Vertically adjustable caster

13) A vertically adjustable caster comprising:

• a) a mounting bracket comprising:
• a plate configured to removably attach to the bottom surface of a structure to be supported by the vertically adjustable caster, a top surface, and a bottom surface,
• a sleeve comprising a proximal end mounted to and extending from a bottom surface of the plate, a distal end, and a sleeve axis extending between the proximal and distal ends,
• b) a stem comprising a first and second end, the first end configured to be removably and adjustably attached to the sleeve along the sleeve axis;
• and
• c) a caster wheel assembly operatively associated with the second end of the stem;
• and
• d) a vertical adjustment assembly operatively associated with the stem and configured to be accessible to a user of the caster when the caster is assembled and the mounting bracket is attached to the structure to be supported by the caster, the vertical adjustment assembly configured to adjust the displacement of the stem along the sleeve axis.

20) An adapter assembly for converting a plated caster comprising a base plate for mounting the plated caster to the structure to be supported by the caster, and caster wheel mounted to the base plate, into a vertically adjustable caster, the adapter assembly comprising:

• a) an adapter having a top surface and a bottom surface, the adapter configured to removably mate to the base plate and comprising a stem comprising a first end and a second end mounted to and extending from the top surface of the adapter;
• b) a mounting bracket comprising a plate having a top and bottom surface, the plate configured to removably attach to the bottom surface of a structure to be supported by the vertically adjustable caster, and a sleeve comprising a proximal end mounted to and extending from the bottom surface of the plate, a sleeve axis extending between the proximal and distal ends, the sleeve configured to receive the first end of the stem;
• and
• c) a vertical adjustment assembly operatively associated with the stem and fully accessible to a user of the caster when the caster is assembled and the mounting bracket is attached to the structure to be supported by the caster, the vertical adjustment assembly configured to adjust the vertical displacement of the stem along the sleeve axis.