Abstract: An adjusting device for a screen of a computer includes a keyboard and a screen combined together with the adjusting device for adjusting the position of the screen from the keyboard and a sloping angle of the screen to the keyboard to suit to different size of a user. The device includes two support bars pivotally connected between the screen and two bottom bars fitting and movable in the bottom of the keyboard in a preset distance from the keyboard. Then the dimensions of the keyboard to sit on a table may be increased to stabilize the computer securely. Further, the angle of the screen to the keyboard can be adjusted by pivotal connection of the support bars with the screen and also with the bottom bars.

Abstract: A computer typing learning device includes a cover and a seat, and a key board combined electrically with with a screen disposed between the cover 1 and the seat. An electronic circuit board is provided under a base plate of the key board for arranging various circuits thereon for various functions to display typed letters on a exercise letter row of the screen to be compared with a reference letter row and a warning mark row to show which typed letter is wrong. The keyboard is structured as all the same as that for common computers. A solar cell module is also provided inside the cover, connected with a battery deposited in a battery chamber in the cover, and a power convert switch is fixed on the cover for selecting a power source AC or DC for the device.

Abstract: A water purifying device which includes a plurality of barrels connected one after another by means of thread engagements into an elongated tube having an inlet end and an outlet end. A number of the barrels are loaded with filtering materials such as cloth and charcoal for filtering out solids. One barrel contains an ultraviolet lamp device for destroying microorganisms, spores and the like contained in water to be purified.