Stair-climbing wheel chair

Claim 1

A WHEEL CHAIR, COMPRISING: A SEAT PORTION; FIRST AND SECOND OPPOSED AND LATERALLY POSITIONED CARRIAGE SYSTEM MEANS, EACH SAID CARRIAGE SYSTEM MEANS BEING A WHEEL TRUCK UNIT; ELEVATOR MEANS CONNECTING EACH CARRIAGE SYSTEM MEANS TO AN ADJACENT SIDE OF SAID SEAT PORTION FOR CAUSING THE SEAT PORTION TO MOVE ELEVATIONALLY WITH RESPECT TO SAID CARRIAGE SYSTEM MEANS, OR THE SEAT PORTION TO REMAIN STATIONARY AND THE CARRIAGE SYSTEM MEANS TO MOVE ELEVATIONALLY RELATIVE TO THE CARRIAGE SYSTEM MEANS, AND MEANS FOR LOCKING SAID CARRIAGE SYSTEM MEANS IN ANY POSITION SELECTED; AND ELEVATING MEANS SEPARATE FROM SAID SYSTEM MEANS IN THE FORM OF A CARRIAGE BASE JACK SYSTEM LOCATED UNDER THE SEATING PORTION BETWEEN THE SAID FIRST AND SECOND CARRIAGE SYSTEM MEANS; AND HAVING POWER MEANS OPERABLE UNDER THE CONTROL OF A PERSON SEATED IN THE SEAT PORTION TO MOVE THE JACK SYSTEM VERTICALLY BETWEEN A FIRST STATION POSITION NEAR THE SEAT PORTION AND A SECOND STATION POSITION A DISTANCE FARTHER FROM THE SEAT PORTION, SAID ELEVATING MEANS THEREBY ADAPTED TO EXERT AN ELEVATING FORCE UPON CONTACT WITH A SUPPORT SURFACE TO GIVE STABILITY TO THE SEATING PORTION BY OPERATING IN CONJUNCTION WITH EITHER ONE OF THE CARRIAGE SYSTEMS ALONE OR INDEPENDENTLY OF EITHER CARRIAGE SYSTEM.