Introduction to Engineering Design Section 202 Group: 2 Folding Shopping Cart Project
Submitted in Summer of July, 2019 Submitted to: Professor Xinli Wu Team Members:
Nico Dillman: [email protected] Terrell Barraclough: [email protected] John Dziadyk: [email protected] Colin Przepiorka: [email protected] Kyle Jenny: [email protected]
Abstract
People without a car are having issues getting groceries in an efficient manner and are expending too much energy for a simple task. In this project, we analyzed and developed an alternative to such conditions in the form of creating a foldable and portable shopping cart. This report examines the process of designing a foldable and portable shopping cart from the research stage all the way to producing a prototype for testing.
Table of Contents
1. Introduction………………………………………………………………………. 1 Terrell Barraclough 2. Description of the design task…………………………………………………… 2 - 3 - Problem Statement 2 Terrell Barraclough - Mission Statement 2 Terrell Barraclough - Design Specifications 2 John Dziadyk 3. Design approach…………………………………………………………………… 2 - 5 Project Management - Gantt Chart 2 Nico Dillman - Customer Needs Assessment 3 John Dziadyk - Concept Generation 3 - 4 Terrell Barraclough - Design Selection Matrices 5 Nico Dillman 4. The final design and its prototype…………………………………………………. 6 - 9 - Working Drawings 6 - 8 Terrell Barraclough Colin Przepiorka - Prototype Scale and Digital Images 9 Nico Dillman - Design Features 10 Colin Przepiorka - Operation Instructions 10
Colin Przepiorka
5. Engineering Analysis……………………………………………………………… 10
- Working Mechanism 10 Terrell Barraclough - Cost Analysis 11 John Dziadyk
6. Summary And Conclusions ……………………………………………………. 11 Terrell Barraclough Colin Przepiorka
Introduction
As the world moves further into the 21st century, population continues to increase at a fairly high rate. As a result, less property is available to build houses and homes. Those who are unable to find or build a home are compelled into apartment complexes. At the apartment complexes there are multiple items that make it difficult for those who live at the complexes. One of those items including transportation of groceries. The people who live in these complexes don’t want to have to jump in their car, drive one minute down the road; then have to drive one minute back and unload all the groceries and carry them all the way to their room. Instead they could have a portable shopping cart where it makes their situation much easier.
With a foldable shopping cart, those who live in complexes are able to move their items with efficiency and ease. Instead of having to take multiple trips to and from the car, with a shopping cart, the person can move their groceries in one trip. Therefore decreasing the amount of time necessary to transport items. For example, if the shopper were to use a car to go to the grocery store, it would take much more time than just simply walking. With a car you'd have to take into consideration the traffic, stop lights and maybe even people walking across the street. If you were to use the portable shopping cart you could be that person walking across the street.
As population continues to increase even more, portable shopping carts are looking like better option if wanting to be more efficient.
Description of the Design Task
Problem Statement: - People without a car are having issues with getting groceries in an efficient manner and are expending too much energy for a simple task. Mission Statement: - The mission is to create a portable grocery cart that is easily storable, can hold up to 100 pounds (groceries or other items) and does not exceed 50 dollars to construct.
Design Specifications: ● should be easy to use (and assemble, if required). ● should be ideal for transporting groceries and some other materials. ● should fold compactly for easy storage. ● The material cost should not exceed $50 unless it can be justified. ● should have a weight capacity of 100 lbs.
Design Approach
Gantt Chart
Figure 1
Figure 1 displays the team's time management throughout the design project with the use of a Gantt Chart
Customer Needs Assessment: - Overview: - Design meets specifications - folding shopping cart should be; - easy to use (and assemble, if required). - ideal for transporting groceries and some other materials. - fold compactly for easy storage. - not exceed $50 unless it can be justified - have a weight capacity of 100 lbs. - Creativity/Innovation - Working mechanism - Operation instruction are clear - Ease of operation - Safe to use - Cost efficient
Concept Generation
Base Line Cart A Cart B
Figure 2 Figure 3 Figure 4
Cart C Cart D Cart E
Figure 5 Figure 6 Figure 7
Individual Shopping Cart Idea Descriptions:
- Baseline: The baseline shopping cart we utilized within our project is presented above. This was the most commonly found idea, thus allowing us to make justifiable comparisons between our design and the baseline idea. - Concept A: The design was similar to the baseline. It the same shape and collapsing system. The difference is that there is an extension below the handles. It extends to the user can place things on it while grabbing goods. It has a hook to hold the added removable cloth bag. It would allow the user to have the option for more carrying space. Then there is an attachment that would be able to be added to the collapsed cart to transform it into a dollie. - Concept B: In this design, it was designed to be similar to a dolly. For those who are in apartments or large complexes, with this design it will be able to go up stairs and bumps. Also it will be foldable (flat like) so you can hang this shopping cart on the wall. - Concept C: This design was focused on easy use and portability. The design was chosen to include the removable baskets in order to make shopping easier and so that the cart takes up less space when not in use. - Concept D: This design encompassed the idea of backpack portability. It has straps that connect from top to bottom that keep the backpack together when the cart is not in use. It
was crucial to have collapsible baskets that would allow for the shopping cart to be compact as well as light. - Concept E: My design is similar to a suitcase so it would be more portable. It has a moving handle that can increase and decrease the height. The frame is made out of metal and everything else is made out of plastic. The basket has a handle on the top so that you can detach it when needed.
Design Selection Matrices:
Decision Matrix: Figure 8
Understanding the Decision Matrix: - The group used a basic shopping cart so that the group could compare the shopping cart to a more simple shopping car. - The group studied Concepts A - E and analyzed them based off of our selection criteria - Key - (0) = same as baseline - (+) = better than baseline - (-) = worse than baseline
Weighted Decision Matrix:
Figure 9
The Final Design and its Prototype
Rough Final Sketch of the Shopping Cart:
Figure 10
Working/Detailed Drawings:
Figure 11
Figure 12 Figure 13
Assembly Drawing:
Figure 14
Prototype Scale and Digital Images: SCALE 1:2
Figure 15 Figure 16
Figure 17 Figure 18
Design Features:
The shopping cart frame is made of aluminum and the shopping cart baskets are made out of plastic to withstand the weight of groceries. The bottom basket is made to hold larger items such as a case of water, gallons of juice, and other large grocery items. The top basket was designed to hold smaller and lighter items such as apples, lunch meat, bread, eggs, etc.
Operation Instructions:
In order to fold the shopping cart the user will disconnect the top basket by simply pulling it up and off the frame, then placing the top basket inside the smaller basket. Next the user will pull up on the handle and fold the top piece of the frame over the bottom basket. To unfold the shopping cart the user will lift the top piece of the frame up and push down to lock the handle in place. Finally the user will take the top basket out of the bottom basket and lock it in at the top piece of the frame.
Engineering Analysis
Working Mechanism:
- The group designed the shopping cart with materials and functions so that it could hold a fairly large load of groceries, light in weight and move with ease.
- In the shopping cart, at the base there are four wheels: two of them consisting a 4 inch diameter with a fixed direction, where as the front wheels have a 3 inch diameter with a 360 degree directional change. At 5 inches above the base basket, there is a fold in the aluminum so that the top basket can fit into the larger bottom basket. The baskets were designed so one basket could fit into the other ( to minimize storage space).As a result of the fold, when storing the shopping cart, the shopping cart will not take up as much space.
Cost Analysis: The shopping cart created was surprisingly under budget. It was able to create the design while meeting the criteria and only costing $40.18 of the $50.00 provided. The information below depicts the product parts and the breakdown of their prices.
- Front Wheels 3 in. diameter - 2x - $3.44 each ($6.88) Back Wheels 4 in. diameter - 2x - $6.90 each ($13.80) Aluminum Spindle ¾ in. 4x - $2.00 each ($8.00) Nuts ½”-20 - 14x - $0.07 each ($0.98) Hex Bolts Stainless Steel 18-8, ¼”-20 - 14x - $0.18 each ($2.52) Plastic Crate 15 ⅝ x 13 ¾ x 10 ⅝ in. (Base Material Bottom Basket) - $4.00 Plastic Crate 9 x7.75 x 6 in. (Base Material Top Basket) - $3.00 PVC Pipe - 3/4 x 8 in. - $0.50 Sheet Metal Screws Phillips Pan Head Stainless Steel 18-8 #2 - 10x - $0.05 each ($0.50)
Cost Analysis: Total - $40.18
Conclusion
- In conclusion, the group worked together to create a functional foldable shopping cart that meets all the criteria listed on the instructions. The team utilized the design process to come up with and create a design that was then developed into a prototype. As a result from the long process of designing the prototype, the prototype was functional. Throughout the design report, the reader can see the groups process of creating a shopping cart. This project gave the group experience on going through what a design project needs. Overall, the team was able to put their ideas and concepts together in order to come up with the best folding shopping cart design.