Foldable Shopping Cart EDSGN 100 Section 202 Team 3 http://personal.psu.edu/jnb5392/homepage.htm Submitted by: Alex Thomason Christian Sak Jeremy Deppen Jerod Barone Submitted to: Xinli Wu 30 July 2015
Abstract Our goal for this project was to design and build a prototype of a foldable shopping cart for people without cars, or people that need to carry groceries longer distance than from a garage. This report will show the processes of the research and development of our design for the foldable shopping cart. 2
Table of Contents Introduction (cfs5124@psu.edu). 4 Description of the design task Problem statement (abt5162@psu.edu)...... 4 Mission statement (cfs5124@psu.edu)... 4 Design specifications (abt5162@psu.edu)........ 4 Design approach Project management - Gantt chart (jnb5392@psu.edu)....... 5 Customer needs assessment (cfs5124@psu.edu) (abt5162@psu.edu) 5 Concept generation...... 7 Design selection matrices (jnb5392@psu.edu)... 9 The final design and its prototype Working drawings of your final design (jnb5392@psu.edu)......10-12 Prototype scale and a digital image(s) of your prototype... 12 Design features (abt5162@psu.edu).......... 13 Operation instructions (cfs5124@psu.edu)..... 13 Engineering Analysis Working mechanism (how the designed device works)..13 Cost Analysis (jnb5392@psu.edu).. 13 Summary and conclusions (jmd6366@psu.edu)........ 13-14 Acknowledgements (jmd6366@psu.edu)..... 14 References (jmd6366@psu.edu).. 14-15 3
Introduction (Christian Sak): This report documents the steps our group took to design a folding shopping cart prototype in our Engineering Design 100 course. The shopping cart is meant to be for people without cars, or people that need to carry groceries for a large distance. We started with a basic design task and specifications, and then proceeded to evaluate costumer needs. We then generated design concepts and picked the best one based on specific needs. Our final product was a working half scale prototype. The rest of this report goes more in depth of the process. Problem Statement (Alex Thomason): The problem is that many people lack a mode or transportation in which to carry groceries and other items from one place to another. They need a storable product to aid them in carrying multiple items up stairs, in elevators, and around town. Mission Statement (Christian Sak): Our mission is to design and build a foldable shopping cart that will be useful to a wide range of customers. The foldable shopping cart should be easy to use and assemble, fold and store, buy and carry. The material cost of the cart should be under fifty dollars and have a weight capacity of at least one hundred pounds. Of course, this product must be very safe to use. Design Specifications (Alex Thomason): The folding shopping cart should be easy to use and assemble The folding shopping cart should be ideal for transporting groceries and some other materials. The folding shopping cart should fold compactly for easy storage. The material cost for the folding shopping cart should not exceed $50 unless it can be justified. The folding shopping cart should have a weight capacity of 100 lbs. 4
Gantt Chart (Jerod Barone): Customer Analysis (Alex Thomason & Christian Sak): Customer # 1: Lives in an apartment with a car 1. What problems do you experience when you carry groceries back to your home? Well, because I live in an apartment on the top floor, there are a couple stairs I have to climb before reaching an elevator. It is a pain to carry all my groceries up the stairs and hold them until I reach my apartment. Getting from the store to the parking lot of my apartment is fairly easy because I have a car. 2. What is your mode of transpiration when grocery shopping? I take my car to the store so it is easy to take them back to the apartments. It does not take me too long to shop and bring everything back. 3. If you travel by car, what is the distance from your car to your front door? If you walk, what is the distance from the store to your house? The distance from the apartments parking lot to my home is approximately 200 ft (including stairs and hallways). 4. What is the average amount of groceries that you buy? I go to the store on average two times a week. Since I have a family, I buy a approximately 45 pounds of groceries each time. Are there multiple people that you shop for? 5
I shop for my family. I have a husband and one child. Neither come with me to shop, so I have to carry all my groceries and items back to my home by myself. 5. How hard is it physically for you to buy and carry groceries back to your home? On a scale from one to ten, I would rate my difficulty as a four. Like I said, walking through the apartment complex with everything can be tedious. I often have to make multiple trips. Customer # 2: Lives in a city without a car 1. What problems do you experience when you carry groceries back to your home? City streets, bumps, edges, crowded people bumping into me. 2. What is your mode of transpiration when grocery shopping? Walking down the street, possibly brought onto public transportation such as a bus or subway. 3. If you travel by car, what is the distance from your car to your front door? If you walk, what is the distance from the store to your house? I walk far to the store; it is multiple blocks away from my home. 4. What is the average amount of groceries that you buy? I buy a pretty large amount weekly; I go multiple times a week so the load isn t too bad coming back to my home. 5. Are there multiple people that you shop for? I shop only for myself. 6. How hard is it physically for you to buy and carry groceries back to your home? It takes a lot of effort to bring all my groceries down the streets to my home. Crossing streets, going through public transportation, and walking up and down occasional stairs is very tiring and tedious. 6
Concept Generation: Figure No. 1 Cart: A (Alex Thomason) Figure No. 2: Cart B (Alex Thomason) 7
Figure No. 3: Cart C (Jerod Barone) Figure No. 4: Cart D (Jeremy Deppen) 8
Figure No. 5: Cart E (Christian Sak) Design Matrices (Jerod & Team): Table 1. Design Matrix Table 2. Design Matrix Weighted 9
Working Drawings (Jerod Barone): Figure No. 6: Solid Model of Cart (Jerod Barone) Figure No. 7: Cart Platform 10
Figure No. 8: Wheel Figure No. 9: Top Half of Pole 11
Figure No. 10: Assembly Drawing Scale (Prototype to Real Size): 1:2 Figure No. 11 Figure No. 12 Figure No. 13 12
Design Features (Alex Thomason): There are many features of this product that make it convenient and easy to use. There are four wheels to make the cart very stable and maneuverable. Additionally the locking mechanisms on the base and staff enable the user to tilt the cart on two wheels if necessary. The Velcro on the platform ensures that the bag will not slide off the cart, while the hooks below the handles enable the canvas bag to hang in an ideal position to place groceries. Groceries can also be carried up stairs with the detachable bag. The thin yet strong plastic platform allows at least 100 pounds of groceries to be loaded into the cart. Round handles were also installed to provide comfort to the users while rolling the cart. When the shopping cart needs to be stored, it easily folds down and fits in compact places. Operation Instructions (Christian Sak): The benefit of the folding design of this cart is that it can be pre-assembled in the box. The cart will be in the folded position, so all the customer has to do is extend the pole upwards until it clicks into place. The bag is included with the cart. When placing the bag on the cart, attach the Velcro on the bottom of the bag to the base of the cart. Then, hang the bag by its handles on the hooks at the top of the pole, right below the handle. When the customer is finished using the cart they just take the bag off the cart by simply separating the Velcro. Then, push the pole back into the folded position. Working Mechanism (Jerod Barone): How this cart folds up is simple. The pole is equipped with hinges that allow it to fold in half and down onto the platform. Also the hinges will lock in place when the pole is extended so that the cart does not collapse during usage. Cost Analysis (Jerod Barone): The total material cost of this cart turned out to be $54.51. We figured out that finding cheap parts for the cart was not easy, so we searched for the cheapest parts we could find and ended up with this cost. If we would sell an actual final product of the cart, we would sell it for $84.99. This would give us at least a 60% profit margin, which is reasonable in this case because this cart is expensive for us to build. Summary (Jeremy Deppen): Storage and portability has become an increasing problem to the typical store goer using a shopping cart as cities become bigger, apartments become smaller, and people need to walk further to obtain their store bought goods. With this, arises a need for durable, cost efficient, and easy to use shopping cart. When tasked with designing such shopping cart, we needed to take into account the needs of a typical consumer, so we asked two people about the factors that are involved in their shopping trip such as: length 13
from store to car or store to place of residence, whether or not stairs are involved, etc. The foldable cart that we designed and built can hold at least 100lbs, has a platform at the bottom to store large items such as a case of water, can fold and store in small areas, includes a detachable bag that makes transportation up stairs easy, and costs just over $50 to produce. Our design of a flat base on wheels, square rod protruding upwards, and handles that hold the bag in place is a simple yet effective way to get your groceries/goods from point A to point B while being able to fold up for easy storage. Acknowledgements (Jeremy Deppen): We would like to thank Xinli Wu for his guidance over the duration of the project as well as Nick Petrunyak for staying for evening hours and monitoring the workshop where we built our prototype. References (Jerod Barone): High Density Polyethylene (HDPE) Sheeting U.S. Plastic Corp. (n.d.). Retrieved July 16, 2015, from http://www.usplastic.com/catalog/item.aspx?itemid=23869&catid=705 1/16" x 24" x 48" HDPE Sheet McMaster-Carr. (n.d.). Retrieved July 16, 2015, from http://www.mcmaster.com/#standard-plastic-rods/=y18dvm After you go to the link, click on Chemical Resistant PVC. McMaster-Carr. (n.d.). Retrieved July 16, 2015, from http://www.mcmaster.com/#canvas/=y18ck5 Water Repellent sheeting McMaster-Carr. (n.d.). Retrieved July 16, 2015, from http://www.mcmaster.com/#straphinges/=y2rvfb Two Style 7 hinges: 1 7/8" x 7/8" x 9/16" x 1 13/16" McMaster-Carr. (n.d.). Retrieved July 16, 2015, from http://www.mcmaster.com/#pvc- 14
square-tubing/=y2s2r3 3/4" x 3/4" Reliable Hardware Company RH-5134BO-A 3/4-Inch Black Oxide Wood Screw and Wax. (n.d.). Retrieved July 16, 2015, from http://www.amazon.com/reliable- Hardware-Company-RH-5134BO-A-4- Inch/dp/B00JJ18VKC/ref=pd_sim_267_1?ie=UTF8&refRID=15H363RJNTJ1N 770AFB7 Reliable Hardware Company RH-9005-SET-A Casters Swivel Top Plate 2-Inch Wheel Diameter Zinc, Set of 4. (n.d.). Retrieved July 16, 2015, from http://www.amazon.com/reliable-hardware-company-rh-9005-set-a- Diameter/dp/B00JJ18VIE/ref=pd_bxgy_267_img_y Velcro Combo Strips Pack - 3 4" x 15', Black. (n.d.). Retrieved July 16, 2015, from http://www.uline.com/product/detail/s-5750/velcro-hook-and-loop- Tape/Velcro-Combo-Strips-Pack-3-4-x-15- Black?pricode=WY855&gadtype=pla&id=S- 5750&gclid=Cj0KEQjww42tBRCOsfEiO3DvYMBEiQAHeqMKHAsZHDC_XfgMZkVDmqBXqeUUbHl_AHflloH GrasMqcaAuov8P8HAQ&gclsrc=aw.ds APA formatting by BibMe.org. 15