Door operated vehicle boarding step

Claim 1

A VEHICLE BOARDING STEP EXTENSIBLE IN RESPONSE TO THE OPENING OF A VEHICLE DOOR AND RETRACTABLE IN RESPONSE TO THE CLOSING OF A VEHICLE DOOR, MEANS FOR MOUNTING SAID STEP BELOW AND GENERALLY PARALLEL TO THE FLOOR OF A VEHICLE ADJACENT A FOOR OPENING, SAID MOUNTING MEANS INCLUDING AT LEAST ONE GUIDE PASSAGE THEREIN, GUIDE MEANS RIGID WITH SAID STEP AND SLIDABLY RECEIVED WITHIN SAID GUIDE PASSAGE, CONTROL MEANS RIGID WITH SAID STEP, AND A CONTROL LINK HAVING ONE END THEREOF PIVOTALLY CONNECTED TO THE STEP CONTROL MEANS AND THE OTHER END THEREOF ADAPTED TO BE PIVOTALLY SECURED TO THE VEHICLE DOOR SO AS TO TRANSLATE A SWINGING MOVEMENT OF THE DOOR INTO A SLIDING MOVEMENT OF THE STEP, SAID CONTROL MEANS BEING ADJUSTABLE BOTH HORIZONTALLY AND VERTICALLY, SAID MOUNTING MEANS INCLUDING A STEP RECEIVING SLEEVE WITHIN WHICH THE STEP IS POSITIONED UPON A RETRACTION THEREOF, AND A PAIR OF SAID GUIDE PASSGES, SAID GUIDE PASSAGES CONSISTING OF A PAIR OF SPACED PARALLEL TUBES RIGID WITH AND EXTENDING REARWARD OF SAID SLEEVE, THE GUIDE MEANS ON THE STEP CONSISTING OF A PAIR OF ELONGATED RODS, ONE ROD TELESCOPICALLY RECEIVED WITHIN EACH TUBE, SAID MOUNTING MEANS FURTHER INCLUDING A VERTICAL EXTENDING STUD ON SAID SLEEVE NEAR THE FORWARD EDGE THEREOF, AN ELONGATED BEARING PLATE, SAID PLATE HAVING AN APERTURE THROUGH ONE END THEREOF, SAID STUD BEING RECEIVED THROUGH SAID APERTURE, AND MEANS AJUSTABLY ENGAGED WITH SAID STUD ABOVE SAID PLATE FOR EXERTING A DOWNWARD FORCE ON SAID PLATE WHEREBY A CLAMPING OF A PORTION OF THE VEHICLE BETWEN THE TOP OF THE SLEEVE AND THE BEARING PLATE CAN BE ACHIEVED.