Team Up Chris Jacobs Ed Fleiss Phillip Nichols Josh Marcy Mark Zoller Post Midterm Presentation

LAST WEEK There was a general understanding of the concept Many questions asked

Questions Continued: Q: Does the cart block the entrance at the top of the stairs? A: No, the cart will be pulled far enough into the attic to give a person room to safely enter the attic. Q: Can the ladder still fold into the attic after the system is installed? A: Yes, the entire system is retracted out of the entire space of the original ladder system.

Questions Continued: Q: Can the attic ladder support this load? A: Attic ladders are typically rated for at least 250 pounds. The cart should weigh less than 30 pounds, plus a maximum load of 100 pounds, which totals only 130 pounds.

Questions Continued: Q: What ladders can this system adapt to? A: The width of the cart can be adjusted so that the wheels will fit on any attic ladder with a width between 14 and 24 inches.

Questions Continued: Q: Is it true that of all people who fall from a height of 11 feet, 50% die? A: Yes. Reference: C.S. White, and I.G. Bowen, Comparative Effects Data of Biological Interest, Lovelace Foundation for Medical Education and Research, Albuquerque, N.M. Apr. 1959

Questions Continued: Q: Can the cart lower a load from the attic? A: Yes, once the cart is loaded in the attic, The cart must be pulled to the top of the ladder, ensuring the wheels are aligned correctly on the ladder. Q: Is there a safety mechanism in case of failure? A: The motor used will come with features that allow it to sense a quick change in resistance and lock if the cable or cart is caught or slips. (much like a garage door opener)

NEXT WEEK Critical Analysis of the Design Determine the areas that are most likely to fail first Power consumption Strength of materials Human interface Tolerances