Vehicle-blocking device

Claim 1

IN A VEHICLE-BLOCKING DEVICE: (A) A SUBSTANTIALLY RECTANGULAR-SHAPED SUPPORTING FRAME EMBEDDED IN AND ANCHORED TO A DRIVEWAY SO AS TO BE APPROXIMATELY FLUSH WITH THE SURFACE OF THE DRIVEWAY; (B) THE SUPPORTING FRAME DEFINING SPACED END MEMBERS AND SPACED SIDE MEMBERS THAT EXTEND LONGITUDINALLY AND TRANSVERSELY, RESPECTIVELY, OF THE DRIVEWAY; (C) A JOURNAL SHAFT DISPOSED ADJACENT TO ONE OF THE SIDE MEMBERS TO EXTEND TRANSVERSELY OF THE DRIVEWAY, AND BEING ROTATABLY MOUNTED IN THE LONGITUDINAL END MEMBERS FOR TURNING MOVEMENT IN EITHER DIRECTION; (D) A SWINGABLE PLATE OF SUBSTANTIALLY RECTANGULAR OUTLINE SECURED TO THE JOURNAL SHAFT FOR BEING TURNED BY AND WITH THE LATTER; (E) THE PLATE BEING MOVABLE INTO A LOWERED POSITION AND DIMENSIONED TO FORM A CONTINUOUS BRIDGING COVER OVER THE SUPPORTING FRAME, DISPOSED FLUSH WITH THE SURFACE OF THE DRIVEWAY FOR PASSAGE OF A VEHICLE WHEEL THEREOVER; (F) THE PLATE BEING SWINGABLE INTO RAISED POSITION TO PROVIDE AN ABUTMENT AGAINST WHICH THE VEHICLE WHEEL MAY ENGAGE FOR ARRESTING MOVEMENT OF THE VEHICLE; (G) AN OPERATING SHAFT HAVING AN INBOARD END REMOVABLY COUPLED TO A SELECTED END OF THE JOURNAL SHAFT, AND HAVING AN OUTBOARD END EXTENDING TO A PREDETERMINED LOCATION RELATIVE TO THE DRIVEWAY; (H) AND AN OPERATING ELEMENT SECURED TO THE OUTBOARD END OF THE OPERATING SHAFT, AND BEING OPERABLE TO TURN THIS SHAFT IN EITHER DIRECTION, WHEREBY THE SWINGABLE PLATE MAY BE RAISED AND LOWERED.