Abstract: The present invention relates to a key structure of a keyboard for easy grease injection. The key structure comprises a top cover installed with a supporting structure, a key cap, and a link bar. The supporting structure comprises two hooks at two sides. Each hook comprises a plate structure on its top portion and a horizontal sliding slot below the plate structure. The key cap comprises two clamps installed on a bottom side of the key cap. The link bar comprises two upper ends installed in the two clamps, and two lower ends installed in the horizontal sliding slots. Each of the plate structures comprises an injection hole. The injection hole is positioned so that grease can be injected into the horizontal sliding slot below the plate structure through the injection hole so as to reduce the friction between one lower end of the link bar and the horizontal sliding slot of the hook when the lower end of the link bar slides in the horizontal sliding slot.

Abstract: The present invention provides a keyboard which can take an optional metal support for strengthening its structure. It comprises a cover plate with a plurality of vertical housings, a base plate mounted on the cover plate with a plurality of protruding pads installed under the vertical housings of the cover plate, a plurality of keys that are vertically and movably installed within the vertical housings, a membrane installed between the cover plate and the base plate comprising a plurality of switches. When any key is depressed, the underlying switch is pressed between the plunger of the key and the underlying protruding pad, and generates a corresponding sensing signal. The keyboard may also comprise a metal support installed between the cover plate and the base plate for increasing structural strength.