Corner joint for modular assemblies

In a modular assembly which includes a plurality of elongated upright and lateral rail members of generally rectangular cross-sectional shape interconnected to form an open frame defining box-like modules for supporting shelving, side wall members, doors and such like components, a locking corner joint formed at the interconnection of the end sections of the first lateral rail member disposed within its side faces in vertical planes at right angles with a second lateral rail member with its side faces in horizontal planes, and an upright rail member with its side faces in vertical planes at right angles to both of said first and second lateral rail members, the improvement therewith in the locking corner joint compromising;

• each of said first and second lateral rail members having similarly shaped first forks formed at the end sections thereof;
• said upright rail member having a second fork formed at an end section thereof and similarly shaped as the said first fork;
• each of said first and second forks having two tynes separated by a generally, centrally disposed longitudinally extending groove;
• said tynes of said first and second forks having laterally extending slots formed intermediate the ends thereof and on both lateral surfaces thereof;
• and
• said first and second forks being sized, shaped, constructed and arranged such that when said first and second lateral rail members are interconnected with said upright member as set forth herein the end sections of the groove side surfaces of the tynes of said first lateral rail member will be snugly and securely received in the respective slots of the tynes of said second lateral rail member and the end sections of the groove side surfaces of the tynes of said upright rail member will be snugly and securely received in the respective slots of the tynes of the fork of said first lateral member.