PA28 PLT MANEUVERED TO AVOID ANOTHER ACFT ENTERING THE TFC PATTERN OF AN UNCONTROLLED ARPT.

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THERE WERE 2 AIRPLANES FLYING THE PATTERN AT LKU. MY PA28 AND A C182. BOTH AIRPLANES WERE USING THE ACTIVE RWY 9R. AS I ROTATED ANOTHER AIRPLANE CALLED FROM 4 MI N; AND ANNOUNCED HE WOULD BE SETTING UP FOR RWY 27. I CALLED THE APCHING C152; AND INFORMED THAT THERE WERE 2 PLANES CURRENTLY IN THE PATTERN USING RWY 9R. HE ACKNOWLEDGED; AND STATED HE WOULD SET UP FOR RWY 9. I TURNED DOWNWIND; AND ANNOUNCED POS AT MIDFIELD AT 1500 FT MSL; AND THEN BEGAN TO SET UP FOR THE BASE TURN. JUST AS I WAS TURNING TO LOOK R; THE APCHING C152 CAME INTO MY FIELD OF VISION FROM R TO L AT 1500 FT MSL. I WAS ON A HDG OF 270 DEGS; HE WAS ON A HDG OF 135 DEGS; AND CUTTING THE CORNER OF THE TFC PATTERN AGAINST THE PATTERN FLOW AT PATTERN ALT. I TURNED IMMEDIATELY TO THE R TO AN ABBREVIATED BASE LEG; CALLED THE ERRANT PLT; AND THEN LANDED AT LKU. WHEN I CALLED THE ERRANT PLT; I TOLD HIM THAT IT WAS WAY TOO CLOSE FOR MY COMFORT; AND HE REPLIED THAT 'HE HAD ME IN SIGHT.' I COULD NOT GET HIS TAIL NUMBER AS THEY WERE VERY SMALL; AND HE WAS NOT IDENTING HIMSELF FULLY ON THE RADIO. AFTER I LANDED; I DID GO INTO THE ARPT; AND SHARED MY EXPERIENCE WITH ONE OF THE LINEMEN. IN RETROSPECT; I SHOULD HAVE MADE A STRONGER EFFORT TO IDENT THE ERRANT PLT. IT WAS ONLY LUCK IN MY ESTIMATION THAT HELPED AVERT DISASTER. THE OTHER AIRPLANE WAS A C150 OR C152; QUITE DINGY; AND HE DID DO A COUPLE OF TKOFS AND LNDGS ON RWY 27 AFTER I PARKED. THE OTHER PLANE THAT WAS ORIGINALLY IN THE PATTERN WITH ME LEFT WHEN THE C152 SHOWED UP. THE C152 HAD NO IDEA ON HOW TO PROPERLY ENTER THE PATTERN VERTICALLY OR HORIZONTALLY.