INSTRUCTOR HAS AN NMAC IN THE TFC PATTERN AT CCR. COMPLAINS THAT THIS IS A RECURRING PROB.

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TKOF RWY 32L. AT 723 FT; L TURN TO ABOUT 140 DEGS (THIS IS A CLBING L TURN). AT COMPLETION OF TURN; STUDENT ROLLED STRAIGHT TO HDG OF 140 DEGS (FOR UPWIND LEG). AT THAT MOMENT; 3 THINGS HAPPENED ALL AT THE SAME TIME: 1) IN MY WINDSHIELD SIDE AND FORWARD SIDE WINDOW WAS A V-TAILED BONANZA ACFT Y. 2) I FORCED THE CTL WHEEL OVER SHARPLY; ANNOUNCING THAT I HAD THE ACFT. 3) I RETARDED ALL PWR TO IDLE. THE BEECHCRAFT NEVER MOVED AN INCH UP; DOWN; OR SIDEWAYS. I CALLED TWR. THEY WERE VERY NON COMMITTAL. WE PASSED DIRECTLY UNDER THE BEECHCRAFT ABOUT 40 FT. THE BEECHCRAFT AT MIDFIELD STARTED HIS/HER DSCNT THROUGH THE HELI PATTERN; LANDED; AND TAXIED TO THE RAMP. I ATTEMPTED TO GET THE FULL CALL SIGN FROM THE TWR. THEY REFUSED. WHAT CONCERNS ME IS THERE WAS NO CALL BY ACFT Y THAT WE HEARD. IF THEY CALLED FOR ENTRY INTO A CLASS D; TWR NEVER INFORMED US. ACFT Y MADE STRAIGHT-IN ENTRY (NO 45 DEG) INTO OUR 90 DEG TURN TO THE L FROM RWY HDG. OUR LOW WING PA28-161 WAS 'BELLY UP' TO THE BONANZA ACFT Y. THEY HAD TO HAVE SEEN US AS WE WERE BTWN THEM AND THE RWY ON DOWNWIND; THE BONANZA WAS NOT LOOKING FOR TFC (US). MIDFIELD; THE BONANZA DSNDED INTO THE HELI PATTERN.