Patent ID: 7121127

Claim:
A lock set with a quick changeability comprising: a hollow plug having an annular channel defined in an outer periphery thereof, a key hole defined through the plug, and multiple first holes in rows respectively defined in the outer periphery thereof and communicating with the key hole, wherein multiple lower pins are respectively inserted into the first holes, and a notch defined in a rear end thereof; a cylinder mounted around the plug and having a chamber axially defined therein, a slot with a bottom defined in an inner wall of the cylinder and in communication with the chamber, multiple openings in rows respectively defined in the bottom of the slot, a cutout defined in a rear end of the cylinder, and a lug formed in an outer periphery of the cylinder and having multiple second holes in rows respectively defined in the lug and in communication with the chamber and aimed to the openings wherein multiple upper pins and springs are respectively inserted into the second holes; a ring mounted around the annular channel and having an open end, and a protrusion formed in a bottom of the ring, wherein the protrusion is inserted into and mated with the cutout so that the ring can be rotated with the plug; a sliding cover mounted in the slot and having multiple orifices in rows respectively defined in the sliding cover, and an aperture defined in the sliding cover and in alignment with the orifices; and a seat mounted at the rear end of the plug.