27 april 2005safety lock mailbox1 safety lock mailbox me 4182 - final presentation carlos alzate...
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27 April 2005 Safety Lock Mailbox 1
Safety Lock MailboxME 4182 - Final Presentation
Carlos Alzate
Brian Dorton
Song Park
Varun Sharma
Jack Vasko
Adam Zurawski
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Presentation Overview• Project Objectives and Goals• Current Products• Conceptual Design• Design Evaluation• Prototype Changes• Prototype Review• Possible Future Project Plans• Questions
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Project Objectives and Goals• Scope of the Problem
– Threat of personal information stolen– Identity theft via bills, documents, and packages
• Customer Needs– Vandalism-resistant, not vandalism-proof– Storage space large enough for small deliverable
packages– Aesthetic appearance matching neighborhood codes
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MailGuard(A Division of Neogenesis, Inc.)
MailGuard Locking Mailbox
$89.95
http://www.mailguard.net/
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The Belaire 20
• Security Mailboxes www.securitymailbox.com
• Price– Steel: $219– Black Paint: $245
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View of Linkage When Door in Open Position
(Floor Would be Closed)
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Mechanical Advantage of Floor Closing
• Mechanical Advantage exponentially decreases in last few degrees of closing
0
1
2
3
4
5
6
7
0 10 20 30 40 50 60 70 80 90
Door Rotation Angle (degrees)
F_F
loo
r
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Prototype Changes• Scissor design
– 2 point contact• Safety Door Placement
– Design – Front; Prototype - Rear• Tracks
– Design – Teflon; Prototype - Wood• Outer Shell
– Design – Steel; Prototype – Scrap Metal– Re-enforced walls
• Floor– Used available box hinge
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Sliding Floor Transition
Front Door Closed, Floor Open Front Door Open, Floor Closed
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Possible Future Plans
• Improve mechanical advantage by cutting off last few degrees of closing
• Invest in teflon tracks
• Invest in more robust steel for outer shell
• Decrease linkage thickness for greater clearance