Patent ID: 8192211

Claim:
A retractable USB memory stick, comprising: a metal casing comprising opposing front and rear sides, a longitudinal sliding slot, a first locating hole and a second locating hole respectively extending across said longitudinal sliding slot near two distal ends of said longitudinal sliding slot, a front opening located on the front side thereof, and a hook extended from the rear side thereof and defining with the rear side an access gap; a PC board, said PC board comprising a USB plug and a memory IC board; and an insulation PC board holder slidably mounted in said metal casing, said insulation PC board holder comprising a base portion, a front extension, a recess defined in said base portion and said front extension at a bottom side for securing said PC board, a spring strip bridged on said base portion, a sliding block located on said spring strip and inserted into said sliding slot of said metal casing to guide sliding movement of said insulation PC board holder in and out of said front opening of said metal casing between a received position and an extended position, two retaining blocks protruded from two opposite lateral sides of said sliding block for selectively engaging said first locating hole or said second locating hole of said metal casing to lock said insulation PC board holder to said metal casing in one of said received position and said extended position, and a latch extended from a rear side of said base portion opposite to said front extension for stopping against said hook to close said access gap when said insulation PC board holder is moved into the inside of said metal casing and received in said received position, said latch being kept away from said hook to open said access gap when said insulation PC board holder is moved out of said received position to said extended position.