Abstract: A detachable folding keyboard device includes a base frame unit consisted of a left base frame and a right base frame, a keyboard unit consisted of a left keyboard and a right keyboard respectively supported on the left and right base frames, connecting devices connected between the left and right frames for permitting the left and right keyboards to be end matched, or to be set apart and spread out like a fan, or to be folded up.

Abstract: A scanner base for an optical scanner, including two end plates, a contact image sensor connected between the end plates, a roller mounted between holes on the end plates and disposed in contact with the contact image sensor, and a motor drive mounted on one end plate and controlled to turn the roller, causing the roller to carry the document to be scanned over the contact image sensor for scanning.

Abstract: A detachable keyboard including a key pad, an upper frame coupled to the key pad at the bottom, an intermediate shell fastened to the upper frame at the bottom, a lower frame coupled to the intermediate shell at the bottom, a bottom shell fastened to the lower frame at the bottom, an adjusting screw, an actuating member coupled to the adjusting screw, and a lifting member having one end pivotably connected to the actuating member and an opposite end extended out of an opening on the upper frame and pivotably coupled to the key pad, wherein the intermediate frame can be moved along curved sliding grooves on the lower frame to adjust the horizontal position of the key pad; the actuating member can be moved forwards or backwards by turning the adjusting screw in either direction, causing the lifting member to lift or lower the key pad.

Abstract: An electrical connector includes a bottom shell, a cover shell covered on the bottom shell, a PC board mounted within the bottom and cover shell and having a male connector extended out of the bottom and cover shells, and two fasteners mounted on respective mounting blocks on the bottom and cover shells at two opposite sides to fasten the male connector of the PC board to a respective parallel port on the computer, wherein each fastener consists of a rotary driving roller mounted on the mounting blocks at either side and having wings for turning by hand, a bolt driven into a respective screw hole on the computer by the rotary driving roller, and a spring received in a polygonal hole on the rear end of the bolt and supported on the rotary driving roller.