Roller-ball paint marker

A method for assembling a roller-ball marking instrument, wherein the method comprises:

• providing a housing with a first end and a second end, wherein at least a portion of the first end of the housing is open and wherein the housing contains a reservoir;
• filling the reservoir of the housing with an amount of paint;
• coupling a first retaining ring to the housing, the first retaining ring having a body end and a roller-ball end and the body end of the first retaining ring being coupled to the first end of the housing, wherein the roller-ball end of the first retaining ring has a concave surface, forming an inverted dome-shaped center;
• positioning a fibrous, spherical roller ball in the inverted dome-shaped center of the first retaining ring;
• and
• coupling a second retaining ring to the first retaining ring at the roller-ball end of the first retaining ring, wherein the second retaining ring is configured to form an open-ended chamber with the first retaining ring and wherein at least a portion of the fibrous, spherical roller ball protrudes through a hollow center of the second retaining ring,
• wherein the first retaining ring comprises an exterior collar and an interior collar that is rotatably coupled to the exterior collar and configured to rotate from a first position to a second position relative to the exterior collar, and
• wherein the exterior collar comprises one or more openings and the interior collar comprises one or more openings configured to align with the one or more openings of the exterior collar when in the first position and configured to not align with the one or more openings of the exterior collar when in the second position.

A system for paint delivery, the system comprising:

• a paint reservoir that includes a reservoir body for storing an amount of paint;
• a fibrous, spherical roller ball adjacent to the paint reservoir for applying the amount of paint to a writing surface;
• and
• a retaining ring for coupling the roller ball to the paint reservoir, the retaining ring comprising a first end, a second end, and a center cavity holding the roller ball, wherein:
• the first end is adjacent to the reservoir;
• the second end contains an opening through which a portion of the roller ball protrudes;
• and
• the roller ball is freely rotatable within the center cavity of the retaining ring
• wherein the retaining ring comprises an exterior collar and an interior collar that is rotatably coupled to the exterior collar and configured to rotate from a first position to a second position relative to the exterior collar, and
• wherein the exterior collar comprises one or more paint openings and the interior collar comprises one or more paint openings configured to align with the one or more paint openings of the exterior collar when in the first position and configured to not align with the one or more paint openings of the exterior collar when in the second position.