1

PORTABLE DESK EXTENDER

GE105:Introduction to engineering design

Mohammed Alamoudi

Abdulmohsin Aldukhail

Abdulaziz Alsubaie

Abdullah Alotaibi

Mohammed Alomi

Mohammed Alswainee

PRESENT BY432100784

432104095

432100614

432104454

432100675

432107149

Supervisor: Prof. M.E.E.Abashar

Section:29779,Group1

2

PROBLEM STATEMENT

There is a lot of people in Saudi Arabia are facing problems dealing with ordinary desks “old or small desk”. So it is required to design an extender. 

3

INTRODUCTION

The Portable Classroom Desk Extender is a horizontal, flat surface object that is use to give users more working space on a typical classroom desk, whether its to increase length on the right or left side.

It is lightweight, easy to carry and use and a functional product that is made of thermoplastic or wood which comes in various colors and also with a carrying bag for transporting

4

NEED ANALYSIS

Does not occupy large space.

It should be lightweight.

Its cost should be reasonable.

High quality.

Easy to carry “portable”.

5

NEED ANALYSIS

It must have a small space to store notes and papers.

Included with a one year warranty.

The extender design should be simple and easy to use.

It should be safe and reliable.

6

OBJECTIVES

Primary objective: To design a portable desk extender.

Secondary objectives:

- Portable and easy to carry.

- Easy to use.

- Comfortable.

- Low cost.

7

OBJECTIVES TREE

Primary

To design a portable desk extender

Comfortable Low costEasy to usePortable and easy to carry

Secondary

8

CONSTRAINTS

The price should be less than 150 SR.

Weight does not exceed 19.6N (2 kg).

The width should be less than 35 cm.

The length should be less than 50 cm.

9

CRITERIA

Portable.

Safe.

Low cost.

Reliable (1 year warranty).

Has storage space for notes and papers.

Easy to carry.

Adapted to wide variety of chairs.

10

PROBLEM DEFINITION

Design a portable desk extender because people are facing problems dealing with ordinary desks. It doesn't need to occupy large space, safe and reliable, easy to carry and must be made with high quality materials. The price should be less than 150 SR, weight doesn't exceed 2Kg (19.6N) and the maximum of dimensions must be less than (35cm*50cm). Also it may have a one year warranty and can be adapted to wide variety of chairs.

11

literature

(1)

(2)(3)

12

Morphological analysis

Option 5 Option 4 Option 3 Option 2 Option 1 FEATURES

Aluminum Fiber Plastic Steel Wood Material

Several colors silver white black Wood color color

Laying down Sitting Body position

Mug circular handler

Pencil space Space to store notes and papers

extra

square rectangular circular shape

13

Morphological analysis

Design (1) : Wood, Wood color, Laying down Pencil space, square.

Design (2) : Plastic , Several colors , Sitting, Space to store notes and papers, Mug circular handler, rectangular.

Design (3) : Steel, silver , Sitting , Mug circular handler, circular.

14

Morphological analysis

score 2 3 4 5 3 rate Design (1)

330 20 30 40 150 90 total

score 4 5 4 4 4 rate Design (2)410 80 50 40 120 120 total

score 3 4 5 3 5 rate Design (3)390 60 40 50 90 150 total

The best design is design (2)

criteria

durability comfortable stability cost safety weights

20 10 10 30 30

* The rate is out of 5, 1 as worst and 5 as best.

15

Human Factors

Anthropometric Factors (Dimension):• Width: 35 cm• Length: 50cm • Thickness: 2 cm

Ergonomic Factors:• It should be made of safety material doesn’t cause any health

problem. • We have make it easy to carry to make him comfortable while using

it.

Physiological Factors:• The Extender surface should have a soft touch.

Psychological Factors :• Color of the product may have a positive affect on the consumer.

Simulation (measures in cm)

16

Mug circular handlerPlastic

Portable Hangers

Papers Storage

17

SURVEY RESULTS (4)

18

18

19

19

20

20

21

21

22

22

23

Conclusions

• We choose a design depending on the advantages for all people.

• The chosen design is easy to use, comfortable, safe, marketable, and cheap.

• This desk will serve a large portion of people who need writing and reading everywhere, some people spend three to four hours daily in Library, airport or university to reading and writing.

24

References

(1) http://www.hope.edu/academic/engineering/engs451/2006/harrison.htm

(2) http://www.ergonomique.nl/en/ergocorner-en

(3) http://assistivetech.net/search/productDisplay.php?product_id=3341

(4) https://docs.google.com/forms/d/10g9Nuxc3AiQinmSk0EFLf5xyIGC0MipvlTMoBZsuGBM/viewform