Patent ID: 6905352

Claim:
A USB mobile disk-pen comprising: a lower pen shaft an upper pen shaft, a lower pen housing, a refill, a spring, a sheath, a USB plug and a printed circuit board (PCB); the refill is simultaneously extended into a pen opening at a lower end of the lower pen housing when being penetrated through the spring; one end of the lower pen housing is provided with a screw pillar for coordinating with a screw opening at an inner periphery of the lower pen shaft; the refill is withdrawn or extended in the lower pen shaft through compression of the spring on the refill using the lower pen shaft; the lower pen housing is provided with an internal screw thread, such that the screw pillar is detachably and threadedly secured to the lower pen shaft to permit the replacement of the refill; and the sheath is joined with the USB plug, and one end of the sheath is connected with the PCB that is penetrated into the sheath and the sheath connected with the PCB are positioned with the sheath in a shaft opening of the upper pen shaft, and another end of the sheath is disposed with an external screw thread for fastening with the internal screw thread at the lower pen housing, to permit the combining of the upper and lower pen shafts into one body.