A metallic lockable bookshelf is a rectangular piece metal device and fabricated for the main purpose of artery keeping of book, files audio and vides cassette in homes, offices and libraries etc. as well as retrieval and consultation when needed.
On starting of this project a lot of consideration was done based on the workability of such project, the consideration of material available as well as they choice of the advantages of the material later stetted including research on the regimen properties of the material with at most carefulness if such material chosed is combustible, environmental finally or Harvard an resistance to insects attack like metals instead f wood. Strenuous become the consideration to make the project quite affordable, this in the area of cost of production which was over comer by adopting certain amendment with the need to achieving the shelf in such a way that it become a modern lockable bookshelf which can contain quite number of books and files. It was felted with rollers stands and stoppers for stability at any kept point and easy movement and solidity welded
1.2 DESCRIPTION LOCKABLE BOOKSHELF OF THE MODERN
The modern lockable bookshelf as shown in fig 1.1
Was constructed using 20mm square pipe and gauge 15mm mild steel street/plate and comprises of the totting parts /components:
III. Partitions or rocks.
IV. Roller Stands
V. The doors
In everyday work, an engineer comes across certain material like steel grides. Angle non circular bars, wrought iron, Aluminum etc. which are to be used in fabrication of projects. While selecting a suite as ability t resist stress (tensile stress and comprehensive stress), strewn, elastic limit etc under the external force. It has been observed that under the influence these forces, the material is first deterred and made an the forces and their sheet along with some suitable precutting measures to determine the strength of material and to have a better quality product. As the case may be, this knowledge is very essential for an engineer to enable him design and fabricate his project.
This table below shows the value of elasticity of material under a tensile force.
Moderns of (E) in gaine gae/mm2 & km/ mm2
200 to 220
190 to 200
100 to 160
90 to 110
80 to 90
60 to 80
With this table above, the wrought iron is been selected in fabrication of our project, because it can with sand up to 190 to 200 kn /mm2 of tensile forces.
1.2.1 THE BASE / BASE TOP.
The base is made up of that sheet properly reinforced with 20mm square pope at all four rectangular sides of the rollers and stopper. The quality of this enforcement was bultress by good welding job and tilling eared out. He width is 70mm. The base top has no roller tiller (. Fig 1B)
1.2.2. THE SIDES
The side as shown in fig is of a mild steel plate sheet of gauge 20, having a height and width dimensions of 10mm and 370mm it was properly reinforced with a for (20mm) square pope after framing and bending of the sheet at an angle of go which serve a propose of safety handling. The welding of this side was done with guage 12 mild steed. Doctored to show more stability or solidity knowing fully well that it will help in carrying the locks / partitions.(fig 1 A)
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