Patent ID: 8011638

Claim:
A marking device comprising; an outer shell comprising a first surface with at least one relief character and a bottom surface, the first surface defining an opening, a rotatable tube comprising a tapered head comprising a second surface with at least one relief character, the rotatable tube inserted into the outer shell through its opening so that the second surface is leveled with the first surface while the tapered head sealingly contacts with an inner wall of the outer shell, an indicator comprising a tapered head with a third surface with at least one relief character and a threaded leg engaged with a threaded hole provided in the bottom surface of the outer shell, the taper head including a periphery surface configured to sealingly contact with an inner surface of the rotatable tube when the third surface is leveled with the second surface, a support mechanism configured to support the rotatable tube in the outer shell, a ratchet ring located at a bottom of the rotatable tube, and a control ball protruding from a periphery surface of the indicator, the control ball configured to engage with the ratchet ring when the indicator rotates in a first direction so that the rotatable tube rotates with the indicator and to retract into a receiving hole of the indicator when the indicator rotates in a second direction so that the rotatable tube remains stationary, wherein the support mechanism makes a periphery surface of the head of the rotatable tube apart from the inner surface of the outer shell until the third surface is leveled with the first surface.