Folding travel trailer

Claim 1

A COLLAPSIBLE AND EXPANDABLE HOUSE TRAILER HAVING TWO SECTIONS IN SUPERIMPOSED EDGE ABUTTING RELATION, (A) TELSCOPING SUPPORT MEANS SECURED OPPOSEDLY BETWEEN SAID SECTIONS TO HOLD SAID SECTIONS IN SPACED APART RELATIONS, (B) MEANS ENGAGEABLE WITH SAID FIRST MEANS TO MOVE SAID SECTIONS TOWARD AND AWAY FROM EACH OTHER, (C) A PAIR OF OPPOSED END WALLS AND SIDE WALLS HINGEDLY SECURED ABOUT COPLANAR OPPOSITELY PARALLEL HORIZONTAL AXES TO THE LOWER SAID SECTION, (D) MEANS PIVOTALLY AND ROLLABLY SECURING SAID END WALLS TO SAID UPPER SECTION WHEREBY SAID WALLS ARE ADAPTED TO MOVE TOWARD AND AWAY FROM SAID LOWER SECTION IN CORRESPONDENCE WITH SIMILAR MOVEMENT OF SAID UPPER SECTION, (E) EACH SAID WALL MOVABLE FROM A GENERALLY HORIZONTAL LYING POSITION TO AN UPSTANDING GENERALLY VERTICAL POSITION, (F) UPPER ENDS OF SAID UPSTANDING SIDE WALLS AND OPPOSED PORTIONS OF SAID UPPER SECTION HAVING COOPERABLE ALIGNING MEANS INCLUDING LONGITUDINALLY EXTENDING TONGUE AND GROOVE MEMBERS EXTENDING SUBSTANTIALLY FROM END TO END OF SAID SIDE WALLS AND OPPOSED PORTIONS ADAPTED TO COOPERATE, (G) SAID TONGUE MEMBERS BEING ADAPTED TO RESIDE WITHIN SAID GROOVE OF SAID GROOVE MEMBERS WHEN THE UPPER ENDS OF SAID SIDE WALLS ABUT IN ALIGNMENT WITH CORRESPONDING PORTIONS OF SAID UPPER SECTIONS, SAID SIDE WALLS AND CORRESPONDING UPPER SECTION BEING ALIGNED THEREBY AND IN WHICH SAID TELESCOPING MEANS SECURED OPPOSEDLY BETWEEN SAID SECTIONS INCLUDE RACKS FORMED OF A SERIES OF RIGID LINKS PIVOTALLY CONNECTED AND HAVING ENDS WHICH ABUT WHEN THE LINKS ARE IN ALIGNMENT AND HAVING SPACED TEETH ON SAID LINKS, SAID TONGUE MEMBERS EXTENDING LONGITUDINALLY OF THE ENDS OF SAID SIDE WALLS.