Roller mechanism for a sliding door

A roller mechanism for a sliding door of the type having a door panel, a rectangular frame with rigid bottom, top and side members, and a lower track for receiving a roller, the roller mechanism comprising:

• (i) a rigid bracket member to attach said roller mechanism to said sliding door;
• (ii) a roller housing containing a roller, said roller housing being vertically adjustable within said bracket member, said roller being receivable within said lower track and facilitating the sliding movement of said door;
• and,
• (iii) lower track engaging means, said engaging means being releasably retained within said lower track and comprising a pair of leading and a pair of following track retainers, one of said leading and one of said following track retainers being rigid and capable of supporting said sliding door when said roller is removed from said lower track, the other of said leading and of said following track retainers being flexibly resilient such that they may be displaced to allow for the insertion and removal of said lower track engaging means into and out of said lower track.