Positioning means for seat structures and the like

Claim 1

POSITIONING MEANS FOR SEAT STRUCTURES AND THE LIKE COMPRISING, IN COMBINATION, TWO SPACED GUIDE TUBES, SAID TUBES BEING PARALLEL TO EACH OTHER AND EQUAL IN HEIGHT, THE UPPER END OF EACH OF SAID TUBES BEING BEVELED WITH THE LOWER EDGES THEREOF IN FACING RELATION, A CONNECTING BASE HAVING TWO SPACED APERTURES THEREIN, SAID BASE RECEIVING THE UPPER END OF EACH OF SAID TUBES IN SAID APERTURES AND BEING SECURED THERETO, SAID BASE HAVING A SLOT EXTENDING BETWEEN SAID APERTURES, TWO ELONGATED LUGS, SAID LUGS BEING SPACED APART AND PIVOTALLY MOUNTED IN OPPOSED RELATION IN SAID SLOT IN SAID BASE, A GENERALLY U-SHAPED LEAF SPRING MEMBER POSITIONED BETWEEN AND ENGAGING SAID LUGS, SAID SPRING BEING POSITIONABLE RELATIVE TO SAID LUGS TO URGE SAME INTO AND OUT OF A LOCKING POSITION, TWO SPACED POSTS TELESCOPICALLY RECEIVED WITHIN SAID TUBES, AND A LUG RESET BAR EXTENDING BETWEEN AND RIGIDLY SECURED TO SAID POSTS, EACH OF SAID POSTS HAVING A LONGITUDINALLY EXTENDING GROOVE FORMED THEREIN IN FACING RELATION WHEN JOINED BY SAID BAR, EACH OF SAID GROOVES BEING SMOOTH-FACED AND TAPERED TO THE POST SURFACE ON THE LOWER END THEREOF AND TERMINATING ABRUPTLY AT THE UPPER END AT SAID BAR, EACH OF SAID LUGS HAVING A STRAIGHT SHARP EDGE POSITIONABLE WITHIN SAID GROOVES AND IN BITING ENGAGEMENT WITH SAID SMOOTH FACES OF SAID GROOVES IN SAID POSTS TO PREVENT DOWNWARD MOVEMENT OF SAID POSTS WITH SAID TAPERED END OF SAID GROOVES ENGAGEABLE WITH SAID LUGS TO MOVE SAME FROM SAID GROOVES AND OUT OF ENGAGEMENT WITH SAID POSTS WHEN SAID POSTS ARE RAISED AND WITH SAID SPRING MEMBER ENGAGED WITH SAID LUGS AND HOLDING SAME OUT OF ENGAGEMENT WITH SAID POSTS WHILE SAID POSTS ARE LOWERED, SAID LUG RESET BAR BEING ENGAGEABLE WITH SAID LUGS TO MOVE SAME INTO SAID GROOVES AND INTO BITING ENGAGEMENT WITH SAID POSTS WHEN SAID POSTS ARE LOWERED WITH SAID SPRING MEMBER ENGAGED WITH SAID LUGS AND HOLDING SAME IN ENGAGEMENT WITH SAID POSTS.