Height adjustable foot anchoring wheel assembly

A foot anchoring wheel assembly for a frame body, comprising:

• an insert member including a plug body with an inner end and an outer end, an end piece which is connected to and covers said outer end of said plug body and which projects radially outward from said outer end of said plug body, and an engaging member projecting radially outward from said plug body adjacent said end piece so as to confine with said end piece an engaging groove that extends around said plug body;
• an anchor wheel sleeved around said insert member and including a tubular member which has an open end for entrance of said insert member and which has a varying thickness in radial directions, and an annular protrusion projecting radially inward from said tubular member adjacent to said open end to extend into said engaging groove, said annular protrusion defining an opening which is greater than the cross-section of said inner end of said insert member, but smaller than the cross-section of said engaging member;
• a foot tube adapted to be disposed at a bottom of the frame body, said foot tube being inserted between said plug body and said tubular member, said annular protrusion and said engaging groove extending between said foot tube and said end piece;
• and
• interlocking means for preventing said anchor wheel from rotating relative to said insert member, said interlocking means including at least one locking notch formed in said annular protrusion, and at least one locking piece formed on said insert member adjacent to said end piece and said engaging member for engagement with said locking notch.