Transportable Classroom Table and Chair

1 -Ahmed alshamrani

2 -Mansour alrumayh

3 -Abdulrahman alqadi

4-Ali alqadi

5-Mohannad alnufaie

6-Ahmed alobidy

Supervised byDr.Mohammad Abshar.

Group 2

2Introduction

Every day we live in , we use many things that we actually we cant take it off our lives , In order to make life easier and healthful, we came out of an idea which is making chairs able to be transported from place to another in an easy and simple way regarding to its

use in our lives .

3Problem Statement

Current chairs are heavy and not transportable. Also, sometimes they don’t have a table.So,we will try to solve these problems by designing a light and transportable chair with attached table.

4Need Analysis

-Table and chair-Transportable

-Light-Made off high quality materials

-Comfortable-The table can be extended

-Storage

5Main Objective

-To design a transportable chair and table that can be combined together.

6Secondary Objectives

-To be built by a high quality materials-The ability to store things

-To be comfortable-Table extender

7Objectives tree

design a transportable chair and table

high quality materials

Ability to store things

Table extender

Comfortable

8Constraints

-Maximum cost 500 SR-Maximum mass of 5 kg ( 49.05 N)

-Maximum load of 120 kg (1177.2 N)

9Criteria

-Safe-Easy to use-Comfortable

-transportable -light.

10Problem definition

Design a separate and transportable classroom chair and table that can be combined together . Their mass limit should be 5 kg and the load shouldn’t exceed 120 kg (1177.2 N) .They should be made of high quality material .The chair must be comfortable and safe.The table is able to extend. The chair must have storage, also

wheels to make it transportable .

11Existed designs

Pros:-Light - Transportable

Cons:-Can’t handle heavy weight

-Doesn’t have a table.-Can’t adjust height.

-Uncomfortable. [1]

12Existed designs

Pros:-Comfortable. -Has a table.

-Can hold heavy weight.

Cons:-Too heavy . -Not transportable.

-Doesn’t have a storage. [2]

13Morphological Analysis

Features Possible Concept

Type of material Aluminum , Steel , Magnesium

Ground Supports Wheels , Fixed.

Adjusting height Hydraulic , Pin , None

14Designs Concepts.

Design (1) : Steel , Fixed , Hydraulic.

Design (2): Aluminum , Wheels , Pin

Design (3): Magnesium , Wheels , None

15Criteria and weights

Criteria Weight

Easy to use 10

Light 25

Transportability 30

Safety 20

Comfortable 15

Total 100

16Weight and Rate

Criteria

Score

Comfortable

Transportability

Light Easy to use

Safety

15 30 25 10 20 Weight

Concepts (designs)

10 5 5 8 5 Rate Design (1)

695 150 150 125 80 100 Total

8 8 8 5 8 Rate Design (2)

770 120 240 200 50 160 Total

7 10 10 10 10 Rate Design (3)

955 105 300 250 100 200 totalHence , the best design is design (3).

10 for the best …1 for the worst.

17Materials Properties

NAME

Density(g/

cm³)

Tensile strength

(MPa)

Yield strength

(MPa)

Elongation

(%)

Specific strengt

h

Young’s modulus

(GPa)

Magnesium alloy

AZ91 1.82 280 160 8 154 45

AZ31B 1.77 260 200 15 147 44.8

Aluminum alloy 380 2.70 315 160 3 117 71

Steelcarbo

n steel

7.86 517 400 22 66 200[3]

18Cost Analysis

Chair mass = = 1.5 Kg

Desk mass = = 3.03 Kg

Desk cost = 3.03 = 131 SR

Total mass = 4.53 Kg

Total cost = 180.5 SR

Sheet alloy costs (11.00 Dollar/Kg) and Extrude alloy costs (8.8 Dollar/Kg)[4]

Human Factors

20Anthropometric Factors

All dimensions in inches

[5]

21Ergonomic Factors

-The table should have easily input and output method.

-The way of opening and closing the chair should be hard and tough.

-The easiness of moving it along places.

22Physiological Factors

[6]

23Psychological Factors

It should have many different colors to make it comfortable for the eyes.

24Simulation

25Conclusion

The design will be made of magnesium which makes it light and safe as well . Also, it will be supported by wheels that increase its transportability . However, the table would be attached to the chair by clicking it on the chair. In addition, it will have fixed height that makes it easy to use. Its height,

length and width will be 36,15 and 15 inches respectively .

26References

[1]:http://www.exhib-it.com/trade-show-furniture

[2:]://http . . / / - - .www wengercorp com chairs portable audience chairs php

[3 :]://http . . . / / _ / _ _ / _ _ .www jsw co jp en mg f mg mg f mg mg chare htm

[4 :]W. D.Callister, Jr, “Materials Science and Engineering an Introduction", seventh edition, John wiley,2007,pp: A33.

[5 : ]://http. . / / /2010-07-15-08-16-206.www chaircoverchair com pic other jpg

[6 :]:// . . / / - .http www smartfurniture com products Leap Chair html

27

Thank you for listening .