EDSGN 100 Introduction to Engineering Design Section 0, Team #1 Folding Shopping Cart http://www.personal.psu.edu/jzb31/edsgn100_su16_section0_team1_dp1.pdf Submitted by: Jacob Barclay, Abhishek Ganta, Thomas Tracey Submitted to: Xinli Wu Date July 7, 016
FIG. 1. Prototype Abstract In order to assist shoppers as they shop and transport their items home, an easy to use, spacious, and durable cart will be constructed. The design will allow shoppers to fold their cart two ways, providing a spacious capacity, a sturdy design for a durable cart, and it will be able to be easily manipulated. The cart makes it easier to shop at stores, and transport items home with ease.
Table of Contents Cover Page Jake Barclay jzb31@psu.edu Abstract Thomas Tracey tqt5196@psu.edu Introduction Abhi Ganta awg5357@psu.edu Description of the Design Task Problem Statement Jake Barclay Mission Statement Thomas Tracey Design Specifications Thomas Tracey Design Approach Project Management - Gantt Chart Abhi Ganta Customer Needs Assessment Thomas Tracey Concept Generation Team Design Selection Matrices Abhi Ganta Final Design and its Prototype Working Drawings Jake Barclay Prototype Scale Jake Barclay Design Features Jake Barclay Operation Instructions Jake Barclay Engineering Analysis Working Mechanism Thomas Tracey Cost Analysis Jake Barclay Summary and Conclusion Thomas Tracey
Introduction: In Engineering Design 100, students were put into groups of four, and were assigned to design a foldable cart that fits within the following specifications. The cart must hold up to and including 100 pounds, be cheap costing a maximum of $50.00, have a large storage space, and be easily foldable. Using a customer needs assessment, the team surveyed people who shop with their own carts. People who live very near the stores they shop at were surveyed. Through the responses to the questions, a cart was engineered so it would be beneficial to the ordinary customer by finding available technologies to further improve by adding some modifications that reach the specifications. Description of Design Task Problem Statement: With an ever growing population density, parking spaces in urban environments are scarce and expensive. Consumers now have the difficult task of lugging groceries and other shopping items long distances to their home. People who don t have cars or have to walk an extended distance have to carry their groceries or other items by hand. Mission Statement: The objective is to provide an easier way for shoppers to shop, and transport their items home. For the product to appease the customers, the prototype will be able to be manipulated
smoothly, simply, and safely. For the client s satisfaction, the cart must also be able to stabilize weight up to and including one-hundred pounds at an affordable price. Design Specifications: An easy to use and assemble shopping cart. A shopping cart ideal for the transportation of groceries and other goods. A shopping cart that will fold effectively into a compatible form. A shopping cart whose cost should not exceed fifty dollars, unless it can be justified by the designers. A shopping cart whose weight can support up to and including one hundred pounds. Design Approach Project Management Gantt chart:
Customer Needs Assessment: For Engineering Design 100 class, a foldable shopping cart will be built. In order to satisfy the basic needs of a customer who uses foldable shopping carts, please fill out this survey and give honest answers. The answers will play a key role in the design and development of the folding shopping cart that will be built. Thank you for your time in taking this survey! 1. How frequently do you shop?. How do you transport your items home? 3. How far away do you live from the stores you usually shop? 4. Would it be beneficial to you to have a shopping cart that could go upstairs? For the remaining portion of the survey, please write a number from 1-5 describing how important you consider the quality or feature and its importance to a shopping cart (1 is not important, 5 is very important). 5. Spaciousness 6. Durability 7. Ease of use 8. Ability to be folded 9. Affordability 10. Weight of the cart itself 11. Can go upstairs
Customer Needs Assessment Results: 1.. How do you transport your items home? Walking 6% Other 0% Public Transportation (Bus or Train) 17% Car 57%
3. How far away do you live from the stores you usually shop? More than 5 Miles 6% 0-1 Miles 9% 1.01- Miles 17% 3.01-5 Miles 6%.01-3 Miles % 4. Would it be beneficial to you to have a shopping cart that could go upstairs? No 57% Yes 43% 5. Spaciousness - Importance to Consumer 1 10 8 6 4 0 10 7 4 0 1 3 4 5
6. Durability - Importance to Consumer 10 8 9 6 4 0 4 4 4 1 3 4 5 7. Ease of Use - Importance to Consumer 18 16 14 1 10 8 6 4 0 0 1 3 4 5 17 8. Ability to be Folded - Importance to Consumer 1 10 11 8 6 4 0 4 4 1 3 4 5
9. Affordability - Importance to Consumer 1 10 8 10 6 4 5 5 0 1 1 3 4 5 10. Weight of the Cart Itself - Importance to the Consumer 9 8 7 6 5 4 3 1 0 8 8 5 1 1 1 3 4 5 11. Can go Upstairs - Importance to the Consumer 14 1 10 8 6 4 0 1 5 4 0 1 3 4 5
1. Easily Storable - Importance to the Consumer 10 9 8 7 6 5 4 3 1 0 9 8 3 3 0 1 3 4 5 Customer Needs Assessment Analysis: With the customers surveyed, it can be determined which attributes are most important to the client, and which features are not important to the customers. Ease of use, spaciousness, and durability are the three most important features to those
surveyed. These attributes will be the top priority while designing the shopping cart and prototype. The cart s affordability and ability to be stored are also important to the clients, but not most important. These two features will have an impact on the design, but not as much as the top three most important attributes. The cart s foldability, ability to go upstairs, and the cart s overall weight are the least important features to the customers, and will have a minimal effect on the design. The cart must be able to accommodate those drive to the stores they shop at, and those who walk and use public transportation too. Concept Generation Jacob Barclay Back-pack
Fig 3.1 Abhishek Ganta Chinese Fan FIG 3. Thomas Tracey Traditional
FIG 3.3 Circular FIG 3.4
Design Matrices General Selection criteria Circular Traditional Backpack Chinese Fan Ease of use 1 1 1 0 Ease of storage (spacious) 1 1 1 1 Trans. Grocery & other materials 0 0 1 1 Durability 0 1 1 1 Weight 1 0 1 1 Cost efficient 1 0 0 0 Safe to use 0 1 1 1 Sum + 4 4 6 5 Sum 0 3 3 1 Sum - 0 0 0 0 Net score 4 4 6 5 Rank 3 3 1 Continue? no no yes yes FIG 4.1 design matrix Design Matrices weighted scale Backpack Chinese Fan Traditional Circular Selection Criteria Weight Rating Weighted score Rating Weighted score Rating Weighted score Rating Weighted score Ease of use 10% 4 0.4 3 0.3 3 0.3 0. Ease of storage 0% 3 0.6 3 0.6 4 0.8 3 0.6 Trans. Grocery 5% 5 1.5 4 1 3 0.75 3 0.75 Durability 10% 5 0.5 4 0.4 3 0.3 0.
Weight 0% 4 0.8 3 0.6 0.4 3 0.6 Safty 10% 4 0.4 3 0.3 3 0.3 0. Cost efficient 5% 3 0.15 3 0.15 3 0.15 0.1 Total score 100% 4.1 3.35 3.65 Rank 1 3 4 Continue? Yes No No No FIG 4. design matrix Working drawings for final design
FIG 5.1 Assembly Detail drawings
Front wheel casing FIG 5. Front Wheel Casing
Rear wheel casing FIG 5.3 Rear wheel casing
Base component FIG 5.4 base component
FIG 6.1 prototype front view (3/4:1 scale)
FIG 6. Prototype top view
FIG 6.3 prototype side view Design features: Adjustable handles for customer comfort Durable structure capable of moving heavy items with ease Collapsed state makes for easy storing with limited footprint Tri-wheel design aides in vertical transition
Operational instructions: 1. Hold the either side of the handles while pulling unattached top portion of bottom platform down as illustrated in figure 1. Lift exterior side out of bottom platform and place into the upright position as illustrated in figure 3. Adjust handles via cotter pins on either side of frame as illustrated in figure 3 4. To move cart, either push or pull according to preference. Once finished using cart, perform steps in reverse starting at. Working Mechanism: The cart is foldable two ways in order to allow the greatest spacious capacity as possible, and for easy storage. The use of canvas will allow the space where the items go to fold inward the two sets of three wheels allow the cart to transport easily up the stairs, and on a flat surface. The adjustable handlebars on the mechanism allow the cart to accommodate shoppers of any height. Cost Analysis Cost assessment Product Description Price $ Quantity Subtotal $ 6 x 1.5 rubber wheel $.5 7 $17.64 Burlap Material $.14/ft. 10 $1.40 1/8 Polypropylene (sheet) $1.7/ft. 4 $6.80 ¾ ASTM aluminum round tube $1./ft. 0 $.80 ½ ASTM aluminum round tube $.3/ft. 4 $.9 ½ x bolt with nut $1.1 8 $8.96 1/8 aluminum rivet $.05 30 $1.50
1/8 cotter pin $1.45 $.90 Total $6.00 0% discount for buying material in bulk $1.40 Subtotal $49.60 Conclusion: A foldable shopping cart was successfully constructed by the members of Team 1. The design met the requests the customers made in the customer needs assessment through building a cart primarily easy to use, spacious, and durable. The cart a wheel in the front as well as two sets of tri-wheels which allows an individual to take the cart up the stairs, and for easy use. The shopping cart folds two ways, which allows for a spacious section and easy storage after use. It is produced with an overall sturdy, and durable design. The design is foldable, and it successfully meets the desired specifications of the individuals surveyed.