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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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Current Products

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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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Conceptual Design

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3D Final Design

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Dimensions of Full Assembly

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View of Linkage When Door in Open Position

(Floor Would be Closed)

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Linkage Subassembly

A

B

C

DE

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Linkage Dimensions

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Floor and Tracks

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Exploded View

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Completed Assembly

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2D Scissor and Roll-Up Floor

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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 Review

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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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Final Prototype v. Design

Safety Door Position Comparison

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Disassembled Linkage

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Floor and Linkage

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Sliding Floor Transition

Front Door Closed, Floor Open Front Door Open, Floor Closed

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Linkage in Operation

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Closed and Open Floor

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Open Front Door

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Prototype Video

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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

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The Safety Lock MailboxQuestions?