Vehicle service rack

Claim 1

IN A VEHICLE SERVICE RACK, IN COMBINATION: RAISED VEHICLE FRONT WHEEL SUPPORTING CARRIAGES; INCLINED VEHICLE REAR WHEEL SUPPORTING RUNWAYS; MEANS SUPPORTING FIRST ENDS OF SAID RUNWAYS SUBSTANTIALLY AT THE ELEVATION OF SAID RAISED CARRIAGES; REMOVABLE RUNWAY BRIDGES CONNECTING SAID FIRST RUNWAY ENDS AND SAID CARRIAGES; HOIST UNITS OPERABLY CONNECTED WITH SECOND ENDS OF SAID RUNWAYS TO LIFT SAID SECOND ENDS FOR LEVELLING SAID RUNWAYS AND ELEVATING THE VEHICLE THEREON; A FIRST VEHICLE WHEEL STOP ON EACH CARRIAGE REMOTE FROM SAID RUNWAY BRIDGES; A SECOND VEHICLE WHEEL STOP ON EACH CARRIAGE ADJACENT SAID RUNWAY BRIDGE, EACH OF SAID SECOND STOPS BEING MOVABLE BETWEEN POSITIONS SUBSTANTIALLY FLUSH WITH THE ADJACENT RUNWAY BRIDGES AND POSITIONS ELEVATED WITH RESPECT TO THE ADJACCENT RUNWAY BRIDGES, AND EACCH OF SAID SECOND STOPS HAVING A POSITION CONTROL ARM THEREON; A SPRING OPERATED DETENT ON EACH CARRIAGE RELEASABLY ENGAGEABLE WITH SAID POSITION CONTROL ARM TO RETAIN SAID SECOND STOPS IN ELEVATED VEHICLE WHEEL STOPPING POSITION; MOTOR MEANS ON EACH CARRIAGE ADJACENT SAID DETENTS AND OPERABLE TO EFFECT RELEASE OF SAID DETENTS FROM SAID POSITION CONTROL ARMS; MOTOR OPERATED SAFETY LOCK ELEMENTS ENGAGEABLE WITH SAID HOIST UNITS TO RELEASABLY LOCK SAID SUPPORTING RUNWAYS IN ELEVATED POSITIONS; AND A CONTROL SYSTEM INCLUDING A CONTROL BOX AND CIRCUIT CONNECTIONS BETWEEN SAID CONTROL BOX AND EACH OF SAID MOTOR MEANS AND MOTOR OPERATED SAFETY LOCKING ELEMENTS, SAID CONTROL BOX HAVING A FIRSTT ELEMENT TO ENERGIZE SAID SAFETY LOCK ELEMENTS TO RELEASE SAID HOIST UNITS FOR LOWERING SAID WHEEL SUPPORT RUNWAYS AND A SECOND ELEMENT TO ENERGIZE SAID DETENT MOTOR MEANS TO RELEASE SAID DETENTS FROM SAID POSITION CONTROL ARMS.