaching Pin Spool Cable Eyelet 2” 0.4” 0.6” 1.5” 1.5” 0.5”

  10. Engineering Analysis Fy To find weight of tailgate: FT o Fx L/3 L W FT = Force required to lift the tailgate from the edge (30lb) W = Weight of the tailgate Fx & Fy are the reaction forces in the X and Y axis, respectively L= Length from hinge to end of tailgate

  11. Engineering Analysis (con’t.) To find tension in cable: Fy T 1” 45o o l Fx L/3 To find added force in x direction: L W W = Weight of the tailgate (90lb) Fx & Fy are the reaction forces in the X and Y axis, respectively T = Tension in the cable L= Length from hinge to end of tailgate l= Length from hinge to attachment point of cable

  12. Measuring the Tension in the Cable

  13. Engineering Analysis (con’t.) Motor requirements Distance connection point on tailgate travels: Work required: Spool Power required: T Torque needed: r

  14. 4” Closed tailgate D=3/8” x 17” 16” 4” x Open tailgate 20” Engineering Analysis (con’t.) Hole extension Triangle created in open position:  Motor 16” 20” To solve for hole extension, x: 90-

  15. Hole Extension

  16. Fabricating Spool

  17. Motor and Drive Mechanism Mounted on Truck

  18. Installing a Support Bracket for Spool

  19. Preliminary Cable, Pin Assembly

  20. Completed Cable, Pin Assembly

  21. Fitting the Cover to the Side of the Bed using a Template

  22. Securing the Cover

  23. A Pin used to Keep the Spring in Place

  24. Lower Limit Switch

  25. Mounting Switch under a latch

  26. Wiring a circuit

  27. Differences • Design • Operate from cab with handle • L-bracket to mount motor only • Cover for motor only • Larger spool • Use existing latch • Gravity only force • Circuit • Raised by slight angle • Momentary push button • Four pole/double throw relays • Rod holding limit switch • Possible to have tailgate half open • Prototype • Operate from existing tailgate latch • L-bracket and two straight brackets to mount motor and align spool • Cover for motor and circuit; brackets added • Smaller spool • Removed springs from latch • Spring Force • Circuit • Manual activation • Push and hold button • Single pole/double throw relays • Rubber clasp, extension holding switch • Safety feature added to prevent this

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