Vehicle running gear and body

Claim 1

IN A VEHICLE HAVING A BODY AND RUNNING GEAR, MEANS MOUNTING THE RUNNING GEAR FOR ADJUSTMENT LONGITUDINALLY OF THE BODY TO A PLURALITY OF PRESELECTED POSITIONS COMPRISING, SLIDE RAILS CARRIED BY THE VEHICLE BODY AND EXTENDING LONGITUDINALLY OF THE BODY ADJACENT EITHER SIDE, SLIDE MEMBERS CARRIED BY THE RUNNING GEAR UPON WHICH THE SLIDE RAILS ARE SLIDABLY SUPPORTED, THE BODY AND RUNNING GEAR CARRYING COMPANION MEANS FOR LOCKING THE RUNNING GEAR TO THE BODY AT EACH OF THE PRESELECTED POSITIONS INCLUDING A RETRACTABLE PIN AND A PLURALITY OF LONGITUDINALLY SPACED OPENINGS INTO WHICH THE PIN CAN SEAT, MEANS TO RETRACT THE PIN FROM THE OPENINGS, RELEASEABLE MEANS TO HOLD THE PIN RETRACTED INCLUDING A MOVABLE TRIGGER, PRESELECTOR BARS ARRANGED IN SIDE BY SIDE RELATION WITH ONE BAR BEING FIXED AND THE OTHER BEING SLIDABLE RELATIVE TO THE FIXED BAR, ONE BAR HAVING A PLURALITY OF RECESSES INTO WHICH THE TRIGGER MAY SEAT TO RELEASE THE PIN, AND THE OTHER BAR HAVING MEANS TO OCCLUDE ALL RECESSES OF THE ONE BAR EXCEPT A SELECTED RECESS TO PREVENT SEATING OF THE TRIGGER IN ANY BUT THE SELECTED RECESS, THE RECESSES IN THE SAID ONE BAR BEING SPACED FROM ONE ANOTHER A DISTANCE EQUAL TO THE SPACING BETWEEN THE OPENINGS OF THE COMPANION LOCKING MEANS, THE PRESELECTOR BARS AND TRIGGER BEING MOUNTED SO THAT THE TRIGGER WILL MOVE OVER THE BARS WHEN THE RUNNING GEAR IS SHIFTED RELATIVE TO THE BODY TO DROP INTO THE SELECTED RECESS TO PERMIT THE PIN TO SEAT IN A SELECTED OPENING TO LOCK THE RUNNING GEAR TO THE BODY.