ABSTRACT OF THE DISCLOSUREApparatus for interlocking the ends of first andsecond channel-shaped wall sections, comprising asubstantially perpendicular first tongue integral with andextending inwardly from the end of the first wall section,with a slot at the juncture therebetween. A substantiallyperpendicular second tongue is integral with and extendsinwardly from the second wall section. The second tongueis dimensioned for insertion through the aforesaid slotand it has a detent arranged to cooperate in mechanicalengagement with the first tongue, as long as the secondtongue is operatively positioned beneath and in parallelrelationship to the first wall section. A third tongue onthe first wall section holds the second tongue in itsoperative position.
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