PIPER SARATOGA R GEAR COLLAPSED DURING LNDG ROLL. PLT EXPERIENCED DIFFICULTY WITH GEAR EXTENSION PRIOR TO LNDG.

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THIS WAS AN INCIDENT CAUSED BY MECHANICAL MALFUNCTION AND THERE WAS NOT SUBSTANTIAL DAMAGE TO THE AIRPLANE AS DEFINED BY NTSB 830 AND THEREFORE THIS IS NOT A REPORTABLE ACCIDENT. THIS RPT IS BEING FILED ON THE MECHANICAL FAILURE. ON AN EXTENDED BASE TO FINAL FOR RWY 23 AT CRE (GRAND STRAND); I LOWERED THE GEAR HANDLE TO EXTEND THE GEAR. AT THIS POINT; I DID NOT HAVE 3-GREEN; SO I ATTEMPTED TO RECYCLE THE GEAR. AFTER DOING SO; I CHKED THE CIRCUIT BREAKER AND FOUND THAT IT HAD POPPED. I RESET IT AND ATTEMPTED TO CYCLE THE GEAR AGAIN; WHICH POPPED THE BREAKER AGAIN. THE GEAR IN TRANSIT LIGHT DID NOT APPEAR EITHER (ALTHOUGH; DOING AN ANNUNCIATOR TEST SHOWED THAT IT COULD BE ILLUMINATED). SINCE I WAS UNABLE TO CONFIRM THAT ALL 3 GEAR WERE DOWN AND LOCKED; I BEGAN TROUBLESHOOTING AND PERFORMED THE MANUAL GEAR EXTENSION EMER PROC. WHILE TROUBLESHOOTING; I MADE SOME PASSES BY THE TWR TO SEE IF THEY COULD DETERMINE WHETHER OR NOT THE GEAR WAS DOWN. AFTER 45 MINS OF ATTEMPTING TO EXTEND THE GEAR; ONLY THE L AND R MAIN GEAR DOWN AND LOCKED LIGHTS ILLUMINATED AND TWR RPTED THAT THE NOSE GEAR APPEARED TO BE DOWN AND THE LNDG LIGHT WAS VISIBLE. DURING THIS PERIOD; I ATTEMPTED TO SNAP-LOCK THE GEAR INTO PLACE BY YAW AND PITCH; POWERED OFF ALL NON-ESSENTIAL LIGHTING AND RADIO EQUIP IN THE ACFT AND ATTEMPTED TO RECYCLE THE GEAR. EVEN WITH THE GEAR LEVER IN THE UP POS; THERE APPEARED TO BE NO CHANGE IN GEAR POS (PREVIOUSLY LIT GEAR INDICATION LIGHTS REMAINED LIT). ON FINAL APCH (INDICATING L AND R MAINS DOWN AND LOCKED) THE TWR STILL INDICATED THAT THE LNDG LIGHT WAS VISIBLE. DURING LNDG ROLLOUT THE R GEAR FOLDED. AFTER EXITING THE ACFT AND WITH THE CHIEF A&P ON SITE; IT APPEARED THAT THE L MAIN HAD NOT LOCKED EITHER; BUT IT REMAINED EXTENDED DURING ROLLOUT.