Semi-trailer having adjustable king pin

Claim 1

A SEMI-TRAILER OF THE CHARACTER DESCRIBED, COMPRISING; (A) AN ELONGATE TRAILER BODY INCLUDING (1) A BED FRAME HAVING A CENTRALLY DISPOSED, FORWARDLY LOCATED SLOT EXTENDING LONGITUDINALLY OF SAID BED FRAME; (B) A SUPPORT PLATE SECURED TO SAID BED FRAME AND INCLUDING A PAIR OF GUIDE WAYS SECURED THERETO AND BEING DISPOSED IN PARALLEL ON OPPOSITE SIDES OF SAID SLOT; (C) A SHIFTING PLATE OVERLYING SAID SLOT HAVING ITS EDGES RECEIVED IN SAID GUIDE WAYS WHEREBY SAID PLATE MAY MOVE LONGITUDINALLY OF SAID SLOT IN SAID GUIDE WAYS; (D) A KING PIN SECURED TO SAID SHIFTING PLATE AND PROJECTING FROM ONE FACE THEREOF TO A POSITION THAT IS BENEATH SAID BED FRAME AND IN ALIGNMENT WITH SAID SLOT; (E) AN ELONGATED FRAME MEMBER (1) HAVING ITS OPPOSED ENDS SECURED TO SAID SUPPORT PLATE, AND (2) BEING ALIGNED WITH SAID SLOT AND BEING SPACED ABOVE SAID BED FRAME; (F) A GUIDE BLOCK SECURED TO SAID SHIFTING PLATE AND PROJECTING FROM THE OPPOSED FACE THEREOF TO A POSITION ABOVE SAID BED FRAME, WITH SAID GUIDE BLOCK BEING RECEIVED IN SAID SLOT AND BEING SLIDINGLY ENGAGEABLE WITH SAID ELONGATED FRAME MEMBER; (G) AND LOCKING MEANS PRECLUDING RELATIVE MOVEMENT BETWEEN SAID ELONGATED FRAME MEMBER AND SAID GUIDE BLOCK; SAID LOCKING MEANS PREVENTING MOVEMENT OF SAID SHIFTING PLATE RELATIVELY OF SAID BED FRAME.