Extension guide assembly for a drawer

An extension guide assembly for use on a side of a drawer to guide movement of the drawer into and out of a furniture body, said assembly comprising:

• a support rail to be attached to the furniture body;
• an extension rail to be attached to the drawer;
• a central rail between said extension rail and said support rail, said central rail having a U-shaped transverse profile opening downwardly;
• carriages positioned within said profile of said central rail and supporting rolling bodies transferring a load of the drawer from said central rail to said support rail;
• guide members disposed on top of said central rail between said central rail and said extension rail;
• said extension rail having a downwardly open U-shaped transverse cross section including an upper horizontal leg above said guide members, lateral vertical legs extending downwardly from opposite sides of said upper horizontal leg along respective sides of said guide members, and a lower horizontal leg extending from one said vertical leg to a position beneath each said guide member, thus preventing lifting of said extension rail and the drawer from said guide members and said central rail;
• a pin on said extension rail;
• and
• a pivot member mounted on said central rail to pivot in opposite directions and biased by a spring to pivot, said pivot member having a slot receiving said pin in one direction of pivoting of said pin member, thereby preventing longitudinal movement of said extension rail relative to said central rail in said one direction of pivoting of said pivot member, said slot releasing said pin member in an opposite direction of pivoting of said pivot member, thereby allowing longitudinal movement of said extension rail relative to said central rail in said opposite direction of pivoting of said pivot member.